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1/*
2 * libata-scsi.c - helper library for ATA
3 *
4 * Maintained by: Tejun Heo <tj@kernel.org>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available from
31 * - http://www.t10.org/
32 * - http://www.t13.org/
33 *
34 */
35
36#include <linux/slab.h>
37#include <linux/kernel.h>
38#include <linux/blkdev.h>
39#include <linux/spinlock.h>
40#include <linux/export.h>
41#include <scsi/scsi.h>
42#include <scsi/scsi_host.h>
43#include <scsi/scsi_cmnd.h>
44#include <scsi/scsi_eh.h>
45#include <scsi/scsi_device.h>
46#include <scsi/scsi_tcq.h>
47#include <scsi/scsi_transport.h>
48#include <linux/libata.h>
49#include <linux/hdreg.h>
50#include <linux/uaccess.h>
51#include <linux/suspend.h>
52#include <asm/unaligned.h>
53
54#include "libata.h"
55#include "libata-transport.h"
56
57#define ATA_SCSI_RBUF_SIZE 4096
58
59static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
60static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
61
62typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
63
64static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
65 const struct scsi_device *scsidev);
66static struct ata_device *ata_scsi_find_dev(struct ata_port *ap,
67 const struct scsi_device *scsidev);
68
69#define RW_RECOVERY_MPAGE 0x1
70#define RW_RECOVERY_MPAGE_LEN 12
71#define CACHE_MPAGE 0x8
72#define CACHE_MPAGE_LEN 20
73#define CONTROL_MPAGE 0xa
74#define CONTROL_MPAGE_LEN 12
75#define ALL_MPAGES 0x3f
76#define ALL_SUB_MPAGES 0xff
77
78
79static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
80 RW_RECOVERY_MPAGE,
81 RW_RECOVERY_MPAGE_LEN - 2,
82 (1 << 7), /* AWRE */
83 0, /* read retry count */
84 0, 0, 0, 0,
85 0, /* write retry count */
86 0, 0, 0
87};
88
89static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
90 CACHE_MPAGE,
91 CACHE_MPAGE_LEN - 2,
92 0, /* contains WCE, needs to be 0 for logic */
93 0, 0, 0, 0, 0, 0, 0, 0, 0,
94 0, /* contains DRA, needs to be 0 for logic */
95 0, 0, 0, 0, 0, 0, 0
96};
97
98static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
99 CONTROL_MPAGE,
100 CONTROL_MPAGE_LEN - 2,
101 2, /* DSENSE=0, GLTSD=1 */
102 0, /* [QAM+QERR may be 1, see 05-359r1] */
103 0, 0, 0, 0, 0xff, 0xff,
104 0, 30 /* extended self test time, see 05-359r1 */
105};
106
107static const char *ata_lpm_policy_names[] = {
108 [ATA_LPM_UNKNOWN] = "max_performance",
109 [ATA_LPM_MAX_POWER] = "max_performance",
110 [ATA_LPM_MED_POWER] = "medium_power",
111 [ATA_LPM_MIN_POWER] = "min_power",
112};
113
114static ssize_t ata_scsi_lpm_store(struct device *device,
115 struct device_attribute *attr,
116 const char *buf, size_t count)
117{
118 struct Scsi_Host *shost = class_to_shost(device);
119 struct ata_port *ap = ata_shost_to_port(shost);
120 struct ata_link *link;
121 struct ata_device *dev;
122 enum ata_lpm_policy policy;
123 unsigned long flags;
124
125 /* UNKNOWN is internal state, iterate from MAX_POWER */
126 for (policy = ATA_LPM_MAX_POWER;
127 policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
128 const char *name = ata_lpm_policy_names[policy];
129
130 if (strncmp(name, buf, strlen(name)) == 0)
131 break;
132 }
133 if (policy == ARRAY_SIZE(ata_lpm_policy_names))
134 return -EINVAL;
135
136 spin_lock_irqsave(ap->lock, flags);
137
138 ata_for_each_link(link, ap, EDGE) {
139 ata_for_each_dev(dev, &ap->link, ENABLED) {
140 if (dev->horkage & ATA_HORKAGE_NOLPM) {
141 count = -EOPNOTSUPP;
142 goto out_unlock;
143 }
144 }
145 }
146
147 ap->target_lpm_policy = policy;
148 ata_port_schedule_eh(ap);
149out_unlock:
150 spin_unlock_irqrestore(ap->lock, flags);
151 return count;
152}
153
154static ssize_t ata_scsi_lpm_show(struct device *dev,
155 struct device_attribute *attr, char *buf)
156{
157 struct Scsi_Host *shost = class_to_shost(dev);
158 struct ata_port *ap = ata_shost_to_port(shost);
159
160 if (ap->target_lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
161 return -EINVAL;
162
163 return snprintf(buf, PAGE_SIZE, "%s\n",
164 ata_lpm_policy_names[ap->target_lpm_policy]);
165}
166DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
167 ata_scsi_lpm_show, ata_scsi_lpm_store);
168EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
169
170static ssize_t ata_scsi_park_show(struct device *device,
171 struct device_attribute *attr, char *buf)
172{
173 struct scsi_device *sdev = to_scsi_device(device);
174 struct ata_port *ap;
175 struct ata_link *link;
176 struct ata_device *dev;
177 unsigned long now;
178 unsigned int uninitialized_var(msecs);
179 int rc = 0;
180
181 ap = ata_shost_to_port(sdev->host);
182
183 spin_lock_irq(ap->lock);
184 dev = ata_scsi_find_dev(ap, sdev);
185 if (!dev) {
186 rc = -ENODEV;
187 goto unlock;
188 }
189 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
190 rc = -EOPNOTSUPP;
191 goto unlock;
192 }
193
194 link = dev->link;
195 now = jiffies;
196 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
197 link->eh_context.unloaded_mask & (1 << dev->devno) &&
198 time_after(dev->unpark_deadline, now))
199 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
200 else
201 msecs = 0;
202
203unlock:
204 spin_unlock_irq(ap->lock);
205
206 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
207}
208
209static ssize_t ata_scsi_park_store(struct device *device,
210 struct device_attribute *attr,
211 const char *buf, size_t len)
212{
213 struct scsi_device *sdev = to_scsi_device(device);
214 struct ata_port *ap;
215 struct ata_device *dev;
216 long int input;
217 unsigned long flags;
218 int rc;
219
220 rc = kstrtol(buf, 10, &input);
221 if (rc)
222 return rc;
223 if (input < -2)
224 return -EINVAL;
225 if (input > ATA_TMOUT_MAX_PARK) {
226 rc = -EOVERFLOW;
227 input = ATA_TMOUT_MAX_PARK;
228 }
229
230 ap = ata_shost_to_port(sdev->host);
231
232 spin_lock_irqsave(ap->lock, flags);
233 dev = ata_scsi_find_dev(ap, sdev);
234 if (unlikely(!dev)) {
235 rc = -ENODEV;
236 goto unlock;
237 }
238 if (dev->class != ATA_DEV_ATA &&
239 dev->class != ATA_DEV_ZAC) {
240 rc = -EOPNOTSUPP;
241 goto unlock;
242 }
243
244 if (input >= 0) {
245 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
246 rc = -EOPNOTSUPP;
247 goto unlock;
248 }
249
250 dev->unpark_deadline = ata_deadline(jiffies, input);
251 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
252 ata_port_schedule_eh(ap);
253 complete(&ap->park_req_pending);
254 } else {
255 switch (input) {
256 case -1:
257 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
258 break;
259 case -2:
260 dev->flags |= ATA_DFLAG_NO_UNLOAD;
261 break;
262 }
263 }
264unlock:
265 spin_unlock_irqrestore(ap->lock, flags);
266
267 return rc ? rc : len;
268}
269DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
270 ata_scsi_park_show, ata_scsi_park_store);
271EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
272
273static void ata_scsi_set_sense(struct scsi_cmnd *cmd, u8 sk, u8 asc, u8 ascq)
274{
275 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
276
277 scsi_build_sense_buffer(0, cmd->sense_buffer, sk, asc, ascq);
278}
279
280static ssize_t
281ata_scsi_em_message_store(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283{
284 struct Scsi_Host *shost = class_to_shost(dev);
285 struct ata_port *ap = ata_shost_to_port(shost);
286 if (ap->ops->em_store && (ap->flags & ATA_FLAG_EM))
287 return ap->ops->em_store(ap, buf, count);
288 return -EINVAL;
289}
290
291static ssize_t
292ata_scsi_em_message_show(struct device *dev, struct device_attribute *attr,
293 char *buf)
294{
295 struct Scsi_Host *shost = class_to_shost(dev);
296 struct ata_port *ap = ata_shost_to_port(shost);
297
298 if (ap->ops->em_show && (ap->flags & ATA_FLAG_EM))
299 return ap->ops->em_show(ap, buf);
300 return -EINVAL;
301}
302DEVICE_ATTR(em_message, S_IRUGO | S_IWUSR,
303 ata_scsi_em_message_show, ata_scsi_em_message_store);
304EXPORT_SYMBOL_GPL(dev_attr_em_message);
305
306static ssize_t
307ata_scsi_em_message_type_show(struct device *dev, struct device_attribute *attr,
308 char *buf)
309{
310 struct Scsi_Host *shost = class_to_shost(dev);
311 struct ata_port *ap = ata_shost_to_port(shost);
312
313 return snprintf(buf, 23, "%d\n", ap->em_message_type);
314}
315DEVICE_ATTR(em_message_type, S_IRUGO,
316 ata_scsi_em_message_type_show, NULL);
317EXPORT_SYMBOL_GPL(dev_attr_em_message_type);
318
319static ssize_t
320ata_scsi_activity_show(struct device *dev, struct device_attribute *attr,
321 char *buf)
322{
323 struct scsi_device *sdev = to_scsi_device(dev);
324 struct ata_port *ap = ata_shost_to_port(sdev->host);
325 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
326
327 if (atadev && ap->ops->sw_activity_show &&
328 (ap->flags & ATA_FLAG_SW_ACTIVITY))
329 return ap->ops->sw_activity_show(atadev, buf);
330 return -EINVAL;
331}
332
333static ssize_t
334ata_scsi_activity_store(struct device *dev, struct device_attribute *attr,
335 const char *buf, size_t count)
336{
337 struct scsi_device *sdev = to_scsi_device(dev);
338 struct ata_port *ap = ata_shost_to_port(sdev->host);
339 struct ata_device *atadev = ata_scsi_find_dev(ap, sdev);
340 enum sw_activity val;
341 int rc;
342
343 if (atadev && ap->ops->sw_activity_store &&
344 (ap->flags & ATA_FLAG_SW_ACTIVITY)) {
345 val = simple_strtoul(buf, NULL, 0);
346 switch (val) {
347 case OFF: case BLINK_ON: case BLINK_OFF:
348 rc = ap->ops->sw_activity_store(atadev, val);
349 if (!rc)
350 return count;
351 else
352 return rc;
353 }
354 }
355 return -EINVAL;
356}
357DEVICE_ATTR(sw_activity, S_IWUSR | S_IRUGO, ata_scsi_activity_show,
358 ata_scsi_activity_store);
359EXPORT_SYMBOL_GPL(dev_attr_sw_activity);
360
361struct device_attribute *ata_common_sdev_attrs[] = {
362 &dev_attr_unload_heads,
363 NULL
364};
365EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
366
367static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
368{
369 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
370 /* "Invalid field in cbd" */
371 cmd->scsi_done(cmd);
372}
373
374/**
375 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
376 * @sdev: SCSI device for which BIOS geometry is to be determined
377 * @bdev: block device associated with @sdev
378 * @capacity: capacity of SCSI device
379 * @geom: location to which geometry will be output
380 *
381 * Generic bios head/sector/cylinder calculator
382 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
383 * mapping. Some situations may arise where the disk is not
384 * bootable if this is not used.
385 *
386 * LOCKING:
387 * Defined by the SCSI layer. We don't really care.
388 *
389 * RETURNS:
390 * Zero.
391 */
392int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
393 sector_t capacity, int geom[])
394{
395 geom[0] = 255;
396 geom[1] = 63;
397 sector_div(capacity, 255*63);
398 geom[2] = capacity;
399
400 return 0;
401}
402
403/**
404 * ata_scsi_unlock_native_capacity - unlock native capacity
405 * @sdev: SCSI device to adjust device capacity for
406 *
407 * This function is called if a partition on @sdev extends beyond
408 * the end of the device. It requests EH to unlock HPA.
409 *
410 * LOCKING:
411 * Defined by the SCSI layer. Might sleep.
412 */
413void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
414{
415 struct ata_port *ap = ata_shost_to_port(sdev->host);
416 struct ata_device *dev;
417 unsigned long flags;
418
419 spin_lock_irqsave(ap->lock, flags);
420
421 dev = ata_scsi_find_dev(ap, sdev);
422 if (dev && dev->n_sectors < dev->n_native_sectors) {
423 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
424 dev->link->eh_info.action |= ATA_EH_RESET;
425 ata_port_schedule_eh(ap);
426 }
427
428 spin_unlock_irqrestore(ap->lock, flags);
429 ata_port_wait_eh(ap);
430}
431
432/**
433 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
434 * @ap: target port
435 * @sdev: SCSI device to get identify data for
436 * @arg: User buffer area for identify data
437 *
438 * LOCKING:
439 * Defined by the SCSI layer. We don't really care.
440 *
441 * RETURNS:
442 * Zero on success, negative errno on error.
443 */
444static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
445 void __user *arg)
446{
447 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
448 u16 __user *dst = arg;
449 char buf[40];
450
451 if (!dev)
452 return -ENOMSG;
453
454 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
455 return -EFAULT;
456
457 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
458 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
459 return -EFAULT;
460
461 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
462 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
463 return -EFAULT;
464
465 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
466 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
467 return -EFAULT;
468
469 return 0;
470}
471
472/**
473 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
474 * @scsidev: Device to which we are issuing command
475 * @arg: User provided data for issuing command
476 *
477 * LOCKING:
478 * Defined by the SCSI layer. We don't really care.
479 *
480 * RETURNS:
481 * Zero on success, negative errno on error.
482 */
483int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
484{
485 int rc = 0;
486 u8 scsi_cmd[MAX_COMMAND_SIZE];
487 u8 args[4], *argbuf = NULL, *sensebuf = NULL;
488 int argsize = 0;
489 enum dma_data_direction data_dir;
490 int cmd_result;
491
492 if (arg == NULL)
493 return -EINVAL;
494
495 if (copy_from_user(args, arg, sizeof(args)))
496 return -EFAULT;
497
498 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
499 if (!sensebuf)
500 return -ENOMEM;
501
502 memset(scsi_cmd, 0, sizeof(scsi_cmd));
503
504 if (args[3]) {
505 argsize = ATA_SECT_SIZE * args[3];
506 argbuf = kmalloc(argsize, GFP_KERNEL);
507 if (argbuf == NULL) {
508 rc = -ENOMEM;
509 goto error;
510 }
511
512 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
513 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
514 block count in sector count field */
515 data_dir = DMA_FROM_DEVICE;
516 } else {
517 scsi_cmd[1] = (3 << 1); /* Non-data */
518 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
519 data_dir = DMA_NONE;
520 }
521
522 scsi_cmd[0] = ATA_16;
523
524 scsi_cmd[4] = args[2];
525 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
526 scsi_cmd[6] = args[3];
527 scsi_cmd[8] = args[1];
528 scsi_cmd[10] = 0x4f;
529 scsi_cmd[12] = 0xc2;
530 } else {
531 scsi_cmd[6] = args[1];
532 }
533 scsi_cmd[14] = args[0];
534
535 /* Good values for timeout and retries? Values below
536 from scsi_ioctl_send_command() for default case... */
537 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
538 sensebuf, (10*HZ), 5, 0, NULL);
539
540 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
541 u8 *desc = sensebuf + 8;
542 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
543
544 /* If we set cc then ATA pass-through will cause a
545 * check condition even if no error. Filter that. */
546 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
547 struct scsi_sense_hdr sshdr;
548 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
549 &sshdr);
550 if (sshdr.sense_key == RECOVERED_ERROR &&
551 sshdr.asc == 0 && sshdr.ascq == 0x1d)
552 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
553 }
554
555 /* Send userspace a few ATA registers (same as drivers/ide) */
556 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
557 desc[0] == 0x09) { /* code is "ATA Descriptor" */
558 args[0] = desc[13]; /* status */
559 args[1] = desc[3]; /* error */
560 args[2] = desc[5]; /* sector count (0:7) */
561 if (copy_to_user(arg, args, sizeof(args)))
562 rc = -EFAULT;
563 }
564 }
565
566
567 if (cmd_result) {
568 rc = -EIO;
569 goto error;
570 }
571
572 if ((argbuf)
573 && copy_to_user(arg + sizeof(args), argbuf, argsize))
574 rc = -EFAULT;
575error:
576 kfree(sensebuf);
577 kfree(argbuf);
578 return rc;
579}
580
581/**
582 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
583 * @scsidev: Device to which we are issuing command
584 * @arg: User provided data for issuing command
585 *
586 * LOCKING:
587 * Defined by the SCSI layer. We don't really care.
588 *
589 * RETURNS:
590 * Zero on success, negative errno on error.
591 */
592int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
593{
594 int rc = 0;
595 u8 scsi_cmd[MAX_COMMAND_SIZE];
596 u8 args[7], *sensebuf = NULL;
597 int cmd_result;
598
599 if (arg == NULL)
600 return -EINVAL;
601
602 if (copy_from_user(args, arg, sizeof(args)))
603 return -EFAULT;
604
605 sensebuf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_NOIO);
606 if (!sensebuf)
607 return -ENOMEM;
608
609 memset(scsi_cmd, 0, sizeof(scsi_cmd));
610 scsi_cmd[0] = ATA_16;
611 scsi_cmd[1] = (3 << 1); /* Non-data */
612 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
613 scsi_cmd[4] = args[1];
614 scsi_cmd[6] = args[2];
615 scsi_cmd[8] = args[3];
616 scsi_cmd[10] = args[4];
617 scsi_cmd[12] = args[5];
618 scsi_cmd[13] = args[6] & 0x4f;
619 scsi_cmd[14] = args[0];
620
621 /* Good values for timeout and retries? Values below
622 from scsi_ioctl_send_command() for default case... */
623 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
624 sensebuf, (10*HZ), 5, 0, NULL);
625
626 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
627 u8 *desc = sensebuf + 8;
628 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
629
630 /* If we set cc then ATA pass-through will cause a
631 * check condition even if no error. Filter that. */
632 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
633 struct scsi_sense_hdr sshdr;
634 scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE,
635 &sshdr);
636 if (sshdr.sense_key == RECOVERED_ERROR &&
637 sshdr.asc == 0 && sshdr.ascq == 0x1d)
638 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
639 }
640
641 /* Send userspace ATA registers */
642 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
643 desc[0] == 0x09) {/* code is "ATA Descriptor" */
644 args[0] = desc[13]; /* status */
645 args[1] = desc[3]; /* error */
646 args[2] = desc[5]; /* sector count (0:7) */
647 args[3] = desc[7]; /* lbal */
648 args[4] = desc[9]; /* lbam */
649 args[5] = desc[11]; /* lbah */
650 args[6] = desc[12]; /* select */
651 if (copy_to_user(arg, args, sizeof(args)))
652 rc = -EFAULT;
653 }
654 }
655
656 if (cmd_result) {
657 rc = -EIO;
658 goto error;
659 }
660
661 error:
662 kfree(sensebuf);
663 return rc;
664}
665
666static int ata_ioc32(struct ata_port *ap)
667{
668 if (ap->flags & ATA_FLAG_PIO_DMA)
669 return 1;
670 if (ap->pflags & ATA_PFLAG_PIO32)
671 return 1;
672 return 0;
673}
674
675int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
676 int cmd, void __user *arg)
677{
678 unsigned long val;
679 int rc = -EINVAL;
680 unsigned long flags;
681
682 switch (cmd) {
683 case HDIO_GET_32BIT:
684 spin_lock_irqsave(ap->lock, flags);
685 val = ata_ioc32(ap);
686 spin_unlock_irqrestore(ap->lock, flags);
687 return put_user(val, (unsigned long __user *)arg);
688
689 case HDIO_SET_32BIT:
690 val = (unsigned long) arg;
691 rc = 0;
692 spin_lock_irqsave(ap->lock, flags);
693 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
694 if (val)
695 ap->pflags |= ATA_PFLAG_PIO32;
696 else
697 ap->pflags &= ~ATA_PFLAG_PIO32;
698 } else {
699 if (val != ata_ioc32(ap))
700 rc = -EINVAL;
701 }
702 spin_unlock_irqrestore(ap->lock, flags);
703 return rc;
704
705 case HDIO_GET_IDENTITY:
706 return ata_get_identity(ap, scsidev, arg);
707
708 case HDIO_DRIVE_CMD:
709 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
710 return -EACCES;
711 return ata_cmd_ioctl(scsidev, arg);
712
713 case HDIO_DRIVE_TASK:
714 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
715 return -EACCES;
716 return ata_task_ioctl(scsidev, arg);
717
718 default:
719 rc = -ENOTTY;
720 break;
721 }
722
723 return rc;
724}
725EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
726
727int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
728{
729 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
730 scsidev, cmd, arg);
731}
732EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
733
734/**
735 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
736 * @dev: ATA device to which the new command is attached
737 * @cmd: SCSI command that originated this ATA command
738 *
739 * Obtain a reference to an unused ata_queued_cmd structure,
740 * which is the basic libata structure representing a single
741 * ATA command sent to the hardware.
742 *
743 * If a command was available, fill in the SCSI-specific
744 * portions of the structure with information on the
745 * current command.
746 *
747 * LOCKING:
748 * spin_lock_irqsave(host lock)
749 *
750 * RETURNS:
751 * Command allocated, or %NULL if none available.
752 */
753static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
754 struct scsi_cmnd *cmd)
755{
756 struct ata_queued_cmd *qc;
757
758 qc = ata_qc_new_init(dev, cmd->request->tag);
759 if (qc) {
760 qc->scsicmd = cmd;
761 qc->scsidone = cmd->scsi_done;
762
763 qc->sg = scsi_sglist(cmd);
764 qc->n_elem = scsi_sg_count(cmd);
765 } else {
766 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
767 cmd->scsi_done(cmd);
768 }
769
770 return qc;
771}
772
773static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
774{
775 struct scsi_cmnd *scmd = qc->scsicmd;
776
777 qc->extrabytes = scmd->request->extra_len;
778 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
779}
780
781/**
782 * ata_dump_status - user friendly display of error info
783 * @id: id of the port in question
784 * @tf: ptr to filled out taskfile
785 *
786 * Decode and dump the ATA error/status registers for the user so
787 * that they have some idea what really happened at the non
788 * make-believe layer.
789 *
790 * LOCKING:
791 * inherited from caller
792 */
793static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
794{
795 u8 stat = tf->command, err = tf->feature;
796
797 printk(KERN_WARNING "ata%u: status=0x%02x { ", id, stat);
798 if (stat & ATA_BUSY) {
799 printk("Busy }\n"); /* Data is not valid in this case */
800 } else {
801 if (stat & ATA_DRDY) printk("DriveReady ");
802 if (stat & ATA_DF) printk("DeviceFault ");
803 if (stat & ATA_DSC) printk("SeekComplete ");
804 if (stat & ATA_DRQ) printk("DataRequest ");
805 if (stat & ATA_CORR) printk("CorrectedError ");
806 if (stat & ATA_SENSE) printk("Sense ");
807 if (stat & ATA_ERR) printk("Error ");
808 printk("}\n");
809
810 if (err) {
811 printk(KERN_WARNING "ata%u: error=0x%02x { ", id, err);
812 if (err & ATA_ABORTED) printk("DriveStatusError ");
813 if (err & ATA_ICRC) {
814 if (err & ATA_ABORTED)
815 printk("BadCRC ");
816 else printk("Sector ");
817 }
818 if (err & ATA_UNC) printk("UncorrectableError ");
819 if (err & ATA_IDNF) printk("SectorIdNotFound ");
820 if (err & ATA_TRK0NF) printk("TrackZeroNotFound ");
821 if (err & ATA_AMNF) printk("AddrMarkNotFound ");
822 printk("}\n");
823 }
824 }
825}
826
827/**
828 * ata_to_sense_error - convert ATA error to SCSI error
829 * @id: ATA device number
830 * @drv_stat: value contained in ATA status register
831 * @drv_err: value contained in ATA error register
832 * @sk: the sense key we'll fill out
833 * @asc: the additional sense code we'll fill out
834 * @ascq: the additional sense code qualifier we'll fill out
835 * @verbose: be verbose
836 *
837 * Converts an ATA error into a SCSI error. Fill out pointers to
838 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
839 * format sense blocks.
840 *
841 * LOCKING:
842 * spin_lock_irqsave(host lock)
843 */
844static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
845 u8 *asc, u8 *ascq, int verbose)
846{
847 int i;
848
849 /* Based on the 3ware driver translation table */
850 static const unsigned char sense_table[][4] = {
851 /* BBD|ECC|ID|MAR */
852 {0xd1, ABORTED_COMMAND, 0x00, 0x00},
853 // Device busy Aborted command
854 /* BBD|ECC|ID */
855 {0xd0, ABORTED_COMMAND, 0x00, 0x00},
856 // Device busy Aborted command
857 /* ECC|MC|MARK */
858 {0x61, HARDWARE_ERROR, 0x00, 0x00},
859 // Device fault Hardware error
860 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
861 {0x84, ABORTED_COMMAND, 0x47, 0x00},
862 // Data CRC error SCSI parity error
863 /* MC|ID|ABRT|TRK0|MARK */
864 {0x37, NOT_READY, 0x04, 0x00},
865 // Unit offline Not ready
866 /* MCR|MARK */
867 {0x09, NOT_READY, 0x04, 0x00},
868 // Unrecovered disk error Not ready
869 /* Bad address mark */
870 {0x01, MEDIUM_ERROR, 0x13, 0x00},
871 // Address mark not found for data field
872 /* TRK0 - Track 0 not found */
873 {0x02, HARDWARE_ERROR, 0x00, 0x00},
874 // Hardware error
875 /* Abort: 0x04 is not translated here, see below */
876 /* Media change request */
877 {0x08, NOT_READY, 0x04, 0x00},
878 // FIXME: faking offline
879 /* SRV/IDNF - ID not found */
880 {0x10, ILLEGAL_REQUEST, 0x21, 0x00},
881 // Logical address out of range
882 /* MC - Media Changed */
883 {0x20, UNIT_ATTENTION, 0x28, 0x00},
884 // Not ready to ready change, medium may have changed
885 /* ECC - Uncorrectable ECC error */
886 {0x40, MEDIUM_ERROR, 0x11, 0x04},
887 // Unrecovered read error
888 /* BBD - block marked bad */
889 {0x80, MEDIUM_ERROR, 0x11, 0x04},
890 // Block marked bad Medium error, unrecovered read error
891 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
892 };
893 static const unsigned char stat_table[][4] = {
894 /* Must be first because BUSY means no other bits valid */
895 {0x80, ABORTED_COMMAND, 0x47, 0x00},
896 // Busy, fake parity for now
897 {0x40, ILLEGAL_REQUEST, 0x21, 0x04},
898 // Device ready, unaligned write command
899 {0x20, HARDWARE_ERROR, 0x44, 0x00},
900 // Device fault, internal target failure
901 {0x08, ABORTED_COMMAND, 0x47, 0x00},
902 // Timed out in xfer, fake parity for now
903 {0x04, RECOVERED_ERROR, 0x11, 0x00},
904 // Recovered ECC error Medium error, recovered
905 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
906 };
907
908 /*
909 * Is this an error we can process/parse
910 */
911 if (drv_stat & ATA_BUSY) {
912 drv_err = 0; /* Ignore the err bits, they're invalid */
913 }
914
915 if (drv_err) {
916 /* Look for drv_err */
917 for (i = 0; sense_table[i][0] != 0xFF; i++) {
918 /* Look for best matches first */
919 if ((sense_table[i][0] & drv_err) ==
920 sense_table[i][0]) {
921 *sk = sense_table[i][1];
922 *asc = sense_table[i][2];
923 *ascq = sense_table[i][3];
924 goto translate_done;
925 }
926 }
927 }
928
929 /*
930 * Fall back to interpreting status bits. Note that if the drv_err
931 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
932 * is not descriptive enough.
933 */
934 for (i = 0; stat_table[i][0] != 0xFF; i++) {
935 if (stat_table[i][0] & drv_stat) {
936 *sk = stat_table[i][1];
937 *asc = stat_table[i][2];
938 *ascq = stat_table[i][3];
939 goto translate_done;
940 }
941 }
942
943 /*
944 * We need a sensible error return here, which is tricky, and one
945 * that won't cause people to do things like return a disk wrongly.
946 */
947 *sk = ABORTED_COMMAND;
948 *asc = 0x00;
949 *ascq = 0x00;
950
951 translate_done:
952 if (verbose)
953 printk(KERN_ERR "ata%u: translated ATA stat/err 0x%02x/%02x "
954 "to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
955 id, drv_stat, drv_err, *sk, *asc, *ascq);
956 return;
957}
958
959/*
960 * ata_gen_passthru_sense - Generate check condition sense block.
961 * @qc: Command that completed.
962 *
963 * This function is specific to the ATA descriptor format sense
964 * block specified for the ATA pass through commands. Regardless
965 * of whether the command errored or not, return a sense
966 * block. Copy all controller registers into the sense
967 * block. If there was no error, we get the request from an ATA
968 * passthrough command, so we use the following sense data:
969 * sk = RECOVERED ERROR
970 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
971 *
972 *
973 * LOCKING:
974 * None.
975 */
976static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
977{
978 struct scsi_cmnd *cmd = qc->scsicmd;
979 struct ata_taskfile *tf = &qc->result_tf;
980 unsigned char *sb = cmd->sense_buffer;
981 unsigned char *desc = sb + 8;
982 int verbose = qc->ap->ops->error_handler == NULL;
983
984 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
985
986 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
987
988 /*
989 * Use ata_to_sense_error() to map status register bits
990 * onto sense key, asc & ascq.
991 */
992 if (qc->err_mask ||
993 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
994 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
995 &sb[1], &sb[2], &sb[3], verbose);
996 sb[1] &= 0x0f;
997 } else {
998 sb[1] = RECOVERED_ERROR;
999 sb[2] = 0;
1000 sb[3] = 0x1D;
1001 }
1002
1003 /*
1004 * Sense data is current and format is descriptor.
1005 */
1006 sb[0] = 0x72;
1007
1008 desc[0] = 0x09;
1009
1010 /* set length of additional sense data */
1011 sb[7] = 14;
1012 desc[1] = 12;
1013
1014 /*
1015 * Copy registers into sense buffer.
1016 */
1017 desc[2] = 0x00;
1018 desc[3] = tf->feature; /* == error reg */
1019 desc[5] = tf->nsect;
1020 desc[7] = tf->lbal;
1021 desc[9] = tf->lbam;
1022 desc[11] = tf->lbah;
1023 desc[12] = tf->device;
1024 desc[13] = tf->command; /* == status reg */
1025
1026 /*
1027 * Fill in Extend bit, and the high order bytes
1028 * if applicable.
1029 */
1030 if (tf->flags & ATA_TFLAG_LBA48) {
1031 desc[2] |= 0x01;
1032 desc[4] = tf->hob_nsect;
1033 desc[6] = tf->hob_lbal;
1034 desc[8] = tf->hob_lbam;
1035 desc[10] = tf->hob_lbah;
1036 }
1037}
1038
1039/**
1040 * ata_gen_ata_sense - generate a SCSI fixed sense block
1041 * @qc: Command that we are erroring out
1042 *
1043 * Generate sense block for a failed ATA command @qc. Descriptor
1044 * format is used to accommodate LBA48 block address.
1045 *
1046 * LOCKING:
1047 * None.
1048 */
1049static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
1050{
1051 struct ata_device *dev = qc->dev;
1052 struct scsi_cmnd *cmd = qc->scsicmd;
1053 struct ata_taskfile *tf = &qc->result_tf;
1054 unsigned char *sb = cmd->sense_buffer;
1055 unsigned char *desc = sb + 8;
1056 int verbose = qc->ap->ops->error_handler == NULL;
1057 u64 block;
1058
1059 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
1060
1061 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
1062
1063 /* sense data is current and format is descriptor */
1064 sb[0] = 0x72;
1065
1066 /* Use ata_to_sense_error() to map status register bits
1067 * onto sense key, asc & ascq.
1068 */
1069 if (qc->err_mask ||
1070 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1071 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
1072 &sb[1], &sb[2], &sb[3], verbose);
1073 sb[1] &= 0x0f;
1074 }
1075
1076 block = ata_tf_read_block(&qc->result_tf, dev);
1077
1078 /* information sense data descriptor */
1079 sb[7] = 12;
1080 desc[0] = 0x00;
1081 desc[1] = 10;
1082
1083 desc[2] |= 0x80; /* valid */
1084 desc[6] = block >> 40;
1085 desc[7] = block >> 32;
1086 desc[8] = block >> 24;
1087 desc[9] = block >> 16;
1088 desc[10] = block >> 8;
1089 desc[11] = block;
1090}
1091
1092static void ata_scsi_sdev_config(struct scsi_device *sdev)
1093{
1094 sdev->use_10_for_rw = 1;
1095 sdev->use_10_for_ms = 1;
1096 sdev->no_report_opcodes = 1;
1097 sdev->no_write_same = 1;
1098
1099 /* Schedule policy is determined by ->qc_defer() callback and
1100 * it needs to see every deferred qc. Set dev_blocked to 1 to
1101 * prevent SCSI midlayer from automatically deferring
1102 * requests.
1103 */
1104 sdev->max_device_blocked = 1;
1105}
1106
1107/**
1108 * atapi_drain_needed - Check whether data transfer may overflow
1109 * @rq: request to be checked
1110 *
1111 * ATAPI commands which transfer variable length data to host
1112 * might overflow due to application error or hardare bug. This
1113 * function checks whether overflow should be drained and ignored
1114 * for @request.
1115 *
1116 * LOCKING:
1117 * None.
1118 *
1119 * RETURNS:
1120 * 1 if ; otherwise, 0.
1121 */
1122static int atapi_drain_needed(struct request *rq)
1123{
1124 if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
1125 return 0;
1126
1127 if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
1128 return 0;
1129
1130 return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;
1131}
1132
1133static int ata_scsi_dev_config(struct scsi_device *sdev,
1134 struct ata_device *dev)
1135{
1136 struct request_queue *q = sdev->request_queue;
1137
1138 if (!ata_id_has_unload(dev->id))
1139 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1140
1141 /* configure max sectors */
1142 blk_queue_max_hw_sectors(q, dev->max_sectors);
1143
1144 if (dev->class == ATA_DEV_ATAPI) {
1145 void *buf;
1146
1147 sdev->sector_size = ATA_SECT_SIZE;
1148
1149 /* set DMA padding */
1150 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1151
1152 /* configure draining */
1153 buf = kmalloc(ATAPI_MAX_DRAIN, q->bounce_gfp | GFP_KERNEL);
1154 if (!buf) {
1155 ata_dev_err(dev, "drain buffer allocation failed\n");
1156 return -ENOMEM;
1157 }
1158
1159 blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
1160 } else {
1161 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1162 sdev->manage_start_stop = 1;
1163 }
1164
1165 /*
1166 * ata_pio_sectors() expects buffer for each sector to not cross
1167 * page boundary. Enforce it by requiring buffers to be sector
1168 * aligned, which works iff sector_size is not larger than
1169 * PAGE_SIZE. ATAPI devices also need the alignment as
1170 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1171 */
1172 if (sdev->sector_size > PAGE_SIZE)
1173 ata_dev_warn(dev,
1174 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1175 sdev->sector_size);
1176
1177 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1178
1179 if (dev->flags & ATA_DFLAG_AN)
1180 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1181
1182 if (dev->flags & ATA_DFLAG_NCQ) {
1183 int depth;
1184
1185 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1186 depth = min(ATA_MAX_QUEUE - 1, depth);
1187 scsi_change_queue_depth(sdev, depth);
1188 }
1189
1190 blk_queue_flush_queueable(q, false);
1191
1192 dev->sdev = sdev;
1193 return 0;
1194}
1195
1196/**
1197 * ata_scsi_slave_config - Set SCSI device attributes
1198 * @sdev: SCSI device to examine
1199 *
1200 * This is called before we actually start reading
1201 * and writing to the device, to configure certain
1202 * SCSI mid-layer behaviors.
1203 *
1204 * LOCKING:
1205 * Defined by SCSI layer. We don't really care.
1206 */
1207
1208int ata_scsi_slave_config(struct scsi_device *sdev)
1209{
1210 struct ata_port *ap = ata_shost_to_port(sdev->host);
1211 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1212 int rc = 0;
1213
1214 ata_scsi_sdev_config(sdev);
1215
1216 if (dev)
1217 rc = ata_scsi_dev_config(sdev, dev);
1218
1219 return rc;
1220}
1221
1222/**
1223 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1224 * @sdev: SCSI device to be destroyed
1225 *
1226 * @sdev is about to be destroyed for hot/warm unplugging. If
1227 * this unplugging was initiated by libata as indicated by NULL
1228 * dev->sdev, this function doesn't have to do anything.
1229 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1230 * Clear dev->sdev, schedule the device for ATA detach and invoke
1231 * EH.
1232 *
1233 * LOCKING:
1234 * Defined by SCSI layer. We don't really care.
1235 */
1236void ata_scsi_slave_destroy(struct scsi_device *sdev)
1237{
1238 struct ata_port *ap = ata_shost_to_port(sdev->host);
1239 struct request_queue *q = sdev->request_queue;
1240 unsigned long flags;
1241 struct ata_device *dev;
1242
1243 if (!ap->ops->error_handler)
1244 return;
1245
1246 spin_lock_irqsave(ap->lock, flags);
1247 dev = __ata_scsi_find_dev(ap, sdev);
1248 if (dev && dev->sdev) {
1249 /* SCSI device already in CANCEL state, no need to offline it */
1250 dev->sdev = NULL;
1251 dev->flags |= ATA_DFLAG_DETACH;
1252 ata_port_schedule_eh(ap);
1253 }
1254 spin_unlock_irqrestore(ap->lock, flags);
1255
1256 kfree(q->dma_drain_buffer);
1257 q->dma_drain_buffer = NULL;
1258 q->dma_drain_size = 0;
1259}
1260
1261/**
1262 * __ata_change_queue_depth - helper for ata_scsi_change_queue_depth
1263 * @ap: ATA port to which the device change the queue depth
1264 * @sdev: SCSI device to configure queue depth for
1265 * @queue_depth: new queue depth
1266 *
1267 * libsas and libata have different approaches for associating a sdev to
1268 * its ata_port.
1269 *
1270 */
1271int __ata_change_queue_depth(struct ata_port *ap, struct scsi_device *sdev,
1272 int queue_depth)
1273{
1274 struct ata_device *dev;
1275 unsigned long flags;
1276
1277 if (queue_depth < 1 || queue_depth == sdev->queue_depth)
1278 return sdev->queue_depth;
1279
1280 dev = ata_scsi_find_dev(ap, sdev);
1281 if (!dev || !ata_dev_enabled(dev))
1282 return sdev->queue_depth;
1283
1284 /* NCQ enabled? */
1285 spin_lock_irqsave(ap->lock, flags);
1286 dev->flags &= ~ATA_DFLAG_NCQ_OFF;
1287 if (queue_depth == 1 || !ata_ncq_enabled(dev)) {
1288 dev->flags |= ATA_DFLAG_NCQ_OFF;
1289 queue_depth = 1;
1290 }
1291 spin_unlock_irqrestore(ap->lock, flags);
1292
1293 /* limit and apply queue depth */
1294 queue_depth = min(queue_depth, sdev->host->can_queue);
1295 queue_depth = min(queue_depth, ata_id_queue_depth(dev->id));
1296 queue_depth = min(queue_depth, ATA_MAX_QUEUE - 1);
1297
1298 if (sdev->queue_depth == queue_depth)
1299 return -EINVAL;
1300
1301 return scsi_change_queue_depth(sdev, queue_depth);
1302}
1303
1304/**
1305 * ata_scsi_change_queue_depth - SCSI callback for queue depth config
1306 * @sdev: SCSI device to configure queue depth for
1307 * @queue_depth: new queue depth
1308 *
1309 * This is libata standard hostt->change_queue_depth callback.
1310 * SCSI will call into this callback when user tries to set queue
1311 * depth via sysfs.
1312 *
1313 * LOCKING:
1314 * SCSI layer (we don't care)
1315 *
1316 * RETURNS:
1317 * Newly configured queue depth.
1318 */
1319int ata_scsi_change_queue_depth(struct scsi_device *sdev, int queue_depth)
1320{
1321 struct ata_port *ap = ata_shost_to_port(sdev->host);
1322
1323 return __ata_change_queue_depth(ap, sdev, queue_depth);
1324}
1325
1326/**
1327 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1328 * @qc: Storage for translated ATA taskfile
1329 *
1330 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1331 * (to start). Perhaps these commands should be preceded by
1332 * CHECK POWER MODE to see what power mode the device is already in.
1333 * [See SAT revision 5 at www.t10.org]
1334 *
1335 * LOCKING:
1336 * spin_lock_irqsave(host lock)
1337 *
1338 * RETURNS:
1339 * Zero on success, non-zero on error.
1340 */
1341static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1342{
1343 struct scsi_cmnd *scmd = qc->scsicmd;
1344 struct ata_taskfile *tf = &qc->tf;
1345 const u8 *cdb = scmd->cmnd;
1346
1347 if (scmd->cmd_len < 5)
1348 goto invalid_fld;
1349
1350 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1351 tf->protocol = ATA_PROT_NODATA;
1352 if (cdb[1] & 0x1) {
1353 ; /* ignore IMMED bit, violates sat-r05 */
1354 }
1355 if (cdb[4] & 0x2)
1356 goto invalid_fld; /* LOEJ bit set not supported */
1357 if (((cdb[4] >> 4) & 0xf) != 0)
1358 goto invalid_fld; /* power conditions not supported */
1359
1360 if (cdb[4] & 0x1) {
1361 tf->nsect = 1; /* 1 sector, lba=0 */
1362
1363 if (qc->dev->flags & ATA_DFLAG_LBA) {
1364 tf->flags |= ATA_TFLAG_LBA;
1365
1366 tf->lbah = 0x0;
1367 tf->lbam = 0x0;
1368 tf->lbal = 0x0;
1369 tf->device |= ATA_LBA;
1370 } else {
1371 /* CHS */
1372 tf->lbal = 0x1; /* sect */
1373 tf->lbam = 0x0; /* cyl low */
1374 tf->lbah = 0x0; /* cyl high */
1375 }
1376
1377 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1378 } else {
1379 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1380 * or S5) causing some drives to spin up and down again.
1381 */
1382 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1383 system_state == SYSTEM_POWER_OFF)
1384 goto skip;
1385
1386 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1387 system_entering_hibernation())
1388 goto skip;
1389
1390 /* Issue ATA STANDBY IMMEDIATE command */
1391 tf->command = ATA_CMD_STANDBYNOW1;
1392 }
1393
1394 /*
1395 * Standby and Idle condition timers could be implemented but that
1396 * would require libata to implement the Power condition mode page
1397 * and allow the user to change it. Changing mode pages requires
1398 * MODE SELECT to be implemented.
1399 */
1400
1401 return 0;
1402
1403 invalid_fld:
1404 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1405 /* "Invalid field in cbd" */
1406 return 1;
1407 skip:
1408 scmd->result = SAM_STAT_GOOD;
1409 return 1;
1410}
1411
1412
1413/**
1414 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1415 * @qc: Storage for translated ATA taskfile
1416 *
1417 * Sets up an ATA taskfile to issue FLUSH CACHE or
1418 * FLUSH CACHE EXT.
1419 *
1420 * LOCKING:
1421 * spin_lock_irqsave(host lock)
1422 *
1423 * RETURNS:
1424 * Zero on success, non-zero on error.
1425 */
1426static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1427{
1428 struct ata_taskfile *tf = &qc->tf;
1429
1430 tf->flags |= ATA_TFLAG_DEVICE;
1431 tf->protocol = ATA_PROT_NODATA;
1432
1433 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1434 tf->command = ATA_CMD_FLUSH_EXT;
1435 else
1436 tf->command = ATA_CMD_FLUSH;
1437
1438 /* flush is critical for IO integrity, consider it an IO command */
1439 qc->flags |= ATA_QCFLAG_IO;
1440
1441 return 0;
1442}
1443
1444/**
1445 * scsi_6_lba_len - Get LBA and transfer length
1446 * @cdb: SCSI command to translate
1447 *
1448 * Calculate LBA and transfer length for 6-byte commands.
1449 *
1450 * RETURNS:
1451 * @plba: the LBA
1452 * @plen: the transfer length
1453 */
1454static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1455{
1456 u64 lba = 0;
1457 u32 len;
1458
1459 VPRINTK("six-byte command\n");
1460
1461 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1462 lba |= ((u64)cdb[2]) << 8;
1463 lba |= ((u64)cdb[3]);
1464
1465 len = cdb[4];
1466
1467 *plba = lba;
1468 *plen = len;
1469}
1470
1471/**
1472 * scsi_10_lba_len - Get LBA and transfer length
1473 * @cdb: SCSI command to translate
1474 *
1475 * Calculate LBA and transfer length for 10-byte commands.
1476 *
1477 * RETURNS:
1478 * @plba: the LBA
1479 * @plen: the transfer length
1480 */
1481static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1482{
1483 u64 lba = 0;
1484 u32 len = 0;
1485
1486 VPRINTK("ten-byte command\n");
1487
1488 lba |= ((u64)cdb[2]) << 24;
1489 lba |= ((u64)cdb[3]) << 16;
1490 lba |= ((u64)cdb[4]) << 8;
1491 lba |= ((u64)cdb[5]);
1492
1493 len |= ((u32)cdb[7]) << 8;
1494 len |= ((u32)cdb[8]);
1495
1496 *plba = lba;
1497 *plen = len;
1498}
1499
1500/**
1501 * scsi_16_lba_len - Get LBA and transfer length
1502 * @cdb: SCSI command to translate
1503 *
1504 * Calculate LBA and transfer length for 16-byte commands.
1505 *
1506 * RETURNS:
1507 * @plba: the LBA
1508 * @plen: the transfer length
1509 */
1510static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1511{
1512 u64 lba = 0;
1513 u32 len = 0;
1514
1515 VPRINTK("sixteen-byte command\n");
1516
1517 lba |= ((u64)cdb[2]) << 56;
1518 lba |= ((u64)cdb[3]) << 48;
1519 lba |= ((u64)cdb[4]) << 40;
1520 lba |= ((u64)cdb[5]) << 32;
1521 lba |= ((u64)cdb[6]) << 24;
1522 lba |= ((u64)cdb[7]) << 16;
1523 lba |= ((u64)cdb[8]) << 8;
1524 lba |= ((u64)cdb[9]);
1525
1526 len |= ((u32)cdb[10]) << 24;
1527 len |= ((u32)cdb[11]) << 16;
1528 len |= ((u32)cdb[12]) << 8;
1529 len |= ((u32)cdb[13]);
1530
1531 *plba = lba;
1532 *plen = len;
1533}
1534
1535/**
1536 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1537 * @qc: Storage for translated ATA taskfile
1538 *
1539 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1540 *
1541 * LOCKING:
1542 * spin_lock_irqsave(host lock)
1543 *
1544 * RETURNS:
1545 * Zero on success, non-zero on error.
1546 */
1547static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1548{
1549 struct scsi_cmnd *scmd = qc->scsicmd;
1550 struct ata_taskfile *tf = &qc->tf;
1551 struct ata_device *dev = qc->dev;
1552 u64 dev_sectors = qc->dev->n_sectors;
1553 const u8 *cdb = scmd->cmnd;
1554 u64 block;
1555 u32 n_block;
1556
1557 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1558 tf->protocol = ATA_PROT_NODATA;
1559
1560 if (cdb[0] == VERIFY) {
1561 if (scmd->cmd_len < 10)
1562 goto invalid_fld;
1563 scsi_10_lba_len(cdb, &block, &n_block);
1564 } else if (cdb[0] == VERIFY_16) {
1565 if (scmd->cmd_len < 16)
1566 goto invalid_fld;
1567 scsi_16_lba_len(cdb, &block, &n_block);
1568 } else
1569 goto invalid_fld;
1570
1571 if (!n_block)
1572 goto nothing_to_do;
1573 if (block >= dev_sectors)
1574 goto out_of_range;
1575 if ((block + n_block) > dev_sectors)
1576 goto out_of_range;
1577
1578 if (dev->flags & ATA_DFLAG_LBA) {
1579 tf->flags |= ATA_TFLAG_LBA;
1580
1581 if (lba_28_ok(block, n_block)) {
1582 /* use LBA28 */
1583 tf->command = ATA_CMD_VERIFY;
1584 tf->device |= (block >> 24) & 0xf;
1585 } else if (lba_48_ok(block, n_block)) {
1586 if (!(dev->flags & ATA_DFLAG_LBA48))
1587 goto out_of_range;
1588
1589 /* use LBA48 */
1590 tf->flags |= ATA_TFLAG_LBA48;
1591 tf->command = ATA_CMD_VERIFY_EXT;
1592
1593 tf->hob_nsect = (n_block >> 8) & 0xff;
1594
1595 tf->hob_lbah = (block >> 40) & 0xff;
1596 tf->hob_lbam = (block >> 32) & 0xff;
1597 tf->hob_lbal = (block >> 24) & 0xff;
1598 } else
1599 /* request too large even for LBA48 */
1600 goto out_of_range;
1601
1602 tf->nsect = n_block & 0xff;
1603
1604 tf->lbah = (block >> 16) & 0xff;
1605 tf->lbam = (block >> 8) & 0xff;
1606 tf->lbal = block & 0xff;
1607
1608 tf->device |= ATA_LBA;
1609 } else {
1610 /* CHS */
1611 u32 sect, head, cyl, track;
1612
1613 if (!lba_28_ok(block, n_block))
1614 goto out_of_range;
1615
1616 /* Convert LBA to CHS */
1617 track = (u32)block / dev->sectors;
1618 cyl = track / dev->heads;
1619 head = track % dev->heads;
1620 sect = (u32)block % dev->sectors + 1;
1621
1622 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1623 (u32)block, track, cyl, head, sect);
1624
1625 /* Check whether the converted CHS can fit.
1626 Cylinder: 0-65535
1627 Head: 0-15
1628 Sector: 1-255*/
1629 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1630 goto out_of_range;
1631
1632 tf->command = ATA_CMD_VERIFY;
1633 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1634 tf->lbal = sect;
1635 tf->lbam = cyl;
1636 tf->lbah = cyl >> 8;
1637 tf->device |= head;
1638 }
1639
1640 return 0;
1641
1642invalid_fld:
1643 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1644 /* "Invalid field in cbd" */
1645 return 1;
1646
1647out_of_range:
1648 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1649 /* "Logical Block Address out of range" */
1650 return 1;
1651
1652nothing_to_do:
1653 scmd->result = SAM_STAT_GOOD;
1654 return 1;
1655}
1656
1657/**
1658 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1659 * @qc: Storage for translated ATA taskfile
1660 *
1661 * Converts any of six SCSI read/write commands into the
1662 * ATA counterpart, including starting sector (LBA),
1663 * sector count, and taking into account the device's LBA48
1664 * support.
1665 *
1666 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1667 * %WRITE_16 are currently supported.
1668 *
1669 * LOCKING:
1670 * spin_lock_irqsave(host lock)
1671 *
1672 * RETURNS:
1673 * Zero on success, non-zero on error.
1674 */
1675static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1676{
1677 struct scsi_cmnd *scmd = qc->scsicmd;
1678 const u8 *cdb = scmd->cmnd;
1679 unsigned int tf_flags = 0;
1680 u64 block;
1681 u32 n_block;
1682 int rc;
1683
1684 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1685 tf_flags |= ATA_TFLAG_WRITE;
1686
1687 /* Calculate the SCSI LBA, transfer length and FUA. */
1688 switch (cdb[0]) {
1689 case READ_10:
1690 case WRITE_10:
1691 if (unlikely(scmd->cmd_len < 10))
1692 goto invalid_fld;
1693 scsi_10_lba_len(cdb, &block, &n_block);
1694 if (cdb[1] & (1 << 3))
1695 tf_flags |= ATA_TFLAG_FUA;
1696 break;
1697 case READ_6:
1698 case WRITE_6:
1699 if (unlikely(scmd->cmd_len < 6))
1700 goto invalid_fld;
1701 scsi_6_lba_len(cdb, &block, &n_block);
1702
1703 /* for 6-byte r/w commands, transfer length 0
1704 * means 256 blocks of data, not 0 block.
1705 */
1706 if (!n_block)
1707 n_block = 256;
1708 break;
1709 case READ_16:
1710 case WRITE_16:
1711 if (unlikely(scmd->cmd_len < 16))
1712 goto invalid_fld;
1713 scsi_16_lba_len(cdb, &block, &n_block);
1714 if (cdb[1] & (1 << 3))
1715 tf_flags |= ATA_TFLAG_FUA;
1716 break;
1717 default:
1718 DPRINTK("no-byte command\n");
1719 goto invalid_fld;
1720 }
1721
1722 /* Check and compose ATA command */
1723 if (!n_block)
1724 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1725 * length 0 means transfer 0 block of data.
1726 * However, for ATA R/W commands, sector count 0 means
1727 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1728 *
1729 * WARNING: one or two older ATA drives treat 0 as 0...
1730 */
1731 goto nothing_to_do;
1732
1733 qc->flags |= ATA_QCFLAG_IO;
1734 qc->nbytes = n_block * scmd->device->sector_size;
1735
1736 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1737 qc->tag);
1738 if (likely(rc == 0))
1739 return 0;
1740
1741 if (rc == -ERANGE)
1742 goto out_of_range;
1743 /* treat all other errors as -EINVAL, fall through */
1744invalid_fld:
1745 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
1746 /* "Invalid field in cbd" */
1747 return 1;
1748
1749out_of_range:
1750 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1751 /* "Logical Block Address out of range" */
1752 return 1;
1753
1754nothing_to_do:
1755 scmd->result = SAM_STAT_GOOD;
1756 return 1;
1757}
1758
1759static void ata_qc_done(struct ata_queued_cmd *qc)
1760{
1761 struct scsi_cmnd *cmd = qc->scsicmd;
1762 void (*done)(struct scsi_cmnd *) = qc->scsidone;
1763
1764 ata_qc_free(qc);
1765 done(cmd);
1766}
1767
1768static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1769{
1770 struct ata_port *ap = qc->ap;
1771 struct scsi_cmnd *cmd = qc->scsicmd;
1772 u8 *cdb = cmd->cmnd;
1773 int need_sense = (qc->err_mask != 0);
1774
1775 /* For ATA pass thru (SAT) commands, generate a sense block if
1776 * user mandated it or if there's an error. Note that if we
1777 * generate because the user forced us to [CK_COND =1], a check
1778 * condition is generated and the ATA register values are returned
1779 * whether the command completed successfully or not. If there
1780 * was no error, we use the following sense data:
1781 * sk = RECOVERED ERROR
1782 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1783 */
1784 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1785 ((cdb[2] & 0x20) || need_sense))
1786 ata_gen_passthru_sense(qc);
1787 else if (need_sense)
1788 ata_gen_ata_sense(qc);
1789 else
1790 cmd->result = SAM_STAT_GOOD;
1791
1792 if (need_sense && !ap->ops->error_handler)
1793 ata_dump_status(ap->print_id, &qc->result_tf);
1794
1795 ata_qc_done(qc);
1796}
1797
1798/**
1799 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1800 * @dev: ATA device to which the command is addressed
1801 * @cmd: SCSI command to execute
1802 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1803 *
1804 * Our ->queuecommand() function has decided that the SCSI
1805 * command issued can be directly translated into an ATA
1806 * command, rather than handled internally.
1807 *
1808 * This function sets up an ata_queued_cmd structure for the
1809 * SCSI command, and sends that ata_queued_cmd to the hardware.
1810 *
1811 * The xlat_func argument (actor) returns 0 if ready to execute
1812 * ATA command, else 1 to finish translation. If 1 is returned
1813 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1814 * to be set reflecting an error condition or clean (early)
1815 * termination.
1816 *
1817 * LOCKING:
1818 * spin_lock_irqsave(host lock)
1819 *
1820 * RETURNS:
1821 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1822 * needs to be deferred.
1823 */
1824static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1825 ata_xlat_func_t xlat_func)
1826{
1827 struct ata_port *ap = dev->link->ap;
1828 struct ata_queued_cmd *qc;
1829 int rc;
1830
1831 VPRINTK("ENTER\n");
1832
1833 qc = ata_scsi_qc_new(dev, cmd);
1834 if (!qc)
1835 goto err_mem;
1836
1837 /* data is present; dma-map it */
1838 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1839 cmd->sc_data_direction == DMA_TO_DEVICE) {
1840 if (unlikely(scsi_bufflen(cmd) < 1)) {
1841 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1842 goto err_did;
1843 }
1844
1845 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1846
1847 qc->dma_dir = cmd->sc_data_direction;
1848 }
1849
1850 qc->complete_fn = ata_scsi_qc_complete;
1851
1852 if (xlat_func(qc))
1853 goto early_finish;
1854
1855 if (ap->ops->qc_defer) {
1856 if ((rc = ap->ops->qc_defer(qc)))
1857 goto defer;
1858 }
1859
1860 /* select device, send command to hardware */
1861 ata_qc_issue(qc);
1862
1863 VPRINTK("EXIT\n");
1864 return 0;
1865
1866early_finish:
1867 ata_qc_free(qc);
1868 cmd->scsi_done(cmd);
1869 DPRINTK("EXIT - early finish (good or error)\n");
1870 return 0;
1871
1872err_did:
1873 ata_qc_free(qc);
1874 cmd->result = (DID_ERROR << 16);
1875 cmd->scsi_done(cmd);
1876err_mem:
1877 DPRINTK("EXIT - internal\n");
1878 return 0;
1879
1880defer:
1881 ata_qc_free(qc);
1882 DPRINTK("EXIT - defer\n");
1883 if (rc == ATA_DEFER_LINK)
1884 return SCSI_MLQUEUE_DEVICE_BUSY;
1885 else
1886 return SCSI_MLQUEUE_HOST_BUSY;
1887}
1888
1889/**
1890 * ata_scsi_rbuf_get - Map response buffer.
1891 * @cmd: SCSI command containing buffer to be mapped.
1892 * @flags: unsigned long variable to store irq enable status
1893 * @copy_in: copy in from user buffer
1894 *
1895 * Prepare buffer for simulated SCSI commands.
1896 *
1897 * LOCKING:
1898 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1899 *
1900 * RETURNS:
1901 * Pointer to response buffer.
1902 */
1903static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1904 unsigned long *flags)
1905{
1906 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1907
1908 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1909 if (copy_in)
1910 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1911 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1912 return ata_scsi_rbuf;
1913}
1914
1915/**
1916 * ata_scsi_rbuf_put - Unmap response buffer.
1917 * @cmd: SCSI command containing buffer to be unmapped.
1918 * @copy_out: copy out result
1919 * @flags: @flags passed to ata_scsi_rbuf_get()
1920 *
1921 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1922 * @copy_back is true.
1923 *
1924 * LOCKING:
1925 * Unlocks ata_scsi_rbuf_lock.
1926 */
1927static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1928 unsigned long *flags)
1929{
1930 if (copy_out)
1931 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1932 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1933 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1934}
1935
1936/**
1937 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1938 * @args: device IDENTIFY data / SCSI command of interest.
1939 * @actor: Callback hook for desired SCSI command simulator
1940 *
1941 * Takes care of the hard work of simulating a SCSI command...
1942 * Mapping the response buffer, calling the command's handler,
1943 * and handling the handler's return value. This return value
1944 * indicates whether the handler wishes the SCSI command to be
1945 * completed successfully (0), or not (in which case cmd->result
1946 * and sense buffer are assumed to be set).
1947 *
1948 * LOCKING:
1949 * spin_lock_irqsave(host lock)
1950 */
1951static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1952 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1953{
1954 u8 *rbuf;
1955 unsigned int rc;
1956 struct scsi_cmnd *cmd = args->cmd;
1957 unsigned long flags;
1958
1959 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1960 rc = actor(args, rbuf);
1961 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1962
1963 if (rc == 0)
1964 cmd->result = SAM_STAT_GOOD;
1965 args->done(cmd);
1966}
1967
1968/**
1969 * ata_scsiop_inq_std - Simulate INQUIRY command
1970 * @args: device IDENTIFY data / SCSI command of interest.
1971 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1972 *
1973 * Returns standard device identification data associated
1974 * with non-VPD INQUIRY command output.
1975 *
1976 * LOCKING:
1977 * spin_lock_irqsave(host lock)
1978 */
1979static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1980{
1981 const u8 versions[] = {
1982 0x00,
1983 0x60, /* SAM-3 (no version claimed) */
1984
1985 0x03,
1986 0x20, /* SBC-2 (no version claimed) */
1987
1988 0x02,
1989 0x60 /* SPC-3 (no version claimed) */
1990 };
1991 const u8 versions_zbc[] = {
1992 0x00,
1993 0xA0, /* SAM-5 (no version claimed) */
1994
1995 0x04,
1996 0xC0, /* SBC-3 (no version claimed) */
1997
1998 0x04,
1999 0x60, /* SPC-4 (no version claimed) */
2000
2001 0x60,
2002 0x20, /* ZBC (no version claimed) */
2003 };
2004
2005 u8 hdr[] = {
2006 TYPE_DISK,
2007 0,
2008 0x5, /* claim SPC-3 version compatibility */
2009 2,
2010 95 - 4
2011 };
2012
2013 VPRINTK("ENTER\n");
2014
2015 /* set scsi removable (RMB) bit per ata bit, or if the
2016 * AHCI port says it's external (Hotplug-capable, eSATA).
2017 */
2018 if (ata_id_removable(args->id) ||
2019 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
2020 hdr[1] |= (1 << 7);
2021
2022 if (args->dev->class == ATA_DEV_ZAC) {
2023 hdr[0] = TYPE_ZBC;
2024 hdr[2] = 0x6; /* ZBC is defined in SPC-4 */
2025 }
2026
2027 memcpy(rbuf, hdr, sizeof(hdr));
2028 memcpy(&rbuf[8], "ATA ", 8);
2029 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
2030
2031 /* From SAT, use last 2 words from fw rev unless they are spaces */
2032 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
2033 if (strncmp(&rbuf[32], " ", 4) == 0)
2034 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
2035
2036 if (rbuf[32] == 0 || rbuf[32] == ' ')
2037 memcpy(&rbuf[32], "n/a ", 4);
2038
2039 if (args->dev->class == ATA_DEV_ZAC)
2040 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
2041 else
2042 memcpy(rbuf + 58, versions, sizeof(versions));
2043
2044 return 0;
2045}
2046
2047/**
2048 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
2049 * @args: device IDENTIFY data / SCSI command of interest.
2050 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2051 *
2052 * Returns list of inquiry VPD pages available.
2053 *
2054 * LOCKING:
2055 * spin_lock_irqsave(host lock)
2056 */
2057static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
2058{
2059 const u8 pages[] = {
2060 0x00, /* page 0x00, this page */
2061 0x80, /* page 0x80, unit serial no page */
2062 0x83, /* page 0x83, device ident page */
2063 0x89, /* page 0x89, ata info page */
2064 0xb0, /* page 0xb0, block limits page */
2065 0xb1, /* page 0xb1, block device characteristics page */
2066 0xb2, /* page 0xb2, thin provisioning page */
2067 };
2068
2069 rbuf[3] = sizeof(pages); /* number of supported VPD pages */
2070 memcpy(rbuf + 4, pages, sizeof(pages));
2071 return 0;
2072}
2073
2074/**
2075 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
2076 * @args: device IDENTIFY data / SCSI command of interest.
2077 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2078 *
2079 * Returns ATA device serial number.
2080 *
2081 * LOCKING:
2082 * spin_lock_irqsave(host lock)
2083 */
2084static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
2085{
2086 const u8 hdr[] = {
2087 0,
2088 0x80, /* this page code */
2089 0,
2090 ATA_ID_SERNO_LEN, /* page len */
2091 };
2092
2093 memcpy(rbuf, hdr, sizeof(hdr));
2094 ata_id_string(args->id, (unsigned char *) &rbuf[4],
2095 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2096 return 0;
2097}
2098
2099/**
2100 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
2101 * @args: device IDENTIFY data / SCSI command of interest.
2102 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2103 *
2104 * Yields two logical unit device identification designators:
2105 * - vendor specific ASCII containing the ATA serial number
2106 * - SAT defined "t10 vendor id based" containing ASCII vendor
2107 * name ("ATA "), model and serial numbers.
2108 *
2109 * LOCKING:
2110 * spin_lock_irqsave(host lock)
2111 */
2112static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2113{
2114 const int sat_model_serial_desc_len = 68;
2115 int num;
2116
2117 rbuf[1] = 0x83; /* this page code */
2118 num = 4;
2119
2120 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2121 rbuf[num + 0] = 2;
2122 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2123 num += 4;
2124 ata_id_string(args->id, (unsigned char *) rbuf + num,
2125 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2126 num += ATA_ID_SERNO_LEN;
2127
2128 /* SAT defined lu model and serial numbers descriptor */
2129 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2130 rbuf[num + 0] = 2;
2131 rbuf[num + 1] = 1;
2132 rbuf[num + 3] = sat_model_serial_desc_len;
2133 num += 4;
2134 memcpy(rbuf + num, "ATA ", 8);
2135 num += 8;
2136 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2137 ATA_ID_PROD_LEN);
2138 num += ATA_ID_PROD_LEN;
2139 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2140 ATA_ID_SERNO_LEN);
2141 num += ATA_ID_SERNO_LEN;
2142
2143 if (ata_id_has_wwn(args->id)) {
2144 /* SAT defined lu world wide name */
2145 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2146 rbuf[num + 0] = 1;
2147 rbuf[num + 1] = 3;
2148 rbuf[num + 3] = ATA_ID_WWN_LEN;
2149 num += 4;
2150 ata_id_string(args->id, (unsigned char *) rbuf + num,
2151 ATA_ID_WWN, ATA_ID_WWN_LEN);
2152 num += ATA_ID_WWN_LEN;
2153 }
2154 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2155 return 0;
2156}
2157
2158/**
2159 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2160 * @args: device IDENTIFY data / SCSI command of interest.
2161 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2162 *
2163 * Yields SAT-specified ATA VPD page.
2164 *
2165 * LOCKING:
2166 * spin_lock_irqsave(host lock)
2167 */
2168static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2169{
2170 struct ata_taskfile tf;
2171
2172 memset(&tf, 0, sizeof(tf));
2173
2174 rbuf[1] = 0x89; /* our page code */
2175 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2176 rbuf[3] = (0x238 & 0xff);
2177
2178 memcpy(&rbuf[8], "linux ", 8);
2179 memcpy(&rbuf[16], "libata ", 16);
2180 memcpy(&rbuf[32], DRV_VERSION, 4);
2181
2182 /* we don't store the ATA device signature, so we fake it */
2183
2184 tf.command = ATA_DRDY; /* really, this is Status reg */
2185 tf.lbal = 0x1;
2186 tf.nsect = 0x1;
2187
2188 ata_tf_to_fis(&tf, 0, 1, &rbuf[36]); /* TODO: PMP? */
2189 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2190
2191 rbuf[56] = ATA_CMD_ID_ATA;
2192
2193 memcpy(&rbuf[60], &args->id[0], 512);
2194 return 0;
2195}
2196
2197static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2198{
2199 u16 min_io_sectors;
2200
2201 rbuf[1] = 0xb0;
2202 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2203
2204 /*
2205 * Optimal transfer length granularity.
2206 *
2207 * This is always one physical block, but for disks with a smaller
2208 * logical than physical sector size we need to figure out what the
2209 * latter is.
2210 */
2211 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2212 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2213
2214 /*
2215 * Optimal unmap granularity.
2216 *
2217 * The ATA spec doesn't even know about a granularity or alignment
2218 * for the TRIM command. We can leave away most of the unmap related
2219 * VPD page entries, but we have specifify a granularity to signal
2220 * that we support some form of unmap - in thise case via WRITE SAME
2221 * with the unmap bit set.
2222 */
2223 if (ata_id_has_trim(args->id)) {
2224 put_unaligned_be64(65535 * 512 / 8, &rbuf[36]);
2225 put_unaligned_be32(1, &rbuf[28]);
2226 }
2227
2228 return 0;
2229}
2230
2231static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2232{
2233 int form_factor = ata_id_form_factor(args->id);
2234 int media_rotation_rate = ata_id_rotation_rate(args->id);
2235
2236 rbuf[1] = 0xb1;
2237 rbuf[3] = 0x3c;
2238 rbuf[4] = media_rotation_rate >> 8;
2239 rbuf[5] = media_rotation_rate;
2240 rbuf[7] = form_factor;
2241
2242 return 0;
2243}
2244
2245static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2246{
2247 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2248 rbuf[1] = 0xb2;
2249 rbuf[3] = 0x4;
2250 rbuf[5] = 1 << 6; /* TPWS */
2251
2252 return 0;
2253}
2254
2255/**
2256 * ata_scsiop_noop - Command handler that simply returns success.
2257 * @args: device IDENTIFY data / SCSI command of interest.
2258 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2259 *
2260 * No operation. Simply returns success to caller, to indicate
2261 * that the caller should successfully complete this SCSI command.
2262 *
2263 * LOCKING:
2264 * spin_lock_irqsave(host lock)
2265 */
2266static unsigned int ata_scsiop_noop(struct ata_scsi_args *args, u8 *rbuf)
2267{
2268 VPRINTK("ENTER\n");
2269 return 0;
2270}
2271
2272/**
2273 * modecpy - Prepare response for MODE SENSE
2274 * @dest: output buffer
2275 * @src: data being copied
2276 * @n: length of mode page
2277 * @changeable: whether changeable parameters are requested
2278 *
2279 * Generate a generic MODE SENSE page for either current or changeable
2280 * parameters.
2281 *
2282 * LOCKING:
2283 * None.
2284 */
2285static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2286{
2287 if (changeable) {
2288 memcpy(dest, src, 2);
2289 memset(dest + 2, 0, n - 2);
2290 } else {
2291 memcpy(dest, src, n);
2292 }
2293}
2294
2295/**
2296 * ata_msense_caching - Simulate MODE SENSE caching info page
2297 * @id: device IDENTIFY data
2298 * @buf: output buffer
2299 * @changeable: whether changeable parameters are requested
2300 *
2301 * Generate a caching info page, which conditionally indicates
2302 * write caching to the SCSI layer, depending on device
2303 * capabilities.
2304 *
2305 * LOCKING:
2306 * None.
2307 */
2308static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2309{
2310 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2311 if (changeable || ata_id_wcache_enabled(id))
2312 buf[2] |= (1 << 2); /* write cache enable */
2313 if (!changeable && !ata_id_rahead_enabled(id))
2314 buf[12] |= (1 << 5); /* disable read ahead */
2315 return sizeof(def_cache_mpage);
2316}
2317
2318/**
2319 * ata_msense_ctl_mode - Simulate MODE SENSE control mode page
2320 * @buf: output buffer
2321 * @changeable: whether changeable parameters are requested
2322 *
2323 * Generate a generic MODE SENSE control mode page.
2324 *
2325 * LOCKING:
2326 * None.
2327 */
2328static unsigned int ata_msense_ctl_mode(u8 *buf, bool changeable)
2329{
2330 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2331 return sizeof(def_control_mpage);
2332}
2333
2334/**
2335 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2336 * @buf: output buffer
2337 * @changeable: whether changeable parameters are requested
2338 *
2339 * Generate a generic MODE SENSE r/w error recovery page.
2340 *
2341 * LOCKING:
2342 * None.
2343 */
2344static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2345{
2346 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2347 changeable);
2348 return sizeof(def_rw_recovery_mpage);
2349}
2350
2351/*
2352 * We can turn this into a real blacklist if it's needed, for now just
2353 * blacklist any Maxtor BANC1G10 revision firmware
2354 */
2355static int ata_dev_supports_fua(u16 *id)
2356{
2357 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2358
2359 if (!libata_fua)
2360 return 0;
2361 if (!ata_id_has_fua(id))
2362 return 0;
2363
2364 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2365 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2366
2367 if (strcmp(model, "Maxtor"))
2368 return 1;
2369 if (strcmp(fw, "BANC1G10"))
2370 return 1;
2371
2372 return 0; /* blacklisted */
2373}
2374
2375/**
2376 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2377 * @args: device IDENTIFY data / SCSI command of interest.
2378 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2379 *
2380 * Simulate MODE SENSE commands. Assume this is invoked for direct
2381 * access devices (e.g. disks) only. There should be no block
2382 * descriptor for other device types.
2383 *
2384 * LOCKING:
2385 * spin_lock_irqsave(host lock)
2386 */
2387static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2388{
2389 struct ata_device *dev = args->dev;
2390 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2391 const u8 sat_blk_desc[] = {
2392 0, 0, 0, 0, /* number of blocks: sat unspecified */
2393 0,
2394 0, 0x2, 0x0 /* block length: 512 bytes */
2395 };
2396 u8 pg, spg;
2397 unsigned int ebd, page_control, six_byte;
2398 u8 dpofua;
2399
2400 VPRINTK("ENTER\n");
2401
2402 six_byte = (scsicmd[0] == MODE_SENSE);
2403 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2404 /*
2405 * LLBA bit in msense(10) ignored (compliant)
2406 */
2407
2408 page_control = scsicmd[2] >> 6;
2409 switch (page_control) {
2410 case 0: /* current */
2411 case 1: /* changeable */
2412 case 2: /* defaults */
2413 break; /* supported */
2414 case 3: /* saved */
2415 goto saving_not_supp;
2416 default:
2417 goto invalid_fld;
2418 }
2419
2420 if (six_byte)
2421 p += 4 + (ebd ? 8 : 0);
2422 else
2423 p += 8 + (ebd ? 8 : 0);
2424
2425 pg = scsicmd[2] & 0x3f;
2426 spg = scsicmd[3];
2427 /*
2428 * No mode subpages supported (yet) but asking for _all_
2429 * subpages may be valid
2430 */
2431 if (spg && (spg != ALL_SUB_MPAGES))
2432 goto invalid_fld;
2433
2434 switch(pg) {
2435 case RW_RECOVERY_MPAGE:
2436 p += ata_msense_rw_recovery(p, page_control == 1);
2437 break;
2438
2439 case CACHE_MPAGE:
2440 p += ata_msense_caching(args->id, p, page_control == 1);
2441 break;
2442
2443 case CONTROL_MPAGE:
2444 p += ata_msense_ctl_mode(p, page_control == 1);
2445 break;
2446
2447 case ALL_MPAGES:
2448 p += ata_msense_rw_recovery(p, page_control == 1);
2449 p += ata_msense_caching(args->id, p, page_control == 1);
2450 p += ata_msense_ctl_mode(p, page_control == 1);
2451 break;
2452
2453 default: /* invalid page code */
2454 goto invalid_fld;
2455 }
2456
2457 dpofua = 0;
2458 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2459 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2460 dpofua = 1 << 4;
2461
2462 if (six_byte) {
2463 rbuf[0] = p - rbuf - 1;
2464 rbuf[2] |= dpofua;
2465 if (ebd) {
2466 rbuf[3] = sizeof(sat_blk_desc);
2467 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2468 }
2469 } else {
2470 unsigned int output_len = p - rbuf - 2;
2471
2472 rbuf[0] = output_len >> 8;
2473 rbuf[1] = output_len;
2474 rbuf[3] |= dpofua;
2475 if (ebd) {
2476 rbuf[7] = sizeof(sat_blk_desc);
2477 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2478 }
2479 }
2480 return 0;
2481
2482invalid_fld:
2483 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x24, 0x0);
2484 /* "Invalid field in cbd" */
2485 return 1;
2486
2487saving_not_supp:
2488 ata_scsi_set_sense(args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2489 /* "Saving parameters not supported" */
2490 return 1;
2491}
2492
2493/**
2494 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2495 * @args: device IDENTIFY data / SCSI command of interest.
2496 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2497 *
2498 * Simulate READ CAPACITY commands.
2499 *
2500 * LOCKING:
2501 * None.
2502 */
2503static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2504{
2505 struct ata_device *dev = args->dev;
2506 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2507 u32 sector_size; /* physical sector size in bytes */
2508 u8 log2_per_phys;
2509 u16 lowest_aligned;
2510
2511 sector_size = ata_id_logical_sector_size(dev->id);
2512 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2513 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2514
2515 VPRINTK("ENTER\n");
2516
2517 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2518 if (last_lba >= 0xffffffffULL)
2519 last_lba = 0xffffffff;
2520
2521 /* sector count, 32-bit */
2522 rbuf[0] = last_lba >> (8 * 3);
2523 rbuf[1] = last_lba >> (8 * 2);
2524 rbuf[2] = last_lba >> (8 * 1);
2525 rbuf[3] = last_lba;
2526
2527 /* sector size */
2528 rbuf[4] = sector_size >> (8 * 3);
2529 rbuf[5] = sector_size >> (8 * 2);
2530 rbuf[6] = sector_size >> (8 * 1);
2531 rbuf[7] = sector_size;
2532 } else {
2533 /* sector count, 64-bit */
2534 rbuf[0] = last_lba >> (8 * 7);
2535 rbuf[1] = last_lba >> (8 * 6);
2536 rbuf[2] = last_lba >> (8 * 5);
2537 rbuf[3] = last_lba >> (8 * 4);
2538 rbuf[4] = last_lba >> (8 * 3);
2539 rbuf[5] = last_lba >> (8 * 2);
2540 rbuf[6] = last_lba >> (8 * 1);
2541 rbuf[7] = last_lba;
2542
2543 /* sector size */
2544 rbuf[ 8] = sector_size >> (8 * 3);
2545 rbuf[ 9] = sector_size >> (8 * 2);
2546 rbuf[10] = sector_size >> (8 * 1);
2547 rbuf[11] = sector_size;
2548
2549 rbuf[12] = 0;
2550 rbuf[13] = log2_per_phys;
2551 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2552 rbuf[15] = lowest_aligned;
2553
2554 if (ata_id_has_trim(args->id) &&
2555 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
2556 rbuf[14] |= 0x80; /* LBPME */
2557
2558 if (ata_id_has_zero_after_trim(args->id) &&
2559 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
2560 ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2561 rbuf[14] |= 0x40; /* LBPRZ */
2562 }
2563 }
2564 }
2565 return 0;
2566}
2567
2568/**
2569 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2570 * @args: device IDENTIFY data / SCSI command of interest.
2571 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2572 *
2573 * Simulate REPORT LUNS command.
2574 *
2575 * LOCKING:
2576 * spin_lock_irqsave(host lock)
2577 */
2578static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2579{
2580 VPRINTK("ENTER\n");
2581 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2582
2583 return 0;
2584}
2585
2586static void atapi_sense_complete(struct ata_queued_cmd *qc)
2587{
2588 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2589 /* FIXME: not quite right; we don't want the
2590 * translation of taskfile registers into
2591 * a sense descriptors, since that's only
2592 * correct for ATA, not ATAPI
2593 */
2594 ata_gen_passthru_sense(qc);
2595 }
2596
2597 ata_qc_done(qc);
2598}
2599
2600/* is it pointless to prefer PIO for "safety reasons"? */
2601static inline int ata_pio_use_silly(struct ata_port *ap)
2602{
2603 return (ap->flags & ATA_FLAG_PIO_DMA);
2604}
2605
2606static void atapi_request_sense(struct ata_queued_cmd *qc)
2607{
2608 struct ata_port *ap = qc->ap;
2609 struct scsi_cmnd *cmd = qc->scsicmd;
2610
2611 DPRINTK("ATAPI request sense\n");
2612
2613 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2614
2615#ifdef CONFIG_ATA_SFF
2616 if (ap->ops->sff_tf_read)
2617 ap->ops->sff_tf_read(ap, &qc->tf);
2618#endif
2619
2620 /* fill these in, for the case where they are -not- overwritten */
2621 cmd->sense_buffer[0] = 0x70;
2622 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2623
2624 ata_qc_reinit(qc);
2625
2626 /* setup sg table and init transfer direction */
2627 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2628 ata_sg_init(qc, &qc->sgent, 1);
2629 qc->dma_dir = DMA_FROM_DEVICE;
2630
2631 memset(&qc->cdb, 0, qc->dev->cdb_len);
2632 qc->cdb[0] = REQUEST_SENSE;
2633 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2634
2635 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2636 qc->tf.command = ATA_CMD_PACKET;
2637
2638 if (ata_pio_use_silly(ap)) {
2639 qc->tf.protocol = ATAPI_PROT_DMA;
2640 qc->tf.feature |= ATAPI_PKT_DMA;
2641 } else {
2642 qc->tf.protocol = ATAPI_PROT_PIO;
2643 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2644 qc->tf.lbah = 0;
2645 }
2646 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2647
2648 qc->complete_fn = atapi_sense_complete;
2649
2650 ata_qc_issue(qc);
2651
2652 DPRINTK("EXIT\n");
2653}
2654
2655static void atapi_qc_complete(struct ata_queued_cmd *qc)
2656{
2657 struct scsi_cmnd *cmd = qc->scsicmd;
2658 unsigned int err_mask = qc->err_mask;
2659
2660 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2661
2662 /* handle completion from new EH */
2663 if (unlikely(qc->ap->ops->error_handler &&
2664 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2665
2666 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2667 /* FIXME: not quite right; we don't want the
2668 * translation of taskfile registers into a
2669 * sense descriptors, since that's only
2670 * correct for ATA, not ATAPI
2671 */
2672 ata_gen_passthru_sense(qc);
2673 }
2674
2675 /* SCSI EH automatically locks door if sdev->locked is
2676 * set. Sometimes door lock request continues to
2677 * fail, for example, when no media is present. This
2678 * creates a loop - SCSI EH issues door lock which
2679 * fails and gets invoked again to acquire sense data
2680 * for the failed command.
2681 *
2682 * If door lock fails, always clear sdev->locked to
2683 * avoid this infinite loop.
2684 *
2685 * This may happen before SCSI scan is complete. Make
2686 * sure qc->dev->sdev isn't NULL before dereferencing.
2687 */
2688 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2689 qc->dev->sdev->locked = 0;
2690
2691 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2692 ata_qc_done(qc);
2693 return;
2694 }
2695
2696 /* successful completion or old EH failure path */
2697 if (unlikely(err_mask & AC_ERR_DEV)) {
2698 cmd->result = SAM_STAT_CHECK_CONDITION;
2699 atapi_request_sense(qc);
2700 return;
2701 } else if (unlikely(err_mask)) {
2702 /* FIXME: not quite right; we don't want the
2703 * translation of taskfile registers into
2704 * a sense descriptors, since that's only
2705 * correct for ATA, not ATAPI
2706 */
2707 ata_gen_passthru_sense(qc);
2708 } else {
2709 u8 *scsicmd = cmd->cmnd;
2710
2711 if ((scsicmd[0] == INQUIRY) && ((scsicmd[1] & 0x03) == 0)) {
2712 unsigned long flags;
2713 u8 *buf;
2714
2715 buf = ata_scsi_rbuf_get(cmd, true, &flags);
2716
2717 /* ATAPI devices typically report zero for their SCSI version,
2718 * and sometimes deviate from the spec WRT response data
2719 * format. If SCSI version is reported as zero like normal,
2720 * then we make the following fixups: 1) Fake MMC-5 version,
2721 * to indicate to the Linux scsi midlayer this is a modern
2722 * device. 2) Ensure response data format / ATAPI information
2723 * are always correct.
2724 */
2725 if (buf[2] == 0) {
2726 buf[2] = 0x5;
2727 buf[3] = 0x32;
2728 }
2729
2730 ata_scsi_rbuf_put(cmd, true, &flags);
2731 }
2732
2733 cmd->result = SAM_STAT_GOOD;
2734 }
2735
2736 ata_qc_done(qc);
2737}
2738/**
2739 * atapi_xlat - Initialize PACKET taskfile
2740 * @qc: command structure to be initialized
2741 *
2742 * LOCKING:
2743 * spin_lock_irqsave(host lock)
2744 *
2745 * RETURNS:
2746 * Zero on success, non-zero on failure.
2747 */
2748static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2749{
2750 struct scsi_cmnd *scmd = qc->scsicmd;
2751 struct ata_device *dev = qc->dev;
2752 int nodata = (scmd->sc_data_direction == DMA_NONE);
2753 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2754 unsigned int nbytes;
2755
2756 memset(qc->cdb, 0, dev->cdb_len);
2757 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2758
2759 qc->complete_fn = atapi_qc_complete;
2760
2761 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2762 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2763 qc->tf.flags |= ATA_TFLAG_WRITE;
2764 DPRINTK("direction: write\n");
2765 }
2766
2767 qc->tf.command = ATA_CMD_PACKET;
2768 ata_qc_set_pc_nbytes(qc);
2769
2770 /* check whether ATAPI DMA is safe */
2771 if (!nodata && !using_pio && atapi_check_dma(qc))
2772 using_pio = 1;
2773
2774 /* Some controller variants snoop this value for Packet
2775 * transfers to do state machine and FIFO management. Thus we
2776 * want to set it properly, and for DMA where it is
2777 * effectively meaningless.
2778 */
2779 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2780
2781 /* Most ATAPI devices which honor transfer chunk size don't
2782 * behave according to the spec when odd chunk size which
2783 * matches the transfer length is specified. If the number of
2784 * bytes to transfer is 2n+1. According to the spec, what
2785 * should happen is to indicate that 2n+1 is going to be
2786 * transferred and transfer 2n+2 bytes where the last byte is
2787 * padding.
2788 *
2789 * In practice, this doesn't happen. ATAPI devices first
2790 * indicate and transfer 2n bytes and then indicate and
2791 * transfer 2 bytes where the last byte is padding.
2792 *
2793 * This inconsistency confuses several controllers which
2794 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2795 * These controllers use actual number of transferred bytes to
2796 * update DMA poitner and transfer of 4n+2 bytes make those
2797 * controller push DMA pointer by 4n+4 bytes because SATA data
2798 * FISes are aligned to 4 bytes. This causes data corruption
2799 * and buffer overrun.
2800 *
2801 * Always setting nbytes to even number solves this problem
2802 * because then ATAPI devices don't have to split data at 2n
2803 * boundaries.
2804 */
2805 if (nbytes & 0x1)
2806 nbytes++;
2807
2808 qc->tf.lbam = (nbytes & 0xFF);
2809 qc->tf.lbah = (nbytes >> 8);
2810
2811 if (nodata)
2812 qc->tf.protocol = ATAPI_PROT_NODATA;
2813 else if (using_pio)
2814 qc->tf.protocol = ATAPI_PROT_PIO;
2815 else {
2816 /* DMA data xfer */
2817 qc->tf.protocol = ATAPI_PROT_DMA;
2818 qc->tf.feature |= ATAPI_PKT_DMA;
2819
2820 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2821 (scmd->sc_data_direction != DMA_TO_DEVICE))
2822 /* some SATA bridges need us to indicate data xfer direction */
2823 qc->tf.feature |= ATAPI_DMADIR;
2824 }
2825
2826
2827 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2828 as ATAPI tape drives don't get this right otherwise */
2829 return 0;
2830}
2831
2832static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2833{
2834 if (!sata_pmp_attached(ap)) {
2835 if (likely(devno < ata_link_max_devices(&ap->link)))
2836 return &ap->link.device[devno];
2837 } else {
2838 if (likely(devno < ap->nr_pmp_links))
2839 return &ap->pmp_link[devno].device[0];
2840 }
2841
2842 return NULL;
2843}
2844
2845static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2846 const struct scsi_device *scsidev)
2847{
2848 int devno;
2849
2850 /* skip commands not addressed to targets we simulate */
2851 if (!sata_pmp_attached(ap)) {
2852 if (unlikely(scsidev->channel || scsidev->lun))
2853 return NULL;
2854 devno = scsidev->id;
2855 } else {
2856 if (unlikely(scsidev->id || scsidev->lun))
2857 return NULL;
2858 devno = scsidev->channel;
2859 }
2860
2861 return ata_find_dev(ap, devno);
2862}
2863
2864/**
2865 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2866 * @ap: ATA port to which the device is attached
2867 * @scsidev: SCSI device from which we derive the ATA device
2868 *
2869 * Given various information provided in struct scsi_cmnd,
2870 * map that onto an ATA bus, and using that mapping
2871 * determine which ata_device is associated with the
2872 * SCSI command to be sent.
2873 *
2874 * LOCKING:
2875 * spin_lock_irqsave(host lock)
2876 *
2877 * RETURNS:
2878 * Associated ATA device, or %NULL if not found.
2879 */
2880static struct ata_device *
2881ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2882{
2883 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2884
2885 if (unlikely(!dev || !ata_dev_enabled(dev)))
2886 return NULL;
2887
2888 return dev;
2889}
2890
2891/*
2892 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2893 * @byte1: Byte 1 from pass-thru CDB.
2894 *
2895 * RETURNS:
2896 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2897 */
2898static u8
2899ata_scsi_map_proto(u8 byte1)
2900{
2901 switch((byte1 & 0x1e) >> 1) {
2902 case 3: /* Non-data */
2903 return ATA_PROT_NODATA;
2904
2905 case 6: /* DMA */
2906 case 10: /* UDMA Data-in */
2907 case 11: /* UDMA Data-Out */
2908 return ATA_PROT_DMA;
2909
2910 case 4: /* PIO Data-in */
2911 case 5: /* PIO Data-out */
2912 return ATA_PROT_PIO;
2913
2914 case 12: /* FPDMA */
2915 return ATA_PROT_NCQ;
2916
2917 case 0: /* Hard Reset */
2918 case 1: /* SRST */
2919 case 8: /* Device Diagnostic */
2920 case 9: /* Device Reset */
2921 case 7: /* DMA Queued */
2922 case 15: /* Return Response Info */
2923 default: /* Reserved */
2924 break;
2925 }
2926
2927 return ATA_PROT_UNKNOWN;
2928}
2929
2930/**
2931 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2932 * @qc: command structure to be initialized
2933 *
2934 * Handles either 12 or 16-byte versions of the CDB.
2935 *
2936 * RETURNS:
2937 * Zero on success, non-zero on failure.
2938 */
2939static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2940{
2941 struct ata_taskfile *tf = &(qc->tf);
2942 struct scsi_cmnd *scmd = qc->scsicmd;
2943 struct ata_device *dev = qc->dev;
2944 const u8 *cdb = scmd->cmnd;
2945
2946 if ((tf->protocol = ata_scsi_map_proto(cdb[1])) == ATA_PROT_UNKNOWN)
2947 goto invalid_fld;
2948
2949 /* enable LBA */
2950 tf->flags |= ATA_TFLAG_LBA;
2951
2952 /*
2953 * 12 and 16 byte CDBs use different offsets to
2954 * provide the various register values.
2955 */
2956 if (cdb[0] == ATA_16) {
2957 /*
2958 * 16-byte CDB - may contain extended commands.
2959 *
2960 * If that is the case, copy the upper byte register values.
2961 */
2962 if (cdb[1] & 0x01) {
2963 tf->hob_feature = cdb[3];
2964 tf->hob_nsect = cdb[5];
2965 tf->hob_lbal = cdb[7];
2966 tf->hob_lbam = cdb[9];
2967 tf->hob_lbah = cdb[11];
2968 tf->flags |= ATA_TFLAG_LBA48;
2969 } else
2970 tf->flags &= ~ATA_TFLAG_LBA48;
2971
2972 /*
2973 * Always copy low byte, device and command registers.
2974 */
2975 tf->feature = cdb[4];
2976 tf->nsect = cdb[6];
2977 tf->lbal = cdb[8];
2978 tf->lbam = cdb[10];
2979 tf->lbah = cdb[12];
2980 tf->device = cdb[13];
2981 tf->command = cdb[14];
2982 } else {
2983 /*
2984 * 12-byte CDB - incapable of extended commands.
2985 */
2986 tf->flags &= ~ATA_TFLAG_LBA48;
2987
2988 tf->feature = cdb[3];
2989 tf->nsect = cdb[4];
2990 tf->lbal = cdb[5];
2991 tf->lbam = cdb[6];
2992 tf->lbah = cdb[7];
2993 tf->device = cdb[8];
2994 tf->command = cdb[9];
2995 }
2996
2997 /* For NCQ commands with FPDMA protocol, copy the tag value */
2998 if (tf->protocol == ATA_PROT_NCQ)
2999 tf->nsect = qc->tag << 3;
3000
3001 /* enforce correct master/slave bit */
3002 tf->device = dev->devno ?
3003 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
3004
3005 switch (tf->command) {
3006 /* READ/WRITE LONG use a non-standard sect_size */
3007 case ATA_CMD_READ_LONG:
3008 case ATA_CMD_READ_LONG_ONCE:
3009 case ATA_CMD_WRITE_LONG:
3010 case ATA_CMD_WRITE_LONG_ONCE:
3011 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1)
3012 goto invalid_fld;
3013 qc->sect_size = scsi_bufflen(scmd);
3014 break;
3015
3016 /* commands using reported Logical Block size (e.g. 512 or 4K) */
3017 case ATA_CMD_CFA_WRITE_NE:
3018 case ATA_CMD_CFA_TRANS_SECT:
3019 case ATA_CMD_CFA_WRITE_MULT_NE:
3020 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
3021 case ATA_CMD_READ:
3022 case ATA_CMD_READ_EXT:
3023 case ATA_CMD_READ_QUEUED:
3024 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
3025 case ATA_CMD_FPDMA_READ:
3026 case ATA_CMD_READ_MULTI:
3027 case ATA_CMD_READ_MULTI_EXT:
3028 case ATA_CMD_PIO_READ:
3029 case ATA_CMD_PIO_READ_EXT:
3030 case ATA_CMD_READ_STREAM_DMA_EXT:
3031 case ATA_CMD_READ_STREAM_EXT:
3032 case ATA_CMD_VERIFY:
3033 case ATA_CMD_VERIFY_EXT:
3034 case ATA_CMD_WRITE:
3035 case ATA_CMD_WRITE_EXT:
3036 case ATA_CMD_WRITE_FUA_EXT:
3037 case ATA_CMD_WRITE_QUEUED:
3038 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
3039 case ATA_CMD_FPDMA_WRITE:
3040 case ATA_CMD_WRITE_MULTI:
3041 case ATA_CMD_WRITE_MULTI_EXT:
3042 case ATA_CMD_WRITE_MULTI_FUA_EXT:
3043 case ATA_CMD_PIO_WRITE:
3044 case ATA_CMD_PIO_WRITE_EXT:
3045 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3046 case ATA_CMD_WRITE_STREAM_EXT:
3047 qc->sect_size = scmd->device->sector_size;
3048 break;
3049
3050 /* Everything else uses 512 byte "sectors" */
3051 default:
3052 qc->sect_size = ATA_SECT_SIZE;
3053 }
3054
3055 /*
3056 * Set flags so that all registers will be written, pass on
3057 * write indication (used for PIO/DMA setup), result TF is
3058 * copied back and we don't whine too much about its failure.
3059 */
3060 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3061 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3062 tf->flags |= ATA_TFLAG_WRITE;
3063
3064 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3065
3066 /*
3067 * Set transfer length.
3068 *
3069 * TODO: find out if we need to do more here to
3070 * cover scatter/gather case.
3071 */
3072 ata_qc_set_pc_nbytes(qc);
3073
3074 /* We may not issue DMA commands if no DMA mode is set */
3075 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0)
3076 goto invalid_fld;
3077
3078 /* sanity check for pio multi commands */
3079 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf))
3080 goto invalid_fld;
3081
3082 if (is_multi_taskfile(tf)) {
3083 unsigned int multi_count = 1 << (cdb[1] >> 5);
3084
3085 /* compare the passed through multi_count
3086 * with the cached multi_count of libata
3087 */
3088 if (multi_count != dev->multi_count)
3089 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3090 multi_count);
3091 }
3092
3093 /*
3094 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3095 * SET_FEATURES - XFER MODE must be preceded/succeeded
3096 * by an update to hardware-specific registers for each
3097 * controller (i.e. the reason for ->set_piomode(),
3098 * ->set_dmamode(), and ->post_set_mode() hooks).
3099 */
3100 if (tf->command == ATA_CMD_SET_FEATURES &&
3101 tf->feature == SETFEATURES_XFER)
3102 goto invalid_fld;
3103
3104 /*
3105 * Filter TPM commands by default. These provide an
3106 * essentially uncontrolled encrypted "back door" between
3107 * applications and the disk. Set libata.allow_tpm=1 if you
3108 * have a real reason for wanting to use them. This ensures
3109 * that installed software cannot easily mess stuff up without
3110 * user intent. DVR type users will probably ship with this enabled
3111 * for movie content management.
3112 *
3113 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3114 * for this and should do in future but that it is not sufficient as
3115 * DCS is an optional feature set. Thus we also do the software filter
3116 * so that we comply with the TC consortium stated goal that the user
3117 * can turn off TC features of their system.
3118 */
3119 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm)
3120 goto invalid_fld;
3121
3122 return 0;
3123
3124 invalid_fld:
3125 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3126 /* "Invalid field in cdb" */
3127 return 1;
3128}
3129
3130static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3131{
3132 struct ata_taskfile *tf = &qc->tf;
3133 struct scsi_cmnd *scmd = qc->scsicmd;
3134 struct ata_device *dev = qc->dev;
3135 const u8 *cdb = scmd->cmnd;
3136 u64 block;
3137 u32 n_block;
3138 u32 size;
3139 void *buf;
3140
3141 /* we may not issue DMA commands if no DMA mode is set */
3142 if (unlikely(!dev->dma_mode))
3143 goto invalid_fld;
3144
3145 if (unlikely(scmd->cmd_len < 16))
3146 goto invalid_fld;
3147 scsi_16_lba_len(cdb, &block, &n_block);
3148
3149 /* for now we only support WRITE SAME with the unmap bit set */
3150 if (unlikely(!(cdb[1] & 0x8)))
3151 goto invalid_fld;
3152
3153 /*
3154 * WRITE SAME always has a sector sized buffer as payload, this
3155 * should never be a multiple entry S/G list.
3156 */
3157 if (!scsi_sg_count(scmd))
3158 goto invalid_fld;
3159
3160 buf = page_address(sg_page(scsi_sglist(scmd)));
3161 size = ata_set_lba_range_entries(buf, 512, block, n_block);
3162
3163 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3164 /* Newer devices support queued TRIM commands */
3165 tf->protocol = ATA_PROT_NCQ;
3166 tf->command = ATA_CMD_FPDMA_SEND;
3167 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3168 tf->nsect = qc->tag << 3;
3169 tf->hob_feature = (size / 512) >> 8;
3170 tf->feature = size / 512;
3171
3172 tf->auxiliary = 1;
3173 } else {
3174 tf->protocol = ATA_PROT_DMA;
3175 tf->hob_feature = 0;
3176 tf->feature = ATA_DSM_TRIM;
3177 tf->hob_nsect = (size / 512) >> 8;
3178 tf->nsect = size / 512;
3179 tf->command = ATA_CMD_DSM;
3180 }
3181
3182 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3183 ATA_TFLAG_WRITE;
3184
3185 ata_qc_set_pc_nbytes(qc);
3186
3187 return 0;
3188
3189 invalid_fld:
3190 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x00);
3191 /* "Invalid field in cdb" */
3192 return 1;
3193}
3194
3195/**
3196 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3197 * @qc: Storage for translated ATA taskfile
3198 * @buf: input buffer
3199 * @len: number of valid bytes in the input buffer
3200 *
3201 * Prepare a taskfile to modify caching information for the device.
3202 *
3203 * LOCKING:
3204 * None.
3205 */
3206static int ata_mselect_caching(struct ata_queued_cmd *qc,
3207 const u8 *buf, int len)
3208{
3209 struct ata_taskfile *tf = &qc->tf;
3210 struct ata_device *dev = qc->dev;
3211 char mpage[CACHE_MPAGE_LEN];
3212 u8 wce;
3213
3214 /*
3215 * The first two bytes of def_cache_mpage are a header, so offsets
3216 * in mpage are off by 2 compared to buf. Same for len.
3217 */
3218
3219 if (len != CACHE_MPAGE_LEN - 2)
3220 return -EINVAL;
3221
3222 wce = buf[0] & (1 << 2);
3223
3224 /*
3225 * Check that read-only bits are not modified.
3226 */
3227 ata_msense_caching(dev->id, mpage, false);
3228 mpage[2] &= ~(1 << 2);
3229 mpage[2] |= wce;
3230 if (memcmp(mpage + 2, buf, CACHE_MPAGE_LEN - 2) != 0)
3231 return -EINVAL;
3232
3233 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3234 tf->protocol = ATA_PROT_NODATA;
3235 tf->nsect = 0;
3236 tf->command = ATA_CMD_SET_FEATURES;
3237 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3238 return 0;
3239}
3240
3241/**
3242 * ata_scsiop_mode_select - Simulate MODE SELECT 6, 10 commands
3243 * @qc: Storage for translated ATA taskfile
3244 *
3245 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3246 * Assume this is invoked for direct access devices (e.g. disks) only.
3247 * There should be no block descriptor for other device types.
3248 *
3249 * LOCKING:
3250 * spin_lock_irqsave(host lock)
3251 */
3252static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3253{
3254 struct scsi_cmnd *scmd = qc->scsicmd;
3255 const u8 *cdb = scmd->cmnd;
3256 const u8 *p;
3257 u8 pg, spg;
3258 unsigned six_byte, pg_len, hdr_len, bd_len;
3259 int len;
3260
3261 VPRINTK("ENTER\n");
3262
3263 six_byte = (cdb[0] == MODE_SELECT);
3264 if (six_byte) {
3265 if (scmd->cmd_len < 5)
3266 goto invalid_fld;
3267
3268 len = cdb[4];
3269 hdr_len = 4;
3270 } else {
3271 if (scmd->cmd_len < 9)
3272 goto invalid_fld;
3273
3274 len = (cdb[7] << 8) + cdb[8];
3275 hdr_len = 8;
3276 }
3277
3278 /* We only support PF=1, SP=0. */
3279 if ((cdb[1] & 0x11) != 0x10)
3280 goto invalid_fld;
3281
3282 /* Test early for possible overrun. */
3283 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3284 goto invalid_param_len;
3285
3286 p = page_address(sg_page(scsi_sglist(scmd)));
3287
3288 /* Move past header and block descriptors. */
3289 if (len < hdr_len)
3290 goto invalid_param_len;
3291
3292 if (six_byte)
3293 bd_len = p[3];
3294 else
3295 bd_len = (p[6] << 8) + p[7];
3296
3297 len -= hdr_len;
3298 p += hdr_len;
3299 if (len < bd_len)
3300 goto invalid_param_len;
3301 if (bd_len != 0 && bd_len != 8)
3302 goto invalid_param;
3303
3304 len -= bd_len;
3305 p += bd_len;
3306 if (len == 0)
3307 goto skip;
3308
3309 /* Parse both possible formats for the mode page headers. */
3310 pg = p[0] & 0x3f;
3311 if (p[0] & 0x40) {
3312 if (len < 4)
3313 goto invalid_param_len;
3314
3315 spg = p[1];
3316 pg_len = (p[2] << 8) | p[3];
3317 p += 4;
3318 len -= 4;
3319 } else {
3320 if (len < 2)
3321 goto invalid_param_len;
3322
3323 spg = 0;
3324 pg_len = p[1];
3325 p += 2;
3326 len -= 2;
3327 }
3328
3329 /*
3330 * No mode subpages supported (yet) but asking for _all_
3331 * subpages may be valid
3332 */
3333 if (spg && (spg != ALL_SUB_MPAGES))
3334 goto invalid_param;
3335 if (pg_len > len)
3336 goto invalid_param_len;
3337
3338 switch (pg) {
3339 case CACHE_MPAGE:
3340 if (ata_mselect_caching(qc, p, pg_len) < 0)
3341 goto invalid_param;
3342 break;
3343
3344 default: /* invalid page code */
3345 goto invalid_param;
3346 }
3347
3348 /*
3349 * Only one page has changeable data, so we only support setting one
3350 * page at a time.
3351 */
3352 if (len > pg_len)
3353 goto invalid_param;
3354
3355 return 0;
3356
3357 invalid_fld:
3358 /* "Invalid field in CDB" */
3359 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x24, 0x0);
3360 return 1;
3361
3362 invalid_param:
3363 /* "Invalid field in parameter list" */
3364 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x26, 0x0);
3365 return 1;
3366
3367 invalid_param_len:
3368 /* "Parameter list length error" */
3369 ata_scsi_set_sense(scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3370 return 1;
3371
3372 skip:
3373 scmd->result = SAM_STAT_GOOD;
3374 return 1;
3375}
3376
3377/**
3378 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3379 * @dev: ATA device
3380 * @cmd: SCSI command opcode to consider
3381 *
3382 * Look up the SCSI command given, and determine whether the
3383 * SCSI command is to be translated or simulated.
3384 *
3385 * RETURNS:
3386 * Pointer to translation function if possible, %NULL if not.
3387 */
3388
3389static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3390{
3391 switch (cmd) {
3392 case READ_6:
3393 case READ_10:
3394 case READ_16:
3395
3396 case WRITE_6:
3397 case WRITE_10:
3398 case WRITE_16:
3399 return ata_scsi_rw_xlat;
3400
3401 case WRITE_SAME_16:
3402 return ata_scsi_write_same_xlat;
3403
3404 case SYNCHRONIZE_CACHE:
3405 if (ata_try_flush_cache(dev))
3406 return ata_scsi_flush_xlat;
3407 break;
3408
3409 case VERIFY:
3410 case VERIFY_16:
3411 return ata_scsi_verify_xlat;
3412
3413 case ATA_12:
3414 case ATA_16:
3415 return ata_scsi_pass_thru;
3416
3417 case MODE_SELECT:
3418 case MODE_SELECT_10:
3419 return ata_scsi_mode_select_xlat;
3420 break;
3421
3422 case START_STOP:
3423 return ata_scsi_start_stop_xlat;
3424 }
3425
3426 return NULL;
3427}
3428
3429/**
3430 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
3431 * @ap: ATA port to which the command was being sent
3432 * @cmd: SCSI command to dump
3433 *
3434 * Prints the contents of a SCSI command via printk().
3435 */
3436
3437static inline void ata_scsi_dump_cdb(struct ata_port *ap,
3438 struct scsi_cmnd *cmd)
3439{
3440#ifdef ATA_DEBUG
3441 struct scsi_device *scsidev = cmd->device;
3442 u8 *scsicmd = cmd->cmnd;
3443
3444 DPRINTK("CDB (%u:%d,%d,%d) %02x %02x %02x %02x %02x %02x %02x %02x %02x\n",
3445 ap->print_id,
3446 scsidev->channel, scsidev->id, scsidev->lun,
3447 scsicmd[0], scsicmd[1], scsicmd[2], scsicmd[3],
3448 scsicmd[4], scsicmd[5], scsicmd[6], scsicmd[7],
3449 scsicmd[8]);
3450#endif
3451}
3452
3453static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
3454 struct ata_device *dev)
3455{
3456 u8 scsi_op = scmd->cmnd[0];
3457 ata_xlat_func_t xlat_func;
3458 int rc = 0;
3459
3460 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
3461 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
3462 goto bad_cdb_len;
3463
3464 xlat_func = ata_get_xlat_func(dev, scsi_op);
3465 } else {
3466 if (unlikely(!scmd->cmd_len))
3467 goto bad_cdb_len;
3468
3469 xlat_func = NULL;
3470 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
3471 /* relay SCSI command to ATAPI device */
3472 int len = COMMAND_SIZE(scsi_op);
3473 if (unlikely(len > scmd->cmd_len || len > dev->cdb_len))
3474 goto bad_cdb_len;
3475
3476 xlat_func = atapi_xlat;
3477 } else {
3478 /* ATA_16 passthru, treat as an ATA command */
3479 if (unlikely(scmd->cmd_len > 16))
3480 goto bad_cdb_len;
3481
3482 xlat_func = ata_get_xlat_func(dev, scsi_op);
3483 }
3484 }
3485
3486 if (xlat_func)
3487 rc = ata_scsi_translate(dev, scmd, xlat_func);
3488 else
3489 ata_scsi_simulate(dev, scmd);
3490
3491 return rc;
3492
3493 bad_cdb_len:
3494 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
3495 scmd->cmd_len, scsi_op, dev->cdb_len);
3496 scmd->result = DID_ERROR << 16;
3497 scmd->scsi_done(scmd);
3498 return 0;
3499}
3500
3501/**
3502 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
3503 * @shost: SCSI host of command to be sent
3504 * @cmd: SCSI command to be sent
3505 *
3506 * In some cases, this function translates SCSI commands into
3507 * ATA taskfiles, and queues the taskfiles to be sent to
3508 * hardware. In other cases, this function simulates a
3509 * SCSI device by evaluating and responding to certain
3510 * SCSI commands. This creates the overall effect of
3511 * ATA and ATAPI devices appearing as SCSI devices.
3512 *
3513 * LOCKING:
3514 * ATA host lock
3515 *
3516 * RETURNS:
3517 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
3518 * 0 otherwise.
3519 */
3520int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
3521{
3522 struct ata_port *ap;
3523 struct ata_device *dev;
3524 struct scsi_device *scsidev = cmd->device;
3525 int rc = 0;
3526 unsigned long irq_flags;
3527
3528 ap = ata_shost_to_port(shost);
3529
3530 spin_lock_irqsave(ap->lock, irq_flags);
3531
3532 ata_scsi_dump_cdb(ap, cmd);
3533
3534 dev = ata_scsi_find_dev(ap, scsidev);
3535 if (likely(dev))
3536 rc = __ata_scsi_queuecmd(cmd, dev);
3537 else {
3538 cmd->result = (DID_BAD_TARGET << 16);
3539 cmd->scsi_done(cmd);
3540 }
3541
3542 spin_unlock_irqrestore(ap->lock, irq_flags);
3543
3544 return rc;
3545}
3546
3547/**
3548 * ata_scsi_simulate - simulate SCSI command on ATA device
3549 * @dev: the target device
3550 * @cmd: SCSI command being sent to device.
3551 *
3552 * Interprets and directly executes a select list of SCSI commands
3553 * that can be handled internally.
3554 *
3555 * LOCKING:
3556 * spin_lock_irqsave(host lock)
3557 */
3558
3559void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
3560{
3561 struct ata_scsi_args args;
3562 const u8 *scsicmd = cmd->cmnd;
3563 u8 tmp8;
3564
3565 args.dev = dev;
3566 args.id = dev->id;
3567 args.cmd = cmd;
3568 args.done = cmd->scsi_done;
3569
3570 switch(scsicmd[0]) {
3571 /* TODO: worth improving? */
3572 case FORMAT_UNIT:
3573 ata_scsi_invalid_field(cmd);
3574 break;
3575
3576 case INQUIRY:
3577 if (scsicmd[1] & 2) /* is CmdDt set? */
3578 ata_scsi_invalid_field(cmd);
3579 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
3580 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
3581 else switch (scsicmd[2]) {
3582 case 0x00:
3583 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
3584 break;
3585 case 0x80:
3586 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
3587 break;
3588 case 0x83:
3589 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
3590 break;
3591 case 0x89:
3592 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
3593 break;
3594 case 0xb0:
3595 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
3596 break;
3597 case 0xb1:
3598 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
3599 break;
3600 case 0xb2:
3601 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
3602 break;
3603 default:
3604 ata_scsi_invalid_field(cmd);
3605 break;
3606 }
3607 break;
3608
3609 case MODE_SENSE:
3610 case MODE_SENSE_10:
3611 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
3612 break;
3613
3614 case READ_CAPACITY:
3615 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3616 break;
3617
3618 case SERVICE_ACTION_IN_16:
3619 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
3620 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
3621 else
3622 ata_scsi_invalid_field(cmd);
3623 break;
3624
3625 case REPORT_LUNS:
3626 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
3627 break;
3628
3629 case REQUEST_SENSE:
3630 ata_scsi_set_sense(cmd, 0, 0, 0);
3631 cmd->result = (DRIVER_SENSE << 24);
3632 cmd->scsi_done(cmd);
3633 break;
3634
3635 /* if we reach this, then writeback caching is disabled,
3636 * turning this into a no-op.
3637 */
3638 case SYNCHRONIZE_CACHE:
3639 /* fall through */
3640
3641 /* no-op's, complete with success */
3642 case REZERO_UNIT:
3643 case SEEK_6:
3644 case SEEK_10:
3645 case TEST_UNIT_READY:
3646 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3647 break;
3648
3649 case SEND_DIAGNOSTIC:
3650 tmp8 = scsicmd[1] & ~(1 << 3);
3651 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
3652 ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
3653 else
3654 ata_scsi_invalid_field(cmd);
3655 break;
3656
3657 /* all other commands */
3658 default:
3659 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
3660 /* "Invalid command operation code" */
3661 cmd->scsi_done(cmd);
3662 break;
3663 }
3664}
3665
3666int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
3667{
3668 int i, rc;
3669
3670 for (i = 0; i < host->n_ports; i++) {
3671 struct ata_port *ap = host->ports[i];
3672 struct Scsi_Host *shost;
3673
3674 rc = -ENOMEM;
3675 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
3676 if (!shost)
3677 goto err_alloc;
3678
3679 shost->eh_noresume = 1;
3680 *(struct ata_port **)&shost->hostdata[0] = ap;
3681 ap->scsi_host = shost;
3682
3683 shost->transportt = ata_scsi_transport_template;
3684 shost->unique_id = ap->print_id;
3685 shost->max_id = 16;
3686 shost->max_lun = 1;
3687 shost->max_channel = 1;
3688 shost->max_cmd_len = 16;
3689 shost->no_write_same = 1;
3690
3691 /* Schedule policy is determined by ->qc_defer()
3692 * callback and it needs to see every deferred qc.
3693 * Set host_blocked to 1 to prevent SCSI midlayer from
3694 * automatically deferring requests.
3695 */
3696 shost->max_host_blocked = 1;
3697
3698 rc = scsi_add_host_with_dma(ap->scsi_host,
3699 &ap->tdev, ap->host->dev);
3700 if (rc)
3701 goto err_add;
3702 }
3703
3704 return 0;
3705
3706 err_add:
3707 scsi_host_put(host->ports[i]->scsi_host);
3708 err_alloc:
3709 while (--i >= 0) {
3710 struct Scsi_Host *shost = host->ports[i]->scsi_host;
3711
3712 scsi_remove_host(shost);
3713 scsi_host_put(shost);
3714 }
3715 return rc;
3716}
3717
3718void ata_scsi_scan_host(struct ata_port *ap, int sync)
3719{
3720 int tries = 5;
3721 struct ata_device *last_failed_dev = NULL;
3722 struct ata_link *link;
3723 struct ata_device *dev;
3724
3725 repeat:
3726 ata_for_each_link(link, ap, EDGE) {
3727 ata_for_each_dev(dev, link, ENABLED) {
3728 struct scsi_device *sdev;
3729 int channel = 0, id = 0;
3730
3731 if (dev->sdev)
3732 continue;
3733
3734 if (ata_is_host_link(link))
3735 id = dev->devno;
3736 else
3737 channel = link->pmp;
3738
3739 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
3740 NULL);
3741 if (!IS_ERR(sdev)) {
3742 dev->sdev = sdev;
3743 scsi_device_put(sdev);
3744 } else {
3745 dev->sdev = NULL;
3746 }
3747 }
3748 }
3749
3750 /* If we scanned while EH was in progress or allocation
3751 * failure occurred, scan would have failed silently. Check
3752 * whether all devices are attached.
3753 */
3754 ata_for_each_link(link, ap, EDGE) {
3755 ata_for_each_dev(dev, link, ENABLED) {
3756 if (!dev->sdev)
3757 goto exit_loop;
3758 }
3759 }
3760 exit_loop:
3761 if (!link)
3762 return;
3763
3764 /* we're missing some SCSI devices */
3765 if (sync) {
3766 /* If caller requested synchrnous scan && we've made
3767 * any progress, sleep briefly and repeat.
3768 */
3769 if (dev != last_failed_dev) {
3770 msleep(100);
3771 last_failed_dev = dev;
3772 goto repeat;
3773 }
3774
3775 /* We might be failing to detect boot device, give it
3776 * a few more chances.
3777 */
3778 if (--tries) {
3779 msleep(100);
3780 goto repeat;
3781 }
3782
3783 ata_port_err(ap,
3784 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
3785 }
3786
3787 queue_delayed_work(system_long_wq, &ap->hotplug_task,
3788 round_jiffies_relative(HZ));
3789}
3790
3791/**
3792 * ata_scsi_offline_dev - offline attached SCSI device
3793 * @dev: ATA device to offline attached SCSI device for
3794 *
3795 * This function is called from ata_eh_hotplug() and responsible
3796 * for taking the SCSI device attached to @dev offline. This
3797 * function is called with host lock which protects dev->sdev
3798 * against clearing.
3799 *
3800 * LOCKING:
3801 * spin_lock_irqsave(host lock)
3802 *
3803 * RETURNS:
3804 * 1 if attached SCSI device exists, 0 otherwise.
3805 */
3806int ata_scsi_offline_dev(struct ata_device *dev)
3807{
3808 if (dev->sdev) {
3809 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
3810 return 1;
3811 }
3812 return 0;
3813}
3814
3815/**
3816 * ata_scsi_remove_dev - remove attached SCSI device
3817 * @dev: ATA device to remove attached SCSI device for
3818 *
3819 * This function is called from ata_eh_scsi_hotplug() and
3820 * responsible for removing the SCSI device attached to @dev.
3821 *
3822 * LOCKING:
3823 * Kernel thread context (may sleep).
3824 */
3825static void ata_scsi_remove_dev(struct ata_device *dev)
3826{
3827 struct ata_port *ap = dev->link->ap;
3828 struct scsi_device *sdev;
3829 unsigned long flags;
3830
3831 /* Alas, we need to grab scan_mutex to ensure SCSI device
3832 * state doesn't change underneath us and thus
3833 * scsi_device_get() always succeeds. The mutex locking can
3834 * be removed if there is __scsi_device_get() interface which
3835 * increments reference counts regardless of device state.
3836 */
3837 mutex_lock(&ap->scsi_host->scan_mutex);
3838 spin_lock_irqsave(ap->lock, flags);
3839
3840 /* clearing dev->sdev is protected by host lock */
3841 sdev = dev->sdev;
3842 dev->sdev = NULL;
3843
3844 if (sdev) {
3845 /* If user initiated unplug races with us, sdev can go
3846 * away underneath us after the host lock and
3847 * scan_mutex are released. Hold onto it.
3848 */
3849 if (scsi_device_get(sdev) == 0) {
3850 /* The following ensures the attached sdev is
3851 * offline on return from ata_scsi_offline_dev()
3852 * regardless it wins or loses the race
3853 * against this function.
3854 */
3855 scsi_device_set_state(sdev, SDEV_OFFLINE);
3856 } else {
3857 WARN_ON(1);
3858 sdev = NULL;
3859 }
3860 }
3861
3862 spin_unlock_irqrestore(ap->lock, flags);
3863 mutex_unlock(&ap->scsi_host->scan_mutex);
3864
3865 if (sdev) {
3866 ata_dev_info(dev, "detaching (SCSI %s)\n",
3867 dev_name(&sdev->sdev_gendev));
3868
3869 scsi_remove_device(sdev);
3870 scsi_device_put(sdev);
3871 }
3872}
3873
3874static void ata_scsi_handle_link_detach(struct ata_link *link)
3875{
3876 struct ata_port *ap = link->ap;
3877 struct ata_device *dev;
3878
3879 ata_for_each_dev(dev, link, ALL) {
3880 unsigned long flags;
3881
3882 if (!(dev->flags & ATA_DFLAG_DETACHED))
3883 continue;
3884
3885 spin_lock_irqsave(ap->lock, flags);
3886 dev->flags &= ~ATA_DFLAG_DETACHED;
3887 spin_unlock_irqrestore(ap->lock, flags);
3888
3889 if (zpodd_dev_enabled(dev))
3890 zpodd_exit(dev);
3891
3892 ata_scsi_remove_dev(dev);
3893 }
3894}
3895
3896/**
3897 * ata_scsi_media_change_notify - send media change event
3898 * @dev: Pointer to the disk device with media change event
3899 *
3900 * Tell the block layer to send a media change notification
3901 * event.
3902 *
3903 * LOCKING:
3904 * spin_lock_irqsave(host lock)
3905 */
3906void ata_scsi_media_change_notify(struct ata_device *dev)
3907{
3908 if (dev->sdev)
3909 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
3910 GFP_ATOMIC);
3911}
3912
3913/**
3914 * ata_scsi_hotplug - SCSI part of hotplug
3915 * @work: Pointer to ATA port to perform SCSI hotplug on
3916 *
3917 * Perform SCSI part of hotplug. It's executed from a separate
3918 * workqueue after EH completes. This is necessary because SCSI
3919 * hot plugging requires working EH and hot unplugging is
3920 * synchronized with hot plugging with a mutex.
3921 *
3922 * LOCKING:
3923 * Kernel thread context (may sleep).
3924 */
3925void ata_scsi_hotplug(struct work_struct *work)
3926{
3927 struct ata_port *ap =
3928 container_of(work, struct ata_port, hotplug_task.work);
3929 int i;
3930
3931 if (ap->pflags & ATA_PFLAG_UNLOADING) {
3932 DPRINTK("ENTER/EXIT - unloading\n");
3933 return;
3934 }
3935
3936 /*
3937 * XXX - UGLY HACK
3938 *
3939 * The block layer suspend/resume path is fundamentally broken due
3940 * to freezable kthreads and workqueue and may deadlock if a block
3941 * device gets removed while resume is in progress. I don't know
3942 * what the solution is short of removing freezable kthreads and
3943 * workqueues altogether.
3944 *
3945 * The following is an ugly hack to avoid kicking off device
3946 * removal while freezer is active. This is a joke but does avoid
3947 * this particular deadlock scenario.
3948 *
3949 * https://bugzilla.kernel.org/show_bug.cgi?id=62801
3950 * http://marc.info/?l=linux-kernel&m=138695698516487
3951 */
3952#ifdef CONFIG_FREEZER
3953 while (pm_freezing)
3954 msleep(10);
3955#endif
3956
3957 DPRINTK("ENTER\n");
3958 mutex_lock(&ap->scsi_scan_mutex);
3959
3960 /* Unplug detached devices. We cannot use link iterator here
3961 * because PMP links have to be scanned even if PMP is
3962 * currently not attached. Iterate manually.
3963 */
3964 ata_scsi_handle_link_detach(&ap->link);
3965 if (ap->pmp_link)
3966 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
3967 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
3968
3969 /* scan for new ones */
3970 ata_scsi_scan_host(ap, 0);
3971
3972 mutex_unlock(&ap->scsi_scan_mutex);
3973 DPRINTK("EXIT\n");
3974}
3975
3976/**
3977 * ata_scsi_user_scan - indication for user-initiated bus scan
3978 * @shost: SCSI host to scan
3979 * @channel: Channel to scan
3980 * @id: ID to scan
3981 * @lun: LUN to scan
3982 *
3983 * This function is called when user explicitly requests bus
3984 * scan. Set probe pending flag and invoke EH.
3985 *
3986 * LOCKING:
3987 * SCSI layer (we don't care)
3988 *
3989 * RETURNS:
3990 * Zero.
3991 */
3992int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
3993 unsigned int id, u64 lun)
3994{
3995 struct ata_port *ap = ata_shost_to_port(shost);
3996 unsigned long flags;
3997 int devno, rc = 0;
3998
3999 if (!ap->ops->error_handler)
4000 return -EOPNOTSUPP;
4001
4002 if (lun != SCAN_WILD_CARD && lun)
4003 return -EINVAL;
4004
4005 if (!sata_pmp_attached(ap)) {
4006 if (channel != SCAN_WILD_CARD && channel)
4007 return -EINVAL;
4008 devno = id;
4009 } else {
4010 if (id != SCAN_WILD_CARD && id)
4011 return -EINVAL;
4012 devno = channel;
4013 }
4014
4015 spin_lock_irqsave(ap->lock, flags);
4016
4017 if (devno == SCAN_WILD_CARD) {
4018 struct ata_link *link;
4019
4020 ata_for_each_link(link, ap, EDGE) {
4021 struct ata_eh_info *ehi = &link->eh_info;
4022 ehi->probe_mask |= ATA_ALL_DEVICES;
4023 ehi->action |= ATA_EH_RESET;
4024 }
4025 } else {
4026 struct ata_device *dev = ata_find_dev(ap, devno);
4027
4028 if (dev) {
4029 struct ata_eh_info *ehi = &dev->link->eh_info;
4030 ehi->probe_mask |= 1 << dev->devno;
4031 ehi->action |= ATA_EH_RESET;
4032 } else
4033 rc = -EINVAL;
4034 }
4035
4036 if (rc == 0) {
4037 ata_port_schedule_eh(ap);
4038 spin_unlock_irqrestore(ap->lock, flags);
4039 ata_port_wait_eh(ap);
4040 } else
4041 spin_unlock_irqrestore(ap->lock, flags);
4042
4043 return rc;
4044}
4045
4046/**
4047 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
4048 * @work: Pointer to ATA port to perform scsi_rescan_device()
4049 *
4050 * After ATA pass thru (SAT) commands are executed successfully,
4051 * libata need to propagate the changes to SCSI layer.
4052 *
4053 * LOCKING:
4054 * Kernel thread context (may sleep).
4055 */
4056void ata_scsi_dev_rescan(struct work_struct *work)
4057{
4058 struct ata_port *ap =
4059 container_of(work, struct ata_port, scsi_rescan_task);
4060 struct ata_link *link;
4061 struct ata_device *dev;
4062 unsigned long flags;
4063
4064 mutex_lock(&ap->scsi_scan_mutex);
4065 spin_lock_irqsave(ap->lock, flags);
4066
4067 ata_for_each_link(link, ap, EDGE) {
4068 ata_for_each_dev(dev, link, ENABLED) {
4069 struct scsi_device *sdev = dev->sdev;
4070
4071 if (!sdev)
4072 continue;
4073 if (scsi_device_get(sdev))
4074 continue;
4075
4076 spin_unlock_irqrestore(ap->lock, flags);
4077 scsi_rescan_device(&(sdev->sdev_gendev));
4078 scsi_device_put(sdev);
4079 spin_lock_irqsave(ap->lock, flags);
4080 }
4081 }
4082
4083 spin_unlock_irqrestore(ap->lock, flags);
4084 mutex_unlock(&ap->scsi_scan_mutex);
4085}
4086
4087/**
4088 * ata_sas_port_alloc - Allocate port for a SAS attached SATA device
4089 * @host: ATA host container for all SAS ports
4090 * @port_info: Information from low-level host driver
4091 * @shost: SCSI host that the scsi device is attached to
4092 *
4093 * LOCKING:
4094 * PCI/etc. bus probe sem.
4095 *
4096 * RETURNS:
4097 * ata_port pointer on success / NULL on failure.
4098 */
4099
4100struct ata_port *ata_sas_port_alloc(struct ata_host *host,
4101 struct ata_port_info *port_info,
4102 struct Scsi_Host *shost)
4103{
4104 struct ata_port *ap;
4105
4106 ap = ata_port_alloc(host);
4107 if (!ap)
4108 return NULL;
4109
4110 ap->port_no = 0;
4111 ap->lock = &host->lock;
4112 ap->pio_mask = port_info->pio_mask;
4113 ap->mwdma_mask = port_info->mwdma_mask;
4114 ap->udma_mask = port_info->udma_mask;
4115 ap->flags |= port_info->flags;
4116 ap->ops = port_info->port_ops;
4117 ap->cbl = ATA_CBL_SATA;
4118
4119 return ap;
4120}
4121EXPORT_SYMBOL_GPL(ata_sas_port_alloc);
4122
4123/**
4124 * ata_sas_port_start - Set port up for dma.
4125 * @ap: Port to initialize
4126 *
4127 * Called just after data structures for each port are
4128 * initialized.
4129 *
4130 * May be used as the port_start() entry in ata_port_operations.
4131 *
4132 * LOCKING:
4133 * Inherited from caller.
4134 */
4135int ata_sas_port_start(struct ata_port *ap)
4136{
4137 /*
4138 * the port is marked as frozen at allocation time, but if we don't
4139 * have new eh, we won't thaw it
4140 */
4141 if (!ap->ops->error_handler)
4142 ap->pflags &= ~ATA_PFLAG_FROZEN;
4143 return 0;
4144}
4145EXPORT_SYMBOL_GPL(ata_sas_port_start);
4146
4147/**
4148 * ata_port_stop - Undo ata_sas_port_start()
4149 * @ap: Port to shut down
4150 *
4151 * May be used as the port_stop() entry in ata_port_operations.
4152 *
4153 * LOCKING:
4154 * Inherited from caller.
4155 */
4156
4157void ata_sas_port_stop(struct ata_port *ap)
4158{
4159}
4160EXPORT_SYMBOL_GPL(ata_sas_port_stop);
4161
4162/**
4163 * ata_sas_async_probe - simply schedule probing and return
4164 * @ap: Port to probe
4165 *
4166 * For batch scheduling of probe for sas attached ata devices, assumes
4167 * the port has already been through ata_sas_port_init()
4168 */
4169void ata_sas_async_probe(struct ata_port *ap)
4170{
4171 __ata_port_probe(ap);
4172}
4173EXPORT_SYMBOL_GPL(ata_sas_async_probe);
4174
4175int ata_sas_sync_probe(struct ata_port *ap)
4176{
4177 return ata_port_probe(ap);
4178}
4179EXPORT_SYMBOL_GPL(ata_sas_sync_probe);
4180
4181
4182/**
4183 * ata_sas_port_init - Initialize a SATA device
4184 * @ap: SATA port to initialize
4185 *
4186 * LOCKING:
4187 * PCI/etc. bus probe sem.
4188 *
4189 * RETURNS:
4190 * Zero on success, non-zero on error.
4191 */
4192
4193int ata_sas_port_init(struct ata_port *ap)
4194{
4195 int rc = ap->ops->port_start(ap);
4196
4197 if (rc)
4198 return rc;
4199 ap->print_id = atomic_inc_return(&ata_print_id);
4200 return 0;
4201}
4202EXPORT_SYMBOL_GPL(ata_sas_port_init);
4203
4204/**
4205 * ata_sas_port_destroy - Destroy a SATA port allocated by ata_sas_port_alloc
4206 * @ap: SATA port to destroy
4207 *
4208 */
4209
4210void ata_sas_port_destroy(struct ata_port *ap)
4211{
4212 if (ap->ops->port_stop)
4213 ap->ops->port_stop(ap);
4214 kfree(ap);
4215}
4216EXPORT_SYMBOL_GPL(ata_sas_port_destroy);
4217
4218/**
4219 * ata_sas_slave_configure - Default slave_config routine for libata devices
4220 * @sdev: SCSI device to configure
4221 * @ap: ATA port to which SCSI device is attached
4222 *
4223 * RETURNS:
4224 * Zero.
4225 */
4226
4227int ata_sas_slave_configure(struct scsi_device *sdev, struct ata_port *ap)
4228{
4229 ata_scsi_sdev_config(sdev);
4230 ata_scsi_dev_config(sdev, ap->link.device);
4231 return 0;
4232}
4233EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
4234
4235/**
4236 * ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
4237 * @cmd: SCSI command to be sent
4238 * @ap: ATA port to which the command is being sent
4239 *
4240 * RETURNS:
4241 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4242 * 0 otherwise.
4243 */
4244
4245int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
4246{
4247 int rc = 0;
4248
4249 ata_scsi_dump_cdb(ap, cmd);
4250
4251 if (likely(ata_dev_enabled(ap->link.device)))
4252 rc = __ata_scsi_queuecmd(cmd, ap->link.device);
4253 else {
4254 cmd->result = (DID_BAD_TARGET << 16);
4255 cmd->scsi_done(cmd);
4256 }
4257 return rc;
4258}
4259EXPORT_SYMBOL_GPL(ata_sas_queuecmd);
4260
4261int ata_sas_allocate_tag(struct ata_port *ap)
4262{
4263 unsigned int max_queue = ap->host->n_tags;
4264 unsigned int i, tag;
4265
4266 for (i = 0, tag = ap->sas_last_tag + 1; i < max_queue; i++, tag++) {
4267 tag = tag < max_queue ? tag : 0;
4268
4269 /* the last tag is reserved for internal command. */
4270 if (tag == ATA_TAG_INTERNAL)
4271 continue;
4272
4273 if (!test_and_set_bit(tag, &ap->sas_tag_allocated)) {
4274 ap->sas_last_tag = tag;
4275 return tag;
4276 }
4277 }
4278 return -1;
4279}
4280
4281void ata_sas_free_tag(unsigned int tag, struct ata_port *ap)
4282{
4283 clear_bit(tag, &ap->sas_tag_allocated);
4284}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * libata-scsi.c - helper library for ATA
4 *
5 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
6 * Copyright 2003-2004 Jeff Garzik
7 *
8 * libata documentation is available via 'make {ps|pdf}docs',
9 * as Documentation/driver-api/libata.rst
10 *
11 * Hardware documentation available from
12 * - http://www.t10.org/
13 * - http://www.t13.org/
14 */
15
16#include <linux/compat.h>
17#include <linux/slab.h>
18#include <linux/kernel.h>
19#include <linux/blkdev.h>
20#include <linux/spinlock.h>
21#include <linux/export.h>
22#include <scsi/scsi.h>
23#include <scsi/scsi_host.h>
24#include <scsi/scsi_cmnd.h>
25#include <scsi/scsi_eh.h>
26#include <scsi/scsi_device.h>
27#include <scsi/scsi_tcq.h>
28#include <scsi/scsi_transport.h>
29#include <linux/libata.h>
30#include <linux/hdreg.h>
31#include <linux/uaccess.h>
32#include <linux/suspend.h>
33#include <linux/unaligned.h>
34#include <linux/ioprio.h>
35#include <linux/of.h>
36
37#include "libata.h"
38#include "libata-transport.h"
39
40#define ATA_SCSI_RBUF_SIZE 2048
41
42static DEFINE_SPINLOCK(ata_scsi_rbuf_lock);
43static u8 ata_scsi_rbuf[ATA_SCSI_RBUF_SIZE];
44
45typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc);
46
47static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
48 const struct scsi_device *scsidev);
49
50#define RW_RECOVERY_MPAGE 0x1
51#define RW_RECOVERY_MPAGE_LEN 12
52#define CACHE_MPAGE 0x8
53#define CACHE_MPAGE_LEN 20
54#define CONTROL_MPAGE 0xa
55#define CONTROL_MPAGE_LEN 12
56#define ALL_MPAGES 0x3f
57#define ALL_SUB_MPAGES 0xff
58#define CDL_T2A_SUB_MPAGE 0x07
59#define CDL_T2B_SUB_MPAGE 0x08
60#define CDL_T2_SUB_MPAGE_LEN 232
61#define ATA_FEATURE_SUB_MPAGE 0xf2
62#define ATA_FEATURE_SUB_MPAGE_LEN 16
63
64static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
65 RW_RECOVERY_MPAGE,
66 RW_RECOVERY_MPAGE_LEN - 2,
67 (1 << 7), /* AWRE */
68 0, /* read retry count */
69 0, 0, 0, 0,
70 0, /* write retry count */
71 0, 0, 0
72};
73
74static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
75 CACHE_MPAGE,
76 CACHE_MPAGE_LEN - 2,
77 0, /* contains WCE, needs to be 0 for logic */
78 0, 0, 0, 0, 0, 0, 0, 0, 0,
79 0, /* contains DRA, needs to be 0 for logic */
80 0, 0, 0, 0, 0, 0, 0
81};
82
83static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
84 CONTROL_MPAGE,
85 CONTROL_MPAGE_LEN - 2,
86 2, /* DSENSE=0, GLTSD=1 */
87 0, /* [QAM+QERR may be 1, see 05-359r1] */
88 0, 0, 0, 0, 0xff, 0xff,
89 0, 30 /* extended self test time, see 05-359r1 */
90};
91
92static ssize_t ata_scsi_park_show(struct device *device,
93 struct device_attribute *attr, char *buf)
94{
95 struct scsi_device *sdev = to_scsi_device(device);
96 struct ata_port *ap;
97 struct ata_link *link;
98 struct ata_device *dev;
99 unsigned long now;
100 unsigned int msecs;
101 int rc = 0;
102
103 ap = ata_shost_to_port(sdev->host);
104
105 spin_lock_irq(ap->lock);
106 dev = ata_scsi_find_dev(ap, sdev);
107 if (!dev) {
108 rc = -ENODEV;
109 goto unlock;
110 }
111 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
112 rc = -EOPNOTSUPP;
113 goto unlock;
114 }
115
116 link = dev->link;
117 now = jiffies;
118 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
119 link->eh_context.unloaded_mask & (1 << dev->devno) &&
120 time_after(dev->unpark_deadline, now))
121 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
122 else
123 msecs = 0;
124
125unlock:
126 spin_unlock_irq(ap->lock);
127
128 return rc ? rc : sysfs_emit(buf, "%u\n", msecs);
129}
130
131static ssize_t ata_scsi_park_store(struct device *device,
132 struct device_attribute *attr,
133 const char *buf, size_t len)
134{
135 struct scsi_device *sdev = to_scsi_device(device);
136 struct ata_port *ap;
137 struct ata_device *dev;
138 int input;
139 unsigned long flags;
140 int rc;
141
142 rc = kstrtoint(buf, 10, &input);
143 if (rc)
144 return rc;
145 if (input < -2)
146 return -EINVAL;
147 if (input > ATA_TMOUT_MAX_PARK) {
148 rc = -EOVERFLOW;
149 input = ATA_TMOUT_MAX_PARK;
150 }
151
152 ap = ata_shost_to_port(sdev->host);
153
154 spin_lock_irqsave(ap->lock, flags);
155 dev = ata_scsi_find_dev(ap, sdev);
156 if (unlikely(!dev)) {
157 rc = -ENODEV;
158 goto unlock;
159 }
160 if (dev->class != ATA_DEV_ATA &&
161 dev->class != ATA_DEV_ZAC) {
162 rc = -EOPNOTSUPP;
163 goto unlock;
164 }
165
166 if (input >= 0) {
167 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
168 rc = -EOPNOTSUPP;
169 goto unlock;
170 }
171
172 dev->unpark_deadline = ata_deadline(jiffies, input);
173 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
174 ata_port_schedule_eh(ap);
175 complete(&ap->park_req_pending);
176 } else {
177 switch (input) {
178 case -1:
179 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
180 break;
181 case -2:
182 dev->flags |= ATA_DFLAG_NO_UNLOAD;
183 break;
184 }
185 }
186unlock:
187 spin_unlock_irqrestore(ap->lock, flags);
188
189 return rc ? rc : len;
190}
191DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
192 ata_scsi_park_show, ata_scsi_park_store);
193EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
194
195bool ata_scsi_sense_is_valid(u8 sk, u8 asc, u8 ascq)
196{
197 /*
198 * If sk == NO_SENSE, and asc + ascq == NO ADDITIONAL SENSE INFORMATION,
199 * then there is no sense data to add.
200 */
201 if (sk == 0 && asc == 0 && ascq == 0)
202 return false;
203
204 /* If sk > COMPLETED, sense data is bogus. */
205 if (sk > COMPLETED)
206 return false;
207
208 return true;
209}
210
211void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
212 u8 sk, u8 asc, u8 ascq)
213{
214 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
215
216 scsi_build_sense(cmd, d_sense, sk, asc, ascq);
217}
218
219void ata_scsi_set_sense_information(struct ata_device *dev,
220 struct scsi_cmnd *cmd,
221 const struct ata_taskfile *tf)
222{
223 u64 information;
224
225 information = ata_tf_read_block(tf, dev);
226 if (information == U64_MAX)
227 return;
228
229 scsi_set_sense_information(cmd->sense_buffer,
230 SCSI_SENSE_BUFFERSIZE, information);
231}
232
233/**
234 * ata_scsi_set_passthru_sense_fields - Set ATA fields in sense buffer
235 * @qc: ATA PASS-THROUGH command.
236 *
237 * Populates "ATA Status Return sense data descriptor" / "Fixed format
238 * sense data" with ATA taskfile fields.
239 *
240 * LOCKING:
241 * None.
242 */
243static void ata_scsi_set_passthru_sense_fields(struct ata_queued_cmd *qc)
244{
245 struct ata_device *dev = qc->dev;
246 struct scsi_cmnd *cmd = qc->scsicmd;
247 struct ata_taskfile *tf = &qc->result_tf;
248 unsigned char *sb = cmd->sense_buffer;
249
250 if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
251 ata_dev_dbg(dev,
252 "missing result TF: can't set ATA PT sense fields\n");
253 return;
254 }
255
256 if ((sb[0] & 0x7f) >= 0x72) {
257 unsigned char *desc;
258 u8 len;
259
260 /* descriptor format */
261 len = sb[7];
262 desc = (char *)scsi_sense_desc_find(sb, len + 8, 9);
263 if (!desc) {
264 if (SCSI_SENSE_BUFFERSIZE < len + 14)
265 return;
266 sb[7] = len + 14;
267 desc = sb + 8 + len;
268 }
269 desc[0] = 9;
270 desc[1] = 12;
271 /*
272 * Copy registers into sense buffer.
273 */
274 desc[2] = 0x00;
275 desc[3] = tf->error;
276 desc[5] = tf->nsect;
277 desc[7] = tf->lbal;
278 desc[9] = tf->lbam;
279 desc[11] = tf->lbah;
280 desc[12] = tf->device;
281 desc[13] = tf->status;
282
283 /*
284 * Fill in Extend bit, and the high order bytes
285 * if applicable.
286 */
287 if (tf->flags & ATA_TFLAG_LBA48) {
288 desc[2] |= 0x01;
289 desc[4] = tf->hob_nsect;
290 desc[6] = tf->hob_lbal;
291 desc[8] = tf->hob_lbam;
292 desc[10] = tf->hob_lbah;
293 }
294 } else {
295 /* Fixed sense format */
296 sb[0] |= 0x80;
297 sb[3] = tf->error;
298 sb[4] = tf->status;
299 sb[5] = tf->device;
300 sb[6] = tf->nsect;
301 if (tf->flags & ATA_TFLAG_LBA48) {
302 sb[8] |= 0x80;
303 if (tf->hob_nsect)
304 sb[8] |= 0x40;
305 if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah)
306 sb[8] |= 0x20;
307 }
308 sb[9] = tf->lbal;
309 sb[10] = tf->lbam;
310 sb[11] = tf->lbah;
311 }
312}
313
314static void ata_scsi_set_invalid_field(struct ata_device *dev,
315 struct scsi_cmnd *cmd, u16 field, u8 bit)
316{
317 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0);
318 /* "Invalid field in CDB" */
319 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
320 field, bit, 1);
321}
322
323static void ata_scsi_set_invalid_parameter(struct ata_device *dev,
324 struct scsi_cmnd *cmd, u16 field)
325{
326 /* "Invalid field in parameter list" */
327 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0);
328 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
329 field, 0xff, 0);
330}
331
332static struct attribute *ata_common_sdev_attrs[] = {
333 &dev_attr_unload_heads.attr,
334 NULL
335};
336
337static const struct attribute_group ata_common_sdev_attr_group = {
338 .attrs = ata_common_sdev_attrs
339};
340
341const struct attribute_group *ata_common_sdev_groups[] = {
342 &ata_common_sdev_attr_group,
343 NULL
344};
345EXPORT_SYMBOL_GPL(ata_common_sdev_groups);
346
347/**
348 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
349 * @sdev: SCSI device for which BIOS geometry is to be determined
350 * @bdev: block device associated with @sdev
351 * @capacity: capacity of SCSI device
352 * @geom: location to which geometry will be output
353 *
354 * Generic bios head/sector/cylinder calculator
355 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
356 * mapping. Some situations may arise where the disk is not
357 * bootable if this is not used.
358 *
359 * LOCKING:
360 * Defined by the SCSI layer. We don't really care.
361 *
362 * RETURNS:
363 * Zero.
364 */
365int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
366 sector_t capacity, int geom[])
367{
368 geom[0] = 255;
369 geom[1] = 63;
370 sector_div(capacity, 255*63);
371 geom[2] = capacity;
372
373 return 0;
374}
375EXPORT_SYMBOL_GPL(ata_std_bios_param);
376
377/**
378 * ata_scsi_unlock_native_capacity - unlock native capacity
379 * @sdev: SCSI device to adjust device capacity for
380 *
381 * This function is called if a partition on @sdev extends beyond
382 * the end of the device. It requests EH to unlock HPA.
383 *
384 * LOCKING:
385 * Defined by the SCSI layer. Might sleep.
386 */
387void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
388{
389 struct ata_port *ap = ata_shost_to_port(sdev->host);
390 struct ata_device *dev;
391 unsigned long flags;
392
393 spin_lock_irqsave(ap->lock, flags);
394
395 dev = ata_scsi_find_dev(ap, sdev);
396 if (dev && dev->n_sectors < dev->n_native_sectors) {
397 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
398 dev->link->eh_info.action |= ATA_EH_RESET;
399 ata_port_schedule_eh(ap);
400 }
401
402 spin_unlock_irqrestore(ap->lock, flags);
403 ata_port_wait_eh(ap);
404}
405EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
406
407/**
408 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
409 * @ap: target port
410 * @sdev: SCSI device to get identify data for
411 * @arg: User buffer area for identify data
412 *
413 * LOCKING:
414 * Defined by the SCSI layer. We don't really care.
415 *
416 * RETURNS:
417 * Zero on success, negative errno on error.
418 */
419static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
420 void __user *arg)
421{
422 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
423 u16 __user *dst = arg;
424 char buf[40];
425
426 if (!dev)
427 return -ENOMSG;
428
429 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
430 return -EFAULT;
431
432 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
433 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
434 return -EFAULT;
435
436 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
437 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
438 return -EFAULT;
439
440 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
441 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
442 return -EFAULT;
443
444 return 0;
445}
446
447/**
448 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
449 * @scsidev: Device to which we are issuing command
450 * @arg: User provided data for issuing command
451 *
452 * LOCKING:
453 * Defined by the SCSI layer. We don't really care.
454 *
455 * RETURNS:
456 * Zero on success, negative errno on error.
457 */
458int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
459{
460 int rc = 0;
461 u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
462 u8 scsi_cmd[MAX_COMMAND_SIZE];
463 u8 args[4], *argbuf = NULL;
464 int argsize = 0;
465 struct scsi_sense_hdr sshdr;
466 const struct scsi_exec_args exec_args = {
467 .sshdr = &sshdr,
468 .sense = sensebuf,
469 .sense_len = sizeof(sensebuf),
470 };
471 int cmd_result;
472
473 if (arg == NULL)
474 return -EINVAL;
475
476 if (copy_from_user(args, arg, sizeof(args)))
477 return -EFAULT;
478
479 memset(sensebuf, 0, sizeof(sensebuf));
480 memset(scsi_cmd, 0, sizeof(scsi_cmd));
481
482 if (args[3]) {
483 argsize = ATA_SECT_SIZE * args[3];
484 argbuf = kmalloc(argsize, GFP_KERNEL);
485 if (argbuf == NULL) {
486 rc = -ENOMEM;
487 goto error;
488 }
489
490 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
491 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
492 block count in sector count field */
493 } else {
494 scsi_cmd[1] = (3 << 1); /* Non-data */
495 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
496 }
497
498 scsi_cmd[0] = ATA_16;
499
500 scsi_cmd[4] = args[2];
501 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
502 scsi_cmd[6] = args[3];
503 scsi_cmd[8] = args[1];
504 scsi_cmd[10] = ATA_SMART_LBAM_PASS;
505 scsi_cmd[12] = ATA_SMART_LBAH_PASS;
506 } else {
507 scsi_cmd[6] = args[1];
508 }
509 scsi_cmd[14] = args[0];
510
511 /* Good values for timeout and retries? Values below
512 from scsi_ioctl_send_command() for default case... */
513 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, argbuf,
514 argsize, 10 * HZ, 5, &exec_args);
515 if (cmd_result < 0) {
516 rc = cmd_result;
517 goto error;
518 }
519 if (scsi_sense_valid(&sshdr)) {/* sense data available */
520 u8 *desc = sensebuf + 8;
521
522 /* If we set cc then ATA pass-through will cause a
523 * check condition even if no error. Filter that. */
524 if (scsi_status_is_check_condition(cmd_result)) {
525 if (sshdr.sense_key == RECOVERED_ERROR &&
526 sshdr.asc == 0 && sshdr.ascq == 0x1d)
527 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
528 }
529
530 /* Send userspace a few ATA registers (same as drivers/ide) */
531 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
532 desc[0] == 0x09) { /* code is "ATA Descriptor" */
533 args[0] = desc[13]; /* status */
534 args[1] = desc[3]; /* error */
535 args[2] = desc[5]; /* sector count (0:7) */
536 if (copy_to_user(arg, args, sizeof(args)))
537 rc = -EFAULT;
538 }
539 }
540
541
542 if (cmd_result) {
543 rc = -EIO;
544 goto error;
545 }
546
547 if ((argbuf)
548 && copy_to_user(arg + sizeof(args), argbuf, argsize))
549 rc = -EFAULT;
550error:
551 kfree(argbuf);
552 return rc;
553}
554
555/**
556 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
557 * @scsidev: Device to which we are issuing command
558 * @arg: User provided data for issuing command
559 *
560 * LOCKING:
561 * Defined by the SCSI layer. We don't really care.
562 *
563 * RETURNS:
564 * Zero on success, negative errno on error.
565 */
566int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
567{
568 int rc = 0;
569 u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
570 u8 scsi_cmd[MAX_COMMAND_SIZE];
571 u8 args[7];
572 struct scsi_sense_hdr sshdr;
573 int cmd_result;
574 const struct scsi_exec_args exec_args = {
575 .sshdr = &sshdr,
576 .sense = sensebuf,
577 .sense_len = sizeof(sensebuf),
578 };
579
580 if (arg == NULL)
581 return -EINVAL;
582
583 if (copy_from_user(args, arg, sizeof(args)))
584 return -EFAULT;
585
586 memset(sensebuf, 0, sizeof(sensebuf));
587 memset(scsi_cmd, 0, sizeof(scsi_cmd));
588 scsi_cmd[0] = ATA_16;
589 scsi_cmd[1] = (3 << 1); /* Non-data */
590 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
591 scsi_cmd[4] = args[1];
592 scsi_cmd[6] = args[2];
593 scsi_cmd[8] = args[3];
594 scsi_cmd[10] = args[4];
595 scsi_cmd[12] = args[5];
596 scsi_cmd[13] = args[6] & 0x4f;
597 scsi_cmd[14] = args[0];
598
599 /* Good values for timeout and retries? Values below
600 from scsi_ioctl_send_command() for default case... */
601 cmd_result = scsi_execute_cmd(scsidev, scsi_cmd, REQ_OP_DRV_IN, NULL,
602 0, 10 * HZ, 5, &exec_args);
603 if (cmd_result < 0) {
604 rc = cmd_result;
605 goto error;
606 }
607 if (scsi_sense_valid(&sshdr)) {/* sense data available */
608 u8 *desc = sensebuf + 8;
609
610 /* If we set cc then ATA pass-through will cause a
611 * check condition even if no error. Filter that. */
612 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
613 if (sshdr.sense_key == RECOVERED_ERROR &&
614 sshdr.asc == 0 && sshdr.ascq == 0x1d)
615 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
616 }
617
618 /* Send userspace ATA registers */
619 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
620 desc[0] == 0x09) {/* code is "ATA Descriptor" */
621 args[0] = desc[13]; /* status */
622 args[1] = desc[3]; /* error */
623 args[2] = desc[5]; /* sector count (0:7) */
624 args[3] = desc[7]; /* lbal */
625 args[4] = desc[9]; /* lbam */
626 args[5] = desc[11]; /* lbah */
627 args[6] = desc[12]; /* select */
628 if (copy_to_user(arg, args, sizeof(args)))
629 rc = -EFAULT;
630 }
631 }
632
633 if (cmd_result) {
634 rc = -EIO;
635 goto error;
636 }
637
638 error:
639 return rc;
640}
641
642static bool ata_ioc32(struct ata_port *ap)
643{
644 if (ap->flags & ATA_FLAG_PIO_DMA)
645 return true;
646 if (ap->pflags & ATA_PFLAG_PIO32)
647 return true;
648 return false;
649}
650
651/*
652 * This handles both native and compat commands, so anything added
653 * here must have a compatible argument, or check in_compat_syscall()
654 */
655int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
656 unsigned int cmd, void __user *arg)
657{
658 unsigned long val;
659 int rc = -EINVAL;
660 unsigned long flags;
661
662 switch (cmd) {
663 case HDIO_GET_32BIT:
664 spin_lock_irqsave(ap->lock, flags);
665 val = ata_ioc32(ap);
666 spin_unlock_irqrestore(ap->lock, flags);
667#ifdef CONFIG_COMPAT
668 if (in_compat_syscall())
669 return put_user(val, (compat_ulong_t __user *)arg);
670#endif
671 return put_user(val, (unsigned long __user *)arg);
672
673 case HDIO_SET_32BIT:
674 val = (unsigned long) arg;
675 rc = 0;
676 spin_lock_irqsave(ap->lock, flags);
677 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
678 if (val)
679 ap->pflags |= ATA_PFLAG_PIO32;
680 else
681 ap->pflags &= ~ATA_PFLAG_PIO32;
682 } else {
683 if (val != ata_ioc32(ap))
684 rc = -EINVAL;
685 }
686 spin_unlock_irqrestore(ap->lock, flags);
687 return rc;
688
689 case HDIO_GET_IDENTITY:
690 return ata_get_identity(ap, scsidev, arg);
691
692 case HDIO_DRIVE_CMD:
693 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
694 return -EACCES;
695 return ata_cmd_ioctl(scsidev, arg);
696
697 case HDIO_DRIVE_TASK:
698 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
699 return -EACCES;
700 return ata_task_ioctl(scsidev, arg);
701
702 default:
703 rc = -ENOTTY;
704 break;
705 }
706
707 return rc;
708}
709EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
710
711int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd,
712 void __user *arg)
713{
714 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
715 scsidev, cmd, arg);
716}
717EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
718
719/**
720 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
721 * @dev: ATA device to which the new command is attached
722 * @cmd: SCSI command that originated this ATA command
723 *
724 * Obtain a reference to an unused ata_queued_cmd structure,
725 * which is the basic libata structure representing a single
726 * ATA command sent to the hardware.
727 *
728 * If a command was available, fill in the SCSI-specific
729 * portions of the structure with information on the
730 * current command.
731 *
732 * LOCKING:
733 * spin_lock_irqsave(host lock)
734 *
735 * RETURNS:
736 * Command allocated, or %NULL if none available.
737 */
738static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
739 struct scsi_cmnd *cmd)
740{
741 struct ata_port *ap = dev->link->ap;
742 struct ata_queued_cmd *qc;
743 int tag;
744
745 if (unlikely(ata_port_is_frozen(ap)))
746 goto fail;
747
748 if (ap->flags & ATA_FLAG_SAS_HOST) {
749 /*
750 * SAS hosts may queue > ATA_MAX_QUEUE commands so use
751 * unique per-device budget token as a tag.
752 */
753 if (WARN_ON_ONCE(cmd->budget_token >= ATA_MAX_QUEUE))
754 goto fail;
755 tag = cmd->budget_token;
756 } else {
757 tag = scsi_cmd_to_rq(cmd)->tag;
758 }
759
760 qc = __ata_qc_from_tag(ap, tag);
761 qc->tag = qc->hw_tag = tag;
762 qc->ap = ap;
763 qc->dev = dev;
764
765 ata_qc_reinit(qc);
766
767 qc->scsicmd = cmd;
768 qc->scsidone = scsi_done;
769
770 qc->sg = scsi_sglist(cmd);
771 qc->n_elem = scsi_sg_count(cmd);
772
773 if (scsi_cmd_to_rq(cmd)->rq_flags & RQF_QUIET)
774 qc->flags |= ATA_QCFLAG_QUIET;
775
776 return qc;
777
778fail:
779 set_host_byte(cmd, DID_OK);
780 set_status_byte(cmd, SAM_STAT_TASK_SET_FULL);
781 scsi_done(cmd);
782 return NULL;
783}
784
785static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
786{
787 struct scsi_cmnd *scmd = qc->scsicmd;
788
789 qc->extrabytes = scmd->extra_len;
790 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
791}
792
793/**
794 * ata_to_sense_error - convert ATA error to SCSI error
795 * @drv_stat: value contained in ATA status register
796 * @drv_err: value contained in ATA error register
797 * @sk: the sense key we'll fill out
798 * @asc: the additional sense code we'll fill out
799 * @ascq: the additional sense code qualifier we'll fill out
800 *
801 * Converts an ATA error into a SCSI error. Fill out pointers to
802 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
803 * format sense blocks.
804 *
805 * LOCKING:
806 * spin_lock_irqsave(host lock)
807 */
808static void ata_to_sense_error(u8 drv_stat, u8 drv_err, u8 *sk, u8 *asc,
809 u8 *ascq)
810{
811 int i;
812
813 /* Based on the 3ware driver translation table */
814 static const unsigned char sense_table[][4] = {
815 /* BBD|ECC|ID|MAR */
816 {0xd1, ABORTED_COMMAND, 0x00, 0x00},
817 // Device busy Aborted command
818 /* BBD|ECC|ID */
819 {0xd0, ABORTED_COMMAND, 0x00, 0x00},
820 // Device busy Aborted command
821 /* ECC|MC|MARK */
822 {0x61, HARDWARE_ERROR, 0x00, 0x00},
823 // Device fault Hardware error
824 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
825 {0x84, ABORTED_COMMAND, 0x47, 0x00},
826 // Data CRC error SCSI parity error
827 /* MC|ID|ABRT|TRK0|MARK */
828 {0x37, NOT_READY, 0x04, 0x00},
829 // Unit offline Not ready
830 /* MCR|MARK */
831 {0x09, NOT_READY, 0x04, 0x00},
832 // Unrecovered disk error Not ready
833 /* Bad address mark */
834 {0x01, MEDIUM_ERROR, 0x13, 0x00},
835 // Address mark not found for data field
836 /* TRK0 - Track 0 not found */
837 {0x02, HARDWARE_ERROR, 0x00, 0x00},
838 // Hardware error
839 /* Abort: 0x04 is not translated here, see below */
840 /* Media change request */
841 {0x08, NOT_READY, 0x04, 0x00},
842 // FIXME: faking offline
843 /* SRV/IDNF - ID not found */
844 {0x10, ILLEGAL_REQUEST, 0x21, 0x00},
845 // Logical address out of range
846 /* MC - Media Changed */
847 {0x20, UNIT_ATTENTION, 0x28, 0x00},
848 // Not ready to ready change, medium may have changed
849 /* ECC - Uncorrectable ECC error */
850 {0x40, MEDIUM_ERROR, 0x11, 0x04},
851 // Unrecovered read error
852 /* BBD - block marked bad */
853 {0x80, MEDIUM_ERROR, 0x11, 0x04},
854 // Block marked bad Medium error, unrecovered read error
855 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
856 };
857 static const unsigned char stat_table[][4] = {
858 /* Must be first because BUSY means no other bits valid */
859 {0x80, ABORTED_COMMAND, 0x47, 0x00},
860 // Busy, fake parity for now
861 {0x40, ILLEGAL_REQUEST, 0x21, 0x04},
862 // Device ready, unaligned write command
863 {0x20, HARDWARE_ERROR, 0x44, 0x00},
864 // Device fault, internal target failure
865 {0x08, ABORTED_COMMAND, 0x47, 0x00},
866 // Timed out in xfer, fake parity for now
867 {0x04, RECOVERED_ERROR, 0x11, 0x00},
868 // Recovered ECC error Medium error, recovered
869 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
870 };
871
872 /*
873 * Is this an error we can process/parse
874 */
875 if (drv_stat & ATA_BUSY) {
876 drv_err = 0; /* Ignore the err bits, they're invalid */
877 }
878
879 if (drv_err) {
880 /* Look for drv_err */
881 for (i = 0; sense_table[i][0] != 0xFF; i++) {
882 /* Look for best matches first */
883 if ((sense_table[i][0] & drv_err) ==
884 sense_table[i][0]) {
885 *sk = sense_table[i][1];
886 *asc = sense_table[i][2];
887 *ascq = sense_table[i][3];
888 return;
889 }
890 }
891 }
892
893 /*
894 * Fall back to interpreting status bits. Note that if the drv_err
895 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
896 * is not descriptive enough.
897 */
898 for (i = 0; stat_table[i][0] != 0xFF; i++) {
899 if (stat_table[i][0] & drv_stat) {
900 *sk = stat_table[i][1];
901 *asc = stat_table[i][2];
902 *ascq = stat_table[i][3];
903 return;
904 }
905 }
906
907 /*
908 * We need a sensible error return here, which is tricky, and one
909 * that won't cause people to do things like return a disk wrongly.
910 */
911 *sk = ABORTED_COMMAND;
912 *asc = 0x00;
913 *ascq = 0x00;
914}
915
916/*
917 * ata_gen_passthru_sense - Generate check condition sense block.
918 * @qc: Command that completed.
919 *
920 * This function is specific to the ATA pass through commands.
921 * Regardless of whether the command errored or not, return a sense
922 * block. If there was no error, we get the request from an ATA
923 * passthrough command, so we use the following sense data:
924 * sk = RECOVERED ERROR
925 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
926 *
927 *
928 * LOCKING:
929 * None.
930 */
931static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
932{
933 struct ata_device *dev = qc->dev;
934 struct scsi_cmnd *cmd = qc->scsicmd;
935 struct ata_taskfile *tf = &qc->result_tf;
936 u8 sense_key, asc, ascq;
937
938 if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
939 ata_dev_dbg(dev,
940 "missing result TF: can't generate ATA PT sense data\n");
941 return;
942 }
943
944 /*
945 * Use ata_to_sense_error() to map status register bits
946 * onto sense key, asc & ascq.
947 */
948 if (qc->err_mask ||
949 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
950 ata_to_sense_error(tf->status, tf->error,
951 &sense_key, &asc, &ascq);
952 ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
953 } else {
954 /*
955 * ATA PASS-THROUGH INFORMATION AVAILABLE
956 *
957 * Note: we are supposed to call ata_scsi_set_sense(), which
958 * respects the D_SENSE bit, instead of unconditionally
959 * generating the sense data in descriptor format. However,
960 * because hdparm, hddtemp, and udisks incorrectly assume sense
961 * data in descriptor format, without even looking at the
962 * RESPONSE CODE field in the returned sense data (to see which
963 * format the returned sense data is in), we are stuck with
964 * being bug compatible with older kernels.
965 */
966 scsi_build_sense(cmd, 1, RECOVERED_ERROR, 0, 0x1D);
967 }
968}
969
970/**
971 * ata_gen_ata_sense - generate a SCSI fixed sense block
972 * @qc: Command that we are erroring out
973 *
974 * Generate sense block for a failed ATA command @qc. Descriptor
975 * format is used to accommodate LBA48 block address.
976 *
977 * LOCKING:
978 * None.
979 */
980static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
981{
982 struct ata_device *dev = qc->dev;
983 struct scsi_cmnd *cmd = qc->scsicmd;
984 struct ata_taskfile *tf = &qc->result_tf;
985 unsigned char *sb = cmd->sense_buffer;
986 u64 block;
987 u8 sense_key, asc, ascq;
988
989 if (ata_dev_disabled(dev)) {
990 /* Device disabled after error recovery */
991 /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */
992 ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
993 return;
994 }
995
996 if (!(qc->flags & ATA_QCFLAG_RTF_FILLED)) {
997 ata_dev_dbg(dev,
998 "missing result TF: can't generate sense data\n");
999 return;
1000 }
1001
1002 /* Use ata_to_sense_error() to map status register bits
1003 * onto sense key, asc & ascq.
1004 */
1005 if (qc->err_mask ||
1006 tf->status & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
1007 ata_to_sense_error(tf->status, tf->error,
1008 &sense_key, &asc, &ascq);
1009 ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq);
1010 } else {
1011 /* Could not decode error */
1012 ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n",
1013 tf->status, qc->err_mask);
1014 ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0);
1015 return;
1016 }
1017
1018 block = ata_tf_read_block(&qc->result_tf, dev);
1019 if (block == U64_MAX)
1020 return;
1021
1022 scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
1023}
1024
1025void ata_scsi_sdev_config(struct scsi_device *sdev)
1026{
1027 sdev->use_10_for_rw = 1;
1028 sdev->use_10_for_ms = 1;
1029 sdev->no_write_same = 1;
1030
1031 /* Schedule policy is determined by ->qc_defer() callback and
1032 * it needs to see every deferred qc. Set dev_blocked to 1 to
1033 * prevent SCSI midlayer from automatically deferring
1034 * requests.
1035 */
1036 sdev->max_device_blocked = 1;
1037}
1038
1039/**
1040 * ata_scsi_dma_need_drain - Check whether data transfer may overflow
1041 * @rq: request to be checked
1042 *
1043 * ATAPI commands which transfer variable length data to host
1044 * might overflow due to application error or hardware bug. This
1045 * function checks whether overflow should be drained and ignored
1046 * for @request.
1047 *
1048 * LOCKING:
1049 * None.
1050 *
1051 * RETURNS:
1052 * 1 if ; otherwise, 0.
1053 */
1054bool ata_scsi_dma_need_drain(struct request *rq)
1055{
1056 struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
1057
1058 return atapi_cmd_type(scmd->cmnd[0]) == ATAPI_MISC;
1059}
1060EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain);
1061
1062int ata_scsi_dev_config(struct scsi_device *sdev, struct queue_limits *lim,
1063 struct ata_device *dev)
1064{
1065 int depth = 1;
1066
1067 if (!ata_id_has_unload(dev->id))
1068 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1069
1070 /* configure max sectors */
1071 dev->max_sectors = min(dev->max_sectors, sdev->host->max_sectors);
1072 lim->max_hw_sectors = dev->max_sectors;
1073
1074 if (dev->class == ATA_DEV_ATAPI) {
1075 sdev->sector_size = ATA_SECT_SIZE;
1076
1077 /* set DMA padding */
1078 lim->dma_pad_mask = ATA_DMA_PAD_SZ - 1;
1079
1080 /* make room for appending the drain */
1081 lim->max_segments--;
1082
1083 sdev->dma_drain_len = ATAPI_MAX_DRAIN;
1084 sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len, GFP_NOIO);
1085 if (!sdev->dma_drain_buf) {
1086 ata_dev_err(dev, "drain buffer allocation failed\n");
1087 return -ENOMEM;
1088 }
1089 } else {
1090 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1091
1092 /*
1093 * Ask the sd driver to issue START STOP UNIT on runtime suspend
1094 * and resume and shutdown only. For system level suspend/resume,
1095 * devices power state is handled directly by libata EH.
1096 * Given that disks are always spun up on system resume, also
1097 * make sure that the sd driver forces runtime suspended disks
1098 * to be resumed to correctly reflect the power state of the
1099 * device.
1100 */
1101 sdev->manage_runtime_start_stop = 1;
1102 sdev->manage_shutdown = 1;
1103 sdev->force_runtime_start_on_system_start = 1;
1104 }
1105
1106 /*
1107 * ata_pio_sectors() expects buffer for each sector to not cross
1108 * page boundary. Enforce it by requiring buffers to be sector
1109 * aligned, which works iff sector_size is not larger than
1110 * PAGE_SIZE. ATAPI devices also need the alignment as
1111 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1112 */
1113 if (sdev->sector_size > PAGE_SIZE)
1114 ata_dev_warn(dev,
1115 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1116 sdev->sector_size);
1117
1118 lim->dma_alignment = sdev->sector_size - 1;
1119
1120 if (dev->flags & ATA_DFLAG_AN)
1121 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1122
1123 if (ata_ncq_supported(dev))
1124 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1125 depth = min(ATA_MAX_QUEUE, depth);
1126 scsi_change_queue_depth(sdev, depth);
1127
1128 if (dev->flags & ATA_DFLAG_TRUSTED)
1129 sdev->security_supported = 1;
1130
1131 dev->sdev = sdev;
1132 return 0;
1133}
1134
1135/**
1136 * ata_scsi_slave_alloc - Early setup of SCSI device
1137 * @sdev: SCSI device to examine
1138 *
1139 * This is called from scsi_alloc_sdev() when the scsi device
1140 * associated with an ATA device is scanned on a port.
1141 *
1142 * LOCKING:
1143 * Defined by SCSI layer. We don't really care.
1144 */
1145
1146int ata_scsi_slave_alloc(struct scsi_device *sdev)
1147{
1148 struct ata_port *ap = ata_shost_to_port(sdev->host);
1149 struct device_link *link;
1150
1151 ata_scsi_sdev_config(sdev);
1152
1153 /*
1154 * Create a link from the ata_port device to the scsi device to ensure
1155 * that PM does suspend/resume in the correct order: the scsi device is
1156 * consumer (child) and the ata port the supplier (parent).
1157 */
1158 link = device_link_add(&sdev->sdev_gendev, &ap->tdev,
1159 DL_FLAG_STATELESS |
1160 DL_FLAG_PM_RUNTIME | DL_FLAG_RPM_ACTIVE);
1161 if (!link) {
1162 ata_port_err(ap, "Failed to create link to scsi device %s\n",
1163 dev_name(&sdev->sdev_gendev));
1164 return -ENODEV;
1165 }
1166
1167 return 0;
1168}
1169EXPORT_SYMBOL_GPL(ata_scsi_slave_alloc);
1170
1171/**
1172 * ata_scsi_device_configure - Set SCSI device attributes
1173 * @sdev: SCSI device to examine
1174 * @lim: queue limits
1175 *
1176 * This is called before we actually start reading
1177 * and writing to the device, to configure certain
1178 * SCSI mid-layer behaviors.
1179 *
1180 * LOCKING:
1181 * Defined by SCSI layer. We don't really care.
1182 */
1183
1184int ata_scsi_device_configure(struct scsi_device *sdev,
1185 struct queue_limits *lim)
1186{
1187 struct ata_port *ap = ata_shost_to_port(sdev->host);
1188 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1189
1190 if (dev)
1191 return ata_scsi_dev_config(sdev, lim, dev);
1192
1193 return 0;
1194}
1195EXPORT_SYMBOL_GPL(ata_scsi_device_configure);
1196
1197/**
1198 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1199 * @sdev: SCSI device to be destroyed
1200 *
1201 * @sdev is about to be destroyed for hot/warm unplugging. If
1202 * this unplugging was initiated by libata as indicated by NULL
1203 * dev->sdev, this function doesn't have to do anything.
1204 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1205 * Clear dev->sdev, schedule the device for ATA detach and invoke
1206 * EH.
1207 *
1208 * LOCKING:
1209 * Defined by SCSI layer. We don't really care.
1210 */
1211void ata_scsi_slave_destroy(struct scsi_device *sdev)
1212{
1213 struct ata_port *ap = ata_shost_to_port(sdev->host);
1214 unsigned long flags;
1215 struct ata_device *dev;
1216
1217 device_link_remove(&sdev->sdev_gendev, &ap->tdev);
1218
1219 spin_lock_irqsave(ap->lock, flags);
1220 dev = __ata_scsi_find_dev(ap, sdev);
1221 if (dev && dev->sdev) {
1222 /* SCSI device already in CANCEL state, no need to offline it */
1223 dev->sdev = NULL;
1224 dev->flags |= ATA_DFLAG_DETACH;
1225 ata_port_schedule_eh(ap);
1226 }
1227 spin_unlock_irqrestore(ap->lock, flags);
1228
1229 kfree(sdev->dma_drain_buf);
1230}
1231EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
1232
1233/**
1234 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1235 * @qc: Storage for translated ATA taskfile
1236 *
1237 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1238 * (to start). Perhaps these commands should be preceded by
1239 * CHECK POWER MODE to see what power mode the device is already in.
1240 * [See SAT revision 5 at www.t10.org]
1241 *
1242 * LOCKING:
1243 * spin_lock_irqsave(host lock)
1244 *
1245 * RETURNS:
1246 * Zero on success, non-zero on error.
1247 */
1248static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1249{
1250 struct scsi_cmnd *scmd = qc->scsicmd;
1251 const u8 *cdb = scmd->cmnd;
1252 u16 fp;
1253 u8 bp = 0xff;
1254
1255 if (scmd->cmd_len < 5) {
1256 fp = 4;
1257 goto invalid_fld;
1258 }
1259
1260 /* LOEJ bit set not supported */
1261 if (cdb[4] & 0x2) {
1262 fp = 4;
1263 bp = 1;
1264 goto invalid_fld;
1265 }
1266
1267 /* Power conditions not supported */
1268 if (((cdb[4] >> 4) & 0xf) != 0) {
1269 fp = 4;
1270 bp = 3;
1271 goto invalid_fld;
1272 }
1273
1274 /* Ignore IMMED bit (cdb[1] & 0x1), violates sat-r05 */
1275 if (!ata_dev_power_init_tf(qc->dev, &qc->tf, cdb[4] & 0x1)) {
1276 ata_scsi_set_sense(qc->dev, scmd, ABORTED_COMMAND, 0, 0);
1277 return 1;
1278 }
1279
1280 /*
1281 * Standby and Idle condition timers could be implemented but that
1282 * would require libata to implement the Power condition mode page
1283 * and allow the user to change it. Changing mode pages requires
1284 * MODE SELECT to be implemented.
1285 */
1286
1287 return 0;
1288
1289 invalid_fld:
1290 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
1291 return 1;
1292}
1293
1294/**
1295 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1296 * @qc: Storage for translated ATA taskfile
1297 *
1298 * Sets up an ATA taskfile to issue FLUSH CACHE or
1299 * FLUSH CACHE EXT.
1300 *
1301 * LOCKING:
1302 * spin_lock_irqsave(host lock)
1303 *
1304 * RETURNS:
1305 * Zero on success, non-zero on error.
1306 */
1307static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1308{
1309 struct ata_taskfile *tf = &qc->tf;
1310
1311 tf->flags |= ATA_TFLAG_DEVICE;
1312 tf->protocol = ATA_PROT_NODATA;
1313
1314 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1315 tf->command = ATA_CMD_FLUSH_EXT;
1316 else
1317 tf->command = ATA_CMD_FLUSH;
1318
1319 /* flush is critical for IO integrity, consider it an IO command */
1320 qc->flags |= ATA_QCFLAG_IO;
1321
1322 return 0;
1323}
1324
1325/**
1326 * scsi_6_lba_len - Get LBA and transfer length
1327 * @cdb: SCSI command to translate
1328 *
1329 * Calculate LBA and transfer length for 6-byte commands.
1330 *
1331 * RETURNS:
1332 * @plba: the LBA
1333 * @plen: the transfer length
1334 */
1335static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1336{
1337 *plba = get_unaligned_be24(&cdb[1]) & 0x1fffff;
1338 *plen = cdb[4];
1339}
1340
1341/**
1342 * scsi_10_lba_len - Get LBA and transfer length
1343 * @cdb: SCSI command to translate
1344 *
1345 * Calculate LBA and transfer length for 10-byte commands.
1346 *
1347 * RETURNS:
1348 * @plba: the LBA
1349 * @plen: the transfer length
1350 */
1351static inline void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1352{
1353 *plba = get_unaligned_be32(&cdb[2]);
1354 *plen = get_unaligned_be16(&cdb[7]);
1355}
1356
1357/**
1358 * scsi_16_lba_len - Get LBA and transfer length
1359 * @cdb: SCSI command to translate
1360 *
1361 * Calculate LBA and transfer length for 16-byte commands.
1362 *
1363 * RETURNS:
1364 * @plba: the LBA
1365 * @plen: the transfer length
1366 */
1367static inline void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1368{
1369 *plba = get_unaligned_be64(&cdb[2]);
1370 *plen = get_unaligned_be32(&cdb[10]);
1371}
1372
1373/**
1374 * scsi_dld - Get duration limit descriptor index
1375 * @cdb: SCSI command to translate
1376 *
1377 * Returns the dld bits indicating the index of a command duration limit
1378 * descriptor.
1379 */
1380static inline int scsi_dld(const u8 *cdb)
1381{
1382 return ((cdb[1] & 0x01) << 2) | ((cdb[14] >> 6) & 0x03);
1383}
1384
1385/**
1386 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1387 * @qc: Storage for translated ATA taskfile
1388 *
1389 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1390 *
1391 * LOCKING:
1392 * spin_lock_irqsave(host lock)
1393 *
1394 * RETURNS:
1395 * Zero on success, non-zero on error.
1396 */
1397static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1398{
1399 struct scsi_cmnd *scmd = qc->scsicmd;
1400 struct ata_taskfile *tf = &qc->tf;
1401 struct ata_device *dev = qc->dev;
1402 u64 dev_sectors = qc->dev->n_sectors;
1403 const u8 *cdb = scmd->cmnd;
1404 u64 block;
1405 u32 n_block;
1406 u16 fp;
1407
1408 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1409 tf->protocol = ATA_PROT_NODATA;
1410
1411 switch (cdb[0]) {
1412 case VERIFY:
1413 if (scmd->cmd_len < 10) {
1414 fp = 9;
1415 goto invalid_fld;
1416 }
1417 scsi_10_lba_len(cdb, &block, &n_block);
1418 break;
1419 case VERIFY_16:
1420 if (scmd->cmd_len < 16) {
1421 fp = 15;
1422 goto invalid_fld;
1423 }
1424 scsi_16_lba_len(cdb, &block, &n_block);
1425 break;
1426 default:
1427 fp = 0;
1428 goto invalid_fld;
1429 }
1430
1431 if (!n_block)
1432 goto nothing_to_do;
1433 if (block >= dev_sectors)
1434 goto out_of_range;
1435 if ((block + n_block) > dev_sectors)
1436 goto out_of_range;
1437
1438 if (dev->flags & ATA_DFLAG_LBA) {
1439 tf->flags |= ATA_TFLAG_LBA;
1440
1441 if (lba_28_ok(block, n_block)) {
1442 /* use LBA28 */
1443 tf->command = ATA_CMD_VERIFY;
1444 tf->device |= (block >> 24) & 0xf;
1445 } else if (lba_48_ok(block, n_block)) {
1446 if (!(dev->flags & ATA_DFLAG_LBA48))
1447 goto out_of_range;
1448
1449 /* use LBA48 */
1450 tf->flags |= ATA_TFLAG_LBA48;
1451 tf->command = ATA_CMD_VERIFY_EXT;
1452
1453 tf->hob_nsect = (n_block >> 8) & 0xff;
1454
1455 tf->hob_lbah = (block >> 40) & 0xff;
1456 tf->hob_lbam = (block >> 32) & 0xff;
1457 tf->hob_lbal = (block >> 24) & 0xff;
1458 } else
1459 /* request too large even for LBA48 */
1460 goto out_of_range;
1461
1462 tf->nsect = n_block & 0xff;
1463
1464 tf->lbah = (block >> 16) & 0xff;
1465 tf->lbam = (block >> 8) & 0xff;
1466 tf->lbal = block & 0xff;
1467
1468 tf->device |= ATA_LBA;
1469 } else {
1470 /* CHS */
1471 u32 sect, head, cyl, track;
1472
1473 if (!lba_28_ok(block, n_block))
1474 goto out_of_range;
1475
1476 /* Convert LBA to CHS */
1477 track = (u32)block / dev->sectors;
1478 cyl = track / dev->heads;
1479 head = track % dev->heads;
1480 sect = (u32)block % dev->sectors + 1;
1481
1482 /* Check whether the converted CHS can fit.
1483 Cylinder: 0-65535
1484 Head: 0-15
1485 Sector: 1-255*/
1486 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1487 goto out_of_range;
1488
1489 tf->command = ATA_CMD_VERIFY;
1490 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1491 tf->lbal = sect;
1492 tf->lbam = cyl;
1493 tf->lbah = cyl >> 8;
1494 tf->device |= head;
1495 }
1496
1497 return 0;
1498
1499invalid_fld:
1500 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1501 return 1;
1502
1503out_of_range:
1504 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1505 /* "Logical Block Address out of range" */
1506 return 1;
1507
1508nothing_to_do:
1509 scmd->result = SAM_STAT_GOOD;
1510 return 1;
1511}
1512
1513static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks)
1514{
1515 struct request *rq = scsi_cmd_to_rq(scmd);
1516 u32 req_blocks;
1517
1518 if (!blk_rq_is_passthrough(rq))
1519 return true;
1520
1521 req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size;
1522 if (n_blocks > req_blocks)
1523 return false;
1524
1525 return true;
1526}
1527
1528/**
1529 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1530 * @qc: Storage for translated ATA taskfile
1531 *
1532 * Converts any of six SCSI read/write commands into the
1533 * ATA counterpart, including starting sector (LBA),
1534 * sector count, and taking into account the device's LBA48
1535 * support.
1536 *
1537 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1538 * %WRITE_16 are currently supported.
1539 *
1540 * LOCKING:
1541 * spin_lock_irqsave(host lock)
1542 *
1543 * RETURNS:
1544 * Zero on success, non-zero on error.
1545 */
1546static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1547{
1548 struct scsi_cmnd *scmd = qc->scsicmd;
1549 const u8 *cdb = scmd->cmnd;
1550 struct request *rq = scsi_cmd_to_rq(scmd);
1551 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
1552 unsigned int tf_flags = 0;
1553 int dld = 0;
1554 u64 block;
1555 u32 n_block;
1556 int rc;
1557 u16 fp = 0;
1558
1559 switch (cdb[0]) {
1560 case WRITE_6:
1561 case WRITE_10:
1562 case WRITE_16:
1563 tf_flags |= ATA_TFLAG_WRITE;
1564 break;
1565 }
1566
1567 /* Calculate the SCSI LBA, transfer length and FUA. */
1568 switch (cdb[0]) {
1569 case READ_10:
1570 case WRITE_10:
1571 if (unlikely(scmd->cmd_len < 10)) {
1572 fp = 9;
1573 goto invalid_fld;
1574 }
1575 scsi_10_lba_len(cdb, &block, &n_block);
1576 if (cdb[1] & (1 << 3))
1577 tf_flags |= ATA_TFLAG_FUA;
1578 if (!ata_check_nblocks(scmd, n_block))
1579 goto invalid_fld;
1580 break;
1581 case READ_6:
1582 case WRITE_6:
1583 if (unlikely(scmd->cmd_len < 6)) {
1584 fp = 5;
1585 goto invalid_fld;
1586 }
1587 scsi_6_lba_len(cdb, &block, &n_block);
1588
1589 /* for 6-byte r/w commands, transfer length 0
1590 * means 256 blocks of data, not 0 block.
1591 */
1592 if (!n_block)
1593 n_block = 256;
1594 if (!ata_check_nblocks(scmd, n_block))
1595 goto invalid_fld;
1596 break;
1597 case READ_16:
1598 case WRITE_16:
1599 if (unlikely(scmd->cmd_len < 16)) {
1600 fp = 15;
1601 goto invalid_fld;
1602 }
1603 scsi_16_lba_len(cdb, &block, &n_block);
1604 dld = scsi_dld(cdb);
1605 if (cdb[1] & (1 << 3))
1606 tf_flags |= ATA_TFLAG_FUA;
1607 if (!ata_check_nblocks(scmd, n_block))
1608 goto invalid_fld;
1609 break;
1610 default:
1611 fp = 0;
1612 goto invalid_fld;
1613 }
1614
1615 /* Check and compose ATA command */
1616 if (!n_block)
1617 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1618 * length 0 means transfer 0 block of data.
1619 * However, for ATA R/W commands, sector count 0 means
1620 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1621 *
1622 * WARNING: one or two older ATA drives treat 0 as 0...
1623 */
1624 goto nothing_to_do;
1625
1626 qc->flags |= ATA_QCFLAG_IO;
1627 qc->nbytes = n_block * scmd->device->sector_size;
1628
1629 rc = ata_build_rw_tf(qc, block, n_block, tf_flags, dld, class);
1630 if (likely(rc == 0))
1631 return 0;
1632
1633 if (rc == -ERANGE)
1634 goto out_of_range;
1635 /* treat all other errors as -EINVAL, fall through */
1636invalid_fld:
1637 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1638 return 1;
1639
1640out_of_range:
1641 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1642 /* "Logical Block Address out of range" */
1643 return 1;
1644
1645nothing_to_do:
1646 scmd->result = SAM_STAT_GOOD;
1647 return 1;
1648}
1649
1650static void ata_qc_done(struct ata_queued_cmd *qc)
1651{
1652 struct scsi_cmnd *cmd = qc->scsicmd;
1653 void (*done)(struct scsi_cmnd *) = qc->scsidone;
1654
1655 ata_qc_free(qc);
1656 done(cmd);
1657}
1658
1659static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1660{
1661 struct scsi_cmnd *cmd = qc->scsicmd;
1662 u8 *cdb = cmd->cmnd;
1663 bool have_sense = qc->flags & ATA_QCFLAG_SENSE_VALID;
1664 bool is_ata_passthru = cdb[0] == ATA_16 || cdb[0] == ATA_12;
1665 bool is_ck_cond_request = cdb[2] & 0x20;
1666 bool is_error = qc->err_mask != 0;
1667
1668 /* For ATA pass thru (SAT) commands, generate a sense block if
1669 * user mandated it or if there's an error. Note that if we
1670 * generate because the user forced us to [CK_COND=1], a check
1671 * condition is generated and the ATA register values are returned
1672 * whether the command completed successfully or not. If there
1673 * was no error, and CK_COND=1, we use the following sense data:
1674 * sk = RECOVERED ERROR
1675 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1676 */
1677 if (is_ata_passthru && (is_ck_cond_request || is_error || have_sense)) {
1678 if (!have_sense)
1679 ata_gen_passthru_sense(qc);
1680 ata_scsi_set_passthru_sense_fields(qc);
1681 if (is_ck_cond_request)
1682 set_status_byte(qc->scsicmd, SAM_STAT_CHECK_CONDITION);
1683 } else if (is_error && !have_sense) {
1684 ata_gen_ata_sense(qc);
1685 }
1686
1687 ata_qc_done(qc);
1688}
1689
1690/**
1691 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1692 * @dev: ATA device to which the command is addressed
1693 * @cmd: SCSI command to execute
1694 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1695 *
1696 * Our ->queuecommand() function has decided that the SCSI
1697 * command issued can be directly translated into an ATA
1698 * command, rather than handled internally.
1699 *
1700 * This function sets up an ata_queued_cmd structure for the
1701 * SCSI command, and sends that ata_queued_cmd to the hardware.
1702 *
1703 * The xlat_func argument (actor) returns 0 if ready to execute
1704 * ATA command, else 1 to finish translation. If 1 is returned
1705 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1706 * to be set reflecting an error condition or clean (early)
1707 * termination.
1708 *
1709 * LOCKING:
1710 * spin_lock_irqsave(host lock)
1711 *
1712 * RETURNS:
1713 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1714 * needs to be deferred.
1715 */
1716static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1717 ata_xlat_func_t xlat_func)
1718{
1719 struct ata_port *ap = dev->link->ap;
1720 struct ata_queued_cmd *qc;
1721 int rc;
1722
1723 qc = ata_scsi_qc_new(dev, cmd);
1724 if (!qc)
1725 goto err_mem;
1726
1727 /* data is present; dma-map it */
1728 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1729 cmd->sc_data_direction == DMA_TO_DEVICE) {
1730 if (unlikely(scsi_bufflen(cmd) < 1)) {
1731 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1732 goto err_did;
1733 }
1734
1735 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1736
1737 qc->dma_dir = cmd->sc_data_direction;
1738 }
1739
1740 qc->complete_fn = ata_scsi_qc_complete;
1741
1742 if (xlat_func(qc))
1743 goto early_finish;
1744
1745 if (ap->ops->qc_defer) {
1746 if ((rc = ap->ops->qc_defer(qc)))
1747 goto defer;
1748 }
1749
1750 /* select device, send command to hardware */
1751 ata_qc_issue(qc);
1752
1753 return 0;
1754
1755early_finish:
1756 ata_qc_free(qc);
1757 scsi_done(cmd);
1758 return 0;
1759
1760err_did:
1761 ata_qc_free(qc);
1762 cmd->result = (DID_ERROR << 16);
1763 scsi_done(cmd);
1764err_mem:
1765 return 0;
1766
1767defer:
1768 ata_qc_free(qc);
1769 if (rc == ATA_DEFER_LINK)
1770 return SCSI_MLQUEUE_DEVICE_BUSY;
1771 else
1772 return SCSI_MLQUEUE_HOST_BUSY;
1773}
1774
1775/**
1776 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1777 * @dev: Target device.
1778 * @cmd: SCSI command of interest.
1779 * @actor: Callback hook for desired SCSI command simulator
1780 *
1781 * Takes care of the hard work of simulating a SCSI command...
1782 * Mapping the response buffer, calling the command's handler,
1783 * and handling the handler's return value. This return value
1784 * indicates whether the handler wishes the SCSI command to be
1785 * completed successfully (0), or not (in which case cmd->result
1786 * and sense buffer are assumed to be set).
1787 *
1788 * LOCKING:
1789 * spin_lock_irqsave(host lock)
1790 */
1791static void ata_scsi_rbuf_fill(struct ata_device *dev, struct scsi_cmnd *cmd,
1792 unsigned int (*actor)(struct ata_device *dev,
1793 struct scsi_cmnd *cmd, u8 *rbuf))
1794{
1795 unsigned long flags;
1796 unsigned int len;
1797
1798 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
1799
1800 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1801 len = actor(dev, cmd, ata_scsi_rbuf);
1802 if (len) {
1803 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1804 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1805 cmd->result = SAM_STAT_GOOD;
1806 if (scsi_bufflen(cmd) > len)
1807 scsi_set_resid(cmd, scsi_bufflen(cmd) - len);
1808 }
1809
1810 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
1811}
1812
1813/**
1814 * ata_scsiop_inq_std - Simulate standard INQUIRY command
1815 * @dev: Target device.
1816 * @cmd: SCSI command of interest.
1817 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1818 *
1819 * Returns standard device identification data associated
1820 * with non-VPD INQUIRY command output.
1821 *
1822 * LOCKING:
1823 * spin_lock_irqsave(host lock)
1824 */
1825static unsigned int ata_scsiop_inq_std(struct ata_device *dev,
1826 struct scsi_cmnd *cmd, u8 *rbuf)
1827{
1828 static const u8 versions[] = {
1829 0x00,
1830 0x60, /* SAM-3 (no version claimed) */
1831
1832 0x03,
1833 0x20, /* SBC-2 (no version claimed) */
1834
1835 0x03,
1836 0x00 /* SPC-3 (no version claimed) */
1837 };
1838 static const u8 versions_zbc[] = {
1839 0x00,
1840 0xA0, /* SAM-5 (no version claimed) */
1841
1842 0x06,
1843 0x00, /* SBC-4 (no version claimed) */
1844
1845 0x05,
1846 0xC0, /* SPC-5 (no version claimed) */
1847
1848 0x60,
1849 0x24, /* ZBC r05 */
1850 };
1851
1852 u8 hdr[] = {
1853 TYPE_DISK,
1854 0,
1855 0x5, /* claim SPC-3 version compatibility */
1856 2,
1857 95 - 4,
1858 0,
1859 0,
1860 2
1861 };
1862
1863 /*
1864 * Set the SCSI Removable Media Bit (RMB) if the ATA removable media
1865 * device bit (obsolete since ATA-8 ACS) is set.
1866 */
1867 if (ata_id_removable(dev->id))
1868 hdr[1] |= (1 << 7);
1869
1870 if (dev->class == ATA_DEV_ZAC) {
1871 hdr[0] = TYPE_ZBC;
1872 hdr[2] = 0x7; /* claim SPC-5 version compatibility */
1873 }
1874
1875 if (dev->flags & ATA_DFLAG_CDL)
1876 hdr[2] = 0xd; /* claim SPC-6 version compatibility */
1877
1878 memcpy(rbuf, hdr, sizeof(hdr));
1879 memcpy(&rbuf[8], "ATA ", 8);
1880 ata_id_string(dev->id, &rbuf[16], ATA_ID_PROD, 16);
1881
1882 /* From SAT, use last 2 words from fw rev unless they are spaces */
1883 ata_id_string(dev->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
1884 if (strncmp(&rbuf[32], " ", 4) == 0)
1885 ata_id_string(dev->id, &rbuf[32], ATA_ID_FW_REV, 4);
1886
1887 if (rbuf[32] == 0 || rbuf[32] == ' ')
1888 memcpy(&rbuf[32], "n/a ", 4);
1889
1890 if (ata_id_zoned_cap(dev->id) || dev->class == ATA_DEV_ZAC)
1891 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
1892 else
1893 memcpy(rbuf + 58, versions, sizeof(versions));
1894
1895 /*
1896 * Include all 8 possible version descriptors, even if not all of
1897 * them are popoulated.
1898 */
1899 return 96;
1900}
1901
1902/**
1903 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1904 * @dev: Target device.
1905 * @cmd: SCSI command of interest.
1906 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1907 *
1908 * Returns list of inquiry VPD pages available.
1909 *
1910 * LOCKING:
1911 * spin_lock_irqsave(host lock)
1912 */
1913static unsigned int ata_scsiop_inq_00(struct ata_device *dev,
1914 struct scsi_cmnd *cmd, u8 *rbuf)
1915{
1916 int i, num_pages = 0;
1917 static const u8 pages[] = {
1918 0x00, /* page 0x00, this page */
1919 0x80, /* page 0x80, unit serial no page */
1920 0x83, /* page 0x83, device ident page */
1921 0x89, /* page 0x89, ata info page */
1922 0xb0, /* page 0xb0, block limits page */
1923 0xb1, /* page 0xb1, block device characteristics page */
1924 0xb2, /* page 0xb2, thin provisioning page */
1925 0xb6, /* page 0xb6, zoned block device characteristics */
1926 0xb9, /* page 0xb9, concurrent positioning ranges */
1927 };
1928
1929 for (i = 0; i < sizeof(pages); i++) {
1930 if (pages[i] == 0xb6 &&
1931 !(dev->flags & ATA_DFLAG_ZAC))
1932 continue;
1933 rbuf[num_pages + 4] = pages[i];
1934 num_pages++;
1935 }
1936 rbuf[3] = num_pages; /* number of supported VPD pages */
1937
1938 return get_unaligned_be16(&rbuf[2]) + 4;
1939}
1940
1941/**
1942 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1943 * @dev: Target device.
1944 * @cmd: SCSI command of interest.
1945 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1946 *
1947 * Returns ATA device serial number.
1948 *
1949 * LOCKING:
1950 * spin_lock_irqsave(host lock)
1951 */
1952static unsigned int ata_scsiop_inq_80(struct ata_device *dev,
1953 struct scsi_cmnd *cmd, u8 *rbuf)
1954{
1955 static const u8 hdr[] = {
1956 0,
1957 0x80, /* this page code */
1958 0,
1959 ATA_ID_SERNO_LEN, /* page len */
1960 };
1961
1962 memcpy(rbuf, hdr, sizeof(hdr));
1963 ata_id_string(dev->id, (unsigned char *) &rbuf[4],
1964 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1965
1966 return get_unaligned_be16(&rbuf[2]) + 4;
1967}
1968
1969/**
1970 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1971 * @dev: Target device.
1972 * @cmd: SCSI command of interest.
1973 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1974 *
1975 * Yields two logical unit device identification designators:
1976 * - vendor specific ASCII containing the ATA serial number
1977 * - SAT defined "t10 vendor id based" containing ASCII vendor
1978 * name ("ATA "), model and serial numbers.
1979 *
1980 * LOCKING:
1981 * spin_lock_irqsave(host lock)
1982 */
1983static unsigned int ata_scsiop_inq_83(struct ata_device *dev,
1984 struct scsi_cmnd *cmd, u8 *rbuf)
1985{
1986 const int sat_model_serial_desc_len = 68;
1987 int num;
1988
1989 rbuf[1] = 0x83; /* this page code */
1990 num = 4;
1991
1992 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
1993 rbuf[num + 0] = 2;
1994 rbuf[num + 3] = ATA_ID_SERNO_LEN;
1995 num += 4;
1996 ata_id_string(dev->id, (unsigned char *) rbuf + num,
1997 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1998 num += ATA_ID_SERNO_LEN;
1999
2000 /* SAT defined lu model and serial numbers descriptor */
2001 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2002 rbuf[num + 0] = 2;
2003 rbuf[num + 1] = 1;
2004 rbuf[num + 3] = sat_model_serial_desc_len;
2005 num += 4;
2006 memcpy(rbuf + num, "ATA ", 8);
2007 num += 8;
2008 ata_id_string(dev->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2009 ATA_ID_PROD_LEN);
2010 num += ATA_ID_PROD_LEN;
2011 ata_id_string(dev->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2012 ATA_ID_SERNO_LEN);
2013 num += ATA_ID_SERNO_LEN;
2014
2015 if (ata_id_has_wwn(dev->id)) {
2016 /* SAT defined lu world wide name */
2017 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2018 rbuf[num + 0] = 1;
2019 rbuf[num + 1] = 3;
2020 rbuf[num + 3] = ATA_ID_WWN_LEN;
2021 num += 4;
2022 ata_id_string(dev->id, (unsigned char *) rbuf + num,
2023 ATA_ID_WWN, ATA_ID_WWN_LEN);
2024 num += ATA_ID_WWN_LEN;
2025 }
2026 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2027
2028 return get_unaligned_be16(&rbuf[2]) + 4;
2029}
2030
2031/**
2032 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2033 * @dev: Target device.
2034 * @cmd: SCSI command of interest.
2035 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2036 *
2037 * Yields SAT-specified ATA VPD page.
2038 *
2039 * LOCKING:
2040 * spin_lock_irqsave(host lock)
2041 */
2042static unsigned int ata_scsiop_inq_89(struct ata_device *dev,
2043 struct scsi_cmnd *cmd, u8 *rbuf)
2044{
2045 rbuf[1] = 0x89; /* our page code */
2046 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2047 rbuf[3] = (0x238 & 0xff);
2048
2049 memcpy(&rbuf[8], "linux ", 8);
2050 memcpy(&rbuf[16], "libata ", 16);
2051 memcpy(&rbuf[32], DRV_VERSION, 4);
2052
2053 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2054 rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */
2055 /* TODO: PMP? */
2056
2057 /* we don't store the ATA device signature, so we fake it */
2058 rbuf[38] = ATA_DRDY; /* really, this is Status reg */
2059 rbuf[40] = 0x1;
2060 rbuf[48] = 0x1;
2061
2062 rbuf[56] = ATA_CMD_ID_ATA;
2063
2064 memcpy(&rbuf[60], &dev->id[0], 512);
2065
2066 return get_unaligned_be16(&rbuf[2]) + 4;
2067}
2068
2069/**
2070 * ata_scsiop_inq_b0 - Simulate INQUIRY VPD page B0, Block Limits
2071 * @dev: Target device.
2072 * @cmd: SCSI command of interest.
2073 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2074 *
2075 * Return data for the VPD page B0h (Block Limits).
2076 *
2077 * LOCKING:
2078 * spin_lock_irqsave(host lock)
2079 */
2080static unsigned int ata_scsiop_inq_b0(struct ata_device *dev,
2081 struct scsi_cmnd *cmd, u8 *rbuf)
2082{
2083 u16 min_io_sectors;
2084
2085 rbuf[1] = 0xb0;
2086 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2087
2088 /*
2089 * Optimal transfer length granularity.
2090 *
2091 * This is always one physical block, but for disks with a smaller
2092 * logical than physical sector size we need to figure out what the
2093 * latter is.
2094 */
2095 min_io_sectors = 1 << ata_id_log2_per_physical_sector(dev->id);
2096 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2097
2098 /*
2099 * Optimal unmap granularity.
2100 *
2101 * The ATA spec doesn't even know about a granularity or alignment
2102 * for the TRIM command. We can leave away most of the unmap related
2103 * VPD page entries, but we have specifify a granularity to signal
2104 * that we support some form of unmap - in thise case via WRITE SAME
2105 * with the unmap bit set.
2106 */
2107 if (ata_id_has_trim(dev->id)) {
2108 u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM;
2109
2110 if (dev->quirks & ATA_QUIRK_MAX_TRIM_128M)
2111 max_blocks = 128 << (20 - SECTOR_SHIFT);
2112
2113 put_unaligned_be64(max_blocks, &rbuf[36]);
2114 put_unaligned_be32(1, &rbuf[28]);
2115 }
2116
2117 return get_unaligned_be16(&rbuf[2]) + 4;
2118}
2119
2120/**
2121 * ata_scsiop_inq_b1 - Simulate INQUIRY VPD page B1, Block Device
2122 * Characteristics
2123 * @dev: Target device.
2124 * @cmd: SCSI command of interest.
2125 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2126 *
2127 * Return data for the VPD page B1h (Block Device Characteristics).
2128 *
2129 * LOCKING:
2130 * spin_lock_irqsave(host lock)
2131 */
2132static unsigned int ata_scsiop_inq_b1(struct ata_device *dev,
2133 struct scsi_cmnd *cmd, u8 *rbuf)
2134{
2135 int form_factor = ata_id_form_factor(dev->id);
2136 int media_rotation_rate = ata_id_rotation_rate(dev->id);
2137 u8 zoned = ata_id_zoned_cap(dev->id);
2138
2139 rbuf[1] = 0xb1;
2140 rbuf[3] = 0x3c;
2141 rbuf[4] = media_rotation_rate >> 8;
2142 rbuf[5] = media_rotation_rate;
2143 rbuf[7] = form_factor;
2144 if (zoned)
2145 rbuf[8] = (zoned << 4);
2146
2147 return get_unaligned_be16(&rbuf[2]) + 4;
2148}
2149
2150/**
2151 * ata_scsiop_inq_b2 - Simulate INQUIRY VPD page B2, Logical Block
2152 * Provisioning
2153 * @dev: Target device.
2154 * @cmd: SCSI command of interest.
2155 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2156 *
2157 * Return data for the VPD page B2h (Logical Block Provisioning).
2158 *
2159 * LOCKING:
2160 * spin_lock_irqsave(host lock)
2161 */
2162static unsigned int ata_scsiop_inq_b2(struct ata_device *dev,
2163 struct scsi_cmnd *cmd, u8 *rbuf)
2164{
2165 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2166 rbuf[1] = 0xb2;
2167 rbuf[3] = 0x4;
2168 rbuf[5] = 1 << 6; /* TPWS */
2169
2170 return get_unaligned_be16(&rbuf[2]) + 4;
2171}
2172
2173/**
2174 * ata_scsiop_inq_b6 - Simulate INQUIRY VPD page B6, Zoned Block Device
2175 * Characteristics
2176 * @dev: Target device.
2177 * @cmd: SCSI command of interest.
2178 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2179 *
2180 * Return data for the VPD page B2h (Zoned Block Device Characteristics).
2181 *
2182 * LOCKING:
2183 * spin_lock_irqsave(host lock)
2184 */
2185static unsigned int ata_scsiop_inq_b6(struct ata_device *dev,
2186 struct scsi_cmnd *cmd, u8 *rbuf)
2187{
2188 if (!(dev->flags & ATA_DFLAG_ZAC)) {
2189 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
2190 return 0;
2191 }
2192
2193 /*
2194 * zbc-r05 SCSI Zoned Block device characteristics VPD page
2195 */
2196 rbuf[1] = 0xb6;
2197 rbuf[3] = 0x3C;
2198
2199 /*
2200 * URSWRZ bit is only meaningful for host-managed ZAC drives
2201 */
2202 if (dev->zac_zoned_cap & 1)
2203 rbuf[4] |= 1;
2204 put_unaligned_be32(dev->zac_zones_optimal_open, &rbuf[8]);
2205 put_unaligned_be32(dev->zac_zones_optimal_nonseq, &rbuf[12]);
2206 put_unaligned_be32(dev->zac_zones_max_open, &rbuf[16]);
2207
2208 return get_unaligned_be16(&rbuf[2]) + 4;
2209}
2210
2211/**
2212 * ata_scsiop_inq_b9 - Simulate INQUIRY VPD page B9, Concurrent Positioning
2213 * Ranges
2214 * @dev: Target device.
2215 * @cmd: SCSI command of interest.
2216 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2217 *
2218 * Return data for the VPD page B9h (Concurrent Positioning Ranges).
2219 *
2220 * LOCKING:
2221 * spin_lock_irqsave(host lock)
2222 */
2223static unsigned int ata_scsiop_inq_b9(struct ata_device *dev,
2224 struct scsi_cmnd *cmd, u8 *rbuf)
2225{
2226 struct ata_cpr_log *cpr_log = dev->cpr_log;
2227 u8 *desc = &rbuf[64];
2228 int i;
2229
2230 if (!cpr_log) {
2231 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
2232 return 0;
2233 }
2234
2235 /* SCSI Concurrent Positioning Ranges VPD page: SBC-5 rev 1 or later */
2236 rbuf[1] = 0xb9;
2237 put_unaligned_be16(64 + (int)cpr_log->nr_cpr * 32 - 4, &rbuf[2]);
2238
2239 for (i = 0; i < cpr_log->nr_cpr; i++, desc += 32) {
2240 desc[0] = cpr_log->cpr[i].num;
2241 desc[1] = cpr_log->cpr[i].num_storage_elements;
2242 put_unaligned_be64(cpr_log->cpr[i].start_lba, &desc[8]);
2243 put_unaligned_be64(cpr_log->cpr[i].num_lbas, &desc[16]);
2244 }
2245
2246 return get_unaligned_be16(&rbuf[2]) + 4;
2247}
2248
2249/**
2250 * ata_scsiop_inquiry - Simulate INQUIRY command
2251 * @dev: Target device.
2252 * @cmd: SCSI command of interest.
2253 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2254 *
2255 * Returns data associated with an INQUIRY command output.
2256 *
2257 * LOCKING:
2258 * spin_lock_irqsave(host lock)
2259 */
2260static unsigned int ata_scsiop_inquiry(struct ata_device *dev,
2261 struct scsi_cmnd *cmd, u8 *rbuf)
2262{
2263 const u8 *scsicmd = cmd->cmnd;
2264
2265 /* is CmdDt set? */
2266 if (scsicmd[1] & 2) {
2267 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
2268 return 0;
2269 }
2270
2271 /* Is EVPD clear? */
2272 if ((scsicmd[1] & 1) == 0)
2273 return ata_scsiop_inq_std(dev, cmd, rbuf);
2274
2275 switch (scsicmd[2]) {
2276 case 0x00:
2277 return ata_scsiop_inq_00(dev, cmd, rbuf);
2278 case 0x80:
2279 return ata_scsiop_inq_80(dev, cmd, rbuf);
2280 case 0x83:
2281 return ata_scsiop_inq_83(dev, cmd, rbuf);
2282 case 0x89:
2283 return ata_scsiop_inq_89(dev, cmd, rbuf);
2284 case 0xb0:
2285 return ata_scsiop_inq_b0(dev, cmd, rbuf);
2286 case 0xb1:
2287 return ata_scsiop_inq_b1(dev, cmd, rbuf);
2288 case 0xb2:
2289 return ata_scsiop_inq_b2(dev, cmd, rbuf);
2290 case 0xb6:
2291 return ata_scsiop_inq_b6(dev, cmd, rbuf);
2292 case 0xb9:
2293 return ata_scsiop_inq_b9(dev, cmd, rbuf);
2294 default:
2295 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
2296 return 0;
2297 }
2298}
2299
2300/**
2301 * modecpy - Prepare response for MODE SENSE
2302 * @dest: output buffer
2303 * @src: data being copied
2304 * @n: length of mode page
2305 * @changeable: whether changeable parameters are requested
2306 *
2307 * Generate a generic MODE SENSE page for either current or changeable
2308 * parameters.
2309 *
2310 * LOCKING:
2311 * None.
2312 */
2313static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2314{
2315 if (changeable) {
2316 memcpy(dest, src, 2);
2317 memset(dest + 2, 0, n - 2);
2318 } else {
2319 memcpy(dest, src, n);
2320 }
2321}
2322
2323/**
2324 * ata_msense_caching - Simulate MODE SENSE caching info page
2325 * @id: device IDENTIFY data
2326 * @buf: output buffer
2327 * @changeable: whether changeable parameters are requested
2328 *
2329 * Generate a caching info page, which conditionally indicates
2330 * write caching to the SCSI layer, depending on device
2331 * capabilities.
2332 *
2333 * LOCKING:
2334 * None.
2335 */
2336static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2337{
2338 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2339 if (changeable) {
2340 buf[2] |= (1 << 2); /* ata_mselect_caching() */
2341 } else {
2342 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */
2343 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */
2344 }
2345 return sizeof(def_cache_mpage);
2346}
2347
2348/*
2349 * Simulate MODE SENSE control mode page, sub-page 0.
2350 */
2351static unsigned int ata_msense_control_spg0(struct ata_device *dev, u8 *buf,
2352 bool changeable)
2353{
2354 modecpy(buf, def_control_mpage,
2355 sizeof(def_control_mpage), changeable);
2356 if (changeable) {
2357 /* ata_mselect_control() */
2358 buf[2] |= (1 << 2);
2359 } else {
2360 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
2361
2362 /* descriptor format sense data */
2363 buf[2] |= (d_sense << 2);
2364 }
2365
2366 return sizeof(def_control_mpage);
2367}
2368
2369/*
2370 * Translate an ATA duration limit in microseconds to a SCSI duration limit
2371 * using the t2cdlunits 0xa (10ms). Since the SCSI duration limits are 2-bytes
2372 * only, take care of overflows.
2373 */
2374static inline u16 ata_xlat_cdl_limit(u8 *buf)
2375{
2376 u32 limit = get_unaligned_le32(buf);
2377
2378 return min_t(u32, limit / 10000, 65535);
2379}
2380
2381/*
2382 * Simulate MODE SENSE control mode page, sub-pages 07h and 08h
2383 * (command duration limits T2A and T2B mode pages).
2384 */
2385static unsigned int ata_msense_control_spgt2(struct ata_device *dev, u8 *buf,
2386 u8 spg)
2387{
2388 u8 *b, *cdl, *desc;
2389 u32 policy;
2390 int i;
2391
2392 if (!(dev->flags & ATA_DFLAG_CDL) || !dev->cdl)
2393 return 0;
2394
2395 cdl = dev->cdl->desc_log_buf;
2396
2397 /*
2398 * Fill the subpage. The first four bytes of the T2A/T2B mode pages
2399 * are a header. The PAGE LENGTH field is the size of the page
2400 * excluding the header.
2401 */
2402 buf[0] = CONTROL_MPAGE;
2403 buf[1] = spg;
2404 put_unaligned_be16(CDL_T2_SUB_MPAGE_LEN - 4, &buf[2]);
2405 if (spg == CDL_T2A_SUB_MPAGE) {
2406 /*
2407 * Read descriptors map to the T2A page:
2408 * set perf_vs_duration_guidleine.
2409 */
2410 buf[7] = (cdl[0] & 0x03) << 4;
2411 desc = cdl + 64;
2412 } else {
2413 /* Write descriptors map to the T2B page */
2414 desc = cdl + 288;
2415 }
2416
2417 /* Fill the T2 page descriptors */
2418 b = &buf[8];
2419 policy = get_unaligned_le32(&cdl[0]);
2420 for (i = 0; i < 7; i++, b += 32, desc += 32) {
2421 /* t2cdlunits: fixed to 10ms */
2422 b[0] = 0x0a;
2423
2424 /* Max inactive time and its policy */
2425 put_unaligned_be16(ata_xlat_cdl_limit(&desc[8]), &b[2]);
2426 b[6] = ((policy >> 8) & 0x0f) << 4;
2427
2428 /* Max active time and its policy */
2429 put_unaligned_be16(ata_xlat_cdl_limit(&desc[4]), &b[4]);
2430 b[6] |= (policy >> 4) & 0x0f;
2431
2432 /* Command duration guideline and its policy */
2433 put_unaligned_be16(ata_xlat_cdl_limit(&desc[16]), &b[10]);
2434 b[14] = policy & 0x0f;
2435 }
2436
2437 return CDL_T2_SUB_MPAGE_LEN;
2438}
2439
2440/*
2441 * Simulate MODE SENSE control mode page, sub-page f2h
2442 * (ATA feature control mode page).
2443 */
2444static unsigned int ata_msense_control_ata_feature(struct ata_device *dev,
2445 u8 *buf)
2446{
2447 /* PS=0, SPF=1 */
2448 buf[0] = CONTROL_MPAGE | (1 << 6);
2449 buf[1] = ATA_FEATURE_SUB_MPAGE;
2450
2451 /*
2452 * The first four bytes of ATA Feature Control mode page are a header.
2453 * The PAGE LENGTH field is the size of the page excluding the header.
2454 */
2455 put_unaligned_be16(ATA_FEATURE_SUB_MPAGE_LEN - 4, &buf[2]);
2456
2457 if (dev->flags & ATA_DFLAG_CDL)
2458 buf[4] = 0x02; /* Support T2A and T2B pages */
2459 else
2460 buf[4] = 0;
2461
2462 return ATA_FEATURE_SUB_MPAGE_LEN;
2463}
2464
2465/**
2466 * ata_msense_control - Simulate MODE SENSE control mode page
2467 * @dev: ATA device of interest
2468 * @buf: output buffer
2469 * @spg: sub-page code
2470 * @changeable: whether changeable parameters are requested
2471 *
2472 * Generate a generic MODE SENSE control mode page.
2473 *
2474 * LOCKING:
2475 * None.
2476 */
2477static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf,
2478 u8 spg, bool changeable)
2479{
2480 unsigned int n;
2481
2482 switch (spg) {
2483 case 0:
2484 return ata_msense_control_spg0(dev, buf, changeable);
2485 case CDL_T2A_SUB_MPAGE:
2486 case CDL_T2B_SUB_MPAGE:
2487 return ata_msense_control_spgt2(dev, buf, spg);
2488 case ATA_FEATURE_SUB_MPAGE:
2489 return ata_msense_control_ata_feature(dev, buf);
2490 case ALL_SUB_MPAGES:
2491 n = ata_msense_control_spg0(dev, buf, changeable);
2492 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2A_SUB_MPAGE);
2493 n += ata_msense_control_spgt2(dev, buf + n, CDL_T2B_SUB_MPAGE);
2494 n += ata_msense_control_ata_feature(dev, buf + n);
2495 return n;
2496 default:
2497 return 0;
2498 }
2499}
2500
2501/**
2502 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2503 * @buf: output buffer
2504 * @changeable: whether changeable parameters are requested
2505 *
2506 * Generate a generic MODE SENSE r/w error recovery page.
2507 *
2508 * LOCKING:
2509 * None.
2510 */
2511static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2512{
2513 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2514 changeable);
2515 return sizeof(def_rw_recovery_mpage);
2516}
2517
2518/**
2519 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2520 * @dev: Target device.
2521 * @cmd: SCSI command of interest.
2522 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2523 *
2524 * Simulate MODE SENSE commands. Assume this is invoked for direct
2525 * access devices (e.g. disks) only. There should be no block
2526 * descriptor for other device types.
2527 *
2528 * LOCKING:
2529 * spin_lock_irqsave(host lock)
2530 */
2531static unsigned int ata_scsiop_mode_sense(struct ata_device *dev,
2532 struct scsi_cmnd *cmd, u8 *rbuf)
2533{
2534 u8 *scsicmd = cmd->cmnd, *p = rbuf;
2535 static const u8 sat_blk_desc[] = {
2536 0, 0, 0, 0, /* number of blocks: sat unspecified */
2537 0,
2538 0, 0x2, 0x0 /* block length: 512 bytes */
2539 };
2540 u8 pg, spg;
2541 unsigned int ebd, page_control, six_byte;
2542 u8 dpofua = 0, bp = 0xff;
2543 u16 fp;
2544
2545 six_byte = (scsicmd[0] == MODE_SENSE);
2546 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2547 /*
2548 * LLBA bit in msense(10) ignored (compliant)
2549 */
2550
2551 page_control = scsicmd[2] >> 6;
2552 switch (page_control) {
2553 case 0: /* current */
2554 case 1: /* changeable */
2555 case 2: /* defaults */
2556 break; /* supported */
2557 case 3: /* saved */
2558 goto saving_not_supp;
2559 default:
2560 fp = 2;
2561 bp = 6;
2562 goto invalid_fld;
2563 }
2564
2565 if (six_byte)
2566 p += 4 + (ebd ? 8 : 0);
2567 else
2568 p += 8 + (ebd ? 8 : 0);
2569
2570 pg = scsicmd[2] & 0x3f;
2571 spg = scsicmd[3];
2572
2573 /*
2574 * Supported subpages: all subpages and sub-pages 07h, 08h and f2h of
2575 * the control page.
2576 */
2577 if (spg) {
2578 switch (spg) {
2579 case ALL_SUB_MPAGES:
2580 break;
2581 case CDL_T2A_SUB_MPAGE:
2582 case CDL_T2B_SUB_MPAGE:
2583 case ATA_FEATURE_SUB_MPAGE:
2584 if (dev->flags & ATA_DFLAG_CDL && pg == CONTROL_MPAGE)
2585 break;
2586 fallthrough;
2587 default:
2588 fp = 3;
2589 goto invalid_fld;
2590 }
2591 }
2592
2593 switch(pg) {
2594 case RW_RECOVERY_MPAGE:
2595 p += ata_msense_rw_recovery(p, page_control == 1);
2596 break;
2597
2598 case CACHE_MPAGE:
2599 p += ata_msense_caching(dev->id, p, page_control == 1);
2600 break;
2601
2602 case CONTROL_MPAGE:
2603 p += ata_msense_control(dev, p, spg, page_control == 1);
2604 break;
2605
2606 case ALL_MPAGES:
2607 p += ata_msense_rw_recovery(p, page_control == 1);
2608 p += ata_msense_caching(dev->id, p, page_control == 1);
2609 p += ata_msense_control(dev, p, spg, page_control == 1);
2610 break;
2611
2612 default: /* invalid page code */
2613 fp = 2;
2614 goto invalid_fld;
2615 }
2616
2617 if (dev->flags & ATA_DFLAG_FUA)
2618 dpofua = 1 << 4;
2619
2620 if (six_byte) {
2621 rbuf[0] = p - rbuf - 1;
2622 rbuf[2] |= dpofua;
2623 if (ebd) {
2624 rbuf[3] = sizeof(sat_blk_desc);
2625 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2626 }
2627
2628 return rbuf[0] + 1;
2629 }
2630
2631 put_unaligned_be16(p - rbuf - 2, &rbuf[0]);
2632 rbuf[3] |= dpofua;
2633 if (ebd) {
2634 rbuf[7] = sizeof(sat_blk_desc);
2635 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2636 }
2637
2638 return get_unaligned_be16(&rbuf[0]) + 2;
2639
2640invalid_fld:
2641 ata_scsi_set_invalid_field(dev, cmd, fp, bp);
2642 return 0;
2643
2644saving_not_supp:
2645 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2646 /* "Saving parameters not supported" */
2647 return 0;
2648}
2649
2650/**
2651 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2652 * @dev: Target device.
2653 * @cmd: SCSI command of interest.
2654 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2655 *
2656 * Simulate READ CAPACITY commands.
2657 *
2658 * LOCKING:
2659 * None.
2660 */
2661static unsigned int ata_scsiop_read_cap(struct ata_device *dev,
2662 struct scsi_cmnd *cmd, u8 *rbuf)
2663{
2664 u8 *scsicmd = cmd->cmnd;
2665 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2666 u32 sector_size; /* physical sector size in bytes */
2667 u8 log2_per_phys;
2668 u16 lowest_aligned;
2669
2670 sector_size = ata_id_logical_sector_size(dev->id);
2671 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2672 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2673
2674 if (scsicmd[0] == READ_CAPACITY) {
2675 if (last_lba >= 0xffffffffULL)
2676 last_lba = 0xffffffff;
2677
2678 /* sector count, 32-bit */
2679 rbuf[0] = last_lba >> (8 * 3);
2680 rbuf[1] = last_lba >> (8 * 2);
2681 rbuf[2] = last_lba >> (8 * 1);
2682 rbuf[3] = last_lba;
2683
2684 /* sector size */
2685 rbuf[4] = sector_size >> (8 * 3);
2686 rbuf[5] = sector_size >> (8 * 2);
2687 rbuf[6] = sector_size >> (8 * 1);
2688 rbuf[7] = sector_size;
2689
2690 return 8;
2691 }
2692
2693 /*
2694 * READ CAPACITY 16 command is defined as a service action
2695 * (SERVICE_ACTION_IN_16 command).
2696 */
2697 if (scsicmd[0] != SERVICE_ACTION_IN_16 ||
2698 (scsicmd[1] & 0x1f) != SAI_READ_CAPACITY_16) {
2699 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
2700 return 0;
2701 }
2702
2703 /* sector count, 64-bit */
2704 rbuf[0] = last_lba >> (8 * 7);
2705 rbuf[1] = last_lba >> (8 * 6);
2706 rbuf[2] = last_lba >> (8 * 5);
2707 rbuf[3] = last_lba >> (8 * 4);
2708 rbuf[4] = last_lba >> (8 * 3);
2709 rbuf[5] = last_lba >> (8 * 2);
2710 rbuf[6] = last_lba >> (8 * 1);
2711 rbuf[7] = last_lba;
2712
2713 /* sector size */
2714 rbuf[ 8] = sector_size >> (8 * 3);
2715 rbuf[ 9] = sector_size >> (8 * 2);
2716 rbuf[10] = sector_size >> (8 * 1);
2717 rbuf[11] = sector_size;
2718
2719 if (ata_id_zoned_cap(dev->id) || dev->class == ATA_DEV_ZAC)
2720 rbuf[12] = (1 << 4); /* RC_BASIS */
2721 rbuf[13] = log2_per_phys;
2722 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2723 rbuf[15] = lowest_aligned;
2724
2725 if (ata_id_has_trim(dev->id) && !(dev->quirks & ATA_QUIRK_NOTRIM)) {
2726 rbuf[14] |= 0x80; /* LBPME */
2727
2728 if (ata_id_has_zero_after_trim(dev->id) &&
2729 dev->quirks & ATA_QUIRK_ZERO_AFTER_TRIM) {
2730 ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2731 rbuf[14] |= 0x40; /* LBPRZ */
2732 }
2733 }
2734
2735 return 16;
2736}
2737
2738/**
2739 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2740 * @dev: Target device.
2741 * @cmd: SCSI command of interest.
2742 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2743 *
2744 * Simulate REPORT LUNS command.
2745 *
2746 * LOCKING:
2747 * spin_lock_irqsave(host lock)
2748 */
2749static unsigned int ata_scsiop_report_luns(struct ata_device *dev,
2750 struct scsi_cmnd *cmd, u8 *rbuf)
2751{
2752 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2753
2754 return 16;
2755}
2756
2757/*
2758 * ATAPI devices typically report zero for their SCSI version, and sometimes
2759 * deviate from the spec WRT response data format. If SCSI version is
2760 * reported as zero like normal, then we make the following fixups:
2761 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a
2762 * modern device.
2763 * 2) Ensure response data format / ATAPI information are always correct.
2764 */
2765static void atapi_fixup_inquiry(struct scsi_cmnd *cmd)
2766{
2767 u8 buf[4];
2768
2769 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
2770 if (buf[2] == 0) {
2771 buf[2] = 0x5;
2772 buf[3] = 0x32;
2773 }
2774 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
2775}
2776
2777static void atapi_qc_complete(struct ata_queued_cmd *qc)
2778{
2779 struct scsi_cmnd *cmd = qc->scsicmd;
2780 unsigned int err_mask = qc->err_mask;
2781
2782 /* handle completion from EH */
2783 if (unlikely(err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2784
2785 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID))
2786 ata_gen_passthru_sense(qc);
2787
2788 /* SCSI EH automatically locks door if sdev->locked is
2789 * set. Sometimes door lock request continues to
2790 * fail, for example, when no media is present. This
2791 * creates a loop - SCSI EH issues door lock which
2792 * fails and gets invoked again to acquire sense data
2793 * for the failed command.
2794 *
2795 * If door lock fails, always clear sdev->locked to
2796 * avoid this infinite loop.
2797 *
2798 * This may happen before SCSI scan is complete. Make
2799 * sure qc->dev->sdev isn't NULL before dereferencing.
2800 */
2801 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2802 qc->dev->sdev->locked = 0;
2803
2804 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2805 ata_qc_done(qc);
2806 return;
2807 }
2808
2809 /* successful completion path */
2810 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0)
2811 atapi_fixup_inquiry(cmd);
2812 cmd->result = SAM_STAT_GOOD;
2813
2814 ata_qc_done(qc);
2815}
2816/**
2817 * atapi_xlat - Initialize PACKET taskfile
2818 * @qc: command structure to be initialized
2819 *
2820 * LOCKING:
2821 * spin_lock_irqsave(host lock)
2822 *
2823 * RETURNS:
2824 * Zero on success, non-zero on failure.
2825 */
2826static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2827{
2828 struct scsi_cmnd *scmd = qc->scsicmd;
2829 struct ata_device *dev = qc->dev;
2830 int nodata = (scmd->sc_data_direction == DMA_NONE);
2831 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2832 unsigned int nbytes;
2833
2834 memset(qc->cdb, 0, dev->cdb_len);
2835 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2836
2837 qc->complete_fn = atapi_qc_complete;
2838
2839 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2840 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2841 qc->tf.flags |= ATA_TFLAG_WRITE;
2842 }
2843
2844 qc->tf.command = ATA_CMD_PACKET;
2845 ata_qc_set_pc_nbytes(qc);
2846
2847 /* check whether ATAPI DMA is safe */
2848 if (!nodata && !using_pio && atapi_check_dma(qc))
2849 using_pio = 1;
2850
2851 /* Some controller variants snoop this value for Packet
2852 * transfers to do state machine and FIFO management. Thus we
2853 * want to set it properly, and for DMA where it is
2854 * effectively meaningless.
2855 */
2856 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2857
2858 /* Most ATAPI devices which honor transfer chunk size don't
2859 * behave according to the spec when odd chunk size which
2860 * matches the transfer length is specified. If the number of
2861 * bytes to transfer is 2n+1. According to the spec, what
2862 * should happen is to indicate that 2n+1 is going to be
2863 * transferred and transfer 2n+2 bytes where the last byte is
2864 * padding.
2865 *
2866 * In practice, this doesn't happen. ATAPI devices first
2867 * indicate and transfer 2n bytes and then indicate and
2868 * transfer 2 bytes where the last byte is padding.
2869 *
2870 * This inconsistency confuses several controllers which
2871 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2872 * These controllers use actual number of transferred bytes to
2873 * update DMA pointer and transfer of 4n+2 bytes make those
2874 * controller push DMA pointer by 4n+4 bytes because SATA data
2875 * FISes are aligned to 4 bytes. This causes data corruption
2876 * and buffer overrun.
2877 *
2878 * Always setting nbytes to even number solves this problem
2879 * because then ATAPI devices don't have to split data at 2n
2880 * boundaries.
2881 */
2882 if (nbytes & 0x1)
2883 nbytes++;
2884
2885 qc->tf.lbam = (nbytes & 0xFF);
2886 qc->tf.lbah = (nbytes >> 8);
2887
2888 if (nodata)
2889 qc->tf.protocol = ATAPI_PROT_NODATA;
2890 else if (using_pio)
2891 qc->tf.protocol = ATAPI_PROT_PIO;
2892 else {
2893 /* DMA data xfer */
2894 qc->tf.protocol = ATAPI_PROT_DMA;
2895 qc->tf.feature |= ATAPI_PKT_DMA;
2896
2897 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2898 (scmd->sc_data_direction != DMA_TO_DEVICE))
2899 /* some SATA bridges need us to indicate data xfer direction */
2900 qc->tf.feature |= ATAPI_DMADIR;
2901 }
2902
2903
2904 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2905 as ATAPI tape drives don't get this right otherwise */
2906 return 0;
2907}
2908
2909static struct ata_device *ata_find_dev(struct ata_port *ap, unsigned int devno)
2910{
2911 /*
2912 * For the non-PMP case, ata_link_max_devices() returns 1 (SATA case),
2913 * or 2 (IDE master + slave case). However, the former case includes
2914 * libsas hosted devices which are numbered per scsi host, leading
2915 * to devno potentially being larger than 0 but with each struct
2916 * ata_device having its own struct ata_port and struct ata_link.
2917 * To accommodate these, ignore devno and always use device number 0.
2918 */
2919 if (likely(!sata_pmp_attached(ap))) {
2920 int link_max_devices = ata_link_max_devices(&ap->link);
2921
2922 if (link_max_devices == 1)
2923 return &ap->link.device[0];
2924
2925 if (devno < link_max_devices)
2926 return &ap->link.device[devno];
2927
2928 return NULL;
2929 }
2930
2931 /*
2932 * For PMP-attached devices, the device number corresponds to C
2933 * (channel) of SCSI [H:C:I:L], indicating the port pmp link
2934 * for the device.
2935 */
2936 if (devno < ap->nr_pmp_links)
2937 return &ap->pmp_link[devno].device[0];
2938
2939 return NULL;
2940}
2941
2942static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2943 const struct scsi_device *scsidev)
2944{
2945 int devno;
2946
2947 /* skip commands not addressed to targets we simulate */
2948 if (!sata_pmp_attached(ap)) {
2949 if (unlikely(scsidev->channel || scsidev->lun))
2950 return NULL;
2951 devno = scsidev->id;
2952 } else {
2953 if (unlikely(scsidev->id || scsidev->lun))
2954 return NULL;
2955 devno = scsidev->channel;
2956 }
2957
2958 return ata_find_dev(ap, devno);
2959}
2960
2961/**
2962 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2963 * @ap: ATA port to which the device is attached
2964 * @scsidev: SCSI device from which we derive the ATA device
2965 *
2966 * Given various information provided in struct scsi_cmnd,
2967 * map that onto an ATA bus, and using that mapping
2968 * determine which ata_device is associated with the
2969 * SCSI command to be sent.
2970 *
2971 * LOCKING:
2972 * spin_lock_irqsave(host lock)
2973 *
2974 * RETURNS:
2975 * Associated ATA device, or %NULL if not found.
2976 */
2977struct ata_device *
2978ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2979{
2980 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2981
2982 if (unlikely(!dev || !ata_dev_enabled(dev)))
2983 return NULL;
2984
2985 return dev;
2986}
2987
2988/*
2989 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2990 * @byte1: Byte 1 from pass-thru CDB.
2991 *
2992 * RETURNS:
2993 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2994 */
2995static u8
2996ata_scsi_map_proto(u8 byte1)
2997{
2998 switch((byte1 & 0x1e) >> 1) {
2999 case 3: /* Non-data */
3000 return ATA_PROT_NODATA;
3001
3002 case 6: /* DMA */
3003 case 10: /* UDMA Data-in */
3004 case 11: /* UDMA Data-Out */
3005 return ATA_PROT_DMA;
3006
3007 case 4: /* PIO Data-in */
3008 case 5: /* PIO Data-out */
3009 return ATA_PROT_PIO;
3010
3011 case 12: /* FPDMA */
3012 return ATA_PROT_NCQ;
3013
3014 case 0: /* Hard Reset */
3015 case 1: /* SRST */
3016 case 8: /* Device Diagnostic */
3017 case 9: /* Device Reset */
3018 case 7: /* DMA Queued */
3019 case 15: /* Return Response Info */
3020 default: /* Reserved */
3021 break;
3022 }
3023
3024 return ATA_PROT_UNKNOWN;
3025}
3026
3027/**
3028 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
3029 * @qc: command structure to be initialized
3030 *
3031 * Handles either 12, 16, or 32-byte versions of the CDB.
3032 *
3033 * RETURNS:
3034 * Zero on success, non-zero on failure.
3035 */
3036static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
3037{
3038 struct ata_taskfile *tf = &(qc->tf);
3039 struct scsi_cmnd *scmd = qc->scsicmd;
3040 struct ata_device *dev = qc->dev;
3041 const u8 *cdb = scmd->cmnd;
3042 u16 fp;
3043 u16 cdb_offset = 0;
3044
3045 /* 7Fh variable length cmd means a ata pass-thru(32) */
3046 if (cdb[0] == VARIABLE_LENGTH_CMD)
3047 cdb_offset = 9;
3048
3049 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]);
3050 if (tf->protocol == ATA_PROT_UNKNOWN) {
3051 fp = 1;
3052 goto invalid_fld;
3053 }
3054
3055 if ((cdb[2 + cdb_offset] & 0x3) == 0) {
3056 /*
3057 * When T_LENGTH is zero (No data is transferred), dir should
3058 * be DMA_NONE.
3059 */
3060 if (scmd->sc_data_direction != DMA_NONE) {
3061 fp = 2 + cdb_offset;
3062 goto invalid_fld;
3063 }
3064
3065 if (ata_is_ncq(tf->protocol))
3066 tf->protocol = ATA_PROT_NCQ_NODATA;
3067 }
3068
3069 /* enable LBA */
3070 tf->flags |= ATA_TFLAG_LBA;
3071
3072 /*
3073 * 12 and 16 byte CDBs use different offsets to
3074 * provide the various register values.
3075 */
3076 switch (cdb[0]) {
3077 case ATA_16:
3078 /*
3079 * 16-byte CDB - may contain extended commands.
3080 *
3081 * If that is the case, copy the upper byte register values.
3082 */
3083 if (cdb[1] & 0x01) {
3084 tf->hob_feature = cdb[3];
3085 tf->hob_nsect = cdb[5];
3086 tf->hob_lbal = cdb[7];
3087 tf->hob_lbam = cdb[9];
3088 tf->hob_lbah = cdb[11];
3089 tf->flags |= ATA_TFLAG_LBA48;
3090 } else
3091 tf->flags &= ~ATA_TFLAG_LBA48;
3092
3093 /*
3094 * Always copy low byte, device and command registers.
3095 */
3096 tf->feature = cdb[4];
3097 tf->nsect = cdb[6];
3098 tf->lbal = cdb[8];
3099 tf->lbam = cdb[10];
3100 tf->lbah = cdb[12];
3101 tf->device = cdb[13];
3102 tf->command = cdb[14];
3103 break;
3104 case ATA_12:
3105 /*
3106 * 12-byte CDB - incapable of extended commands.
3107 */
3108 tf->flags &= ~ATA_TFLAG_LBA48;
3109
3110 tf->feature = cdb[3];
3111 tf->nsect = cdb[4];
3112 tf->lbal = cdb[5];
3113 tf->lbam = cdb[6];
3114 tf->lbah = cdb[7];
3115 tf->device = cdb[8];
3116 tf->command = cdb[9];
3117 break;
3118 default:
3119 /*
3120 * 32-byte CDB - may contain extended command fields.
3121 *
3122 * If that is the case, copy the upper byte register values.
3123 */
3124 if (cdb[10] & 0x01) {
3125 tf->hob_feature = cdb[20];
3126 tf->hob_nsect = cdb[22];
3127 tf->hob_lbal = cdb[16];
3128 tf->hob_lbam = cdb[15];
3129 tf->hob_lbah = cdb[14];
3130 tf->flags |= ATA_TFLAG_LBA48;
3131 } else
3132 tf->flags &= ~ATA_TFLAG_LBA48;
3133
3134 tf->feature = cdb[21];
3135 tf->nsect = cdb[23];
3136 tf->lbal = cdb[19];
3137 tf->lbam = cdb[18];
3138 tf->lbah = cdb[17];
3139 tf->device = cdb[24];
3140 tf->command = cdb[25];
3141 tf->auxiliary = get_unaligned_be32(&cdb[28]);
3142 break;
3143 }
3144
3145 /* For NCQ commands copy the tag value */
3146 if (ata_is_ncq(tf->protocol))
3147 tf->nsect = qc->hw_tag << 3;
3148
3149 /* enforce correct master/slave bit */
3150 tf->device = dev->devno ?
3151 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
3152
3153 switch (tf->command) {
3154 /* READ/WRITE LONG use a non-standard sect_size */
3155 case ATA_CMD_READ_LONG:
3156 case ATA_CMD_READ_LONG_ONCE:
3157 case ATA_CMD_WRITE_LONG:
3158 case ATA_CMD_WRITE_LONG_ONCE:
3159 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) {
3160 fp = 1;
3161 goto invalid_fld;
3162 }
3163 qc->sect_size = scsi_bufflen(scmd);
3164 break;
3165
3166 /* commands using reported Logical Block size (e.g. 512 or 4K) */
3167 case ATA_CMD_CFA_WRITE_NE:
3168 case ATA_CMD_CFA_TRANS_SECT:
3169 case ATA_CMD_CFA_WRITE_MULT_NE:
3170 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
3171 case ATA_CMD_READ:
3172 case ATA_CMD_READ_EXT:
3173 case ATA_CMD_READ_QUEUED:
3174 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
3175 case ATA_CMD_FPDMA_READ:
3176 case ATA_CMD_READ_MULTI:
3177 case ATA_CMD_READ_MULTI_EXT:
3178 case ATA_CMD_PIO_READ:
3179 case ATA_CMD_PIO_READ_EXT:
3180 case ATA_CMD_READ_STREAM_DMA_EXT:
3181 case ATA_CMD_READ_STREAM_EXT:
3182 case ATA_CMD_VERIFY:
3183 case ATA_CMD_VERIFY_EXT:
3184 case ATA_CMD_WRITE:
3185 case ATA_CMD_WRITE_EXT:
3186 case ATA_CMD_WRITE_FUA_EXT:
3187 case ATA_CMD_WRITE_QUEUED:
3188 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
3189 case ATA_CMD_FPDMA_WRITE:
3190 case ATA_CMD_WRITE_MULTI:
3191 case ATA_CMD_WRITE_MULTI_EXT:
3192 case ATA_CMD_WRITE_MULTI_FUA_EXT:
3193 case ATA_CMD_PIO_WRITE:
3194 case ATA_CMD_PIO_WRITE_EXT:
3195 case ATA_CMD_WRITE_STREAM_DMA_EXT:
3196 case ATA_CMD_WRITE_STREAM_EXT:
3197 qc->sect_size = scmd->device->sector_size;
3198 break;
3199
3200 /* Everything else uses 512 byte "sectors" */
3201 default:
3202 qc->sect_size = ATA_SECT_SIZE;
3203 }
3204
3205 /*
3206 * Set flags so that all registers will be written, pass on
3207 * write indication (used for PIO/DMA setup), result TF is
3208 * copied back and we don't whine too much about its failure.
3209 */
3210 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3211 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3212 tf->flags |= ATA_TFLAG_WRITE;
3213
3214 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3215
3216 /*
3217 * Set transfer length.
3218 *
3219 * TODO: find out if we need to do more here to
3220 * cover scatter/gather case.
3221 */
3222 ata_qc_set_pc_nbytes(qc);
3223
3224 /* We may not issue DMA commands if no DMA mode is set */
3225 if (tf->protocol == ATA_PROT_DMA && !ata_dma_enabled(dev)) {
3226 fp = 1;
3227 goto invalid_fld;
3228 }
3229
3230 /* We may not issue NCQ commands to devices not supporting NCQ */
3231 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) {
3232 fp = 1;
3233 goto invalid_fld;
3234 }
3235
3236 /* sanity check for pio multi commands */
3237 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) {
3238 fp = 1;
3239 goto invalid_fld;
3240 }
3241
3242 if (is_multi_taskfile(tf)) {
3243 unsigned int multi_count = 1 << (cdb[1] >> 5);
3244
3245 /* compare the passed through multi_count
3246 * with the cached multi_count of libata
3247 */
3248 if (multi_count != dev->multi_count)
3249 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3250 multi_count);
3251 }
3252
3253 /*
3254 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3255 * SET_FEATURES - XFER MODE must be preceded/succeeded
3256 * by an update to hardware-specific registers for each
3257 * controller (i.e. the reason for ->set_piomode(),
3258 * ->set_dmamode(), and ->post_set_mode() hooks).
3259 */
3260 if (tf->command == ATA_CMD_SET_FEATURES &&
3261 tf->feature == SETFEATURES_XFER) {
3262 fp = (cdb[0] == ATA_16) ? 4 : 3;
3263 goto invalid_fld;
3264 }
3265
3266 /*
3267 * Filter TPM commands by default. These provide an
3268 * essentially uncontrolled encrypted "back door" between
3269 * applications and the disk. Set libata.allow_tpm=1 if you
3270 * have a real reason for wanting to use them. This ensures
3271 * that installed software cannot easily mess stuff up without
3272 * user intent. DVR type users will probably ship with this enabled
3273 * for movie content management.
3274 *
3275 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3276 * for this and should do in future but that it is not sufficient as
3277 * DCS is an optional feature set. Thus we also do the software filter
3278 * so that we comply with the TC consortium stated goal that the user
3279 * can turn off TC features of their system.
3280 */
3281 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) {
3282 fp = (cdb[0] == ATA_16) ? 14 : 9;
3283 goto invalid_fld;
3284 }
3285
3286 return 0;
3287
3288 invalid_fld:
3289 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff);
3290 return 1;
3291}
3292
3293/**
3294 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim
3295 * @cmd: SCSI command being translated
3296 * @trmax: Maximum number of entries that will fit in sector_size bytes.
3297 * @sector: Starting sector
3298 * @count: Total Range of request in logical sectors
3299 *
3300 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted
3301 * descriptor.
3302 *
3303 * Upto 64 entries of the format:
3304 * 63:48 Range Length
3305 * 47:0 LBA
3306 *
3307 * Range Length of 0 is ignored.
3308 * LBA's should be sorted order and not overlap.
3309 *
3310 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET
3311 *
3312 * Return: Number of bytes copied into sglist.
3313 */
3314static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax,
3315 u64 sector, u32 count)
3316{
3317 struct scsi_device *sdp = cmd->device;
3318 size_t len = sdp->sector_size;
3319 size_t r;
3320 __le64 *buf;
3321 u32 i = 0;
3322 unsigned long flags;
3323
3324 WARN_ON(len > ATA_SCSI_RBUF_SIZE);
3325
3326 if (len > ATA_SCSI_RBUF_SIZE)
3327 len = ATA_SCSI_RBUF_SIZE;
3328
3329 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
3330 buf = ((void *)ata_scsi_rbuf);
3331 memset(buf, 0, len);
3332 while (i < trmax) {
3333 u64 entry = sector |
3334 ((u64)(count > 0xffff ? 0xffff : count) << 48);
3335 buf[i++] = __cpu_to_le64(entry);
3336 if (count <= 0xffff)
3337 break;
3338 count -= 0xffff;
3339 sector += 0xffff;
3340 }
3341 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len);
3342 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
3343
3344 return r;
3345}
3346
3347/**
3348 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same
3349 * @qc: Command to be translated
3350 *
3351 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or
3352 * an SCT Write Same command.
3353 * Based on WRITE SAME has the UNMAP flag:
3354 *
3355 * - When set translate to DSM TRIM
3356 * - When clear translate to SCT Write Same
3357 */
3358static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3359{
3360 struct ata_taskfile *tf = &qc->tf;
3361 struct scsi_cmnd *scmd = qc->scsicmd;
3362 struct scsi_device *sdp = scmd->device;
3363 size_t len = sdp->sector_size;
3364 struct ata_device *dev = qc->dev;
3365 const u8 *cdb = scmd->cmnd;
3366 u64 block;
3367 u32 n_block;
3368 const u32 trmax = len >> 3;
3369 u32 size;
3370 u16 fp;
3371 u8 bp = 0xff;
3372 u8 unmap = cdb[1] & 0x8;
3373
3374 /* we may not issue DMA commands if no DMA mode is set */
3375 if (unlikely(!ata_dma_enabled(dev)))
3376 goto invalid_opcode;
3377
3378 /*
3379 * We only allow sending this command through the block layer,
3380 * as it modifies the DATA OUT buffer, which would corrupt user
3381 * memory for SG_IO commands.
3382 */
3383 if (unlikely(blk_rq_is_passthrough(scsi_cmd_to_rq(scmd))))
3384 goto invalid_opcode;
3385
3386 if (unlikely(scmd->cmd_len < 16)) {
3387 fp = 15;
3388 goto invalid_fld;
3389 }
3390 scsi_16_lba_len(cdb, &block, &n_block);
3391
3392 if (!unmap || (dev->quirks & ATA_QUIRK_NOTRIM) ||
3393 !ata_id_has_trim(dev->id)) {
3394 fp = 1;
3395 bp = 3;
3396 goto invalid_fld;
3397 }
3398 /* If the request is too large the cmd is invalid */
3399 if (n_block > 0xffff * trmax) {
3400 fp = 2;
3401 goto invalid_fld;
3402 }
3403
3404 /*
3405 * WRITE SAME always has a sector sized buffer as payload, this
3406 * should never be a multiple entry S/G list.
3407 */
3408 if (!scsi_sg_count(scmd))
3409 goto invalid_param_len;
3410
3411 /*
3412 * size must match sector size in bytes
3413 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count)
3414 * is defined as number of 512 byte blocks to be transferred.
3415 */
3416
3417 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);
3418 if (size != len)
3419 goto invalid_param_len;
3420
3421 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3422 /* Newer devices support queued TRIM commands */
3423 tf->protocol = ATA_PROT_NCQ;
3424 tf->command = ATA_CMD_FPDMA_SEND;
3425 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3426 tf->nsect = qc->hw_tag << 3;
3427 tf->hob_feature = (size / 512) >> 8;
3428 tf->feature = size / 512;
3429
3430 tf->auxiliary = 1;
3431 } else {
3432 tf->protocol = ATA_PROT_DMA;
3433 tf->hob_feature = 0;
3434 tf->feature = ATA_DSM_TRIM;
3435 tf->hob_nsect = (size / 512) >> 8;
3436 tf->nsect = size / 512;
3437 tf->command = ATA_CMD_DSM;
3438 }
3439
3440 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3441 ATA_TFLAG_WRITE;
3442
3443 ata_qc_set_pc_nbytes(qc);
3444
3445 return 0;
3446
3447invalid_fld:
3448 ata_scsi_set_invalid_field(dev, scmd, fp, bp);
3449 return 1;
3450invalid_param_len:
3451 /* "Parameter list length error" */
3452 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3453 return 1;
3454invalid_opcode:
3455 /* "Invalid command operation code" */
3456 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0);
3457 return 1;
3458}
3459
3460/**
3461 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN
3462 * @dev: Target device.
3463 * @cmd: SCSI command of interest.
3464 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
3465 *
3466 * Yields a subset to satisfy scsi_report_opcode()
3467 *
3468 * LOCKING:
3469 * spin_lock_irqsave(host lock)
3470 */
3471static unsigned int ata_scsiop_maint_in(struct ata_device *dev,
3472 struct scsi_cmnd *cmd, u8 *rbuf)
3473{
3474 u8 *cdb = cmd->cmnd;
3475 u8 supported = 0, cdlp = 0, rwcdlp = 0;
3476
3477 if ((cdb[1] & 0x1f) != MI_REPORT_SUPPORTED_OPERATION_CODES) {
3478 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
3479 return 0;
3480 }
3481
3482 if (cdb[2] != 1 && cdb[2] != 3) {
3483 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]);
3484 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
3485 return 0;
3486 }
3487
3488 switch (cdb[3]) {
3489 case INQUIRY:
3490 case MODE_SENSE:
3491 case MODE_SENSE_10:
3492 case READ_CAPACITY:
3493 case SERVICE_ACTION_IN_16:
3494 case REPORT_LUNS:
3495 case REQUEST_SENSE:
3496 case SYNCHRONIZE_CACHE:
3497 case SYNCHRONIZE_CACHE_16:
3498 case REZERO_UNIT:
3499 case SEEK_6:
3500 case SEEK_10:
3501 case TEST_UNIT_READY:
3502 case SEND_DIAGNOSTIC:
3503 case MAINTENANCE_IN:
3504 case READ_6:
3505 case READ_10:
3506 case WRITE_6:
3507 case WRITE_10:
3508 case ATA_12:
3509 case ATA_16:
3510 case VERIFY:
3511 case VERIFY_16:
3512 case MODE_SELECT:
3513 case MODE_SELECT_10:
3514 case START_STOP:
3515 supported = 3;
3516 break;
3517 case READ_16:
3518 supported = 3;
3519 if (dev->flags & ATA_DFLAG_CDL) {
3520 /*
3521 * CDL read descriptors map to the T2A page, that is,
3522 * rwcdlp = 0x01 and cdlp = 0x01
3523 */
3524 rwcdlp = 0x01;
3525 cdlp = 0x01 << 3;
3526 }
3527 break;
3528 case WRITE_16:
3529 supported = 3;
3530 if (dev->flags & ATA_DFLAG_CDL) {
3531 /*
3532 * CDL write descriptors map to the T2B page, that is,
3533 * rwcdlp = 0x01 and cdlp = 0x02
3534 */
3535 rwcdlp = 0x01;
3536 cdlp = 0x02 << 3;
3537 }
3538 break;
3539 case ZBC_IN:
3540 case ZBC_OUT:
3541 if (ata_id_zoned_cap(dev->id) ||
3542 dev->class == ATA_DEV_ZAC)
3543 supported = 3;
3544 break;
3545 case SECURITY_PROTOCOL_IN:
3546 case SECURITY_PROTOCOL_OUT:
3547 if (dev->flags & ATA_DFLAG_TRUSTED)
3548 supported = 3;
3549 break;
3550 default:
3551 break;
3552 }
3553
3554 /* One command format */
3555 rbuf[0] = rwcdlp;
3556 rbuf[1] = cdlp | supported;
3557
3558 return 4;
3559}
3560
3561/**
3562 * ata_scsi_report_zones_complete - convert ATA output
3563 * @qc: command structure returning the data
3564 *
3565 * Convert T-13 little-endian field representation into
3566 * T-10 big-endian field representation.
3567 * What a mess.
3568 */
3569static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc)
3570{
3571 struct scsi_cmnd *scmd = qc->scsicmd;
3572 struct sg_mapping_iter miter;
3573 unsigned long flags;
3574 unsigned int bytes = 0;
3575
3576 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
3577 SG_MITER_TO_SG | SG_MITER_ATOMIC);
3578
3579 local_irq_save(flags);
3580 while (sg_miter_next(&miter)) {
3581 unsigned int offset = 0;
3582
3583 if (bytes == 0) {
3584 char *hdr;
3585 u32 list_length;
3586 u64 max_lba, opt_lba;
3587 u16 same;
3588
3589 /* Swizzle header */
3590 hdr = miter.addr;
3591 list_length = get_unaligned_le32(&hdr[0]);
3592 same = get_unaligned_le16(&hdr[4]);
3593 max_lba = get_unaligned_le64(&hdr[8]);
3594 opt_lba = get_unaligned_le64(&hdr[16]);
3595 put_unaligned_be32(list_length, &hdr[0]);
3596 hdr[4] = same & 0xf;
3597 put_unaligned_be64(max_lba, &hdr[8]);
3598 put_unaligned_be64(opt_lba, &hdr[16]);
3599 offset += 64;
3600 bytes += 64;
3601 }
3602 while (offset < miter.length) {
3603 char *rec;
3604 u8 cond, type, non_seq, reset;
3605 u64 size, start, wp;
3606
3607 /* Swizzle zone descriptor */
3608 rec = miter.addr + offset;
3609 type = rec[0] & 0xf;
3610 cond = (rec[1] >> 4) & 0xf;
3611 non_seq = (rec[1] & 2);
3612 reset = (rec[1] & 1);
3613 size = get_unaligned_le64(&rec[8]);
3614 start = get_unaligned_le64(&rec[16]);
3615 wp = get_unaligned_le64(&rec[24]);
3616 rec[0] = type;
3617 rec[1] = (cond << 4) | non_seq | reset;
3618 put_unaligned_be64(size, &rec[8]);
3619 put_unaligned_be64(start, &rec[16]);
3620 put_unaligned_be64(wp, &rec[24]);
3621 WARN_ON(offset + 64 > miter.length);
3622 offset += 64;
3623 bytes += 64;
3624 }
3625 }
3626 sg_miter_stop(&miter);
3627 local_irq_restore(flags);
3628
3629 ata_scsi_qc_complete(qc);
3630}
3631
3632static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc)
3633{
3634 struct ata_taskfile *tf = &qc->tf;
3635 struct scsi_cmnd *scmd = qc->scsicmd;
3636 const u8 *cdb = scmd->cmnd;
3637 u16 sect, fp = (u16)-1;
3638 u8 sa, options, bp = 0xff;
3639 u64 block;
3640 u32 n_block;
3641
3642 if (unlikely(scmd->cmd_len < 16)) {
3643 ata_dev_warn(qc->dev, "invalid cdb length %d\n",
3644 scmd->cmd_len);
3645 fp = 15;
3646 goto invalid_fld;
3647 }
3648 scsi_16_lba_len(cdb, &block, &n_block);
3649 if (n_block != scsi_bufflen(scmd)) {
3650 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n",
3651 n_block, scsi_bufflen(scmd));
3652 goto invalid_param_len;
3653 }
3654 sa = cdb[1] & 0x1f;
3655 if (sa != ZI_REPORT_ZONES) {
3656 ata_dev_warn(qc->dev, "invalid service action %d\n", sa);
3657 fp = 1;
3658 goto invalid_fld;
3659 }
3660 /*
3661 * ZAC allows only for transfers in 512 byte blocks,
3662 * and uses a 16 bit value for the transfer count.
3663 */
3664 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) {
3665 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block);
3666 goto invalid_param_len;
3667 }
3668 sect = n_block / 512;
3669 options = cdb[14] & 0xbf;
3670
3671 if (ata_ncq_enabled(qc->dev) &&
3672 ata_fpdma_zac_mgmt_in_supported(qc->dev)) {
3673 tf->protocol = ATA_PROT_NCQ;
3674 tf->command = ATA_CMD_FPDMA_RECV;
3675 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f;
3676 tf->nsect = qc->hw_tag << 3;
3677 tf->feature = sect & 0xff;
3678 tf->hob_feature = (sect >> 8) & 0xff;
3679 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8);
3680 } else {
3681 tf->command = ATA_CMD_ZAC_MGMT_IN;
3682 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES;
3683 tf->protocol = ATA_PROT_DMA;
3684 tf->hob_feature = options;
3685 tf->hob_nsect = (sect >> 8) & 0xff;
3686 tf->nsect = sect & 0xff;
3687 }
3688 tf->device = ATA_LBA;
3689 tf->lbah = (block >> 16) & 0xff;
3690 tf->lbam = (block >> 8) & 0xff;
3691 tf->lbal = block & 0xff;
3692 tf->hob_lbah = (block >> 40) & 0xff;
3693 tf->hob_lbam = (block >> 32) & 0xff;
3694 tf->hob_lbal = (block >> 24) & 0xff;
3695
3696 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3697 qc->flags |= ATA_QCFLAG_RESULT_TF;
3698
3699 ata_qc_set_pc_nbytes(qc);
3700
3701 qc->complete_fn = ata_scsi_report_zones_complete;
3702
3703 return 0;
3704
3705invalid_fld:
3706 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
3707 return 1;
3708
3709invalid_param_len:
3710 /* "Parameter list length error" */
3711 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3712 return 1;
3713}
3714
3715static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc)
3716{
3717 struct ata_taskfile *tf = &qc->tf;
3718 struct scsi_cmnd *scmd = qc->scsicmd;
3719 struct ata_device *dev = qc->dev;
3720 const u8 *cdb = scmd->cmnd;
3721 u8 all, sa;
3722 u64 block;
3723 u32 n_block;
3724 u16 fp = (u16)-1;
3725
3726 if (unlikely(scmd->cmd_len < 16)) {
3727 fp = 15;
3728 goto invalid_fld;
3729 }
3730
3731 sa = cdb[1] & 0x1f;
3732 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) &&
3733 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) {
3734 fp = 1;
3735 goto invalid_fld;
3736 }
3737
3738 scsi_16_lba_len(cdb, &block, &n_block);
3739 if (n_block) {
3740 /*
3741 * ZAC MANAGEMENT OUT doesn't define any length
3742 */
3743 goto invalid_param_len;
3744 }
3745
3746 all = cdb[14] & 0x1;
3747 if (all) {
3748 /*
3749 * Ignore the block address (zone ID) as defined by ZBC.
3750 */
3751 block = 0;
3752 } else if (block >= dev->n_sectors) {
3753 /*
3754 * Block must be a valid zone ID (a zone start LBA).
3755 */
3756 fp = 2;
3757 goto invalid_fld;
3758 }
3759
3760 if (ata_ncq_enabled(qc->dev) &&
3761 ata_fpdma_zac_mgmt_out_supported(qc->dev)) {
3762 tf->protocol = ATA_PROT_NCQ_NODATA;
3763 tf->command = ATA_CMD_NCQ_NON_DATA;
3764 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT;
3765 tf->nsect = qc->hw_tag << 3;
3766 tf->auxiliary = sa | ((u16)all << 8);
3767 } else {
3768 tf->protocol = ATA_PROT_NODATA;
3769 tf->command = ATA_CMD_ZAC_MGMT_OUT;
3770 tf->feature = sa;
3771 tf->hob_feature = all;
3772 }
3773 tf->lbah = (block >> 16) & 0xff;
3774 tf->lbam = (block >> 8) & 0xff;
3775 tf->lbal = block & 0xff;
3776 tf->hob_lbah = (block >> 40) & 0xff;
3777 tf->hob_lbam = (block >> 32) & 0xff;
3778 tf->hob_lbal = (block >> 24) & 0xff;
3779 tf->device = ATA_LBA;
3780 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3781
3782 return 0;
3783
3784 invalid_fld:
3785 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
3786 return 1;
3787invalid_param_len:
3788 /* "Parameter list length error" */
3789 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3790 return 1;
3791}
3792
3793/**
3794 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3795 * @qc: Storage for translated ATA taskfile
3796 * @buf: input buffer
3797 * @len: number of valid bytes in the input buffer
3798 * @fp: out parameter for the failed field on error
3799 *
3800 * Prepare a taskfile to modify caching information for the device.
3801 *
3802 * LOCKING:
3803 * None.
3804 */
3805static int ata_mselect_caching(struct ata_queued_cmd *qc,
3806 const u8 *buf, int len, u16 *fp)
3807{
3808 struct ata_taskfile *tf = &qc->tf;
3809 struct ata_device *dev = qc->dev;
3810 u8 mpage[CACHE_MPAGE_LEN];
3811 u8 wce;
3812 int i;
3813
3814 /*
3815 * The first two bytes of def_cache_mpage are a header, so offsets
3816 * in mpage are off by 2 compared to buf. Same for len.
3817 */
3818
3819 if (len != CACHE_MPAGE_LEN - 2) {
3820 *fp = min(len, CACHE_MPAGE_LEN - 2);
3821 return -EINVAL;
3822 }
3823
3824 wce = buf[0] & (1 << 2);
3825
3826 /*
3827 * Check that read-only bits are not modified.
3828 */
3829 ata_msense_caching(dev->id, mpage, false);
3830 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) {
3831 if (i == 0)
3832 continue;
3833 if (mpage[i + 2] != buf[i]) {
3834 *fp = i;
3835 return -EINVAL;
3836 }
3837 }
3838
3839 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3840 tf->protocol = ATA_PROT_NODATA;
3841 tf->nsect = 0;
3842 tf->command = ATA_CMD_SET_FEATURES;
3843 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3844 return 0;
3845}
3846
3847/*
3848 * Simulate MODE SELECT control mode page, sub-page 0.
3849 */
3850static int ata_mselect_control_spg0(struct ata_queued_cmd *qc,
3851 const u8 *buf, int len, u16 *fp)
3852{
3853 struct ata_device *dev = qc->dev;
3854 u8 mpage[CONTROL_MPAGE_LEN];
3855 u8 d_sense;
3856 int i;
3857
3858 /*
3859 * The first two bytes of def_control_mpage are a header, so offsets
3860 * in mpage are off by 2 compared to buf. Same for len.
3861 */
3862
3863 if (len != CONTROL_MPAGE_LEN - 2) {
3864 *fp = min(len, CONTROL_MPAGE_LEN - 2);
3865 return -EINVAL;
3866 }
3867
3868 d_sense = buf[0] & (1 << 2);
3869
3870 /*
3871 * Check that read-only bits are not modified.
3872 */
3873 ata_msense_control_spg0(dev, mpage, false);
3874 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) {
3875 if (i == 0)
3876 continue;
3877 if (mpage[2 + i] != buf[i]) {
3878 *fp = i;
3879 return -EINVAL;
3880 }
3881 }
3882 if (d_sense & (1 << 2))
3883 dev->flags |= ATA_DFLAG_D_SENSE;
3884 else
3885 dev->flags &= ~ATA_DFLAG_D_SENSE;
3886 return 0;
3887}
3888
3889/*
3890 * Translate MODE SELECT control mode page, sub-pages f2h (ATA feature mode
3891 * page) into a SET FEATURES command.
3892 */
3893static unsigned int ata_mselect_control_ata_feature(struct ata_queued_cmd *qc,
3894 const u8 *buf, int len,
3895 u16 *fp)
3896{
3897 struct ata_device *dev = qc->dev;
3898 struct ata_taskfile *tf = &qc->tf;
3899 u8 cdl_action;
3900
3901 /*
3902 * The first four bytes of ATA Feature Control mode page are a header,
3903 * so offsets in mpage are off by 4 compared to buf. Same for len.
3904 */
3905 if (len != ATA_FEATURE_SUB_MPAGE_LEN - 4) {
3906 *fp = min(len, ATA_FEATURE_SUB_MPAGE_LEN - 4);
3907 return -EINVAL;
3908 }
3909
3910 /* Check cdl_ctrl */
3911 switch (buf[0] & 0x03) {
3912 case 0:
3913 /* Disable CDL */
3914 cdl_action = 0;
3915 dev->flags &= ~ATA_DFLAG_CDL_ENABLED;
3916 break;
3917 case 0x02:
3918 /* Enable CDL T2A/T2B: NCQ priority must be disabled */
3919 if (dev->flags & ATA_DFLAG_NCQ_PRIO_ENABLED) {
3920 ata_dev_err(dev,
3921 "NCQ priority must be disabled to enable CDL\n");
3922 return -EINVAL;
3923 }
3924 cdl_action = 1;
3925 dev->flags |= ATA_DFLAG_CDL_ENABLED;
3926 break;
3927 default:
3928 *fp = 0;
3929 return -EINVAL;
3930 }
3931
3932 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3933 tf->protocol = ATA_PROT_NODATA;
3934 tf->command = ATA_CMD_SET_FEATURES;
3935 tf->feature = SETFEATURES_CDL;
3936 tf->nsect = cdl_action;
3937
3938 return 1;
3939}
3940
3941/**
3942 * ata_mselect_control - Simulate MODE SELECT for control page
3943 * @qc: Storage for translated ATA taskfile
3944 * @spg: target sub-page of the control page
3945 * @buf: input buffer
3946 * @len: number of valid bytes in the input buffer
3947 * @fp: out parameter for the failed field on error
3948 *
3949 * Prepare a taskfile to modify caching information for the device.
3950 *
3951 * LOCKING:
3952 * None.
3953 */
3954static int ata_mselect_control(struct ata_queued_cmd *qc, u8 spg,
3955 const u8 *buf, int len, u16 *fp)
3956{
3957 switch (spg) {
3958 case 0:
3959 return ata_mselect_control_spg0(qc, buf, len, fp);
3960 case ATA_FEATURE_SUB_MPAGE:
3961 return ata_mselect_control_ata_feature(qc, buf, len, fp);
3962 default:
3963 return -EINVAL;
3964 }
3965}
3966
3967/**
3968 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands
3969 * @qc: Storage for translated ATA taskfile
3970 *
3971 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3972 * Assume this is invoked for direct access devices (e.g. disks) only.
3973 * There should be no block descriptor for other device types.
3974 *
3975 * LOCKING:
3976 * spin_lock_irqsave(host lock)
3977 */
3978static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3979{
3980 struct scsi_cmnd *scmd = qc->scsicmd;
3981 const u8 *cdb = scmd->cmnd;
3982 u8 pg, spg;
3983 unsigned six_byte, pg_len, hdr_len, bd_len;
3984 int len, ret;
3985 u16 fp = (u16)-1;
3986 u8 bp = 0xff;
3987 u8 buffer[64];
3988 const u8 *p = buffer;
3989
3990 six_byte = (cdb[0] == MODE_SELECT);
3991 if (six_byte) {
3992 if (scmd->cmd_len < 5) {
3993 fp = 4;
3994 goto invalid_fld;
3995 }
3996
3997 len = cdb[4];
3998 hdr_len = 4;
3999 } else {
4000 if (scmd->cmd_len < 9) {
4001 fp = 8;
4002 goto invalid_fld;
4003 }
4004
4005 len = get_unaligned_be16(&cdb[7]);
4006 hdr_len = 8;
4007 }
4008
4009 /* We only support PF=1, SP=0. */
4010 if ((cdb[1] & 0x11) != 0x10) {
4011 fp = 1;
4012 bp = (cdb[1] & 0x01) ? 1 : 5;
4013 goto invalid_fld;
4014 }
4015
4016 /* Test early for possible overrun. */
4017 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
4018 goto invalid_param_len;
4019
4020 /* Move past header and block descriptors. */
4021 if (len < hdr_len)
4022 goto invalid_param_len;
4023
4024 if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd),
4025 buffer, sizeof(buffer)))
4026 goto invalid_param_len;
4027
4028 if (six_byte)
4029 bd_len = p[3];
4030 else
4031 bd_len = get_unaligned_be16(&p[6]);
4032
4033 len -= hdr_len;
4034 p += hdr_len;
4035 if (len < bd_len)
4036 goto invalid_param_len;
4037 if (bd_len != 0 && bd_len != 8) {
4038 fp = (six_byte) ? 3 : 6;
4039 fp += bd_len + hdr_len;
4040 goto invalid_param;
4041 }
4042
4043 len -= bd_len;
4044 p += bd_len;
4045 if (len == 0)
4046 goto skip;
4047
4048 /* Parse both possible formats for the mode page headers. */
4049 pg = p[0] & 0x3f;
4050 if (p[0] & 0x40) {
4051 if (len < 4)
4052 goto invalid_param_len;
4053
4054 spg = p[1];
4055 pg_len = get_unaligned_be16(&p[2]);
4056 p += 4;
4057 len -= 4;
4058 } else {
4059 if (len < 2)
4060 goto invalid_param_len;
4061
4062 spg = 0;
4063 pg_len = p[1];
4064 p += 2;
4065 len -= 2;
4066 }
4067
4068 /*
4069 * Supported subpages: all subpages and ATA feature sub-page f2h of
4070 * the control page.
4071 */
4072 if (spg) {
4073 switch (spg) {
4074 case ALL_SUB_MPAGES:
4075 /* All subpages is not supported for the control page */
4076 if (pg == CONTROL_MPAGE) {
4077 fp = (p[0] & 0x40) ? 1 : 0;
4078 fp += hdr_len + bd_len;
4079 goto invalid_param;
4080 }
4081 break;
4082 case ATA_FEATURE_SUB_MPAGE:
4083 if (qc->dev->flags & ATA_DFLAG_CDL &&
4084 pg == CONTROL_MPAGE)
4085 break;
4086 fallthrough;
4087 default:
4088 fp = (p[0] & 0x40) ? 1 : 0;
4089 fp += hdr_len + bd_len;
4090 goto invalid_param;
4091 }
4092 }
4093 if (pg_len > len)
4094 goto invalid_param_len;
4095
4096 switch (pg) {
4097 case CACHE_MPAGE:
4098 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) {
4099 fp += hdr_len + bd_len;
4100 goto invalid_param;
4101 }
4102 break;
4103 case CONTROL_MPAGE:
4104 ret = ata_mselect_control(qc, spg, p, pg_len, &fp);
4105 if (ret < 0) {
4106 fp += hdr_len + bd_len;
4107 goto invalid_param;
4108 }
4109 if (!ret)
4110 goto skip; /* No ATA command to send */
4111 break;
4112 default:
4113 /* Invalid page code */
4114 fp = bd_len + hdr_len;
4115 goto invalid_param;
4116 }
4117
4118 /*
4119 * Only one page has changeable data, so we only support setting one
4120 * page at a time.
4121 */
4122 if (len > pg_len)
4123 goto invalid_param;
4124
4125 return 0;
4126
4127 invalid_fld:
4128 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
4129 return 1;
4130
4131 invalid_param:
4132 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp);
4133 return 1;
4134
4135 invalid_param_len:
4136 /* "Parameter list length error" */
4137 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
4138 return 1;
4139
4140 skip:
4141 scmd->result = SAM_STAT_GOOD;
4142 return 1;
4143}
4144
4145static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma)
4146{
4147 if (len == 0)
4148 return ATA_CMD_TRUSTED_NONDATA;
4149 else if (send)
4150 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND;
4151 else
4152 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV;
4153}
4154
4155static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc)
4156{
4157 struct scsi_cmnd *scmd = qc->scsicmd;
4158 const u8 *cdb = scmd->cmnd;
4159 struct ata_taskfile *tf = &qc->tf;
4160 u8 secp = cdb[1];
4161 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT);
4162 u16 spsp = get_unaligned_be16(&cdb[2]);
4163 u32 len = get_unaligned_be32(&cdb[6]);
4164 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO);
4165
4166 /*
4167 * We don't support the ATA "security" protocol.
4168 */
4169 if (secp == 0xef) {
4170 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0);
4171 return 1;
4172 }
4173
4174 if (cdb[4] & 7) { /* INC_512 */
4175 if (len > 0xffff) {
4176 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
4177 return 1;
4178 }
4179 } else {
4180 if (len > 0x01fffe00) {
4181 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
4182 return 1;
4183 }
4184
4185 /* convert to the sector-based ATA addressing */
4186 len = (len + 511) / 512;
4187 }
4188
4189 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO;
4190 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA;
4191 if (send)
4192 tf->flags |= ATA_TFLAG_WRITE;
4193 tf->command = ata_scsi_trusted_op(len, send, dma);
4194 tf->feature = secp;
4195 tf->lbam = spsp & 0xff;
4196 tf->lbah = spsp >> 8;
4197
4198 if (len) {
4199 tf->nsect = len & 0xff;
4200 tf->lbal = len >> 8;
4201 } else {
4202 if (!send)
4203 tf->lbah = (1 << 7);
4204 }
4205
4206 ata_qc_set_pc_nbytes(qc);
4207 return 0;
4208}
4209
4210/**
4211 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler
4212 * @qc: Command to be translated
4213 *
4214 * Translate a SCSI variable length CDB to specified commands.
4215 * It checks a service action value in CDB to call corresponding handler.
4216 *
4217 * RETURNS:
4218 * Zero on success, non-zero on failure
4219 *
4220 */
4221static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc)
4222{
4223 struct scsi_cmnd *scmd = qc->scsicmd;
4224 const u8 *cdb = scmd->cmnd;
4225 const u16 sa = get_unaligned_be16(&cdb[8]);
4226
4227 /*
4228 * if service action represents a ata pass-thru(32) command,
4229 * then pass it to ata_scsi_pass_thru handler.
4230 */
4231 if (sa == ATA_32)
4232 return ata_scsi_pass_thru(qc);
4233
4234 /* unsupported service action */
4235 return 1;
4236}
4237
4238/**
4239 * ata_get_xlat_func - check if SCSI to ATA translation is possible
4240 * @dev: ATA device
4241 * @cmd: SCSI command opcode to consider
4242 *
4243 * Look up the SCSI command given, and determine whether the
4244 * SCSI command is to be translated or simulated.
4245 *
4246 * RETURNS:
4247 * Pointer to translation function if possible, %NULL if not.
4248 */
4249
4250static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
4251{
4252 switch (cmd) {
4253 case READ_6:
4254 case READ_10:
4255 case READ_16:
4256
4257 case WRITE_6:
4258 case WRITE_10:
4259 case WRITE_16:
4260 return ata_scsi_rw_xlat;
4261
4262 case WRITE_SAME_16:
4263 return ata_scsi_write_same_xlat;
4264
4265 case SYNCHRONIZE_CACHE:
4266 case SYNCHRONIZE_CACHE_16:
4267 if (ata_try_flush_cache(dev))
4268 return ata_scsi_flush_xlat;
4269 break;
4270
4271 case VERIFY:
4272 case VERIFY_16:
4273 return ata_scsi_verify_xlat;
4274
4275 case ATA_12:
4276 case ATA_16:
4277 return ata_scsi_pass_thru;
4278
4279 case VARIABLE_LENGTH_CMD:
4280 return ata_scsi_var_len_cdb_xlat;
4281
4282 case MODE_SELECT:
4283 case MODE_SELECT_10:
4284 return ata_scsi_mode_select_xlat;
4285
4286 case ZBC_IN:
4287 return ata_scsi_zbc_in_xlat;
4288
4289 case ZBC_OUT:
4290 return ata_scsi_zbc_out_xlat;
4291
4292 case SECURITY_PROTOCOL_IN:
4293 case SECURITY_PROTOCOL_OUT:
4294 if (!(dev->flags & ATA_DFLAG_TRUSTED))
4295 break;
4296 return ata_scsi_security_inout_xlat;
4297
4298 case START_STOP:
4299 return ata_scsi_start_stop_xlat;
4300 }
4301
4302 return NULL;
4303}
4304
4305int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
4306{
4307 struct ata_port *ap = dev->link->ap;
4308 u8 scsi_op = scmd->cmnd[0];
4309 ata_xlat_func_t xlat_func;
4310
4311 /*
4312 * scsi_queue_rq() will defer commands if scsi_host_in_recovery().
4313 * However, this check is done without holding the ap->lock (a libata
4314 * specific lock), so we can have received an error irq since then,
4315 * therefore we must check if EH is pending, while holding ap->lock.
4316 */
4317 if (ap->pflags & (ATA_PFLAG_EH_PENDING | ATA_PFLAG_EH_IN_PROGRESS))
4318 return SCSI_MLQUEUE_DEVICE_BUSY;
4319
4320 if (unlikely(!scmd->cmd_len))
4321 goto bad_cdb_len;
4322
4323 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
4324 if (unlikely(scmd->cmd_len > dev->cdb_len))
4325 goto bad_cdb_len;
4326
4327 xlat_func = ata_get_xlat_func(dev, scsi_op);
4328 } else if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
4329 /* relay SCSI command to ATAPI device */
4330 int len = COMMAND_SIZE(scsi_op);
4331
4332 if (unlikely(len > scmd->cmd_len ||
4333 len > dev->cdb_len ||
4334 scmd->cmd_len > ATAPI_CDB_LEN))
4335 goto bad_cdb_len;
4336
4337 xlat_func = atapi_xlat;
4338 } else {
4339 /* ATA_16 passthru, treat as an ATA command */
4340 if (unlikely(scmd->cmd_len > 16))
4341 goto bad_cdb_len;
4342
4343 xlat_func = ata_get_xlat_func(dev, scsi_op);
4344 }
4345
4346 if (xlat_func)
4347 return ata_scsi_translate(dev, scmd, xlat_func);
4348
4349 ata_scsi_simulate(dev, scmd);
4350
4351 return 0;
4352
4353 bad_cdb_len:
4354 scmd->result = DID_ERROR << 16;
4355 scsi_done(scmd);
4356 return 0;
4357}
4358
4359/**
4360 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
4361 * @shost: SCSI host of command to be sent
4362 * @cmd: SCSI command to be sent
4363 *
4364 * In some cases, this function translates SCSI commands into
4365 * ATA taskfiles, and queues the taskfiles to be sent to
4366 * hardware. In other cases, this function simulates a
4367 * SCSI device by evaluating and responding to certain
4368 * SCSI commands. This creates the overall effect of
4369 * ATA and ATAPI devices appearing as SCSI devices.
4370 *
4371 * LOCKING:
4372 * ATA host lock
4373 *
4374 * RETURNS:
4375 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4376 * 0 otherwise.
4377 */
4378int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
4379{
4380 struct ata_port *ap;
4381 struct ata_device *dev;
4382 struct scsi_device *scsidev = cmd->device;
4383 int rc = 0;
4384 unsigned long irq_flags;
4385
4386 ap = ata_shost_to_port(shost);
4387
4388 spin_lock_irqsave(ap->lock, irq_flags);
4389
4390 dev = ata_scsi_find_dev(ap, scsidev);
4391 if (likely(dev))
4392 rc = __ata_scsi_queuecmd(cmd, dev);
4393 else {
4394 cmd->result = (DID_BAD_TARGET << 16);
4395 scsi_done(cmd);
4396 }
4397
4398 spin_unlock_irqrestore(ap->lock, irq_flags);
4399
4400 return rc;
4401}
4402EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4403
4404/**
4405 * ata_scsi_simulate - simulate SCSI command on ATA device
4406 * @dev: the target device
4407 * @cmd: SCSI command being sent to device.
4408 *
4409 * Interprets and directly executes a select list of SCSI commands
4410 * that can be handled internally.
4411 *
4412 * LOCKING:
4413 * spin_lock_irqsave(host lock)
4414 */
4415
4416void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
4417{
4418 const u8 *scsicmd = cmd->cmnd;
4419 u8 tmp8;
4420
4421 switch(scsicmd[0]) {
4422 case INQUIRY:
4423 ata_scsi_rbuf_fill(dev, cmd, ata_scsiop_inquiry);
4424 break;
4425
4426 case MODE_SENSE:
4427 case MODE_SENSE_10:
4428 ata_scsi_rbuf_fill(dev, cmd, ata_scsiop_mode_sense);
4429 break;
4430
4431 case READ_CAPACITY:
4432 case SERVICE_ACTION_IN_16:
4433 ata_scsi_rbuf_fill(dev, cmd, ata_scsiop_read_cap);
4434 break;
4435
4436 case REPORT_LUNS:
4437 ata_scsi_rbuf_fill(dev, cmd, ata_scsiop_report_luns);
4438 break;
4439
4440 case REQUEST_SENSE:
4441 ata_scsi_set_sense(dev, cmd, 0, 0, 0);
4442 break;
4443
4444 /* if we reach this, then writeback caching is disabled,
4445 * turning this into a no-op.
4446 */
4447 case SYNCHRONIZE_CACHE:
4448 case SYNCHRONIZE_CACHE_16:
4449 fallthrough;
4450
4451 /* no-op's, complete with success */
4452 case REZERO_UNIT:
4453 case SEEK_6:
4454 case SEEK_10:
4455 case TEST_UNIT_READY:
4456 break;
4457
4458 case SEND_DIAGNOSTIC:
4459 tmp8 = scsicmd[1] & ~(1 << 3);
4460 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4])
4461 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
4462 break;
4463
4464 case MAINTENANCE_IN:
4465 ata_scsi_rbuf_fill(dev, cmd, ata_scsiop_maint_in);
4466 break;
4467
4468 /* all other commands */
4469 default:
4470 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
4471 /* "Invalid command operation code" */
4472 break;
4473 }
4474
4475 scsi_done(cmd);
4476}
4477
4478int ata_scsi_add_hosts(struct ata_host *host, const struct scsi_host_template *sht)
4479{
4480 int i, rc;
4481
4482 for (i = 0; i < host->n_ports; i++) {
4483 struct ata_port *ap = host->ports[i];
4484 struct Scsi_Host *shost;
4485
4486 rc = -ENOMEM;
4487 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
4488 if (!shost)
4489 goto err_alloc;
4490
4491 shost->eh_noresume = 1;
4492 *(struct ata_port **)&shost->hostdata[0] = ap;
4493 ap->scsi_host = shost;
4494
4495 shost->transportt = ata_scsi_transport_template;
4496 shost->unique_id = ap->print_id;
4497 shost->max_id = 16;
4498 shost->max_lun = 1;
4499 shost->max_channel = 1;
4500 shost->max_cmd_len = 32;
4501
4502 /* Schedule policy is determined by ->qc_defer()
4503 * callback and it needs to see every deferred qc.
4504 * Set host_blocked to 1 to prevent SCSI midlayer from
4505 * automatically deferring requests.
4506 */
4507 shost->max_host_blocked = 1;
4508
4509 rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev);
4510 if (rc)
4511 goto err_alloc;
4512 }
4513
4514 return 0;
4515
4516 err_alloc:
4517 while (--i >= 0) {
4518 struct Scsi_Host *shost = host->ports[i]->scsi_host;
4519
4520 /* scsi_host_put() is in ata_devres_release() */
4521 scsi_remove_host(shost);
4522 }
4523 return rc;
4524}
4525
4526#ifdef CONFIG_OF
4527static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
4528{
4529 struct scsi_device *sdev = dev->sdev;
4530 struct device *d = ap->host->dev;
4531 struct device_node *np = d->of_node;
4532 struct device_node *child;
4533
4534 for_each_available_child_of_node(np, child) {
4535 int ret;
4536 u32 val;
4537
4538 ret = of_property_read_u32(child, "reg", &val);
4539 if (ret)
4540 continue;
4541 if (val == dev->devno) {
4542 dev_dbg(d, "found matching device node\n");
4543 sdev->sdev_gendev.of_node = child;
4544 return;
4545 }
4546 }
4547}
4548#else
4549static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
4550{
4551}
4552#endif
4553
4554void ata_scsi_scan_host(struct ata_port *ap, int sync)
4555{
4556 int tries = 5;
4557 struct ata_device *last_failed_dev = NULL;
4558 struct ata_link *link;
4559 struct ata_device *dev;
4560
4561 repeat:
4562 ata_for_each_link(link, ap, EDGE) {
4563 ata_for_each_dev(dev, link, ENABLED) {
4564 struct scsi_device *sdev;
4565 int channel = 0, id = 0;
4566
4567 if (dev->sdev)
4568 continue;
4569
4570 if (ata_is_host_link(link))
4571 id = dev->devno;
4572 else
4573 channel = link->pmp;
4574
4575 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
4576 NULL);
4577 if (!IS_ERR(sdev)) {
4578 dev->sdev = sdev;
4579 ata_scsi_assign_ofnode(dev, ap);
4580 scsi_device_put(sdev);
4581 } else {
4582 dev->sdev = NULL;
4583 }
4584 }
4585 }
4586
4587 /* If we scanned while EH was in progress or allocation
4588 * failure occurred, scan would have failed silently. Check
4589 * whether all devices are attached.
4590 */
4591 ata_for_each_link(link, ap, EDGE) {
4592 ata_for_each_dev(dev, link, ENABLED) {
4593 if (!dev->sdev)
4594 goto exit_loop;
4595 }
4596 }
4597 exit_loop:
4598 if (!link)
4599 return;
4600
4601 /* we're missing some SCSI devices */
4602 if (sync) {
4603 /* If caller requested synchrnous scan && we've made
4604 * any progress, sleep briefly and repeat.
4605 */
4606 if (dev != last_failed_dev) {
4607 msleep(100);
4608 last_failed_dev = dev;
4609 goto repeat;
4610 }
4611
4612 /* We might be failing to detect boot device, give it
4613 * a few more chances.
4614 */
4615 if (--tries) {
4616 msleep(100);
4617 goto repeat;
4618 }
4619
4620 ata_port_err(ap,
4621 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
4622 }
4623
4624 queue_delayed_work(system_long_wq, &ap->hotplug_task,
4625 round_jiffies_relative(HZ));
4626}
4627
4628/**
4629 * ata_scsi_offline_dev - offline attached SCSI device
4630 * @dev: ATA device to offline attached SCSI device for
4631 *
4632 * This function is called from ata_eh_hotplug() and responsible
4633 * for taking the SCSI device attached to @dev offline. This
4634 * function is called with host lock which protects dev->sdev
4635 * against clearing.
4636 *
4637 * LOCKING:
4638 * spin_lock_irqsave(host lock)
4639 *
4640 * RETURNS:
4641 * 1 if attached SCSI device exists, 0 otherwise.
4642 */
4643int ata_scsi_offline_dev(struct ata_device *dev)
4644{
4645 if (dev->sdev) {
4646 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
4647 return 1;
4648 }
4649 return 0;
4650}
4651
4652/**
4653 * ata_scsi_remove_dev - remove attached SCSI device
4654 * @dev: ATA device to remove attached SCSI device for
4655 *
4656 * This function is called from ata_eh_scsi_hotplug() and
4657 * responsible for removing the SCSI device attached to @dev.
4658 *
4659 * LOCKING:
4660 * Kernel thread context (may sleep).
4661 */
4662static void ata_scsi_remove_dev(struct ata_device *dev)
4663{
4664 struct ata_port *ap = dev->link->ap;
4665 struct scsi_device *sdev;
4666 unsigned long flags;
4667
4668 /* Alas, we need to grab scan_mutex to ensure SCSI device
4669 * state doesn't change underneath us and thus
4670 * scsi_device_get() always succeeds. The mutex locking can
4671 * be removed if there is __scsi_device_get() interface which
4672 * increments reference counts regardless of device state.
4673 */
4674 mutex_lock(&ap->scsi_host->scan_mutex);
4675 spin_lock_irqsave(ap->lock, flags);
4676
4677 /* clearing dev->sdev is protected by host lock */
4678 sdev = dev->sdev;
4679 dev->sdev = NULL;
4680
4681 if (sdev) {
4682 /* If user initiated unplug races with us, sdev can go
4683 * away underneath us after the host lock and
4684 * scan_mutex are released. Hold onto it.
4685 */
4686 if (scsi_device_get(sdev) == 0) {
4687 /* The following ensures the attached sdev is
4688 * offline on return from ata_scsi_offline_dev()
4689 * regardless it wins or loses the race
4690 * against this function.
4691 */
4692 scsi_device_set_state(sdev, SDEV_OFFLINE);
4693 } else {
4694 WARN_ON(1);
4695 sdev = NULL;
4696 }
4697 }
4698
4699 spin_unlock_irqrestore(ap->lock, flags);
4700 mutex_unlock(&ap->scsi_host->scan_mutex);
4701
4702 if (sdev) {
4703 ata_dev_info(dev, "detaching (SCSI %s)\n",
4704 dev_name(&sdev->sdev_gendev));
4705
4706 scsi_remove_device(sdev);
4707 scsi_device_put(sdev);
4708 }
4709}
4710
4711static void ata_scsi_handle_link_detach(struct ata_link *link)
4712{
4713 struct ata_port *ap = link->ap;
4714 struct ata_device *dev;
4715
4716 ata_for_each_dev(dev, link, ALL) {
4717 unsigned long flags;
4718
4719 spin_lock_irqsave(ap->lock, flags);
4720 if (!(dev->flags & ATA_DFLAG_DETACHED)) {
4721 spin_unlock_irqrestore(ap->lock, flags);
4722 continue;
4723 }
4724
4725 dev->flags &= ~ATA_DFLAG_DETACHED;
4726 spin_unlock_irqrestore(ap->lock, flags);
4727
4728 ata_scsi_remove_dev(dev);
4729 }
4730}
4731
4732/**
4733 * ata_scsi_media_change_notify - send media change event
4734 * @dev: Pointer to the disk device with media change event
4735 *
4736 * Tell the block layer to send a media change notification
4737 * event.
4738 *
4739 * LOCKING:
4740 * spin_lock_irqsave(host lock)
4741 */
4742void ata_scsi_media_change_notify(struct ata_device *dev)
4743{
4744 if (dev->sdev)
4745 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
4746 GFP_ATOMIC);
4747}
4748
4749/**
4750 * ata_scsi_hotplug - SCSI part of hotplug
4751 * @work: Pointer to ATA port to perform SCSI hotplug on
4752 *
4753 * Perform SCSI part of hotplug. It's executed from a separate
4754 * workqueue after EH completes. This is necessary because SCSI
4755 * hot plugging requires working EH and hot unplugging is
4756 * synchronized with hot plugging with a mutex.
4757 *
4758 * LOCKING:
4759 * Kernel thread context (may sleep).
4760 */
4761void ata_scsi_hotplug(struct work_struct *work)
4762{
4763 struct ata_port *ap =
4764 container_of(work, struct ata_port, hotplug_task.work);
4765 int i;
4766
4767 if (ap->pflags & ATA_PFLAG_UNLOADING)
4768 return;
4769
4770 mutex_lock(&ap->scsi_scan_mutex);
4771
4772 /* Unplug detached devices. We cannot use link iterator here
4773 * because PMP links have to be scanned even if PMP is
4774 * currently not attached. Iterate manually.
4775 */
4776 ata_scsi_handle_link_detach(&ap->link);
4777 if (ap->pmp_link)
4778 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
4779 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
4780
4781 /* scan for new ones */
4782 ata_scsi_scan_host(ap, 0);
4783
4784 mutex_unlock(&ap->scsi_scan_mutex);
4785}
4786
4787/**
4788 * ata_scsi_user_scan - indication for user-initiated bus scan
4789 * @shost: SCSI host to scan
4790 * @channel: Channel to scan
4791 * @id: ID to scan
4792 * @lun: LUN to scan
4793 *
4794 * This function is called when user explicitly requests bus
4795 * scan. Set probe pending flag and invoke EH.
4796 *
4797 * LOCKING:
4798 * SCSI layer (we don't care)
4799 *
4800 * RETURNS:
4801 * Zero.
4802 */
4803int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
4804 unsigned int id, u64 lun)
4805{
4806 struct ata_port *ap = ata_shost_to_port(shost);
4807 unsigned long flags;
4808 int devno, rc = 0;
4809
4810 if (lun != SCAN_WILD_CARD && lun)
4811 return -EINVAL;
4812
4813 if (!sata_pmp_attached(ap)) {
4814 if (channel != SCAN_WILD_CARD && channel)
4815 return -EINVAL;
4816 devno = id;
4817 } else {
4818 if (id != SCAN_WILD_CARD && id)
4819 return -EINVAL;
4820 devno = channel;
4821 }
4822
4823 spin_lock_irqsave(ap->lock, flags);
4824
4825 if (devno == SCAN_WILD_CARD) {
4826 struct ata_link *link;
4827
4828 ata_for_each_link(link, ap, EDGE) {
4829 struct ata_eh_info *ehi = &link->eh_info;
4830 ehi->probe_mask |= ATA_ALL_DEVICES;
4831 ehi->action |= ATA_EH_RESET;
4832 }
4833 } else {
4834 struct ata_device *dev = ata_find_dev(ap, devno);
4835
4836 if (dev) {
4837 struct ata_eh_info *ehi = &dev->link->eh_info;
4838 ehi->probe_mask |= 1 << dev->devno;
4839 ehi->action |= ATA_EH_RESET;
4840 } else
4841 rc = -EINVAL;
4842 }
4843
4844 if (rc == 0) {
4845 ata_port_schedule_eh(ap);
4846 spin_unlock_irqrestore(ap->lock, flags);
4847 ata_port_wait_eh(ap);
4848 } else
4849 spin_unlock_irqrestore(ap->lock, flags);
4850
4851 return rc;
4852}
4853
4854/**
4855 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
4856 * @work: Pointer to ATA port to perform scsi_rescan_device()
4857 *
4858 * After ATA pass thru (SAT) commands are executed successfully,
4859 * libata need to propagate the changes to SCSI layer.
4860 *
4861 * LOCKING:
4862 * Kernel thread context (may sleep).
4863 */
4864void ata_scsi_dev_rescan(struct work_struct *work)
4865{
4866 struct ata_port *ap =
4867 container_of(work, struct ata_port, scsi_rescan_task.work);
4868 struct ata_link *link;
4869 struct ata_device *dev;
4870 unsigned long flags;
4871 bool do_resume;
4872 int ret = 0;
4873
4874 mutex_lock(&ap->scsi_scan_mutex);
4875 spin_lock_irqsave(ap->lock, flags);
4876
4877 ata_for_each_link(link, ap, EDGE) {
4878 ata_for_each_dev(dev, link, ENABLED) {
4879 struct scsi_device *sdev = dev->sdev;
4880
4881 /*
4882 * If the port was suspended before this was scheduled,
4883 * bail out.
4884 */
4885 if (ap->pflags & ATA_PFLAG_SUSPENDED)
4886 goto unlock_ap;
4887
4888 if (!sdev)
4889 continue;
4890 if (scsi_device_get(sdev))
4891 continue;
4892
4893 do_resume = dev->flags & ATA_DFLAG_RESUMING;
4894
4895 spin_unlock_irqrestore(ap->lock, flags);
4896 if (do_resume) {
4897 ret = scsi_resume_device(sdev);
4898 if (ret == -EWOULDBLOCK)
4899 goto unlock_scan;
4900 dev->flags &= ~ATA_DFLAG_RESUMING;
4901 }
4902 ret = scsi_rescan_device(sdev);
4903 scsi_device_put(sdev);
4904 spin_lock_irqsave(ap->lock, flags);
4905
4906 if (ret)
4907 goto unlock_ap;
4908 }
4909 }
4910
4911unlock_ap:
4912 spin_unlock_irqrestore(ap->lock, flags);
4913unlock_scan:
4914 mutex_unlock(&ap->scsi_scan_mutex);
4915
4916 /* Reschedule with a delay if scsi_rescan_device() returned an error */
4917 if (ret)
4918 schedule_delayed_work(&ap->scsi_rescan_task,
4919 msecs_to_jiffies(5));
4920}