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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 <asm/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 576
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
59
60static const u8 def_rw_recovery_mpage[RW_RECOVERY_MPAGE_LEN] = {
61 RW_RECOVERY_MPAGE,
62 RW_RECOVERY_MPAGE_LEN - 2,
63 (1 << 7), /* AWRE */
64 0, /* read retry count */
65 0, 0, 0, 0,
66 0, /* write retry count */
67 0, 0, 0
68};
69
70static const u8 def_cache_mpage[CACHE_MPAGE_LEN] = {
71 CACHE_MPAGE,
72 CACHE_MPAGE_LEN - 2,
73 0, /* contains WCE, needs to be 0 for logic */
74 0, 0, 0, 0, 0, 0, 0, 0, 0,
75 0, /* contains DRA, needs to be 0 for logic */
76 0, 0, 0, 0, 0, 0, 0
77};
78
79static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
80 CONTROL_MPAGE,
81 CONTROL_MPAGE_LEN - 2,
82 2, /* DSENSE=0, GLTSD=1 */
83 0, /* [QAM+QERR may be 1, see 05-359r1] */
84 0, 0, 0, 0, 0xff, 0xff,
85 0, 30 /* extended self test time, see 05-359r1 */
86};
87
88static ssize_t ata_scsi_park_show(struct device *device,
89 struct device_attribute *attr, char *buf)
90{
91 struct scsi_device *sdev = to_scsi_device(device);
92 struct ata_port *ap;
93 struct ata_link *link;
94 struct ata_device *dev;
95 unsigned long now;
96 unsigned int msecs;
97 int rc = 0;
98
99 ap = ata_shost_to_port(sdev->host);
100
101 spin_lock_irq(ap->lock);
102 dev = ata_scsi_find_dev(ap, sdev);
103 if (!dev) {
104 rc = -ENODEV;
105 goto unlock;
106 }
107 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
108 rc = -EOPNOTSUPP;
109 goto unlock;
110 }
111
112 link = dev->link;
113 now = jiffies;
114 if (ap->pflags & ATA_PFLAG_EH_IN_PROGRESS &&
115 link->eh_context.unloaded_mask & (1 << dev->devno) &&
116 time_after(dev->unpark_deadline, now))
117 msecs = jiffies_to_msecs(dev->unpark_deadline - now);
118 else
119 msecs = 0;
120
121unlock:
122 spin_unlock_irq(ap->lock);
123
124 return rc ? rc : snprintf(buf, 20, "%u\n", msecs);
125}
126
127static ssize_t ata_scsi_park_store(struct device *device,
128 struct device_attribute *attr,
129 const char *buf, size_t len)
130{
131 struct scsi_device *sdev = to_scsi_device(device);
132 struct ata_port *ap;
133 struct ata_device *dev;
134 long int input;
135 unsigned long flags;
136 int rc;
137
138 rc = kstrtol(buf, 10, &input);
139 if (rc)
140 return rc;
141 if (input < -2)
142 return -EINVAL;
143 if (input > ATA_TMOUT_MAX_PARK) {
144 rc = -EOVERFLOW;
145 input = ATA_TMOUT_MAX_PARK;
146 }
147
148 ap = ata_shost_to_port(sdev->host);
149
150 spin_lock_irqsave(ap->lock, flags);
151 dev = ata_scsi_find_dev(ap, sdev);
152 if (unlikely(!dev)) {
153 rc = -ENODEV;
154 goto unlock;
155 }
156 if (dev->class != ATA_DEV_ATA &&
157 dev->class != ATA_DEV_ZAC) {
158 rc = -EOPNOTSUPP;
159 goto unlock;
160 }
161
162 if (input >= 0) {
163 if (dev->flags & ATA_DFLAG_NO_UNLOAD) {
164 rc = -EOPNOTSUPP;
165 goto unlock;
166 }
167
168 dev->unpark_deadline = ata_deadline(jiffies, input);
169 dev->link->eh_info.dev_action[dev->devno] |= ATA_EH_PARK;
170 ata_port_schedule_eh(ap);
171 complete(&ap->park_req_pending);
172 } else {
173 switch (input) {
174 case -1:
175 dev->flags &= ~ATA_DFLAG_NO_UNLOAD;
176 break;
177 case -2:
178 dev->flags |= ATA_DFLAG_NO_UNLOAD;
179 break;
180 }
181 }
182unlock:
183 spin_unlock_irqrestore(ap->lock, flags);
184
185 return rc ? rc : len;
186}
187DEVICE_ATTR(unload_heads, S_IRUGO | S_IWUSR,
188 ata_scsi_park_show, ata_scsi_park_store);
189EXPORT_SYMBOL_GPL(dev_attr_unload_heads);
190
191void ata_scsi_set_sense(struct ata_device *dev, struct scsi_cmnd *cmd,
192 u8 sk, u8 asc, u8 ascq)
193{
194 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
195
196 if (!cmd)
197 return;
198
199 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
200
201 scsi_build_sense_buffer(d_sense, cmd->sense_buffer, sk, asc, ascq);
202}
203
204void ata_scsi_set_sense_information(struct ata_device *dev,
205 struct scsi_cmnd *cmd,
206 const struct ata_taskfile *tf)
207{
208 u64 information;
209
210 if (!cmd)
211 return;
212
213 information = ata_tf_read_block(tf, dev);
214 if (information == U64_MAX)
215 return;
216
217 scsi_set_sense_information(cmd->sense_buffer,
218 SCSI_SENSE_BUFFERSIZE, information);
219}
220
221static void ata_scsi_set_invalid_field(struct ata_device *dev,
222 struct scsi_cmnd *cmd, u16 field, u8 bit)
223{
224 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x24, 0x0);
225 /* "Invalid field in CDB" */
226 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
227 field, bit, 1);
228}
229
230static void ata_scsi_set_invalid_parameter(struct ata_device *dev,
231 struct scsi_cmnd *cmd, u16 field)
232{
233 /* "Invalid field in parameter list" */
234 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x26, 0x0);
235 scsi_set_sense_field_pointer(cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE,
236 field, 0xff, 0);
237}
238
239struct device_attribute *ata_common_sdev_attrs[] = {
240 &dev_attr_unload_heads,
241 NULL
242};
243EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
244
245/**
246 * ata_std_bios_param - generic bios head/sector/cylinder calculator used by sd.
247 * @sdev: SCSI device for which BIOS geometry is to be determined
248 * @bdev: block device associated with @sdev
249 * @capacity: capacity of SCSI device
250 * @geom: location to which geometry will be output
251 *
252 * Generic bios head/sector/cylinder calculator
253 * used by sd. Most BIOSes nowadays expect a XXX/255/16 (CHS)
254 * mapping. Some situations may arise where the disk is not
255 * bootable if this is not used.
256 *
257 * LOCKING:
258 * Defined by the SCSI layer. We don't really care.
259 *
260 * RETURNS:
261 * Zero.
262 */
263int ata_std_bios_param(struct scsi_device *sdev, struct block_device *bdev,
264 sector_t capacity, int geom[])
265{
266 geom[0] = 255;
267 geom[1] = 63;
268 sector_div(capacity, 255*63);
269 geom[2] = capacity;
270
271 return 0;
272}
273EXPORT_SYMBOL_GPL(ata_std_bios_param);
274
275/**
276 * ata_scsi_unlock_native_capacity - unlock native capacity
277 * @sdev: SCSI device to adjust device capacity for
278 *
279 * This function is called if a partition on @sdev extends beyond
280 * the end of the device. It requests EH to unlock HPA.
281 *
282 * LOCKING:
283 * Defined by the SCSI layer. Might sleep.
284 */
285void ata_scsi_unlock_native_capacity(struct scsi_device *sdev)
286{
287 struct ata_port *ap = ata_shost_to_port(sdev->host);
288 struct ata_device *dev;
289 unsigned long flags;
290
291 spin_lock_irqsave(ap->lock, flags);
292
293 dev = ata_scsi_find_dev(ap, sdev);
294 if (dev && dev->n_sectors < dev->n_native_sectors) {
295 dev->flags |= ATA_DFLAG_UNLOCK_HPA;
296 dev->link->eh_info.action |= ATA_EH_RESET;
297 ata_port_schedule_eh(ap);
298 }
299
300 spin_unlock_irqrestore(ap->lock, flags);
301 ata_port_wait_eh(ap);
302}
303EXPORT_SYMBOL_GPL(ata_scsi_unlock_native_capacity);
304
305/**
306 * ata_get_identity - Handler for HDIO_GET_IDENTITY ioctl
307 * @ap: target port
308 * @sdev: SCSI device to get identify data for
309 * @arg: User buffer area for identify data
310 *
311 * LOCKING:
312 * Defined by the SCSI layer. We don't really care.
313 *
314 * RETURNS:
315 * Zero on success, negative errno on error.
316 */
317static int ata_get_identity(struct ata_port *ap, struct scsi_device *sdev,
318 void __user *arg)
319{
320 struct ata_device *dev = ata_scsi_find_dev(ap, sdev);
321 u16 __user *dst = arg;
322 char buf[40];
323
324 if (!dev)
325 return -ENOMSG;
326
327 if (copy_to_user(dst, dev->id, ATA_ID_WORDS * sizeof(u16)))
328 return -EFAULT;
329
330 ata_id_string(dev->id, buf, ATA_ID_PROD, ATA_ID_PROD_LEN);
331 if (copy_to_user(dst + ATA_ID_PROD, buf, ATA_ID_PROD_LEN))
332 return -EFAULT;
333
334 ata_id_string(dev->id, buf, ATA_ID_FW_REV, ATA_ID_FW_REV_LEN);
335 if (copy_to_user(dst + ATA_ID_FW_REV, buf, ATA_ID_FW_REV_LEN))
336 return -EFAULT;
337
338 ata_id_string(dev->id, buf, ATA_ID_SERNO, ATA_ID_SERNO_LEN);
339 if (copy_to_user(dst + ATA_ID_SERNO, buf, ATA_ID_SERNO_LEN))
340 return -EFAULT;
341
342 return 0;
343}
344
345/**
346 * ata_cmd_ioctl - Handler for HDIO_DRIVE_CMD ioctl
347 * @scsidev: Device to which we are issuing command
348 * @arg: User provided data for issuing command
349 *
350 * LOCKING:
351 * Defined by the SCSI layer. We don't really care.
352 *
353 * RETURNS:
354 * Zero on success, negative errno on error.
355 */
356int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg)
357{
358 int rc = 0;
359 u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
360 u8 scsi_cmd[MAX_COMMAND_SIZE];
361 u8 args[4], *argbuf = NULL;
362 int argsize = 0;
363 enum dma_data_direction data_dir;
364 struct scsi_sense_hdr sshdr;
365 int cmd_result;
366
367 if (arg == NULL)
368 return -EINVAL;
369
370 if (copy_from_user(args, arg, sizeof(args)))
371 return -EFAULT;
372
373 memset(sensebuf, 0, sizeof(sensebuf));
374 memset(scsi_cmd, 0, sizeof(scsi_cmd));
375
376 if (args[3]) {
377 argsize = ATA_SECT_SIZE * args[3];
378 argbuf = kmalloc(argsize, GFP_KERNEL);
379 if (argbuf == NULL) {
380 rc = -ENOMEM;
381 goto error;
382 }
383
384 scsi_cmd[1] = (4 << 1); /* PIO Data-in */
385 scsi_cmd[2] = 0x0e; /* no off.line or cc, read from dev,
386 block count in sector count field */
387 data_dir = DMA_FROM_DEVICE;
388 } else {
389 scsi_cmd[1] = (3 << 1); /* Non-data */
390 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
391 data_dir = DMA_NONE;
392 }
393
394 scsi_cmd[0] = ATA_16;
395
396 scsi_cmd[4] = args[2];
397 if (args[0] == ATA_CMD_SMART) { /* hack -- ide driver does this too */
398 scsi_cmd[6] = args[3];
399 scsi_cmd[8] = args[1];
400 scsi_cmd[10] = ATA_SMART_LBAM_PASS;
401 scsi_cmd[12] = ATA_SMART_LBAH_PASS;
402 } else {
403 scsi_cmd[6] = args[1];
404 }
405 scsi_cmd[14] = args[0];
406
407 /* Good values for timeout and retries? Values below
408 from scsi_ioctl_send_command() for default case... */
409 cmd_result = scsi_execute(scsidev, scsi_cmd, data_dir, argbuf, argsize,
410 sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL);
411
412 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
413 u8 *desc = sensebuf + 8;
414 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
415
416 /* If we set cc then ATA pass-through will cause a
417 * check condition even if no error. Filter that. */
418 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
419 if (sshdr.sense_key == RECOVERED_ERROR &&
420 sshdr.asc == 0 && sshdr.ascq == 0x1d)
421 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
422 }
423
424 /* Send userspace a few ATA registers (same as drivers/ide) */
425 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
426 desc[0] == 0x09) { /* code is "ATA Descriptor" */
427 args[0] = desc[13]; /* status */
428 args[1] = desc[3]; /* error */
429 args[2] = desc[5]; /* sector count (0:7) */
430 if (copy_to_user(arg, args, sizeof(args)))
431 rc = -EFAULT;
432 }
433 }
434
435
436 if (cmd_result) {
437 rc = -EIO;
438 goto error;
439 }
440
441 if ((argbuf)
442 && copy_to_user(arg + sizeof(args), argbuf, argsize))
443 rc = -EFAULT;
444error:
445 kfree(argbuf);
446 return rc;
447}
448
449/**
450 * ata_task_ioctl - Handler for HDIO_DRIVE_TASK ioctl
451 * @scsidev: Device to which we are issuing command
452 * @arg: User provided data for issuing command
453 *
454 * LOCKING:
455 * Defined by the SCSI layer. We don't really care.
456 *
457 * RETURNS:
458 * Zero on success, negative errno on error.
459 */
460int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
461{
462 int rc = 0;
463 u8 sensebuf[SCSI_SENSE_BUFFERSIZE];
464 u8 scsi_cmd[MAX_COMMAND_SIZE];
465 u8 args[7];
466 struct scsi_sense_hdr sshdr;
467 int cmd_result;
468
469 if (arg == NULL)
470 return -EINVAL;
471
472 if (copy_from_user(args, arg, sizeof(args)))
473 return -EFAULT;
474
475 memset(sensebuf, 0, sizeof(sensebuf));
476 memset(scsi_cmd, 0, sizeof(scsi_cmd));
477 scsi_cmd[0] = ATA_16;
478 scsi_cmd[1] = (3 << 1); /* Non-data */
479 scsi_cmd[2] = 0x20; /* cc but no off.line or data xfer */
480 scsi_cmd[4] = args[1];
481 scsi_cmd[6] = args[2];
482 scsi_cmd[8] = args[3];
483 scsi_cmd[10] = args[4];
484 scsi_cmd[12] = args[5];
485 scsi_cmd[13] = args[6] & 0x4f;
486 scsi_cmd[14] = args[0];
487
488 /* Good values for timeout and retries? Values below
489 from scsi_ioctl_send_command() for default case... */
490 cmd_result = scsi_execute(scsidev, scsi_cmd, DMA_NONE, NULL, 0,
491 sensebuf, &sshdr, (10*HZ), 5, 0, 0, NULL);
492
493 if (driver_byte(cmd_result) == DRIVER_SENSE) {/* sense data available */
494 u8 *desc = sensebuf + 8;
495 cmd_result &= ~(0xFF<<24); /* DRIVER_SENSE is not an error */
496
497 /* If we set cc then ATA pass-through will cause a
498 * check condition even if no error. Filter that. */
499 if (cmd_result & SAM_STAT_CHECK_CONDITION) {
500 if (sshdr.sense_key == RECOVERED_ERROR &&
501 sshdr.asc == 0 && sshdr.ascq == 0x1d)
502 cmd_result &= ~SAM_STAT_CHECK_CONDITION;
503 }
504
505 /* Send userspace ATA registers */
506 if (sensebuf[0] == 0x72 && /* format is "descriptor" */
507 desc[0] == 0x09) {/* code is "ATA Descriptor" */
508 args[0] = desc[13]; /* status */
509 args[1] = desc[3]; /* error */
510 args[2] = desc[5]; /* sector count (0:7) */
511 args[3] = desc[7]; /* lbal */
512 args[4] = desc[9]; /* lbam */
513 args[5] = desc[11]; /* lbah */
514 args[6] = desc[12]; /* select */
515 if (copy_to_user(arg, args, sizeof(args)))
516 rc = -EFAULT;
517 }
518 }
519
520 if (cmd_result) {
521 rc = -EIO;
522 goto error;
523 }
524
525 error:
526 return rc;
527}
528
529static int ata_ioc32(struct ata_port *ap)
530{
531 if (ap->flags & ATA_FLAG_PIO_DMA)
532 return 1;
533 if (ap->pflags & ATA_PFLAG_PIO32)
534 return 1;
535 return 0;
536}
537
538/*
539 * This handles both native and compat commands, so anything added
540 * here must have a compatible argument, or check in_compat_syscall()
541 */
542int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
543 unsigned int cmd, void __user *arg)
544{
545 unsigned long val;
546 int rc = -EINVAL;
547 unsigned long flags;
548
549 switch (cmd) {
550 case HDIO_GET_32BIT:
551 spin_lock_irqsave(ap->lock, flags);
552 val = ata_ioc32(ap);
553 spin_unlock_irqrestore(ap->lock, flags);
554#ifdef CONFIG_COMPAT
555 if (in_compat_syscall())
556 return put_user(val, (compat_ulong_t __user *)arg);
557#endif
558 return put_user(val, (unsigned long __user *)arg);
559
560 case HDIO_SET_32BIT:
561 val = (unsigned long) arg;
562 rc = 0;
563 spin_lock_irqsave(ap->lock, flags);
564 if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
565 if (val)
566 ap->pflags |= ATA_PFLAG_PIO32;
567 else
568 ap->pflags &= ~ATA_PFLAG_PIO32;
569 } else {
570 if (val != ata_ioc32(ap))
571 rc = -EINVAL;
572 }
573 spin_unlock_irqrestore(ap->lock, flags);
574 return rc;
575
576 case HDIO_GET_IDENTITY:
577 return ata_get_identity(ap, scsidev, arg);
578
579 case HDIO_DRIVE_CMD:
580 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
581 return -EACCES;
582 return ata_cmd_ioctl(scsidev, arg);
583
584 case HDIO_DRIVE_TASK:
585 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
586 return -EACCES;
587 return ata_task_ioctl(scsidev, arg);
588
589 default:
590 rc = -ENOTTY;
591 break;
592 }
593
594 return rc;
595}
596EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
597
598int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd,
599 void __user *arg)
600{
601 return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
602 scsidev, cmd, arg);
603}
604EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
605
606/**
607 * ata_scsi_qc_new - acquire new ata_queued_cmd reference
608 * @dev: ATA device to which the new command is attached
609 * @cmd: SCSI command that originated this ATA command
610 *
611 * Obtain a reference to an unused ata_queued_cmd structure,
612 * which is the basic libata structure representing a single
613 * ATA command sent to the hardware.
614 *
615 * If a command was available, fill in the SCSI-specific
616 * portions of the structure with information on the
617 * current command.
618 *
619 * LOCKING:
620 * spin_lock_irqsave(host lock)
621 *
622 * RETURNS:
623 * Command allocated, or %NULL if none available.
624 */
625static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
626 struct scsi_cmnd *cmd)
627{
628 struct ata_queued_cmd *qc;
629
630 qc = ata_qc_new_init(dev, cmd->request->tag);
631 if (qc) {
632 qc->scsicmd = cmd;
633 qc->scsidone = cmd->scsi_done;
634
635 qc->sg = scsi_sglist(cmd);
636 qc->n_elem = scsi_sg_count(cmd);
637
638 if (cmd->request->rq_flags & RQF_QUIET)
639 qc->flags |= ATA_QCFLAG_QUIET;
640 } else {
641 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
642 cmd->scsi_done(cmd);
643 }
644
645 return qc;
646}
647
648static void ata_qc_set_pc_nbytes(struct ata_queued_cmd *qc)
649{
650 struct scsi_cmnd *scmd = qc->scsicmd;
651
652 qc->extrabytes = scmd->extra_len;
653 qc->nbytes = scsi_bufflen(scmd) + qc->extrabytes;
654}
655
656/**
657 * ata_dump_status - user friendly display of error info
658 * @id: id of the port in question
659 * @tf: ptr to filled out taskfile
660 *
661 * Decode and dump the ATA error/status registers for the user so
662 * that they have some idea what really happened at the non
663 * make-believe layer.
664 *
665 * LOCKING:
666 * inherited from caller
667 */
668static void ata_dump_status(unsigned id, struct ata_taskfile *tf)
669{
670 u8 stat = tf->command, err = tf->feature;
671
672 pr_warn("ata%u: status=0x%02x { ", id, stat);
673 if (stat & ATA_BUSY) {
674 pr_cont("Busy }\n"); /* Data is not valid in this case */
675 } else {
676 if (stat & ATA_DRDY) pr_cont("DriveReady ");
677 if (stat & ATA_DF) pr_cont("DeviceFault ");
678 if (stat & ATA_DSC) pr_cont("SeekComplete ");
679 if (stat & ATA_DRQ) pr_cont("DataRequest ");
680 if (stat & ATA_CORR) pr_cont("CorrectedError ");
681 if (stat & ATA_SENSE) pr_cont("Sense ");
682 if (stat & ATA_ERR) pr_cont("Error ");
683 pr_cont("}\n");
684
685 if (err) {
686 pr_warn("ata%u: error=0x%02x { ", id, err);
687 if (err & ATA_ABORTED) pr_cont("DriveStatusError ");
688 if (err & ATA_ICRC) {
689 if (err & ATA_ABORTED)
690 pr_cont("BadCRC ");
691 else pr_cont("Sector ");
692 }
693 if (err & ATA_UNC) pr_cont("UncorrectableError ");
694 if (err & ATA_IDNF) pr_cont("SectorIdNotFound ");
695 if (err & ATA_TRK0NF) pr_cont("TrackZeroNotFound ");
696 if (err & ATA_AMNF) pr_cont("AddrMarkNotFound ");
697 pr_cont("}\n");
698 }
699 }
700}
701
702/**
703 * ata_to_sense_error - convert ATA error to SCSI error
704 * @id: ATA device number
705 * @drv_stat: value contained in ATA status register
706 * @drv_err: value contained in ATA error register
707 * @sk: the sense key we'll fill out
708 * @asc: the additional sense code we'll fill out
709 * @ascq: the additional sense code qualifier we'll fill out
710 * @verbose: be verbose
711 *
712 * Converts an ATA error into a SCSI error. Fill out pointers to
713 * SK, ASC, and ASCQ bytes for later use in fixed or descriptor
714 * format sense blocks.
715 *
716 * LOCKING:
717 * spin_lock_irqsave(host lock)
718 */
719static void ata_to_sense_error(unsigned id, u8 drv_stat, u8 drv_err, u8 *sk,
720 u8 *asc, u8 *ascq, int verbose)
721{
722 int i;
723
724 /* Based on the 3ware driver translation table */
725 static const unsigned char sense_table[][4] = {
726 /* BBD|ECC|ID|MAR */
727 {0xd1, ABORTED_COMMAND, 0x00, 0x00},
728 // Device busy Aborted command
729 /* BBD|ECC|ID */
730 {0xd0, ABORTED_COMMAND, 0x00, 0x00},
731 // Device busy Aborted command
732 /* ECC|MC|MARK */
733 {0x61, HARDWARE_ERROR, 0x00, 0x00},
734 // Device fault Hardware error
735 /* ICRC|ABRT */ /* NB: ICRC & !ABRT is BBD */
736 {0x84, ABORTED_COMMAND, 0x47, 0x00},
737 // Data CRC error SCSI parity error
738 /* MC|ID|ABRT|TRK0|MARK */
739 {0x37, NOT_READY, 0x04, 0x00},
740 // Unit offline Not ready
741 /* MCR|MARK */
742 {0x09, NOT_READY, 0x04, 0x00},
743 // Unrecovered disk error Not ready
744 /* Bad address mark */
745 {0x01, MEDIUM_ERROR, 0x13, 0x00},
746 // Address mark not found for data field
747 /* TRK0 - Track 0 not found */
748 {0x02, HARDWARE_ERROR, 0x00, 0x00},
749 // Hardware error
750 /* Abort: 0x04 is not translated here, see below */
751 /* Media change request */
752 {0x08, NOT_READY, 0x04, 0x00},
753 // FIXME: faking offline
754 /* SRV/IDNF - ID not found */
755 {0x10, ILLEGAL_REQUEST, 0x21, 0x00},
756 // Logical address out of range
757 /* MC - Media Changed */
758 {0x20, UNIT_ATTENTION, 0x28, 0x00},
759 // Not ready to ready change, medium may have changed
760 /* ECC - Uncorrectable ECC error */
761 {0x40, MEDIUM_ERROR, 0x11, 0x04},
762 // Unrecovered read error
763 /* BBD - block marked bad */
764 {0x80, MEDIUM_ERROR, 0x11, 0x04},
765 // Block marked bad Medium error, unrecovered read error
766 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
767 };
768 static const unsigned char stat_table[][4] = {
769 /* Must be first because BUSY means no other bits valid */
770 {0x80, ABORTED_COMMAND, 0x47, 0x00},
771 // Busy, fake parity for now
772 {0x40, ILLEGAL_REQUEST, 0x21, 0x04},
773 // Device ready, unaligned write command
774 {0x20, HARDWARE_ERROR, 0x44, 0x00},
775 // Device fault, internal target failure
776 {0x08, ABORTED_COMMAND, 0x47, 0x00},
777 // Timed out in xfer, fake parity for now
778 {0x04, RECOVERED_ERROR, 0x11, 0x00},
779 // Recovered ECC error Medium error, recovered
780 {0xFF, 0xFF, 0xFF, 0xFF}, // END mark
781 };
782
783 /*
784 * Is this an error we can process/parse
785 */
786 if (drv_stat & ATA_BUSY) {
787 drv_err = 0; /* Ignore the err bits, they're invalid */
788 }
789
790 if (drv_err) {
791 /* Look for drv_err */
792 for (i = 0; sense_table[i][0] != 0xFF; i++) {
793 /* Look for best matches first */
794 if ((sense_table[i][0] & drv_err) ==
795 sense_table[i][0]) {
796 *sk = sense_table[i][1];
797 *asc = sense_table[i][2];
798 *ascq = sense_table[i][3];
799 goto translate_done;
800 }
801 }
802 }
803
804 /*
805 * Fall back to interpreting status bits. Note that if the drv_err
806 * has only the ABRT bit set, we decode drv_stat. ABRT by itself
807 * is not descriptive enough.
808 */
809 for (i = 0; stat_table[i][0] != 0xFF; i++) {
810 if (stat_table[i][0] & drv_stat) {
811 *sk = stat_table[i][1];
812 *asc = stat_table[i][2];
813 *ascq = stat_table[i][3];
814 goto translate_done;
815 }
816 }
817
818 /*
819 * We need a sensible error return here, which is tricky, and one
820 * that won't cause people to do things like return a disk wrongly.
821 */
822 *sk = ABORTED_COMMAND;
823 *asc = 0x00;
824 *ascq = 0x00;
825
826 translate_done:
827 if (verbose)
828 pr_err("ata%u: translated ATA stat/err 0x%02x/%02x to SCSI SK/ASC/ASCQ 0x%x/%02x/%02x\n",
829 id, drv_stat, drv_err, *sk, *asc, *ascq);
830 return;
831}
832
833/*
834 * ata_gen_passthru_sense - Generate check condition sense block.
835 * @qc: Command that completed.
836 *
837 * This function is specific to the ATA descriptor format sense
838 * block specified for the ATA pass through commands. Regardless
839 * of whether the command errored or not, return a sense
840 * block. Copy all controller registers into the sense
841 * block. If there was no error, we get the request from an ATA
842 * passthrough command, so we use the following sense data:
843 * sk = RECOVERED ERROR
844 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
845 *
846 *
847 * LOCKING:
848 * None.
849 */
850static void ata_gen_passthru_sense(struct ata_queued_cmd *qc)
851{
852 struct scsi_cmnd *cmd = qc->scsicmd;
853 struct ata_taskfile *tf = &qc->result_tf;
854 unsigned char *sb = cmd->sense_buffer;
855 unsigned char *desc = sb + 8;
856 int verbose = qc->ap->ops->error_handler == NULL;
857 u8 sense_key, asc, ascq;
858
859 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
860
861 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
862
863 /*
864 * Use ata_to_sense_error() to map status register bits
865 * onto sense key, asc & ascq.
866 */
867 if (qc->err_mask ||
868 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
869 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
870 &sense_key, &asc, &ascq, verbose);
871 ata_scsi_set_sense(qc->dev, cmd, sense_key, asc, ascq);
872 } else {
873 /*
874 * ATA PASS-THROUGH INFORMATION AVAILABLE
875 * Always in descriptor format sense.
876 */
877 scsi_build_sense_buffer(1, cmd->sense_buffer,
878 RECOVERED_ERROR, 0, 0x1D);
879 }
880
881 if ((cmd->sense_buffer[0] & 0x7f) >= 0x72) {
882 u8 len;
883
884 /* descriptor format */
885 len = sb[7];
886 desc = (char *)scsi_sense_desc_find(sb, len + 8, 9);
887 if (!desc) {
888 if (SCSI_SENSE_BUFFERSIZE < len + 14)
889 return;
890 sb[7] = len + 14;
891 desc = sb + 8 + len;
892 }
893 desc[0] = 9;
894 desc[1] = 12;
895 /*
896 * Copy registers into sense buffer.
897 */
898 desc[2] = 0x00;
899 desc[3] = tf->feature; /* == error reg */
900 desc[5] = tf->nsect;
901 desc[7] = tf->lbal;
902 desc[9] = tf->lbam;
903 desc[11] = tf->lbah;
904 desc[12] = tf->device;
905 desc[13] = tf->command; /* == status reg */
906
907 /*
908 * Fill in Extend bit, and the high order bytes
909 * if applicable.
910 */
911 if (tf->flags & ATA_TFLAG_LBA48) {
912 desc[2] |= 0x01;
913 desc[4] = tf->hob_nsect;
914 desc[6] = tf->hob_lbal;
915 desc[8] = tf->hob_lbam;
916 desc[10] = tf->hob_lbah;
917 }
918 } else {
919 /* Fixed sense format */
920 desc[0] = tf->feature;
921 desc[1] = tf->command; /* status */
922 desc[2] = tf->device;
923 desc[3] = tf->nsect;
924 desc[7] = 0;
925 if (tf->flags & ATA_TFLAG_LBA48) {
926 desc[8] |= 0x80;
927 if (tf->hob_nsect)
928 desc[8] |= 0x40;
929 if (tf->hob_lbal || tf->hob_lbam || tf->hob_lbah)
930 desc[8] |= 0x20;
931 }
932 desc[9] = tf->lbal;
933 desc[10] = tf->lbam;
934 desc[11] = tf->lbah;
935 }
936}
937
938/**
939 * ata_gen_ata_sense - generate a SCSI fixed sense block
940 * @qc: Command that we are erroring out
941 *
942 * Generate sense block for a failed ATA command @qc. Descriptor
943 * format is used to accommodate LBA48 block address.
944 *
945 * LOCKING:
946 * None.
947 */
948static void ata_gen_ata_sense(struct ata_queued_cmd *qc)
949{
950 struct ata_device *dev = qc->dev;
951 struct scsi_cmnd *cmd = qc->scsicmd;
952 struct ata_taskfile *tf = &qc->result_tf;
953 unsigned char *sb = cmd->sense_buffer;
954 int verbose = qc->ap->ops->error_handler == NULL;
955 u64 block;
956 u8 sense_key, asc, ascq;
957
958 memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
959
960 cmd->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
961
962 if (ata_dev_disabled(dev)) {
963 /* Device disabled after error recovery */
964 /* LOGICAL UNIT NOT READY, HARD RESET REQUIRED */
965 ata_scsi_set_sense(dev, cmd, NOT_READY, 0x04, 0x21);
966 return;
967 }
968 /* Use ata_to_sense_error() to map status register bits
969 * onto sense key, asc & ascq.
970 */
971 if (qc->err_mask ||
972 tf->command & (ATA_BUSY | ATA_DF | ATA_ERR | ATA_DRQ)) {
973 ata_to_sense_error(qc->ap->print_id, tf->command, tf->feature,
974 &sense_key, &asc, &ascq, verbose);
975 ata_scsi_set_sense(dev, cmd, sense_key, asc, ascq);
976 } else {
977 /* Could not decode error */
978 ata_dev_warn(dev, "could not decode error status 0x%x err_mask 0x%x\n",
979 tf->command, qc->err_mask);
980 ata_scsi_set_sense(dev, cmd, ABORTED_COMMAND, 0, 0);
981 return;
982 }
983
984 block = ata_tf_read_block(&qc->result_tf, dev);
985 if (block == U64_MAX)
986 return;
987
988 scsi_set_sense_information(sb, SCSI_SENSE_BUFFERSIZE, block);
989}
990
991void ata_scsi_sdev_config(struct scsi_device *sdev)
992{
993 sdev->use_10_for_rw = 1;
994 sdev->use_10_for_ms = 1;
995 sdev->no_write_same = 1;
996
997 /* Schedule policy is determined by ->qc_defer() callback and
998 * it needs to see every deferred qc. Set dev_blocked to 1 to
999 * prevent SCSI midlayer from automatically deferring
1000 * requests.
1001 */
1002 sdev->max_device_blocked = 1;
1003}
1004
1005/**
1006 * atapi_drain_needed - Check whether data transfer may overflow
1007 * @rq: request to be checked
1008 *
1009 * ATAPI commands which transfer variable length data to host
1010 * might overflow due to application error or hardware bug. This
1011 * function checks whether overflow should be drained and ignored
1012 * for @request.
1013 *
1014 * LOCKING:
1015 * None.
1016 *
1017 * RETURNS:
1018 * 1 if ; otherwise, 0.
1019 */
1020bool ata_scsi_dma_need_drain(struct request *rq)
1021{
1022 return atapi_cmd_type(scsi_req(rq)->cmd[0]) == ATAPI_MISC;
1023}
1024EXPORT_SYMBOL_GPL(ata_scsi_dma_need_drain);
1025
1026int ata_scsi_dev_config(struct scsi_device *sdev, struct ata_device *dev)
1027{
1028 struct request_queue *q = sdev->request_queue;
1029
1030 if (!ata_id_has_unload(dev->id))
1031 dev->flags |= ATA_DFLAG_NO_UNLOAD;
1032
1033 /* configure max sectors */
1034 blk_queue_max_hw_sectors(q, dev->max_sectors);
1035
1036 if (dev->class == ATA_DEV_ATAPI) {
1037 sdev->sector_size = ATA_SECT_SIZE;
1038
1039 /* set DMA padding */
1040 blk_queue_update_dma_pad(q, ATA_DMA_PAD_SZ - 1);
1041
1042 /* make room for appending the drain */
1043 blk_queue_max_segments(q, queue_max_segments(q) - 1);
1044
1045 sdev->dma_drain_len = ATAPI_MAX_DRAIN;
1046 sdev->dma_drain_buf = kmalloc(sdev->dma_drain_len,
1047 q->bounce_gfp | GFP_KERNEL);
1048 if (!sdev->dma_drain_buf) {
1049 ata_dev_err(dev, "drain buffer allocation failed\n");
1050 return -ENOMEM;
1051 }
1052 } else {
1053 sdev->sector_size = ata_id_logical_sector_size(dev->id);
1054 sdev->manage_start_stop = 1;
1055 }
1056
1057 /*
1058 * ata_pio_sectors() expects buffer for each sector to not cross
1059 * page boundary. Enforce it by requiring buffers to be sector
1060 * aligned, which works iff sector_size is not larger than
1061 * PAGE_SIZE. ATAPI devices also need the alignment as
1062 * IDENTIFY_PACKET is executed as ATA_PROT_PIO.
1063 */
1064 if (sdev->sector_size > PAGE_SIZE)
1065 ata_dev_warn(dev,
1066 "sector_size=%u > PAGE_SIZE, PIO may malfunction\n",
1067 sdev->sector_size);
1068
1069 blk_queue_update_dma_alignment(q, sdev->sector_size - 1);
1070
1071 if (dev->flags & ATA_DFLAG_AN)
1072 set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events);
1073
1074 if (dev->flags & ATA_DFLAG_NCQ) {
1075 int depth;
1076
1077 depth = min(sdev->host->can_queue, ata_id_queue_depth(dev->id));
1078 depth = min(ATA_MAX_QUEUE, depth);
1079 scsi_change_queue_depth(sdev, depth);
1080 }
1081
1082 if (dev->flags & ATA_DFLAG_TRUSTED)
1083 sdev->security_supported = 1;
1084
1085 dev->sdev = sdev;
1086 return 0;
1087}
1088
1089/**
1090 * ata_scsi_slave_config - Set SCSI device attributes
1091 * @sdev: SCSI device to examine
1092 *
1093 * This is called before we actually start reading
1094 * and writing to the device, to configure certain
1095 * SCSI mid-layer behaviors.
1096 *
1097 * LOCKING:
1098 * Defined by SCSI layer. We don't really care.
1099 */
1100
1101int ata_scsi_slave_config(struct scsi_device *sdev)
1102{
1103 struct ata_port *ap = ata_shost_to_port(sdev->host);
1104 struct ata_device *dev = __ata_scsi_find_dev(ap, sdev);
1105 int rc = 0;
1106
1107 ata_scsi_sdev_config(sdev);
1108
1109 if (dev)
1110 rc = ata_scsi_dev_config(sdev, dev);
1111
1112 return rc;
1113}
1114EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
1115
1116/**
1117 * ata_scsi_slave_destroy - SCSI device is about to be destroyed
1118 * @sdev: SCSI device to be destroyed
1119 *
1120 * @sdev is about to be destroyed for hot/warm unplugging. If
1121 * this unplugging was initiated by libata as indicated by NULL
1122 * dev->sdev, this function doesn't have to do anything.
1123 * Otherwise, SCSI layer initiated warm-unplug is in progress.
1124 * Clear dev->sdev, schedule the device for ATA detach and invoke
1125 * EH.
1126 *
1127 * LOCKING:
1128 * Defined by SCSI layer. We don't really care.
1129 */
1130void ata_scsi_slave_destroy(struct scsi_device *sdev)
1131{
1132 struct ata_port *ap = ata_shost_to_port(sdev->host);
1133 unsigned long flags;
1134 struct ata_device *dev;
1135
1136 if (!ap->ops->error_handler)
1137 return;
1138
1139 spin_lock_irqsave(ap->lock, flags);
1140 dev = __ata_scsi_find_dev(ap, sdev);
1141 if (dev && dev->sdev) {
1142 /* SCSI device already in CANCEL state, no need to offline it */
1143 dev->sdev = NULL;
1144 dev->flags |= ATA_DFLAG_DETACH;
1145 ata_port_schedule_eh(ap);
1146 }
1147 spin_unlock_irqrestore(ap->lock, flags);
1148
1149 kfree(sdev->dma_drain_buf);
1150}
1151EXPORT_SYMBOL_GPL(ata_scsi_slave_destroy);
1152
1153/**
1154 * ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
1155 * @qc: Storage for translated ATA taskfile
1156 *
1157 * Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
1158 * (to start). Perhaps these commands should be preceded by
1159 * CHECK POWER MODE to see what power mode the device is already in.
1160 * [See SAT revision 5 at www.t10.org]
1161 *
1162 * LOCKING:
1163 * spin_lock_irqsave(host lock)
1164 *
1165 * RETURNS:
1166 * Zero on success, non-zero on error.
1167 */
1168static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc)
1169{
1170 struct scsi_cmnd *scmd = qc->scsicmd;
1171 struct ata_taskfile *tf = &qc->tf;
1172 const u8 *cdb = scmd->cmnd;
1173 u16 fp;
1174 u8 bp = 0xff;
1175
1176 if (scmd->cmd_len < 5) {
1177 fp = 4;
1178 goto invalid_fld;
1179 }
1180
1181 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
1182 tf->protocol = ATA_PROT_NODATA;
1183 if (cdb[1] & 0x1) {
1184 ; /* ignore IMMED bit, violates sat-r05 */
1185 }
1186 if (cdb[4] & 0x2) {
1187 fp = 4;
1188 bp = 1;
1189 goto invalid_fld; /* LOEJ bit set not supported */
1190 }
1191 if (((cdb[4] >> 4) & 0xf) != 0) {
1192 fp = 4;
1193 bp = 3;
1194 goto invalid_fld; /* power conditions not supported */
1195 }
1196
1197 if (cdb[4] & 0x1) {
1198 tf->nsect = 1; /* 1 sector, lba=0 */
1199
1200 if (qc->dev->flags & ATA_DFLAG_LBA) {
1201 tf->flags |= ATA_TFLAG_LBA;
1202
1203 tf->lbah = 0x0;
1204 tf->lbam = 0x0;
1205 tf->lbal = 0x0;
1206 tf->device |= ATA_LBA;
1207 } else {
1208 /* CHS */
1209 tf->lbal = 0x1; /* sect */
1210 tf->lbam = 0x0; /* cyl low */
1211 tf->lbah = 0x0; /* cyl high */
1212 }
1213
1214 tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
1215 } else {
1216 /* Some odd clown BIOSen issue spindown on power off (ACPI S4
1217 * or S5) causing some drives to spin up and down again.
1218 */
1219 if ((qc->ap->flags & ATA_FLAG_NO_POWEROFF_SPINDOWN) &&
1220 system_state == SYSTEM_POWER_OFF)
1221 goto skip;
1222
1223 if ((qc->ap->flags & ATA_FLAG_NO_HIBERNATE_SPINDOWN) &&
1224 system_entering_hibernation())
1225 goto skip;
1226
1227 /* Issue ATA STANDBY IMMEDIATE command */
1228 tf->command = ATA_CMD_STANDBYNOW1;
1229 }
1230
1231 /*
1232 * Standby and Idle condition timers could be implemented but that
1233 * would require libata to implement the Power condition mode page
1234 * and allow the user to change it. Changing mode pages requires
1235 * MODE SELECT to be implemented.
1236 */
1237
1238 return 0;
1239
1240 invalid_fld:
1241 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
1242 return 1;
1243 skip:
1244 scmd->result = SAM_STAT_GOOD;
1245 return 1;
1246}
1247
1248
1249/**
1250 * ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
1251 * @qc: Storage for translated ATA taskfile
1252 *
1253 * Sets up an ATA taskfile to issue FLUSH CACHE or
1254 * FLUSH CACHE EXT.
1255 *
1256 * LOCKING:
1257 * spin_lock_irqsave(host lock)
1258 *
1259 * RETURNS:
1260 * Zero on success, non-zero on error.
1261 */
1262static unsigned int ata_scsi_flush_xlat(struct ata_queued_cmd *qc)
1263{
1264 struct ata_taskfile *tf = &qc->tf;
1265
1266 tf->flags |= ATA_TFLAG_DEVICE;
1267 tf->protocol = ATA_PROT_NODATA;
1268
1269 if (qc->dev->flags & ATA_DFLAG_FLUSH_EXT)
1270 tf->command = ATA_CMD_FLUSH_EXT;
1271 else
1272 tf->command = ATA_CMD_FLUSH;
1273
1274 /* flush is critical for IO integrity, consider it an IO command */
1275 qc->flags |= ATA_QCFLAG_IO;
1276
1277 return 0;
1278}
1279
1280/**
1281 * scsi_6_lba_len - Get LBA and transfer length
1282 * @cdb: SCSI command to translate
1283 *
1284 * Calculate LBA and transfer length for 6-byte commands.
1285 *
1286 * RETURNS:
1287 * @plba: the LBA
1288 * @plen: the transfer length
1289 */
1290static void scsi_6_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1291{
1292 u64 lba = 0;
1293 u32 len;
1294
1295 VPRINTK("six-byte command\n");
1296
1297 lba |= ((u64)(cdb[1] & 0x1f)) << 16;
1298 lba |= ((u64)cdb[2]) << 8;
1299 lba |= ((u64)cdb[3]);
1300
1301 len = cdb[4];
1302
1303 *plba = lba;
1304 *plen = len;
1305}
1306
1307/**
1308 * scsi_10_lba_len - Get LBA and transfer length
1309 * @cdb: SCSI command to translate
1310 *
1311 * Calculate LBA and transfer length for 10-byte commands.
1312 *
1313 * RETURNS:
1314 * @plba: the LBA
1315 * @plen: the transfer length
1316 */
1317static void scsi_10_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1318{
1319 u64 lba = 0;
1320 u32 len = 0;
1321
1322 VPRINTK("ten-byte command\n");
1323
1324 lba |= ((u64)cdb[2]) << 24;
1325 lba |= ((u64)cdb[3]) << 16;
1326 lba |= ((u64)cdb[4]) << 8;
1327 lba |= ((u64)cdb[5]);
1328
1329 len |= ((u32)cdb[7]) << 8;
1330 len |= ((u32)cdb[8]);
1331
1332 *plba = lba;
1333 *plen = len;
1334}
1335
1336/**
1337 * scsi_16_lba_len - Get LBA and transfer length
1338 * @cdb: SCSI command to translate
1339 *
1340 * Calculate LBA and transfer length for 16-byte commands.
1341 *
1342 * RETURNS:
1343 * @plba: the LBA
1344 * @plen: the transfer length
1345 */
1346static void scsi_16_lba_len(const u8 *cdb, u64 *plba, u32 *plen)
1347{
1348 u64 lba = 0;
1349 u32 len = 0;
1350
1351 VPRINTK("sixteen-byte command\n");
1352
1353 lba |= ((u64)cdb[2]) << 56;
1354 lba |= ((u64)cdb[3]) << 48;
1355 lba |= ((u64)cdb[4]) << 40;
1356 lba |= ((u64)cdb[5]) << 32;
1357 lba |= ((u64)cdb[6]) << 24;
1358 lba |= ((u64)cdb[7]) << 16;
1359 lba |= ((u64)cdb[8]) << 8;
1360 lba |= ((u64)cdb[9]);
1361
1362 len |= ((u32)cdb[10]) << 24;
1363 len |= ((u32)cdb[11]) << 16;
1364 len |= ((u32)cdb[12]) << 8;
1365 len |= ((u32)cdb[13]);
1366
1367 *plba = lba;
1368 *plen = len;
1369}
1370
1371/**
1372 * ata_scsi_verify_xlat - Translate SCSI VERIFY command into an ATA one
1373 * @qc: Storage for translated ATA taskfile
1374 *
1375 * Converts SCSI VERIFY command to an ATA READ VERIFY command.
1376 *
1377 * LOCKING:
1378 * spin_lock_irqsave(host lock)
1379 *
1380 * RETURNS:
1381 * Zero on success, non-zero on error.
1382 */
1383static unsigned int ata_scsi_verify_xlat(struct ata_queued_cmd *qc)
1384{
1385 struct scsi_cmnd *scmd = qc->scsicmd;
1386 struct ata_taskfile *tf = &qc->tf;
1387 struct ata_device *dev = qc->dev;
1388 u64 dev_sectors = qc->dev->n_sectors;
1389 const u8 *cdb = scmd->cmnd;
1390 u64 block;
1391 u32 n_block;
1392 u16 fp;
1393
1394 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
1395 tf->protocol = ATA_PROT_NODATA;
1396
1397 if (cdb[0] == VERIFY) {
1398 if (scmd->cmd_len < 10) {
1399 fp = 9;
1400 goto invalid_fld;
1401 }
1402 scsi_10_lba_len(cdb, &block, &n_block);
1403 } else if (cdb[0] == VERIFY_16) {
1404 if (scmd->cmd_len < 16) {
1405 fp = 15;
1406 goto invalid_fld;
1407 }
1408 scsi_16_lba_len(cdb, &block, &n_block);
1409 } else {
1410 fp = 0;
1411 goto invalid_fld;
1412 }
1413
1414 if (!n_block)
1415 goto nothing_to_do;
1416 if (block >= dev_sectors)
1417 goto out_of_range;
1418 if ((block + n_block) > dev_sectors)
1419 goto out_of_range;
1420
1421 if (dev->flags & ATA_DFLAG_LBA) {
1422 tf->flags |= ATA_TFLAG_LBA;
1423
1424 if (lba_28_ok(block, n_block)) {
1425 /* use LBA28 */
1426 tf->command = ATA_CMD_VERIFY;
1427 tf->device |= (block >> 24) & 0xf;
1428 } else if (lba_48_ok(block, n_block)) {
1429 if (!(dev->flags & ATA_DFLAG_LBA48))
1430 goto out_of_range;
1431
1432 /* use LBA48 */
1433 tf->flags |= ATA_TFLAG_LBA48;
1434 tf->command = ATA_CMD_VERIFY_EXT;
1435
1436 tf->hob_nsect = (n_block >> 8) & 0xff;
1437
1438 tf->hob_lbah = (block >> 40) & 0xff;
1439 tf->hob_lbam = (block >> 32) & 0xff;
1440 tf->hob_lbal = (block >> 24) & 0xff;
1441 } else
1442 /* request too large even for LBA48 */
1443 goto out_of_range;
1444
1445 tf->nsect = n_block & 0xff;
1446
1447 tf->lbah = (block >> 16) & 0xff;
1448 tf->lbam = (block >> 8) & 0xff;
1449 tf->lbal = block & 0xff;
1450
1451 tf->device |= ATA_LBA;
1452 } else {
1453 /* CHS */
1454 u32 sect, head, cyl, track;
1455
1456 if (!lba_28_ok(block, n_block))
1457 goto out_of_range;
1458
1459 /* Convert LBA to CHS */
1460 track = (u32)block / dev->sectors;
1461 cyl = track / dev->heads;
1462 head = track % dev->heads;
1463 sect = (u32)block % dev->sectors + 1;
1464
1465 DPRINTK("block %u track %u cyl %u head %u sect %u\n",
1466 (u32)block, track, cyl, head, sect);
1467
1468 /* Check whether the converted CHS can fit.
1469 Cylinder: 0-65535
1470 Head: 0-15
1471 Sector: 1-255*/
1472 if ((cyl >> 16) || (head >> 4) || (sect >> 8) || (!sect))
1473 goto out_of_range;
1474
1475 tf->command = ATA_CMD_VERIFY;
1476 tf->nsect = n_block & 0xff; /* Sector count 0 means 256 sectors */
1477 tf->lbal = sect;
1478 tf->lbam = cyl;
1479 tf->lbah = cyl >> 8;
1480 tf->device |= head;
1481 }
1482
1483 return 0;
1484
1485invalid_fld:
1486 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1487 return 1;
1488
1489out_of_range:
1490 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1491 /* "Logical Block Address out of range" */
1492 return 1;
1493
1494nothing_to_do:
1495 scmd->result = SAM_STAT_GOOD;
1496 return 1;
1497}
1498
1499static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks)
1500{
1501 struct request *rq = scmd->request;
1502 u32 req_blocks;
1503
1504 if (!blk_rq_is_passthrough(rq))
1505 return true;
1506
1507 req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size;
1508 if (n_blocks > req_blocks)
1509 return false;
1510
1511 return true;
1512}
1513
1514/**
1515 * ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
1516 * @qc: Storage for translated ATA taskfile
1517 *
1518 * Converts any of six SCSI read/write commands into the
1519 * ATA counterpart, including starting sector (LBA),
1520 * sector count, and taking into account the device's LBA48
1521 * support.
1522 *
1523 * Commands %READ_6, %READ_10, %READ_16, %WRITE_6, %WRITE_10, and
1524 * %WRITE_16 are currently supported.
1525 *
1526 * LOCKING:
1527 * spin_lock_irqsave(host lock)
1528 *
1529 * RETURNS:
1530 * Zero on success, non-zero on error.
1531 */
1532static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
1533{
1534 struct scsi_cmnd *scmd = qc->scsicmd;
1535 const u8 *cdb = scmd->cmnd;
1536 struct request *rq = scmd->request;
1537 int class = IOPRIO_PRIO_CLASS(req_get_ioprio(rq));
1538 unsigned int tf_flags = 0;
1539 u64 block;
1540 u32 n_block;
1541 int rc;
1542 u16 fp = 0;
1543
1544 if (cdb[0] == WRITE_10 || cdb[0] == WRITE_6 || cdb[0] == WRITE_16)
1545 tf_flags |= ATA_TFLAG_WRITE;
1546
1547 /* Calculate the SCSI LBA, transfer length and FUA. */
1548 switch (cdb[0]) {
1549 case READ_10:
1550 case WRITE_10:
1551 if (unlikely(scmd->cmd_len < 10)) {
1552 fp = 9;
1553 goto invalid_fld;
1554 }
1555 scsi_10_lba_len(cdb, &block, &n_block);
1556 if (cdb[1] & (1 << 3))
1557 tf_flags |= ATA_TFLAG_FUA;
1558 if (!ata_check_nblocks(scmd, n_block))
1559 goto invalid_fld;
1560 break;
1561 case READ_6:
1562 case WRITE_6:
1563 if (unlikely(scmd->cmd_len < 6)) {
1564 fp = 5;
1565 goto invalid_fld;
1566 }
1567 scsi_6_lba_len(cdb, &block, &n_block);
1568
1569 /* for 6-byte r/w commands, transfer length 0
1570 * means 256 blocks of data, not 0 block.
1571 */
1572 if (!n_block)
1573 n_block = 256;
1574 if (!ata_check_nblocks(scmd, n_block))
1575 goto invalid_fld;
1576 break;
1577 case READ_16:
1578 case WRITE_16:
1579 if (unlikely(scmd->cmd_len < 16)) {
1580 fp = 15;
1581 goto invalid_fld;
1582 }
1583 scsi_16_lba_len(cdb, &block, &n_block);
1584 if (cdb[1] & (1 << 3))
1585 tf_flags |= ATA_TFLAG_FUA;
1586 if (!ata_check_nblocks(scmd, n_block))
1587 goto invalid_fld;
1588 break;
1589 default:
1590 DPRINTK("no-byte command\n");
1591 fp = 0;
1592 goto invalid_fld;
1593 }
1594
1595 /* Check and compose ATA command */
1596 if (!n_block)
1597 /* For 10-byte and 16-byte SCSI R/W commands, transfer
1598 * length 0 means transfer 0 block of data.
1599 * However, for ATA R/W commands, sector count 0 means
1600 * 256 or 65536 sectors, not 0 sectors as in SCSI.
1601 *
1602 * WARNING: one or two older ATA drives treat 0 as 0...
1603 */
1604 goto nothing_to_do;
1605
1606 qc->flags |= ATA_QCFLAG_IO;
1607 qc->nbytes = n_block * scmd->device->sector_size;
1608
1609 rc = ata_build_rw_tf(&qc->tf, qc->dev, block, n_block, tf_flags,
1610 qc->hw_tag, class);
1611
1612 if (likely(rc == 0))
1613 return 0;
1614
1615 if (rc == -ERANGE)
1616 goto out_of_range;
1617 /* treat all other errors as -EINVAL, fall through */
1618invalid_fld:
1619 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
1620 return 1;
1621
1622out_of_range:
1623 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x21, 0x0);
1624 /* "Logical Block Address out of range" */
1625 return 1;
1626
1627nothing_to_do:
1628 scmd->result = SAM_STAT_GOOD;
1629 return 1;
1630}
1631
1632static void ata_qc_done(struct ata_queued_cmd *qc)
1633{
1634 struct scsi_cmnd *cmd = qc->scsicmd;
1635 void (*done)(struct scsi_cmnd *) = qc->scsidone;
1636
1637 ata_qc_free(qc);
1638 done(cmd);
1639}
1640
1641static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
1642{
1643 struct ata_port *ap = qc->ap;
1644 struct scsi_cmnd *cmd = qc->scsicmd;
1645 u8 *cdb = cmd->cmnd;
1646 int need_sense = (qc->err_mask != 0);
1647
1648 /* For ATA pass thru (SAT) commands, generate a sense block if
1649 * user mandated it or if there's an error. Note that if we
1650 * generate because the user forced us to [CK_COND =1], a check
1651 * condition is generated and the ATA register values are returned
1652 * whether the command completed successfully or not. If there
1653 * was no error, we use the following sense data:
1654 * sk = RECOVERED ERROR
1655 * asc,ascq = ATA PASS-THROUGH INFORMATION AVAILABLE
1656 */
1657 if (((cdb[0] == ATA_16) || (cdb[0] == ATA_12)) &&
1658 ((cdb[2] & 0x20) || need_sense))
1659 ata_gen_passthru_sense(qc);
1660 else if (qc->flags & ATA_QCFLAG_SENSE_VALID)
1661 cmd->result = SAM_STAT_CHECK_CONDITION;
1662 else if (need_sense)
1663 ata_gen_ata_sense(qc);
1664 else
1665 cmd->result = SAM_STAT_GOOD;
1666
1667 if (need_sense && !ap->ops->error_handler)
1668 ata_dump_status(ap->print_id, &qc->result_tf);
1669
1670 ata_qc_done(qc);
1671}
1672
1673/**
1674 * ata_scsi_translate - Translate then issue SCSI command to ATA device
1675 * @dev: ATA device to which the command is addressed
1676 * @cmd: SCSI command to execute
1677 * @xlat_func: Actor which translates @cmd to an ATA taskfile
1678 *
1679 * Our ->queuecommand() function has decided that the SCSI
1680 * command issued can be directly translated into an ATA
1681 * command, rather than handled internally.
1682 *
1683 * This function sets up an ata_queued_cmd structure for the
1684 * SCSI command, and sends that ata_queued_cmd to the hardware.
1685 *
1686 * The xlat_func argument (actor) returns 0 if ready to execute
1687 * ATA command, else 1 to finish translation. If 1 is returned
1688 * then cmd->result (and possibly cmd->sense_buffer) are assumed
1689 * to be set reflecting an error condition or clean (early)
1690 * termination.
1691 *
1692 * LOCKING:
1693 * spin_lock_irqsave(host lock)
1694 *
1695 * RETURNS:
1696 * 0 on success, SCSI_ML_QUEUE_DEVICE_BUSY if the command
1697 * needs to be deferred.
1698 */
1699static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
1700 ata_xlat_func_t xlat_func)
1701{
1702 struct ata_port *ap = dev->link->ap;
1703 struct ata_queued_cmd *qc;
1704 int rc;
1705
1706 VPRINTK("ENTER\n");
1707
1708 qc = ata_scsi_qc_new(dev, cmd);
1709 if (!qc)
1710 goto err_mem;
1711
1712 /* data is present; dma-map it */
1713 if (cmd->sc_data_direction == DMA_FROM_DEVICE ||
1714 cmd->sc_data_direction == DMA_TO_DEVICE) {
1715 if (unlikely(scsi_bufflen(cmd) < 1)) {
1716 ata_dev_warn(dev, "WARNING: zero len r/w req\n");
1717 goto err_did;
1718 }
1719
1720 ata_sg_init(qc, scsi_sglist(cmd), scsi_sg_count(cmd));
1721
1722 qc->dma_dir = cmd->sc_data_direction;
1723 }
1724
1725 qc->complete_fn = ata_scsi_qc_complete;
1726
1727 if (xlat_func(qc))
1728 goto early_finish;
1729
1730 if (ap->ops->qc_defer) {
1731 if ((rc = ap->ops->qc_defer(qc)))
1732 goto defer;
1733 }
1734
1735 /* select device, send command to hardware */
1736 ata_qc_issue(qc);
1737
1738 VPRINTK("EXIT\n");
1739 return 0;
1740
1741early_finish:
1742 ata_qc_free(qc);
1743 cmd->scsi_done(cmd);
1744 DPRINTK("EXIT - early finish (good or error)\n");
1745 return 0;
1746
1747err_did:
1748 ata_qc_free(qc);
1749 cmd->result = (DID_ERROR << 16);
1750 cmd->scsi_done(cmd);
1751err_mem:
1752 DPRINTK("EXIT - internal\n");
1753 return 0;
1754
1755defer:
1756 ata_qc_free(qc);
1757 DPRINTK("EXIT - defer\n");
1758 if (rc == ATA_DEFER_LINK)
1759 return SCSI_MLQUEUE_DEVICE_BUSY;
1760 else
1761 return SCSI_MLQUEUE_HOST_BUSY;
1762}
1763
1764struct ata_scsi_args {
1765 struct ata_device *dev;
1766 u16 *id;
1767 struct scsi_cmnd *cmd;
1768};
1769
1770/**
1771 * ata_scsi_rbuf_get - Map response buffer.
1772 * @cmd: SCSI command containing buffer to be mapped.
1773 * @flags: unsigned long variable to store irq enable status
1774 * @copy_in: copy in from user buffer
1775 *
1776 * Prepare buffer for simulated SCSI commands.
1777 *
1778 * LOCKING:
1779 * spin_lock_irqsave(ata_scsi_rbuf_lock) on success
1780 *
1781 * RETURNS:
1782 * Pointer to response buffer.
1783 */
1784static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
1785 unsigned long *flags)
1786{
1787 spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
1788
1789 memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
1790 if (copy_in)
1791 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1792 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1793 return ata_scsi_rbuf;
1794}
1795
1796/**
1797 * ata_scsi_rbuf_put - Unmap response buffer.
1798 * @cmd: SCSI command containing buffer to be unmapped.
1799 * @copy_out: copy out result
1800 * @flags: @flags passed to ata_scsi_rbuf_get()
1801 *
1802 * Returns rbuf buffer. The result is copied to @cmd's buffer if
1803 * @copy_back is true.
1804 *
1805 * LOCKING:
1806 * Unlocks ata_scsi_rbuf_lock.
1807 */
1808static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
1809 unsigned long *flags)
1810{
1811 if (copy_out)
1812 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
1813 ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
1814 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
1815}
1816
1817/**
1818 * ata_scsi_rbuf_fill - wrapper for SCSI command simulators
1819 * @args: device IDENTIFY data / SCSI command of interest.
1820 * @actor: Callback hook for desired SCSI command simulator
1821 *
1822 * Takes care of the hard work of simulating a SCSI command...
1823 * Mapping the response buffer, calling the command's handler,
1824 * and handling the handler's return value. This return value
1825 * indicates whether the handler wishes the SCSI command to be
1826 * completed successfully (0), or not (in which case cmd->result
1827 * and sense buffer are assumed to be set).
1828 *
1829 * LOCKING:
1830 * spin_lock_irqsave(host lock)
1831 */
1832static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
1833 unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
1834{
1835 u8 *rbuf;
1836 unsigned int rc;
1837 struct scsi_cmnd *cmd = args->cmd;
1838 unsigned long flags;
1839
1840 rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
1841 rc = actor(args, rbuf);
1842 ata_scsi_rbuf_put(cmd, rc == 0, &flags);
1843
1844 if (rc == 0)
1845 cmd->result = SAM_STAT_GOOD;
1846}
1847
1848/**
1849 * ata_scsiop_inq_std - Simulate INQUIRY command
1850 * @args: device IDENTIFY data / SCSI command of interest.
1851 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1852 *
1853 * Returns standard device identification data associated
1854 * with non-VPD INQUIRY command output.
1855 *
1856 * LOCKING:
1857 * spin_lock_irqsave(host lock)
1858 */
1859static unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf)
1860{
1861 static const u8 versions[] = {
1862 0x00,
1863 0x60, /* SAM-3 (no version claimed) */
1864
1865 0x03,
1866 0x20, /* SBC-2 (no version claimed) */
1867
1868 0x03,
1869 0x00 /* SPC-3 (no version claimed) */
1870 };
1871 static const u8 versions_zbc[] = {
1872 0x00,
1873 0xA0, /* SAM-5 (no version claimed) */
1874
1875 0x06,
1876 0x00, /* SBC-4 (no version claimed) */
1877
1878 0x05,
1879 0xC0, /* SPC-5 (no version claimed) */
1880
1881 0x60,
1882 0x24, /* ZBC r05 */
1883 };
1884
1885 u8 hdr[] = {
1886 TYPE_DISK,
1887 0,
1888 0x5, /* claim SPC-3 version compatibility */
1889 2,
1890 95 - 4,
1891 0,
1892 0,
1893 2
1894 };
1895
1896 VPRINTK("ENTER\n");
1897
1898 /* set scsi removable (RMB) bit per ata bit, or if the
1899 * AHCI port says it's external (Hotplug-capable, eSATA).
1900 */
1901 if (ata_id_removable(args->id) ||
1902 (args->dev->link->ap->pflags & ATA_PFLAG_EXTERNAL))
1903 hdr[1] |= (1 << 7);
1904
1905 if (args->dev->class == ATA_DEV_ZAC) {
1906 hdr[0] = TYPE_ZBC;
1907 hdr[2] = 0x7; /* claim SPC-5 version compatibility */
1908 }
1909
1910 memcpy(rbuf, hdr, sizeof(hdr));
1911 memcpy(&rbuf[8], "ATA ", 8);
1912 ata_id_string(args->id, &rbuf[16], ATA_ID_PROD, 16);
1913
1914 /* From SAT, use last 2 words from fw rev unless they are spaces */
1915 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV + 2, 4);
1916 if (strncmp(&rbuf[32], " ", 4) == 0)
1917 ata_id_string(args->id, &rbuf[32], ATA_ID_FW_REV, 4);
1918
1919 if (rbuf[32] == 0 || rbuf[32] == ' ')
1920 memcpy(&rbuf[32], "n/a ", 4);
1921
1922 if (ata_id_zoned_cap(args->id) || args->dev->class == ATA_DEV_ZAC)
1923 memcpy(rbuf + 58, versions_zbc, sizeof(versions_zbc));
1924 else
1925 memcpy(rbuf + 58, versions, sizeof(versions));
1926
1927 return 0;
1928}
1929
1930/**
1931 * ata_scsiop_inq_00 - Simulate INQUIRY VPD page 0, list of pages
1932 * @args: device IDENTIFY data / SCSI command of interest.
1933 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1934 *
1935 * Returns list of inquiry VPD pages available.
1936 *
1937 * LOCKING:
1938 * spin_lock_irqsave(host lock)
1939 */
1940static unsigned int ata_scsiop_inq_00(struct ata_scsi_args *args, u8 *rbuf)
1941{
1942 int num_pages;
1943 static const u8 pages[] = {
1944 0x00, /* page 0x00, this page */
1945 0x80, /* page 0x80, unit serial no page */
1946 0x83, /* page 0x83, device ident page */
1947 0x89, /* page 0x89, ata info page */
1948 0xb0, /* page 0xb0, block limits page */
1949 0xb1, /* page 0xb1, block device characteristics page */
1950 0xb2, /* page 0xb2, thin provisioning page */
1951 0xb6, /* page 0xb6, zoned block device characteristics */
1952 };
1953
1954 num_pages = sizeof(pages);
1955 if (!(args->dev->flags & ATA_DFLAG_ZAC))
1956 num_pages--;
1957 rbuf[3] = num_pages; /* number of supported VPD pages */
1958 memcpy(rbuf + 4, pages, num_pages);
1959 return 0;
1960}
1961
1962/**
1963 * ata_scsiop_inq_80 - Simulate INQUIRY VPD page 80, device serial number
1964 * @args: device IDENTIFY data / SCSI command of interest.
1965 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1966 *
1967 * Returns ATA device serial number.
1968 *
1969 * LOCKING:
1970 * spin_lock_irqsave(host lock)
1971 */
1972static unsigned int ata_scsiop_inq_80(struct ata_scsi_args *args, u8 *rbuf)
1973{
1974 static const u8 hdr[] = {
1975 0,
1976 0x80, /* this page code */
1977 0,
1978 ATA_ID_SERNO_LEN, /* page len */
1979 };
1980
1981 memcpy(rbuf, hdr, sizeof(hdr));
1982 ata_id_string(args->id, (unsigned char *) &rbuf[4],
1983 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
1984 return 0;
1985}
1986
1987/**
1988 * ata_scsiop_inq_83 - Simulate INQUIRY VPD page 83, device identity
1989 * @args: device IDENTIFY data / SCSI command of interest.
1990 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
1991 *
1992 * Yields two logical unit device identification designators:
1993 * - vendor specific ASCII containing the ATA serial number
1994 * - SAT defined "t10 vendor id based" containing ASCII vendor
1995 * name ("ATA "), model and serial numbers.
1996 *
1997 * LOCKING:
1998 * spin_lock_irqsave(host lock)
1999 */
2000static unsigned int ata_scsiop_inq_83(struct ata_scsi_args *args, u8 *rbuf)
2001{
2002 const int sat_model_serial_desc_len = 68;
2003 int num;
2004
2005 rbuf[1] = 0x83; /* this page code */
2006 num = 4;
2007
2008 /* piv=0, assoc=lu, code_set=ACSII, designator=vendor */
2009 rbuf[num + 0] = 2;
2010 rbuf[num + 3] = ATA_ID_SERNO_LEN;
2011 num += 4;
2012 ata_id_string(args->id, (unsigned char *) rbuf + num,
2013 ATA_ID_SERNO, ATA_ID_SERNO_LEN);
2014 num += ATA_ID_SERNO_LEN;
2015
2016 /* SAT defined lu model and serial numbers descriptor */
2017 /* piv=0, assoc=lu, code_set=ACSII, designator=t10 vendor id */
2018 rbuf[num + 0] = 2;
2019 rbuf[num + 1] = 1;
2020 rbuf[num + 3] = sat_model_serial_desc_len;
2021 num += 4;
2022 memcpy(rbuf + num, "ATA ", 8);
2023 num += 8;
2024 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_PROD,
2025 ATA_ID_PROD_LEN);
2026 num += ATA_ID_PROD_LEN;
2027 ata_id_string(args->id, (unsigned char *) rbuf + num, ATA_ID_SERNO,
2028 ATA_ID_SERNO_LEN);
2029 num += ATA_ID_SERNO_LEN;
2030
2031 if (ata_id_has_wwn(args->id)) {
2032 /* SAT defined lu world wide name */
2033 /* piv=0, assoc=lu, code_set=binary, designator=NAA */
2034 rbuf[num + 0] = 1;
2035 rbuf[num + 1] = 3;
2036 rbuf[num + 3] = ATA_ID_WWN_LEN;
2037 num += 4;
2038 ata_id_string(args->id, (unsigned char *) rbuf + num,
2039 ATA_ID_WWN, ATA_ID_WWN_LEN);
2040 num += ATA_ID_WWN_LEN;
2041 }
2042 rbuf[3] = num - 4; /* page len (assume less than 256 bytes) */
2043 return 0;
2044}
2045
2046/**
2047 * ata_scsiop_inq_89 - Simulate INQUIRY VPD page 89, ATA info
2048 * @args: device IDENTIFY data / SCSI command of interest.
2049 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2050 *
2051 * Yields SAT-specified ATA VPD page.
2052 *
2053 * LOCKING:
2054 * spin_lock_irqsave(host lock)
2055 */
2056static unsigned int ata_scsiop_inq_89(struct ata_scsi_args *args, u8 *rbuf)
2057{
2058 rbuf[1] = 0x89; /* our page code */
2059 rbuf[2] = (0x238 >> 8); /* page size fixed at 238h */
2060 rbuf[3] = (0x238 & 0xff);
2061
2062 memcpy(&rbuf[8], "linux ", 8);
2063 memcpy(&rbuf[16], "libata ", 16);
2064 memcpy(&rbuf[32], DRV_VERSION, 4);
2065
2066 rbuf[36] = 0x34; /* force D2H Reg FIS (34h) */
2067 rbuf[37] = (1 << 7); /* bit 7 indicates Command FIS */
2068 /* TODO: PMP? */
2069
2070 /* we don't store the ATA device signature, so we fake it */
2071 rbuf[38] = ATA_DRDY; /* really, this is Status reg */
2072 rbuf[40] = 0x1;
2073 rbuf[48] = 0x1;
2074
2075 rbuf[56] = ATA_CMD_ID_ATA;
2076
2077 memcpy(&rbuf[60], &args->id[0], 512);
2078 return 0;
2079}
2080
2081static unsigned int ata_scsiop_inq_b0(struct ata_scsi_args *args, u8 *rbuf)
2082{
2083 struct ata_device *dev = args->dev;
2084 u16 min_io_sectors;
2085
2086 rbuf[1] = 0xb0;
2087 rbuf[3] = 0x3c; /* required VPD size with unmap support */
2088
2089 /*
2090 * Optimal transfer length granularity.
2091 *
2092 * This is always one physical block, but for disks with a smaller
2093 * logical than physical sector size we need to figure out what the
2094 * latter is.
2095 */
2096 min_io_sectors = 1 << ata_id_log2_per_physical_sector(args->id);
2097 put_unaligned_be16(min_io_sectors, &rbuf[6]);
2098
2099 /*
2100 * Optimal unmap granularity.
2101 *
2102 * The ATA spec doesn't even know about a granularity or alignment
2103 * for the TRIM command. We can leave away most of the unmap related
2104 * VPD page entries, but we have specifify a granularity to signal
2105 * that we support some form of unmap - in thise case via WRITE SAME
2106 * with the unmap bit set.
2107 */
2108 if (ata_id_has_trim(args->id)) {
2109 u64 max_blocks = 65535 * ATA_MAX_TRIM_RNUM;
2110
2111 if (dev->horkage & ATA_HORKAGE_MAX_TRIM_128M)
2112 max_blocks = 128 << (20 - SECTOR_SHIFT);
2113
2114 put_unaligned_be64(max_blocks, &rbuf[36]);
2115 put_unaligned_be32(1, &rbuf[28]);
2116 }
2117
2118 return 0;
2119}
2120
2121static unsigned int ata_scsiop_inq_b1(struct ata_scsi_args *args, u8 *rbuf)
2122{
2123 int form_factor = ata_id_form_factor(args->id);
2124 int media_rotation_rate = ata_id_rotation_rate(args->id);
2125 u8 zoned = ata_id_zoned_cap(args->id);
2126
2127 rbuf[1] = 0xb1;
2128 rbuf[3] = 0x3c;
2129 rbuf[4] = media_rotation_rate >> 8;
2130 rbuf[5] = media_rotation_rate;
2131 rbuf[7] = form_factor;
2132 if (zoned)
2133 rbuf[8] = (zoned << 4);
2134
2135 return 0;
2136}
2137
2138static unsigned int ata_scsiop_inq_b2(struct ata_scsi_args *args, u8 *rbuf)
2139{
2140 /* SCSI Thin Provisioning VPD page: SBC-3 rev 22 or later */
2141 rbuf[1] = 0xb2;
2142 rbuf[3] = 0x4;
2143 rbuf[5] = 1 << 6; /* TPWS */
2144
2145 return 0;
2146}
2147
2148static unsigned int ata_scsiop_inq_b6(struct ata_scsi_args *args, u8 *rbuf)
2149{
2150 /*
2151 * zbc-r05 SCSI Zoned Block device characteristics VPD page
2152 */
2153 rbuf[1] = 0xb6;
2154 rbuf[3] = 0x3C;
2155
2156 /*
2157 * URSWRZ bit is only meaningful for host-managed ZAC drives
2158 */
2159 if (args->dev->zac_zoned_cap & 1)
2160 rbuf[4] |= 1;
2161 put_unaligned_be32(args->dev->zac_zones_optimal_open, &rbuf[8]);
2162 put_unaligned_be32(args->dev->zac_zones_optimal_nonseq, &rbuf[12]);
2163 put_unaligned_be32(args->dev->zac_zones_max_open, &rbuf[16]);
2164
2165 return 0;
2166}
2167
2168/**
2169 * modecpy - Prepare response for MODE SENSE
2170 * @dest: output buffer
2171 * @src: data being copied
2172 * @n: length of mode page
2173 * @changeable: whether changeable parameters are requested
2174 *
2175 * Generate a generic MODE SENSE page for either current or changeable
2176 * parameters.
2177 *
2178 * LOCKING:
2179 * None.
2180 */
2181static void modecpy(u8 *dest, const u8 *src, int n, bool changeable)
2182{
2183 if (changeable) {
2184 memcpy(dest, src, 2);
2185 memset(dest + 2, 0, n - 2);
2186 } else {
2187 memcpy(dest, src, n);
2188 }
2189}
2190
2191/**
2192 * ata_msense_caching - Simulate MODE SENSE caching info page
2193 * @id: device IDENTIFY data
2194 * @buf: output buffer
2195 * @changeable: whether changeable parameters are requested
2196 *
2197 * Generate a caching info page, which conditionally indicates
2198 * write caching to the SCSI layer, depending on device
2199 * capabilities.
2200 *
2201 * LOCKING:
2202 * None.
2203 */
2204static unsigned int ata_msense_caching(u16 *id, u8 *buf, bool changeable)
2205{
2206 modecpy(buf, def_cache_mpage, sizeof(def_cache_mpage), changeable);
2207 if (changeable) {
2208 buf[2] |= (1 << 2); /* ata_mselect_caching() */
2209 } else {
2210 buf[2] |= (ata_id_wcache_enabled(id) << 2); /* write cache enable */
2211 buf[12] |= (!ata_id_rahead_enabled(id) << 5); /* disable read ahead */
2212 }
2213 return sizeof(def_cache_mpage);
2214}
2215
2216/**
2217 * ata_msense_control - Simulate MODE SENSE control mode page
2218 * @dev: ATA device of interest
2219 * @buf: output buffer
2220 * @changeable: whether changeable parameters are requested
2221 *
2222 * Generate a generic MODE SENSE control mode page.
2223 *
2224 * LOCKING:
2225 * None.
2226 */
2227static unsigned int ata_msense_control(struct ata_device *dev, u8 *buf,
2228 bool changeable)
2229{
2230 modecpy(buf, def_control_mpage, sizeof(def_control_mpage), changeable);
2231 if (changeable) {
2232 buf[2] |= (1 << 2); /* ata_mselect_control() */
2233 } else {
2234 bool d_sense = (dev->flags & ATA_DFLAG_D_SENSE);
2235
2236 buf[2] |= (d_sense << 2); /* descriptor format sense data */
2237 }
2238 return sizeof(def_control_mpage);
2239}
2240
2241/**
2242 * ata_msense_rw_recovery - Simulate MODE SENSE r/w error recovery page
2243 * @buf: output buffer
2244 * @changeable: whether changeable parameters are requested
2245 *
2246 * Generate a generic MODE SENSE r/w error recovery page.
2247 *
2248 * LOCKING:
2249 * None.
2250 */
2251static unsigned int ata_msense_rw_recovery(u8 *buf, bool changeable)
2252{
2253 modecpy(buf, def_rw_recovery_mpage, sizeof(def_rw_recovery_mpage),
2254 changeable);
2255 return sizeof(def_rw_recovery_mpage);
2256}
2257
2258/*
2259 * We can turn this into a real blacklist if it's needed, for now just
2260 * blacklist any Maxtor BANC1G10 revision firmware
2261 */
2262static int ata_dev_supports_fua(u16 *id)
2263{
2264 unsigned char model[ATA_ID_PROD_LEN + 1], fw[ATA_ID_FW_REV_LEN + 1];
2265
2266 if (!libata_fua)
2267 return 0;
2268 if (!ata_id_has_fua(id))
2269 return 0;
2270
2271 ata_id_c_string(id, model, ATA_ID_PROD, sizeof(model));
2272 ata_id_c_string(id, fw, ATA_ID_FW_REV, sizeof(fw));
2273
2274 if (strcmp(model, "Maxtor"))
2275 return 1;
2276 if (strcmp(fw, "BANC1G10"))
2277 return 1;
2278
2279 return 0; /* blacklisted */
2280}
2281
2282/**
2283 * ata_scsiop_mode_sense - Simulate MODE SENSE 6, 10 commands
2284 * @args: device IDENTIFY data / SCSI command of interest.
2285 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2286 *
2287 * Simulate MODE SENSE commands. Assume this is invoked for direct
2288 * access devices (e.g. disks) only. There should be no block
2289 * descriptor for other device types.
2290 *
2291 * LOCKING:
2292 * spin_lock_irqsave(host lock)
2293 */
2294static unsigned int ata_scsiop_mode_sense(struct ata_scsi_args *args, u8 *rbuf)
2295{
2296 struct ata_device *dev = args->dev;
2297 u8 *scsicmd = args->cmd->cmnd, *p = rbuf;
2298 static const u8 sat_blk_desc[] = {
2299 0, 0, 0, 0, /* number of blocks: sat unspecified */
2300 0,
2301 0, 0x2, 0x0 /* block length: 512 bytes */
2302 };
2303 u8 pg, spg;
2304 unsigned int ebd, page_control, six_byte;
2305 u8 dpofua, bp = 0xff;
2306 u16 fp;
2307
2308 VPRINTK("ENTER\n");
2309
2310 six_byte = (scsicmd[0] == MODE_SENSE);
2311 ebd = !(scsicmd[1] & 0x8); /* dbd bit inverted == edb */
2312 /*
2313 * LLBA bit in msense(10) ignored (compliant)
2314 */
2315
2316 page_control = scsicmd[2] >> 6;
2317 switch (page_control) {
2318 case 0: /* current */
2319 case 1: /* changeable */
2320 case 2: /* defaults */
2321 break; /* supported */
2322 case 3: /* saved */
2323 goto saving_not_supp;
2324 default:
2325 fp = 2;
2326 bp = 6;
2327 goto invalid_fld;
2328 }
2329
2330 if (six_byte)
2331 p += 4 + (ebd ? 8 : 0);
2332 else
2333 p += 8 + (ebd ? 8 : 0);
2334
2335 pg = scsicmd[2] & 0x3f;
2336 spg = scsicmd[3];
2337 /*
2338 * No mode subpages supported (yet) but asking for _all_
2339 * subpages may be valid
2340 */
2341 if (spg && (spg != ALL_SUB_MPAGES)) {
2342 fp = 3;
2343 goto invalid_fld;
2344 }
2345
2346 switch(pg) {
2347 case RW_RECOVERY_MPAGE:
2348 p += ata_msense_rw_recovery(p, page_control == 1);
2349 break;
2350
2351 case CACHE_MPAGE:
2352 p += ata_msense_caching(args->id, p, page_control == 1);
2353 break;
2354
2355 case CONTROL_MPAGE:
2356 p += ata_msense_control(args->dev, p, page_control == 1);
2357 break;
2358
2359 case ALL_MPAGES:
2360 p += ata_msense_rw_recovery(p, page_control == 1);
2361 p += ata_msense_caching(args->id, p, page_control == 1);
2362 p += ata_msense_control(args->dev, p, page_control == 1);
2363 break;
2364
2365 default: /* invalid page code */
2366 fp = 2;
2367 goto invalid_fld;
2368 }
2369
2370 dpofua = 0;
2371 if (ata_dev_supports_fua(args->id) && (dev->flags & ATA_DFLAG_LBA48) &&
2372 (!(dev->flags & ATA_DFLAG_PIO) || dev->multi_count))
2373 dpofua = 1 << 4;
2374
2375 if (six_byte) {
2376 rbuf[0] = p - rbuf - 1;
2377 rbuf[2] |= dpofua;
2378 if (ebd) {
2379 rbuf[3] = sizeof(sat_blk_desc);
2380 memcpy(rbuf + 4, sat_blk_desc, sizeof(sat_blk_desc));
2381 }
2382 } else {
2383 unsigned int output_len = p - rbuf - 2;
2384
2385 rbuf[0] = output_len >> 8;
2386 rbuf[1] = output_len;
2387 rbuf[3] |= dpofua;
2388 if (ebd) {
2389 rbuf[7] = sizeof(sat_blk_desc);
2390 memcpy(rbuf + 8, sat_blk_desc, sizeof(sat_blk_desc));
2391 }
2392 }
2393 return 0;
2394
2395invalid_fld:
2396 ata_scsi_set_invalid_field(dev, args->cmd, fp, bp);
2397 return 1;
2398
2399saving_not_supp:
2400 ata_scsi_set_sense(dev, args->cmd, ILLEGAL_REQUEST, 0x39, 0x0);
2401 /* "Saving parameters not supported" */
2402 return 1;
2403}
2404
2405/**
2406 * ata_scsiop_read_cap - Simulate READ CAPACITY[ 16] commands
2407 * @args: device IDENTIFY data / SCSI command of interest.
2408 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2409 *
2410 * Simulate READ CAPACITY commands.
2411 *
2412 * LOCKING:
2413 * None.
2414 */
2415static unsigned int ata_scsiop_read_cap(struct ata_scsi_args *args, u8 *rbuf)
2416{
2417 struct ata_device *dev = args->dev;
2418 u64 last_lba = dev->n_sectors - 1; /* LBA of the last block */
2419 u32 sector_size; /* physical sector size in bytes */
2420 u8 log2_per_phys;
2421 u16 lowest_aligned;
2422
2423 sector_size = ata_id_logical_sector_size(dev->id);
2424 log2_per_phys = ata_id_log2_per_physical_sector(dev->id);
2425 lowest_aligned = ata_id_logical_sector_offset(dev->id, log2_per_phys);
2426
2427 VPRINTK("ENTER\n");
2428
2429 if (args->cmd->cmnd[0] == READ_CAPACITY) {
2430 if (last_lba >= 0xffffffffULL)
2431 last_lba = 0xffffffff;
2432
2433 /* sector count, 32-bit */
2434 rbuf[0] = last_lba >> (8 * 3);
2435 rbuf[1] = last_lba >> (8 * 2);
2436 rbuf[2] = last_lba >> (8 * 1);
2437 rbuf[3] = last_lba;
2438
2439 /* sector size */
2440 rbuf[4] = sector_size >> (8 * 3);
2441 rbuf[5] = sector_size >> (8 * 2);
2442 rbuf[6] = sector_size >> (8 * 1);
2443 rbuf[7] = sector_size;
2444 } else {
2445 /* sector count, 64-bit */
2446 rbuf[0] = last_lba >> (8 * 7);
2447 rbuf[1] = last_lba >> (8 * 6);
2448 rbuf[2] = last_lba >> (8 * 5);
2449 rbuf[3] = last_lba >> (8 * 4);
2450 rbuf[4] = last_lba >> (8 * 3);
2451 rbuf[5] = last_lba >> (8 * 2);
2452 rbuf[6] = last_lba >> (8 * 1);
2453 rbuf[7] = last_lba;
2454
2455 /* sector size */
2456 rbuf[ 8] = sector_size >> (8 * 3);
2457 rbuf[ 9] = sector_size >> (8 * 2);
2458 rbuf[10] = sector_size >> (8 * 1);
2459 rbuf[11] = sector_size;
2460
2461 rbuf[12] = 0;
2462 rbuf[13] = log2_per_phys;
2463 rbuf[14] = (lowest_aligned >> 8) & 0x3f;
2464 rbuf[15] = lowest_aligned;
2465
2466 if (ata_id_has_trim(args->id) &&
2467 !(dev->horkage & ATA_HORKAGE_NOTRIM)) {
2468 rbuf[14] |= 0x80; /* LBPME */
2469
2470 if (ata_id_has_zero_after_trim(args->id) &&
2471 dev->horkage & ATA_HORKAGE_ZERO_AFTER_TRIM) {
2472 ata_dev_info(dev, "Enabling discard_zeroes_data\n");
2473 rbuf[14] |= 0x40; /* LBPRZ */
2474 }
2475 }
2476 if (ata_id_zoned_cap(args->id) ||
2477 args->dev->class == ATA_DEV_ZAC)
2478 rbuf[12] = (1 << 4); /* RC_BASIS */
2479 }
2480 return 0;
2481}
2482
2483/**
2484 * ata_scsiop_report_luns - Simulate REPORT LUNS command
2485 * @args: device IDENTIFY data / SCSI command of interest.
2486 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
2487 *
2488 * Simulate REPORT LUNS command.
2489 *
2490 * LOCKING:
2491 * spin_lock_irqsave(host lock)
2492 */
2493static unsigned int ata_scsiop_report_luns(struct ata_scsi_args *args, u8 *rbuf)
2494{
2495 VPRINTK("ENTER\n");
2496 rbuf[3] = 8; /* just one lun, LUN 0, size 8 bytes */
2497
2498 return 0;
2499}
2500
2501static void atapi_sense_complete(struct ata_queued_cmd *qc)
2502{
2503 if (qc->err_mask && ((qc->err_mask & AC_ERR_DEV) == 0)) {
2504 /* FIXME: not quite right; we don't want the
2505 * translation of taskfile registers into
2506 * a sense descriptors, since that's only
2507 * correct for ATA, not ATAPI
2508 */
2509 ata_gen_passthru_sense(qc);
2510 }
2511
2512 ata_qc_done(qc);
2513}
2514
2515/* is it pointless to prefer PIO for "safety reasons"? */
2516static inline int ata_pio_use_silly(struct ata_port *ap)
2517{
2518 return (ap->flags & ATA_FLAG_PIO_DMA);
2519}
2520
2521static void atapi_request_sense(struct ata_queued_cmd *qc)
2522{
2523 struct ata_port *ap = qc->ap;
2524 struct scsi_cmnd *cmd = qc->scsicmd;
2525
2526 DPRINTK("ATAPI request sense\n");
2527
2528 memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2529
2530#ifdef CONFIG_ATA_SFF
2531 if (ap->ops->sff_tf_read)
2532 ap->ops->sff_tf_read(ap, &qc->tf);
2533#endif
2534
2535 /* fill these in, for the case where they are -not- overwritten */
2536 cmd->sense_buffer[0] = 0x70;
2537 cmd->sense_buffer[2] = qc->tf.feature >> 4;
2538
2539 ata_qc_reinit(qc);
2540
2541 /* setup sg table and init transfer direction */
2542 sg_init_one(&qc->sgent, cmd->sense_buffer, SCSI_SENSE_BUFFERSIZE);
2543 ata_sg_init(qc, &qc->sgent, 1);
2544 qc->dma_dir = DMA_FROM_DEVICE;
2545
2546 memset(&qc->cdb, 0, qc->dev->cdb_len);
2547 qc->cdb[0] = REQUEST_SENSE;
2548 qc->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2549
2550 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2551 qc->tf.command = ATA_CMD_PACKET;
2552
2553 if (ata_pio_use_silly(ap)) {
2554 qc->tf.protocol = ATAPI_PROT_DMA;
2555 qc->tf.feature |= ATAPI_PKT_DMA;
2556 } else {
2557 qc->tf.protocol = ATAPI_PROT_PIO;
2558 qc->tf.lbam = SCSI_SENSE_BUFFERSIZE;
2559 qc->tf.lbah = 0;
2560 }
2561 qc->nbytes = SCSI_SENSE_BUFFERSIZE;
2562
2563 qc->complete_fn = atapi_sense_complete;
2564
2565 ata_qc_issue(qc);
2566
2567 DPRINTK("EXIT\n");
2568}
2569
2570/*
2571 * ATAPI devices typically report zero for their SCSI version, and sometimes
2572 * deviate from the spec WRT response data format. If SCSI version is
2573 * reported as zero like normal, then we make the following fixups:
2574 * 1) Fake MMC-5 version, to indicate to the Linux scsi midlayer this is a
2575 * modern device.
2576 * 2) Ensure response data format / ATAPI information are always correct.
2577 */
2578static void atapi_fixup_inquiry(struct scsi_cmnd *cmd)
2579{
2580 u8 buf[4];
2581
2582 sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
2583 if (buf[2] == 0) {
2584 buf[2] = 0x5;
2585 buf[3] = 0x32;
2586 }
2587 sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, 4);
2588}
2589
2590static void atapi_qc_complete(struct ata_queued_cmd *qc)
2591{
2592 struct scsi_cmnd *cmd = qc->scsicmd;
2593 unsigned int err_mask = qc->err_mask;
2594
2595 VPRINTK("ENTER, err_mask 0x%X\n", err_mask);
2596
2597 /* handle completion from new EH */
2598 if (unlikely(qc->ap->ops->error_handler &&
2599 (err_mask || qc->flags & ATA_QCFLAG_SENSE_VALID))) {
2600
2601 if (!(qc->flags & ATA_QCFLAG_SENSE_VALID)) {
2602 /* FIXME: not quite right; we don't want the
2603 * translation of taskfile registers into a
2604 * sense descriptors, since that's only
2605 * correct for ATA, not ATAPI
2606 */
2607 ata_gen_passthru_sense(qc);
2608 }
2609
2610 /* SCSI EH automatically locks door if sdev->locked is
2611 * set. Sometimes door lock request continues to
2612 * fail, for example, when no media is present. This
2613 * creates a loop - SCSI EH issues door lock which
2614 * fails and gets invoked again to acquire sense data
2615 * for the failed command.
2616 *
2617 * If door lock fails, always clear sdev->locked to
2618 * avoid this infinite loop.
2619 *
2620 * This may happen before SCSI scan is complete. Make
2621 * sure qc->dev->sdev isn't NULL before dereferencing.
2622 */
2623 if (qc->cdb[0] == ALLOW_MEDIUM_REMOVAL && qc->dev->sdev)
2624 qc->dev->sdev->locked = 0;
2625
2626 qc->scsicmd->result = SAM_STAT_CHECK_CONDITION;
2627 ata_qc_done(qc);
2628 return;
2629 }
2630
2631 /* successful completion or old EH failure path */
2632 if (unlikely(err_mask & AC_ERR_DEV)) {
2633 cmd->result = SAM_STAT_CHECK_CONDITION;
2634 atapi_request_sense(qc);
2635 return;
2636 } else if (unlikely(err_mask)) {
2637 /* FIXME: not quite right; we don't want the
2638 * translation of taskfile registers into
2639 * a sense descriptors, since that's only
2640 * correct for ATA, not ATAPI
2641 */
2642 ata_gen_passthru_sense(qc);
2643 } else {
2644 if (cmd->cmnd[0] == INQUIRY && (cmd->cmnd[1] & 0x03) == 0)
2645 atapi_fixup_inquiry(cmd);
2646 cmd->result = SAM_STAT_GOOD;
2647 }
2648
2649 ata_qc_done(qc);
2650}
2651/**
2652 * atapi_xlat - Initialize PACKET taskfile
2653 * @qc: command structure to be initialized
2654 *
2655 * LOCKING:
2656 * spin_lock_irqsave(host lock)
2657 *
2658 * RETURNS:
2659 * Zero on success, non-zero on failure.
2660 */
2661static unsigned int atapi_xlat(struct ata_queued_cmd *qc)
2662{
2663 struct scsi_cmnd *scmd = qc->scsicmd;
2664 struct ata_device *dev = qc->dev;
2665 int nodata = (scmd->sc_data_direction == DMA_NONE);
2666 int using_pio = !nodata && (dev->flags & ATA_DFLAG_PIO);
2667 unsigned int nbytes;
2668
2669 memset(qc->cdb, 0, dev->cdb_len);
2670 memcpy(qc->cdb, scmd->cmnd, scmd->cmd_len);
2671
2672 qc->complete_fn = atapi_qc_complete;
2673
2674 qc->tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
2675 if (scmd->sc_data_direction == DMA_TO_DEVICE) {
2676 qc->tf.flags |= ATA_TFLAG_WRITE;
2677 DPRINTK("direction: write\n");
2678 }
2679
2680 qc->tf.command = ATA_CMD_PACKET;
2681 ata_qc_set_pc_nbytes(qc);
2682
2683 /* check whether ATAPI DMA is safe */
2684 if (!nodata && !using_pio && atapi_check_dma(qc))
2685 using_pio = 1;
2686
2687 /* Some controller variants snoop this value for Packet
2688 * transfers to do state machine and FIFO management. Thus we
2689 * want to set it properly, and for DMA where it is
2690 * effectively meaningless.
2691 */
2692 nbytes = min(ata_qc_raw_nbytes(qc), (unsigned int)63 * 1024);
2693
2694 /* Most ATAPI devices which honor transfer chunk size don't
2695 * behave according to the spec when odd chunk size which
2696 * matches the transfer length is specified. If the number of
2697 * bytes to transfer is 2n+1. According to the spec, what
2698 * should happen is to indicate that 2n+1 is going to be
2699 * transferred and transfer 2n+2 bytes where the last byte is
2700 * padding.
2701 *
2702 * In practice, this doesn't happen. ATAPI devices first
2703 * indicate and transfer 2n bytes and then indicate and
2704 * transfer 2 bytes where the last byte is padding.
2705 *
2706 * This inconsistency confuses several controllers which
2707 * perform PIO using DMA such as Intel AHCIs and sil3124/32.
2708 * These controllers use actual number of transferred bytes to
2709 * update DMA pointer and transfer of 4n+2 bytes make those
2710 * controller push DMA pointer by 4n+4 bytes because SATA data
2711 * FISes are aligned to 4 bytes. This causes data corruption
2712 * and buffer overrun.
2713 *
2714 * Always setting nbytes to even number solves this problem
2715 * because then ATAPI devices don't have to split data at 2n
2716 * boundaries.
2717 */
2718 if (nbytes & 0x1)
2719 nbytes++;
2720
2721 qc->tf.lbam = (nbytes & 0xFF);
2722 qc->tf.lbah = (nbytes >> 8);
2723
2724 if (nodata)
2725 qc->tf.protocol = ATAPI_PROT_NODATA;
2726 else if (using_pio)
2727 qc->tf.protocol = ATAPI_PROT_PIO;
2728 else {
2729 /* DMA data xfer */
2730 qc->tf.protocol = ATAPI_PROT_DMA;
2731 qc->tf.feature |= ATAPI_PKT_DMA;
2732
2733 if ((dev->flags & ATA_DFLAG_DMADIR) &&
2734 (scmd->sc_data_direction != DMA_TO_DEVICE))
2735 /* some SATA bridges need us to indicate data xfer direction */
2736 qc->tf.feature |= ATAPI_DMADIR;
2737 }
2738
2739
2740 /* FIXME: We need to translate 0x05 READ_BLOCK_LIMITS to a MODE_SENSE
2741 as ATAPI tape drives don't get this right otherwise */
2742 return 0;
2743}
2744
2745static struct ata_device *ata_find_dev(struct ata_port *ap, int devno)
2746{
2747 if (!sata_pmp_attached(ap)) {
2748 if (likely(devno >= 0 &&
2749 devno < ata_link_max_devices(&ap->link)))
2750 return &ap->link.device[devno];
2751 } else {
2752 if (likely(devno >= 0 &&
2753 devno < ap->nr_pmp_links))
2754 return &ap->pmp_link[devno].device[0];
2755 }
2756
2757 return NULL;
2758}
2759
2760static struct ata_device *__ata_scsi_find_dev(struct ata_port *ap,
2761 const struct scsi_device *scsidev)
2762{
2763 int devno;
2764
2765 /* skip commands not addressed to targets we simulate */
2766 if (!sata_pmp_attached(ap)) {
2767 if (unlikely(scsidev->channel || scsidev->lun))
2768 return NULL;
2769 devno = scsidev->id;
2770 } else {
2771 if (unlikely(scsidev->id || scsidev->lun))
2772 return NULL;
2773 devno = scsidev->channel;
2774 }
2775
2776 return ata_find_dev(ap, devno);
2777}
2778
2779/**
2780 * ata_scsi_find_dev - lookup ata_device from scsi_cmnd
2781 * @ap: ATA port to which the device is attached
2782 * @scsidev: SCSI device from which we derive the ATA device
2783 *
2784 * Given various information provided in struct scsi_cmnd,
2785 * map that onto an ATA bus, and using that mapping
2786 * determine which ata_device is associated with the
2787 * SCSI command to be sent.
2788 *
2789 * LOCKING:
2790 * spin_lock_irqsave(host lock)
2791 *
2792 * RETURNS:
2793 * Associated ATA device, or %NULL if not found.
2794 */
2795struct ata_device *
2796ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev)
2797{
2798 struct ata_device *dev = __ata_scsi_find_dev(ap, scsidev);
2799
2800 if (unlikely(!dev || !ata_dev_enabled(dev)))
2801 return NULL;
2802
2803 return dev;
2804}
2805
2806/*
2807 * ata_scsi_map_proto - Map pass-thru protocol value to taskfile value.
2808 * @byte1: Byte 1 from pass-thru CDB.
2809 *
2810 * RETURNS:
2811 * ATA_PROT_UNKNOWN if mapping failed/unimplemented, protocol otherwise.
2812 */
2813static u8
2814ata_scsi_map_proto(u8 byte1)
2815{
2816 switch((byte1 & 0x1e) >> 1) {
2817 case 3: /* Non-data */
2818 return ATA_PROT_NODATA;
2819
2820 case 6: /* DMA */
2821 case 10: /* UDMA Data-in */
2822 case 11: /* UDMA Data-Out */
2823 return ATA_PROT_DMA;
2824
2825 case 4: /* PIO Data-in */
2826 case 5: /* PIO Data-out */
2827 return ATA_PROT_PIO;
2828
2829 case 12: /* FPDMA */
2830 return ATA_PROT_NCQ;
2831
2832 case 0: /* Hard Reset */
2833 case 1: /* SRST */
2834 case 8: /* Device Diagnostic */
2835 case 9: /* Device Reset */
2836 case 7: /* DMA Queued */
2837 case 15: /* Return Response Info */
2838 default: /* Reserved */
2839 break;
2840 }
2841
2842 return ATA_PROT_UNKNOWN;
2843}
2844
2845/**
2846 * ata_scsi_pass_thru - convert ATA pass-thru CDB to taskfile
2847 * @qc: command structure to be initialized
2848 *
2849 * Handles either 12, 16, or 32-byte versions of the CDB.
2850 *
2851 * RETURNS:
2852 * Zero on success, non-zero on failure.
2853 */
2854static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
2855{
2856 struct ata_taskfile *tf = &(qc->tf);
2857 struct scsi_cmnd *scmd = qc->scsicmd;
2858 struct ata_device *dev = qc->dev;
2859 const u8 *cdb = scmd->cmnd;
2860 u16 fp;
2861 u16 cdb_offset = 0;
2862
2863 /* 7Fh variable length cmd means a ata pass-thru(32) */
2864 if (cdb[0] == VARIABLE_LENGTH_CMD)
2865 cdb_offset = 9;
2866
2867 tf->protocol = ata_scsi_map_proto(cdb[1 + cdb_offset]);
2868 if (tf->protocol == ATA_PROT_UNKNOWN) {
2869 fp = 1;
2870 goto invalid_fld;
2871 }
2872
2873 if (ata_is_ncq(tf->protocol) && (cdb[2 + cdb_offset] & 0x3) == 0)
2874 tf->protocol = ATA_PROT_NCQ_NODATA;
2875
2876 /* enable LBA */
2877 tf->flags |= ATA_TFLAG_LBA;
2878
2879 /*
2880 * 12 and 16 byte CDBs use different offsets to
2881 * provide the various register values.
2882 */
2883 if (cdb[0] == ATA_16) {
2884 /*
2885 * 16-byte CDB - may contain extended commands.
2886 *
2887 * If that is the case, copy the upper byte register values.
2888 */
2889 if (cdb[1] & 0x01) {
2890 tf->hob_feature = cdb[3];
2891 tf->hob_nsect = cdb[5];
2892 tf->hob_lbal = cdb[7];
2893 tf->hob_lbam = cdb[9];
2894 tf->hob_lbah = cdb[11];
2895 tf->flags |= ATA_TFLAG_LBA48;
2896 } else
2897 tf->flags &= ~ATA_TFLAG_LBA48;
2898
2899 /*
2900 * Always copy low byte, device and command registers.
2901 */
2902 tf->feature = cdb[4];
2903 tf->nsect = cdb[6];
2904 tf->lbal = cdb[8];
2905 tf->lbam = cdb[10];
2906 tf->lbah = cdb[12];
2907 tf->device = cdb[13];
2908 tf->command = cdb[14];
2909 } else if (cdb[0] == ATA_12) {
2910 /*
2911 * 12-byte CDB - incapable of extended commands.
2912 */
2913 tf->flags &= ~ATA_TFLAG_LBA48;
2914
2915 tf->feature = cdb[3];
2916 tf->nsect = cdb[4];
2917 tf->lbal = cdb[5];
2918 tf->lbam = cdb[6];
2919 tf->lbah = cdb[7];
2920 tf->device = cdb[8];
2921 tf->command = cdb[9];
2922 } else {
2923 /*
2924 * 32-byte CDB - may contain extended command fields.
2925 *
2926 * If that is the case, copy the upper byte register values.
2927 */
2928 if (cdb[10] & 0x01) {
2929 tf->hob_feature = cdb[20];
2930 tf->hob_nsect = cdb[22];
2931 tf->hob_lbal = cdb[16];
2932 tf->hob_lbam = cdb[15];
2933 tf->hob_lbah = cdb[14];
2934 tf->flags |= ATA_TFLAG_LBA48;
2935 } else
2936 tf->flags &= ~ATA_TFLAG_LBA48;
2937
2938 tf->feature = cdb[21];
2939 tf->nsect = cdb[23];
2940 tf->lbal = cdb[19];
2941 tf->lbam = cdb[18];
2942 tf->lbah = cdb[17];
2943 tf->device = cdb[24];
2944 tf->command = cdb[25];
2945 tf->auxiliary = get_unaligned_be32(&cdb[28]);
2946 }
2947
2948 /* For NCQ commands copy the tag value */
2949 if (ata_is_ncq(tf->protocol))
2950 tf->nsect = qc->hw_tag << 3;
2951
2952 /* enforce correct master/slave bit */
2953 tf->device = dev->devno ?
2954 tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
2955
2956 switch (tf->command) {
2957 /* READ/WRITE LONG use a non-standard sect_size */
2958 case ATA_CMD_READ_LONG:
2959 case ATA_CMD_READ_LONG_ONCE:
2960 case ATA_CMD_WRITE_LONG:
2961 case ATA_CMD_WRITE_LONG_ONCE:
2962 if (tf->protocol != ATA_PROT_PIO || tf->nsect != 1) {
2963 fp = 1;
2964 goto invalid_fld;
2965 }
2966 qc->sect_size = scsi_bufflen(scmd);
2967 break;
2968
2969 /* commands using reported Logical Block size (e.g. 512 or 4K) */
2970 case ATA_CMD_CFA_WRITE_NE:
2971 case ATA_CMD_CFA_TRANS_SECT:
2972 case ATA_CMD_CFA_WRITE_MULT_NE:
2973 /* XXX: case ATA_CMD_CFA_WRITE_SECTORS_WITHOUT_ERASE: */
2974 case ATA_CMD_READ:
2975 case ATA_CMD_READ_EXT:
2976 case ATA_CMD_READ_QUEUED:
2977 /* XXX: case ATA_CMD_READ_QUEUED_EXT: */
2978 case ATA_CMD_FPDMA_READ:
2979 case ATA_CMD_READ_MULTI:
2980 case ATA_CMD_READ_MULTI_EXT:
2981 case ATA_CMD_PIO_READ:
2982 case ATA_CMD_PIO_READ_EXT:
2983 case ATA_CMD_READ_STREAM_DMA_EXT:
2984 case ATA_CMD_READ_STREAM_EXT:
2985 case ATA_CMD_VERIFY:
2986 case ATA_CMD_VERIFY_EXT:
2987 case ATA_CMD_WRITE:
2988 case ATA_CMD_WRITE_EXT:
2989 case ATA_CMD_WRITE_FUA_EXT:
2990 case ATA_CMD_WRITE_QUEUED:
2991 case ATA_CMD_WRITE_QUEUED_FUA_EXT:
2992 case ATA_CMD_FPDMA_WRITE:
2993 case ATA_CMD_WRITE_MULTI:
2994 case ATA_CMD_WRITE_MULTI_EXT:
2995 case ATA_CMD_WRITE_MULTI_FUA_EXT:
2996 case ATA_CMD_PIO_WRITE:
2997 case ATA_CMD_PIO_WRITE_EXT:
2998 case ATA_CMD_WRITE_STREAM_DMA_EXT:
2999 case ATA_CMD_WRITE_STREAM_EXT:
3000 qc->sect_size = scmd->device->sector_size;
3001 break;
3002
3003 /* Everything else uses 512 byte "sectors" */
3004 default:
3005 qc->sect_size = ATA_SECT_SIZE;
3006 }
3007
3008 /*
3009 * Set flags so that all registers will be written, pass on
3010 * write indication (used for PIO/DMA setup), result TF is
3011 * copied back and we don't whine too much about its failure.
3012 */
3013 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
3014 if (scmd->sc_data_direction == DMA_TO_DEVICE)
3015 tf->flags |= ATA_TFLAG_WRITE;
3016
3017 qc->flags |= ATA_QCFLAG_RESULT_TF | ATA_QCFLAG_QUIET;
3018
3019 /*
3020 * Set transfer length.
3021 *
3022 * TODO: find out if we need to do more here to
3023 * cover scatter/gather case.
3024 */
3025 ata_qc_set_pc_nbytes(qc);
3026
3027 /* We may not issue DMA commands if no DMA mode is set */
3028 if (tf->protocol == ATA_PROT_DMA && dev->dma_mode == 0) {
3029 fp = 1;
3030 goto invalid_fld;
3031 }
3032
3033 /* We may not issue NCQ commands to devices not supporting NCQ */
3034 if (ata_is_ncq(tf->protocol) && !ata_ncq_enabled(dev)) {
3035 fp = 1;
3036 goto invalid_fld;
3037 }
3038
3039 /* sanity check for pio multi commands */
3040 if ((cdb[1] & 0xe0) && !is_multi_taskfile(tf)) {
3041 fp = 1;
3042 goto invalid_fld;
3043 }
3044
3045 if (is_multi_taskfile(tf)) {
3046 unsigned int multi_count = 1 << (cdb[1] >> 5);
3047
3048 /* compare the passed through multi_count
3049 * with the cached multi_count of libata
3050 */
3051 if (multi_count != dev->multi_count)
3052 ata_dev_warn(dev, "invalid multi_count %u ignored\n",
3053 multi_count);
3054 }
3055
3056 /*
3057 * Filter SET_FEATURES - XFER MODE command -- otherwise,
3058 * SET_FEATURES - XFER MODE must be preceded/succeeded
3059 * by an update to hardware-specific registers for each
3060 * controller (i.e. the reason for ->set_piomode(),
3061 * ->set_dmamode(), and ->post_set_mode() hooks).
3062 */
3063 if (tf->command == ATA_CMD_SET_FEATURES &&
3064 tf->feature == SETFEATURES_XFER) {
3065 fp = (cdb[0] == ATA_16) ? 4 : 3;
3066 goto invalid_fld;
3067 }
3068
3069 /*
3070 * Filter TPM commands by default. These provide an
3071 * essentially uncontrolled encrypted "back door" between
3072 * applications and the disk. Set libata.allow_tpm=1 if you
3073 * have a real reason for wanting to use them. This ensures
3074 * that installed software cannot easily mess stuff up without
3075 * user intent. DVR type users will probably ship with this enabled
3076 * for movie content management.
3077 *
3078 * Note that for ATA8 we can issue a DCS change and DCS freeze lock
3079 * for this and should do in future but that it is not sufficient as
3080 * DCS is an optional feature set. Thus we also do the software filter
3081 * so that we comply with the TC consortium stated goal that the user
3082 * can turn off TC features of their system.
3083 */
3084 if (tf->command >= 0x5C && tf->command <= 0x5F && !libata_allow_tpm) {
3085 fp = (cdb[0] == ATA_16) ? 14 : 9;
3086 goto invalid_fld;
3087 }
3088
3089 return 0;
3090
3091 invalid_fld:
3092 ata_scsi_set_invalid_field(dev, scmd, fp, 0xff);
3093 return 1;
3094}
3095
3096/**
3097 * ata_format_dsm_trim_descr() - SATL Write Same to DSM Trim
3098 * @cmd: SCSI command being translated
3099 * @trmax: Maximum number of entries that will fit in sector_size bytes.
3100 * @sector: Starting sector
3101 * @count: Total Range of request in logical sectors
3102 *
3103 * Rewrite the WRITE SAME descriptor to be a DSM TRIM little-endian formatted
3104 * descriptor.
3105 *
3106 * Upto 64 entries of the format:
3107 * 63:48 Range Length
3108 * 47:0 LBA
3109 *
3110 * Range Length of 0 is ignored.
3111 * LBA's should be sorted order and not overlap.
3112 *
3113 * NOTE: this is the same format as ADD LBA(S) TO NV CACHE PINNED SET
3114 *
3115 * Return: Number of bytes copied into sglist.
3116 */
3117static size_t ata_format_dsm_trim_descr(struct scsi_cmnd *cmd, u32 trmax,
3118 u64 sector, u32 count)
3119{
3120 struct scsi_device *sdp = cmd->device;
3121 size_t len = sdp->sector_size;
3122 size_t r;
3123 __le64 *buf;
3124 u32 i = 0;
3125 unsigned long flags;
3126
3127 WARN_ON(len > ATA_SCSI_RBUF_SIZE);
3128
3129 if (len > ATA_SCSI_RBUF_SIZE)
3130 len = ATA_SCSI_RBUF_SIZE;
3131
3132 spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
3133 buf = ((void *)ata_scsi_rbuf);
3134 memset(buf, 0, len);
3135 while (i < trmax) {
3136 u64 entry = sector |
3137 ((u64)(count > 0xffff ? 0xffff : count) << 48);
3138 buf[i++] = __cpu_to_le64(entry);
3139 if (count <= 0xffff)
3140 break;
3141 count -= 0xffff;
3142 sector += 0xffff;
3143 }
3144 r = sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), buf, len);
3145 spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
3146
3147 return r;
3148}
3149
3150/**
3151 * ata_scsi_write_same_xlat() - SATL Write Same to ATA SCT Write Same
3152 * @qc: Command to be translated
3153 *
3154 * Translate a SCSI WRITE SAME command to be either a DSM TRIM command or
3155 * an SCT Write Same command.
3156 * Based on WRITE SAME has the UNMAP flag:
3157 *
3158 * - When set translate to DSM TRIM
3159 * - When clear translate to SCT Write Same
3160 */
3161static unsigned int ata_scsi_write_same_xlat(struct ata_queued_cmd *qc)
3162{
3163 struct ata_taskfile *tf = &qc->tf;
3164 struct scsi_cmnd *scmd = qc->scsicmd;
3165 struct scsi_device *sdp = scmd->device;
3166 size_t len = sdp->sector_size;
3167 struct ata_device *dev = qc->dev;
3168 const u8 *cdb = scmd->cmnd;
3169 u64 block;
3170 u32 n_block;
3171 const u32 trmax = len >> 3;
3172 u32 size;
3173 u16 fp;
3174 u8 bp = 0xff;
3175 u8 unmap = cdb[1] & 0x8;
3176
3177 /* we may not issue DMA commands if no DMA mode is set */
3178 if (unlikely(!dev->dma_mode))
3179 goto invalid_opcode;
3180
3181 /*
3182 * We only allow sending this command through the block layer,
3183 * as it modifies the DATA OUT buffer, which would corrupt user
3184 * memory for SG_IO commands.
3185 */
3186 if (unlikely(blk_rq_is_passthrough(scmd->request)))
3187 goto invalid_opcode;
3188
3189 if (unlikely(scmd->cmd_len < 16)) {
3190 fp = 15;
3191 goto invalid_fld;
3192 }
3193 scsi_16_lba_len(cdb, &block, &n_block);
3194
3195 if (!unmap ||
3196 (dev->horkage & ATA_HORKAGE_NOTRIM) ||
3197 !ata_id_has_trim(dev->id)) {
3198 fp = 1;
3199 bp = 3;
3200 goto invalid_fld;
3201 }
3202 /* If the request is too large the cmd is invalid */
3203 if (n_block > 0xffff * trmax) {
3204 fp = 2;
3205 goto invalid_fld;
3206 }
3207
3208 /*
3209 * WRITE SAME always has a sector sized buffer as payload, this
3210 * should never be a multiple entry S/G list.
3211 */
3212 if (!scsi_sg_count(scmd))
3213 goto invalid_param_len;
3214
3215 /*
3216 * size must match sector size in bytes
3217 * For DATA SET MANAGEMENT TRIM in ACS-2 nsect (aka count)
3218 * is defined as number of 512 byte blocks to be transferred.
3219 */
3220
3221 size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);
3222 if (size != len)
3223 goto invalid_param_len;
3224
3225 if (ata_ncq_enabled(dev) && ata_fpdma_dsm_supported(dev)) {
3226 /* Newer devices support queued TRIM commands */
3227 tf->protocol = ATA_PROT_NCQ;
3228 tf->command = ATA_CMD_FPDMA_SEND;
3229 tf->hob_nsect = ATA_SUBCMD_FPDMA_SEND_DSM & 0x1f;
3230 tf->nsect = qc->hw_tag << 3;
3231 tf->hob_feature = (size / 512) >> 8;
3232 tf->feature = size / 512;
3233
3234 tf->auxiliary = 1;
3235 } else {
3236 tf->protocol = ATA_PROT_DMA;
3237 tf->hob_feature = 0;
3238 tf->feature = ATA_DSM_TRIM;
3239 tf->hob_nsect = (size / 512) >> 8;
3240 tf->nsect = size / 512;
3241 tf->command = ATA_CMD_DSM;
3242 }
3243
3244 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48 |
3245 ATA_TFLAG_WRITE;
3246
3247 ata_qc_set_pc_nbytes(qc);
3248
3249 return 0;
3250
3251invalid_fld:
3252 ata_scsi_set_invalid_field(dev, scmd, fp, bp);
3253 return 1;
3254invalid_param_len:
3255 /* "Parameter list length error" */
3256 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3257 return 1;
3258invalid_opcode:
3259 /* "Invalid command operation code" */
3260 ata_scsi_set_sense(dev, scmd, ILLEGAL_REQUEST, 0x20, 0x0);
3261 return 1;
3262}
3263
3264/**
3265 * ata_scsiop_maint_in - Simulate a subset of MAINTENANCE_IN
3266 * @args: device MAINTENANCE_IN data / SCSI command of interest.
3267 * @rbuf: Response buffer, to which simulated SCSI cmd output is sent.
3268 *
3269 * Yields a subset to satisfy scsi_report_opcode()
3270 *
3271 * LOCKING:
3272 * spin_lock_irqsave(host lock)
3273 */
3274static unsigned int ata_scsiop_maint_in(struct ata_scsi_args *args, u8 *rbuf)
3275{
3276 struct ata_device *dev = args->dev;
3277 u8 *cdb = args->cmd->cmnd;
3278 u8 supported = 0;
3279 unsigned int err = 0;
3280
3281 if (cdb[2] != 1) {
3282 ata_dev_warn(dev, "invalid command format %d\n", cdb[2]);
3283 err = 2;
3284 goto out;
3285 }
3286 switch (cdb[3]) {
3287 case INQUIRY:
3288 case MODE_SENSE:
3289 case MODE_SENSE_10:
3290 case READ_CAPACITY:
3291 case SERVICE_ACTION_IN_16:
3292 case REPORT_LUNS:
3293 case REQUEST_SENSE:
3294 case SYNCHRONIZE_CACHE:
3295 case REZERO_UNIT:
3296 case SEEK_6:
3297 case SEEK_10:
3298 case TEST_UNIT_READY:
3299 case SEND_DIAGNOSTIC:
3300 case MAINTENANCE_IN:
3301 case READ_6:
3302 case READ_10:
3303 case READ_16:
3304 case WRITE_6:
3305 case WRITE_10:
3306 case WRITE_16:
3307 case ATA_12:
3308 case ATA_16:
3309 case VERIFY:
3310 case VERIFY_16:
3311 case MODE_SELECT:
3312 case MODE_SELECT_10:
3313 case START_STOP:
3314 supported = 3;
3315 break;
3316 case ZBC_IN:
3317 case ZBC_OUT:
3318 if (ata_id_zoned_cap(dev->id) ||
3319 dev->class == ATA_DEV_ZAC)
3320 supported = 3;
3321 break;
3322 case SECURITY_PROTOCOL_IN:
3323 case SECURITY_PROTOCOL_OUT:
3324 if (dev->flags & ATA_DFLAG_TRUSTED)
3325 supported = 3;
3326 break;
3327 default:
3328 break;
3329 }
3330out:
3331 rbuf[1] = supported; /* supported */
3332 return err;
3333}
3334
3335/**
3336 * ata_scsi_report_zones_complete - convert ATA output
3337 * @qc: command structure returning the data
3338 *
3339 * Convert T-13 little-endian field representation into
3340 * T-10 big-endian field representation.
3341 * What a mess.
3342 */
3343static void ata_scsi_report_zones_complete(struct ata_queued_cmd *qc)
3344{
3345 struct scsi_cmnd *scmd = qc->scsicmd;
3346 struct sg_mapping_iter miter;
3347 unsigned long flags;
3348 unsigned int bytes = 0;
3349
3350 sg_miter_start(&miter, scsi_sglist(scmd), scsi_sg_count(scmd),
3351 SG_MITER_TO_SG | SG_MITER_ATOMIC);
3352
3353 local_irq_save(flags);
3354 while (sg_miter_next(&miter)) {
3355 unsigned int offset = 0;
3356
3357 if (bytes == 0) {
3358 char *hdr;
3359 u32 list_length;
3360 u64 max_lba, opt_lba;
3361 u16 same;
3362
3363 /* Swizzle header */
3364 hdr = miter.addr;
3365 list_length = get_unaligned_le32(&hdr[0]);
3366 same = get_unaligned_le16(&hdr[4]);
3367 max_lba = get_unaligned_le64(&hdr[8]);
3368 opt_lba = get_unaligned_le64(&hdr[16]);
3369 put_unaligned_be32(list_length, &hdr[0]);
3370 hdr[4] = same & 0xf;
3371 put_unaligned_be64(max_lba, &hdr[8]);
3372 put_unaligned_be64(opt_lba, &hdr[16]);
3373 offset += 64;
3374 bytes += 64;
3375 }
3376 while (offset < miter.length) {
3377 char *rec;
3378 u8 cond, type, non_seq, reset;
3379 u64 size, start, wp;
3380
3381 /* Swizzle zone descriptor */
3382 rec = miter.addr + offset;
3383 type = rec[0] & 0xf;
3384 cond = (rec[1] >> 4) & 0xf;
3385 non_seq = (rec[1] & 2);
3386 reset = (rec[1] & 1);
3387 size = get_unaligned_le64(&rec[8]);
3388 start = get_unaligned_le64(&rec[16]);
3389 wp = get_unaligned_le64(&rec[24]);
3390 rec[0] = type;
3391 rec[1] = (cond << 4) | non_seq | reset;
3392 put_unaligned_be64(size, &rec[8]);
3393 put_unaligned_be64(start, &rec[16]);
3394 put_unaligned_be64(wp, &rec[24]);
3395 WARN_ON(offset + 64 > miter.length);
3396 offset += 64;
3397 bytes += 64;
3398 }
3399 }
3400 sg_miter_stop(&miter);
3401 local_irq_restore(flags);
3402
3403 ata_scsi_qc_complete(qc);
3404}
3405
3406static unsigned int ata_scsi_zbc_in_xlat(struct ata_queued_cmd *qc)
3407{
3408 struct ata_taskfile *tf = &qc->tf;
3409 struct scsi_cmnd *scmd = qc->scsicmd;
3410 const u8 *cdb = scmd->cmnd;
3411 u16 sect, fp = (u16)-1;
3412 u8 sa, options, bp = 0xff;
3413 u64 block;
3414 u32 n_block;
3415
3416 if (unlikely(scmd->cmd_len < 16)) {
3417 ata_dev_warn(qc->dev, "invalid cdb length %d\n",
3418 scmd->cmd_len);
3419 fp = 15;
3420 goto invalid_fld;
3421 }
3422 scsi_16_lba_len(cdb, &block, &n_block);
3423 if (n_block != scsi_bufflen(scmd)) {
3424 ata_dev_warn(qc->dev, "non-matching transfer count (%d/%d)\n",
3425 n_block, scsi_bufflen(scmd));
3426 goto invalid_param_len;
3427 }
3428 sa = cdb[1] & 0x1f;
3429 if (sa != ZI_REPORT_ZONES) {
3430 ata_dev_warn(qc->dev, "invalid service action %d\n", sa);
3431 fp = 1;
3432 goto invalid_fld;
3433 }
3434 /*
3435 * ZAC allows only for transfers in 512 byte blocks,
3436 * and uses a 16 bit value for the transfer count.
3437 */
3438 if ((n_block / 512) > 0xffff || n_block < 512 || (n_block % 512)) {
3439 ata_dev_warn(qc->dev, "invalid transfer count %d\n", n_block);
3440 goto invalid_param_len;
3441 }
3442 sect = n_block / 512;
3443 options = cdb[14] & 0xbf;
3444
3445 if (ata_ncq_enabled(qc->dev) &&
3446 ata_fpdma_zac_mgmt_in_supported(qc->dev)) {
3447 tf->protocol = ATA_PROT_NCQ;
3448 tf->command = ATA_CMD_FPDMA_RECV;
3449 tf->hob_nsect = ATA_SUBCMD_FPDMA_RECV_ZAC_MGMT_IN & 0x1f;
3450 tf->nsect = qc->hw_tag << 3;
3451 tf->feature = sect & 0xff;
3452 tf->hob_feature = (sect >> 8) & 0xff;
3453 tf->auxiliary = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES | (options << 8);
3454 } else {
3455 tf->command = ATA_CMD_ZAC_MGMT_IN;
3456 tf->feature = ATA_SUBCMD_ZAC_MGMT_IN_REPORT_ZONES;
3457 tf->protocol = ATA_PROT_DMA;
3458 tf->hob_feature = options;
3459 tf->hob_nsect = (sect >> 8) & 0xff;
3460 tf->nsect = sect & 0xff;
3461 }
3462 tf->device = ATA_LBA;
3463 tf->lbah = (block >> 16) & 0xff;
3464 tf->lbam = (block >> 8) & 0xff;
3465 tf->lbal = block & 0xff;
3466 tf->hob_lbah = (block >> 40) & 0xff;
3467 tf->hob_lbam = (block >> 32) & 0xff;
3468 tf->hob_lbal = (block >> 24) & 0xff;
3469
3470 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3471 qc->flags |= ATA_QCFLAG_RESULT_TF;
3472
3473 ata_qc_set_pc_nbytes(qc);
3474
3475 qc->complete_fn = ata_scsi_report_zones_complete;
3476
3477 return 0;
3478
3479invalid_fld:
3480 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
3481 return 1;
3482
3483invalid_param_len:
3484 /* "Parameter list length error" */
3485 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3486 return 1;
3487}
3488
3489static unsigned int ata_scsi_zbc_out_xlat(struct ata_queued_cmd *qc)
3490{
3491 struct ata_taskfile *tf = &qc->tf;
3492 struct scsi_cmnd *scmd = qc->scsicmd;
3493 struct ata_device *dev = qc->dev;
3494 const u8 *cdb = scmd->cmnd;
3495 u8 all, sa;
3496 u64 block;
3497 u32 n_block;
3498 u16 fp = (u16)-1;
3499
3500 if (unlikely(scmd->cmd_len < 16)) {
3501 fp = 15;
3502 goto invalid_fld;
3503 }
3504
3505 sa = cdb[1] & 0x1f;
3506 if ((sa != ZO_CLOSE_ZONE) && (sa != ZO_FINISH_ZONE) &&
3507 (sa != ZO_OPEN_ZONE) && (sa != ZO_RESET_WRITE_POINTER)) {
3508 fp = 1;
3509 goto invalid_fld;
3510 }
3511
3512 scsi_16_lba_len(cdb, &block, &n_block);
3513 if (n_block) {
3514 /*
3515 * ZAC MANAGEMENT OUT doesn't define any length
3516 */
3517 goto invalid_param_len;
3518 }
3519
3520 all = cdb[14] & 0x1;
3521 if (all) {
3522 /*
3523 * Ignore the block address (zone ID) as defined by ZBC.
3524 */
3525 block = 0;
3526 } else if (block >= dev->n_sectors) {
3527 /*
3528 * Block must be a valid zone ID (a zone start LBA).
3529 */
3530 fp = 2;
3531 goto invalid_fld;
3532 }
3533
3534 if (ata_ncq_enabled(qc->dev) &&
3535 ata_fpdma_zac_mgmt_out_supported(qc->dev)) {
3536 tf->protocol = ATA_PROT_NCQ_NODATA;
3537 tf->command = ATA_CMD_NCQ_NON_DATA;
3538 tf->feature = ATA_SUBCMD_NCQ_NON_DATA_ZAC_MGMT_OUT;
3539 tf->nsect = qc->hw_tag << 3;
3540 tf->auxiliary = sa | ((u16)all << 8);
3541 } else {
3542 tf->protocol = ATA_PROT_NODATA;
3543 tf->command = ATA_CMD_ZAC_MGMT_OUT;
3544 tf->feature = sa;
3545 tf->hob_feature = all;
3546 }
3547 tf->lbah = (block >> 16) & 0xff;
3548 tf->lbam = (block >> 8) & 0xff;
3549 tf->lbal = block & 0xff;
3550 tf->hob_lbah = (block >> 40) & 0xff;
3551 tf->hob_lbam = (block >> 32) & 0xff;
3552 tf->hob_lbal = (block >> 24) & 0xff;
3553 tf->device = ATA_LBA;
3554 tf->flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE | ATA_TFLAG_LBA48;
3555
3556 return 0;
3557
3558 invalid_fld:
3559 ata_scsi_set_invalid_field(qc->dev, scmd, fp, 0xff);
3560 return 1;
3561invalid_param_len:
3562 /* "Parameter list length error" */
3563 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3564 return 1;
3565}
3566
3567/**
3568 * ata_mselect_caching - Simulate MODE SELECT for caching info page
3569 * @qc: Storage for translated ATA taskfile
3570 * @buf: input buffer
3571 * @len: number of valid bytes in the input buffer
3572 * @fp: out parameter for the failed field on error
3573 *
3574 * Prepare a taskfile to modify caching information for the device.
3575 *
3576 * LOCKING:
3577 * None.
3578 */
3579static int ata_mselect_caching(struct ata_queued_cmd *qc,
3580 const u8 *buf, int len, u16 *fp)
3581{
3582 struct ata_taskfile *tf = &qc->tf;
3583 struct ata_device *dev = qc->dev;
3584 u8 mpage[CACHE_MPAGE_LEN];
3585 u8 wce;
3586 int i;
3587
3588 /*
3589 * The first two bytes of def_cache_mpage are a header, so offsets
3590 * in mpage are off by 2 compared to buf. Same for len.
3591 */
3592
3593 if (len != CACHE_MPAGE_LEN - 2) {
3594 if (len < CACHE_MPAGE_LEN - 2)
3595 *fp = len;
3596 else
3597 *fp = CACHE_MPAGE_LEN - 2;
3598 return -EINVAL;
3599 }
3600
3601 wce = buf[0] & (1 << 2);
3602
3603 /*
3604 * Check that read-only bits are not modified.
3605 */
3606 ata_msense_caching(dev->id, mpage, false);
3607 for (i = 0; i < CACHE_MPAGE_LEN - 2; i++) {
3608 if (i == 0)
3609 continue;
3610 if (mpage[i + 2] != buf[i]) {
3611 *fp = i;
3612 return -EINVAL;
3613 }
3614 }
3615
3616 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR;
3617 tf->protocol = ATA_PROT_NODATA;
3618 tf->nsect = 0;
3619 tf->command = ATA_CMD_SET_FEATURES;
3620 tf->feature = wce ? SETFEATURES_WC_ON : SETFEATURES_WC_OFF;
3621 return 0;
3622}
3623
3624/**
3625 * ata_mselect_control - Simulate MODE SELECT for control page
3626 * @qc: Storage for translated ATA taskfile
3627 * @buf: input buffer
3628 * @len: number of valid bytes in the input buffer
3629 * @fp: out parameter for the failed field on error
3630 *
3631 * Prepare a taskfile to modify caching information for the device.
3632 *
3633 * LOCKING:
3634 * None.
3635 */
3636static int ata_mselect_control(struct ata_queued_cmd *qc,
3637 const u8 *buf, int len, u16 *fp)
3638{
3639 struct ata_device *dev = qc->dev;
3640 u8 mpage[CONTROL_MPAGE_LEN];
3641 u8 d_sense;
3642 int i;
3643
3644 /*
3645 * The first two bytes of def_control_mpage are a header, so offsets
3646 * in mpage are off by 2 compared to buf. Same for len.
3647 */
3648
3649 if (len != CONTROL_MPAGE_LEN - 2) {
3650 if (len < CONTROL_MPAGE_LEN - 2)
3651 *fp = len;
3652 else
3653 *fp = CONTROL_MPAGE_LEN - 2;
3654 return -EINVAL;
3655 }
3656
3657 d_sense = buf[0] & (1 << 2);
3658
3659 /*
3660 * Check that read-only bits are not modified.
3661 */
3662 ata_msense_control(dev, mpage, false);
3663 for (i = 0; i < CONTROL_MPAGE_LEN - 2; i++) {
3664 if (i == 0)
3665 continue;
3666 if (mpage[2 + i] != buf[i]) {
3667 *fp = i;
3668 return -EINVAL;
3669 }
3670 }
3671 if (d_sense & (1 << 2))
3672 dev->flags |= ATA_DFLAG_D_SENSE;
3673 else
3674 dev->flags &= ~ATA_DFLAG_D_SENSE;
3675 return 0;
3676}
3677
3678/**
3679 * ata_scsi_mode_select_xlat - Simulate MODE SELECT 6, 10 commands
3680 * @qc: Storage for translated ATA taskfile
3681 *
3682 * Converts a MODE SELECT command to an ATA SET FEATURES taskfile.
3683 * Assume this is invoked for direct access devices (e.g. disks) only.
3684 * There should be no block descriptor for other device types.
3685 *
3686 * LOCKING:
3687 * spin_lock_irqsave(host lock)
3688 */
3689static unsigned int ata_scsi_mode_select_xlat(struct ata_queued_cmd *qc)
3690{
3691 struct scsi_cmnd *scmd = qc->scsicmd;
3692 const u8 *cdb = scmd->cmnd;
3693 u8 pg, spg;
3694 unsigned six_byte, pg_len, hdr_len, bd_len;
3695 int len;
3696 u16 fp = (u16)-1;
3697 u8 bp = 0xff;
3698 u8 buffer[64];
3699 const u8 *p = buffer;
3700
3701 VPRINTK("ENTER\n");
3702
3703 six_byte = (cdb[0] == MODE_SELECT);
3704 if (six_byte) {
3705 if (scmd->cmd_len < 5) {
3706 fp = 4;
3707 goto invalid_fld;
3708 }
3709
3710 len = cdb[4];
3711 hdr_len = 4;
3712 } else {
3713 if (scmd->cmd_len < 9) {
3714 fp = 8;
3715 goto invalid_fld;
3716 }
3717
3718 len = (cdb[7] << 8) + cdb[8];
3719 hdr_len = 8;
3720 }
3721
3722 /* We only support PF=1, SP=0. */
3723 if ((cdb[1] & 0x11) != 0x10) {
3724 fp = 1;
3725 bp = (cdb[1] & 0x01) ? 1 : 5;
3726 goto invalid_fld;
3727 }
3728
3729 /* Test early for possible overrun. */
3730 if (!scsi_sg_count(scmd) || scsi_sglist(scmd)->length < len)
3731 goto invalid_param_len;
3732
3733 /* Move past header and block descriptors. */
3734 if (len < hdr_len)
3735 goto invalid_param_len;
3736
3737 if (!sg_copy_to_buffer(scsi_sglist(scmd), scsi_sg_count(scmd),
3738 buffer, sizeof(buffer)))
3739 goto invalid_param_len;
3740
3741 if (six_byte)
3742 bd_len = p[3];
3743 else
3744 bd_len = (p[6] << 8) + p[7];
3745
3746 len -= hdr_len;
3747 p += hdr_len;
3748 if (len < bd_len)
3749 goto invalid_param_len;
3750 if (bd_len != 0 && bd_len != 8) {
3751 fp = (six_byte) ? 3 : 6;
3752 fp += bd_len + hdr_len;
3753 goto invalid_param;
3754 }
3755
3756 len -= bd_len;
3757 p += bd_len;
3758 if (len == 0)
3759 goto skip;
3760
3761 /* Parse both possible formats for the mode page headers. */
3762 pg = p[0] & 0x3f;
3763 if (p[0] & 0x40) {
3764 if (len < 4)
3765 goto invalid_param_len;
3766
3767 spg = p[1];
3768 pg_len = (p[2] << 8) | p[3];
3769 p += 4;
3770 len -= 4;
3771 } else {
3772 if (len < 2)
3773 goto invalid_param_len;
3774
3775 spg = 0;
3776 pg_len = p[1];
3777 p += 2;
3778 len -= 2;
3779 }
3780
3781 /*
3782 * No mode subpages supported (yet) but asking for _all_
3783 * subpages may be valid
3784 */
3785 if (spg && (spg != ALL_SUB_MPAGES)) {
3786 fp = (p[0] & 0x40) ? 1 : 0;
3787 fp += hdr_len + bd_len;
3788 goto invalid_param;
3789 }
3790 if (pg_len > len)
3791 goto invalid_param_len;
3792
3793 switch (pg) {
3794 case CACHE_MPAGE:
3795 if (ata_mselect_caching(qc, p, pg_len, &fp) < 0) {
3796 fp += hdr_len + bd_len;
3797 goto invalid_param;
3798 }
3799 break;
3800 case CONTROL_MPAGE:
3801 if (ata_mselect_control(qc, p, pg_len, &fp) < 0) {
3802 fp += hdr_len + bd_len;
3803 goto invalid_param;
3804 } else {
3805 goto skip; /* No ATA command to send */
3806 }
3807 break;
3808 default: /* invalid page code */
3809 fp = bd_len + hdr_len;
3810 goto invalid_param;
3811 }
3812
3813 /*
3814 * Only one page has changeable data, so we only support setting one
3815 * page at a time.
3816 */
3817 if (len > pg_len)
3818 goto invalid_param;
3819
3820 return 0;
3821
3822 invalid_fld:
3823 ata_scsi_set_invalid_field(qc->dev, scmd, fp, bp);
3824 return 1;
3825
3826 invalid_param:
3827 ata_scsi_set_invalid_parameter(qc->dev, scmd, fp);
3828 return 1;
3829
3830 invalid_param_len:
3831 /* "Parameter list length error" */
3832 ata_scsi_set_sense(qc->dev, scmd, ILLEGAL_REQUEST, 0x1a, 0x0);
3833 return 1;
3834
3835 skip:
3836 scmd->result = SAM_STAT_GOOD;
3837 return 1;
3838}
3839
3840static u8 ata_scsi_trusted_op(u32 len, bool send, bool dma)
3841{
3842 if (len == 0)
3843 return ATA_CMD_TRUSTED_NONDATA;
3844 else if (send)
3845 return dma ? ATA_CMD_TRUSTED_SND_DMA : ATA_CMD_TRUSTED_SND;
3846 else
3847 return dma ? ATA_CMD_TRUSTED_RCV_DMA : ATA_CMD_TRUSTED_RCV;
3848}
3849
3850static unsigned int ata_scsi_security_inout_xlat(struct ata_queued_cmd *qc)
3851{
3852 struct scsi_cmnd *scmd = qc->scsicmd;
3853 const u8 *cdb = scmd->cmnd;
3854 struct ata_taskfile *tf = &qc->tf;
3855 u8 secp = cdb[1];
3856 bool send = (cdb[0] == SECURITY_PROTOCOL_OUT);
3857 u16 spsp = get_unaligned_be16(&cdb[2]);
3858 u32 len = get_unaligned_be32(&cdb[6]);
3859 bool dma = !(qc->dev->flags & ATA_DFLAG_PIO);
3860
3861 /*
3862 * We don't support the ATA "security" protocol.
3863 */
3864 if (secp == 0xef) {
3865 ata_scsi_set_invalid_field(qc->dev, scmd, 1, 0);
3866 return 1;
3867 }
3868
3869 if (cdb[4] & 7) { /* INC_512 */
3870 if (len > 0xffff) {
3871 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
3872 return 1;
3873 }
3874 } else {
3875 if (len > 0x01fffe00) {
3876 ata_scsi_set_invalid_field(qc->dev, scmd, 6, 0);
3877 return 1;
3878 }
3879
3880 /* convert to the sector-based ATA addressing */
3881 len = (len + 511) / 512;
3882 }
3883
3884 tf->protocol = dma ? ATA_PROT_DMA : ATA_PROT_PIO;
3885 tf->flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR | ATA_TFLAG_LBA;
3886 if (send)
3887 tf->flags |= ATA_TFLAG_WRITE;
3888 tf->command = ata_scsi_trusted_op(len, send, dma);
3889 tf->feature = secp;
3890 tf->lbam = spsp & 0xff;
3891 tf->lbah = spsp >> 8;
3892
3893 if (len) {
3894 tf->nsect = len & 0xff;
3895 tf->lbal = len >> 8;
3896 } else {
3897 if (!send)
3898 tf->lbah = (1 << 7);
3899 }
3900
3901 ata_qc_set_pc_nbytes(qc);
3902 return 0;
3903}
3904
3905/**
3906 * ata_scsi_var_len_cdb_xlat - SATL variable length CDB to Handler
3907 * @qc: Command to be translated
3908 *
3909 * Translate a SCSI variable length CDB to specified commands.
3910 * It checks a service action value in CDB to call corresponding handler.
3911 *
3912 * RETURNS:
3913 * Zero on success, non-zero on failure
3914 *
3915 */
3916static unsigned int ata_scsi_var_len_cdb_xlat(struct ata_queued_cmd *qc)
3917{
3918 struct scsi_cmnd *scmd = qc->scsicmd;
3919 const u8 *cdb = scmd->cmnd;
3920 const u16 sa = get_unaligned_be16(&cdb[8]);
3921
3922 /*
3923 * if service action represents a ata pass-thru(32) command,
3924 * then pass it to ata_scsi_pass_thru handler.
3925 */
3926 if (sa == ATA_32)
3927 return ata_scsi_pass_thru(qc);
3928
3929 /* unsupported service action */
3930 return 1;
3931}
3932
3933/**
3934 * ata_get_xlat_func - check if SCSI to ATA translation is possible
3935 * @dev: ATA device
3936 * @cmd: SCSI command opcode to consider
3937 *
3938 * Look up the SCSI command given, and determine whether the
3939 * SCSI command is to be translated or simulated.
3940 *
3941 * RETURNS:
3942 * Pointer to translation function if possible, %NULL if not.
3943 */
3944
3945static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
3946{
3947 switch (cmd) {
3948 case READ_6:
3949 case READ_10:
3950 case READ_16:
3951
3952 case WRITE_6:
3953 case WRITE_10:
3954 case WRITE_16:
3955 return ata_scsi_rw_xlat;
3956
3957 case WRITE_SAME_16:
3958 return ata_scsi_write_same_xlat;
3959
3960 case SYNCHRONIZE_CACHE:
3961 if (ata_try_flush_cache(dev))
3962 return ata_scsi_flush_xlat;
3963 break;
3964
3965 case VERIFY:
3966 case VERIFY_16:
3967 return ata_scsi_verify_xlat;
3968
3969 case ATA_12:
3970 case ATA_16:
3971 return ata_scsi_pass_thru;
3972
3973 case VARIABLE_LENGTH_CMD:
3974 return ata_scsi_var_len_cdb_xlat;
3975
3976 case MODE_SELECT:
3977 case MODE_SELECT_10:
3978 return ata_scsi_mode_select_xlat;
3979 break;
3980
3981 case ZBC_IN:
3982 return ata_scsi_zbc_in_xlat;
3983
3984 case ZBC_OUT:
3985 return ata_scsi_zbc_out_xlat;
3986
3987 case SECURITY_PROTOCOL_IN:
3988 case SECURITY_PROTOCOL_OUT:
3989 if (!(dev->flags & ATA_DFLAG_TRUSTED))
3990 break;
3991 return ata_scsi_security_inout_xlat;
3992
3993 case START_STOP:
3994 return ata_scsi_start_stop_xlat;
3995 }
3996
3997 return NULL;
3998}
3999
4000/**
4001 * ata_scsi_dump_cdb - dump SCSI command contents to dmesg
4002 * @ap: ATA port to which the command was being sent
4003 * @cmd: SCSI command to dump
4004 *
4005 * Prints the contents of a SCSI command via printk().
4006 */
4007
4008void ata_scsi_dump_cdb(struct ata_port *ap, struct scsi_cmnd *cmd)
4009{
4010#ifdef ATA_VERBOSE_DEBUG
4011 struct scsi_device *scsidev = cmd->device;
4012
4013 VPRINTK("CDB (%u:%d,%d,%lld) %9ph\n",
4014 ap->print_id,
4015 scsidev->channel, scsidev->id, scsidev->lun,
4016 cmd->cmnd);
4017#endif
4018}
4019
4020int __ata_scsi_queuecmd(struct scsi_cmnd *scmd, struct ata_device *dev)
4021{
4022 u8 scsi_op = scmd->cmnd[0];
4023 ata_xlat_func_t xlat_func;
4024 int rc = 0;
4025
4026 if (dev->class == ATA_DEV_ATA || dev->class == ATA_DEV_ZAC) {
4027 if (unlikely(!scmd->cmd_len || scmd->cmd_len > dev->cdb_len))
4028 goto bad_cdb_len;
4029
4030 xlat_func = ata_get_xlat_func(dev, scsi_op);
4031 } else {
4032 if (unlikely(!scmd->cmd_len))
4033 goto bad_cdb_len;
4034
4035 xlat_func = NULL;
4036 if (likely((scsi_op != ATA_16) || !atapi_passthru16)) {
4037 /* relay SCSI command to ATAPI device */
4038 int len = COMMAND_SIZE(scsi_op);
4039 if (unlikely(len > scmd->cmd_len ||
4040 len > dev->cdb_len ||
4041 scmd->cmd_len > ATAPI_CDB_LEN))
4042 goto bad_cdb_len;
4043
4044 xlat_func = atapi_xlat;
4045 } else {
4046 /* ATA_16 passthru, treat as an ATA command */
4047 if (unlikely(scmd->cmd_len > 16))
4048 goto bad_cdb_len;
4049
4050 xlat_func = ata_get_xlat_func(dev, scsi_op);
4051 }
4052 }
4053
4054 if (xlat_func)
4055 rc = ata_scsi_translate(dev, scmd, xlat_func);
4056 else
4057 ata_scsi_simulate(dev, scmd);
4058
4059 return rc;
4060
4061 bad_cdb_len:
4062 DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
4063 scmd->cmd_len, scsi_op, dev->cdb_len);
4064 scmd->result = DID_ERROR << 16;
4065 scmd->scsi_done(scmd);
4066 return 0;
4067}
4068
4069/**
4070 * ata_scsi_queuecmd - Issue SCSI cdb to libata-managed device
4071 * @shost: SCSI host of command to be sent
4072 * @cmd: SCSI command to be sent
4073 *
4074 * In some cases, this function translates SCSI commands into
4075 * ATA taskfiles, and queues the taskfiles to be sent to
4076 * hardware. In other cases, this function simulates a
4077 * SCSI device by evaluating and responding to certain
4078 * SCSI commands. This creates the overall effect of
4079 * ATA and ATAPI devices appearing as SCSI devices.
4080 *
4081 * LOCKING:
4082 * ATA host lock
4083 *
4084 * RETURNS:
4085 * Return value from __ata_scsi_queuecmd() if @cmd can be queued,
4086 * 0 otherwise.
4087 */
4088int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
4089{
4090 struct ata_port *ap;
4091 struct ata_device *dev;
4092 struct scsi_device *scsidev = cmd->device;
4093 int rc = 0;
4094 unsigned long irq_flags;
4095
4096 ap = ata_shost_to_port(shost);
4097
4098 spin_lock_irqsave(ap->lock, irq_flags);
4099
4100 ata_scsi_dump_cdb(ap, cmd);
4101
4102 dev = ata_scsi_find_dev(ap, scsidev);
4103 if (likely(dev))
4104 rc = __ata_scsi_queuecmd(cmd, dev);
4105 else {
4106 cmd->result = (DID_BAD_TARGET << 16);
4107 cmd->scsi_done(cmd);
4108 }
4109
4110 spin_unlock_irqrestore(ap->lock, irq_flags);
4111
4112 return rc;
4113}
4114EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
4115
4116/**
4117 * ata_scsi_simulate - simulate SCSI command on ATA device
4118 * @dev: the target device
4119 * @cmd: SCSI command being sent to device.
4120 *
4121 * Interprets and directly executes a select list of SCSI commands
4122 * that can be handled internally.
4123 *
4124 * LOCKING:
4125 * spin_lock_irqsave(host lock)
4126 */
4127
4128void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
4129{
4130 struct ata_scsi_args args;
4131 const u8 *scsicmd = cmd->cmnd;
4132 u8 tmp8;
4133
4134 args.dev = dev;
4135 args.id = dev->id;
4136 args.cmd = cmd;
4137
4138 switch(scsicmd[0]) {
4139 case INQUIRY:
4140 if (scsicmd[1] & 2) /* is CmdDt set? */
4141 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
4142 else if ((scsicmd[1] & 1) == 0) /* is EVPD clear? */
4143 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
4144 else switch (scsicmd[2]) {
4145 case 0x00:
4146 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_00);
4147 break;
4148 case 0x80:
4149 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_80);
4150 break;
4151 case 0x83:
4152 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_83);
4153 break;
4154 case 0x89:
4155 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_89);
4156 break;
4157 case 0xb0:
4158 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b0);
4159 break;
4160 case 0xb1:
4161 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b1);
4162 break;
4163 case 0xb2:
4164 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
4165 break;
4166 case 0xb6:
4167 if (dev->flags & ATA_DFLAG_ZAC) {
4168 ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b6);
4169 break;
4170 }
4171 fallthrough;
4172 default:
4173 ata_scsi_set_invalid_field(dev, cmd, 2, 0xff);
4174 break;
4175 }
4176 break;
4177
4178 case MODE_SENSE:
4179 case MODE_SENSE_10:
4180 ata_scsi_rbuf_fill(&args, ata_scsiop_mode_sense);
4181 break;
4182
4183 case READ_CAPACITY:
4184 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
4185 break;
4186
4187 case SERVICE_ACTION_IN_16:
4188 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
4189 ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
4190 else
4191 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
4192 break;
4193
4194 case REPORT_LUNS:
4195 ata_scsi_rbuf_fill(&args, ata_scsiop_report_luns);
4196 break;
4197
4198 case REQUEST_SENSE:
4199 ata_scsi_set_sense(dev, cmd, 0, 0, 0);
4200 cmd->result = (DRIVER_SENSE << 24);
4201 break;
4202
4203 /* if we reach this, then writeback caching is disabled,
4204 * turning this into a no-op.
4205 */
4206 case SYNCHRONIZE_CACHE:
4207 fallthrough;
4208
4209 /* no-op's, complete with success */
4210 case REZERO_UNIT:
4211 case SEEK_6:
4212 case SEEK_10:
4213 case TEST_UNIT_READY:
4214 break;
4215
4216 case SEND_DIAGNOSTIC:
4217 tmp8 = scsicmd[1] & ~(1 << 3);
4218 if (tmp8 != 0x4 || scsicmd[3] || scsicmd[4])
4219 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
4220 break;
4221
4222 case MAINTENANCE_IN:
4223 if (scsicmd[1] == MI_REPORT_SUPPORTED_OPERATION_CODES)
4224 ata_scsi_rbuf_fill(&args, ata_scsiop_maint_in);
4225 else
4226 ata_scsi_set_invalid_field(dev, cmd, 1, 0xff);
4227 break;
4228
4229 /* all other commands */
4230 default:
4231 ata_scsi_set_sense(dev, cmd, ILLEGAL_REQUEST, 0x20, 0x0);
4232 /* "Invalid command operation code" */
4233 break;
4234 }
4235
4236 cmd->scsi_done(cmd);
4237}
4238
4239int ata_scsi_add_hosts(struct ata_host *host, struct scsi_host_template *sht)
4240{
4241 int i, rc;
4242
4243 for (i = 0; i < host->n_ports; i++) {
4244 struct ata_port *ap = host->ports[i];
4245 struct Scsi_Host *shost;
4246
4247 rc = -ENOMEM;
4248 shost = scsi_host_alloc(sht, sizeof(struct ata_port *));
4249 if (!shost)
4250 goto err_alloc;
4251
4252 shost->eh_noresume = 1;
4253 *(struct ata_port **)&shost->hostdata[0] = ap;
4254 ap->scsi_host = shost;
4255
4256 shost->transportt = ata_scsi_transport_template;
4257 shost->unique_id = ap->print_id;
4258 shost->max_id = 16;
4259 shost->max_lun = 1;
4260 shost->max_channel = 1;
4261 shost->max_cmd_len = 32;
4262
4263 /* Schedule policy is determined by ->qc_defer()
4264 * callback and it needs to see every deferred qc.
4265 * Set host_blocked to 1 to prevent SCSI midlayer from
4266 * automatically deferring requests.
4267 */
4268 shost->max_host_blocked = 1;
4269
4270 rc = scsi_add_host_with_dma(shost, &ap->tdev, ap->host->dev);
4271 if (rc)
4272 goto err_alloc;
4273 }
4274
4275 return 0;
4276
4277 err_alloc:
4278 while (--i >= 0) {
4279 struct Scsi_Host *shost = host->ports[i]->scsi_host;
4280
4281 /* scsi_host_put() is in ata_devres_release() */
4282 scsi_remove_host(shost);
4283 }
4284 return rc;
4285}
4286
4287#ifdef CONFIG_OF
4288static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
4289{
4290 struct scsi_device *sdev = dev->sdev;
4291 struct device *d = ap->host->dev;
4292 struct device_node *np = d->of_node;
4293 struct device_node *child;
4294
4295 for_each_available_child_of_node(np, child) {
4296 int ret;
4297 u32 val;
4298
4299 ret = of_property_read_u32(child, "reg", &val);
4300 if (ret)
4301 continue;
4302 if (val == dev->devno) {
4303 dev_dbg(d, "found matching device node\n");
4304 sdev->sdev_gendev.of_node = child;
4305 return;
4306 }
4307 }
4308}
4309#else
4310static void ata_scsi_assign_ofnode(struct ata_device *dev, struct ata_port *ap)
4311{
4312}
4313#endif
4314
4315void ata_scsi_scan_host(struct ata_port *ap, int sync)
4316{
4317 int tries = 5;
4318 struct ata_device *last_failed_dev = NULL;
4319 struct ata_link *link;
4320 struct ata_device *dev;
4321
4322 repeat:
4323 ata_for_each_link(link, ap, EDGE) {
4324 ata_for_each_dev(dev, link, ENABLED) {
4325 struct scsi_device *sdev;
4326 int channel = 0, id = 0;
4327
4328 if (dev->sdev)
4329 continue;
4330
4331 if (ata_is_host_link(link))
4332 id = dev->devno;
4333 else
4334 channel = link->pmp;
4335
4336 sdev = __scsi_add_device(ap->scsi_host, channel, id, 0,
4337 NULL);
4338 if (!IS_ERR(sdev)) {
4339 dev->sdev = sdev;
4340 ata_scsi_assign_ofnode(dev, ap);
4341 scsi_device_put(sdev);
4342 } else {
4343 dev->sdev = NULL;
4344 }
4345 }
4346 }
4347
4348 /* If we scanned while EH was in progress or allocation
4349 * failure occurred, scan would have failed silently. Check
4350 * whether all devices are attached.
4351 */
4352 ata_for_each_link(link, ap, EDGE) {
4353 ata_for_each_dev(dev, link, ENABLED) {
4354 if (!dev->sdev)
4355 goto exit_loop;
4356 }
4357 }
4358 exit_loop:
4359 if (!link)
4360 return;
4361
4362 /* we're missing some SCSI devices */
4363 if (sync) {
4364 /* If caller requested synchrnous scan && we've made
4365 * any progress, sleep briefly and repeat.
4366 */
4367 if (dev != last_failed_dev) {
4368 msleep(100);
4369 last_failed_dev = dev;
4370 goto repeat;
4371 }
4372
4373 /* We might be failing to detect boot device, give it
4374 * a few more chances.
4375 */
4376 if (--tries) {
4377 msleep(100);
4378 goto repeat;
4379 }
4380
4381 ata_port_err(ap,
4382 "WARNING: synchronous SCSI scan failed without making any progress, switching to async\n");
4383 }
4384
4385 queue_delayed_work(system_long_wq, &ap->hotplug_task,
4386 round_jiffies_relative(HZ));
4387}
4388
4389/**
4390 * ata_scsi_offline_dev - offline attached SCSI device
4391 * @dev: ATA device to offline attached SCSI device for
4392 *
4393 * This function is called from ata_eh_hotplug() and responsible
4394 * for taking the SCSI device attached to @dev offline. This
4395 * function is called with host lock which protects dev->sdev
4396 * against clearing.
4397 *
4398 * LOCKING:
4399 * spin_lock_irqsave(host lock)
4400 *
4401 * RETURNS:
4402 * 1 if attached SCSI device exists, 0 otherwise.
4403 */
4404int ata_scsi_offline_dev(struct ata_device *dev)
4405{
4406 if (dev->sdev) {
4407 scsi_device_set_state(dev->sdev, SDEV_OFFLINE);
4408 return 1;
4409 }
4410 return 0;
4411}
4412
4413/**
4414 * ata_scsi_remove_dev - remove attached SCSI device
4415 * @dev: ATA device to remove attached SCSI device for
4416 *
4417 * This function is called from ata_eh_scsi_hotplug() and
4418 * responsible for removing the SCSI device attached to @dev.
4419 *
4420 * LOCKING:
4421 * Kernel thread context (may sleep).
4422 */
4423static void ata_scsi_remove_dev(struct ata_device *dev)
4424{
4425 struct ata_port *ap = dev->link->ap;
4426 struct scsi_device *sdev;
4427 unsigned long flags;
4428
4429 /* Alas, we need to grab scan_mutex to ensure SCSI device
4430 * state doesn't change underneath us and thus
4431 * scsi_device_get() always succeeds. The mutex locking can
4432 * be removed if there is __scsi_device_get() interface which
4433 * increments reference counts regardless of device state.
4434 */
4435 mutex_lock(&ap->scsi_host->scan_mutex);
4436 spin_lock_irqsave(ap->lock, flags);
4437
4438 /* clearing dev->sdev is protected by host lock */
4439 sdev = dev->sdev;
4440 dev->sdev = NULL;
4441
4442 if (sdev) {
4443 /* If user initiated unplug races with us, sdev can go
4444 * away underneath us after the host lock and
4445 * scan_mutex are released. Hold onto it.
4446 */
4447 if (scsi_device_get(sdev) == 0) {
4448 /* The following ensures the attached sdev is
4449 * offline on return from ata_scsi_offline_dev()
4450 * regardless it wins or loses the race
4451 * against this function.
4452 */
4453 scsi_device_set_state(sdev, SDEV_OFFLINE);
4454 } else {
4455 WARN_ON(1);
4456 sdev = NULL;
4457 }
4458 }
4459
4460 spin_unlock_irqrestore(ap->lock, flags);
4461 mutex_unlock(&ap->scsi_host->scan_mutex);
4462
4463 if (sdev) {
4464 ata_dev_info(dev, "detaching (SCSI %s)\n",
4465 dev_name(&sdev->sdev_gendev));
4466
4467 scsi_remove_device(sdev);
4468 scsi_device_put(sdev);
4469 }
4470}
4471
4472static void ata_scsi_handle_link_detach(struct ata_link *link)
4473{
4474 struct ata_port *ap = link->ap;
4475 struct ata_device *dev;
4476
4477 ata_for_each_dev(dev, link, ALL) {
4478 unsigned long flags;
4479
4480 if (!(dev->flags & ATA_DFLAG_DETACHED))
4481 continue;
4482
4483 spin_lock_irqsave(ap->lock, flags);
4484 dev->flags &= ~ATA_DFLAG_DETACHED;
4485 spin_unlock_irqrestore(ap->lock, flags);
4486
4487 if (zpodd_dev_enabled(dev))
4488 zpodd_exit(dev);
4489
4490 ata_scsi_remove_dev(dev);
4491 }
4492}
4493
4494/**
4495 * ata_scsi_media_change_notify - send media change event
4496 * @dev: Pointer to the disk device with media change event
4497 *
4498 * Tell the block layer to send a media change notification
4499 * event.
4500 *
4501 * LOCKING:
4502 * spin_lock_irqsave(host lock)
4503 */
4504void ata_scsi_media_change_notify(struct ata_device *dev)
4505{
4506 if (dev->sdev)
4507 sdev_evt_send_simple(dev->sdev, SDEV_EVT_MEDIA_CHANGE,
4508 GFP_ATOMIC);
4509}
4510
4511/**
4512 * ata_scsi_hotplug - SCSI part of hotplug
4513 * @work: Pointer to ATA port to perform SCSI hotplug on
4514 *
4515 * Perform SCSI part of hotplug. It's executed from a separate
4516 * workqueue after EH completes. This is necessary because SCSI
4517 * hot plugging requires working EH and hot unplugging is
4518 * synchronized with hot plugging with a mutex.
4519 *
4520 * LOCKING:
4521 * Kernel thread context (may sleep).
4522 */
4523void ata_scsi_hotplug(struct work_struct *work)
4524{
4525 struct ata_port *ap =
4526 container_of(work, struct ata_port, hotplug_task.work);
4527 int i;
4528
4529 if (ap->pflags & ATA_PFLAG_UNLOADING) {
4530 DPRINTK("ENTER/EXIT - unloading\n");
4531 return;
4532 }
4533
4534 DPRINTK("ENTER\n");
4535 mutex_lock(&ap->scsi_scan_mutex);
4536
4537 /* Unplug detached devices. We cannot use link iterator here
4538 * because PMP links have to be scanned even if PMP is
4539 * currently not attached. Iterate manually.
4540 */
4541 ata_scsi_handle_link_detach(&ap->link);
4542 if (ap->pmp_link)
4543 for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
4544 ata_scsi_handle_link_detach(&ap->pmp_link[i]);
4545
4546 /* scan for new ones */
4547 ata_scsi_scan_host(ap, 0);
4548
4549 mutex_unlock(&ap->scsi_scan_mutex);
4550 DPRINTK("EXIT\n");
4551}
4552
4553/**
4554 * ata_scsi_user_scan - indication for user-initiated bus scan
4555 * @shost: SCSI host to scan
4556 * @channel: Channel to scan
4557 * @id: ID to scan
4558 * @lun: LUN to scan
4559 *
4560 * This function is called when user explicitly requests bus
4561 * scan. Set probe pending flag and invoke EH.
4562 *
4563 * LOCKING:
4564 * SCSI layer (we don't care)
4565 *
4566 * RETURNS:
4567 * Zero.
4568 */
4569int ata_scsi_user_scan(struct Scsi_Host *shost, unsigned int channel,
4570 unsigned int id, u64 lun)
4571{
4572 struct ata_port *ap = ata_shost_to_port(shost);
4573 unsigned long flags;
4574 int devno, rc = 0;
4575
4576 if (!ap->ops->error_handler)
4577 return -EOPNOTSUPP;
4578
4579 if (lun != SCAN_WILD_CARD && lun)
4580 return -EINVAL;
4581
4582 if (!sata_pmp_attached(ap)) {
4583 if (channel != SCAN_WILD_CARD && channel)
4584 return -EINVAL;
4585 devno = id;
4586 } else {
4587 if (id != SCAN_WILD_CARD && id)
4588 return -EINVAL;
4589 devno = channel;
4590 }
4591
4592 spin_lock_irqsave(ap->lock, flags);
4593
4594 if (devno == SCAN_WILD_CARD) {
4595 struct ata_link *link;
4596
4597 ata_for_each_link(link, ap, EDGE) {
4598 struct ata_eh_info *ehi = &link->eh_info;
4599 ehi->probe_mask |= ATA_ALL_DEVICES;
4600 ehi->action |= ATA_EH_RESET;
4601 }
4602 } else {
4603 struct ata_device *dev = ata_find_dev(ap, devno);
4604
4605 if (dev) {
4606 struct ata_eh_info *ehi = &dev->link->eh_info;
4607 ehi->probe_mask |= 1 << dev->devno;
4608 ehi->action |= ATA_EH_RESET;
4609 } else
4610 rc = -EINVAL;
4611 }
4612
4613 if (rc == 0) {
4614 ata_port_schedule_eh(ap);
4615 spin_unlock_irqrestore(ap->lock, flags);
4616 ata_port_wait_eh(ap);
4617 } else
4618 spin_unlock_irqrestore(ap->lock, flags);
4619
4620 return rc;
4621}
4622
4623/**
4624 * ata_scsi_dev_rescan - initiate scsi_rescan_device()
4625 * @work: Pointer to ATA port to perform scsi_rescan_device()
4626 *
4627 * After ATA pass thru (SAT) commands are executed successfully,
4628 * libata need to propagate the changes to SCSI layer.
4629 *
4630 * LOCKING:
4631 * Kernel thread context (may sleep).
4632 */
4633void ata_scsi_dev_rescan(struct work_struct *work)
4634{
4635 struct ata_port *ap =
4636 container_of(work, struct ata_port, scsi_rescan_task);
4637 struct ata_link *link;
4638 struct ata_device *dev;
4639 unsigned long flags;
4640
4641 mutex_lock(&ap->scsi_scan_mutex);
4642 spin_lock_irqsave(ap->lock, flags);
4643
4644 ata_for_each_link(link, ap, EDGE) {
4645 ata_for_each_dev(dev, link, ENABLED) {
4646 struct scsi_device *sdev = dev->sdev;
4647
4648 if (!sdev)
4649 continue;
4650 if (scsi_device_get(sdev))
4651 continue;
4652
4653 spin_unlock_irqrestore(ap->lock, flags);
4654 scsi_rescan_device(&(sdev->sdev_gendev));
4655 scsi_device_put(sdev);
4656 spin_lock_irqsave(ap->lock, flags);
4657 }
4658 }
4659
4660 spin_unlock_irqrestore(ap->lock, flags);
4661 mutex_unlock(&ap->scsi_scan_mutex);
4662}