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v4.10.11
 
   1/*
   2 *      sd.c Copyright (C) 1992 Drew Eckhardt
   3 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   4 *
   5 *      Linux scsi disk driver
   6 *              Initial versions: Drew Eckhardt
   7 *              Subsequent revisions: Eric Youngdale
   8 *	Modification history:
   9 *       - Drew Eckhardt <drew@colorado.edu> original
  10 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  11 *         outstanding request, and other enhancements.
  12 *         Support loadable low-level scsi drivers.
  13 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  14 *         eight major numbers.
  15 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  16 *	 - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  17 *	   sd_init and cleanups.
  18 *	 - Alex Davis <letmein@erols.com> Fix problem where partition info
  19 *	   not being read in sd_open. Fix problem where removable media 
  20 *	   could be ejected after sd_open.
  21 *	 - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  22 *	 - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  23 *	   <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  24 *	   Support 32k/1M disks.
  25 *
  26 *	Logging policy (needs CONFIG_SCSI_LOGGING defined):
  27 *	 - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  28 *	 - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  29 *	 - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  30 *	 - entering other commands: SCSI_LOG_HLQUEUE level 3
  31 *	Note: when the logging level is set by the user, it must be greater
  32 *	than the level indicated above to trigger output.	
  33 */
  34
  35#include <linux/module.h>
  36#include <linux/fs.h>
  37#include <linux/kernel.h>
  38#include <linux/mm.h>
  39#include <linux/bio.h>
  40#include <linux/genhd.h>
  41#include <linux/hdreg.h>
  42#include <linux/errno.h>
  43#include <linux/idr.h>
  44#include <linux/interrupt.h>
  45#include <linux/init.h>
  46#include <linux/blkdev.h>
  47#include <linux/blkpg.h>
 
  48#include <linux/delay.h>
  49#include <linux/mutex.h>
  50#include <linux/string_helpers.h>
  51#include <linux/async.h>
  52#include <linux/slab.h>
 
  53#include <linux/pm_runtime.h>
  54#include <linux/pr.h>
  55#include <linux/t10-pi.h>
  56#include <linux/uaccess.h>
  57#include <asm/unaligned.h>
  58
  59#include <scsi/scsi.h>
  60#include <scsi/scsi_cmnd.h>
  61#include <scsi/scsi_dbg.h>
  62#include <scsi/scsi_device.h>
  63#include <scsi/scsi_driver.h>
  64#include <scsi/scsi_eh.h>
  65#include <scsi/scsi_host.h>
  66#include <scsi/scsi_ioctl.h>
  67#include <scsi/scsicam.h>
  68
  69#include "sd.h"
  70#include "scsi_priv.h"
  71#include "scsi_logging.h"
  72
  73MODULE_AUTHOR("Eric Youngdale");
  74MODULE_DESCRIPTION("SCSI disk (sd) driver");
  75MODULE_LICENSE("GPL");
  76
  77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  93MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  94MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  95MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  96MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
  97
  98#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
  99#define SD_MINORS	16
 100#else
 101#define SD_MINORS	0
 102#endif
 103
 104static void sd_config_discard(struct scsi_disk *, unsigned int);
 105static void sd_config_write_same(struct scsi_disk *);
 106static int  sd_revalidate_disk(struct gendisk *);
 107static void sd_unlock_native_capacity(struct gendisk *disk);
 108static int  sd_probe(struct device *);
 109static int  sd_remove(struct device *);
 110static void sd_shutdown(struct device *);
 111static int sd_suspend_system(struct device *);
 112static int sd_suspend_runtime(struct device *);
 113static int sd_resume(struct device *);
 114static void sd_rescan(struct device *);
 115static int sd_init_command(struct scsi_cmnd *SCpnt);
 116static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 117static int sd_done(struct scsi_cmnd *);
 
 118static int sd_eh_action(struct scsi_cmnd *, int);
 119static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 120static void scsi_disk_release(struct device *cdev);
 121static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 122static void sd_print_result(const struct scsi_disk *, const char *, int);
 123
 124static DEFINE_SPINLOCK(sd_index_lock);
 125static DEFINE_IDA(sd_index_ida);
 126
 127/* This semaphore is used to mediate the 0->1 reference get in the
 128 * face of object destruction (i.e. we can't allow a get on an
 129 * object after last put) */
 130static DEFINE_MUTEX(sd_ref_mutex);
 131
 132static struct kmem_cache *sd_cdb_cache;
 133static mempool_t *sd_cdb_pool;
 
 134
 135static const char *sd_cache_types[] = {
 136	"write through", "none", "write back",
 137	"write back, no read (daft)"
 138};
 139
 140static void sd_set_flush_flag(struct scsi_disk *sdkp)
 141{
 142	bool wc = false, fua = false;
 143
 144	if (sdkp->WCE) {
 145		wc = true;
 146		if (sdkp->DPOFUA)
 147			fua = true;
 148	}
 149
 150	blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 151}
 152
 153static ssize_t
 154cache_type_store(struct device *dev, struct device_attribute *attr,
 155		 const char *buf, size_t count)
 156{
 157	int i, ct = -1, rcd, wce, sp;
 158	struct scsi_disk *sdkp = to_scsi_disk(dev);
 159	struct scsi_device *sdp = sdkp->device;
 160	char buffer[64];
 161	char *buffer_data;
 162	struct scsi_mode_data data;
 163	struct scsi_sense_hdr sshdr;
 164	static const char temp[] = "temporary ";
 165	int len;
 166
 167	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 168		/* no cache control on RBC devices; theoretically they
 169		 * can do it, but there's probably so many exceptions
 170		 * it's not worth the risk */
 171		return -EINVAL;
 172
 173	if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 174		buf += sizeof(temp) - 1;
 175		sdkp->cache_override = 1;
 176	} else {
 177		sdkp->cache_override = 0;
 178	}
 179
 180	for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
 181		len = strlen(sd_cache_types[i]);
 182		if (strncmp(sd_cache_types[i], buf, len) == 0 &&
 183		    buf[len] == '\n') {
 184			ct = i;
 185			break;
 186		}
 187	}
 188	if (ct < 0)
 189		return -EINVAL;
 
 190	rcd = ct & 0x01 ? 1 : 0;
 191	wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 192
 193	if (sdkp->cache_override) {
 194		sdkp->WCE = wce;
 195		sdkp->RCD = rcd;
 196		sd_set_flush_flag(sdkp);
 197		return count;
 198	}
 199
 200	if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 201			    SD_MAX_RETRIES, &data, NULL))
 202		return -EINVAL;
 203	len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 204		  data.block_descriptor_length);
 205	buffer_data = buffer + data.header_length +
 206		data.block_descriptor_length;
 207	buffer_data[2] &= ~0x05;
 208	buffer_data[2] |= wce << 2 | rcd;
 209	sp = buffer_data[0] & 0x80 ? 1 : 0;
 210	buffer_data[0] &= ~0x80;
 211
 
 
 
 
 
 
 212	if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 213			     SD_MAX_RETRIES, &data, &sshdr)) {
 214		if (scsi_sense_valid(&sshdr))
 215			sd_print_sense_hdr(sdkp, &sshdr);
 216		return -EINVAL;
 217	}
 218	revalidate_disk(sdkp->disk);
 219	return count;
 220}
 221
 222static ssize_t
 223manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 224		       char *buf)
 225{
 226	struct scsi_disk *sdkp = to_scsi_disk(dev);
 227	struct scsi_device *sdp = sdkp->device;
 228
 229	return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
 230}
 231
 232static ssize_t
 233manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 234			const char *buf, size_t count)
 235{
 236	struct scsi_disk *sdkp = to_scsi_disk(dev);
 237	struct scsi_device *sdp = sdkp->device;
 
 238
 239	if (!capable(CAP_SYS_ADMIN))
 240		return -EACCES;
 241
 242	sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
 
 
 
 243
 244	return count;
 245}
 246static DEVICE_ATTR_RW(manage_start_stop);
 247
 248static ssize_t
 249allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 250{
 251	struct scsi_disk *sdkp = to_scsi_disk(dev);
 252
 253	return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
 254}
 255
 256static ssize_t
 257allow_restart_store(struct device *dev, struct device_attribute *attr,
 258		    const char *buf, size_t count)
 259{
 
 260	struct scsi_disk *sdkp = to_scsi_disk(dev);
 261	struct scsi_device *sdp = sdkp->device;
 262
 263	if (!capable(CAP_SYS_ADMIN))
 264		return -EACCES;
 265
 266	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 267		return -EINVAL;
 268
 269	sdp->allow_restart = simple_strtoul(buf, NULL, 10);
 
 
 
 270
 271	return count;
 272}
 273static DEVICE_ATTR_RW(allow_restart);
 274
 275static ssize_t
 276cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 277{
 278	struct scsi_disk *sdkp = to_scsi_disk(dev);
 279	int ct = sdkp->RCD + 2*sdkp->WCE;
 280
 281	return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
 282}
 283static DEVICE_ATTR_RW(cache_type);
 284
 285static ssize_t
 286FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 287{
 288	struct scsi_disk *sdkp = to_scsi_disk(dev);
 289
 290	return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
 291}
 292static DEVICE_ATTR_RO(FUA);
 293
 294static ssize_t
 295protection_type_show(struct device *dev, struct device_attribute *attr,
 296		     char *buf)
 297{
 298	struct scsi_disk *sdkp = to_scsi_disk(dev);
 299
 300	return snprintf(buf, 20, "%u\n", sdkp->protection_type);
 301}
 302
 303static ssize_t
 304protection_type_store(struct device *dev, struct device_attribute *attr,
 305		      const char *buf, size_t count)
 306{
 307	struct scsi_disk *sdkp = to_scsi_disk(dev);
 308	unsigned int val;
 309	int err;
 310
 311	if (!capable(CAP_SYS_ADMIN))
 312		return -EACCES;
 313
 314	err = kstrtouint(buf, 10, &val);
 315
 316	if (err)
 317		return err;
 318
 319	if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
 320		sdkp->protection_type = val;
 321
 322	return count;
 323}
 324static DEVICE_ATTR_RW(protection_type);
 325
 326static ssize_t
 327protection_mode_show(struct device *dev, struct device_attribute *attr,
 328		     char *buf)
 329{
 330	struct scsi_disk *sdkp = to_scsi_disk(dev);
 331	struct scsi_device *sdp = sdkp->device;
 332	unsigned int dif, dix;
 333
 334	dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 335	dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 336
 337	if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 338		dif = 0;
 339		dix = 1;
 340	}
 341
 342	if (!dif && !dix)
 343		return snprintf(buf, 20, "none\n");
 344
 345	return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
 346}
 347static DEVICE_ATTR_RO(protection_mode);
 348
 349static ssize_t
 350app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 351{
 352	struct scsi_disk *sdkp = to_scsi_disk(dev);
 353
 354	return snprintf(buf, 20, "%u\n", sdkp->ATO);
 355}
 356static DEVICE_ATTR_RO(app_tag_own);
 357
 358static ssize_t
 359thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 360		       char *buf)
 361{
 362	struct scsi_disk *sdkp = to_scsi_disk(dev);
 363
 364	return snprintf(buf, 20, "%u\n", sdkp->lbpme);
 365}
 366static DEVICE_ATTR_RO(thin_provisioning);
 367
 
 368static const char *lbp_mode[] = {
 369	[SD_LBP_FULL]		= "full",
 370	[SD_LBP_UNMAP]		= "unmap",
 371	[SD_LBP_WS16]		= "writesame_16",
 372	[SD_LBP_WS10]		= "writesame_10",
 373	[SD_LBP_ZERO]		= "writesame_zero",
 374	[SD_LBP_DISABLE]	= "disabled",
 375};
 376
 377static ssize_t
 378provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 379		       char *buf)
 380{
 381	struct scsi_disk *sdkp = to_scsi_disk(dev);
 382
 383	return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 384}
 385
 386static ssize_t
 387provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 388			const char *buf, size_t count)
 389{
 390	struct scsi_disk *sdkp = to_scsi_disk(dev);
 391	struct scsi_device *sdp = sdkp->device;
 
 392
 393	if (!capable(CAP_SYS_ADMIN))
 394		return -EACCES;
 395
 396	if (sd_is_zoned(sdkp)) {
 397		sd_config_discard(sdkp, SD_LBP_DISABLE);
 398		return count;
 399	}
 400
 401	if (sdp->type != TYPE_DISK)
 402		return -EINVAL;
 403
 404	if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
 405		sd_config_discard(sdkp, SD_LBP_UNMAP);
 406	else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
 407		sd_config_discard(sdkp, SD_LBP_WS16);
 408	else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
 409		sd_config_discard(sdkp, SD_LBP_WS10);
 410	else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
 411		sd_config_discard(sdkp, SD_LBP_ZERO);
 412	else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
 413		sd_config_discard(sdkp, SD_LBP_DISABLE);
 414	else
 415		return -EINVAL;
 416
 
 
 417	return count;
 418}
 419static DEVICE_ATTR_RW(provisioning_mode);
 420
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 421static ssize_t
 422max_medium_access_timeouts_show(struct device *dev,
 423				struct device_attribute *attr, char *buf)
 424{
 425	struct scsi_disk *sdkp = to_scsi_disk(dev);
 426
 427	return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
 428}
 429
 430static ssize_t
 431max_medium_access_timeouts_store(struct device *dev,
 432				 struct device_attribute *attr, const char *buf,
 433				 size_t count)
 434{
 435	struct scsi_disk *sdkp = to_scsi_disk(dev);
 436	int err;
 437
 438	if (!capable(CAP_SYS_ADMIN))
 439		return -EACCES;
 440
 441	err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 442
 443	return err ? err : count;
 444}
 445static DEVICE_ATTR_RW(max_medium_access_timeouts);
 446
 447static ssize_t
 448max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 449			   char *buf)
 450{
 451	struct scsi_disk *sdkp = to_scsi_disk(dev);
 452
 453	return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
 454}
 455
 456static ssize_t
 457max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 458			    const char *buf, size_t count)
 459{
 460	struct scsi_disk *sdkp = to_scsi_disk(dev);
 461	struct scsi_device *sdp = sdkp->device;
 462	unsigned long max;
 463	int err;
 464
 465	if (!capable(CAP_SYS_ADMIN))
 466		return -EACCES;
 467
 468	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 469		return -EINVAL;
 470
 471	err = kstrtoul(buf, 10, &max);
 472
 473	if (err)
 474		return err;
 475
 476	if (max == 0)
 477		sdp->no_write_same = 1;
 478	else if (max <= SD_MAX_WS16_BLOCKS) {
 479		sdp->no_write_same = 0;
 480		sdkp->max_ws_blocks = max;
 481	}
 482
 483	sd_config_write_same(sdkp);
 484
 485	return count;
 486}
 487static DEVICE_ATTR_RW(max_write_same_blocks);
 488
 489static struct attribute *sd_disk_attrs[] = {
 490	&dev_attr_cache_type.attr,
 491	&dev_attr_FUA.attr,
 492	&dev_attr_allow_restart.attr,
 493	&dev_attr_manage_start_stop.attr,
 494	&dev_attr_protection_type.attr,
 495	&dev_attr_protection_mode.attr,
 496	&dev_attr_app_tag_own.attr,
 497	&dev_attr_thin_provisioning.attr,
 498	&dev_attr_provisioning_mode.attr,
 
 499	&dev_attr_max_write_same_blocks.attr,
 500	&dev_attr_max_medium_access_timeouts.attr,
 501	NULL,
 502};
 503ATTRIBUTE_GROUPS(sd_disk);
 504
 505static struct class sd_disk_class = {
 506	.name		= "scsi_disk",
 507	.owner		= THIS_MODULE,
 508	.dev_release	= scsi_disk_release,
 509	.dev_groups	= sd_disk_groups,
 510};
 511
 512static const struct dev_pm_ops sd_pm_ops = {
 513	.suspend		= sd_suspend_system,
 514	.resume			= sd_resume,
 515	.poweroff		= sd_suspend_system,
 516	.restore		= sd_resume,
 517	.runtime_suspend	= sd_suspend_runtime,
 518	.runtime_resume		= sd_resume,
 519};
 520
 521static struct scsi_driver sd_template = {
 522	.gendrv = {
 523		.name		= "sd",
 524		.owner		= THIS_MODULE,
 525		.probe		= sd_probe,
 
 526		.remove		= sd_remove,
 527		.shutdown	= sd_shutdown,
 528		.pm		= &sd_pm_ops,
 529	},
 530	.rescan			= sd_rescan,
 531	.init_command		= sd_init_command,
 532	.uninit_command		= sd_uninit_command,
 533	.done			= sd_done,
 534	.eh_action		= sd_eh_action,
 
 535};
 536
 537/*
 538 * Dummy kobj_map->probe function.
 539 * The default ->probe function will call modprobe, which is
 540 * pointless as this module is already loaded.
 541 */
 542static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 543{
 544	return NULL;
 545}
 546
 547/*
 548 * Device no to disk mapping:
 549 * 
 550 *       major         disc2     disc  p1
 551 *   |............|.............|....|....| <- dev_t
 552 *    31        20 19          8 7  4 3  0
 553 * 
 554 * Inside a major, we have 16k disks, however mapped non-
 555 * contiguously. The first 16 disks are for major0, the next
 556 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 557 * for major1, ... 
 558 * As we stay compatible with our numbering scheme, we can reuse 
 559 * the well-know SCSI majors 8, 65--71, 136--143.
 560 */
 561static int sd_major(int major_idx)
 562{
 563	switch (major_idx) {
 564	case 0:
 565		return SCSI_DISK0_MAJOR;
 566	case 1 ... 7:
 567		return SCSI_DISK1_MAJOR + major_idx - 1;
 568	case 8 ... 15:
 569		return SCSI_DISK8_MAJOR + major_idx - 8;
 570	default:
 571		BUG();
 572		return 0;	/* shut up gcc */
 573	}
 574}
 575
 576static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 577{
 578	struct scsi_disk *sdkp = NULL;
 579
 580	mutex_lock(&sd_ref_mutex);
 581
 582	if (disk->private_data) {
 583		sdkp = scsi_disk(disk);
 584		if (scsi_device_get(sdkp->device) == 0)
 585			get_device(&sdkp->dev);
 586		else
 587			sdkp = NULL;
 588	}
 589	mutex_unlock(&sd_ref_mutex);
 590	return sdkp;
 591}
 592
 593static void scsi_disk_put(struct scsi_disk *sdkp)
 594{
 595	struct scsi_device *sdev = sdkp->device;
 596
 597	mutex_lock(&sd_ref_mutex);
 598	put_device(&sdkp->dev);
 599	scsi_device_put(sdev);
 600	mutex_unlock(&sd_ref_mutex);
 601}
 602
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 603static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 604					   unsigned int dix, unsigned int dif)
 605{
 606	struct bio *bio = scmd->request->bio;
 607	unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 608	unsigned int protect = 0;
 609
 610	if (dix) {				/* DIX Type 0, 1, 2, 3 */
 611		if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 612			scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 613
 614		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 615			scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 616	}
 617
 618	if (dif != T10_PI_TYPE3_PROTECTION) {	/* DIX/DIF Type 0, 1, 2 */
 619		scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 620
 621		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 622			scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 623	}
 624
 625	if (dif) {				/* DIX/DIF Type 1, 2, 3 */
 626		scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 627
 628		if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 629			protect = 3 << 5;	/* Disable target PI checking */
 630		else
 631			protect = 1 << 5;	/* Enable target PI checking */
 632	}
 633
 634	scsi_set_prot_op(scmd, prot_op);
 635	scsi_set_prot_type(scmd, dif);
 636	scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 637
 638	return protect;
 639}
 640
 641static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 642{
 643	struct request_queue *q = sdkp->disk->queue;
 644	unsigned int logical_block_size = sdkp->device->sector_size;
 645	unsigned int max_blocks = 0;
 646
 647	q->limits.discard_zeroes_data = 0;
 648
 649	/*
 650	 * When LBPRZ is reported, discard alignment and granularity
 651	 * must be fixed to the logical block size. Otherwise the block
 652	 * layer will drop misaligned portions of the request which can
 653	 * lead to data corruption. If LBPRZ is not set, we honor the
 654	 * device preference.
 655	 */
 656	if (sdkp->lbprz) {
 657		q->limits.discard_alignment = 0;
 658		q->limits.discard_granularity = logical_block_size;
 659	} else {
 660		q->limits.discard_alignment = sdkp->unmap_alignment *
 661			logical_block_size;
 662		q->limits.discard_granularity =
 663			max(sdkp->physical_block_size,
 664			    sdkp->unmap_granularity * logical_block_size);
 665	}
 666
 667	sdkp->provisioning_mode = mode;
 668
 669	switch (mode) {
 670
 
 671	case SD_LBP_DISABLE:
 672		blk_queue_max_discard_sectors(q, 0);
 673		queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
 674		return;
 675
 676	case SD_LBP_UNMAP:
 677		max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 678					  (u32)SD_MAX_WS16_BLOCKS);
 679		break;
 680
 681	case SD_LBP_WS16:
 682		max_blocks = min_not_zero(sdkp->max_ws_blocks,
 683					  (u32)SD_MAX_WS16_BLOCKS);
 684		q->limits.discard_zeroes_data = sdkp->lbprz;
 
 
 
 685		break;
 686
 687	case SD_LBP_WS10:
 688		max_blocks = min_not_zero(sdkp->max_ws_blocks,
 689					  (u32)SD_MAX_WS10_BLOCKS);
 690		q->limits.discard_zeroes_data = sdkp->lbprz;
 
 
 
 691		break;
 692
 693	case SD_LBP_ZERO:
 694		max_blocks = min_not_zero(sdkp->max_ws_blocks,
 695					  (u32)SD_MAX_WS10_BLOCKS);
 696		q->limits.discard_zeroes_data = 1;
 697		break;
 698	}
 699
 700	blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 701	queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
 702}
 703
 704/**
 705 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
 706 * @sdp: scsi device to operate one
 707 * @rq: Request to prepare
 708 *
 709 * Will issue either UNMAP or WRITE SAME(16) depending on preference
 710 * indicated by target device.
 711 **/
 712static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
 713{
 714	struct request *rq = cmd->request;
 715	struct scsi_device *sdp = cmd->device;
 716	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 717	sector_t sector = blk_rq_pos(rq);
 718	unsigned int nr_sectors = blk_rq_sectors(rq);
 719	unsigned int len;
 720	int ret;
 721	char *buf;
 722	struct page *page;
 723
 724	sector >>= ilog2(sdp->sector_size) - 9;
 725	nr_sectors >>= ilog2(sdp->sector_size) - 9;
 
 
 
 
 
 726
 727	page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
 728	if (!page)
 729		return BLKPREP_DEFER;
 730
 731	switch (sdkp->provisioning_mode) {
 732	case SD_LBP_UNMAP:
 733		buf = page_address(page);
 
 
 734
 735		cmd->cmd_len = 10;
 736		cmd->cmnd[0] = UNMAP;
 737		cmd->cmnd[8] = 24;
 738
 739		put_unaligned_be16(6 + 16, &buf[0]);
 740		put_unaligned_be16(16, &buf[2]);
 741		put_unaligned_be64(sector, &buf[8]);
 742		put_unaligned_be32(nr_sectors, &buf[16]);
 743
 744		len = 24;
 745		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 746
 747	case SD_LBP_WS16:
 748		cmd->cmd_len = 16;
 749		cmd->cmnd[0] = WRITE_SAME_16;
 750		cmd->cmnd[1] = 0x8; /* UNMAP */
 751		put_unaligned_be64(sector, &cmd->cmnd[2]);
 752		put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 753
 754		len = sdkp->device->sector_size;
 755		break;
 756
 757	case SD_LBP_WS10:
 758	case SD_LBP_ZERO:
 759		cmd->cmd_len = 10;
 760		cmd->cmnd[0] = WRITE_SAME;
 761		if (sdkp->provisioning_mode == SD_LBP_WS10)
 762			cmd->cmnd[1] = 0x8; /* UNMAP */
 763		put_unaligned_be32(sector, &cmd->cmnd[2]);
 764		put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 765
 766		len = sdkp->device->sector_size;
 767		break;
 768
 769	default:
 770		ret = BLKPREP_INVALID;
 771		goto out;
 772	}
 
 
 
 
 
 
 
 
 
 
 
 
 773
 774	rq->timeout = SD_TIMEOUT;
 
 
 
 
 
 775
 776	cmd->transfersize = len;
 777	cmd->allowed = SD_MAX_RETRIES;
 
 
 778
 779	rq->special_vec.bv_page = page;
 780	rq->special_vec.bv_offset = 0;
 781	rq->special_vec.bv_len = len;
 782
 783	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 784	rq->resid_len = len;
 
 
 
 
 
 785
 786	ret = scsi_init_io(cmd);
 787out:
 788	if (ret != BLKPREP_OK)
 789		__free_page(page);
 790	return ret;
 
 
 
 
 
 
 
 
 
 
 
 791}
 792
 793static void sd_config_write_same(struct scsi_disk *sdkp)
 794{
 795	struct request_queue *q = sdkp->disk->queue;
 796	unsigned int logical_block_size = sdkp->device->sector_size;
 797
 798	if (sdkp->device->no_write_same) {
 799		sdkp->max_ws_blocks = 0;
 800		goto out;
 801	}
 802
 803	/* Some devices can not handle block counts above 0xffff despite
 804	 * supporting WRITE SAME(16). Consequently we default to 64k
 805	 * blocks per I/O unless the device explicitly advertises a
 806	 * bigger limit.
 807	 */
 808	if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 809		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 810						   (u32)SD_MAX_WS16_BLOCKS);
 811	else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 812		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 813						   (u32)SD_MAX_WS10_BLOCKS);
 814	else {
 815		sdkp->device->no_write_same = 1;
 816		sdkp->max_ws_blocks = 0;
 817	}
 818
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 819out:
 820	blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
 821					 (logical_block_size >> 9));
 
 
 822}
 823
 824/**
 825 * sd_setup_write_same_cmnd - write the same data to multiple blocks
 826 * @cmd: command to prepare
 827 *
 828 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
 829 * preference indicated by target device.
 830 **/
 831static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
 832{
 833	struct request *rq = cmd->request;
 834	struct scsi_device *sdp = cmd->device;
 835	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 836	struct bio *bio = rq->bio;
 837	sector_t sector = blk_rq_pos(rq);
 838	unsigned int nr_sectors = blk_rq_sectors(rq);
 839	unsigned int nr_bytes = blk_rq_bytes(rq);
 840	int ret;
 841
 842	if (sdkp->device->no_write_same)
 843		return BLKPREP_INVALID;
 844
 845	BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
 846
 847	if (sd_is_zoned(sdkp)) {
 848		ret = sd_zbc_setup_write_cmnd(cmd);
 849		if (ret != BLKPREP_OK)
 850			return ret;
 851	}
 852
 853	sector >>= ilog2(sdp->sector_size) - 9;
 854	nr_sectors >>= ilog2(sdp->sector_size) - 9;
 855
 856	rq->timeout = SD_WRITE_SAME_TIMEOUT;
 857
 858	if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
 859		cmd->cmd_len = 16;
 860		cmd->cmnd[0] = WRITE_SAME_16;
 861		put_unaligned_be64(sector, &cmd->cmnd[2]);
 862		put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
 863	} else {
 864		cmd->cmd_len = 10;
 865		cmd->cmnd[0] = WRITE_SAME;
 866		put_unaligned_be32(sector, &cmd->cmnd[2]);
 867		put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
 868	}
 869
 870	cmd->transfersize = sdp->sector_size;
 871	cmd->allowed = SD_MAX_RETRIES;
 872
 873	/*
 874	 * For WRITE SAME the data transferred via the DATA OUT buffer is
 875	 * different from the amount of data actually written to the target.
 876	 *
 877	 * We set up __data_len to the amount of data transferred via the
 878	 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
 879	 * to transfer a single sector of data first, but then reset it to
 880	 * the amount of data to be written right after so that the I/O path
 881	 * knows how much to actually write.
 882	 */
 883	rq->__data_len = sdp->sector_size;
 884	ret = scsi_init_io(cmd);
 885	rq->__data_len = nr_bytes;
 
 886	return ret;
 887}
 888
 889static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
 890{
 891	struct request *rq = cmd->request;
 892
 893	/* flush requests don't perform I/O, zero the S/G table */
 894	memset(&cmd->sdb, 0, sizeof(cmd->sdb));
 895
 896	cmd->cmnd[0] = SYNCHRONIZE_CACHE;
 897	cmd->cmd_len = 10;
 898	cmd->transfersize = 0;
 899	cmd->allowed = SD_MAX_RETRIES;
 900
 901	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
 902	return BLKPREP_OK;
 903}
 904
 905static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
 
 
 906{
 907	struct request *rq = SCpnt->request;
 908	struct scsi_device *sdp = SCpnt->device;
 909	struct gendisk *disk = rq->rq_disk;
 910	struct scsi_disk *sdkp = scsi_disk(disk);
 911	sector_t block = blk_rq_pos(rq);
 912	sector_t threshold;
 913	unsigned int this_count = blk_rq_sectors(rq);
 914	unsigned int dif, dix;
 915	bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
 916	int ret;
 917	unsigned char protect;
 918
 919	if (zoned_write) {
 920		ret = sd_zbc_setup_write_cmnd(SCpnt);
 921		if (ret != BLKPREP_OK)
 922			return ret;
 923	}
 924
 925	ret = scsi_init_io(SCpnt);
 926	if (ret != BLKPREP_OK)
 927		goto out;
 928	SCpnt = rq->special;
 
 
 
 929
 930	/* from here on until we're complete, any goto out
 931	 * is used for a killable error condition */
 932	ret = BLKPREP_KILL;
 933
 934	SCSI_LOG_HLQUEUE(1,
 935		scmd_printk(KERN_INFO, SCpnt,
 936			"%s: block=%llu, count=%d\n",
 937			__func__, (unsigned long long)block, this_count));
 938
 939	if (!sdp || !scsi_device_online(sdp) ||
 940	    block + blk_rq_sectors(rq) > get_capacity(disk)) {
 941		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 942						"Finishing %u sectors\n",
 943						blk_rq_sectors(rq)));
 944		SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
 945						"Retry with 0x%p\n", SCpnt));
 946		goto out;
 947	}
 948
 949	if (sdp->changed) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 950		/*
 951		 * quietly refuse to do anything to a changed disc until 
 952		 * the changed bit has been reset
 
 953		 */
 954		/* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
 955		goto out;
 956	}
 957
 958	/*
 959	 * Some SD card readers can't handle multi-sector accesses which touch
 960	 * the last one or two hardware sectors.  Split accesses as needed.
 961	 */
 962	threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
 963		(sdp->sector_size / 512);
 
 964
 965	if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
 966		if (block < threshold) {
 967			/* Access up to the threshold but not beyond */
 968			this_count = threshold - block;
 969		} else {
 970			/* Access only a single hardware sector */
 971			this_count = sdp->sector_size / 512;
 972		}
 973	}
 974
 975	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
 976					(unsigned long long)block));
 
 
 
 
 
 
 
 
 
 
 
 
 977
 978	/*
 979	 * If we have a 1K hardware sectorsize, prevent access to single
 980	 * 512 byte sectors.  In theory we could handle this - in fact
 981	 * the scsi cdrom driver must be able to handle this because
 982	 * we typically use 1K blocksizes, and cdroms typically have
 983	 * 2K hardware sectorsizes.  Of course, things are simpler
 984	 * with the cdrom, since it is read-only.  For performance
 985	 * reasons, the filesystems should be able to handle this
 986	 * and not force the scsi disk driver to use bounce buffers
 987	 * for this.
 988	 */
 989	if (sdp->sector_size == 1024) {
 990		if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
 991			scmd_printk(KERN_ERR, SCpnt,
 992				    "Bad block number requested\n");
 993			goto out;
 994		} else {
 995			block = block >> 1;
 996			this_count = this_count >> 1;
 997		}
 998	}
 999	if (sdp->sector_size == 2048) {
1000		if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1001			scmd_printk(KERN_ERR, SCpnt,
1002				    "Bad block number requested\n");
1003			goto out;
1004		} else {
1005			block = block >> 2;
1006			this_count = this_count >> 2;
1007		}
1008	}
1009	if (sdp->sector_size == 4096) {
1010		if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1011			scmd_printk(KERN_ERR, SCpnt,
1012				    "Bad block number requested\n");
1013			goto out;
1014		} else {
1015			block = block >> 3;
1016			this_count = this_count >> 3;
1017		}
1018	}
1019	if (rq_data_dir(rq) == WRITE) {
1020		SCpnt->cmnd[0] = WRITE_6;
1021
1022		if (blk_integrity_rq(rq))
1023			sd_dif_prepare(SCpnt);
 
 
 
1024
1025	} else if (rq_data_dir(rq) == READ) {
1026		SCpnt->cmnd[0] = READ_6;
1027	} else {
1028		scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1029		goto out;
 
 
 
1030	}
1031
1032	SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1033					"%s %d/%u 512 byte blocks.\n",
1034					(rq_data_dir(rq) == WRITE) ?
1035					"writing" : "reading", this_count,
1036					blk_rq_sectors(rq)));
1037
1038	dix = scsi_prot_sg_count(SCpnt);
1039	dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1040
1041	if (dif || dix)
1042		protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1043	else
1044		protect = 0;
1045
1046	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1047		SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1048
1049		if (unlikely(SCpnt->cmnd == NULL)) {
1050			ret = BLKPREP_DEFER;
1051			goto out;
1052		}
1053
1054		SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1055		memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1056		SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1057		SCpnt->cmnd[7] = 0x18;
1058		SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1059		SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1060
1061		/* LBA */
1062		SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063		SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064		SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065		SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066		SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1067		SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1068		SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1069		SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1070
1071		/* Expected Indirect LBA */
1072		SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1073		SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1074		SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1075		SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1076
1077		/* Transfer length */
1078		SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1079		SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1080		SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1081		SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1082	} else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1083		SCpnt->cmnd[0] += READ_16 - READ_6;
1084		SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1085		SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1086		SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1087		SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1088		SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1089		SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1090		SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1091		SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1092		SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1093		SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1094		SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1095		SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1096		SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1097		SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1098	} else if ((this_count > 0xff) || (block > 0x1fffff) ||
1099		   scsi_device_protection(SCpnt->device) ||
1100		   SCpnt->device->use_10_for_rw) {
1101		SCpnt->cmnd[0] += READ_10 - READ_6;
1102		SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1103		SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1104		SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1105		SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1106		SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1107		SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1108		SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1109		SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1110	} else {
1111		if (unlikely(rq->cmd_flags & REQ_FUA)) {
1112			/*
1113			 * This happens only if this drive failed
1114			 * 10byte rw command with ILLEGAL_REQUEST
1115			 * during operation and thus turned off
1116			 * use_10_for_rw.
1117			 */
1118			scmd_printk(KERN_ERR, SCpnt,
1119				    "FUA write on READ/WRITE(6) drive\n");
1120			goto out;
1121		}
1122
1123		SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1124		SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1125		SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1126		SCpnt->cmnd[4] = (unsigned char) this_count;
1127		SCpnt->cmnd[5] = 0;
1128	}
1129	SCpnt->sdb.length = this_count * sdp->sector_size;
 
 
1130
1131	/*
1132	 * We shouldn't disconnect in the middle of a sector, so with a dumb
1133	 * host adapter, it's safe to assume that we can at least transfer
1134	 * this many bytes between each connect / disconnect.
1135	 */
1136	SCpnt->transfersize = sdp->sector_size;
1137	SCpnt->underflow = this_count << 9;
1138	SCpnt->allowed = SD_MAX_RETRIES;
 
 
 
 
 
 
 
 
 
 
 
 
1139
1140	/*
1141	 * This indicates that the command is ready from our end to be
1142	 * queued.
1143	 */
1144	ret = BLKPREP_OK;
1145 out:
1146	if (zoned_write && ret != BLKPREP_OK)
1147		sd_zbc_cancel_write_cmnd(SCpnt);
1148
1149	return ret;
1150}
1151
1152static int sd_init_command(struct scsi_cmnd *cmd)
1153{
1154	struct request *rq = cmd->request;
1155
1156	switch (req_op(rq)) {
1157	case REQ_OP_DISCARD:
1158		return sd_setup_discard_cmnd(cmd);
 
 
 
 
 
 
 
 
 
 
 
 
 
1159	case REQ_OP_WRITE_SAME:
1160		return sd_setup_write_same_cmnd(cmd);
1161	case REQ_OP_FLUSH:
1162		return sd_setup_flush_cmnd(cmd);
1163	case REQ_OP_READ:
1164	case REQ_OP_WRITE:
1165		return sd_setup_read_write_cmnd(cmd);
1166	case REQ_OP_ZONE_REPORT:
1167		return sd_zbc_setup_report_cmnd(cmd);
1168	case REQ_OP_ZONE_RESET:
1169		return sd_zbc_setup_reset_cmnd(cmd);
 
 
1170	default:
1171		BUG();
 
1172	}
1173}
1174
1175static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1176{
1177	struct request *rq = SCpnt->request;
 
1178
1179	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1180		__free_page(rq->special_vec.bv_page);
1181
1182	if (SCpnt->cmnd != rq->cmd) {
1183		mempool_free(SCpnt->cmnd, sd_cdb_pool);
1184		SCpnt->cmnd = NULL;
1185		SCpnt->cmd_len = 0;
 
1186	}
1187}
1188
1189/**
1190 *	sd_open - open a scsi disk device
1191 *	@inode: only i_rdev member may be used
1192 *	@filp: only f_mode and f_flags may be used
1193 *
1194 *	Returns 0 if successful. Returns a negated errno value in case 
1195 *	of error.
1196 *
1197 *	Note: This can be called from a user context (e.g. fsck(1) )
1198 *	or from within the kernel (e.g. as a result of a mount(1) ).
1199 *	In the latter case @inode and @filp carry an abridged amount
1200 *	of information as noted above.
1201 *
1202 *	Locking: called with bdev->bd_mutex held.
1203 **/
1204static int sd_open(struct block_device *bdev, fmode_t mode)
1205{
1206	struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1207	struct scsi_device *sdev;
1208	int retval;
1209
1210	if (!sdkp)
1211		return -ENXIO;
1212
1213	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1214
1215	sdev = sdkp->device;
1216
1217	/*
1218	 * If the device is in error recovery, wait until it is done.
1219	 * If the device is offline, then disallow any access to it.
1220	 */
1221	retval = -ENXIO;
1222	if (!scsi_block_when_processing_errors(sdev))
1223		goto error_out;
1224
1225	if (sdev->removable || sdkp->write_prot)
1226		check_disk_change(bdev);
1227
1228	/*
1229	 * If the drive is empty, just let the open fail.
1230	 */
1231	retval = -ENOMEDIUM;
1232	if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1233		goto error_out;
1234
1235	/*
1236	 * If the device has the write protect tab set, have the open fail
1237	 * if the user expects to be able to write to the thing.
1238	 */
1239	retval = -EROFS;
1240	if (sdkp->write_prot && (mode & FMODE_WRITE))
1241		goto error_out;
1242
1243	/*
1244	 * It is possible that the disk changing stuff resulted in
1245	 * the device being taken offline.  If this is the case,
1246	 * report this to the user, and don't pretend that the
1247	 * open actually succeeded.
1248	 */
1249	retval = -ENXIO;
1250	if (!scsi_device_online(sdev))
1251		goto error_out;
1252
1253	if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1254		if (scsi_block_when_processing_errors(sdev))
1255			scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1256	}
1257
1258	return 0;
1259
1260error_out:
1261	scsi_disk_put(sdkp);
1262	return retval;	
1263}
1264
1265/**
1266 *	sd_release - invoked when the (last) close(2) is called on this
1267 *	scsi disk.
1268 *	@inode: only i_rdev member may be used
1269 *	@filp: only f_mode and f_flags may be used
1270 *
1271 *	Returns 0. 
1272 *
1273 *	Note: may block (uninterruptible) if error recovery is underway
1274 *	on this disk.
1275 *
1276 *	Locking: called with bdev->bd_mutex held.
1277 **/
1278static void sd_release(struct gendisk *disk, fmode_t mode)
1279{
1280	struct scsi_disk *sdkp = scsi_disk(disk);
1281	struct scsi_device *sdev = sdkp->device;
1282
1283	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1284
1285	if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1286		if (scsi_block_when_processing_errors(sdev))
1287			scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1288	}
1289
1290	/*
1291	 * XXX and what if there are packets in flight and this close()
1292	 * XXX is followed by a "rmmod sd_mod"?
1293	 */
1294
1295	scsi_disk_put(sdkp);
1296}
1297
1298static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1299{
1300	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1301	struct scsi_device *sdp = sdkp->device;
1302	struct Scsi_Host *host = sdp->host;
1303	sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1304	int diskinfo[4];
1305
1306	/* default to most commonly used values */
1307	diskinfo[0] = 0x40;	/* 1 << 6 */
1308	diskinfo[1] = 0x20;	/* 1 << 5 */
1309	diskinfo[2] = capacity >> 11;
1310
1311	/* override with calculated, extended default, or driver values */
1312	if (host->hostt->bios_param)
1313		host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1314	else
1315		scsicam_bios_param(bdev, capacity, diskinfo);
1316
1317	geo->heads = diskinfo[0];
1318	geo->sectors = diskinfo[1];
1319	geo->cylinders = diskinfo[2];
1320	return 0;
1321}
1322
1323/**
1324 *	sd_ioctl - process an ioctl
1325 *	@inode: only i_rdev/i_bdev members may be used
1326 *	@filp: only f_mode and f_flags may be used
1327 *	@cmd: ioctl command number
1328 *	@arg: this is third argument given to ioctl(2) system call.
1329 *	Often contains a pointer.
1330 *
1331 *	Returns 0 if successful (some ioctls return positive numbers on
1332 *	success as well). Returns a negated errno value in case of error.
1333 *
1334 *	Note: most ioctls are forward onto the block subsystem or further
1335 *	down in the scsi subsystem.
1336 **/
1337static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1338		    unsigned int cmd, unsigned long arg)
1339{
1340	struct gendisk *disk = bdev->bd_disk;
1341	struct scsi_disk *sdkp = scsi_disk(disk);
1342	struct scsi_device *sdp = sdkp->device;
1343	void __user *p = (void __user *)arg;
1344	int error;
1345    
1346	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1347				    "cmd=0x%x\n", disk->disk_name, cmd));
1348
1349	error = scsi_verify_blk_ioctl(bdev, cmd);
1350	if (error < 0)
1351		return error;
1352
1353	/*
1354	 * If we are in the middle of error recovery, don't let anyone
1355	 * else try and use this device.  Also, if error recovery fails, it
1356	 * may try and take the device offline, in which case all further
1357	 * access to the device is prohibited.
1358	 */
1359	error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1360			(mode & FMODE_NDELAY) != 0);
1361	if (error)
1362		goto out;
1363
 
 
 
1364	/*
1365	 * Send SCSI addressing ioctls directly to mid level, send other
1366	 * ioctls to block level and then onto mid level if they can't be
1367	 * resolved.
1368	 */
1369	switch (cmd) {
1370		case SCSI_IOCTL_GET_IDLUN:
1371		case SCSI_IOCTL_GET_BUS_NUMBER:
1372			error = scsi_ioctl(sdp, cmd, p);
1373			break;
1374		default:
1375			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1376			if (error != -ENOTTY)
1377				break;
1378			error = scsi_ioctl(sdp, cmd, p);
1379			break;
1380	}
1381out:
1382	return error;
1383}
1384
1385static void set_media_not_present(struct scsi_disk *sdkp)
1386{
1387	if (sdkp->media_present)
1388		sdkp->device->changed = 1;
1389
1390	if (sdkp->device->removable) {
1391		sdkp->media_present = 0;
1392		sdkp->capacity = 0;
1393	}
1394}
1395
1396static int media_not_present(struct scsi_disk *sdkp,
1397			     struct scsi_sense_hdr *sshdr)
1398{
1399	if (!scsi_sense_valid(sshdr))
1400		return 0;
1401
1402	/* not invoked for commands that could return deferred errors */
1403	switch (sshdr->sense_key) {
1404	case UNIT_ATTENTION:
1405	case NOT_READY:
1406		/* medium not present */
1407		if (sshdr->asc == 0x3A) {
1408			set_media_not_present(sdkp);
1409			return 1;
1410		}
1411	}
1412	return 0;
1413}
1414
1415/**
1416 *	sd_check_events - check media events
1417 *	@disk: kernel device descriptor
1418 *	@clearing: disk events currently being cleared
1419 *
1420 *	Returns mask of DISK_EVENT_*.
1421 *
1422 *	Note: this function is invoked from the block subsystem.
1423 **/
1424static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1425{
1426	struct scsi_disk *sdkp = scsi_disk_get(disk);
1427	struct scsi_device *sdp;
1428	struct scsi_sense_hdr *sshdr = NULL;
1429	int retval;
1430
1431	if (!sdkp)
1432		return 0;
1433
1434	sdp = sdkp->device;
1435	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1436
1437	/*
1438	 * If the device is offline, don't send any commands - just pretend as
1439	 * if the command failed.  If the device ever comes back online, we
1440	 * can deal with it then.  It is only because of unrecoverable errors
1441	 * that we would ever take a device offline in the first place.
1442	 */
1443	if (!scsi_device_online(sdp)) {
1444		set_media_not_present(sdkp);
1445		goto out;
1446	}
1447
1448	/*
1449	 * Using TEST_UNIT_READY enables differentiation between drive with
1450	 * no cartridge loaded - NOT READY, drive with changed cartridge -
1451	 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1452	 *
1453	 * Drives that auto spin down. eg iomega jaz 1G, will be started
1454	 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1455	 * sd_revalidate() is called.
1456	 */
1457	retval = -ENODEV;
1458
1459	if (scsi_block_when_processing_errors(sdp)) {
1460		sshdr  = kzalloc(sizeof(*sshdr), GFP_KERNEL);
 
1461		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1462					      sshdr);
1463	}
1464
1465	/* failed to execute TUR, assume media not present */
1466	if (host_byte(retval)) {
1467		set_media_not_present(sdkp);
1468		goto out;
1469	}
1470
1471	if (media_not_present(sdkp, sshdr))
1472		goto out;
 
1473
1474	/*
1475	 * For removable scsi disk we have to recognise the presence
1476	 * of a disk in the drive.
1477	 */
1478	if (!sdkp->media_present)
1479		sdp->changed = 1;
1480	sdkp->media_present = 1;
1481out:
1482	/*
1483	 * sdp->changed is set under the following conditions:
1484	 *
1485	 *	Medium present state has changed in either direction.
1486	 *	Device has indicated UNIT_ATTENTION.
1487	 */
1488	kfree(sshdr);
1489	retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1490	sdp->changed = 0;
1491	scsi_disk_put(sdkp);
1492	return retval;
1493}
1494
1495static int sd_sync_cache(struct scsi_disk *sdkp)
1496{
1497	int retries, res;
1498	struct scsi_device *sdp = sdkp->device;
1499	const int timeout = sdp->request_queue->rq_timeout
1500		* SD_FLUSH_TIMEOUT_MULTIPLIER;
1501	struct scsi_sense_hdr sshdr;
1502
1503	if (!scsi_device_online(sdp))
1504		return -ENODEV;
1505
 
 
 
 
1506	for (retries = 3; retries > 0; --retries) {
1507		unsigned char cmd[10] = { 0 };
1508
1509		cmd[0] = SYNCHRONIZE_CACHE;
1510		/*
1511		 * Leave the rest of the command zero to indicate
1512		 * flush everything.
1513		 */
1514		res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1515					     &sshdr, timeout, SD_MAX_RETRIES,
1516					     NULL, 0, RQF_PM);
1517		if (res == 0)
1518			break;
1519	}
1520
1521	if (res) {
1522		sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1523
1524		if (driver_byte(res) & DRIVER_SENSE)
1525			sd_print_sense_hdr(sdkp, &sshdr);
 
1526		/* we need to evaluate the error return  */
1527		if (scsi_sense_valid(&sshdr) &&
1528			(sshdr.asc == 0x3a ||	/* medium not present */
1529			 sshdr.asc == 0x20))	/* invalid command */
 
1530				/* this is no error here */
1531				return 0;
1532
1533		switch (host_byte(res)) {
1534		/* ignore errors due to racing a disconnection */
1535		case DID_BAD_TARGET:
1536		case DID_NO_CONNECT:
1537			return 0;
1538		/* signal the upper layer it might try again */
1539		case DID_BUS_BUSY:
1540		case DID_IMM_RETRY:
1541		case DID_REQUEUE:
1542		case DID_SOFT_ERROR:
1543			return -EBUSY;
1544		default:
1545			return -EIO;
1546		}
1547	}
1548	return 0;
1549}
1550
1551static void sd_rescan(struct device *dev)
1552{
1553	struct scsi_disk *sdkp = dev_get_drvdata(dev);
1554
1555	revalidate_disk(sdkp->disk);
1556}
1557
1558
1559#ifdef CONFIG_COMPAT
1560/* 
1561 * This gets directly called from VFS. When the ioctl 
1562 * is not recognized we go back to the other translation paths. 
1563 */
1564static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1565			   unsigned int cmd, unsigned long arg)
1566{
1567	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1568	int error;
1569
1570	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1571			(mode & FMODE_NDELAY) != 0);
1572	if (error)
1573		return error;
1574	       
1575	/* 
1576	 * Let the static ioctl translation table take care of it.
1577	 */
1578	if (!sdev->host->hostt->compat_ioctl)
1579		return -ENOIOCTLCMD; 
1580	return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1581}
1582#endif
1583
1584static char sd_pr_type(enum pr_type type)
1585{
1586	switch (type) {
1587	case PR_WRITE_EXCLUSIVE:
1588		return 0x01;
1589	case PR_EXCLUSIVE_ACCESS:
1590		return 0x03;
1591	case PR_WRITE_EXCLUSIVE_REG_ONLY:
1592		return 0x05;
1593	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1594		return 0x06;
1595	case PR_WRITE_EXCLUSIVE_ALL_REGS:
1596		return 0x07;
1597	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1598		return 0x08;
1599	default:
1600		return 0;
1601	}
1602};
1603
1604static int sd_pr_command(struct block_device *bdev, u8 sa,
1605		u64 key, u64 sa_key, u8 type, u8 flags)
1606{
1607	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1608	struct scsi_sense_hdr sshdr;
1609	int result;
1610	u8 cmd[16] = { 0, };
1611	u8 data[24] = { 0, };
1612
1613	cmd[0] = PERSISTENT_RESERVE_OUT;
1614	cmd[1] = sa;
1615	cmd[2] = type;
1616	put_unaligned_be32(sizeof(data), &cmd[5]);
1617
1618	put_unaligned_be64(key, &data[0]);
1619	put_unaligned_be64(sa_key, &data[8]);
1620	data[20] = flags;
1621
1622	result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1623			&sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1624
1625	if ((driver_byte(result) & DRIVER_SENSE) &&
1626	    (scsi_sense_valid(&sshdr))) {
1627		sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1628		scsi_print_sense_hdr(sdev, NULL, &sshdr);
1629	}
1630
1631	return result;
1632}
1633
1634static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1635		u32 flags)
1636{
1637	if (flags & ~PR_FL_IGNORE_KEY)
1638		return -EOPNOTSUPP;
1639	return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1640			old_key, new_key, 0,
1641			(1 << 0) /* APTPL */);
1642}
1643
1644static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1645		u32 flags)
1646{
1647	if (flags)
1648		return -EOPNOTSUPP;
1649	return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1650}
1651
1652static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1653{
1654	return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1655}
1656
1657static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1658		enum pr_type type, bool abort)
1659{
1660	return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1661			     sd_pr_type(type), 0);
1662}
1663
1664static int sd_pr_clear(struct block_device *bdev, u64 key)
1665{
1666	return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1667}
1668
1669static const struct pr_ops sd_pr_ops = {
1670	.pr_register	= sd_pr_register,
1671	.pr_reserve	= sd_pr_reserve,
1672	.pr_release	= sd_pr_release,
1673	.pr_preempt	= sd_pr_preempt,
1674	.pr_clear	= sd_pr_clear,
1675};
1676
1677static const struct block_device_operations sd_fops = {
1678	.owner			= THIS_MODULE,
1679	.open			= sd_open,
1680	.release		= sd_release,
1681	.ioctl			= sd_ioctl,
1682	.getgeo			= sd_getgeo,
1683#ifdef CONFIG_COMPAT
1684	.compat_ioctl		= sd_compat_ioctl,
1685#endif
1686	.check_events		= sd_check_events,
1687	.revalidate_disk	= sd_revalidate_disk,
1688	.unlock_native_capacity	= sd_unlock_native_capacity,
 
1689	.pr_ops			= &sd_pr_ops,
1690};
1691
1692/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1693 *	sd_eh_action - error handling callback
1694 *	@scmd:		sd-issued command that has failed
1695 *	@eh_disp:	The recovery disposition suggested by the midlayer
1696 *
1697 *	This function is called by the SCSI midlayer upon completion of an
1698 *	error test command (currently TEST UNIT READY). The result of sending
1699 *	the eh command is passed in eh_disp.  We're looking for devices that
1700 *	fail medium access commands but are OK with non access commands like
1701 *	test unit ready (so wrongly see the device as having a successful
1702 *	recovery)
1703 **/
1704static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1705{
1706	struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
 
1707
1708	if (!scsi_device_online(scmd->device) ||
1709	    !scsi_medium_access_command(scmd) ||
1710	    host_byte(scmd->result) != DID_TIME_OUT ||
1711	    eh_disp != SUCCESS)
1712		return eh_disp;
1713
1714	/*
1715	 * The device has timed out executing a medium access command.
1716	 * However, the TEST UNIT READY command sent during error
1717	 * handling completed successfully. Either the device is in the
1718	 * process of recovering or has it suffered an internal failure
1719	 * that prevents access to the storage medium.
1720	 */
1721	sdkp->medium_access_timed_out++;
 
 
 
1722
1723	/*
1724	 * If the device keeps failing read/write commands but TEST UNIT
1725	 * READY always completes successfully we assume that medium
1726	 * access is no longer possible and take the device offline.
1727	 */
1728	if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1729		scmd_printk(KERN_ERR, scmd,
1730			    "Medium access timeout failure. Offlining disk!\n");
1731		scsi_device_set_state(scmd->device, SDEV_OFFLINE);
 
 
1732
1733		return FAILED;
1734	}
1735
1736	return eh_disp;
1737}
1738
1739static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1740{
1741	u64 start_lba = blk_rq_pos(scmd->request);
1742	u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1743	u64 factor = scmd->device->sector_size / 512;
1744	u64 bad_lba;
1745	int info_valid;
1746	/*
1747	 * resid is optional but mostly filled in.  When it's unused,
1748	 * its value is zero, so we assume the whole buffer transferred
1749	 */
1750	unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1751	unsigned int good_bytes;
1752
1753	if (scmd->request->cmd_type != REQ_TYPE_FS)
1754		return 0;
1755
1756	info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1757					     SCSI_SENSE_BUFFERSIZE,
1758					     &bad_lba);
1759	if (!info_valid)
1760		return 0;
1761
1762	if (scsi_bufflen(scmd) <= scmd->device->sector_size)
 
 
 
1763		return 0;
1764
1765	/* be careful ... don't want any overflows */
1766	do_div(start_lba, factor);
1767	do_div(end_lba, factor);
1768
1769	/* The bad lba was reported incorrectly, we have no idea where
1770	 * the error is.
1771	 */
1772	if (bad_lba < start_lba  || bad_lba >= end_lba)
 
 
1773		return 0;
1774
1775	/* This computation should always be done in terms of
1776	 * the resolution of the device's medium.
 
 
 
 
 
 
1777	 */
1778	good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
 
1779	return min(good_bytes, transferred);
1780}
1781
1782/**
1783 *	sd_done - bottom half handler: called when the lower level
1784 *	driver has completed (successfully or otherwise) a scsi command.
1785 *	@SCpnt: mid-level's per command structure.
1786 *
1787 *	Note: potentially run from within an ISR. Must not block.
1788 **/
1789static int sd_done(struct scsi_cmnd *SCpnt)
1790{
1791	int result = SCpnt->result;
1792	unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1793	unsigned int sector_size = SCpnt->device->sector_size;
1794	unsigned int resid;
1795	struct scsi_sense_hdr sshdr;
1796	struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1797	struct request *req = SCpnt->request;
1798	int sense_valid = 0;
1799	int sense_deferred = 0;
1800	unsigned char op = SCpnt->cmnd[0];
1801	unsigned char unmap = SCpnt->cmnd[1] & 8;
1802
1803	switch (req_op(req)) {
1804	case REQ_OP_DISCARD:
 
1805	case REQ_OP_WRITE_SAME:
1806	case REQ_OP_ZONE_RESET:
 
1807		if (!result) {
1808			good_bytes = blk_rq_bytes(req);
1809			scsi_set_resid(SCpnt, 0);
1810		} else {
1811			good_bytes = 0;
1812			scsi_set_resid(SCpnt, blk_rq_bytes(req));
1813		}
1814		break;
1815	case REQ_OP_ZONE_REPORT:
1816		if (!result) {
1817			good_bytes = scsi_bufflen(SCpnt)
1818				- scsi_get_resid(SCpnt);
1819			scsi_set_resid(SCpnt, 0);
1820		} else {
1821			good_bytes = 0;
1822			scsi_set_resid(SCpnt, blk_rq_bytes(req));
1823		}
1824		break;
1825	default:
1826		/*
1827		 * In case of bogus fw or device, we could end up having
1828		 * an unaligned partial completion. Check this here and force
1829		 * alignment.
1830		 */
1831		resid = scsi_get_resid(SCpnt);
1832		if (resid & (sector_size - 1)) {
1833			sd_printk(KERN_INFO, sdkp,
1834				"Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1835				resid, sector_size);
 
1836			resid = min(scsi_bufflen(SCpnt),
1837				    round_up(resid, sector_size));
1838			scsi_set_resid(SCpnt, resid);
1839		}
1840	}
1841
1842	if (result) {
1843		sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1844		if (sense_valid)
1845			sense_deferred = scsi_sense_is_deferred(&sshdr);
1846	}
1847	sdkp->medium_access_timed_out = 0;
1848
1849	if (driver_byte(result) != DRIVER_SENSE &&
1850	    (!sense_valid || sense_deferred))
1851		goto out;
1852
1853	switch (sshdr.sense_key) {
1854	case HARDWARE_ERROR:
1855	case MEDIUM_ERROR:
1856		good_bytes = sd_completed_bytes(SCpnt);
1857		break;
1858	case RECOVERED_ERROR:
1859		good_bytes = scsi_bufflen(SCpnt);
1860		break;
1861	case NO_SENSE:
1862		/* This indicates a false check condition, so ignore it.  An
1863		 * unknown amount of data was transferred so treat it as an
1864		 * error.
1865		 */
1866		SCpnt->result = 0;
1867		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1868		break;
1869	case ABORTED_COMMAND:
1870		if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
1871			good_bytes = sd_completed_bytes(SCpnt);
1872		break;
1873	case ILLEGAL_REQUEST:
1874		if (sshdr.asc == 0x10)  /* DIX: Host detected corruption */
 
1875			good_bytes = sd_completed_bytes(SCpnt);
1876		/* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1877		if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1878			switch (op) {
 
1879			case UNMAP:
1880				sd_config_discard(sdkp, SD_LBP_DISABLE);
1881				break;
1882			case WRITE_SAME_16:
1883			case WRITE_SAME:
1884				if (unmap)
1885					sd_config_discard(sdkp, SD_LBP_DISABLE);
1886				else {
1887					sdkp->device->no_write_same = 1;
1888					sd_config_write_same(sdkp);
1889
1890					good_bytes = 0;
1891					req->__data_len = blk_rq_bytes(req);
1892					req->rq_flags |= RQF_QUIET;
1893				}
 
1894			}
1895		}
1896		break;
1897	default:
1898		break;
1899	}
1900
1901 out:
1902	if (sd_is_zoned(sdkp))
1903		sd_zbc_complete(SCpnt, good_bytes, &sshdr);
1904
1905	SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1906					   "sd_done: completed %d of %d bytes\n",
1907					   good_bytes, scsi_bufflen(SCpnt)));
1908
1909	if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1910		sd_dif_complete(SCpnt, good_bytes);
1911
1912	return good_bytes;
1913}
1914
1915/*
1916 * spinup disk - called only in sd_revalidate_disk()
1917 */
1918static void
1919sd_spinup_disk(struct scsi_disk *sdkp)
1920{
1921	unsigned char cmd[10];
1922	unsigned long spintime_expire = 0;
1923	int retries, spintime;
1924	unsigned int the_result;
1925	struct scsi_sense_hdr sshdr;
1926	int sense_valid = 0;
1927
1928	spintime = 0;
1929
1930	/* Spin up drives, as required.  Only do this at boot time */
1931	/* Spinup needs to be done for module loads too. */
1932	do {
1933		retries = 0;
1934
1935		do {
1936			cmd[0] = TEST_UNIT_READY;
1937			memset((void *) &cmd[1], 0, 9);
1938
1939			the_result = scsi_execute_req(sdkp->device, cmd,
1940						      DMA_NONE, NULL, 0,
1941						      &sshdr, SD_TIMEOUT,
1942						      SD_MAX_RETRIES, NULL);
1943
1944			/*
1945			 * If the drive has indicated to us that it
1946			 * doesn't have any media in it, don't bother
1947			 * with any more polling.
1948			 */
1949			if (media_not_present(sdkp, &sshdr))
1950				return;
1951
1952			if (the_result)
1953				sense_valid = scsi_sense_valid(&sshdr);
1954			retries++;
1955		} while (retries < 3 && 
1956			 (!scsi_status_is_good(the_result) ||
1957			  ((driver_byte(the_result) & DRIVER_SENSE) &&
1958			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1959
1960		if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1961			/* no sense, TUR either succeeded or failed
1962			 * with a status error */
1963			if(!spintime && !scsi_status_is_good(the_result)) {
1964				sd_print_result(sdkp, "Test Unit Ready failed",
1965						the_result);
1966			}
1967			break;
1968		}
1969
1970		/*
1971		 * The device does not want the automatic start to be issued.
1972		 */
1973		if (sdkp->device->no_start_on_add)
1974			break;
1975
1976		if (sense_valid && sshdr.sense_key == NOT_READY) {
1977			if (sshdr.asc == 4 && sshdr.ascq == 3)
1978				break;	/* manual intervention required */
1979			if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1980				break;	/* standby */
1981			if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1982				break;	/* unavailable */
 
 
1983			/*
1984			 * Issue command to spin up drive when not ready
1985			 */
1986			if (!spintime) {
1987				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1988				cmd[0] = START_STOP;
1989				cmd[1] = 1;	/* Return immediately */
1990				memset((void *) &cmd[2], 0, 8);
1991				cmd[4] = 1;	/* Start spin cycle */
1992				if (sdkp->device->start_stop_pwr_cond)
1993					cmd[4] |= 1 << 4;
1994				scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1995						 NULL, 0, &sshdr,
1996						 SD_TIMEOUT, SD_MAX_RETRIES,
1997						 NULL);
1998				spintime_expire = jiffies + 100 * HZ;
1999				spintime = 1;
2000			}
2001			/* Wait 1 second for next try */
2002			msleep(1000);
2003			printk(".");
2004
2005		/*
2006		 * Wait for USB flash devices with slow firmware.
2007		 * Yes, this sense key/ASC combination shouldn't
2008		 * occur here.  It's characteristic of these devices.
2009		 */
2010		} else if (sense_valid &&
2011				sshdr.sense_key == UNIT_ATTENTION &&
2012				sshdr.asc == 0x28) {
2013			if (!spintime) {
2014				spintime_expire = jiffies + 5 * HZ;
2015				spintime = 1;
2016			}
2017			/* Wait 1 second for next try */
2018			msleep(1000);
2019		} else {
2020			/* we don't understand the sense code, so it's
2021			 * probably pointless to loop */
2022			if(!spintime) {
2023				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2024				sd_print_sense_hdr(sdkp, &sshdr);
2025			}
2026			break;
2027		}
2028				
2029	} while (spintime && time_before_eq(jiffies, spintime_expire));
2030
2031	if (spintime) {
2032		if (scsi_status_is_good(the_result))
2033			printk("ready\n");
2034		else
2035			printk("not responding...\n");
2036	}
2037}
2038
2039/*
2040 * Determine whether disk supports Data Integrity Field.
2041 */
2042static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2043{
2044	struct scsi_device *sdp = sdkp->device;
2045	u8 type;
2046	int ret = 0;
2047
2048	if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2049		return ret;
2050
2051	type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2052
2053	if (type > T10_PI_TYPE3_PROTECTION)
2054		ret = -ENODEV;
2055	else if (scsi_host_dif_capable(sdp->host, type))
2056		ret = 1;
2057
2058	if (sdkp->first_scan || type != sdkp->protection_type)
2059		switch (ret) {
2060		case -ENODEV:
2061			sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2062				  " protection type %u. Disabling disk!\n",
2063				  type);
2064			break;
2065		case 1:
2066			sd_printk(KERN_NOTICE, sdkp,
2067				  "Enabling DIF Type %u protection\n", type);
2068			break;
2069		case 0:
2070			sd_printk(KERN_NOTICE, sdkp,
2071				  "Disabling DIF Type %u protection\n", type);
2072			break;
2073		}
2074
2075	sdkp->protection_type = type;
2076
2077	return ret;
2078}
2079
2080static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2081			struct scsi_sense_hdr *sshdr, int sense_valid,
2082			int the_result)
2083{
2084	if (driver_byte(the_result) & DRIVER_SENSE)
2085		sd_print_sense_hdr(sdkp, sshdr);
2086	else
2087		sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2088
2089	/*
2090	 * Set dirty bit for removable devices if not ready -
2091	 * sometimes drives will not report this properly.
2092	 */
2093	if (sdp->removable &&
2094	    sense_valid && sshdr->sense_key == NOT_READY)
2095		set_media_not_present(sdkp);
2096
2097	/*
2098	 * We used to set media_present to 0 here to indicate no media
2099	 * in the drive, but some drives fail read capacity even with
2100	 * media present, so we can't do that.
2101	 */
2102	sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2103}
2104
2105#define RC16_LEN 32
2106#if RC16_LEN > SD_BUF_SIZE
2107#error RC16_LEN must not be more than SD_BUF_SIZE
2108#endif
2109
2110#define READ_CAPACITY_RETRIES_ON_RESET	10
2111
2112static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2113						unsigned char *buffer)
2114{
2115	unsigned char cmd[16];
2116	struct scsi_sense_hdr sshdr;
2117	int sense_valid = 0;
2118	int the_result;
2119	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2120	unsigned int alignment;
2121	unsigned long long lba;
2122	unsigned sector_size;
2123
2124	if (sdp->no_read_capacity_16)
2125		return -EINVAL;
2126
2127	do {
2128		memset(cmd, 0, 16);
2129		cmd[0] = SERVICE_ACTION_IN_16;
2130		cmd[1] = SAI_READ_CAPACITY_16;
2131		cmd[13] = RC16_LEN;
2132		memset(buffer, 0, RC16_LEN);
2133
2134		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2135					buffer, RC16_LEN, &sshdr,
2136					SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2137
2138		if (media_not_present(sdkp, &sshdr))
2139			return -ENODEV;
2140
2141		if (the_result) {
2142			sense_valid = scsi_sense_valid(&sshdr);
2143			if (sense_valid &&
2144			    sshdr.sense_key == ILLEGAL_REQUEST &&
2145			    (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2146			    sshdr.ascq == 0x00)
2147				/* Invalid Command Operation Code or
2148				 * Invalid Field in CDB, just retry
2149				 * silently with RC10 */
2150				return -EINVAL;
2151			if (sense_valid &&
2152			    sshdr.sense_key == UNIT_ATTENTION &&
2153			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2154				/* Device reset might occur several times,
2155				 * give it one more chance */
2156				if (--reset_retries > 0)
2157					continue;
2158		}
2159		retries--;
2160
2161	} while (the_result && retries);
2162
2163	if (the_result) {
2164		sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2165		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2166		return -EINVAL;
2167	}
2168
2169	sector_size = get_unaligned_be32(&buffer[8]);
2170	lba = get_unaligned_be64(&buffer[0]);
2171
2172	if (sd_read_protection_type(sdkp, buffer) < 0) {
2173		sdkp->capacity = 0;
2174		return -ENODEV;
2175	}
2176
2177	if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2178		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2179			"kernel compiled with support for large block "
2180			"devices.\n");
2181		sdkp->capacity = 0;
2182		return -EOVERFLOW;
2183	}
2184
2185	/* Logical blocks per physical block exponent */
2186	sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2187
2188	/* RC basis */
2189	sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2190
2191	/* Lowest aligned logical block */
2192	alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2193	blk_queue_alignment_offset(sdp->request_queue, alignment);
2194	if (alignment && sdkp->first_scan)
2195		sd_printk(KERN_NOTICE, sdkp,
2196			  "physical block alignment offset: %u\n", alignment);
2197
2198	if (buffer[14] & 0x80) { /* LBPME */
2199		sdkp->lbpme = 1;
2200
2201		if (buffer[14] & 0x40) /* LBPRZ */
2202			sdkp->lbprz = 1;
2203
2204		sd_config_discard(sdkp, SD_LBP_WS16);
2205	}
2206
2207	sdkp->capacity = lba + 1;
2208	return sector_size;
2209}
2210
2211static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2212						unsigned char *buffer)
2213{
2214	unsigned char cmd[16];
2215	struct scsi_sense_hdr sshdr;
2216	int sense_valid = 0;
2217	int the_result;
2218	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2219	sector_t lba;
2220	unsigned sector_size;
2221
2222	do {
2223		cmd[0] = READ_CAPACITY;
2224		memset(&cmd[1], 0, 9);
2225		memset(buffer, 0, 8);
2226
2227		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2228					buffer, 8, &sshdr,
2229					SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2230
2231		if (media_not_present(sdkp, &sshdr))
2232			return -ENODEV;
2233
2234		if (the_result) {
2235			sense_valid = scsi_sense_valid(&sshdr);
2236			if (sense_valid &&
2237			    sshdr.sense_key == UNIT_ATTENTION &&
2238			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2239				/* Device reset might occur several times,
2240				 * give it one more chance */
2241				if (--reset_retries > 0)
2242					continue;
2243		}
2244		retries--;
2245
2246	} while (the_result && retries);
2247
2248	if (the_result) {
2249		sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2250		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2251		return -EINVAL;
2252	}
2253
2254	sector_size = get_unaligned_be32(&buffer[4]);
2255	lba = get_unaligned_be32(&buffer[0]);
2256
2257	if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2258		/* Some buggy (usb cardreader) devices return an lba of
2259		   0xffffffff when the want to report a size of 0 (with
2260		   which they really mean no media is present) */
2261		sdkp->capacity = 0;
2262		sdkp->physical_block_size = sector_size;
2263		return sector_size;
2264	}
2265
2266	if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2267		sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2268			"kernel compiled with support for large block "
2269			"devices.\n");
2270		sdkp->capacity = 0;
2271		return -EOVERFLOW;
2272	}
2273
2274	sdkp->capacity = lba + 1;
2275	sdkp->physical_block_size = sector_size;
2276	return sector_size;
2277}
2278
2279static int sd_try_rc16_first(struct scsi_device *sdp)
2280{
2281	if (sdp->host->max_cmd_len < 16)
2282		return 0;
2283	if (sdp->try_rc_10_first)
2284		return 0;
2285	if (sdp->scsi_level > SCSI_SPC_2)
2286		return 1;
2287	if (scsi_device_protection(sdp))
2288		return 1;
2289	return 0;
2290}
2291
2292/*
2293 * read disk capacity
2294 */
2295static void
2296sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2297{
2298	int sector_size;
2299	struct scsi_device *sdp = sdkp->device;
2300
2301	if (sd_try_rc16_first(sdp)) {
2302		sector_size = read_capacity_16(sdkp, sdp, buffer);
2303		if (sector_size == -EOVERFLOW)
2304			goto got_data;
2305		if (sector_size == -ENODEV)
2306			return;
2307		if (sector_size < 0)
2308			sector_size = read_capacity_10(sdkp, sdp, buffer);
2309		if (sector_size < 0)
2310			return;
2311	} else {
2312		sector_size = read_capacity_10(sdkp, sdp, buffer);
2313		if (sector_size == -EOVERFLOW)
2314			goto got_data;
2315		if (sector_size < 0)
2316			return;
2317		if ((sizeof(sdkp->capacity) > 4) &&
2318		    (sdkp->capacity > 0xffffffffULL)) {
2319			int old_sector_size = sector_size;
2320			sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2321					"Trying to use READ CAPACITY(16).\n");
2322			sector_size = read_capacity_16(sdkp, sdp, buffer);
2323			if (sector_size < 0) {
2324				sd_printk(KERN_NOTICE, sdkp,
2325					"Using 0xffffffff as device size\n");
2326				sdkp->capacity = 1 + (sector_t) 0xffffffff;
2327				sector_size = old_sector_size;
2328				goto got_data;
2329			}
 
 
2330		}
2331	}
2332
2333	/* Some devices are known to return the total number of blocks,
2334	 * not the highest block number.  Some devices have versions
2335	 * which do this and others which do not.  Some devices we might
2336	 * suspect of doing this but we don't know for certain.
2337	 *
2338	 * If we know the reported capacity is wrong, decrement it.  If
2339	 * we can only guess, then assume the number of blocks is even
2340	 * (usually true but not always) and err on the side of lowering
2341	 * the capacity.
2342	 */
2343	if (sdp->fix_capacity ||
2344	    (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2345		sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2346				"from its reported value: %llu\n",
2347				(unsigned long long) sdkp->capacity);
2348		--sdkp->capacity;
2349	}
2350
2351got_data:
2352	if (sector_size == 0) {
2353		sector_size = 512;
2354		sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2355			  "assuming 512.\n");
2356	}
2357
2358	if (sector_size != 512 &&
2359	    sector_size != 1024 &&
2360	    sector_size != 2048 &&
2361	    sector_size != 4096) {
2362		sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2363			  sector_size);
2364		/*
2365		 * The user might want to re-format the drive with
2366		 * a supported sectorsize.  Once this happens, it
2367		 * would be relatively trivial to set the thing up.
2368		 * For this reason, we leave the thing in the table.
2369		 */
2370		sdkp->capacity = 0;
2371		/*
2372		 * set a bogus sector size so the normal read/write
2373		 * logic in the block layer will eventually refuse any
2374		 * request on this device without tripping over power
2375		 * of two sector size assumptions
2376		 */
2377		sector_size = 512;
2378	}
2379	blk_queue_logical_block_size(sdp->request_queue, sector_size);
2380	blk_queue_physical_block_size(sdp->request_queue,
2381				      sdkp->physical_block_size);
2382	sdkp->device->sector_size = sector_size;
2383
2384	if (sdkp->capacity > 0xffffffff)
2385		sdp->use_16_for_rw = 1;
2386
2387}
2388
2389/*
2390 * Print disk capacity
2391 */
2392static void
2393sd_print_capacity(struct scsi_disk *sdkp,
2394		  sector_t old_capacity)
2395{
2396	int sector_size = sdkp->device->sector_size;
2397	char cap_str_2[10], cap_str_10[10];
2398
 
 
 
2399	string_get_size(sdkp->capacity, sector_size,
2400			STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2401	string_get_size(sdkp->capacity, sector_size,
2402			STRING_UNITS_10, cap_str_10,
2403			sizeof(cap_str_10));
2404
2405	if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2406		sd_printk(KERN_NOTICE, sdkp,
2407			  "%llu %d-byte logical blocks: (%s/%s)\n",
2408			  (unsigned long long)sdkp->capacity,
2409			  sector_size, cap_str_10, cap_str_2);
2410
2411		if (sdkp->physical_block_size != sector_size)
2412			sd_printk(KERN_NOTICE, sdkp,
2413				  "%u-byte physical blocks\n",
2414				  sdkp->physical_block_size);
2415
2416		sd_zbc_print_zones(sdkp);
2417	}
2418}
2419
2420/* called with buffer of length 512 */
2421static inline int
2422sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2423		 unsigned char *buffer, int len, struct scsi_mode_data *data,
2424		 struct scsi_sense_hdr *sshdr)
2425{
2426	return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2427			       SD_TIMEOUT, SD_MAX_RETRIES, data,
2428			       sshdr);
2429}
2430
2431/*
2432 * read write protect setting, if possible - called only in sd_revalidate_disk()
2433 * called with buffer of length SD_BUF_SIZE
2434 */
2435static void
2436sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2437{
2438	int res;
2439	struct scsi_device *sdp = sdkp->device;
2440	struct scsi_mode_data data;
2441	int old_wp = sdkp->write_prot;
2442
2443	set_disk_ro(sdkp->disk, 0);
2444	if (sdp->skip_ms_page_3f) {
2445		sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2446		return;
2447	}
2448
2449	if (sdp->use_192_bytes_for_3f) {
2450		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2451	} else {
2452		/*
2453		 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2454		 * We have to start carefully: some devices hang if we ask
2455		 * for more than is available.
2456		 */
2457		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2458
2459		/*
2460		 * Second attempt: ask for page 0 When only page 0 is
2461		 * implemented, a request for page 3F may return Sense Key
2462		 * 5: Illegal Request, Sense Code 24: Invalid field in
2463		 * CDB.
2464		 */
2465		if (!scsi_status_is_good(res))
2466			res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2467
2468		/*
2469		 * Third attempt: ask 255 bytes, as we did earlier.
2470		 */
2471		if (!scsi_status_is_good(res))
2472			res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2473					       &data, NULL);
2474	}
2475
2476	if (!scsi_status_is_good(res)) {
2477		sd_first_printk(KERN_WARNING, sdkp,
2478			  "Test WP failed, assume Write Enabled\n");
2479	} else {
2480		sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2481		set_disk_ro(sdkp->disk, sdkp->write_prot);
2482		if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2483			sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2484				  sdkp->write_prot ? "on" : "off");
2485			sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2486		}
2487	}
2488}
2489
2490/*
2491 * sd_read_cache_type - called only from sd_revalidate_disk()
2492 * called with buffer of length SD_BUF_SIZE
2493 */
2494static void
2495sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2496{
2497	int len = 0, res;
2498	struct scsi_device *sdp = sdkp->device;
2499
2500	int dbd;
2501	int modepage;
2502	int first_len;
2503	struct scsi_mode_data data;
2504	struct scsi_sense_hdr sshdr;
2505	int old_wce = sdkp->WCE;
2506	int old_rcd = sdkp->RCD;
2507	int old_dpofua = sdkp->DPOFUA;
2508
2509
2510	if (sdkp->cache_override)
2511		return;
2512
2513	first_len = 4;
2514	if (sdp->skip_ms_page_8) {
2515		if (sdp->type == TYPE_RBC)
2516			goto defaults;
2517		else {
2518			if (sdp->skip_ms_page_3f)
2519				goto defaults;
2520			modepage = 0x3F;
2521			if (sdp->use_192_bytes_for_3f)
2522				first_len = 192;
2523			dbd = 0;
2524		}
2525	} else if (sdp->type == TYPE_RBC) {
2526		modepage = 6;
2527		dbd = 8;
2528	} else {
2529		modepage = 8;
2530		dbd = 0;
2531	}
2532
2533	/* cautiously ask */
2534	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2535			&data, &sshdr);
2536
2537	if (!scsi_status_is_good(res))
2538		goto bad_sense;
2539
2540	if (!data.header_length) {
2541		modepage = 6;
2542		first_len = 0;
2543		sd_first_printk(KERN_ERR, sdkp,
2544				"Missing header in MODE_SENSE response\n");
2545	}
2546
2547	/* that went OK, now ask for the proper length */
2548	len = data.length;
2549
2550	/*
2551	 * We're only interested in the first three bytes, actually.
2552	 * But the data cache page is defined for the first 20.
2553	 */
2554	if (len < 3)
2555		goto bad_sense;
2556	else if (len > SD_BUF_SIZE) {
2557		sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2558			  "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2559		len = SD_BUF_SIZE;
2560	}
2561	if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2562		len = 192;
2563
2564	/* Get the data */
2565	if (len > first_len)
2566		res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2567				&data, &sshdr);
2568
2569	if (scsi_status_is_good(res)) {
2570		int offset = data.header_length + data.block_descriptor_length;
2571
2572		while (offset < len) {
2573			u8 page_code = buffer[offset] & 0x3F;
2574			u8 spf       = buffer[offset] & 0x40;
2575
2576			if (page_code == 8 || page_code == 6) {
2577				/* We're interested only in the first 3 bytes.
2578				 */
2579				if (len - offset <= 2) {
2580					sd_first_printk(KERN_ERR, sdkp,
2581						"Incomplete mode parameter "
2582							"data\n");
2583					goto defaults;
2584				} else {
2585					modepage = page_code;
2586					goto Page_found;
2587				}
2588			} else {
2589				/* Go to the next page */
2590				if (spf && len - offset > 3)
2591					offset += 4 + (buffer[offset+2] << 8) +
2592						buffer[offset+3];
2593				else if (!spf && len - offset > 1)
2594					offset += 2 + buffer[offset+1];
2595				else {
2596					sd_first_printk(KERN_ERR, sdkp,
2597							"Incomplete mode "
2598							"parameter data\n");
2599					goto defaults;
2600				}
2601			}
2602		}
2603
2604		sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2605		goto defaults;
2606
2607	Page_found:
2608		if (modepage == 8) {
2609			sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2610			sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2611		} else {
2612			sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2613			sdkp->RCD = 0;
2614		}
2615
2616		sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2617		if (sdp->broken_fua) {
2618			sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2619			sdkp->DPOFUA = 0;
2620		} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2621			   !sdkp->device->use_16_for_rw) {
2622			sd_first_printk(KERN_NOTICE, sdkp,
2623				  "Uses READ/WRITE(6), disabling FUA\n");
2624			sdkp->DPOFUA = 0;
2625		}
2626
2627		/* No cache flush allowed for write protected devices */
2628		if (sdkp->WCE && sdkp->write_prot)
2629			sdkp->WCE = 0;
2630
2631		if (sdkp->first_scan || old_wce != sdkp->WCE ||
2632		    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2633			sd_printk(KERN_NOTICE, sdkp,
2634				  "Write cache: %s, read cache: %s, %s\n",
2635				  sdkp->WCE ? "enabled" : "disabled",
2636				  sdkp->RCD ? "disabled" : "enabled",
2637				  sdkp->DPOFUA ? "supports DPO and FUA"
2638				  : "doesn't support DPO or FUA");
2639
2640		return;
2641	}
2642
2643bad_sense:
2644	if (scsi_sense_valid(&sshdr) &&
2645	    sshdr.sense_key == ILLEGAL_REQUEST &&
2646	    sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2647		/* Invalid field in CDB */
2648		sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2649	else
2650		sd_first_printk(KERN_ERR, sdkp,
2651				"Asking for cache data failed\n");
2652
2653defaults:
2654	if (sdp->wce_default_on) {
2655		sd_first_printk(KERN_NOTICE, sdkp,
2656				"Assuming drive cache: write back\n");
2657		sdkp->WCE = 1;
2658	} else {
2659		sd_first_printk(KERN_ERR, sdkp,
2660				"Assuming drive cache: write through\n");
2661		sdkp->WCE = 0;
2662	}
2663	sdkp->RCD = 0;
2664	sdkp->DPOFUA = 0;
2665}
2666
2667/*
2668 * The ATO bit indicates whether the DIF application tag is available
2669 * for use by the operating system.
2670 */
2671static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2672{
2673	int res, offset;
2674	struct scsi_device *sdp = sdkp->device;
2675	struct scsi_mode_data data;
2676	struct scsi_sense_hdr sshdr;
2677
2678	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2679		return;
2680
2681	if (sdkp->protection_type == 0)
2682		return;
2683
2684	res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2685			      SD_MAX_RETRIES, &data, &sshdr);
2686
2687	if (!scsi_status_is_good(res) || !data.header_length ||
2688	    data.length < 6) {
2689		sd_first_printk(KERN_WARNING, sdkp,
2690			  "getting Control mode page failed, assume no ATO\n");
2691
2692		if (scsi_sense_valid(&sshdr))
2693			sd_print_sense_hdr(sdkp, &sshdr);
2694
2695		return;
2696	}
2697
2698	offset = data.header_length + data.block_descriptor_length;
2699
2700	if ((buffer[offset] & 0x3f) != 0x0a) {
2701		sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2702		return;
2703	}
2704
2705	if ((buffer[offset + 5] & 0x80) == 0)
2706		return;
2707
2708	sdkp->ATO = 1;
2709
2710	return;
2711}
2712
2713/**
2714 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2715 * @disk: disk to query
2716 */
2717static void sd_read_block_limits(struct scsi_disk *sdkp)
2718{
2719	unsigned int sector_sz = sdkp->device->sector_size;
2720	const int vpd_len = 64;
2721	unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2722
2723	if (!buffer ||
2724	    /* Block Limits VPD */
2725	    scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2726		goto out;
2727
2728	blk_queue_io_min(sdkp->disk->queue,
2729			 get_unaligned_be16(&buffer[6]) * sector_sz);
2730
2731	sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2732	sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2733
2734	if (buffer[3] == 0x3c) {
2735		unsigned int lba_count, desc_count;
2736
2737		sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2738
2739		if (!sdkp->lbpme)
2740			goto out;
2741
2742		lba_count = get_unaligned_be32(&buffer[20]);
2743		desc_count = get_unaligned_be32(&buffer[24]);
2744
2745		if (lba_count && desc_count)
2746			sdkp->max_unmap_blocks = lba_count;
2747
2748		sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2749
2750		if (buffer[32] & 0x80)
2751			sdkp->unmap_alignment =
2752				get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2753
2754		if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2755
2756			if (sdkp->max_unmap_blocks)
2757				sd_config_discard(sdkp, SD_LBP_UNMAP);
2758			else
2759				sd_config_discard(sdkp, SD_LBP_WS16);
2760
2761		} else {	/* LBP VPD page tells us what to use */
2762			if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2763				sd_config_discard(sdkp, SD_LBP_UNMAP);
2764			else if (sdkp->lbpws)
2765				sd_config_discard(sdkp, SD_LBP_WS16);
2766			else if (sdkp->lbpws10)
2767				sd_config_discard(sdkp, SD_LBP_WS10);
2768			else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2769				sd_config_discard(sdkp, SD_LBP_UNMAP);
2770			else
2771				sd_config_discard(sdkp, SD_LBP_DISABLE);
2772		}
2773	}
2774
2775 out:
2776	kfree(buffer);
2777}
2778
2779/**
2780 * sd_read_block_characteristics - Query block dev. characteristics
2781 * @disk: disk to query
2782 */
2783static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2784{
2785	struct request_queue *q = sdkp->disk->queue;
2786	unsigned char *buffer;
2787	u16 rot;
2788	const int vpd_len = 64;
2789
2790	buffer = kmalloc(vpd_len, GFP_KERNEL);
2791
2792	if (!buffer ||
2793	    /* Block Device Characteristics VPD */
2794	    scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2795		goto out;
2796
2797	rot = get_unaligned_be16(&buffer[4]);
2798
2799	if (rot == 1) {
2800		queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2801		queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2802	}
2803
2804	if (sdkp->device->type == TYPE_ZBC) {
2805		/* Host-managed */
2806		q->limits.zoned = BLK_ZONED_HM;
2807	} else {
2808		sdkp->zoned = (buffer[8] >> 4) & 3;
2809		if (sdkp->zoned == 1)
2810			/* Host-aware */
2811			q->limits.zoned = BLK_ZONED_HA;
2812		else
2813			/*
2814			 * Treat drive-managed devices as
2815			 * regular block devices.
2816			 */
2817			q->limits.zoned = BLK_ZONED_NONE;
2818	}
2819	if (blk_queue_is_zoned(q) && sdkp->first_scan)
2820		sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2821		      q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2822
2823 out:
2824	kfree(buffer);
2825}
2826
2827/**
2828 * sd_read_block_provisioning - Query provisioning VPD page
2829 * @disk: disk to query
2830 */
2831static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2832{
2833	unsigned char *buffer;
2834	const int vpd_len = 8;
2835
2836	if (sdkp->lbpme == 0)
2837		return;
2838
2839	buffer = kmalloc(vpd_len, GFP_KERNEL);
2840
2841	if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2842		goto out;
2843
2844	sdkp->lbpvpd	= 1;
2845	sdkp->lbpu	= (buffer[5] >> 7) & 1;	/* UNMAP */
2846	sdkp->lbpws	= (buffer[5] >> 6) & 1;	/* WRITE SAME(16) with UNMAP */
2847	sdkp->lbpws10	= (buffer[5] >> 5) & 1;	/* WRITE SAME(10) with UNMAP */
2848
2849 out:
2850	kfree(buffer);
2851}
2852
2853static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2854{
2855	struct scsi_device *sdev = sdkp->device;
2856
2857	if (sdev->host->no_write_same) {
2858		sdev->no_write_same = 1;
2859
2860		return;
2861	}
2862
2863	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2864		/* too large values might cause issues with arcmsr */
2865		int vpd_buf_len = 64;
2866
2867		sdev->no_report_opcodes = 1;
2868
2869		/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2870		 * CODES is unsupported and the device has an ATA
2871		 * Information VPD page (SAT).
2872		 */
2873		if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2874			sdev->no_write_same = 1;
2875	}
2876
2877	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2878		sdkp->ws16 = 1;
2879
2880	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2881		sdkp->ws10 = 1;
2882}
2883
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2884/**
2885 *	sd_revalidate_disk - called the first time a new disk is seen,
2886 *	performs disk spin up, read_capacity, etc.
2887 *	@disk: struct gendisk we care about
2888 **/
2889static int sd_revalidate_disk(struct gendisk *disk)
2890{
2891	struct scsi_disk *sdkp = scsi_disk(disk);
2892	struct scsi_device *sdp = sdkp->device;
2893	struct request_queue *q = sdkp->disk->queue;
2894	sector_t old_capacity = sdkp->capacity;
2895	unsigned char *buffer;
2896	unsigned int dev_max, rw_max;
2897
2898	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2899				      "sd_revalidate_disk\n"));
2900
2901	/*
2902	 * If the device is offline, don't try and read capacity or any
2903	 * of the other niceties.
2904	 */
2905	if (!scsi_device_online(sdp))
2906		goto out;
2907
2908	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2909	if (!buffer) {
2910		sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2911			  "allocation failure.\n");
2912		goto out;
2913	}
2914
2915	sd_spinup_disk(sdkp);
2916
2917	/*
2918	 * Without media there is no reason to ask; moreover, some devices
2919	 * react badly if we do.
2920	 */
2921	if (sdkp->media_present) {
2922		sd_read_capacity(sdkp, buffer);
2923
 
 
 
 
 
 
 
 
 
2924		if (scsi_device_supports_vpd(sdp)) {
2925			sd_read_block_provisioning(sdkp);
2926			sd_read_block_limits(sdkp);
2927			sd_read_block_characteristics(sdkp);
2928			sd_zbc_read_zones(sdkp, buffer);
2929		}
2930
2931		sd_print_capacity(sdkp, old_capacity);
2932
2933		sd_read_write_protect_flag(sdkp, buffer);
2934		sd_read_cache_type(sdkp, buffer);
2935		sd_read_app_tag_own(sdkp, buffer);
2936		sd_read_write_same(sdkp, buffer);
 
2937	}
2938
2939	sdkp->first_scan = 0;
2940
2941	/*
2942	 * We now have all cache related info, determine how we deal
2943	 * with flush requests.
2944	 */
2945	sd_set_flush_flag(sdkp);
2946
2947	/* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2948	dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2949
2950	/* Some devices report a maximum block count for READ/WRITE requests. */
2951	dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2952	q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2953
2954	/*
2955	 * Use the device's preferred I/O size for reads and writes
2956	 * unless the reported value is unreasonably small, large, or
2957	 * garbage.
2958	 */
2959	if (sdkp->opt_xfer_blocks &&
2960	    sdkp->opt_xfer_blocks <= dev_max &&
2961	    sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2962	    logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2963		q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2964		rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2965	} else
2966		rw_max = BLK_DEF_MAX_SECTORS;
 
 
 
 
 
 
 
 
 
 
 
 
 
2967
2968	/* Combine with controller limits */
2969	q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2970
2971	set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2972	sd_config_write_same(sdkp);
2973	kfree(buffer);
2974
2975 out:
2976	return 0;
2977}
2978
2979/**
2980 *	sd_unlock_native_capacity - unlock native capacity
2981 *	@disk: struct gendisk to set capacity for
2982 *
2983 *	Block layer calls this function if it detects that partitions
2984 *	on @disk reach beyond the end of the device.  If the SCSI host
2985 *	implements ->unlock_native_capacity() method, it's invoked to
2986 *	give it a chance to adjust the device capacity.
2987 *
2988 *	CONTEXT:
2989 *	Defined by block layer.  Might sleep.
2990 */
2991static void sd_unlock_native_capacity(struct gendisk *disk)
2992{
2993	struct scsi_device *sdev = scsi_disk(disk)->device;
2994
2995	if (sdev->host->hostt->unlock_native_capacity)
2996		sdev->host->hostt->unlock_native_capacity(sdev);
2997}
2998
2999/**
3000 *	sd_format_disk_name - format disk name
3001 *	@prefix: name prefix - ie. "sd" for SCSI disks
3002 *	@index: index of the disk to format name for
3003 *	@buf: output buffer
3004 *	@buflen: length of the output buffer
3005 *
3006 *	SCSI disk names starts at sda.  The 26th device is sdz and the
3007 *	27th is sdaa.  The last one for two lettered suffix is sdzz
3008 *	which is followed by sdaaa.
3009 *
3010 *	This is basically 26 base counting with one extra 'nil' entry
3011 *	at the beginning from the second digit on and can be
3012 *	determined using similar method as 26 base conversion with the
3013 *	index shifted -1 after each digit is computed.
3014 *
3015 *	CONTEXT:
3016 *	Don't care.
3017 *
3018 *	RETURNS:
3019 *	0 on success, -errno on failure.
3020 */
3021static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3022{
3023	const int base = 'z' - 'a' + 1;
3024	char *begin = buf + strlen(prefix);
3025	char *end = buf + buflen;
3026	char *p;
3027	int unit;
3028
3029	p = end - 1;
3030	*p = '\0';
3031	unit = base;
3032	do {
3033		if (p == begin)
3034			return -EINVAL;
3035		*--p = 'a' + (index % unit);
3036		index = (index / unit) - 1;
3037	} while (index >= 0);
3038
3039	memmove(begin, p, end - p);
3040	memcpy(buf, prefix, strlen(prefix));
3041
3042	return 0;
3043}
3044
3045/*
3046 * The asynchronous part of sd_probe
3047 */
3048static void sd_probe_async(void *data, async_cookie_t cookie)
3049{
3050	struct scsi_disk *sdkp = data;
3051	struct scsi_device *sdp;
3052	struct gendisk *gd;
3053	u32 index;
3054	struct device *dev;
3055
3056	sdp = sdkp->device;
3057	gd = sdkp->disk;
3058	index = sdkp->index;
3059	dev = &sdp->sdev_gendev;
3060
3061	gd->major = sd_major((index & 0xf0) >> 4);
3062	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3063	gd->minors = SD_MINORS;
3064
3065	gd->fops = &sd_fops;
3066	gd->private_data = &sdkp->driver;
3067	gd->queue = sdkp->device->request_queue;
3068
3069	/* defaults, until the device tells us otherwise */
3070	sdp->sector_size = 512;
3071	sdkp->capacity = 0;
3072	sdkp->media_present = 1;
3073	sdkp->write_prot = 0;
3074	sdkp->cache_override = 0;
3075	sdkp->WCE = 0;
3076	sdkp->RCD = 0;
3077	sdkp->ATO = 0;
3078	sdkp->first_scan = 1;
3079	sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3080
3081	sd_revalidate_disk(gd);
3082
3083	gd->flags = GENHD_FL_EXT_DEVT;
3084	if (sdp->removable) {
3085		gd->flags |= GENHD_FL_REMOVABLE;
3086		gd->events |= DISK_EVENT_MEDIA_CHANGE;
3087	}
3088
3089	blk_pm_runtime_init(sdp->request_queue, dev);
3090	device_add_disk(dev, gd);
3091	if (sdkp->capacity)
3092		sd_dif_config_host(sdkp);
3093
3094	sd_revalidate_disk(gd);
3095
3096	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3097		  sdp->removable ? "removable " : "");
3098	scsi_autopm_put_device(sdp);
3099	put_device(&sdkp->dev);
3100}
3101
3102/**
3103 *	sd_probe - called during driver initialization and whenever a
3104 *	new scsi device is attached to the system. It is called once
3105 *	for each scsi device (not just disks) present.
3106 *	@dev: pointer to device object
3107 *
3108 *	Returns 0 if successful (or not interested in this scsi device 
3109 *	(e.g. scanner)); 1 when there is an error.
3110 *
3111 *	Note: this function is invoked from the scsi mid-level.
3112 *	This function sets up the mapping between a given 
3113 *	<host,channel,id,lun> (found in sdp) and new device name 
3114 *	(e.g. /dev/sda). More precisely it is the block device major 
3115 *	and minor number that is chosen here.
3116 *
3117 *	Assume sd_probe is not re-entrant (for time being)
3118 *	Also think about sd_probe() and sd_remove() running coincidentally.
3119 **/
3120static int sd_probe(struct device *dev)
3121{
3122	struct scsi_device *sdp = to_scsi_device(dev);
3123	struct scsi_disk *sdkp;
3124	struct gendisk *gd;
3125	int index;
3126	int error;
3127
3128	scsi_autopm_get_device(sdp);
3129	error = -ENODEV;
3130	if (sdp->type != TYPE_DISK &&
3131	    sdp->type != TYPE_ZBC &&
3132	    sdp->type != TYPE_MOD &&
3133	    sdp->type != TYPE_RBC)
3134		goto out;
3135
3136#ifndef CONFIG_BLK_DEV_ZONED
3137	if (sdp->type == TYPE_ZBC)
3138		goto out;
3139#endif
3140	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3141					"sd_probe\n"));
3142
3143	error = -ENOMEM;
3144	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3145	if (!sdkp)
3146		goto out;
3147
3148	gd = alloc_disk(SD_MINORS);
3149	if (!gd)
3150		goto out_free;
3151
3152	do {
3153		if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3154			goto out_put;
3155
3156		spin_lock(&sd_index_lock);
3157		error = ida_get_new(&sd_index_ida, &index);
3158		spin_unlock(&sd_index_lock);
3159	} while (error == -EAGAIN);
3160
3161	if (error) {
3162		sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3163		goto out_put;
3164	}
3165
3166	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3167	if (error) {
3168		sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3169		goto out_free_index;
3170	}
3171
3172	sdkp->device = sdp;
3173	sdkp->driver = &sd_template;
3174	sdkp->disk = gd;
3175	sdkp->index = index;
3176	atomic_set(&sdkp->openers, 0);
3177	atomic_set(&sdkp->device->ioerr_cnt, 0);
3178
3179	if (!sdp->request_queue->rq_timeout) {
3180		if (sdp->type != TYPE_MOD)
3181			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3182		else
3183			blk_queue_rq_timeout(sdp->request_queue,
3184					     SD_MOD_TIMEOUT);
3185	}
3186
3187	device_initialize(&sdkp->dev);
3188	sdkp->dev.parent = dev;
3189	sdkp->dev.class = &sd_disk_class;
3190	dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3191
3192	error = device_add(&sdkp->dev);
3193	if (error)
3194		goto out_free_index;
3195
3196	get_device(dev);
3197	dev_set_drvdata(dev, sdkp);
3198
3199	get_device(&sdkp->dev);	/* prevent release before async_schedule */
3200	async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3201
3202	return 0;
3203
3204 out_free_index:
3205	spin_lock(&sd_index_lock);
3206	ida_remove(&sd_index_ida, index);
3207	spin_unlock(&sd_index_lock);
3208 out_put:
3209	put_disk(gd);
3210 out_free:
3211	kfree(sdkp);
3212 out:
3213	scsi_autopm_put_device(sdp);
3214	return error;
3215}
3216
3217/**
3218 *	sd_remove - called whenever a scsi disk (previously recognized by
3219 *	sd_probe) is detached from the system. It is called (potentially
3220 *	multiple times) during sd module unload.
3221 *	@sdp: pointer to mid level scsi device object
3222 *
3223 *	Note: this function is invoked from the scsi mid-level.
3224 *	This function potentially frees up a device name (e.g. /dev/sdc)
3225 *	that could be re-used by a subsequent sd_probe().
3226 *	This function is not called when the built-in sd driver is "exit-ed".
3227 **/
3228static int sd_remove(struct device *dev)
3229{
3230	struct scsi_disk *sdkp;
3231	dev_t devt;
3232
3233	sdkp = dev_get_drvdata(dev);
3234	devt = disk_devt(sdkp->disk);
3235	scsi_autopm_get_device(sdkp->device);
3236
3237	async_synchronize_full_domain(&scsi_sd_pm_domain);
3238	async_synchronize_full_domain(&scsi_sd_probe_domain);
3239	device_del(&sdkp->dev);
3240	del_gendisk(sdkp->disk);
3241	sd_shutdown(dev);
3242
3243	sd_zbc_remove(sdkp);
3244
3245	blk_register_region(devt, SD_MINORS, NULL,
3246			    sd_default_probe, NULL, NULL);
3247
3248	mutex_lock(&sd_ref_mutex);
3249	dev_set_drvdata(dev, NULL);
3250	put_device(&sdkp->dev);
3251	mutex_unlock(&sd_ref_mutex);
3252
3253	return 0;
3254}
3255
3256/**
3257 *	scsi_disk_release - Called to free the scsi_disk structure
3258 *	@dev: pointer to embedded class device
3259 *
3260 *	sd_ref_mutex must be held entering this routine.  Because it is
3261 *	called on last put, you should always use the scsi_disk_get()
3262 *	scsi_disk_put() helpers which manipulate the semaphore directly
3263 *	and never do a direct put_device.
3264 **/
3265static void scsi_disk_release(struct device *dev)
3266{
3267	struct scsi_disk *sdkp = to_scsi_disk(dev);
3268	struct gendisk *disk = sdkp->disk;
3269	
3270	spin_lock(&sd_index_lock);
3271	ida_remove(&sd_index_ida, sdkp->index);
3272	spin_unlock(&sd_index_lock);
 
 
 
 
 
 
 
 
 
 
3273
3274	disk->private_data = NULL;
3275	put_disk(disk);
3276	put_device(&sdkp->device->sdev_gendev);
3277
3278	kfree(sdkp);
3279}
3280
3281static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3282{
3283	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
3284	struct scsi_sense_hdr sshdr;
3285	struct scsi_device *sdp = sdkp->device;
3286	int res;
3287
3288	if (start)
3289		cmd[4] |= 1;	/* START */
3290
3291	if (sdp->start_stop_pwr_cond)
3292		cmd[4] |= start ? 1 << 4 : 3 << 4;	/* Active or Standby */
3293
3294	if (!scsi_device_online(sdp))
3295		return -ENODEV;
3296
3297	res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3298			       SD_TIMEOUT, SD_MAX_RETRIES, NULL, 0, RQF_PM);
3299	if (res) {
3300		sd_print_result(sdkp, "Start/Stop Unit failed", res);
3301		if (driver_byte(res) & DRIVER_SENSE)
3302			sd_print_sense_hdr(sdkp, &sshdr);
3303		if (scsi_sense_valid(&sshdr) &&
3304			/* 0x3a is medium not present */
3305			sshdr.asc == 0x3a)
3306			res = 0;
3307	}
3308
3309	/* SCSI error codes must not go to the generic layer */
3310	if (res)
3311		return -EIO;
3312
3313	return 0;
3314}
3315
3316/*
3317 * Send a SYNCHRONIZE CACHE instruction down to the device through
3318 * the normal SCSI command structure.  Wait for the command to
3319 * complete.
3320 */
3321static void sd_shutdown(struct device *dev)
3322{
3323	struct scsi_disk *sdkp = dev_get_drvdata(dev);
3324
3325	if (!sdkp)
3326		return;         /* this can happen */
3327
3328	if (pm_runtime_suspended(dev))
3329		return;
3330
3331	if (sdkp->WCE && sdkp->media_present) {
3332		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3333		sd_sync_cache(sdkp);
3334	}
3335
3336	if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3337		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3338		sd_start_stop_device(sdkp, 0);
3339	}
3340}
3341
3342static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3343{
3344	struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
3345	int ret = 0;
3346
3347	if (!sdkp)	/* E.g.: runtime suspend following sd_remove() */
3348		return 0;
3349
3350	if (sdkp->WCE && sdkp->media_present) {
3351		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3352		ret = sd_sync_cache(sdkp);
 
3353		if (ret) {
3354			/* ignore OFFLINE device */
3355			if (ret == -ENODEV)
3356				ret = 0;
3357			goto done;
 
 
 
 
 
 
 
 
 
 
3358		}
3359	}
3360
3361	if (sdkp->device->manage_start_stop) {
3362		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3363		/* an error is not worth aborting a system sleep */
3364		ret = sd_start_stop_device(sdkp, 0);
3365		if (ignore_stop_errors)
3366			ret = 0;
3367	}
3368
3369done:
3370	return ret;
3371}
3372
3373static int sd_suspend_system(struct device *dev)
3374{
3375	return sd_suspend_common(dev, true);
3376}
3377
3378static int sd_suspend_runtime(struct device *dev)
3379{
3380	return sd_suspend_common(dev, false);
3381}
3382
3383static int sd_resume(struct device *dev)
3384{
3385	struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
3386
3387	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
3388		return 0;
3389
3390	if (!sdkp->device->manage_start_stop)
3391		return 0;
3392
3393	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3394	return sd_start_stop_device(sdkp, 1);
 
 
 
3395}
3396
3397/**
3398 *	init_sd - entry point for this driver (both when built in or when
3399 *	a module).
3400 *
3401 *	Note: this function registers this driver with the scsi mid-level.
3402 **/
3403static int __init init_sd(void)
3404{
3405	int majors = 0, i, err;
3406
3407	SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3408
3409	for (i = 0; i < SD_MAJORS; i++) {
3410		if (register_blkdev(sd_major(i), "sd") != 0)
3411			continue;
3412		majors++;
3413		blk_register_region(sd_major(i), SD_MINORS, NULL,
3414				    sd_default_probe, NULL, NULL);
3415	}
3416
3417	if (!majors)
3418		return -ENODEV;
3419
3420	err = class_register(&sd_disk_class);
3421	if (err)
3422		goto err_out;
3423
3424	sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3425					 0, 0, NULL);
3426	if (!sd_cdb_cache) {
3427		printk(KERN_ERR "sd: can't init extended cdb cache\n");
3428		err = -ENOMEM;
3429		goto err_out_class;
3430	}
3431
3432	sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3433	if (!sd_cdb_pool) {
3434		printk(KERN_ERR "sd: can't init extended cdb pool\n");
3435		err = -ENOMEM;
3436		goto err_out_cache;
3437	}
3438
 
 
 
 
 
 
 
3439	err = scsi_register_driver(&sd_template.gendrv);
3440	if (err)
3441		goto err_out_driver;
3442
3443	return 0;
3444
3445err_out_driver:
 
 
 
3446	mempool_destroy(sd_cdb_pool);
3447
3448err_out_cache:
3449	kmem_cache_destroy(sd_cdb_cache);
3450
3451err_out_class:
3452	class_unregister(&sd_disk_class);
3453err_out:
3454	for (i = 0; i < SD_MAJORS; i++)
3455		unregister_blkdev(sd_major(i), "sd");
3456	return err;
3457}
3458
3459/**
3460 *	exit_sd - exit point for this driver (when it is a module).
3461 *
3462 *	Note: this function unregisters this driver from the scsi mid-level.
3463 **/
3464static void __exit exit_sd(void)
3465{
3466	int i;
3467
3468	SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3469
3470	scsi_unregister_driver(&sd_template.gendrv);
3471	mempool_destroy(sd_cdb_pool);
 
3472	kmem_cache_destroy(sd_cdb_cache);
3473
3474	class_unregister(&sd_disk_class);
3475
3476	for (i = 0; i < SD_MAJORS; i++) {
3477		blk_unregister_region(sd_major(i), SD_MINORS);
3478		unregister_blkdev(sd_major(i), "sd");
3479	}
3480}
3481
3482module_init(init_sd);
3483module_exit(exit_sd);
3484
3485static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3486			       struct scsi_sense_hdr *sshdr)
3487{
3488	scsi_print_sense_hdr(sdkp->device,
3489			     sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3490}
3491
3492static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3493			    int result)
3494{
3495	const char *hb_string = scsi_hostbyte_string(result);
3496	const char *db_string = scsi_driverbyte_string(result);
3497
3498	if (hb_string || db_string)
3499		sd_printk(KERN_INFO, sdkp,
3500			  "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3501			  hb_string ? hb_string : "invalid",
3502			  db_string ? db_string : "invalid");
3503	else
3504		sd_printk(KERN_INFO, sdkp,
3505			  "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3506			  msg, host_byte(result), driver_byte(result));
3507}
3508
v5.4
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *      sd.c Copyright (C) 1992 Drew Eckhardt
   4 *           Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
   5 *
   6 *      Linux scsi disk driver
   7 *              Initial versions: Drew Eckhardt
   8 *              Subsequent revisions: Eric Youngdale
   9 *	Modification history:
  10 *       - Drew Eckhardt <drew@colorado.edu> original
  11 *       - Eric Youngdale <eric@andante.org> add scatter-gather, multiple 
  12 *         outstanding request, and other enhancements.
  13 *         Support loadable low-level scsi drivers.
  14 *       - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using 
  15 *         eight major numbers.
  16 *       - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
  17 *	 - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in 
  18 *	   sd_init and cleanups.
  19 *	 - Alex Davis <letmein@erols.com> Fix problem where partition info
  20 *	   not being read in sd_open. Fix problem where removable media 
  21 *	   could be ejected after sd_open.
  22 *	 - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
  23 *	 - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox 
  24 *	   <willy@debian.org>, Kurt Garloff <garloff@suse.de>: 
  25 *	   Support 32k/1M disks.
  26 *
  27 *	Logging policy (needs CONFIG_SCSI_LOGGING defined):
  28 *	 - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
  29 *	 - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
  30 *	 - entering sd_ioctl: SCSI_LOG_IOCTL level 1
  31 *	 - entering other commands: SCSI_LOG_HLQUEUE level 3
  32 *	Note: when the logging level is set by the user, it must be greater
  33 *	than the level indicated above to trigger output.	
  34 */
  35
  36#include <linux/module.h>
  37#include <linux/fs.h>
  38#include <linux/kernel.h>
  39#include <linux/mm.h>
  40#include <linux/bio.h>
  41#include <linux/genhd.h>
  42#include <linux/hdreg.h>
  43#include <linux/errno.h>
  44#include <linux/idr.h>
  45#include <linux/interrupt.h>
  46#include <linux/init.h>
  47#include <linux/blkdev.h>
  48#include <linux/blkpg.h>
  49#include <linux/blk-pm.h>
  50#include <linux/delay.h>
  51#include <linux/mutex.h>
  52#include <linux/string_helpers.h>
  53#include <linux/async.h>
  54#include <linux/slab.h>
  55#include <linux/sed-opal.h>
  56#include <linux/pm_runtime.h>
  57#include <linux/pr.h>
  58#include <linux/t10-pi.h>
  59#include <linux/uaccess.h>
  60#include <asm/unaligned.h>
  61
  62#include <scsi/scsi.h>
  63#include <scsi/scsi_cmnd.h>
  64#include <scsi/scsi_dbg.h>
  65#include <scsi/scsi_device.h>
  66#include <scsi/scsi_driver.h>
  67#include <scsi/scsi_eh.h>
  68#include <scsi/scsi_host.h>
  69#include <scsi/scsi_ioctl.h>
  70#include <scsi/scsicam.h>
  71
  72#include "sd.h"
  73#include "scsi_priv.h"
  74#include "scsi_logging.h"
  75
  76MODULE_AUTHOR("Eric Youngdale");
  77MODULE_DESCRIPTION("SCSI disk (sd) driver");
  78MODULE_LICENSE("GPL");
  79
  80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
  81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
  82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
  83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
  84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
  85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
  86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
  87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
  88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
  89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
  90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
  91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
  92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
  93MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
  94MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
  95MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
  96MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
  97MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
  98MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
  99MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
 100
 101#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
 102#define SD_MINORS	16
 103#else
 104#define SD_MINORS	0
 105#endif
 106
 107static void sd_config_discard(struct scsi_disk *, unsigned int);
 108static void sd_config_write_same(struct scsi_disk *);
 109static int  sd_revalidate_disk(struct gendisk *);
 110static void sd_unlock_native_capacity(struct gendisk *disk);
 111static int  sd_probe(struct device *);
 112static int  sd_remove(struct device *);
 113static void sd_shutdown(struct device *);
 114static int sd_suspend_system(struct device *);
 115static int sd_suspend_runtime(struct device *);
 116static int sd_resume(struct device *);
 117static void sd_rescan(struct device *);
 118static blk_status_t sd_init_command(struct scsi_cmnd *SCpnt);
 119static void sd_uninit_command(struct scsi_cmnd *SCpnt);
 120static int sd_done(struct scsi_cmnd *);
 121static void sd_eh_reset(struct scsi_cmnd *);
 122static int sd_eh_action(struct scsi_cmnd *, int);
 123static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
 124static void scsi_disk_release(struct device *cdev);
 125static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
 126static void sd_print_result(const struct scsi_disk *, const char *, int);
 127
 
 128static DEFINE_IDA(sd_index_ida);
 129
 130/* This semaphore is used to mediate the 0->1 reference get in the
 131 * face of object destruction (i.e. we can't allow a get on an
 132 * object after last put) */
 133static DEFINE_MUTEX(sd_ref_mutex);
 134
 135static struct kmem_cache *sd_cdb_cache;
 136static mempool_t *sd_cdb_pool;
 137static mempool_t *sd_page_pool;
 138
 139static const char *sd_cache_types[] = {
 140	"write through", "none", "write back",
 141	"write back, no read (daft)"
 142};
 143
 144static void sd_set_flush_flag(struct scsi_disk *sdkp)
 145{
 146	bool wc = false, fua = false;
 147
 148	if (sdkp->WCE) {
 149		wc = true;
 150		if (sdkp->DPOFUA)
 151			fua = true;
 152	}
 153
 154	blk_queue_write_cache(sdkp->disk->queue, wc, fua);
 155}
 156
 157static ssize_t
 158cache_type_store(struct device *dev, struct device_attribute *attr,
 159		 const char *buf, size_t count)
 160{
 161	int ct, rcd, wce, sp;
 162	struct scsi_disk *sdkp = to_scsi_disk(dev);
 163	struct scsi_device *sdp = sdkp->device;
 164	char buffer[64];
 165	char *buffer_data;
 166	struct scsi_mode_data data;
 167	struct scsi_sense_hdr sshdr;
 168	static const char temp[] = "temporary ";
 169	int len;
 170
 171	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 172		/* no cache control on RBC devices; theoretically they
 173		 * can do it, but there's probably so many exceptions
 174		 * it's not worth the risk */
 175		return -EINVAL;
 176
 177	if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
 178		buf += sizeof(temp) - 1;
 179		sdkp->cache_override = 1;
 180	} else {
 181		sdkp->cache_override = 0;
 182	}
 183
 184	ct = sysfs_match_string(sd_cache_types, buf);
 
 
 
 
 
 
 
 185	if (ct < 0)
 186		return -EINVAL;
 187
 188	rcd = ct & 0x01 ? 1 : 0;
 189	wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
 190
 191	if (sdkp->cache_override) {
 192		sdkp->WCE = wce;
 193		sdkp->RCD = rcd;
 194		sd_set_flush_flag(sdkp);
 195		return count;
 196	}
 197
 198	if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
 199			    SD_MAX_RETRIES, &data, NULL))
 200		return -EINVAL;
 201	len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
 202		  data.block_descriptor_length);
 203	buffer_data = buffer + data.header_length +
 204		data.block_descriptor_length;
 205	buffer_data[2] &= ~0x05;
 206	buffer_data[2] |= wce << 2 | rcd;
 207	sp = buffer_data[0] & 0x80 ? 1 : 0;
 208	buffer_data[0] &= ~0x80;
 209
 210	/*
 211	 * Ensure WP, DPOFUA, and RESERVED fields are cleared in
 212	 * received mode parameter buffer before doing MODE SELECT.
 213	 */
 214	data.device_specific = 0;
 215
 216	if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
 217			     SD_MAX_RETRIES, &data, &sshdr)) {
 218		if (scsi_sense_valid(&sshdr))
 219			sd_print_sense_hdr(sdkp, &sshdr);
 220		return -EINVAL;
 221	}
 222	revalidate_disk(sdkp->disk);
 223	return count;
 224}
 225
 226static ssize_t
 227manage_start_stop_show(struct device *dev, struct device_attribute *attr,
 228		       char *buf)
 229{
 230	struct scsi_disk *sdkp = to_scsi_disk(dev);
 231	struct scsi_device *sdp = sdkp->device;
 232
 233	return sprintf(buf, "%u\n", sdp->manage_start_stop);
 234}
 235
 236static ssize_t
 237manage_start_stop_store(struct device *dev, struct device_attribute *attr,
 238			const char *buf, size_t count)
 239{
 240	struct scsi_disk *sdkp = to_scsi_disk(dev);
 241	struct scsi_device *sdp = sdkp->device;
 242	bool v;
 243
 244	if (!capable(CAP_SYS_ADMIN))
 245		return -EACCES;
 246
 247	if (kstrtobool(buf, &v))
 248		return -EINVAL;
 249
 250	sdp->manage_start_stop = v;
 251
 252	return count;
 253}
 254static DEVICE_ATTR_RW(manage_start_stop);
 255
 256static ssize_t
 257allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
 258{
 259	struct scsi_disk *sdkp = to_scsi_disk(dev);
 260
 261	return sprintf(buf, "%u\n", sdkp->device->allow_restart);
 262}
 263
 264static ssize_t
 265allow_restart_store(struct device *dev, struct device_attribute *attr,
 266		    const char *buf, size_t count)
 267{
 268	bool v;
 269	struct scsi_disk *sdkp = to_scsi_disk(dev);
 270	struct scsi_device *sdp = sdkp->device;
 271
 272	if (!capable(CAP_SYS_ADMIN))
 273		return -EACCES;
 274
 275	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 276		return -EINVAL;
 277
 278	if (kstrtobool(buf, &v))
 279		return -EINVAL;
 280
 281	sdp->allow_restart = v;
 282
 283	return count;
 284}
 285static DEVICE_ATTR_RW(allow_restart);
 286
 287static ssize_t
 288cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
 289{
 290	struct scsi_disk *sdkp = to_scsi_disk(dev);
 291	int ct = sdkp->RCD + 2*sdkp->WCE;
 292
 293	return sprintf(buf, "%s\n", sd_cache_types[ct]);
 294}
 295static DEVICE_ATTR_RW(cache_type);
 296
 297static ssize_t
 298FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
 299{
 300	struct scsi_disk *sdkp = to_scsi_disk(dev);
 301
 302	return sprintf(buf, "%u\n", sdkp->DPOFUA);
 303}
 304static DEVICE_ATTR_RO(FUA);
 305
 306static ssize_t
 307protection_type_show(struct device *dev, struct device_attribute *attr,
 308		     char *buf)
 309{
 310	struct scsi_disk *sdkp = to_scsi_disk(dev);
 311
 312	return sprintf(buf, "%u\n", sdkp->protection_type);
 313}
 314
 315static ssize_t
 316protection_type_store(struct device *dev, struct device_attribute *attr,
 317		      const char *buf, size_t count)
 318{
 319	struct scsi_disk *sdkp = to_scsi_disk(dev);
 320	unsigned int val;
 321	int err;
 322
 323	if (!capable(CAP_SYS_ADMIN))
 324		return -EACCES;
 325
 326	err = kstrtouint(buf, 10, &val);
 327
 328	if (err)
 329		return err;
 330
 331	if (val <= T10_PI_TYPE3_PROTECTION)
 332		sdkp->protection_type = val;
 333
 334	return count;
 335}
 336static DEVICE_ATTR_RW(protection_type);
 337
 338static ssize_t
 339protection_mode_show(struct device *dev, struct device_attribute *attr,
 340		     char *buf)
 341{
 342	struct scsi_disk *sdkp = to_scsi_disk(dev);
 343	struct scsi_device *sdp = sdkp->device;
 344	unsigned int dif, dix;
 345
 346	dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
 347	dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
 348
 349	if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
 350		dif = 0;
 351		dix = 1;
 352	}
 353
 354	if (!dif && !dix)
 355		return sprintf(buf, "none\n");
 356
 357	return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
 358}
 359static DEVICE_ATTR_RO(protection_mode);
 360
 361static ssize_t
 362app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
 363{
 364	struct scsi_disk *sdkp = to_scsi_disk(dev);
 365
 366	return sprintf(buf, "%u\n", sdkp->ATO);
 367}
 368static DEVICE_ATTR_RO(app_tag_own);
 369
 370static ssize_t
 371thin_provisioning_show(struct device *dev, struct device_attribute *attr,
 372		       char *buf)
 373{
 374	struct scsi_disk *sdkp = to_scsi_disk(dev);
 375
 376	return sprintf(buf, "%u\n", sdkp->lbpme);
 377}
 378static DEVICE_ATTR_RO(thin_provisioning);
 379
 380/* sysfs_match_string() requires dense arrays */
 381static const char *lbp_mode[] = {
 382	[SD_LBP_FULL]		= "full",
 383	[SD_LBP_UNMAP]		= "unmap",
 384	[SD_LBP_WS16]		= "writesame_16",
 385	[SD_LBP_WS10]		= "writesame_10",
 386	[SD_LBP_ZERO]		= "writesame_zero",
 387	[SD_LBP_DISABLE]	= "disabled",
 388};
 389
 390static ssize_t
 391provisioning_mode_show(struct device *dev, struct device_attribute *attr,
 392		       char *buf)
 393{
 394	struct scsi_disk *sdkp = to_scsi_disk(dev);
 395
 396	return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
 397}
 398
 399static ssize_t
 400provisioning_mode_store(struct device *dev, struct device_attribute *attr,
 401			const char *buf, size_t count)
 402{
 403	struct scsi_disk *sdkp = to_scsi_disk(dev);
 404	struct scsi_device *sdp = sdkp->device;
 405	int mode;
 406
 407	if (!capable(CAP_SYS_ADMIN))
 408		return -EACCES;
 409
 410	if (sd_is_zoned(sdkp)) {
 411		sd_config_discard(sdkp, SD_LBP_DISABLE);
 412		return count;
 413	}
 414
 415	if (sdp->type != TYPE_DISK)
 416		return -EINVAL;
 417
 418	mode = sysfs_match_string(lbp_mode, buf);
 419	if (mode < 0)
 
 
 
 
 
 
 
 
 
 420		return -EINVAL;
 421
 422	sd_config_discard(sdkp, mode);
 423
 424	return count;
 425}
 426static DEVICE_ATTR_RW(provisioning_mode);
 427
 428/* sysfs_match_string() requires dense arrays */
 429static const char *zeroing_mode[] = {
 430	[SD_ZERO_WRITE]		= "write",
 431	[SD_ZERO_WS]		= "writesame",
 432	[SD_ZERO_WS16_UNMAP]	= "writesame_16_unmap",
 433	[SD_ZERO_WS10_UNMAP]	= "writesame_10_unmap",
 434};
 435
 436static ssize_t
 437zeroing_mode_show(struct device *dev, struct device_attribute *attr,
 438		  char *buf)
 439{
 440	struct scsi_disk *sdkp = to_scsi_disk(dev);
 441
 442	return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
 443}
 444
 445static ssize_t
 446zeroing_mode_store(struct device *dev, struct device_attribute *attr,
 447		   const char *buf, size_t count)
 448{
 449	struct scsi_disk *sdkp = to_scsi_disk(dev);
 450	int mode;
 451
 452	if (!capable(CAP_SYS_ADMIN))
 453		return -EACCES;
 454
 455	mode = sysfs_match_string(zeroing_mode, buf);
 456	if (mode < 0)
 457		return -EINVAL;
 458
 459	sdkp->zeroing_mode = mode;
 460
 461	return count;
 462}
 463static DEVICE_ATTR_RW(zeroing_mode);
 464
 465static ssize_t
 466max_medium_access_timeouts_show(struct device *dev,
 467				struct device_attribute *attr, char *buf)
 468{
 469	struct scsi_disk *sdkp = to_scsi_disk(dev);
 470
 471	return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
 472}
 473
 474static ssize_t
 475max_medium_access_timeouts_store(struct device *dev,
 476				 struct device_attribute *attr, const char *buf,
 477				 size_t count)
 478{
 479	struct scsi_disk *sdkp = to_scsi_disk(dev);
 480	int err;
 481
 482	if (!capable(CAP_SYS_ADMIN))
 483		return -EACCES;
 484
 485	err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
 486
 487	return err ? err : count;
 488}
 489static DEVICE_ATTR_RW(max_medium_access_timeouts);
 490
 491static ssize_t
 492max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
 493			   char *buf)
 494{
 495	struct scsi_disk *sdkp = to_scsi_disk(dev);
 496
 497	return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
 498}
 499
 500static ssize_t
 501max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
 502			    const char *buf, size_t count)
 503{
 504	struct scsi_disk *sdkp = to_scsi_disk(dev);
 505	struct scsi_device *sdp = sdkp->device;
 506	unsigned long max;
 507	int err;
 508
 509	if (!capable(CAP_SYS_ADMIN))
 510		return -EACCES;
 511
 512	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
 513		return -EINVAL;
 514
 515	err = kstrtoul(buf, 10, &max);
 516
 517	if (err)
 518		return err;
 519
 520	if (max == 0)
 521		sdp->no_write_same = 1;
 522	else if (max <= SD_MAX_WS16_BLOCKS) {
 523		sdp->no_write_same = 0;
 524		sdkp->max_ws_blocks = max;
 525	}
 526
 527	sd_config_write_same(sdkp);
 528
 529	return count;
 530}
 531static DEVICE_ATTR_RW(max_write_same_blocks);
 532
 533static struct attribute *sd_disk_attrs[] = {
 534	&dev_attr_cache_type.attr,
 535	&dev_attr_FUA.attr,
 536	&dev_attr_allow_restart.attr,
 537	&dev_attr_manage_start_stop.attr,
 538	&dev_attr_protection_type.attr,
 539	&dev_attr_protection_mode.attr,
 540	&dev_attr_app_tag_own.attr,
 541	&dev_attr_thin_provisioning.attr,
 542	&dev_attr_provisioning_mode.attr,
 543	&dev_attr_zeroing_mode.attr,
 544	&dev_attr_max_write_same_blocks.attr,
 545	&dev_attr_max_medium_access_timeouts.attr,
 546	NULL,
 547};
 548ATTRIBUTE_GROUPS(sd_disk);
 549
 550static struct class sd_disk_class = {
 551	.name		= "scsi_disk",
 552	.owner		= THIS_MODULE,
 553	.dev_release	= scsi_disk_release,
 554	.dev_groups	= sd_disk_groups,
 555};
 556
 557static const struct dev_pm_ops sd_pm_ops = {
 558	.suspend		= sd_suspend_system,
 559	.resume			= sd_resume,
 560	.poweroff		= sd_suspend_system,
 561	.restore		= sd_resume,
 562	.runtime_suspend	= sd_suspend_runtime,
 563	.runtime_resume		= sd_resume,
 564};
 565
 566static struct scsi_driver sd_template = {
 567	.gendrv = {
 568		.name		= "sd",
 569		.owner		= THIS_MODULE,
 570		.probe		= sd_probe,
 571		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
 572		.remove		= sd_remove,
 573		.shutdown	= sd_shutdown,
 574		.pm		= &sd_pm_ops,
 575	},
 576	.rescan			= sd_rescan,
 577	.init_command		= sd_init_command,
 578	.uninit_command		= sd_uninit_command,
 579	.done			= sd_done,
 580	.eh_action		= sd_eh_action,
 581	.eh_reset		= sd_eh_reset,
 582};
 583
 584/*
 585 * Dummy kobj_map->probe function.
 586 * The default ->probe function will call modprobe, which is
 587 * pointless as this module is already loaded.
 588 */
 589static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
 590{
 591	return NULL;
 592}
 593
 594/*
 595 * Device no to disk mapping:
 596 * 
 597 *       major         disc2     disc  p1
 598 *   |............|.............|....|....| <- dev_t
 599 *    31        20 19          8 7  4 3  0
 600 * 
 601 * Inside a major, we have 16k disks, however mapped non-
 602 * contiguously. The first 16 disks are for major0, the next
 603 * ones with major1, ... Disk 256 is for major0 again, disk 272 
 604 * for major1, ... 
 605 * As we stay compatible with our numbering scheme, we can reuse 
 606 * the well-know SCSI majors 8, 65--71, 136--143.
 607 */
 608static int sd_major(int major_idx)
 609{
 610	switch (major_idx) {
 611	case 0:
 612		return SCSI_DISK0_MAJOR;
 613	case 1 ... 7:
 614		return SCSI_DISK1_MAJOR + major_idx - 1;
 615	case 8 ... 15:
 616		return SCSI_DISK8_MAJOR + major_idx - 8;
 617	default:
 618		BUG();
 619		return 0;	/* shut up gcc */
 620	}
 621}
 622
 623static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
 624{
 625	struct scsi_disk *sdkp = NULL;
 626
 627	mutex_lock(&sd_ref_mutex);
 628
 629	if (disk->private_data) {
 630		sdkp = scsi_disk(disk);
 631		if (scsi_device_get(sdkp->device) == 0)
 632			get_device(&sdkp->dev);
 633		else
 634			sdkp = NULL;
 635	}
 636	mutex_unlock(&sd_ref_mutex);
 637	return sdkp;
 638}
 639
 640static void scsi_disk_put(struct scsi_disk *sdkp)
 641{
 642	struct scsi_device *sdev = sdkp->device;
 643
 644	mutex_lock(&sd_ref_mutex);
 645	put_device(&sdkp->dev);
 646	scsi_device_put(sdev);
 647	mutex_unlock(&sd_ref_mutex);
 648}
 649
 650#ifdef CONFIG_BLK_SED_OPAL
 651static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
 652		size_t len, bool send)
 653{
 654	struct scsi_device *sdev = data;
 655	u8 cdb[12] = { 0, };
 656	int ret;
 657
 658	cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
 659	cdb[1] = secp;
 660	put_unaligned_be16(spsp, &cdb[2]);
 661	put_unaligned_be32(len, &cdb[6]);
 662
 663	ret = scsi_execute_req(sdev, cdb,
 664			send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
 665			buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
 666	return ret <= 0 ? ret : -EIO;
 667}
 668#endif /* CONFIG_BLK_SED_OPAL */
 669
 670/*
 671 * Look up the DIX operation based on whether the command is read or
 672 * write and whether dix and dif are enabled.
 673 */
 674static unsigned int sd_prot_op(bool write, bool dix, bool dif)
 675{
 676	/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
 677	static const unsigned int ops[] = {	/* wrt dix dif */
 678		SCSI_PROT_NORMAL,		/*  0	0   0  */
 679		SCSI_PROT_READ_STRIP,		/*  0	0   1  */
 680		SCSI_PROT_READ_INSERT,		/*  0	1   0  */
 681		SCSI_PROT_READ_PASS,		/*  0	1   1  */
 682		SCSI_PROT_NORMAL,		/*  1	0   0  */
 683		SCSI_PROT_WRITE_INSERT,		/*  1	0   1  */
 684		SCSI_PROT_WRITE_STRIP,		/*  1	1   0  */
 685		SCSI_PROT_WRITE_PASS,		/*  1	1   1  */
 686	};
 687
 688	return ops[write << 2 | dix << 1 | dif];
 689}
 690
 691/*
 692 * Returns a mask of the protection flags that are valid for a given DIX
 693 * operation.
 694 */
 695static unsigned int sd_prot_flag_mask(unsigned int prot_op)
 696{
 697	static const unsigned int flag_mask[] = {
 698		[SCSI_PROT_NORMAL]		= 0,
 699
 700		[SCSI_PROT_READ_STRIP]		= SCSI_PROT_TRANSFER_PI |
 701						  SCSI_PROT_GUARD_CHECK |
 702						  SCSI_PROT_REF_CHECK |
 703						  SCSI_PROT_REF_INCREMENT,
 704
 705		[SCSI_PROT_READ_INSERT]		= SCSI_PROT_REF_INCREMENT |
 706						  SCSI_PROT_IP_CHECKSUM,
 707
 708		[SCSI_PROT_READ_PASS]		= SCSI_PROT_TRANSFER_PI |
 709						  SCSI_PROT_GUARD_CHECK |
 710						  SCSI_PROT_REF_CHECK |
 711						  SCSI_PROT_REF_INCREMENT |
 712						  SCSI_PROT_IP_CHECKSUM,
 713
 714		[SCSI_PROT_WRITE_INSERT]	= SCSI_PROT_TRANSFER_PI |
 715						  SCSI_PROT_REF_INCREMENT,
 716
 717		[SCSI_PROT_WRITE_STRIP]		= SCSI_PROT_GUARD_CHECK |
 718						  SCSI_PROT_REF_CHECK |
 719						  SCSI_PROT_REF_INCREMENT |
 720						  SCSI_PROT_IP_CHECKSUM,
 721
 722		[SCSI_PROT_WRITE_PASS]		= SCSI_PROT_TRANSFER_PI |
 723						  SCSI_PROT_GUARD_CHECK |
 724						  SCSI_PROT_REF_CHECK |
 725						  SCSI_PROT_REF_INCREMENT |
 726						  SCSI_PROT_IP_CHECKSUM,
 727	};
 728
 729	return flag_mask[prot_op];
 730}
 731
 732static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
 733					   unsigned int dix, unsigned int dif)
 734{
 735	struct bio *bio = scmd->request->bio;
 736	unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
 737	unsigned int protect = 0;
 738
 739	if (dix) {				/* DIX Type 0, 1, 2, 3 */
 740		if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
 741			scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
 742
 743		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 744			scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
 745	}
 746
 747	if (dif != T10_PI_TYPE3_PROTECTION) {	/* DIX/DIF Type 0, 1, 2 */
 748		scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
 749
 750		if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
 751			scmd->prot_flags |= SCSI_PROT_REF_CHECK;
 752	}
 753
 754	if (dif) {				/* DIX/DIF Type 1, 2, 3 */
 755		scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
 756
 757		if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
 758			protect = 3 << 5;	/* Disable target PI checking */
 759		else
 760			protect = 1 << 5;	/* Enable target PI checking */
 761	}
 762
 763	scsi_set_prot_op(scmd, prot_op);
 764	scsi_set_prot_type(scmd, dif);
 765	scmd->prot_flags &= sd_prot_flag_mask(prot_op);
 766
 767	return protect;
 768}
 769
 770static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
 771{
 772	struct request_queue *q = sdkp->disk->queue;
 773	unsigned int logical_block_size = sdkp->device->sector_size;
 774	unsigned int max_blocks = 0;
 775
 776	q->limits.discard_alignment =
 777		sdkp->unmap_alignment * logical_block_size;
 778	q->limits.discard_granularity =
 779		max(sdkp->physical_block_size,
 780		    sdkp->unmap_granularity * logical_block_size);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 781	sdkp->provisioning_mode = mode;
 782
 783	switch (mode) {
 784
 785	case SD_LBP_FULL:
 786	case SD_LBP_DISABLE:
 787		blk_queue_max_discard_sectors(q, 0);
 788		blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
 789		return;
 790
 791	case SD_LBP_UNMAP:
 792		max_blocks = min_not_zero(sdkp->max_unmap_blocks,
 793					  (u32)SD_MAX_WS16_BLOCKS);
 794		break;
 795
 796	case SD_LBP_WS16:
 797		if (sdkp->device->unmap_limit_for_ws)
 798			max_blocks = sdkp->max_unmap_blocks;
 799		else
 800			max_blocks = sdkp->max_ws_blocks;
 801
 802		max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
 803		break;
 804
 805	case SD_LBP_WS10:
 806		if (sdkp->device->unmap_limit_for_ws)
 807			max_blocks = sdkp->max_unmap_blocks;
 808		else
 809			max_blocks = sdkp->max_ws_blocks;
 810
 811		max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
 812		break;
 813
 814	case SD_LBP_ZERO:
 815		max_blocks = min_not_zero(sdkp->max_ws_blocks,
 816					  (u32)SD_MAX_WS10_BLOCKS);
 
 817		break;
 818	}
 819
 820	blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
 821	blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
 822}
 823
 824static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
 
 
 
 
 
 
 
 
 825{
 
 826	struct scsi_device *sdp = cmd->device;
 827	struct request *rq = cmd->request;
 828	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 829	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 830	unsigned int data_len = 24;
 
 831	char *buf;
 
 832
 833	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 834	if (!rq->special_vec.bv_page)
 835		return BLK_STS_RESOURCE;
 836	clear_highpage(rq->special_vec.bv_page);
 837	rq->special_vec.bv_offset = 0;
 838	rq->special_vec.bv_len = data_len;
 839	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 840
 841	cmd->cmd_len = 10;
 842	cmd->cmnd[0] = UNMAP;
 843	cmd->cmnd[8] = 24;
 844
 845	buf = page_address(rq->special_vec.bv_page);
 846	put_unaligned_be16(6 + 16, &buf[0]);
 847	put_unaligned_be16(16, &buf[2]);
 848	put_unaligned_be64(lba, &buf[8]);
 849	put_unaligned_be32(nr_blocks, &buf[16]);
 850
 851	cmd->allowed = SD_MAX_RETRIES;
 852	cmd->transfersize = data_len;
 853	rq->timeout = SD_TIMEOUT;
 854
 855	return scsi_init_io(cmd);
 856}
 
 
 857
 858static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
 859		bool unmap)
 860{
 861	struct scsi_device *sdp = cmd->device;
 862	struct request *rq = cmd->request;
 863	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 864	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 865	u32 data_len = sdp->sector_size;
 866
 867	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 868	if (!rq->special_vec.bv_page)
 869		return BLK_STS_RESOURCE;
 870	clear_highpage(rq->special_vec.bv_page);
 871	rq->special_vec.bv_offset = 0;
 872	rq->special_vec.bv_len = data_len;
 873	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 874
 875	cmd->cmd_len = 16;
 876	cmd->cmnd[0] = WRITE_SAME_16;
 877	if (unmap)
 878		cmd->cmnd[1] = 0x8; /* UNMAP */
 879	put_unaligned_be64(lba, &cmd->cmnd[2]);
 880	put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 
 
 
 881
 882	cmd->allowed = SD_MAX_RETRIES;
 883	cmd->transfersize = data_len;
 884	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 
 
 
 
 
 885
 886	return scsi_init_io(cmd);
 887}
 888
 889static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
 890		bool unmap)
 891{
 892	struct scsi_device *sdp = cmd->device;
 893	struct request *rq = cmd->request;
 894	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 895	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 896	u32 data_len = sdp->sector_size;
 897
 898	rq->special_vec.bv_page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
 899	if (!rq->special_vec.bv_page)
 900		return BLK_STS_RESOURCE;
 901	clear_highpage(rq->special_vec.bv_page);
 902	rq->special_vec.bv_offset = 0;
 903	rq->special_vec.bv_len = data_len;
 904	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
 905
 906	cmd->cmd_len = 10;
 907	cmd->cmnd[0] = WRITE_SAME;
 908	if (unmap)
 909		cmd->cmnd[1] = 0x8; /* UNMAP */
 910	put_unaligned_be32(lba, &cmd->cmnd[2]);
 911	put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
 912
 
 913	cmd->allowed = SD_MAX_RETRIES;
 914	cmd->transfersize = data_len;
 915	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
 916
 917	return scsi_init_io(cmd);
 918}
 
 919
 920static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
 921{
 922	struct request *rq = cmd->request;
 923	struct scsi_device *sdp = cmd->device;
 924	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 925	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
 926	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
 927
 928	if (!(rq->cmd_flags & REQ_NOUNMAP)) {
 929		switch (sdkp->zeroing_mode) {
 930		case SD_ZERO_WS16_UNMAP:
 931			return sd_setup_write_same16_cmnd(cmd, true);
 932		case SD_ZERO_WS10_UNMAP:
 933			return sd_setup_write_same10_cmnd(cmd, true);
 934		}
 935	}
 936
 937	if (sdp->no_write_same)
 938		return BLK_STS_TARGET;
 939
 940	if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
 941		return sd_setup_write_same16_cmnd(cmd, false);
 942
 943	return sd_setup_write_same10_cmnd(cmd, false);
 944}
 945
 946static void sd_config_write_same(struct scsi_disk *sdkp)
 947{
 948	struct request_queue *q = sdkp->disk->queue;
 949	unsigned int logical_block_size = sdkp->device->sector_size;
 950
 951	if (sdkp->device->no_write_same) {
 952		sdkp->max_ws_blocks = 0;
 953		goto out;
 954	}
 955
 956	/* Some devices can not handle block counts above 0xffff despite
 957	 * supporting WRITE SAME(16). Consequently we default to 64k
 958	 * blocks per I/O unless the device explicitly advertises a
 959	 * bigger limit.
 960	 */
 961	if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
 962		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 963						   (u32)SD_MAX_WS16_BLOCKS);
 964	else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
 965		sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
 966						   (u32)SD_MAX_WS10_BLOCKS);
 967	else {
 968		sdkp->device->no_write_same = 1;
 969		sdkp->max_ws_blocks = 0;
 970	}
 971
 972	if (sdkp->lbprz && sdkp->lbpws)
 973		sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
 974	else if (sdkp->lbprz && sdkp->lbpws10)
 975		sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
 976	else if (sdkp->max_ws_blocks)
 977		sdkp->zeroing_mode = SD_ZERO_WS;
 978	else
 979		sdkp->zeroing_mode = SD_ZERO_WRITE;
 980
 981	if (sdkp->max_ws_blocks &&
 982	    sdkp->physical_block_size > logical_block_size) {
 983		/*
 984		 * Reporting a maximum number of blocks that is not aligned
 985		 * on the device physical size would cause a large write same
 986		 * request to be split into physically unaligned chunks by
 987		 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
 988		 * even if the caller of these functions took care to align the
 989		 * large request. So make sure the maximum reported is aligned
 990		 * to the device physical block size. This is only an optional
 991		 * optimization for regular disks, but this is mandatory to
 992		 * avoid failure of large write same requests directed at
 993		 * sequential write required zones of host-managed ZBC disks.
 994		 */
 995		sdkp->max_ws_blocks =
 996			round_down(sdkp->max_ws_blocks,
 997				   bytes_to_logical(sdkp->device,
 998						    sdkp->physical_block_size));
 999	}
1000
1001out:
1002	blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
1003					 (logical_block_size >> 9));
1004	blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
1005					 (logical_block_size >> 9));
1006}
1007
1008/**
1009 * sd_setup_write_same_cmnd - write the same data to multiple blocks
1010 * @cmd: command to prepare
1011 *
1012 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
1013 * the preference indicated by the target device.
1014 **/
1015static blk_status_t sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
1016{
1017	struct request *rq = cmd->request;
1018	struct scsi_device *sdp = cmd->device;
1019	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1020	struct bio *bio = rq->bio;
1021	u64 lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1022	u32 nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1023	blk_status_t ret;
 
1024
1025	if (sdkp->device->no_write_same)
1026		return BLK_STS_TARGET;
1027
1028	BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
1029
 
 
 
 
 
 
 
 
 
1030	rq->timeout = SD_WRITE_SAME_TIMEOUT;
1031
1032	if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff) {
1033		cmd->cmd_len = 16;
1034		cmd->cmnd[0] = WRITE_SAME_16;
1035		put_unaligned_be64(lba, &cmd->cmnd[2]);
1036		put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
1037	} else {
1038		cmd->cmd_len = 10;
1039		cmd->cmnd[0] = WRITE_SAME;
1040		put_unaligned_be32(lba, &cmd->cmnd[2]);
1041		put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1042	}
1043
1044	cmd->transfersize = sdp->sector_size;
1045	cmd->allowed = SD_MAX_RETRIES;
1046
1047	/*
1048	 * For WRITE SAME the data transferred via the DATA OUT buffer is
1049	 * different from the amount of data actually written to the target.
1050	 *
1051	 * We set up __data_len to the amount of data transferred via the
1052	 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
1053	 * to transfer a single sector of data first, but then reset it to
1054	 * the amount of data to be written right after so that the I/O path
1055	 * knows how much to actually write.
1056	 */
1057	rq->__data_len = sdp->sector_size;
1058	ret = scsi_init_io(cmd);
1059	rq->__data_len = blk_rq_bytes(rq);
1060
1061	return ret;
1062}
1063
1064static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1065{
1066	struct request *rq = cmd->request;
1067
1068	/* flush requests don't perform I/O, zero the S/G table */
1069	memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1070
1071	cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1072	cmd->cmd_len = 10;
1073	cmd->transfersize = 0;
1074	cmd->allowed = SD_MAX_RETRIES;
1075
1076	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1077	return BLK_STS_OK;
1078}
1079
1080static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1081				       sector_t lba, unsigned int nr_blocks,
1082				       unsigned char flags)
1083{
1084	cmd->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1085	if (unlikely(cmd->cmnd == NULL))
1086		return BLK_STS_RESOURCE;
 
 
 
 
 
 
 
 
1087
1088	cmd->cmd_len = SD_EXT_CDB_SIZE;
1089	memset(cmd->cmnd, 0, cmd->cmd_len);
 
 
 
1090
1091	cmd->cmnd[0]  = VARIABLE_LENGTH_CMD;
1092	cmd->cmnd[7]  = 0x18; /* Additional CDB len */
1093	cmd->cmnd[9]  = write ? WRITE_32 : READ_32;
1094	cmd->cmnd[10] = flags;
1095	put_unaligned_be64(lba, &cmd->cmnd[12]);
1096	put_unaligned_be32(lba, &cmd->cmnd[20]); /* Expected Indirect LBA */
1097	put_unaligned_be32(nr_blocks, &cmd->cmnd[28]);
1098
1099	return BLK_STS_OK;
1100}
 
1101
1102static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1103				       sector_t lba, unsigned int nr_blocks,
1104				       unsigned char flags)
1105{
1106	cmd->cmd_len  = 16;
1107	cmd->cmnd[0]  = write ? WRITE_16 : READ_16;
1108	cmd->cmnd[1]  = flags;
1109	cmd->cmnd[14] = 0;
1110	cmd->cmnd[15] = 0;
1111	put_unaligned_be64(lba, &cmd->cmnd[2]);
1112	put_unaligned_be32(nr_blocks, &cmd->cmnd[10]);
 
 
 
1113
1114	return BLK_STS_OK;
1115}
1116
1117static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1118				       sector_t lba, unsigned int nr_blocks,
1119				       unsigned char flags)
1120{
1121	cmd->cmd_len = 10;
1122	cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1123	cmd->cmnd[1] = flags;
1124	cmd->cmnd[6] = 0;
1125	cmd->cmnd[9] = 0;
1126	put_unaligned_be32(lba, &cmd->cmnd[2]);
1127	put_unaligned_be16(nr_blocks, &cmd->cmnd[7]);
1128
1129	return BLK_STS_OK;
1130}
1131
1132static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1133				      sector_t lba, unsigned int nr_blocks,
1134				      unsigned char flags)
1135{
1136	/* Avoid that 0 blocks gets translated into 256 blocks. */
1137	if (WARN_ON_ONCE(nr_blocks == 0))
1138		return BLK_STS_IOERR;
1139
1140	if (unlikely(flags & 0x8)) {
1141		/*
1142		 * This happens only if this drive failed 10byte rw
1143		 * command with ILLEGAL_REQUEST during operation and
1144		 * thus turned off use_10_for_rw.
1145		 */
1146		scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1147		return BLK_STS_IOERR;
1148	}
1149
1150	cmd->cmd_len = 6;
1151	cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1152	cmd->cmnd[1] = (lba >> 16) & 0x1f;
1153	cmd->cmnd[2] = (lba >> 8) & 0xff;
1154	cmd->cmnd[3] = lba & 0xff;
1155	cmd->cmnd[4] = nr_blocks;
1156	cmd->cmnd[5] = 0;
1157
1158	return BLK_STS_OK;
1159}
 
 
 
 
 
 
 
1160
1161static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1162{
1163	struct request *rq = cmd->request;
1164	struct scsi_device *sdp = cmd->device;
1165	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
1166	sector_t lba = sectors_to_logical(sdp, blk_rq_pos(rq));
1167	sector_t threshold;
1168	unsigned int nr_blocks = sectors_to_logical(sdp, blk_rq_sectors(rq));
1169	unsigned int mask = logical_to_sectors(sdp, 1) - 1;
1170	bool write = rq_data_dir(rq) == WRITE;
1171	unsigned char protect, fua;
1172	blk_status_t ret;
1173	unsigned int dif;
1174	bool dix;
1175
1176	ret = scsi_init_io(cmd);
1177	if (ret != BLK_STS_OK)
1178		return ret;
1179
1180	if (!scsi_device_online(sdp) || sdp->changed) {
1181		scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1182		return BLK_STS_IOERR;
 
 
 
 
 
 
 
 
 
 
 
 
 
1183	}
1184
1185	if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(rq->rq_disk)) {
1186		scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1187		return BLK_STS_IOERR;
 
 
 
 
 
1188	}
1189
1190	if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1191		scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1192		return BLK_STS_IOERR;
 
 
 
 
 
1193	}
 
 
1194
1195	/*
1196	 * Some SD card readers can't handle accesses which touch the
1197	 * last one or two logical blocks. Split accesses as needed.
1198	 */
1199	threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1200
1201	if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1202		if (lba < threshold) {
1203			/* Access up to the threshold but not beyond */
1204			nr_blocks = threshold - lba;
1205		} else {
1206			/* Access only a single logical block */
1207			nr_blocks = 1;
1208		}
1209	}
1210
1211	fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1212	dix = scsi_prot_sg_count(cmd);
1213	dif = scsi_host_dif_capable(cmd->device->host, sdkp->protection_type);
 
 
 
 
 
1214
1215	if (dif || dix)
1216		protect = sd_setup_protect_cmnd(cmd, dix, dif);
1217	else
1218		protect = 0;
1219
1220	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1221		ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1222					 protect | fua);
1223	} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1224		ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1225					 protect | fua);
1226	} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1227		   sdp->use_10_for_rw || protect) {
1228		ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1229					 protect | fua);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1230	} else {
1231		ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1232					protect | fua);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1233	}
1234
1235	if (unlikely(ret != BLK_STS_OK))
1236		return ret;
1237
1238	/*
1239	 * We shouldn't disconnect in the middle of a sector, so with a dumb
1240	 * host adapter, it's safe to assume that we can at least transfer
1241	 * this many bytes between each connect / disconnect.
1242	 */
1243	cmd->transfersize = sdp->sector_size;
1244	cmd->underflow = nr_blocks << 9;
1245	cmd->allowed = SD_MAX_RETRIES;
1246	cmd->sdb.length = nr_blocks * sdp->sector_size;
1247
1248	SCSI_LOG_HLQUEUE(1,
1249			 scmd_printk(KERN_INFO, cmd,
1250				     "%s: block=%llu, count=%d\n", __func__,
1251				     (unsigned long long)blk_rq_pos(rq),
1252				     blk_rq_sectors(rq)));
1253	SCSI_LOG_HLQUEUE(2,
1254			 scmd_printk(KERN_INFO, cmd,
1255				     "%s %d/%u 512 byte blocks.\n",
1256				     write ? "writing" : "reading", nr_blocks,
1257				     blk_rq_sectors(rq)));
1258
1259	/*
1260	 * This indicates that the command is ready from our end to be
1261	 * queued.
1262	 */
1263	return BLK_STS_OK;
 
 
 
 
 
1264}
1265
1266static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1267{
1268	struct request *rq = cmd->request;
1269
1270	switch (req_op(rq)) {
1271	case REQ_OP_DISCARD:
1272		switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1273		case SD_LBP_UNMAP:
1274			return sd_setup_unmap_cmnd(cmd);
1275		case SD_LBP_WS16:
1276			return sd_setup_write_same16_cmnd(cmd, true);
1277		case SD_LBP_WS10:
1278			return sd_setup_write_same10_cmnd(cmd, true);
1279		case SD_LBP_ZERO:
1280			return sd_setup_write_same10_cmnd(cmd, false);
1281		default:
1282			return BLK_STS_TARGET;
1283		}
1284	case REQ_OP_WRITE_ZEROES:
1285		return sd_setup_write_zeroes_cmnd(cmd);
1286	case REQ_OP_WRITE_SAME:
1287		return sd_setup_write_same_cmnd(cmd);
1288	case REQ_OP_FLUSH:
1289		return sd_setup_flush_cmnd(cmd);
1290	case REQ_OP_READ:
1291	case REQ_OP_WRITE:
1292		return sd_setup_read_write_cmnd(cmd);
 
 
1293	case REQ_OP_ZONE_RESET:
1294		return sd_zbc_setup_reset_cmnd(cmd, false);
1295	case REQ_OP_ZONE_RESET_ALL:
1296		return sd_zbc_setup_reset_cmnd(cmd, true);
1297	default:
1298		WARN_ON_ONCE(1);
1299		return BLK_STS_NOTSUPP;
1300	}
1301}
1302
1303static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1304{
1305	struct request *rq = SCpnt->request;
1306	u8 *cmnd;
1307
1308	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1309		mempool_free(rq->special_vec.bv_page, sd_page_pool);
1310
1311	if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1312		cmnd = SCpnt->cmnd;
1313		SCpnt->cmnd = NULL;
1314		SCpnt->cmd_len = 0;
1315		mempool_free(cmnd, sd_cdb_pool);
1316	}
1317}
1318
1319/**
1320 *	sd_open - open a scsi disk device
1321 *	@bdev: Block device of the scsi disk to open
1322 *	@mode: FMODE_* mask
1323 *
1324 *	Returns 0 if successful. Returns a negated errno value in case 
1325 *	of error.
1326 *
1327 *	Note: This can be called from a user context (e.g. fsck(1) )
1328 *	or from within the kernel (e.g. as a result of a mount(1) ).
1329 *	In the latter case @inode and @filp carry an abridged amount
1330 *	of information as noted above.
1331 *
1332 *	Locking: called with bdev->bd_mutex held.
1333 **/
1334static int sd_open(struct block_device *bdev, fmode_t mode)
1335{
1336	struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1337	struct scsi_device *sdev;
1338	int retval;
1339
1340	if (!sdkp)
1341		return -ENXIO;
1342
1343	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1344
1345	sdev = sdkp->device;
1346
1347	/*
1348	 * If the device is in error recovery, wait until it is done.
1349	 * If the device is offline, then disallow any access to it.
1350	 */
1351	retval = -ENXIO;
1352	if (!scsi_block_when_processing_errors(sdev))
1353		goto error_out;
1354
1355	if (sdev->removable || sdkp->write_prot)
1356		check_disk_change(bdev);
1357
1358	/*
1359	 * If the drive is empty, just let the open fail.
1360	 */
1361	retval = -ENOMEDIUM;
1362	if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1363		goto error_out;
1364
1365	/*
1366	 * If the device has the write protect tab set, have the open fail
1367	 * if the user expects to be able to write to the thing.
1368	 */
1369	retval = -EROFS;
1370	if (sdkp->write_prot && (mode & FMODE_WRITE))
1371		goto error_out;
1372
1373	/*
1374	 * It is possible that the disk changing stuff resulted in
1375	 * the device being taken offline.  If this is the case,
1376	 * report this to the user, and don't pretend that the
1377	 * open actually succeeded.
1378	 */
1379	retval = -ENXIO;
1380	if (!scsi_device_online(sdev))
1381		goto error_out;
1382
1383	if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1384		if (scsi_block_when_processing_errors(sdev))
1385			scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1386	}
1387
1388	return 0;
1389
1390error_out:
1391	scsi_disk_put(sdkp);
1392	return retval;	
1393}
1394
1395/**
1396 *	sd_release - invoked when the (last) close(2) is called on this
1397 *	scsi disk.
1398 *	@disk: disk to release
1399 *	@mode: FMODE_* mask
1400 *
1401 *	Returns 0. 
1402 *
1403 *	Note: may block (uninterruptible) if error recovery is underway
1404 *	on this disk.
1405 *
1406 *	Locking: called with bdev->bd_mutex held.
1407 **/
1408static void sd_release(struct gendisk *disk, fmode_t mode)
1409{
1410	struct scsi_disk *sdkp = scsi_disk(disk);
1411	struct scsi_device *sdev = sdkp->device;
1412
1413	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1414
1415	if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1416		if (scsi_block_when_processing_errors(sdev))
1417			scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1418	}
1419
 
 
 
 
 
1420	scsi_disk_put(sdkp);
1421}
1422
1423static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1424{
1425	struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1426	struct scsi_device *sdp = sdkp->device;
1427	struct Scsi_Host *host = sdp->host;
1428	sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1429	int diskinfo[4];
1430
1431	/* default to most commonly used values */
1432	diskinfo[0] = 0x40;	/* 1 << 6 */
1433	diskinfo[1] = 0x20;	/* 1 << 5 */
1434	diskinfo[2] = capacity >> 11;
1435
1436	/* override with calculated, extended default, or driver values */
1437	if (host->hostt->bios_param)
1438		host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1439	else
1440		scsicam_bios_param(bdev, capacity, diskinfo);
1441
1442	geo->heads = diskinfo[0];
1443	geo->sectors = diskinfo[1];
1444	geo->cylinders = diskinfo[2];
1445	return 0;
1446}
1447
1448/**
1449 *	sd_ioctl - process an ioctl
1450 *	@bdev: target block device
1451 *	@mode: FMODE_* mask
1452 *	@cmd: ioctl command number
1453 *	@arg: this is third argument given to ioctl(2) system call.
1454 *	Often contains a pointer.
1455 *
1456 *	Returns 0 if successful (some ioctls return positive numbers on
1457 *	success as well). Returns a negated errno value in case of error.
1458 *
1459 *	Note: most ioctls are forward onto the block subsystem or further
1460 *	down in the scsi subsystem.
1461 **/
1462static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1463		    unsigned int cmd, unsigned long arg)
1464{
1465	struct gendisk *disk = bdev->bd_disk;
1466	struct scsi_disk *sdkp = scsi_disk(disk);
1467	struct scsi_device *sdp = sdkp->device;
1468	void __user *p = (void __user *)arg;
1469	int error;
1470    
1471	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1472				    "cmd=0x%x\n", disk->disk_name, cmd));
1473
1474	error = scsi_verify_blk_ioctl(bdev, cmd);
1475	if (error < 0)
1476		return error;
1477
1478	/*
1479	 * If we are in the middle of error recovery, don't let anyone
1480	 * else try and use this device.  Also, if error recovery fails, it
1481	 * may try and take the device offline, in which case all further
1482	 * access to the device is prohibited.
1483	 */
1484	error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1485			(mode & FMODE_NDELAY) != 0);
1486	if (error)
1487		goto out;
1488
1489	if (is_sed_ioctl(cmd))
1490		return sed_ioctl(sdkp->opal_dev, cmd, p);
1491
1492	/*
1493	 * Send SCSI addressing ioctls directly to mid level, send other
1494	 * ioctls to block level and then onto mid level if they can't be
1495	 * resolved.
1496	 */
1497	switch (cmd) {
1498		case SCSI_IOCTL_GET_IDLUN:
1499		case SCSI_IOCTL_GET_BUS_NUMBER:
1500			error = scsi_ioctl(sdp, cmd, p);
1501			break;
1502		default:
1503			error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1504			if (error != -ENOTTY)
1505				break;
1506			error = scsi_ioctl(sdp, cmd, p);
1507			break;
1508	}
1509out:
1510	return error;
1511}
1512
1513static void set_media_not_present(struct scsi_disk *sdkp)
1514{
1515	if (sdkp->media_present)
1516		sdkp->device->changed = 1;
1517
1518	if (sdkp->device->removable) {
1519		sdkp->media_present = 0;
1520		sdkp->capacity = 0;
1521	}
1522}
1523
1524static int media_not_present(struct scsi_disk *sdkp,
1525			     struct scsi_sense_hdr *sshdr)
1526{
1527	if (!scsi_sense_valid(sshdr))
1528		return 0;
1529
1530	/* not invoked for commands that could return deferred errors */
1531	switch (sshdr->sense_key) {
1532	case UNIT_ATTENTION:
1533	case NOT_READY:
1534		/* medium not present */
1535		if (sshdr->asc == 0x3A) {
1536			set_media_not_present(sdkp);
1537			return 1;
1538		}
1539	}
1540	return 0;
1541}
1542
1543/**
1544 *	sd_check_events - check media events
1545 *	@disk: kernel device descriptor
1546 *	@clearing: disk events currently being cleared
1547 *
1548 *	Returns mask of DISK_EVENT_*.
1549 *
1550 *	Note: this function is invoked from the block subsystem.
1551 **/
1552static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1553{
1554	struct scsi_disk *sdkp = scsi_disk_get(disk);
1555	struct scsi_device *sdp;
 
1556	int retval;
1557
1558	if (!sdkp)
1559		return 0;
1560
1561	sdp = sdkp->device;
1562	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1563
1564	/*
1565	 * If the device is offline, don't send any commands - just pretend as
1566	 * if the command failed.  If the device ever comes back online, we
1567	 * can deal with it then.  It is only because of unrecoverable errors
1568	 * that we would ever take a device offline in the first place.
1569	 */
1570	if (!scsi_device_online(sdp)) {
1571		set_media_not_present(sdkp);
1572		goto out;
1573	}
1574
1575	/*
1576	 * Using TEST_UNIT_READY enables differentiation between drive with
1577	 * no cartridge loaded - NOT READY, drive with changed cartridge -
1578	 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1579	 *
1580	 * Drives that auto spin down. eg iomega jaz 1G, will be started
1581	 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1582	 * sd_revalidate() is called.
1583	 */
 
 
1584	if (scsi_block_when_processing_errors(sdp)) {
1585		struct scsi_sense_hdr sshdr = { 0, };
1586
1587		retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1588					      &sshdr);
 
1589
1590		/* failed to execute TUR, assume media not present */
1591		if (host_byte(retval)) {
1592			set_media_not_present(sdkp);
1593			goto out;
1594		}
1595
1596		if (media_not_present(sdkp, &sshdr))
1597			goto out;
1598	}
1599
1600	/*
1601	 * For removable scsi disk we have to recognise the presence
1602	 * of a disk in the drive.
1603	 */
1604	if (!sdkp->media_present)
1605		sdp->changed = 1;
1606	sdkp->media_present = 1;
1607out:
1608	/*
1609	 * sdp->changed is set under the following conditions:
1610	 *
1611	 *	Medium present state has changed in either direction.
1612	 *	Device has indicated UNIT_ATTENTION.
1613	 */
 
1614	retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1615	sdp->changed = 0;
1616	scsi_disk_put(sdkp);
1617	return retval;
1618}
1619
1620static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1621{
1622	int retries, res;
1623	struct scsi_device *sdp = sdkp->device;
1624	const int timeout = sdp->request_queue->rq_timeout
1625		* SD_FLUSH_TIMEOUT_MULTIPLIER;
1626	struct scsi_sense_hdr my_sshdr;
1627
1628	if (!scsi_device_online(sdp))
1629		return -ENODEV;
1630
1631	/* caller might not be interested in sense, but we need it */
1632	if (!sshdr)
1633		sshdr = &my_sshdr;
1634
1635	for (retries = 3; retries > 0; --retries) {
1636		unsigned char cmd[10] = { 0 };
1637
1638		cmd[0] = SYNCHRONIZE_CACHE;
1639		/*
1640		 * Leave the rest of the command zero to indicate
1641		 * flush everything.
1642		 */
1643		res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1644				timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
 
1645		if (res == 0)
1646			break;
1647	}
1648
1649	if (res) {
1650		sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1651
1652		if (driver_byte(res) == DRIVER_SENSE)
1653			sd_print_sense_hdr(sdkp, sshdr);
1654
1655		/* we need to evaluate the error return  */
1656		if (scsi_sense_valid(sshdr) &&
1657			(sshdr->asc == 0x3a ||	/* medium not present */
1658			 sshdr->asc == 0x20 ||	/* invalid command */
1659			 (sshdr->asc == 0x74 && sshdr->ascq == 0x71)))	/* drive is password locked */
1660				/* this is no error here */
1661				return 0;
1662
1663		switch (host_byte(res)) {
1664		/* ignore errors due to racing a disconnection */
1665		case DID_BAD_TARGET:
1666		case DID_NO_CONNECT:
1667			return 0;
1668		/* signal the upper layer it might try again */
1669		case DID_BUS_BUSY:
1670		case DID_IMM_RETRY:
1671		case DID_REQUEUE:
1672		case DID_SOFT_ERROR:
1673			return -EBUSY;
1674		default:
1675			return -EIO;
1676		}
1677	}
1678	return 0;
1679}
1680
1681static void sd_rescan(struct device *dev)
1682{
1683	struct scsi_disk *sdkp = dev_get_drvdata(dev);
1684
1685	revalidate_disk(sdkp->disk);
1686}
1687
1688
1689#ifdef CONFIG_COMPAT
1690/* 
1691 * This gets directly called from VFS. When the ioctl 
1692 * is not recognized we go back to the other translation paths. 
1693 */
1694static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1695			   unsigned int cmd, unsigned long arg)
1696{
1697	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1698	int error;
1699
1700	error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1701			(mode & FMODE_NDELAY) != 0);
1702	if (error)
1703		return error;
1704	       
1705	/* 
1706	 * Let the static ioctl translation table take care of it.
1707	 */
1708	if (!sdev->host->hostt->compat_ioctl)
1709		return -ENOIOCTLCMD; 
1710	return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1711}
1712#endif
1713
1714static char sd_pr_type(enum pr_type type)
1715{
1716	switch (type) {
1717	case PR_WRITE_EXCLUSIVE:
1718		return 0x01;
1719	case PR_EXCLUSIVE_ACCESS:
1720		return 0x03;
1721	case PR_WRITE_EXCLUSIVE_REG_ONLY:
1722		return 0x05;
1723	case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1724		return 0x06;
1725	case PR_WRITE_EXCLUSIVE_ALL_REGS:
1726		return 0x07;
1727	case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1728		return 0x08;
1729	default:
1730		return 0;
1731	}
1732};
1733
1734static int sd_pr_command(struct block_device *bdev, u8 sa,
1735		u64 key, u64 sa_key, u8 type, u8 flags)
1736{
1737	struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1738	struct scsi_sense_hdr sshdr;
1739	int result;
1740	u8 cmd[16] = { 0, };
1741	u8 data[24] = { 0, };
1742
1743	cmd[0] = PERSISTENT_RESERVE_OUT;
1744	cmd[1] = sa;
1745	cmd[2] = type;
1746	put_unaligned_be32(sizeof(data), &cmd[5]);
1747
1748	put_unaligned_be64(key, &data[0]);
1749	put_unaligned_be64(sa_key, &data[8]);
1750	data[20] = flags;
1751
1752	result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1753			&sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1754
1755	if (driver_byte(result) == DRIVER_SENSE &&
1756	    scsi_sense_valid(&sshdr)) {
1757		sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1758		scsi_print_sense_hdr(sdev, NULL, &sshdr);
1759	}
1760
1761	return result;
1762}
1763
1764static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1765		u32 flags)
1766{
1767	if (flags & ~PR_FL_IGNORE_KEY)
1768		return -EOPNOTSUPP;
1769	return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1770			old_key, new_key, 0,
1771			(1 << 0) /* APTPL */);
1772}
1773
1774static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1775		u32 flags)
1776{
1777	if (flags)
1778		return -EOPNOTSUPP;
1779	return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1780}
1781
1782static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1783{
1784	return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1785}
1786
1787static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1788		enum pr_type type, bool abort)
1789{
1790	return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1791			     sd_pr_type(type), 0);
1792}
1793
1794static int sd_pr_clear(struct block_device *bdev, u64 key)
1795{
1796	return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1797}
1798
1799static const struct pr_ops sd_pr_ops = {
1800	.pr_register	= sd_pr_register,
1801	.pr_reserve	= sd_pr_reserve,
1802	.pr_release	= sd_pr_release,
1803	.pr_preempt	= sd_pr_preempt,
1804	.pr_clear	= sd_pr_clear,
1805};
1806
1807static const struct block_device_operations sd_fops = {
1808	.owner			= THIS_MODULE,
1809	.open			= sd_open,
1810	.release		= sd_release,
1811	.ioctl			= sd_ioctl,
1812	.getgeo			= sd_getgeo,
1813#ifdef CONFIG_COMPAT
1814	.compat_ioctl		= sd_compat_ioctl,
1815#endif
1816	.check_events		= sd_check_events,
1817	.revalidate_disk	= sd_revalidate_disk,
1818	.unlock_native_capacity	= sd_unlock_native_capacity,
1819	.report_zones		= sd_zbc_report_zones,
1820	.pr_ops			= &sd_pr_ops,
1821};
1822
1823/**
1824 *	sd_eh_reset - reset error handling callback
1825 *	@scmd:		sd-issued command that has failed
1826 *
1827 *	This function is called by the SCSI midlayer before starting
1828 *	SCSI EH. When counting medium access failures we have to be
1829 *	careful to register it only only once per device and SCSI EH run;
1830 *	there might be several timed out commands which will cause the
1831 *	'max_medium_access_timeouts' counter to trigger after the first
1832 *	SCSI EH run already and set the device to offline.
1833 *	So this function resets the internal counter before starting SCSI EH.
1834 **/
1835static void sd_eh_reset(struct scsi_cmnd *scmd)
1836{
1837	struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1838
1839	/* New SCSI EH run, reset gate variable */
1840	sdkp->ignore_medium_access_errors = false;
1841}
1842
1843/**
1844 *	sd_eh_action - error handling callback
1845 *	@scmd:		sd-issued command that has failed
1846 *	@eh_disp:	The recovery disposition suggested by the midlayer
1847 *
1848 *	This function is called by the SCSI midlayer upon completion of an
1849 *	error test command (currently TEST UNIT READY). The result of sending
1850 *	the eh command is passed in eh_disp.  We're looking for devices that
1851 *	fail medium access commands but are OK with non access commands like
1852 *	test unit ready (so wrongly see the device as having a successful
1853 *	recovery)
1854 **/
1855static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1856{
1857	struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1858	struct scsi_device *sdev = scmd->device;
1859
1860	if (!scsi_device_online(sdev) ||
1861	    !scsi_medium_access_command(scmd) ||
1862	    host_byte(scmd->result) != DID_TIME_OUT ||
1863	    eh_disp != SUCCESS)
1864		return eh_disp;
1865
1866	/*
1867	 * The device has timed out executing a medium access command.
1868	 * However, the TEST UNIT READY command sent during error
1869	 * handling completed successfully. Either the device is in the
1870	 * process of recovering or has it suffered an internal failure
1871	 * that prevents access to the storage medium.
1872	 */
1873	if (!sdkp->ignore_medium_access_errors) {
1874		sdkp->medium_access_timed_out++;
1875		sdkp->ignore_medium_access_errors = true;
1876	}
1877
1878	/*
1879	 * If the device keeps failing read/write commands but TEST UNIT
1880	 * READY always completes successfully we assume that medium
1881	 * access is no longer possible and take the device offline.
1882	 */
1883	if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1884		scmd_printk(KERN_ERR, scmd,
1885			    "Medium access timeout failure. Offlining disk!\n");
1886		mutex_lock(&sdev->state_mutex);
1887		scsi_device_set_state(sdev, SDEV_OFFLINE);
1888		mutex_unlock(&sdev->state_mutex);
1889
1890		return SUCCESS;
1891	}
1892
1893	return eh_disp;
1894}
1895
1896static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1897{
1898	struct request *req = scmd->request;
1899	struct scsi_device *sdev = scmd->device;
1900	unsigned int transferred, good_bytes;
1901	u64 start_lba, end_lba, bad_lba;
1902
1903	/*
1904	 * Some commands have a payload smaller than the device logical
1905	 * block size (e.g. INQUIRY on a 4K disk).
1906	 */
1907	if (scsi_bufflen(scmd) <= sdev->sector_size)
 
 
 
 
 
 
 
 
 
1908		return 0;
1909
1910	/* Check if we have a 'bad_lba' information */
1911	if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1912				     SCSI_SENSE_BUFFERSIZE,
1913				     &bad_lba))
1914		return 0;
1915
1916	/*
1917	 * If the bad lba was reported incorrectly, we have no idea where
 
 
 
1918	 * the error is.
1919	 */
1920	start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1921	end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1922	if (bad_lba < start_lba || bad_lba >= end_lba)
1923		return 0;
1924
1925	/*
1926	 * resid is optional but mostly filled in.  When it's unused,
1927	 * its value is zero, so we assume the whole buffer transferred
1928	 */
1929	transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1930
1931	/* This computation should always be done in terms of the
1932	 * resolution of the device's medium.
1933	 */
1934	good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1935
1936	return min(good_bytes, transferred);
1937}
1938
1939/**
1940 *	sd_done - bottom half handler: called when the lower level
1941 *	driver has completed (successfully or otherwise) a scsi command.
1942 *	@SCpnt: mid-level's per command structure.
1943 *
1944 *	Note: potentially run from within an ISR. Must not block.
1945 **/
1946static int sd_done(struct scsi_cmnd *SCpnt)
1947{
1948	int result = SCpnt->result;
1949	unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1950	unsigned int sector_size = SCpnt->device->sector_size;
1951	unsigned int resid;
1952	struct scsi_sense_hdr sshdr;
1953	struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1954	struct request *req = SCpnt->request;
1955	int sense_valid = 0;
1956	int sense_deferred = 0;
 
 
1957
1958	switch (req_op(req)) {
1959	case REQ_OP_DISCARD:
1960	case REQ_OP_WRITE_ZEROES:
1961	case REQ_OP_WRITE_SAME:
1962	case REQ_OP_ZONE_RESET:
1963	case REQ_OP_ZONE_RESET_ALL:
1964		if (!result) {
1965			good_bytes = blk_rq_bytes(req);
1966			scsi_set_resid(SCpnt, 0);
1967		} else {
1968			good_bytes = 0;
1969			scsi_set_resid(SCpnt, blk_rq_bytes(req));
1970		}
1971		break;
 
 
 
 
 
 
 
 
 
 
1972	default:
1973		/*
1974		 * In case of bogus fw or device, we could end up having
1975		 * an unaligned partial completion. Check this here and force
1976		 * alignment.
1977		 */
1978		resid = scsi_get_resid(SCpnt);
1979		if (resid & (sector_size - 1)) {
1980			sd_printk(KERN_INFO, sdkp,
1981				"Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1982				resid, sector_size);
1983			scsi_print_command(SCpnt);
1984			resid = min(scsi_bufflen(SCpnt),
1985				    round_up(resid, sector_size));
1986			scsi_set_resid(SCpnt, resid);
1987		}
1988	}
1989
1990	if (result) {
1991		sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1992		if (sense_valid)
1993			sense_deferred = scsi_sense_is_deferred(&sshdr);
1994	}
1995	sdkp->medium_access_timed_out = 0;
1996
1997	if (driver_byte(result) != DRIVER_SENSE &&
1998	    (!sense_valid || sense_deferred))
1999		goto out;
2000
2001	switch (sshdr.sense_key) {
2002	case HARDWARE_ERROR:
2003	case MEDIUM_ERROR:
2004		good_bytes = sd_completed_bytes(SCpnt);
2005		break;
2006	case RECOVERED_ERROR:
2007		good_bytes = scsi_bufflen(SCpnt);
2008		break;
2009	case NO_SENSE:
2010		/* This indicates a false check condition, so ignore it.  An
2011		 * unknown amount of data was transferred so treat it as an
2012		 * error.
2013		 */
2014		SCpnt->result = 0;
2015		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2016		break;
2017	case ABORTED_COMMAND:
2018		if (sshdr.asc == 0x10)  /* DIF: Target detected corruption */
2019			good_bytes = sd_completed_bytes(SCpnt);
2020		break;
2021	case ILLEGAL_REQUEST:
2022		switch (sshdr.asc) {
2023		case 0x10:	/* DIX: Host detected corruption */
2024			good_bytes = sd_completed_bytes(SCpnt);
2025			break;
2026		case 0x20:	/* INVALID COMMAND OPCODE */
2027		case 0x24:	/* INVALID FIELD IN CDB */
2028			switch (SCpnt->cmnd[0]) {
2029			case UNMAP:
2030				sd_config_discard(sdkp, SD_LBP_DISABLE);
2031				break;
2032			case WRITE_SAME_16:
2033			case WRITE_SAME:
2034				if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2035					sd_config_discard(sdkp, SD_LBP_DISABLE);
2036				} else {
2037					sdkp->device->no_write_same = 1;
2038					sd_config_write_same(sdkp);
 
 
 
2039					req->rq_flags |= RQF_QUIET;
2040				}
2041				break;
2042			}
2043		}
2044		break;
2045	default:
2046		break;
2047	}
2048
2049 out:
2050	if (sd_is_zoned(sdkp))
2051		sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2052
2053	SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2054					   "sd_done: completed %d of %d bytes\n",
2055					   good_bytes, scsi_bufflen(SCpnt)));
2056
 
 
 
2057	return good_bytes;
2058}
2059
2060/*
2061 * spinup disk - called only in sd_revalidate_disk()
2062 */
2063static void
2064sd_spinup_disk(struct scsi_disk *sdkp)
2065{
2066	unsigned char cmd[10];
2067	unsigned long spintime_expire = 0;
2068	int retries, spintime;
2069	unsigned int the_result;
2070	struct scsi_sense_hdr sshdr;
2071	int sense_valid = 0;
2072
2073	spintime = 0;
2074
2075	/* Spin up drives, as required.  Only do this at boot time */
2076	/* Spinup needs to be done for module loads too. */
2077	do {
2078		retries = 0;
2079
2080		do {
2081			cmd[0] = TEST_UNIT_READY;
2082			memset((void *) &cmd[1], 0, 9);
2083
2084			the_result = scsi_execute_req(sdkp->device, cmd,
2085						      DMA_NONE, NULL, 0,
2086						      &sshdr, SD_TIMEOUT,
2087						      SD_MAX_RETRIES, NULL);
2088
2089			/*
2090			 * If the drive has indicated to us that it
2091			 * doesn't have any media in it, don't bother
2092			 * with any more polling.
2093			 */
2094			if (media_not_present(sdkp, &sshdr))
2095				return;
2096
2097			if (the_result)
2098				sense_valid = scsi_sense_valid(&sshdr);
2099			retries++;
2100		} while (retries < 3 && 
2101			 (!scsi_status_is_good(the_result) ||
2102			  ((driver_byte(the_result) == DRIVER_SENSE) &&
2103			  sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2104
2105		if (driver_byte(the_result) != DRIVER_SENSE) {
2106			/* no sense, TUR either succeeded or failed
2107			 * with a status error */
2108			if(!spintime && !scsi_status_is_good(the_result)) {
2109				sd_print_result(sdkp, "Test Unit Ready failed",
2110						the_result);
2111			}
2112			break;
2113		}
2114
2115		/*
2116		 * The device does not want the automatic start to be issued.
2117		 */
2118		if (sdkp->device->no_start_on_add)
2119			break;
2120
2121		if (sense_valid && sshdr.sense_key == NOT_READY) {
2122			if (sshdr.asc == 4 && sshdr.ascq == 3)
2123				break;	/* manual intervention required */
2124			if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2125				break;	/* standby */
2126			if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2127				break;	/* unavailable */
2128			if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2129				break;	/* sanitize in progress */
2130			/*
2131			 * Issue command to spin up drive when not ready
2132			 */
2133			if (!spintime) {
2134				sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2135				cmd[0] = START_STOP;
2136				cmd[1] = 1;	/* Return immediately */
2137				memset((void *) &cmd[2], 0, 8);
2138				cmd[4] = 1;	/* Start spin cycle */
2139				if (sdkp->device->start_stop_pwr_cond)
2140					cmd[4] |= 1 << 4;
2141				scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2142						 NULL, 0, &sshdr,
2143						 SD_TIMEOUT, SD_MAX_RETRIES,
2144						 NULL);
2145				spintime_expire = jiffies + 100 * HZ;
2146				spintime = 1;
2147			}
2148			/* Wait 1 second for next try */
2149			msleep(1000);
2150			printk(KERN_CONT ".");
2151
2152		/*
2153		 * Wait for USB flash devices with slow firmware.
2154		 * Yes, this sense key/ASC combination shouldn't
2155		 * occur here.  It's characteristic of these devices.
2156		 */
2157		} else if (sense_valid &&
2158				sshdr.sense_key == UNIT_ATTENTION &&
2159				sshdr.asc == 0x28) {
2160			if (!spintime) {
2161				spintime_expire = jiffies + 5 * HZ;
2162				spintime = 1;
2163			}
2164			/* Wait 1 second for next try */
2165			msleep(1000);
2166		} else {
2167			/* we don't understand the sense code, so it's
2168			 * probably pointless to loop */
2169			if(!spintime) {
2170				sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2171				sd_print_sense_hdr(sdkp, &sshdr);
2172			}
2173			break;
2174		}
2175				
2176	} while (spintime && time_before_eq(jiffies, spintime_expire));
2177
2178	if (spintime) {
2179		if (scsi_status_is_good(the_result))
2180			printk(KERN_CONT "ready\n");
2181		else
2182			printk(KERN_CONT "not responding...\n");
2183	}
2184}
2185
2186/*
2187 * Determine whether disk supports Data Integrity Field.
2188 */
2189static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2190{
2191	struct scsi_device *sdp = sdkp->device;
2192	u8 type;
2193	int ret = 0;
2194
2195	if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2196		return ret;
2197
2198	type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2199
2200	if (type > T10_PI_TYPE3_PROTECTION)
2201		ret = -ENODEV;
2202	else if (scsi_host_dif_capable(sdp->host, type))
2203		ret = 1;
2204
2205	if (sdkp->first_scan || type != sdkp->protection_type)
2206		switch (ret) {
2207		case -ENODEV:
2208			sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2209				  " protection type %u. Disabling disk!\n",
2210				  type);
2211			break;
2212		case 1:
2213			sd_printk(KERN_NOTICE, sdkp,
2214				  "Enabling DIF Type %u protection\n", type);
2215			break;
2216		case 0:
2217			sd_printk(KERN_NOTICE, sdkp,
2218				  "Disabling DIF Type %u protection\n", type);
2219			break;
2220		}
2221
2222	sdkp->protection_type = type;
2223
2224	return ret;
2225}
2226
2227static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2228			struct scsi_sense_hdr *sshdr, int sense_valid,
2229			int the_result)
2230{
2231	if (driver_byte(the_result) == DRIVER_SENSE)
2232		sd_print_sense_hdr(sdkp, sshdr);
2233	else
2234		sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2235
2236	/*
2237	 * Set dirty bit for removable devices if not ready -
2238	 * sometimes drives will not report this properly.
2239	 */
2240	if (sdp->removable &&
2241	    sense_valid && sshdr->sense_key == NOT_READY)
2242		set_media_not_present(sdkp);
2243
2244	/*
2245	 * We used to set media_present to 0 here to indicate no media
2246	 * in the drive, but some drives fail read capacity even with
2247	 * media present, so we can't do that.
2248	 */
2249	sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2250}
2251
2252#define RC16_LEN 32
2253#if RC16_LEN > SD_BUF_SIZE
2254#error RC16_LEN must not be more than SD_BUF_SIZE
2255#endif
2256
2257#define READ_CAPACITY_RETRIES_ON_RESET	10
2258
2259static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2260						unsigned char *buffer)
2261{
2262	unsigned char cmd[16];
2263	struct scsi_sense_hdr sshdr;
2264	int sense_valid = 0;
2265	int the_result;
2266	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2267	unsigned int alignment;
2268	unsigned long long lba;
2269	unsigned sector_size;
2270
2271	if (sdp->no_read_capacity_16)
2272		return -EINVAL;
2273
2274	do {
2275		memset(cmd, 0, 16);
2276		cmd[0] = SERVICE_ACTION_IN_16;
2277		cmd[1] = SAI_READ_CAPACITY_16;
2278		cmd[13] = RC16_LEN;
2279		memset(buffer, 0, RC16_LEN);
2280
2281		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2282					buffer, RC16_LEN, &sshdr,
2283					SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2284
2285		if (media_not_present(sdkp, &sshdr))
2286			return -ENODEV;
2287
2288		if (the_result) {
2289			sense_valid = scsi_sense_valid(&sshdr);
2290			if (sense_valid &&
2291			    sshdr.sense_key == ILLEGAL_REQUEST &&
2292			    (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2293			    sshdr.ascq == 0x00)
2294				/* Invalid Command Operation Code or
2295				 * Invalid Field in CDB, just retry
2296				 * silently with RC10 */
2297				return -EINVAL;
2298			if (sense_valid &&
2299			    sshdr.sense_key == UNIT_ATTENTION &&
2300			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2301				/* Device reset might occur several times,
2302				 * give it one more chance */
2303				if (--reset_retries > 0)
2304					continue;
2305		}
2306		retries--;
2307
2308	} while (the_result && retries);
2309
2310	if (the_result) {
2311		sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2312		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2313		return -EINVAL;
2314	}
2315
2316	sector_size = get_unaligned_be32(&buffer[8]);
2317	lba = get_unaligned_be64(&buffer[0]);
2318
2319	if (sd_read_protection_type(sdkp, buffer) < 0) {
2320		sdkp->capacity = 0;
2321		return -ENODEV;
2322	}
2323
 
 
 
 
 
 
 
 
2324	/* Logical blocks per physical block exponent */
2325	sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2326
2327	/* RC basis */
2328	sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2329
2330	/* Lowest aligned logical block */
2331	alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2332	blk_queue_alignment_offset(sdp->request_queue, alignment);
2333	if (alignment && sdkp->first_scan)
2334		sd_printk(KERN_NOTICE, sdkp,
2335			  "physical block alignment offset: %u\n", alignment);
2336
2337	if (buffer[14] & 0x80) { /* LBPME */
2338		sdkp->lbpme = 1;
2339
2340		if (buffer[14] & 0x40) /* LBPRZ */
2341			sdkp->lbprz = 1;
2342
2343		sd_config_discard(sdkp, SD_LBP_WS16);
2344	}
2345
2346	sdkp->capacity = lba + 1;
2347	return sector_size;
2348}
2349
2350static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2351						unsigned char *buffer)
2352{
2353	unsigned char cmd[16];
2354	struct scsi_sense_hdr sshdr;
2355	int sense_valid = 0;
2356	int the_result;
2357	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2358	sector_t lba;
2359	unsigned sector_size;
2360
2361	do {
2362		cmd[0] = READ_CAPACITY;
2363		memset(&cmd[1], 0, 9);
2364		memset(buffer, 0, 8);
2365
2366		the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2367					buffer, 8, &sshdr,
2368					SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2369
2370		if (media_not_present(sdkp, &sshdr))
2371			return -ENODEV;
2372
2373		if (the_result) {
2374			sense_valid = scsi_sense_valid(&sshdr);
2375			if (sense_valid &&
2376			    sshdr.sense_key == UNIT_ATTENTION &&
2377			    sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2378				/* Device reset might occur several times,
2379				 * give it one more chance */
2380				if (--reset_retries > 0)
2381					continue;
2382		}
2383		retries--;
2384
2385	} while (the_result && retries);
2386
2387	if (the_result) {
2388		sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2389		read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2390		return -EINVAL;
2391	}
2392
2393	sector_size = get_unaligned_be32(&buffer[4]);
2394	lba = get_unaligned_be32(&buffer[0]);
2395
2396	if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2397		/* Some buggy (usb cardreader) devices return an lba of
2398		   0xffffffff when the want to report a size of 0 (with
2399		   which they really mean no media is present) */
2400		sdkp->capacity = 0;
2401		sdkp->physical_block_size = sector_size;
2402		return sector_size;
2403	}
2404
 
 
 
 
 
 
 
 
2405	sdkp->capacity = lba + 1;
2406	sdkp->physical_block_size = sector_size;
2407	return sector_size;
2408}
2409
2410static int sd_try_rc16_first(struct scsi_device *sdp)
2411{
2412	if (sdp->host->max_cmd_len < 16)
2413		return 0;
2414	if (sdp->try_rc_10_first)
2415		return 0;
2416	if (sdp->scsi_level > SCSI_SPC_2)
2417		return 1;
2418	if (scsi_device_protection(sdp))
2419		return 1;
2420	return 0;
2421}
2422
2423/*
2424 * read disk capacity
2425 */
2426static void
2427sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2428{
2429	int sector_size;
2430	struct scsi_device *sdp = sdkp->device;
2431
2432	if (sd_try_rc16_first(sdp)) {
2433		sector_size = read_capacity_16(sdkp, sdp, buffer);
2434		if (sector_size == -EOVERFLOW)
2435			goto got_data;
2436		if (sector_size == -ENODEV)
2437			return;
2438		if (sector_size < 0)
2439			sector_size = read_capacity_10(sdkp, sdp, buffer);
2440		if (sector_size < 0)
2441			return;
2442	} else {
2443		sector_size = read_capacity_10(sdkp, sdp, buffer);
2444		if (sector_size == -EOVERFLOW)
2445			goto got_data;
2446		if (sector_size < 0)
2447			return;
2448		if ((sizeof(sdkp->capacity) > 4) &&
2449		    (sdkp->capacity > 0xffffffffULL)) {
2450			int old_sector_size = sector_size;
2451			sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2452					"Trying to use READ CAPACITY(16).\n");
2453			sector_size = read_capacity_16(sdkp, sdp, buffer);
2454			if (sector_size < 0) {
2455				sd_printk(KERN_NOTICE, sdkp,
2456					"Using 0xffffffff as device size\n");
2457				sdkp->capacity = 1 + (sector_t) 0xffffffff;
2458				sector_size = old_sector_size;
2459				goto got_data;
2460			}
2461			/* Remember that READ CAPACITY(16) succeeded */
2462			sdp->try_rc_10_first = 0;
2463		}
2464	}
2465
2466	/* Some devices are known to return the total number of blocks,
2467	 * not the highest block number.  Some devices have versions
2468	 * which do this and others which do not.  Some devices we might
2469	 * suspect of doing this but we don't know for certain.
2470	 *
2471	 * If we know the reported capacity is wrong, decrement it.  If
2472	 * we can only guess, then assume the number of blocks is even
2473	 * (usually true but not always) and err on the side of lowering
2474	 * the capacity.
2475	 */
2476	if (sdp->fix_capacity ||
2477	    (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2478		sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2479				"from its reported value: %llu\n",
2480				(unsigned long long) sdkp->capacity);
2481		--sdkp->capacity;
2482	}
2483
2484got_data:
2485	if (sector_size == 0) {
2486		sector_size = 512;
2487		sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2488			  "assuming 512.\n");
2489	}
2490
2491	if (sector_size != 512 &&
2492	    sector_size != 1024 &&
2493	    sector_size != 2048 &&
2494	    sector_size != 4096) {
2495		sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2496			  sector_size);
2497		/*
2498		 * The user might want to re-format the drive with
2499		 * a supported sectorsize.  Once this happens, it
2500		 * would be relatively trivial to set the thing up.
2501		 * For this reason, we leave the thing in the table.
2502		 */
2503		sdkp->capacity = 0;
2504		/*
2505		 * set a bogus sector size so the normal read/write
2506		 * logic in the block layer will eventually refuse any
2507		 * request on this device without tripping over power
2508		 * of two sector size assumptions
2509		 */
2510		sector_size = 512;
2511	}
2512	blk_queue_logical_block_size(sdp->request_queue, sector_size);
2513	blk_queue_physical_block_size(sdp->request_queue,
2514				      sdkp->physical_block_size);
2515	sdkp->device->sector_size = sector_size;
2516
2517	if (sdkp->capacity > 0xffffffff)
2518		sdp->use_16_for_rw = 1;
2519
2520}
2521
2522/*
2523 * Print disk capacity
2524 */
2525static void
2526sd_print_capacity(struct scsi_disk *sdkp,
2527		  sector_t old_capacity)
2528{
2529	int sector_size = sdkp->device->sector_size;
2530	char cap_str_2[10], cap_str_10[10];
2531
2532	if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2533		return;
2534
2535	string_get_size(sdkp->capacity, sector_size,
2536			STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2537	string_get_size(sdkp->capacity, sector_size,
2538			STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
 
2539
2540	sd_printk(KERN_NOTICE, sdkp,
2541		  "%llu %d-byte logical blocks: (%s/%s)\n",
2542		  (unsigned long long)sdkp->capacity,
2543		  sector_size, cap_str_10, cap_str_2);
 
2544
2545	if (sdkp->physical_block_size != sector_size)
2546		sd_printk(KERN_NOTICE, sdkp,
2547			  "%u-byte physical blocks\n",
2548			  sdkp->physical_block_size);
2549
2550	sd_zbc_print_zones(sdkp);
 
2551}
2552
2553/* called with buffer of length 512 */
2554static inline int
2555sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2556		 unsigned char *buffer, int len, struct scsi_mode_data *data,
2557		 struct scsi_sense_hdr *sshdr)
2558{
2559	return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2560			       SD_TIMEOUT, SD_MAX_RETRIES, data,
2561			       sshdr);
2562}
2563
2564/*
2565 * read write protect setting, if possible - called only in sd_revalidate_disk()
2566 * called with buffer of length SD_BUF_SIZE
2567 */
2568static void
2569sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2570{
2571	int res;
2572	struct scsi_device *sdp = sdkp->device;
2573	struct scsi_mode_data data;
2574	int old_wp = sdkp->write_prot;
2575
2576	set_disk_ro(sdkp->disk, 0);
2577	if (sdp->skip_ms_page_3f) {
2578		sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2579		return;
2580	}
2581
2582	if (sdp->use_192_bytes_for_3f) {
2583		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2584	} else {
2585		/*
2586		 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2587		 * We have to start carefully: some devices hang if we ask
2588		 * for more than is available.
2589		 */
2590		res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2591
2592		/*
2593		 * Second attempt: ask for page 0 When only page 0 is
2594		 * implemented, a request for page 3F may return Sense Key
2595		 * 5: Illegal Request, Sense Code 24: Invalid field in
2596		 * CDB.
2597		 */
2598		if (!scsi_status_is_good(res))
2599			res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2600
2601		/*
2602		 * Third attempt: ask 255 bytes, as we did earlier.
2603		 */
2604		if (!scsi_status_is_good(res))
2605			res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2606					       &data, NULL);
2607	}
2608
2609	if (!scsi_status_is_good(res)) {
2610		sd_first_printk(KERN_WARNING, sdkp,
2611			  "Test WP failed, assume Write Enabled\n");
2612	} else {
2613		sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2614		set_disk_ro(sdkp->disk, sdkp->write_prot);
2615		if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2616			sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2617				  sdkp->write_prot ? "on" : "off");
2618			sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2619		}
2620	}
2621}
2622
2623/*
2624 * sd_read_cache_type - called only from sd_revalidate_disk()
2625 * called with buffer of length SD_BUF_SIZE
2626 */
2627static void
2628sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2629{
2630	int len = 0, res;
2631	struct scsi_device *sdp = sdkp->device;
2632
2633	int dbd;
2634	int modepage;
2635	int first_len;
2636	struct scsi_mode_data data;
2637	struct scsi_sense_hdr sshdr;
2638	int old_wce = sdkp->WCE;
2639	int old_rcd = sdkp->RCD;
2640	int old_dpofua = sdkp->DPOFUA;
2641
2642
2643	if (sdkp->cache_override)
2644		return;
2645
2646	first_len = 4;
2647	if (sdp->skip_ms_page_8) {
2648		if (sdp->type == TYPE_RBC)
2649			goto defaults;
2650		else {
2651			if (sdp->skip_ms_page_3f)
2652				goto defaults;
2653			modepage = 0x3F;
2654			if (sdp->use_192_bytes_for_3f)
2655				first_len = 192;
2656			dbd = 0;
2657		}
2658	} else if (sdp->type == TYPE_RBC) {
2659		modepage = 6;
2660		dbd = 8;
2661	} else {
2662		modepage = 8;
2663		dbd = 0;
2664	}
2665
2666	/* cautiously ask */
2667	res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2668			&data, &sshdr);
2669
2670	if (!scsi_status_is_good(res))
2671		goto bad_sense;
2672
2673	if (!data.header_length) {
2674		modepage = 6;
2675		first_len = 0;
2676		sd_first_printk(KERN_ERR, sdkp,
2677				"Missing header in MODE_SENSE response\n");
2678	}
2679
2680	/* that went OK, now ask for the proper length */
2681	len = data.length;
2682
2683	/*
2684	 * We're only interested in the first three bytes, actually.
2685	 * But the data cache page is defined for the first 20.
2686	 */
2687	if (len < 3)
2688		goto bad_sense;
2689	else if (len > SD_BUF_SIZE) {
2690		sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2691			  "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2692		len = SD_BUF_SIZE;
2693	}
2694	if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2695		len = 192;
2696
2697	/* Get the data */
2698	if (len > first_len)
2699		res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2700				&data, &sshdr);
2701
2702	if (scsi_status_is_good(res)) {
2703		int offset = data.header_length + data.block_descriptor_length;
2704
2705		while (offset < len) {
2706			u8 page_code = buffer[offset] & 0x3F;
2707			u8 spf       = buffer[offset] & 0x40;
2708
2709			if (page_code == 8 || page_code == 6) {
2710				/* We're interested only in the first 3 bytes.
2711				 */
2712				if (len - offset <= 2) {
2713					sd_first_printk(KERN_ERR, sdkp,
2714						"Incomplete mode parameter "
2715							"data\n");
2716					goto defaults;
2717				} else {
2718					modepage = page_code;
2719					goto Page_found;
2720				}
2721			} else {
2722				/* Go to the next page */
2723				if (spf && len - offset > 3)
2724					offset += 4 + (buffer[offset+2] << 8) +
2725						buffer[offset+3];
2726				else if (!spf && len - offset > 1)
2727					offset += 2 + buffer[offset+1];
2728				else {
2729					sd_first_printk(KERN_ERR, sdkp,
2730							"Incomplete mode "
2731							"parameter data\n");
2732					goto defaults;
2733				}
2734			}
2735		}
2736
2737		sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2738		goto defaults;
2739
2740	Page_found:
2741		if (modepage == 8) {
2742			sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2743			sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2744		} else {
2745			sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2746			sdkp->RCD = 0;
2747		}
2748
2749		sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2750		if (sdp->broken_fua) {
2751			sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2752			sdkp->DPOFUA = 0;
2753		} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2754			   !sdkp->device->use_16_for_rw) {
2755			sd_first_printk(KERN_NOTICE, sdkp,
2756				  "Uses READ/WRITE(6), disabling FUA\n");
2757			sdkp->DPOFUA = 0;
2758		}
2759
2760		/* No cache flush allowed for write protected devices */
2761		if (sdkp->WCE && sdkp->write_prot)
2762			sdkp->WCE = 0;
2763
2764		if (sdkp->first_scan || old_wce != sdkp->WCE ||
2765		    old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2766			sd_printk(KERN_NOTICE, sdkp,
2767				  "Write cache: %s, read cache: %s, %s\n",
2768				  sdkp->WCE ? "enabled" : "disabled",
2769				  sdkp->RCD ? "disabled" : "enabled",
2770				  sdkp->DPOFUA ? "supports DPO and FUA"
2771				  : "doesn't support DPO or FUA");
2772
2773		return;
2774	}
2775
2776bad_sense:
2777	if (scsi_sense_valid(&sshdr) &&
2778	    sshdr.sense_key == ILLEGAL_REQUEST &&
2779	    sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2780		/* Invalid field in CDB */
2781		sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2782	else
2783		sd_first_printk(KERN_ERR, sdkp,
2784				"Asking for cache data failed\n");
2785
2786defaults:
2787	if (sdp->wce_default_on) {
2788		sd_first_printk(KERN_NOTICE, sdkp,
2789				"Assuming drive cache: write back\n");
2790		sdkp->WCE = 1;
2791	} else {
2792		sd_first_printk(KERN_ERR, sdkp,
2793				"Assuming drive cache: write through\n");
2794		sdkp->WCE = 0;
2795	}
2796	sdkp->RCD = 0;
2797	sdkp->DPOFUA = 0;
2798}
2799
2800/*
2801 * The ATO bit indicates whether the DIF application tag is available
2802 * for use by the operating system.
2803 */
2804static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2805{
2806	int res, offset;
2807	struct scsi_device *sdp = sdkp->device;
2808	struct scsi_mode_data data;
2809	struct scsi_sense_hdr sshdr;
2810
2811	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2812		return;
2813
2814	if (sdkp->protection_type == 0)
2815		return;
2816
2817	res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2818			      SD_MAX_RETRIES, &data, &sshdr);
2819
2820	if (!scsi_status_is_good(res) || !data.header_length ||
2821	    data.length < 6) {
2822		sd_first_printk(KERN_WARNING, sdkp,
2823			  "getting Control mode page failed, assume no ATO\n");
2824
2825		if (scsi_sense_valid(&sshdr))
2826			sd_print_sense_hdr(sdkp, &sshdr);
2827
2828		return;
2829	}
2830
2831	offset = data.header_length + data.block_descriptor_length;
2832
2833	if ((buffer[offset] & 0x3f) != 0x0a) {
2834		sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2835		return;
2836	}
2837
2838	if ((buffer[offset + 5] & 0x80) == 0)
2839		return;
2840
2841	sdkp->ATO = 1;
2842
2843	return;
2844}
2845
2846/**
2847 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2848 * @sdkp: disk to query
2849 */
2850static void sd_read_block_limits(struct scsi_disk *sdkp)
2851{
2852	unsigned int sector_sz = sdkp->device->sector_size;
2853	const int vpd_len = 64;
2854	unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2855
2856	if (!buffer ||
2857	    /* Block Limits VPD */
2858	    scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2859		goto out;
2860
2861	blk_queue_io_min(sdkp->disk->queue,
2862			 get_unaligned_be16(&buffer[6]) * sector_sz);
2863
2864	sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2865	sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2866
2867	if (buffer[3] == 0x3c) {
2868		unsigned int lba_count, desc_count;
2869
2870		sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2871
2872		if (!sdkp->lbpme)
2873			goto out;
2874
2875		lba_count = get_unaligned_be32(&buffer[20]);
2876		desc_count = get_unaligned_be32(&buffer[24]);
2877
2878		if (lba_count && desc_count)
2879			sdkp->max_unmap_blocks = lba_count;
2880
2881		sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2882
2883		if (buffer[32] & 0x80)
2884			sdkp->unmap_alignment =
2885				get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2886
2887		if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2888
2889			if (sdkp->max_unmap_blocks)
2890				sd_config_discard(sdkp, SD_LBP_UNMAP);
2891			else
2892				sd_config_discard(sdkp, SD_LBP_WS16);
2893
2894		} else {	/* LBP VPD page tells us what to use */
2895			if (sdkp->lbpu && sdkp->max_unmap_blocks)
2896				sd_config_discard(sdkp, SD_LBP_UNMAP);
2897			else if (sdkp->lbpws)
2898				sd_config_discard(sdkp, SD_LBP_WS16);
2899			else if (sdkp->lbpws10)
2900				sd_config_discard(sdkp, SD_LBP_WS10);
 
 
2901			else
2902				sd_config_discard(sdkp, SD_LBP_DISABLE);
2903		}
2904	}
2905
2906 out:
2907	kfree(buffer);
2908}
2909
2910/**
2911 * sd_read_block_characteristics - Query block dev. characteristics
2912 * @sdkp: disk to query
2913 */
2914static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2915{
2916	struct request_queue *q = sdkp->disk->queue;
2917	unsigned char *buffer;
2918	u16 rot;
2919	const int vpd_len = 64;
2920
2921	buffer = kmalloc(vpd_len, GFP_KERNEL);
2922
2923	if (!buffer ||
2924	    /* Block Device Characteristics VPD */
2925	    scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2926		goto out;
2927
2928	rot = get_unaligned_be16(&buffer[4]);
2929
2930	if (rot == 1) {
2931		blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2932		blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2933	}
2934
2935	if (sdkp->device->type == TYPE_ZBC) {
2936		/* Host-managed */
2937		q->limits.zoned = BLK_ZONED_HM;
2938	} else {
2939		sdkp->zoned = (buffer[8] >> 4) & 3;
2940		if (sdkp->zoned == 1)
2941			/* Host-aware */
2942			q->limits.zoned = BLK_ZONED_HA;
2943		else
2944			/*
2945			 * Treat drive-managed devices as
2946			 * regular block devices.
2947			 */
2948			q->limits.zoned = BLK_ZONED_NONE;
2949	}
2950	if (blk_queue_is_zoned(q) && sdkp->first_scan)
2951		sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2952		      q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2953
2954 out:
2955	kfree(buffer);
2956}
2957
2958/**
2959 * sd_read_block_provisioning - Query provisioning VPD page
2960 * @sdkp: disk to query
2961 */
2962static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2963{
2964	unsigned char *buffer;
2965	const int vpd_len = 8;
2966
2967	if (sdkp->lbpme == 0)
2968		return;
2969
2970	buffer = kmalloc(vpd_len, GFP_KERNEL);
2971
2972	if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2973		goto out;
2974
2975	sdkp->lbpvpd	= 1;
2976	sdkp->lbpu	= (buffer[5] >> 7) & 1;	/* UNMAP */
2977	sdkp->lbpws	= (buffer[5] >> 6) & 1;	/* WRITE SAME(16) with UNMAP */
2978	sdkp->lbpws10	= (buffer[5] >> 5) & 1;	/* WRITE SAME(10) with UNMAP */
2979
2980 out:
2981	kfree(buffer);
2982}
2983
2984static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2985{
2986	struct scsi_device *sdev = sdkp->device;
2987
2988	if (sdev->host->no_write_same) {
2989		sdev->no_write_same = 1;
2990
2991		return;
2992	}
2993
2994	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2995		/* too large values might cause issues with arcmsr */
2996		int vpd_buf_len = 64;
2997
2998		sdev->no_report_opcodes = 1;
2999
3000		/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3001		 * CODES is unsupported and the device has an ATA
3002		 * Information VPD page (SAT).
3003		 */
3004		if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3005			sdev->no_write_same = 1;
3006	}
3007
3008	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3009		sdkp->ws16 = 1;
3010
3011	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3012		sdkp->ws10 = 1;
3013}
3014
3015static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3016{
3017	struct scsi_device *sdev = sdkp->device;
3018
3019	if (!sdev->security_supported)
3020		return;
3021
3022	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3023			SECURITY_PROTOCOL_IN) == 1 &&
3024	    scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3025			SECURITY_PROTOCOL_OUT) == 1)
3026		sdkp->security = 1;
3027}
3028
3029/*
3030 * Determine the device's preferred I/O size for reads and writes
3031 * unless the reported value is unreasonably small, large, not a
3032 * multiple of the physical block size, or simply garbage.
3033 */
3034static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3035				      unsigned int dev_max)
3036{
3037	struct scsi_device *sdp = sdkp->device;
3038	unsigned int opt_xfer_bytes =
3039		logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3040
3041	if (sdkp->opt_xfer_blocks == 0)
3042		return false;
3043
3044	if (sdkp->opt_xfer_blocks > dev_max) {
3045		sd_first_printk(KERN_WARNING, sdkp,
3046				"Optimal transfer size %u logical blocks " \
3047				"> dev_max (%u logical blocks)\n",
3048				sdkp->opt_xfer_blocks, dev_max);
3049		return false;
3050	}
3051
3052	if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3053		sd_first_printk(KERN_WARNING, sdkp,
3054				"Optimal transfer size %u logical blocks " \
3055				"> sd driver limit (%u logical blocks)\n",
3056				sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3057		return false;
3058	}
3059
3060	if (opt_xfer_bytes < PAGE_SIZE) {
3061		sd_first_printk(KERN_WARNING, sdkp,
3062				"Optimal transfer size %u bytes < " \
3063				"PAGE_SIZE (%u bytes)\n",
3064				opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3065		return false;
3066	}
3067
3068	if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3069		sd_first_printk(KERN_WARNING, sdkp,
3070				"Optimal transfer size %u bytes not a " \
3071				"multiple of physical block size (%u bytes)\n",
3072				opt_xfer_bytes, sdkp->physical_block_size);
3073		return false;
3074	}
3075
3076	sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3077			opt_xfer_bytes);
3078	return true;
3079}
3080
3081/**
3082 *	sd_revalidate_disk - called the first time a new disk is seen,
3083 *	performs disk spin up, read_capacity, etc.
3084 *	@disk: struct gendisk we care about
3085 **/
3086static int sd_revalidate_disk(struct gendisk *disk)
3087{
3088	struct scsi_disk *sdkp = scsi_disk(disk);
3089	struct scsi_device *sdp = sdkp->device;
3090	struct request_queue *q = sdkp->disk->queue;
3091	sector_t old_capacity = sdkp->capacity;
3092	unsigned char *buffer;
3093	unsigned int dev_max, rw_max;
3094
3095	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3096				      "sd_revalidate_disk\n"));
3097
3098	/*
3099	 * If the device is offline, don't try and read capacity or any
3100	 * of the other niceties.
3101	 */
3102	if (!scsi_device_online(sdp))
3103		goto out;
3104
3105	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3106	if (!buffer) {
3107		sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3108			  "allocation failure.\n");
3109		goto out;
3110	}
3111
3112	sd_spinup_disk(sdkp);
3113
3114	/*
3115	 * Without media there is no reason to ask; moreover, some devices
3116	 * react badly if we do.
3117	 */
3118	if (sdkp->media_present) {
3119		sd_read_capacity(sdkp, buffer);
3120
3121		/*
3122		 * set the default to rotational.  All non-rotational devices
3123		 * support the block characteristics VPD page, which will
3124		 * cause this to be updated correctly and any device which
3125		 * doesn't support it should be treated as rotational.
3126		 */
3127		blk_queue_flag_clear(QUEUE_FLAG_NONROT, q);
3128		blk_queue_flag_set(QUEUE_FLAG_ADD_RANDOM, q);
3129
3130		if (scsi_device_supports_vpd(sdp)) {
3131			sd_read_block_provisioning(sdkp);
3132			sd_read_block_limits(sdkp);
3133			sd_read_block_characteristics(sdkp);
3134			sd_zbc_read_zones(sdkp, buffer);
3135		}
3136
3137		sd_print_capacity(sdkp, old_capacity);
3138
3139		sd_read_write_protect_flag(sdkp, buffer);
3140		sd_read_cache_type(sdkp, buffer);
3141		sd_read_app_tag_own(sdkp, buffer);
3142		sd_read_write_same(sdkp, buffer);
3143		sd_read_security(sdkp, buffer);
3144	}
3145
 
 
3146	/*
3147	 * We now have all cache related info, determine how we deal
3148	 * with flush requests.
3149	 */
3150	sd_set_flush_flag(sdkp);
3151
3152	/* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3153	dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3154
3155	/* Some devices report a maximum block count for READ/WRITE requests. */
3156	dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3157	q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3158
3159	if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
 
 
 
 
 
 
 
 
3160		q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3161		rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3162	} else
3163		rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3164				      (sector_t)BLK_DEF_MAX_SECTORS);
3165
3166	/* Do not exceed controller limit */
3167	rw_max = min(rw_max, queue_max_hw_sectors(q));
3168
3169	/*
3170	 * Only update max_sectors if previously unset or if the current value
3171	 * exceeds the capabilities of the hardware.
3172	 */
3173	if (sdkp->first_scan ||
3174	    q->limits.max_sectors > q->limits.max_dev_sectors ||
3175	    q->limits.max_sectors > q->limits.max_hw_sectors)
3176		q->limits.max_sectors = rw_max;
3177
3178	sdkp->first_scan = 0;
 
3179
3180	set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3181	sd_config_write_same(sdkp);
3182	kfree(buffer);
3183
3184 out:
3185	return 0;
3186}
3187
3188/**
3189 *	sd_unlock_native_capacity - unlock native capacity
3190 *	@disk: struct gendisk to set capacity for
3191 *
3192 *	Block layer calls this function if it detects that partitions
3193 *	on @disk reach beyond the end of the device.  If the SCSI host
3194 *	implements ->unlock_native_capacity() method, it's invoked to
3195 *	give it a chance to adjust the device capacity.
3196 *
3197 *	CONTEXT:
3198 *	Defined by block layer.  Might sleep.
3199 */
3200static void sd_unlock_native_capacity(struct gendisk *disk)
3201{
3202	struct scsi_device *sdev = scsi_disk(disk)->device;
3203
3204	if (sdev->host->hostt->unlock_native_capacity)
3205		sdev->host->hostt->unlock_native_capacity(sdev);
3206}
3207
3208/**
3209 *	sd_format_disk_name - format disk name
3210 *	@prefix: name prefix - ie. "sd" for SCSI disks
3211 *	@index: index of the disk to format name for
3212 *	@buf: output buffer
3213 *	@buflen: length of the output buffer
3214 *
3215 *	SCSI disk names starts at sda.  The 26th device is sdz and the
3216 *	27th is sdaa.  The last one for two lettered suffix is sdzz
3217 *	which is followed by sdaaa.
3218 *
3219 *	This is basically 26 base counting with one extra 'nil' entry
3220 *	at the beginning from the second digit on and can be
3221 *	determined using similar method as 26 base conversion with the
3222 *	index shifted -1 after each digit is computed.
3223 *
3224 *	CONTEXT:
3225 *	Don't care.
3226 *
3227 *	RETURNS:
3228 *	0 on success, -errno on failure.
3229 */
3230static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3231{
3232	const int base = 'z' - 'a' + 1;
3233	char *begin = buf + strlen(prefix);
3234	char *end = buf + buflen;
3235	char *p;
3236	int unit;
3237
3238	p = end - 1;
3239	*p = '\0';
3240	unit = base;
3241	do {
3242		if (p == begin)
3243			return -EINVAL;
3244		*--p = 'a' + (index % unit);
3245		index = (index / unit) - 1;
3246	} while (index >= 0);
3247
3248	memmove(begin, p, end - p);
3249	memcpy(buf, prefix, strlen(prefix));
3250
3251	return 0;
3252}
3253
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3254/**
3255 *	sd_probe - called during driver initialization and whenever a
3256 *	new scsi device is attached to the system. It is called once
3257 *	for each scsi device (not just disks) present.
3258 *	@dev: pointer to device object
3259 *
3260 *	Returns 0 if successful (or not interested in this scsi device 
3261 *	(e.g. scanner)); 1 when there is an error.
3262 *
3263 *	Note: this function is invoked from the scsi mid-level.
3264 *	This function sets up the mapping between a given 
3265 *	<host,channel,id,lun> (found in sdp) and new device name 
3266 *	(e.g. /dev/sda). More precisely it is the block device major 
3267 *	and minor number that is chosen here.
3268 *
3269 *	Assume sd_probe is not re-entrant (for time being)
3270 *	Also think about sd_probe() and sd_remove() running coincidentally.
3271 **/
3272static int sd_probe(struct device *dev)
3273{
3274	struct scsi_device *sdp = to_scsi_device(dev);
3275	struct scsi_disk *sdkp;
3276	struct gendisk *gd;
3277	int index;
3278	int error;
3279
3280	scsi_autopm_get_device(sdp);
3281	error = -ENODEV;
3282	if (sdp->type != TYPE_DISK &&
3283	    sdp->type != TYPE_ZBC &&
3284	    sdp->type != TYPE_MOD &&
3285	    sdp->type != TYPE_RBC)
3286		goto out;
3287
3288#ifndef CONFIG_BLK_DEV_ZONED
3289	if (sdp->type == TYPE_ZBC)
3290		goto out;
3291#endif
3292	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3293					"sd_probe\n"));
3294
3295	error = -ENOMEM;
3296	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3297	if (!sdkp)
3298		goto out;
3299
3300	gd = alloc_disk(SD_MINORS);
3301	if (!gd)
3302		goto out_free;
3303
3304	index = ida_alloc(&sd_index_ida, GFP_KERNEL);
3305	if (index < 0) {
 
 
 
 
 
 
 
 
3306		sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3307		goto out_put;
3308	}
3309
3310	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3311	if (error) {
3312		sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3313		goto out_free_index;
3314	}
3315
3316	sdkp->device = sdp;
3317	sdkp->driver = &sd_template;
3318	sdkp->disk = gd;
3319	sdkp->index = index;
3320	atomic_set(&sdkp->openers, 0);
3321	atomic_set(&sdkp->device->ioerr_cnt, 0);
3322
3323	if (!sdp->request_queue->rq_timeout) {
3324		if (sdp->type != TYPE_MOD)
3325			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3326		else
3327			blk_queue_rq_timeout(sdp->request_queue,
3328					     SD_MOD_TIMEOUT);
3329	}
3330
3331	device_initialize(&sdkp->dev);
3332	sdkp->dev.parent = dev;
3333	sdkp->dev.class = &sd_disk_class;
3334	dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3335
3336	error = device_add(&sdkp->dev);
3337	if (error)
3338		goto out_free_index;
3339
3340	get_device(dev);
3341	dev_set_drvdata(dev, sdkp);
3342
3343	gd->major = sd_major((index & 0xf0) >> 4);
3344	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3345
3346	gd->fops = &sd_fops;
3347	gd->private_data = &sdkp->driver;
3348	gd->queue = sdkp->device->request_queue;
3349
3350	/* defaults, until the device tells us otherwise */
3351	sdp->sector_size = 512;
3352	sdkp->capacity = 0;
3353	sdkp->media_present = 1;
3354	sdkp->write_prot = 0;
3355	sdkp->cache_override = 0;
3356	sdkp->WCE = 0;
3357	sdkp->RCD = 0;
3358	sdkp->ATO = 0;
3359	sdkp->first_scan = 1;
3360	sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3361
3362	sd_revalidate_disk(gd);
3363
3364	gd->flags = GENHD_FL_EXT_DEVT;
3365	if (sdp->removable) {
3366		gd->flags |= GENHD_FL_REMOVABLE;
3367		gd->events |= DISK_EVENT_MEDIA_CHANGE;
3368		gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
3369	}
3370
3371	blk_pm_runtime_init(sdp->request_queue, dev);
3372	device_add_disk(dev, gd, NULL);
3373	if (sdkp->capacity)
3374		sd_dif_config_host(sdkp);
3375
3376	sd_revalidate_disk(gd);
3377
3378	if (sdkp->security) {
3379		sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3380		if (sdkp->opal_dev)
3381			sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3382	}
3383
3384	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3385		  sdp->removable ? "removable " : "");
3386	scsi_autopm_put_device(sdp);
3387
3388	return 0;
3389
3390 out_free_index:
3391	ida_free(&sd_index_ida, index);
 
 
3392 out_put:
3393	put_disk(gd);
3394 out_free:
3395	kfree(sdkp);
3396 out:
3397	scsi_autopm_put_device(sdp);
3398	return error;
3399}
3400
3401/**
3402 *	sd_remove - called whenever a scsi disk (previously recognized by
3403 *	sd_probe) is detached from the system. It is called (potentially
3404 *	multiple times) during sd module unload.
3405 *	@dev: pointer to device object
3406 *
3407 *	Note: this function is invoked from the scsi mid-level.
3408 *	This function potentially frees up a device name (e.g. /dev/sdc)
3409 *	that could be re-used by a subsequent sd_probe().
3410 *	This function is not called when the built-in sd driver is "exit-ed".
3411 **/
3412static int sd_remove(struct device *dev)
3413{
3414	struct scsi_disk *sdkp;
3415	dev_t devt;
3416
3417	sdkp = dev_get_drvdata(dev);
3418	devt = disk_devt(sdkp->disk);
3419	scsi_autopm_get_device(sdkp->device);
3420
3421	async_synchronize_full_domain(&scsi_sd_pm_domain);
 
3422	device_del(&sdkp->dev);
3423	del_gendisk(sdkp->disk);
3424	sd_shutdown(dev);
3425
3426	free_opal_dev(sdkp->opal_dev);
3427
3428	blk_register_region(devt, SD_MINORS, NULL,
3429			    sd_default_probe, NULL, NULL);
3430
3431	mutex_lock(&sd_ref_mutex);
3432	dev_set_drvdata(dev, NULL);
3433	put_device(&sdkp->dev);
3434	mutex_unlock(&sd_ref_mutex);
3435
3436	return 0;
3437}
3438
3439/**
3440 *	scsi_disk_release - Called to free the scsi_disk structure
3441 *	@dev: pointer to embedded class device
3442 *
3443 *	sd_ref_mutex must be held entering this routine.  Because it is
3444 *	called on last put, you should always use the scsi_disk_get()
3445 *	scsi_disk_put() helpers which manipulate the semaphore directly
3446 *	and never do a direct put_device.
3447 **/
3448static void scsi_disk_release(struct device *dev)
3449{
3450	struct scsi_disk *sdkp = to_scsi_disk(dev);
3451	struct gendisk *disk = sdkp->disk;
3452	struct request_queue *q = disk->queue;
3453
3454	ida_free(&sd_index_ida, sdkp->index);
3455
3456	/*
3457	 * Wait until all requests that are in progress have completed.
3458	 * This is necessary to avoid that e.g. scsi_end_request() crashes
3459	 * due to clearing the disk->private_data pointer. Wait from inside
3460	 * scsi_disk_release() instead of from sd_release() to avoid that
3461	 * freezing and unfreezing the request queue affects user space I/O
3462	 * in case multiple processes open a /dev/sd... node concurrently.
3463	 */
3464	blk_mq_freeze_queue(q);
3465	blk_mq_unfreeze_queue(q);
3466
3467	disk->private_data = NULL;
3468	put_disk(disk);
3469	put_device(&sdkp->device->sdev_gendev);
3470
3471	kfree(sdkp);
3472}
3473
3474static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3475{
3476	unsigned char cmd[6] = { START_STOP };	/* START_VALID */
3477	struct scsi_sense_hdr sshdr;
3478	struct scsi_device *sdp = sdkp->device;
3479	int res;
3480
3481	if (start)
3482		cmd[4] |= 1;	/* START */
3483
3484	if (sdp->start_stop_pwr_cond)
3485		cmd[4] |= start ? 1 << 4 : 3 << 4;	/* Active or Standby */
3486
3487	if (!scsi_device_online(sdp))
3488		return -ENODEV;
3489
3490	res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3491			SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3492	if (res) {
3493		sd_print_result(sdkp, "Start/Stop Unit failed", res);
3494		if (driver_byte(res) == DRIVER_SENSE)
3495			sd_print_sense_hdr(sdkp, &sshdr);
3496		if (scsi_sense_valid(&sshdr) &&
3497			/* 0x3a is medium not present */
3498			sshdr.asc == 0x3a)
3499			res = 0;
3500	}
3501
3502	/* SCSI error codes must not go to the generic layer */
3503	if (res)
3504		return -EIO;
3505
3506	return 0;
3507}
3508
3509/*
3510 * Send a SYNCHRONIZE CACHE instruction down to the device through
3511 * the normal SCSI command structure.  Wait for the command to
3512 * complete.
3513 */
3514static void sd_shutdown(struct device *dev)
3515{
3516	struct scsi_disk *sdkp = dev_get_drvdata(dev);
3517
3518	if (!sdkp)
3519		return;         /* this can happen */
3520
3521	if (pm_runtime_suspended(dev))
3522		return;
3523
3524	if (sdkp->WCE && sdkp->media_present) {
3525		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3526		sd_sync_cache(sdkp, NULL);
3527	}
3528
3529	if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3530		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3531		sd_start_stop_device(sdkp, 0);
3532	}
3533}
3534
3535static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3536{
3537	struct scsi_disk *sdkp = dev_get_drvdata(dev);
3538	struct scsi_sense_hdr sshdr;
3539	int ret = 0;
3540
3541	if (!sdkp)	/* E.g.: runtime suspend following sd_remove() */
3542		return 0;
3543
3544	if (sdkp->WCE && sdkp->media_present) {
3545		sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3546		ret = sd_sync_cache(sdkp, &sshdr);
3547
3548		if (ret) {
3549			/* ignore OFFLINE device */
3550			if (ret == -ENODEV)
3551				return 0;
3552
3553			if (!scsi_sense_valid(&sshdr) ||
3554			    sshdr.sense_key != ILLEGAL_REQUEST)
3555				return ret;
3556
3557			/*
3558			 * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3559			 * doesn't support sync. There's not much to do and
3560			 * suspend shouldn't fail.
3561			 */
3562			ret = 0;
3563		}
3564	}
3565
3566	if (sdkp->device->manage_start_stop) {
3567		sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3568		/* an error is not worth aborting a system sleep */
3569		ret = sd_start_stop_device(sdkp, 0);
3570		if (ignore_stop_errors)
3571			ret = 0;
3572	}
3573
 
3574	return ret;
3575}
3576
3577static int sd_suspend_system(struct device *dev)
3578{
3579	return sd_suspend_common(dev, true);
3580}
3581
3582static int sd_suspend_runtime(struct device *dev)
3583{
3584	return sd_suspend_common(dev, false);
3585}
3586
3587static int sd_resume(struct device *dev)
3588{
3589	struct scsi_disk *sdkp = dev_get_drvdata(dev);
3590	int ret;
3591
3592	if (!sdkp)	/* E.g.: runtime resume at the start of sd_probe() */
3593		return 0;
3594
3595	if (!sdkp->device->manage_start_stop)
3596		return 0;
3597
3598	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3599	ret = sd_start_stop_device(sdkp, 1);
3600	if (!ret)
3601		opal_unlock_from_suspend(sdkp->opal_dev);
3602	return ret;
3603}
3604
3605/**
3606 *	init_sd - entry point for this driver (both when built in or when
3607 *	a module).
3608 *
3609 *	Note: this function registers this driver with the scsi mid-level.
3610 **/
3611static int __init init_sd(void)
3612{
3613	int majors = 0, i, err;
3614
3615	SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3616
3617	for (i = 0; i < SD_MAJORS; i++) {
3618		if (register_blkdev(sd_major(i), "sd") != 0)
3619			continue;
3620		majors++;
3621		blk_register_region(sd_major(i), SD_MINORS, NULL,
3622				    sd_default_probe, NULL, NULL);
3623	}
3624
3625	if (!majors)
3626		return -ENODEV;
3627
3628	err = class_register(&sd_disk_class);
3629	if (err)
3630		goto err_out;
3631
3632	sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3633					 0, 0, NULL);
3634	if (!sd_cdb_cache) {
3635		printk(KERN_ERR "sd: can't init extended cdb cache\n");
3636		err = -ENOMEM;
3637		goto err_out_class;
3638	}
3639
3640	sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3641	if (!sd_cdb_pool) {
3642		printk(KERN_ERR "sd: can't init extended cdb pool\n");
3643		err = -ENOMEM;
3644		goto err_out_cache;
3645	}
3646
3647	sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
3648	if (!sd_page_pool) {
3649		printk(KERN_ERR "sd: can't init discard page pool\n");
3650		err = -ENOMEM;
3651		goto err_out_ppool;
3652	}
3653
3654	err = scsi_register_driver(&sd_template.gendrv);
3655	if (err)
3656		goto err_out_driver;
3657
3658	return 0;
3659
3660err_out_driver:
3661	mempool_destroy(sd_page_pool);
3662
3663err_out_ppool:
3664	mempool_destroy(sd_cdb_pool);
3665
3666err_out_cache:
3667	kmem_cache_destroy(sd_cdb_cache);
3668
3669err_out_class:
3670	class_unregister(&sd_disk_class);
3671err_out:
3672	for (i = 0; i < SD_MAJORS; i++)
3673		unregister_blkdev(sd_major(i), "sd");
3674	return err;
3675}
3676
3677/**
3678 *	exit_sd - exit point for this driver (when it is a module).
3679 *
3680 *	Note: this function unregisters this driver from the scsi mid-level.
3681 **/
3682static void __exit exit_sd(void)
3683{
3684	int i;
3685
3686	SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3687
3688	scsi_unregister_driver(&sd_template.gendrv);
3689	mempool_destroy(sd_cdb_pool);
3690	mempool_destroy(sd_page_pool);
3691	kmem_cache_destroy(sd_cdb_cache);
3692
3693	class_unregister(&sd_disk_class);
3694
3695	for (i = 0; i < SD_MAJORS; i++) {
3696		blk_unregister_region(sd_major(i), SD_MINORS);
3697		unregister_blkdev(sd_major(i), "sd");
3698	}
3699}
3700
3701module_init(init_sd);
3702module_exit(exit_sd);
3703
3704static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3705			       struct scsi_sense_hdr *sshdr)
3706{
3707	scsi_print_sense_hdr(sdkp->device,
3708			     sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3709}
3710
3711static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3712			    int result)
3713{
3714	const char *hb_string = scsi_hostbyte_string(result);
3715	const char *db_string = scsi_driverbyte_string(result);
3716
3717	if (hb_string || db_string)
3718		sd_printk(KERN_INFO, sdkp,
3719			  "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3720			  hb_string ? hb_string : "invalid",
3721			  db_string ? db_string : "invalid");
3722	else
3723		sd_printk(KERN_INFO, sdkp,
3724			  "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3725			  msg, host_byte(result), driver_byte(result));
3726}
3727