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/bio-integrity.h>
37	#include <linux/module.h>
38	#include <linux/fs.h>
39	#include <linux/kernel.h>
40	#include <linux/mm.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/blk-pm.h>
49	#include <linux/delay.h>
50	#include <linux/rw_hint.h>
51	#include <linux/major.h>
52	#include <linux/mutex.h>
53	#include <linux/string_helpers.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 <linux/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_devinfo.h>
67	#include <scsi/scsi_driver.h>
68	#include <scsi/scsi_eh.h>
69	#include <scsi/scsi_host.h>
70	#include <scsi/scsi_ioctl.h>
71	#include <scsi/scsicam.h>
72	#include <scsi/scsi_common.h>
73
74	#include "sd.h"
75	#include "scsi_priv.h"
76	#include "scsi_logging.h"
77
78	MODULE_AUTHOR("Eric Youngdale");
79	MODULE_DESCRIPTION("SCSI disk (sd) driver");
80	MODULE_LICENSE("GPL");
81
82	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
83	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
84	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
85	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
86	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
87	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
88	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
89	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
90	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
91	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
92	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
93	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
94	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
95	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
96	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
97	MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
98	MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
99	MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
100	MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
101	MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
102
103	#define SD_MINORS 16
104
105	static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
106	unsigned int mode);
107	static void sd_config_write_same(struct scsi_disk *sdkp,
108	struct queue_limits *lim);
109	static int sd_revalidate_disk(struct gendisk *);
110	static void sd_unlock_native_capacity(struct gendisk *disk);
111	static void sd_shutdown(struct device *);
112	static void scsi_disk_release(struct device *cdev);
113
114	static DEFINE_IDA(sd_index_ida);
115
116	static mempool_t *sd_page_pool;
117	static struct lock_class_key sd_bio_compl_lkclass;
118
119	static const char *sd_cache_types[] = {
120	"write through", "none", "write back",
121	"write back, no read (daft)"
122	};
123
124	static void sd_set_flush_flag(struct scsi_disk *sdkp,
125	struct queue_limits *lim)
126	{
127	if (sdkp->WCE) {
128	lim->features |= BLK_FEAT_WRITE_CACHE;
129	if (sdkp->DPOFUA)
130	lim->features |= BLK_FEAT_FUA;
131	else
132	lim->features &= ~BLK_FEAT_FUA;
133	} else {
134	lim->features &= ~(BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA);
135	}
136	}
137
138	static ssize_t
139	cache_type_store(struct device *dev, struct device_attribute *attr,
140	const char *buf, size_t count)
141	{
142	int ct, rcd, wce, sp;
143	struct scsi_disk *sdkp = to_scsi_disk(dev);
144	struct scsi_device *sdp = sdkp->device;
145	char buffer[64];
146	char *buffer_data;
147	struct scsi_mode_data data;
148	struct scsi_sense_hdr sshdr;
149	static const char temp[] = "temporary ";
150	int len, ret;
151
152	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
153	/* no cache control on RBC devices; theoretically they
154	* can do it, but there's probably so many exceptions
155	* it's not worth the risk */
156	return -EINVAL;
157
158	if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
159	buf += sizeof(temp) - 1;
160	sdkp->cache_override = 1;
161	} else {
162	sdkp->cache_override = 0;
163	}
164
165	ct = sysfs_match_string(sd_cache_types, buf);
166	if (ct < 0)
167	return -EINVAL;
168
169	rcd = ct & 0x01 ? 1 : 0;
170	wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
171
172	if (sdkp->cache_override) {
173	struct queue_limits lim;
174
175	sdkp->WCE = wce;
176	sdkp->RCD = rcd;
177
178	lim = queue_limits_start_update(q: sdkp->disk->queue);
179	sd_set_flush_flag(sdkp, lim: &lim);
180	ret = queue_limits_commit_update_frozen(q: sdkp->disk->queue,
181	lim: &lim);
182	if (ret)
183	return ret;
184	return count;
185	}
186
187	if (scsi_mode_sense(sdev: sdp, dbd: 0x08, modepage: 8, subpage: 0, buffer, len: sizeof(buffer), SD_TIMEOUT,
188	retries: sdkp->max_retries, data: &data, NULL))
189	return -EINVAL;
190	len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
191	data.block_descriptor_length);
192	buffer_data = buffer + data.header_length +
193	data.block_descriptor_length;
194	buffer_data[2] &= ~0x05;
195	buffer_data[2] |= wce << 2 | rcd;
196	sp = buffer_data[0] & 0x80 ? 1 : 0;
197	buffer_data[0] &= ~0x80;
198
199	/*
200	* Ensure WP, DPOFUA, and RESERVED fields are cleared in
201	* received mode parameter buffer before doing MODE SELECT.
202	*/
203	data.device_specific = 0;
204
205	ret = scsi_mode_select(sdev: sdp, pf: 1, sp, buffer: buffer_data, len, SD_TIMEOUT,
206	retries: sdkp->max_retries, data: &data, &sshdr);
207	if (ret) {
208	if (ret > 0 && scsi_sense_valid(sshdr: &sshdr))
209	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
210	return -EINVAL;
211	}
212	sd_revalidate_disk(sdkp->disk);
213	return count;
214	}
215
216	static ssize_t
217	manage_start_stop_show(struct device *dev,
218	struct device_attribute *attr, char *buf)
219	{
220	struct scsi_disk *sdkp = to_scsi_disk(dev);
221	struct scsi_device *sdp = sdkp->device;
222
223	return sysfs_emit(buf, fmt: "%u\n",
224	sdp->manage_system_start_stop &&
225	sdp->manage_runtime_start_stop &&
226	sdp->manage_shutdown);
227	}
228	static DEVICE_ATTR_RO(manage_start_stop);
229
230	static ssize_t
231	manage_system_start_stop_show(struct device *dev,
232	struct device_attribute *attr, char *buf)
233	{
234	struct scsi_disk *sdkp = to_scsi_disk(dev);
235	struct scsi_device *sdp = sdkp->device;
236
237	return sysfs_emit(buf, fmt: "%u\n", sdp->manage_system_start_stop);
238	}
239
240	static ssize_t
241	manage_system_start_stop_store(struct device *dev,
242	struct device_attribute *attr,
243	const char *buf, size_t count)
244	{
245	struct scsi_disk *sdkp = to_scsi_disk(dev);
246	struct scsi_device *sdp = sdkp->device;
247	bool v;
248
249	if (!capable(CAP_SYS_ADMIN))
250	return -EACCES;
251
252	if (kstrtobool(s: buf, res: &v))
253	return -EINVAL;
254
255	sdp->manage_system_start_stop = v;
256
257	return count;
258	}
259	static DEVICE_ATTR_RW(manage_system_start_stop);
260
261	static ssize_t
262	manage_runtime_start_stop_show(struct device *dev,
263	struct device_attribute *attr, char *buf)
264	{
265	struct scsi_disk *sdkp = to_scsi_disk(dev);
266	struct scsi_device *sdp = sdkp->device;
267
268	return sysfs_emit(buf, fmt: "%u\n", sdp->manage_runtime_start_stop);
269	}
270
271	static ssize_t
272	manage_runtime_start_stop_store(struct device *dev,
273	struct device_attribute *attr,
274	const char *buf, size_t count)
275	{
276	struct scsi_disk *sdkp = to_scsi_disk(dev);
277	struct scsi_device *sdp = sdkp->device;
278	bool v;
279
280	if (!capable(CAP_SYS_ADMIN))
281	return -EACCES;
282
283	if (kstrtobool(s: buf, res: &v))
284	return -EINVAL;
285
286	sdp->manage_runtime_start_stop = v;
287
288	return count;
289	}
290	static DEVICE_ATTR_RW(manage_runtime_start_stop);
291
292	static ssize_t manage_shutdown_show(struct device *dev,
293	struct device_attribute *attr, char *buf)
294	{
295	struct scsi_disk *sdkp = to_scsi_disk(dev);
296	struct scsi_device *sdp = sdkp->device;
297
298	return sysfs_emit(buf, fmt: "%u\n", sdp->manage_shutdown);
299	}
300
301	static ssize_t manage_shutdown_store(struct device *dev,
302	struct device_attribute *attr,
303	const char *buf, size_t count)
304	{
305	struct scsi_disk *sdkp = to_scsi_disk(dev);
306	struct scsi_device *sdp = sdkp->device;
307	bool v;
308
309	if (!capable(CAP_SYS_ADMIN))
310	return -EACCES;
311
312	if (kstrtobool(s: buf, res: &v))
313	return -EINVAL;
314
315	sdp->manage_shutdown = v;
316
317	return count;
318	}
319	static DEVICE_ATTR_RW(manage_shutdown);
320
321	static ssize_t
322	allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
323	{
324	struct scsi_disk *sdkp = to_scsi_disk(dev);
325
326	return sprintf(buf, fmt: "%u\n", sdkp->device->allow_restart);
327	}
328
329	static ssize_t
330	allow_restart_store(struct device *dev, struct device_attribute *attr,
331	const char *buf, size_t count)
332	{
333	bool v;
334	struct scsi_disk *sdkp = to_scsi_disk(dev);
335	struct scsi_device *sdp = sdkp->device;
336
337	if (!capable(CAP_SYS_ADMIN))
338	return -EACCES;
339
340	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
341	return -EINVAL;
342
343	if (kstrtobool(s: buf, res: &v))
344	return -EINVAL;
345
346	sdp->allow_restart = v;
347
348	return count;
349	}
350	static DEVICE_ATTR_RW(allow_restart);
351
352	static ssize_t
353	cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
354	{
355	struct scsi_disk *sdkp = to_scsi_disk(dev);
356	int ct = sdkp->RCD + 2*sdkp->WCE;
357
358	return sprintf(buf, fmt: "%s\n", sd_cache_types[ct]);
359	}
360	static DEVICE_ATTR_RW(cache_type);
361
362	static ssize_t
363	FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
364	{
365	struct scsi_disk *sdkp = to_scsi_disk(dev);
366
367	return sprintf(buf, fmt: "%u\n", sdkp->DPOFUA);
368	}
369	static DEVICE_ATTR_RO(FUA);
370
371	static ssize_t
372	protection_type_show(struct device *dev, struct device_attribute *attr,
373	char *buf)
374	{
375	struct scsi_disk *sdkp = to_scsi_disk(dev);
376
377	return sprintf(buf, fmt: "%u\n", sdkp->protection_type);
378	}
379
380	static ssize_t
381	protection_type_store(struct device *dev, struct device_attribute *attr,
382	const char *buf, size_t count)
383	{
384	struct scsi_disk *sdkp = to_scsi_disk(dev);
385	unsigned int val;
386	int err;
387
388	if (!capable(CAP_SYS_ADMIN))
389	return -EACCES;
390
391	err = kstrtouint(s: buf, base: 10, res: &val);
392
393	if (err)
394	return err;
395
396	if (val <= T10_PI_TYPE3_PROTECTION)
397	sdkp->protection_type = val;
398
399	return count;
400	}
401	static DEVICE_ATTR_RW(protection_type);
402
403	static ssize_t
404	protection_mode_show(struct device *dev, struct device_attribute *attr,
405	char *buf)
406	{
407	struct scsi_disk *sdkp = to_scsi_disk(dev);
408	struct scsi_device *sdp = sdkp->device;
409	unsigned int dif, dix;
410
411	dif = scsi_host_dif_capable(shost: sdp->host, target_type: sdkp->protection_type);
412	dix = scsi_host_dix_capable(shost: sdp->host, target_type: sdkp->protection_type);
413
414	if (!dix && scsi_host_dix_capable(shost: sdp->host, target_type: T10_PI_TYPE0_PROTECTION)) {
415	dif = 0;
416	dix = 1;
417	}
418
419	if (!dif && !dix)
420	return sprintf(buf, fmt: "none\n");
421
422	return sprintf(buf, fmt: "%s%u\n", dix ? "dix" : "dif", dif);
423	}
424	static DEVICE_ATTR_RO(protection_mode);
425
426	static ssize_t
427	app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
428	{
429	struct scsi_disk *sdkp = to_scsi_disk(dev);
430
431	return sprintf(buf, fmt: "%u\n", sdkp->ATO);
432	}
433	static DEVICE_ATTR_RO(app_tag_own);
434
435	static ssize_t
436	thin_provisioning_show(struct device *dev, struct device_attribute *attr,
437	char *buf)
438	{
439	struct scsi_disk *sdkp = to_scsi_disk(dev);
440
441	return sprintf(buf, fmt: "%u\n", sdkp->lbpme);
442	}
443	static DEVICE_ATTR_RO(thin_provisioning);
444
445	/* sysfs_match_string() requires dense arrays */
446	static const char *lbp_mode[] = {
447	[SD_LBP_FULL] = "full",
448	[SD_LBP_UNMAP] = "unmap",
449	[SD_LBP_WS16] = "writesame_16",
450	[SD_LBP_WS10] = "writesame_10",
451	[SD_LBP_ZERO] = "writesame_zero",
452	[SD_LBP_DISABLE] = "disabled",
453	};
454
455	static ssize_t
456	provisioning_mode_show(struct device *dev, struct device_attribute *attr,
457	char *buf)
458	{
459	struct scsi_disk *sdkp = to_scsi_disk(dev);
460
461	return sprintf(buf, fmt: "%s\n", lbp_mode[sdkp->provisioning_mode]);
462	}
463
464	static ssize_t
465	provisioning_mode_store(struct device *dev, struct device_attribute *attr,
466	const char *buf, size_t count)
467	{
468	struct scsi_disk *sdkp = to_scsi_disk(dev);
469	struct scsi_device *sdp = sdkp->device;
470	struct queue_limits lim;
471	int mode, err;
472
473	if (!capable(CAP_SYS_ADMIN))
474	return -EACCES;
475
476	if (sdp->type != TYPE_DISK)
477	return -EINVAL;
478
479	mode = sysfs_match_string(lbp_mode, buf);
480	if (mode < 0)
481	return -EINVAL;
482
483	lim = queue_limits_start_update(q: sdkp->disk->queue);
484	sd_config_discard(sdkp, lim: &lim, mode);
485	err = queue_limits_commit_update_frozen(q: sdkp->disk->queue, lim: &lim);
486	if (err)
487	return err;
488	return count;
489	}
490	static DEVICE_ATTR_RW(provisioning_mode);
491
492	/* sysfs_match_string() requires dense arrays */
493	static const char *zeroing_mode[] = {
494	[SD_ZERO_WRITE] = "write",
495	[SD_ZERO_WS] = "writesame",
496	[SD_ZERO_WS16_UNMAP] = "writesame_16_unmap",
497	[SD_ZERO_WS10_UNMAP] = "writesame_10_unmap",
498	};
499
500	static ssize_t
501	zeroing_mode_show(struct device *dev, struct device_attribute *attr,
502	char *buf)
503	{
504	struct scsi_disk *sdkp = to_scsi_disk(dev);
505
506	return sprintf(buf, fmt: "%s\n", zeroing_mode[sdkp->zeroing_mode]);
507	}
508
509	static ssize_t
510	zeroing_mode_store(struct device *dev, struct device_attribute *attr,
511	const char *buf, size_t count)
512	{
513	struct scsi_disk *sdkp = to_scsi_disk(dev);
514	int mode;
515
516	if (!capable(CAP_SYS_ADMIN))
517	return -EACCES;
518
519	mode = sysfs_match_string(zeroing_mode, buf);
520	if (mode < 0)
521	return -EINVAL;
522
523	sdkp->zeroing_mode = mode;
524
525	return count;
526	}
527	static DEVICE_ATTR_RW(zeroing_mode);
528
529	static ssize_t
530	max_medium_access_timeouts_show(struct device *dev,
531	struct device_attribute *attr, char *buf)
532	{
533	struct scsi_disk *sdkp = to_scsi_disk(dev);
534
535	return sprintf(buf, fmt: "%u\n", sdkp->max_medium_access_timeouts);
536	}
537
538	static ssize_t
539	max_medium_access_timeouts_store(struct device *dev,
540	struct device_attribute *attr, const char *buf,
541	size_t count)
542	{
543	struct scsi_disk *sdkp = to_scsi_disk(dev);
544	int err;
545
546	if (!capable(CAP_SYS_ADMIN))
547	return -EACCES;
548
549	err = kstrtouint(s: buf, base: 10, res: &sdkp->max_medium_access_timeouts);
550
551	return err ? err : count;
552	}
553	static DEVICE_ATTR_RW(max_medium_access_timeouts);
554
555	static ssize_t
556	max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
557	char *buf)
558	{
559	struct scsi_disk *sdkp = to_scsi_disk(dev);
560
561	return sprintf(buf, fmt: "%u\n", sdkp->max_ws_blocks);
562	}
563
564	static ssize_t
565	max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
566	const char *buf, size_t count)
567	{
568	struct scsi_disk *sdkp = to_scsi_disk(dev);
569	struct scsi_device *sdp = sdkp->device;
570	struct queue_limits lim;
571	unsigned long max;
572	int err;
573
574	if (!capable(CAP_SYS_ADMIN))
575	return -EACCES;
576
577	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
578	return -EINVAL;
579
580	err = kstrtoul(s: buf, base: 10, res: &max);
581
582	if (err)
583	return err;
584
585	if (max == 0)
586	sdp->no_write_same = 1;
587	else if (max <= SD_MAX_WS16_BLOCKS) {
588	sdp->no_write_same = 0;
589	sdkp->max_ws_blocks = max;
590	}
591
592	lim = queue_limits_start_update(q: sdkp->disk->queue);
593	sd_config_write_same(sdkp, lim: &lim);
594	err = queue_limits_commit_update_frozen(q: sdkp->disk->queue, lim: &lim);
595	if (err)
596	return err;
597	return count;
598	}
599	static DEVICE_ATTR_RW(max_write_same_blocks);
600
601	static ssize_t
602	zoned_cap_show(struct device *dev, struct device_attribute *attr, char *buf)
603	{
604	struct scsi_disk *sdkp = to_scsi_disk(dev);
605
606	if (sdkp->device->type == TYPE_ZBC)
607	return sprintf(buf, fmt: "host-managed\n");
608	if (sdkp->zoned == 1)
609	return sprintf(buf, fmt: "host-aware\n");
610	if (sdkp->zoned == 2)
611	return sprintf(buf, fmt: "drive-managed\n");
612	return sprintf(buf, fmt: "none\n");
613	}
614	static DEVICE_ATTR_RO(zoned_cap);
615
616	static ssize_t
617	max_retries_store(struct device *dev, struct device_attribute *attr,
618	const char *buf, size_t count)
619	{
620	struct scsi_disk *sdkp = to_scsi_disk(dev);
621	struct scsi_device *sdev = sdkp->device;
622	int retries, err;
623
624	err = kstrtoint(s: buf, base: 10, res: &retries);
625	if (err)
626	return err;
627
628	if (retries == SCSI_CMD_RETRIES_NO_LIMIT || retries <= SD_MAX_RETRIES) {
629	sdkp->max_retries = retries;
630	return count;
631	}
632
633	sdev_printk(KERN_ERR, sdev, "max_retries must be between -1 and %d\n",
634	SD_MAX_RETRIES);
635	return -EINVAL;
636	}
637
638	static ssize_t
639	max_retries_show(struct device *dev, struct device_attribute *attr,
640	char *buf)
641	{
642	struct scsi_disk *sdkp = to_scsi_disk(dev);
643
644	return sprintf(buf, fmt: "%d\n", sdkp->max_retries);
645	}
646
647	static DEVICE_ATTR_RW(max_retries);
648
649	static struct attribute *sd_disk_attrs[] = {
650	&dev_attr_cache_type.attr,
651	&dev_attr_FUA.attr,
652	&dev_attr_allow_restart.attr,
653	&dev_attr_manage_start_stop.attr,
654	&dev_attr_manage_system_start_stop.attr,
655	&dev_attr_manage_runtime_start_stop.attr,
656	&dev_attr_manage_shutdown.attr,
657	&dev_attr_protection_type.attr,
658	&dev_attr_protection_mode.attr,
659	&dev_attr_app_tag_own.attr,
660	&dev_attr_thin_provisioning.attr,
661	&dev_attr_provisioning_mode.attr,
662	&dev_attr_zeroing_mode.attr,
663	&dev_attr_max_write_same_blocks.attr,
664	&dev_attr_max_medium_access_timeouts.attr,
665	&dev_attr_zoned_cap.attr,
666	&dev_attr_max_retries.attr,
667	NULL,
668	};
669	ATTRIBUTE_GROUPS(sd_disk);
670
671	static struct class sd_disk_class = {
672	.name = "scsi_disk",
673	.dev_release = scsi_disk_release,
674	.dev_groups = sd_disk_groups,
675	};
676
677	/*
678	* Don't request a new module, as that could deadlock in multipath
679	* environment.
680	*/
681	static void sd_default_probe(dev_t devt)
682	{
683	}
684
685	/*
686	* Device no to disk mapping:
687	*
688	* major disc2 disc p1
689	* |............|.............|....|....| <- dev_t
690	* 31 20 19 8 7 4 3 0
691	*
692	* Inside a major, we have 16k disks, however mapped non-
693	* contiguously. The first 16 disks are for major0, the next
694	* ones with major1, ... Disk 256 is for major0 again, disk 272
695	* for major1, ...
696	* As we stay compatible with our numbering scheme, we can reuse
697	* the well-know SCSI majors 8, 65--71, 136--143.
698	*/
699	static int sd_major(int major_idx)
700	{
701	switch (major_idx) {
702	case 0:
703	return SCSI_DISK0_MAJOR;
704	case 1 ... 7:
705	return SCSI_DISK1_MAJOR + major_idx - 1;
706	case 8 ... 15:
707	return SCSI_DISK8_MAJOR + major_idx - 8;
708	default:
709	BUG();
710	return 0; /* shut up gcc */
711	}
712	}
713
714	#ifdef CONFIG_BLK_SED_OPAL
715	static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
716	size_t len, bool send)
717	{
718	struct scsi_disk *sdkp = data;
719	struct scsi_device *sdev = sdkp->device;
720	u8 cdb[12] = { 0, };
721	const struct scsi_exec_args exec_args = {
722	.req_flags = BLK_MQ_REQ_PM,
723	};
724	int ret;
725
726	cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
727	cdb[1] = secp;
728	put_unaligned_be16(val: spsp, p: &cdb[2]);
729	put_unaligned_be32(val: len, p: &cdb[6]);
730
731	ret = scsi_execute_cmd(sdev, cmd: cdb, opf: send ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
732	buffer, bufflen: len, SD_TIMEOUT, retries: sdkp->max_retries,
733	args: &exec_args);
734	return ret <= 0 ? ret : -EIO;
735	}
736	#endif /* CONFIG_BLK_SED_OPAL */
737
738	/*
739	* Look up the DIX operation based on whether the command is read or
740	* write and whether dix and dif are enabled.
741	*/
742	static unsigned int sd_prot_op(bool write, bool dix, bool dif)
743	{
744	/* Lookup table: bit 2 (write), bit 1 (dix), bit 0 (dif) */
745	static const unsigned int ops[] = { /* wrt dix dif */
746	SCSI_PROT_NORMAL, /* 0 0 0 */
747	SCSI_PROT_READ_STRIP, /* 0 0 1 */
748	SCSI_PROT_READ_INSERT, /* 0 1 0 */
749	SCSI_PROT_READ_PASS, /* 0 1 1 */
750	SCSI_PROT_NORMAL, /* 1 0 0 */
751	SCSI_PROT_WRITE_INSERT, /* 1 0 1 */
752	SCSI_PROT_WRITE_STRIP, /* 1 1 0 */
753	SCSI_PROT_WRITE_PASS, /* 1 1 1 */
754	};
755
756	return ops[write << 2 | dix << 1 | dif];
757	}
758
759	/*
760	* Returns a mask of the protection flags that are valid for a given DIX
761	* operation.
762	*/
763	static unsigned int sd_prot_flag_mask(unsigned int prot_op)
764	{
765	static const unsigned int flag_mask[] = {
766	[SCSI_PROT_NORMAL] = 0,
767
768	[SCSI_PROT_READ_STRIP] = SCSI_PROT_TRANSFER_PI |
769	SCSI_PROT_GUARD_CHECK |
770	SCSI_PROT_REF_CHECK |
771	SCSI_PROT_REF_INCREMENT,
772
773	[SCSI_PROT_READ_INSERT] = SCSI_PROT_REF_INCREMENT |
774	SCSI_PROT_IP_CHECKSUM,
775
776	[SCSI_PROT_READ_PASS] = SCSI_PROT_TRANSFER_PI |
777	SCSI_PROT_GUARD_CHECK |
778	SCSI_PROT_REF_CHECK |
779	SCSI_PROT_REF_INCREMENT |
780	SCSI_PROT_IP_CHECKSUM,
781
782	[SCSI_PROT_WRITE_INSERT] = SCSI_PROT_TRANSFER_PI |
783	SCSI_PROT_REF_INCREMENT,
784
785	[SCSI_PROT_WRITE_STRIP] = SCSI_PROT_GUARD_CHECK |
786	SCSI_PROT_REF_CHECK |
787	SCSI_PROT_REF_INCREMENT |
788	SCSI_PROT_IP_CHECKSUM,
789
790	[SCSI_PROT_WRITE_PASS] = SCSI_PROT_TRANSFER_PI |
791	SCSI_PROT_GUARD_CHECK |
792	SCSI_PROT_REF_CHECK |
793	SCSI_PROT_REF_INCREMENT |
794	SCSI_PROT_IP_CHECKSUM,
795	};
796
797	return flag_mask[prot_op];
798	}
799
800	static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
801	unsigned int dix, unsigned int dif)
802	{
803	struct request *rq = scsi_cmd_to_rq(scmd);
804	struct bio *bio = rq->bio;
805	unsigned int prot_op = sd_prot_op(rq_data_dir(rq), dix, dif);
806	unsigned int protect = 0;
807
808	if (dix) { /* DIX Type 0, 1, 2, 3 */
809	if (bio_integrity_flagged(bio, flag: BIP_IP_CHECKSUM))
810	scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
811
812	if (bio_integrity_flagged(bio, flag: BIP_CHECK_GUARD))
813	scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
814	}
815
816	if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
817	scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
818
819	if (bio_integrity_flagged(bio, flag: BIP_CHECK_REFTAG))
820	scmd->prot_flags |= SCSI_PROT_REF_CHECK;
821	}
822
823	if (dif) { /* DIX/DIF Type 1, 2, 3 */
824	scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
825
826	if (bio_integrity_flagged(bio, flag: BIP_DISK_NOCHECK))
827	protect = 3 << 5; /* Disable target PI checking */
828	else
829	protect = 1 << 5; /* Enable target PI checking */
830	}
831
832	scsi_set_prot_op(scmd, op: prot_op);
833	scsi_set_prot_type(scmd, type: dif);
834	scmd->prot_flags &= sd_prot_flag_mask(prot_op);
835
836	return protect;
837	}
838
839	static void sd_disable_discard(struct scsi_disk *sdkp)
840	{
841	sdkp->provisioning_mode = SD_LBP_DISABLE;
842	blk_queue_disable_discard(q: sdkp->disk->queue);
843	}
844
845	static void sd_config_discard(struct scsi_disk *sdkp, struct queue_limits *lim,
846	unsigned int mode)
847	{
848	unsigned int logical_block_size = sdkp->device->sector_size;
849	unsigned int max_blocks = 0;
850
851	lim->discard_alignment = sdkp->unmap_alignment * logical_block_size;
852	lim->discard_granularity = max(sdkp->physical_block_size,
853	sdkp->unmap_granularity * logical_block_size);
854	sdkp->provisioning_mode = mode;
855
856	switch (mode) {
857
858	case SD_LBP_FULL:
859	case SD_LBP_DISABLE:
860	break;
861
862	case SD_LBP_UNMAP:
863	max_blocks = min_not_zero(sdkp->max_unmap_blocks,
864	(u32)SD_MAX_WS16_BLOCKS);
865	break;
866
867	case SD_LBP_WS16:
868	if (sdkp->device->unmap_limit_for_ws)
869	max_blocks = sdkp->max_unmap_blocks;
870	else
871	max_blocks = sdkp->max_ws_blocks;
872
873	max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
874	break;
875
876	case SD_LBP_WS10:
877	if (sdkp->device->unmap_limit_for_ws)
878	max_blocks = sdkp->max_unmap_blocks;
879	else
880	max_blocks = sdkp->max_ws_blocks;
881
882	max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
883	break;
884
885	case SD_LBP_ZERO:
886	max_blocks = min_not_zero(sdkp->max_ws_blocks,
887	(u32)SD_MAX_WS10_BLOCKS);
888	break;
889	}
890
891	lim->max_hw_discard_sectors = max_blocks *
892	(logical_block_size >> SECTOR_SHIFT);
893	}
894
895	static void *sd_set_special_bvec(struct request *rq, unsigned int data_len)
896	{
897	struct page *page;
898
899	page = mempool_alloc(sd_page_pool, GFP_ATOMIC);
900	if (!page)
901	return NULL;
902	clear_highpage(page);
903	bvec_set_page(bv: &rq->special_vec, page, len: data_len, offset: 0);
904	rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
905	return bvec_virt(bvec: &rq->special_vec);
906	}
907
908	static blk_status_t sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
909	{
910	struct scsi_device *sdp = cmd->device;
911	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
912	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
913	u64 lba = sectors_to_logical(sdev: sdp, sector: blk_rq_pos(rq));
914	u32 nr_blocks = sectors_to_logical(sdev: sdp, sector: blk_rq_sectors(rq));
915	unsigned int data_len = 24;
916	char *buf;
917
918	buf = sd_set_special_bvec(rq, data_len);
919	if (!buf)
920	return BLK_STS_RESOURCE;
921
922	cmd->cmd_len = 10;
923	cmd->cmnd[0] = UNMAP;
924	cmd->cmnd[8] = 24;
925
926	put_unaligned_be16(val: 6 + 16, p: &buf[0]);
927	put_unaligned_be16(val: 16, p: &buf[2]);
928	put_unaligned_be64(val: lba, p: &buf[8]);
929	put_unaligned_be32(val: nr_blocks, p: &buf[16]);
930
931	cmd->allowed = sdkp->max_retries;
932	cmd->transfersize = data_len;
933	rq->timeout = SD_TIMEOUT;
934
935	return scsi_alloc_sgtables(cmd);
936	}
937
938	static void sd_config_atomic(struct scsi_disk *sdkp, struct queue_limits *lim)
939	{
940	unsigned int logical_block_size = sdkp->device->sector_size,
941	physical_block_size_sectors, max_atomic, unit_min, unit_max;
942
943	if ((!sdkp->max_atomic && !sdkp->max_atomic_with_boundary) ||
944	sdkp->protection_type == T10_PI_TYPE2_PROTECTION)
945	return;
946
947	physical_block_size_sectors = sdkp->physical_block_size /
948	sdkp->device->sector_size;
949
950	unit_min = rounddown_pow_of_two(sdkp->atomic_granularity ?
951	sdkp->atomic_granularity :
952	physical_block_size_sectors);
953
954	/*
955	* Only use atomic boundary when we have the odd scenario of
956	* sdkp->max_atomic == 0, which the spec does permit.
957	*/
958	if (sdkp->max_atomic) {
959	max_atomic = sdkp->max_atomic;
960	unit_max = rounddown_pow_of_two(sdkp->max_atomic);
961	sdkp->use_atomic_write_boundary = 0;
962	} else {
963	max_atomic = sdkp->max_atomic_with_boundary;
964	unit_max = rounddown_pow_of_two(sdkp->max_atomic_boundary);
965	sdkp->use_atomic_write_boundary = 1;
966	}
967
968	/*
969	* Ensure compliance with granularity and alignment. For now, keep it
970	* simple and just don't support atomic writes for values mismatched
971	* with max_{boundary}atomic, physical block size, and
972	* atomic_granularity itself.
973	*
974	* We're really being distrustful by checking unit_max also...
975	*/
976	if (sdkp->atomic_granularity > 1) {
977	if (unit_min > 1 && unit_min % sdkp->atomic_granularity)
978	return;
979	if (unit_max > 1 && unit_max % sdkp->atomic_granularity)
980	return;
981	}
982
983	if (sdkp->atomic_alignment > 1) {
984	if (unit_min > 1 && unit_min % sdkp->atomic_alignment)
985	return;
986	if (unit_max > 1 && unit_max % sdkp->atomic_alignment)
987	return;
988	}
989
990	lim->atomic_write_hw_max = max_atomic * logical_block_size;
991	lim->atomic_write_hw_boundary = 0;
992	lim->atomic_write_hw_unit_min = unit_min * logical_block_size;
993	lim->atomic_write_hw_unit_max = unit_max * logical_block_size;
994	lim->features |= BLK_FEAT_ATOMIC_WRITES;
995	}
996
997	static blk_status_t sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd,
998	bool unmap)
999	{
1000	struct scsi_device *sdp = cmd->device;
1001	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1002	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1003	u64 lba = sectors_to_logical(sdev: sdp, sector: blk_rq_pos(rq));
1004	u32 nr_blocks = sectors_to_logical(sdev: sdp, sector: blk_rq_sectors(rq));
1005	u32 data_len = sdp->sector_size;
1006
1007	if (!sd_set_special_bvec(rq, data_len))
1008	return BLK_STS_RESOURCE;
1009
1010	cmd->cmd_len = 16;
1011	cmd->cmnd[0] = WRITE_SAME_16;
1012	if (unmap)
1013	cmd->cmnd[1] = 0x8; /* UNMAP */
1014	put_unaligned_be64(val: lba, p: &cmd->cmnd[2]);
1015	put_unaligned_be32(val: nr_blocks, p: &cmd->cmnd[10]);
1016
1017	cmd->allowed = sdkp->max_retries;
1018	cmd->transfersize = data_len;
1019	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1020
1021	return scsi_alloc_sgtables(cmd);
1022	}
1023
1024	static blk_status_t sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd,
1025	bool unmap)
1026	{
1027	struct scsi_device *sdp = cmd->device;
1028	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1029	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1030	u64 lba = sectors_to_logical(sdev: sdp, sector: blk_rq_pos(rq));
1031	u32 nr_blocks = sectors_to_logical(sdev: sdp, sector: blk_rq_sectors(rq));
1032	u32 data_len = sdp->sector_size;
1033
1034	if (!sd_set_special_bvec(rq, data_len))
1035	return BLK_STS_RESOURCE;
1036
1037	cmd->cmd_len = 10;
1038	cmd->cmnd[0] = WRITE_SAME;
1039	if (unmap)
1040	cmd->cmnd[1] = 0x8; /* UNMAP */
1041	put_unaligned_be32(val: lba, p: &cmd->cmnd[2]);
1042	put_unaligned_be16(val: nr_blocks, p: &cmd->cmnd[7]);
1043
1044	cmd->allowed = sdkp->max_retries;
1045	cmd->transfersize = data_len;
1046	rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
1047
1048	return scsi_alloc_sgtables(cmd);
1049	}
1050
1051	static blk_status_t sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
1052	{
1053	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1054	struct scsi_device *sdp = cmd->device;
1055	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1056	u64 lba = sectors_to_logical(sdev: sdp, sector: blk_rq_pos(rq));
1057	u32 nr_blocks = sectors_to_logical(sdev: sdp, sector: blk_rq_sectors(rq));
1058
1059	if (!(rq->cmd_flags & REQ_NOUNMAP)) {
1060	switch (sdkp->zeroing_mode) {
1061	case SD_ZERO_WS16_UNMAP:
1062	return sd_setup_write_same16_cmnd(cmd, unmap: true);
1063	case SD_ZERO_WS10_UNMAP:
1064	return sd_setup_write_same10_cmnd(cmd, unmap: true);
1065	}
1066	}
1067
1068	if (sdp->no_write_same) {
1069	rq->rq_flags |= RQF_QUIET;
1070	return BLK_STS_TARGET;
1071	}
1072
1073	if (sdkp->ws16 || lba > 0xffffffff || nr_blocks > 0xffff)
1074	return sd_setup_write_same16_cmnd(cmd, unmap: false);
1075
1076	return sd_setup_write_same10_cmnd(cmd, unmap: false);
1077	}
1078
1079	static void sd_disable_write_same(struct scsi_disk *sdkp)
1080	{
1081	sdkp->device->no_write_same = 1;
1082	sdkp->max_ws_blocks = 0;
1083	blk_queue_disable_write_zeroes(q: sdkp->disk->queue);
1084	}
1085
1086	static void sd_config_write_same(struct scsi_disk *sdkp,
1087	struct queue_limits *lim)
1088	{
1089	unsigned int logical_block_size = sdkp->device->sector_size;
1090
1091	if (sdkp->device->no_write_same) {
1092	sdkp->max_ws_blocks = 0;
1093	goto out;
1094	}
1095
1096	/* Some devices can not handle block counts above 0xffff despite
1097	* supporting WRITE SAME(16). Consequently we default to 64k
1098	* blocks per I/O unless the device explicitly advertises a
1099	* bigger limit.
1100	*/
1101	if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
1102	sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1103	(u32)SD_MAX_WS16_BLOCKS);
1104	else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
1105	sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
1106	(u32)SD_MAX_WS10_BLOCKS);
1107	else {
1108	sdkp->device->no_write_same = 1;
1109	sdkp->max_ws_blocks = 0;
1110	}
1111
1112	if (sdkp->lbprz && sdkp->lbpws)
1113	sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
1114	else if (sdkp->lbprz && sdkp->lbpws10)
1115	sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
1116	else if (sdkp->max_ws_blocks)
1117	sdkp->zeroing_mode = SD_ZERO_WS;
1118	else
1119	sdkp->zeroing_mode = SD_ZERO_WRITE;
1120
1121	if (sdkp->max_ws_blocks &&
1122	sdkp->physical_block_size > logical_block_size) {
1123	/*
1124	* Reporting a maximum number of blocks that is not aligned
1125	* on the device physical size would cause a large write same
1126	* request to be split into physically unaligned chunks by
1127	* __blkdev_issue_write_zeroes() even if the caller of this
1128	* functions took care to align the large request. So make sure
1129	* the maximum reported is aligned to the device physical block
1130	* size. This is only an optional optimization for regular
1131	* disks, but this is mandatory to avoid failure of large write
1132	* same requests directed at sequential write required zones of
1133	* host-managed ZBC disks.
1134	*/
1135	sdkp->max_ws_blocks =
1136	round_down(sdkp->max_ws_blocks,
1137	bytes_to_logical(sdkp->device,
1138	sdkp->physical_block_size));
1139	}
1140
1141	out:
1142	lim->max_write_zeroes_sectors =
1143	sdkp->max_ws_blocks * (logical_block_size >> SECTOR_SHIFT);
1144	}
1145
1146	static blk_status_t sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
1147	{
1148	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1149	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1150
1151	/* flush requests don't perform I/O, zero the S/G table */
1152	memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1153
1154	if (cmd->device->use_16_for_sync) {
1155	cmd->cmnd[0] = SYNCHRONIZE_CACHE_16;
1156	cmd->cmd_len = 16;
1157	} else {
1158	cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1159	cmd->cmd_len = 10;
1160	}
1161	cmd->transfersize = 0;
1162	cmd->allowed = sdkp->max_retries;
1163
1164	rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1165	return BLK_STS_OK;
1166	}
1167
1168	/**
1169	* sd_group_number() - Compute the GROUP NUMBER field
1170	* @cmd: SCSI command for which to compute the value of the six-bit GROUP NUMBER
1171	* field.
1172	*
1173	* From SBC-5 r05 (https://www.t10.org/cgi-bin/ac.pl?t=f&f=sbc5r05.pdf):
1174	* 0: no relative lifetime.
1175	* 1: shortest relative lifetime.
1176	* 2: second shortest relative lifetime.
1177	* 3 - 0x3d: intermediate relative lifetimes.
1178	* 0x3e: second longest relative lifetime.
1179	* 0x3f: longest relative lifetime.
1180	*/
1181	static u8 sd_group_number(struct scsi_cmnd *cmd)
1182	{
1183	const struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1184	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1185
1186	if (!sdkp->rscs)
1187	return 0;
1188
1189	return min3((u32)rq->bio->bi_write_hint,
1190	(u32)sdkp->permanent_stream_count, 0x3fu);
1191	}
1192
1193	static blk_status_t sd_setup_rw32_cmnd(struct scsi_cmnd *cmd, bool write,
1194	sector_t lba, unsigned int nr_blocks,
1195	unsigned char flags, unsigned int dld)
1196	{
1197	cmd->cmd_len = SD_EXT_CDB_SIZE;
1198	cmd->cmnd[0] = VARIABLE_LENGTH_CMD;
1199	cmd->cmnd[6] = sd_group_number(cmd);
1200	cmd->cmnd[7] = 0x18; /* Additional CDB len */
1201	cmd->cmnd[9] = write ? WRITE_32 : READ_32;
1202	cmd->cmnd[10] = flags;
1203	cmd->cmnd[11] = dld & 0x07;
1204	put_unaligned_be64(val: lba, p: &cmd->cmnd[12]);
1205	put_unaligned_be32(val: lba, p: &cmd->cmnd[20]); /* Expected Indirect LBA */
1206	put_unaligned_be32(val: nr_blocks, p: &cmd->cmnd[28]);
1207
1208	return BLK_STS_OK;
1209	}
1210
1211	static blk_status_t sd_setup_rw16_cmnd(struct scsi_cmnd *cmd, bool write,
1212	sector_t lba, unsigned int nr_blocks,
1213	unsigned char flags, unsigned int dld)
1214	{
1215	cmd->cmd_len = 16;
1216	cmd->cmnd[0] = write ? WRITE_16 : READ_16;
1217	cmd->cmnd[1] = flags | ((dld >> 2) & 0x01);
1218	cmd->cmnd[14] = ((dld & 0x03) << 6) | sd_group_number(cmd);
1219	cmd->cmnd[15] = 0;
1220	put_unaligned_be64(val: lba, p: &cmd->cmnd[2]);
1221	put_unaligned_be32(val: nr_blocks, p: &cmd->cmnd[10]);
1222
1223	return BLK_STS_OK;
1224	}
1225
1226	static blk_status_t sd_setup_rw10_cmnd(struct scsi_cmnd *cmd, bool write,
1227	sector_t lba, unsigned int nr_blocks,
1228	unsigned char flags)
1229	{
1230	cmd->cmd_len = 10;
1231	cmd->cmnd[0] = write ? WRITE_10 : READ_10;
1232	cmd->cmnd[1] = flags;
1233	cmd->cmnd[6] = sd_group_number(cmd);
1234	cmd->cmnd[9] = 0;
1235	put_unaligned_be32(val: lba, p: &cmd->cmnd[2]);
1236	put_unaligned_be16(val: nr_blocks, p: &cmd->cmnd[7]);
1237
1238	return BLK_STS_OK;
1239	}
1240
1241	static blk_status_t sd_setup_rw6_cmnd(struct scsi_cmnd *cmd, bool write,
1242	sector_t lba, unsigned int nr_blocks,
1243	unsigned char flags)
1244	{
1245	/* Avoid that 0 blocks gets translated into 256 blocks. */
1246	if (WARN_ON_ONCE(nr_blocks == 0))
1247	return BLK_STS_IOERR;
1248
1249	if (unlikely(flags & 0x8)) {
1250	/*
1251	* This happens only if this drive failed 10byte rw
1252	* command with ILLEGAL_REQUEST during operation and
1253	* thus turned off use_10_for_rw.
1254	*/
1255	scmd_printk(KERN_ERR, cmd, "FUA write on READ/WRITE(6) drive\n");
1256	return BLK_STS_IOERR;
1257	}
1258
1259	cmd->cmd_len = 6;
1260	cmd->cmnd[0] = write ? WRITE_6 : READ_6;
1261	cmd->cmnd[1] = (lba >> 16) & 0x1f;
1262	cmd->cmnd[2] = (lba >> 8) & 0xff;
1263	cmd->cmnd[3] = lba & 0xff;
1264	cmd->cmnd[4] = nr_blocks;
1265	cmd->cmnd[5] = 0;
1266
1267	return BLK_STS_OK;
1268	}
1269
1270	/*
1271	* Check if a command has a duration limit set. If it does, and the target
1272	* device supports CDL and the feature is enabled, return the limit
1273	* descriptor index to use. Return 0 (no limit) otherwise.
1274	*/
1275	static int sd_cdl_dld(struct scsi_disk *sdkp, struct scsi_cmnd *scmd)
1276	{
1277	struct scsi_device *sdp = sdkp->device;
1278	int hint;
1279
1280	if (!sdp->cdl_supported || !sdp->cdl_enable)
1281	return 0;
1282
1283	/*
1284	* Use "no limit" if the request ioprio does not specify a duration
1285	* limit hint.
1286	*/
1287	hint = IOPRIO_PRIO_HINT(req_get_ioprio(scsi_cmd_to_rq(scmd)));
1288	if (hint < IOPRIO_HINT_DEV_DURATION_LIMIT_1 ||
1289	hint > IOPRIO_HINT_DEV_DURATION_LIMIT_7)
1290	return 0;
1291
1292	return (hint - IOPRIO_HINT_DEV_DURATION_LIMIT_1) + 1;
1293	}
1294
1295	static blk_status_t sd_setup_atomic_cmnd(struct scsi_cmnd *cmd,
1296	sector_t lba, unsigned int nr_blocks,
1297	bool boundary, unsigned char flags)
1298	{
1299	cmd->cmd_len = 16;
1300	cmd->cmnd[0] = WRITE_ATOMIC_16;
1301	cmd->cmnd[1] = flags;
1302	put_unaligned_be64(val: lba, p: &cmd->cmnd[2]);
1303	put_unaligned_be16(val: nr_blocks, p: &cmd->cmnd[12]);
1304	if (boundary)
1305	put_unaligned_be16(val: nr_blocks, p: &cmd->cmnd[10]);
1306	else
1307	put_unaligned_be16(val: 0, p: &cmd->cmnd[10]);
1308	put_unaligned_be16(val: nr_blocks, p: &cmd->cmnd[12]);
1309	cmd->cmnd[14] = 0;
1310	cmd->cmnd[15] = 0;
1311
1312	return BLK_STS_OK;
1313	}
1314
1315	static blk_status_t sd_setup_read_write_cmnd(struct scsi_cmnd *cmd)
1316	{
1317	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1318	struct scsi_device *sdp = cmd->device;
1319	struct scsi_disk *sdkp = scsi_disk(disk: rq->q->disk);
1320	sector_t lba = sectors_to_logical(sdev: sdp, sector: blk_rq_pos(rq));
1321	sector_t threshold;
1322	unsigned int nr_blocks = sectors_to_logical(sdev: sdp, sector: blk_rq_sectors(rq));
1323	unsigned int mask = logical_to_sectors(sdev: sdp, blocks: 1) - 1;
1324	bool write = rq_data_dir(rq) == WRITE;
1325	unsigned char protect, fua;
1326	unsigned int dld;
1327	blk_status_t ret;
1328	unsigned int dif;
1329	bool dix;
1330
1331	ret = scsi_alloc_sgtables(cmd);
1332	if (ret != BLK_STS_OK)
1333	return ret;
1334
1335	ret = BLK_STS_IOERR;
1336	if (!scsi_device_online(sdev: sdp) || sdp->changed) {
1337	scmd_printk(KERN_ERR, cmd, "device offline or changed\n");
1338	goto fail;
1339	}
1340
1341	if (blk_rq_pos(rq) + blk_rq_sectors(rq) > get_capacity(disk: rq->q->disk)) {
1342	scmd_printk(KERN_ERR, cmd, "access beyond end of device\n");
1343	goto fail;
1344	}
1345
1346	if ((blk_rq_pos(rq) & mask) || (blk_rq_sectors(rq) & mask)) {
1347	scmd_printk(KERN_ERR, cmd, "request not aligned to the logical block size\n");
1348	goto fail;
1349	}
1350
1351	/*
1352	* Some SD card readers can't handle accesses which touch the
1353	* last one or two logical blocks. Split accesses as needed.
1354	*/
1355	threshold = sdkp->capacity - SD_LAST_BUGGY_SECTORS;
1356
1357	if (unlikely(sdp->last_sector_bug && lba + nr_blocks > threshold)) {
1358	if (lba < threshold) {
1359	/* Access up to the threshold but not beyond */
1360	nr_blocks = threshold - lba;
1361	} else {
1362	/* Access only a single logical block */
1363	nr_blocks = 1;
1364	}
1365	}
1366
1367	fua = rq->cmd_flags & REQ_FUA ? 0x8 : 0;
1368	dix = scsi_prot_sg_count(cmd);
1369	dif = scsi_host_dif_capable(shost: cmd->device->host, target_type: sdkp->protection_type);
1370	dld = sd_cdl_dld(sdkp, scmd: cmd);
1371
1372	if (dif || dix)
1373	protect = sd_setup_protect_cmnd(scmd: cmd, dix, dif);
1374	else
1375	protect = 0;
1376
1377	if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1378	ret = sd_setup_rw32_cmnd(cmd, write, lba, nr_blocks,
1379	flags: protect | fua, dld);
1380	} else if (rq->cmd_flags & REQ_ATOMIC) {
1381	ret = sd_setup_atomic_cmnd(cmd, lba, nr_blocks,
1382	boundary: sdkp->use_atomic_write_boundary,
1383	flags: protect | fua);
1384	} else if (sdp->use_16_for_rw || (nr_blocks > 0xffff)) {
1385	ret = sd_setup_rw16_cmnd(cmd, write, lba, nr_blocks,
1386	flags: protect | fua, dld);
1387	} else if ((nr_blocks > 0xff) || (lba > 0x1fffff) ||
1388	sdp->use_10_for_rw || protect || rq->bio->bi_write_hint) {
1389	ret = sd_setup_rw10_cmnd(cmd, write, lba, nr_blocks,
1390	flags: protect | fua);
1391	} else {
1392	ret = sd_setup_rw6_cmnd(cmd, write, lba, nr_blocks,
1393	flags: protect | fua);
1394	}
1395
1396	if (unlikely(ret != BLK_STS_OK))
1397	goto fail;
1398
1399	/*
1400	* We shouldn't disconnect in the middle of a sector, so with a dumb
1401	* host adapter, it's safe to assume that we can at least transfer
1402	* this many bytes between each connect / disconnect.
1403	*/
1404	cmd->transfersize = sdp->sector_size;
1405	cmd->underflow = nr_blocks << 9;
1406	cmd->allowed = sdkp->max_retries;
1407	cmd->sdb.length = nr_blocks * sdp->sector_size;
1408
1409	SCSI_LOG_HLQUEUE(1,
1410	scmd_printk(KERN_INFO, cmd,
1411	"%s: block=%llu, count=%d\n", __func__,
1412	(unsigned long long)blk_rq_pos(rq),
1413	blk_rq_sectors(rq)));
1414	SCSI_LOG_HLQUEUE(2,
1415	scmd_printk(KERN_INFO, cmd,
1416	"%s %d/%u 512 byte blocks.\n",
1417	write ? "writing" : "reading", nr_blocks,
1418	blk_rq_sectors(rq)));
1419
1420	/*
1421	* This indicates that the command is ready from our end to be queued.
1422	*/
1423	return BLK_STS_OK;
1424	fail:
1425	scsi_free_sgtables(cmd);
1426	return ret;
1427	}
1428
1429	static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
1430	{
1431	struct request *rq = scsi_cmd_to_rq(scmd: cmd);
1432
1433	switch (req_op(req: rq)) {
1434	case REQ_OP_DISCARD:
1435	switch (scsi_disk(disk: rq->q->disk)->provisioning_mode) {
1436	case SD_LBP_UNMAP:
1437	return sd_setup_unmap_cmnd(cmd);
1438	case SD_LBP_WS16:
1439	return sd_setup_write_same16_cmnd(cmd, unmap: true);
1440	case SD_LBP_WS10:
1441	return sd_setup_write_same10_cmnd(cmd, unmap: true);
1442	case SD_LBP_ZERO:
1443	return sd_setup_write_same10_cmnd(cmd, unmap: false);
1444	default:
1445	return BLK_STS_TARGET;
1446	}
1447	case REQ_OP_WRITE_ZEROES:
1448	return sd_setup_write_zeroes_cmnd(cmd);
1449	case REQ_OP_FLUSH:
1450	return sd_setup_flush_cmnd(cmd);
1451	case REQ_OP_READ:
1452	case REQ_OP_WRITE:
1453	return sd_setup_read_write_cmnd(cmd);
1454	case REQ_OP_ZONE_RESET:
1455	return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1456	all: false);
1457	case REQ_OP_ZONE_RESET_ALL:
1458	return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
1459	all: true);
1460	case REQ_OP_ZONE_OPEN:
1461	return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, all: false);
1462	case REQ_OP_ZONE_CLOSE:
1463	return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, all: false);
1464	case REQ_OP_ZONE_FINISH:
1465	return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, all: false);
1466	default:
1467	WARN_ON_ONCE(1);
1468	return BLK_STS_NOTSUPP;
1469	}
1470	}
1471
1472	static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1473	{
1474	struct request *rq = scsi_cmd_to_rq(scmd: SCpnt);
1475
1476	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1477	mempool_free(element: rq->special_vec.bv_page, pool: sd_page_pool);
1478	}
1479
1480	static bool sd_need_revalidate(struct gendisk *disk, struct scsi_disk *sdkp)
1481	{
1482	if (sdkp->device->removable || sdkp->write_prot) {
1483	if (disk_check_media_change(disk))
1484	return true;
1485	}
1486
1487	/*
1488	* Force a full rescan after ioctl(BLKRRPART). While the disk state has
1489	* nothing to do with partitions, BLKRRPART is used to force a full
1490	* revalidate after things like a format for historical reasons.
1491	*/
1492	return test_bit(GD_NEED_PART_SCAN, &disk->state);
1493	}
1494
1495	/**
1496	* sd_open - open a scsi disk device
1497	* @disk: disk to open
1498	* @mode: open mode
1499	*
1500	* Returns 0 if successful. Returns a negated errno value in case
1501	* of error.
1502	*
1503	* Note: This can be called from a user context (e.g. fsck(1) )
1504	* or from within the kernel (e.g. as a result of a mount(1) ).
1505	* In the latter case @inode and @filp carry an abridged amount
1506	* of information as noted above.
1507	*
1508	* Locking: called with disk->open_mutex held.
1509	**/
1510	static int sd_open(struct gendisk *disk, blk_mode_t mode)
1511	{
1512	struct scsi_disk *sdkp = scsi_disk(disk);
1513	struct scsi_device *sdev = sdkp->device;
1514	int retval;
1515
1516	if (scsi_device_get(sdev))
1517	return -ENXIO;
1518
1519	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1520
1521	/*
1522	* If the device is in error recovery, wait until it is done.
1523	* If the device is offline, then disallow any access to it.
1524	*/
1525	retval = -ENXIO;
1526	if (!scsi_block_when_processing_errors(sdev))
1527	goto error_out;
1528
1529	if (sd_need_revalidate(disk, sdkp))
1530	sd_revalidate_disk(disk);
1531
1532	/*
1533	* If the drive is empty, just let the open fail.
1534	*/
1535	retval = -ENOMEDIUM;
1536	if (sdev->removable && !sdkp->media_present &&
1537	!(mode & BLK_OPEN_NDELAY))
1538	goto error_out;
1539
1540	/*
1541	* If the device has the write protect tab set, have the open fail
1542	* if the user expects to be able to write to the thing.
1543	*/
1544	retval = -EROFS;
1545	if (sdkp->write_prot && (mode & BLK_OPEN_WRITE))
1546	goto error_out;
1547
1548	/*
1549	* It is possible that the disk changing stuff resulted in
1550	* the device being taken offline. If this is the case,
1551	* report this to the user, and don't pretend that the
1552	* open actually succeeded.
1553	*/
1554	retval = -ENXIO;
1555	if (!scsi_device_online(sdev))
1556	goto error_out;
1557
1558	if ((atomic_inc_return(v: &sdkp->openers) == 1) && sdev->removable) {
1559	if (scsi_block_when_processing_errors(sdev))
1560	scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1561	}
1562
1563	return 0;
1564
1565	error_out:
1566	scsi_device_put(sdev);
1567	return retval;
1568	}
1569
1570	/**
1571	* sd_release - invoked when the (last) close(2) is called on this
1572	* scsi disk.
1573	* @disk: disk to release
1574	*
1575	* Returns 0.
1576	*
1577	* Note: may block (uninterruptible) if error recovery is underway
1578	* on this disk.
1579	*
1580	* Locking: called with disk->open_mutex held.
1581	**/
1582	static void sd_release(struct gendisk *disk)
1583	{
1584	struct scsi_disk *sdkp = scsi_disk(disk);
1585	struct scsi_device *sdev = sdkp->device;
1586
1587	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1588
1589	if (atomic_dec_return(v: &sdkp->openers) == 0 && sdev->removable) {
1590	if (scsi_block_when_processing_errors(sdev))
1591	scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1592	}
1593
1594	scsi_device_put(sdev);
1595	}
1596
1597	static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1598	{
1599	struct scsi_disk *sdkp = scsi_disk(disk: bdev->bd_disk);
1600	struct scsi_device *sdp = sdkp->device;
1601	struct Scsi_Host *host = sdp->host;
1602	sector_t capacity = logical_to_sectors(sdev: sdp, blocks: sdkp->capacity);
1603	int diskinfo[4];
1604
1605	/* default to most commonly used values */
1606	diskinfo[0] = 0x40; /* 1 << 6 */
1607	diskinfo[1] = 0x20; /* 1 << 5 */
1608	diskinfo[2] = capacity >> 11;
1609
1610	/* override with calculated, extended default, or driver values */
1611	if (host->hostt->bios_param)
1612	host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1613	else
1614	scsicam_bios_param(bdev, capacity, ip: diskinfo);
1615
1616	geo->heads = diskinfo[0];
1617	geo->sectors = diskinfo[1];
1618	geo->cylinders = diskinfo[2];
1619	return 0;
1620	}
1621
1622	/**
1623	* sd_ioctl - process an ioctl
1624	* @bdev: target block device
1625	* @mode: open mode
1626	* @cmd: ioctl command number
1627	* @arg: this is third argument given to ioctl(2) system call.
1628	* Often contains a pointer.
1629	*
1630	* Returns 0 if successful (some ioctls return positive numbers on
1631	* success as well). Returns a negated errno value in case of error.
1632	*
1633	* Note: most ioctls are forward onto the block subsystem or further
1634	* down in the scsi subsystem.
1635	**/
1636	static int sd_ioctl(struct block_device *bdev, blk_mode_t mode,
1637	unsigned int cmd, unsigned long arg)
1638	{
1639	struct gendisk *disk = bdev->bd_disk;
1640	struct scsi_disk *sdkp = scsi_disk(disk);
1641	struct scsi_device *sdp = sdkp->device;
1642	void __user *p = (void __user *)arg;
1643	int error;
1644
1645	SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1646	"cmd=0x%x\n", disk->disk_name, cmd));
1647
1648	if (bdev_is_partition(bdev) && !capable(CAP_SYS_RAWIO))
1649	return -ENOIOCTLCMD;
1650
1651	/*
1652	* If we are in the middle of error recovery, don't let anyone
1653	* else try and use this device. Also, if error recovery fails, it
1654	* may try and take the device offline, in which case all further
1655	* access to the device is prohibited.
1656	*/
1657	error = scsi_ioctl_block_when_processing_errors(sdev: sdp, cmd,
1658	ndelay: (mode & BLK_OPEN_NDELAY));
1659	if (error)
1660	return error;
1661
1662	if (is_sed_ioctl(cmd))
1663	return sed_ioctl(dev: sdkp->opal_dev, cmd, ioctl_ptr: p);
1664	return scsi_ioctl(sdev: sdp, open_for_write: mode & BLK_OPEN_WRITE, cmd, arg: p);
1665	}
1666
1667	static void set_media_not_present(struct scsi_disk *sdkp)
1668	{
1669	if (sdkp->media_present)
1670	sdkp->device->changed = 1;
1671
1672	if (sdkp->device->removable) {
1673	sdkp->media_present = 0;
1674	sdkp->capacity = 0;
1675	}
1676	}
1677
1678	static int media_not_present(struct scsi_disk *sdkp,
1679	struct scsi_sense_hdr *sshdr)
1680	{
1681	if (!scsi_sense_valid(sshdr))
1682	return 0;
1683
1684	/* not invoked for commands that could return deferred errors */
1685	switch (sshdr->sense_key) {
1686	case UNIT_ATTENTION:
1687	case NOT_READY:
1688	/* medium not present */
1689	if (sshdr->asc == 0x3A) {
1690	set_media_not_present(sdkp);
1691	return 1;
1692	}
1693	}
1694	return 0;
1695	}
1696
1697	/**
1698	* sd_check_events - check media events
1699	* @disk: kernel device descriptor
1700	* @clearing: disk events currently being cleared
1701	*
1702	* Returns mask of DISK_EVENT_*.
1703	*
1704	* Note: this function is invoked from the block subsystem.
1705	**/
1706	static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1707	{
1708	struct scsi_disk *sdkp = disk->private_data;
1709	struct scsi_device *sdp;
1710	int retval;
1711	bool disk_changed;
1712
1713	if (!sdkp)
1714	return 0;
1715
1716	sdp = sdkp->device;
1717	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1718
1719	/*
1720	* If the device is offline, don't send any commands - just pretend as
1721	* if the command failed. If the device ever comes back online, we
1722	* can deal with it then. It is only because of unrecoverable errors
1723	* that we would ever take a device offline in the first place.
1724	*/
1725	if (!scsi_device_online(sdev: sdp)) {
1726	set_media_not_present(sdkp);
1727	goto out;
1728	}
1729
1730	/*
1731	* Using TEST_UNIT_READY enables differentiation between drive with
1732	* no cartridge loaded - NOT READY, drive with changed cartridge -
1733	* UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1734	*
1735	* Drives that auto spin down. eg iomega jaz 1G, will be started
1736	* by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1737	* sd_revalidate() is called.
1738	*/
1739	if (scsi_block_when_processing_errors(sdp)) {
1740	struct scsi_sense_hdr sshdr = { 0, };
1741
1742	retval = scsi_test_unit_ready(sdev: sdp, SD_TIMEOUT, retries: sdkp->max_retries,
1743	sshdr: &sshdr);
1744
1745	/* failed to execute TUR, assume media not present */
1746	if (retval < 0 || host_byte(retval)) {
1747	set_media_not_present(sdkp);
1748	goto out;
1749	}
1750
1751	if (media_not_present(sdkp, sshdr: &sshdr))
1752	goto out;
1753	}
1754
1755	/*
1756	* For removable scsi disk we have to recognise the presence
1757	* of a disk in the drive.
1758	*/
1759	if (!sdkp->media_present)
1760	sdp->changed = 1;
1761	sdkp->media_present = 1;
1762	out:
1763	/*
1764	* sdp->changed is set under the following conditions:
1765	*
1766	* Medium present state has changed in either direction.
1767	* Device has indicated UNIT_ATTENTION.
1768	*/
1769	disk_changed = sdp->changed;
1770	sdp->changed = 0;
1771	return disk_changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1772	}
1773
1774	static int sd_sync_cache(struct scsi_disk *sdkp)
1775	{
1776	int res;
1777	struct scsi_device *sdp = sdkp->device;
1778	const int timeout = sdp->request_queue->rq_timeout
1779	* SD_FLUSH_TIMEOUT_MULTIPLIER;
1780	/* Leave the rest of the command zero to indicate flush everything. */
1781	const unsigned char cmd[16] = { sdp->use_16_for_sync ?
1782	SYNCHRONIZE_CACHE_16 : SYNCHRONIZE_CACHE };
1783	struct scsi_sense_hdr sshdr;
1784	struct scsi_failure failure_defs[] = {
1785	{
1786	.allowed = 3,
1787	.result = SCMD_FAILURE_RESULT_ANY,
1788	},
1789	{}
1790	};
1791	struct scsi_failures failures = {
1792	.failure_definitions = failure_defs,
1793	};
1794	const struct scsi_exec_args exec_args = {
1795	.req_flags = BLK_MQ_REQ_PM,
1796	.sshdr = &sshdr,
1797	.failures = &failures,
1798	};
1799
1800	if (!scsi_device_online(sdev: sdp))
1801	return -ENODEV;
1802
1803	res = scsi_execute_cmd(sdev: sdp, cmd, opf: REQ_OP_DRV_IN, NULL, bufflen: 0, timeout,
1804	retries: sdkp->max_retries, args: &exec_args);
1805	if (res) {
1806	sd_print_result(sdkp, msg: "Synchronize Cache(10) failed", result: res);
1807
1808	if (res < 0)
1809	return res;
1810
1811	if (scsi_status_is_check_condition(status: res) &&
1812	scsi_sense_valid(sshdr: &sshdr)) {
1813	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
1814
1815	/* we need to evaluate the error return */
1816	if (sshdr.asc == 0x3a || /* medium not present */
1817	sshdr.asc == 0x20 || /* invalid command */
1818	(sshdr.asc == 0x74 && sshdr.ascq == 0x71)) /* drive is password locked */
1819	/* this is no error here */
1820	return 0;
1821
1822	/*
1823	* If a format is in progress or if the drive does not
1824	* support sync, there is not much we can do because
1825	* this is called during shutdown or suspend so just
1826	* return success so those operations can proceed.
1827	*/
1828	if ((sshdr.asc == 0x04 && sshdr.ascq == 0x04) ||
1829	sshdr.sense_key == ILLEGAL_REQUEST)
1830	return 0;
1831	}
1832
1833	switch (host_byte(res)) {
1834	/* ignore errors due to racing a disconnection */
1835	case DID_BAD_TARGET:
1836	case DID_NO_CONNECT:
1837	return 0;
1838	/* signal the upper layer it might try again */
1839	case DID_BUS_BUSY:
1840	case DID_IMM_RETRY:
1841	case DID_REQUEUE:
1842	case DID_SOFT_ERROR:
1843	return -EBUSY;
1844	default:
1845	return -EIO;
1846	}
1847	}
1848	return 0;
1849	}
1850
1851	static void sd_rescan(struct device *dev)
1852	{
1853	struct scsi_disk *sdkp = dev_get_drvdata(dev);
1854
1855	sd_revalidate_disk(sdkp->disk);
1856	}
1857
1858	static int sd_get_unique_id(struct gendisk *disk, u8 id[16],
1859	enum blk_unique_id type)
1860	{
1861	struct scsi_device *sdev = scsi_disk(disk)->device;
1862	const struct scsi_vpd *vpd;
1863	const unsigned char *d;
1864	int ret = -ENXIO, len;
1865
1866	rcu_read_lock();
1867	vpd = rcu_dereference(sdev->vpd_pg83);
1868	if (!vpd)
1869	goto out_unlock;
1870
1871	ret = -EINVAL;
1872	for (d = vpd->data + 4; d < vpd->data + vpd->len; d += d[3] + 4) {
1873	/* we only care about designators with LU association */
1874	if (((d[1] >> 4) & 0x3) != 0x00)
1875	continue;
1876	if ((d[1] & 0xf) != type)
1877	continue;
1878
1879	/*
1880	* Only exit early if a 16-byte descriptor was found. Otherwise
1881	* keep looking as one with more entropy might still show up.
1882	*/
1883	len = d[3];
1884	if (len != 8 && len != 12 && len != 16)
1885	continue;
1886	ret = len;
1887	memcpy(id, d + 4, len);
1888	if (len == 16)
1889	break;
1890	}
1891	out_unlock:
1892	rcu_read_unlock();
1893	return ret;
1894	}
1895
1896	static int sd_scsi_to_pr_err(struct scsi_sense_hdr *sshdr, int result)
1897	{
1898	switch (host_byte(result)) {
1899	case DID_TRANSPORT_MARGINAL:
1900	case DID_TRANSPORT_DISRUPTED:
1901	case DID_BUS_BUSY:
1902	return PR_STS_RETRY_PATH_FAILURE;
1903	case DID_NO_CONNECT:
1904	return PR_STS_PATH_FAILED;
1905	case DID_TRANSPORT_FAILFAST:
1906	return PR_STS_PATH_FAST_FAILED;
1907	}
1908
1909	switch (status_byte(result)) {
1910	case SAM_STAT_RESERVATION_CONFLICT:
1911	return PR_STS_RESERVATION_CONFLICT;
1912	case SAM_STAT_CHECK_CONDITION:
1913	if (!scsi_sense_valid(sshdr))
1914	return PR_STS_IOERR;
1915
1916	if (sshdr->sense_key == ILLEGAL_REQUEST &&
1917	(sshdr->asc == 0x26 || sshdr->asc == 0x24))
1918	return -EINVAL;
1919
1920	fallthrough;
1921	default:
1922	return PR_STS_IOERR;
1923	}
1924	}
1925
1926	static int sd_pr_in_command(struct block_device *bdev, u8 sa,
1927	unsigned char *data, int data_len)
1928	{
1929	struct scsi_disk *sdkp = scsi_disk(disk: bdev->bd_disk);
1930	struct scsi_device *sdev = sdkp->device;
1931	struct scsi_sense_hdr sshdr;
1932	u8 cmd[10] = { PERSISTENT_RESERVE_IN, sa };
1933	struct scsi_failure failure_defs[] = {
1934	{
1935	.sense = UNIT_ATTENTION,
1936	.asc = SCMD_FAILURE_ASC_ANY,
1937	.ascq = SCMD_FAILURE_ASCQ_ANY,
1938	.allowed = 5,
1939	.result = SAM_STAT_CHECK_CONDITION,
1940	},
1941	{}
1942	};
1943	struct scsi_failures failures = {
1944	.failure_definitions = failure_defs,
1945	};
1946	const struct scsi_exec_args exec_args = {
1947	.sshdr = &sshdr,
1948	.failures = &failures,
1949	};
1950	int result;
1951
1952	put_unaligned_be16(val: data_len, p: &cmd[7]);
1953
1954	result = scsi_execute_cmd(sdev, cmd, opf: REQ_OP_DRV_IN, buffer: data, bufflen: data_len,
1955	SD_TIMEOUT, retries: sdkp->max_retries, args: &exec_args);
1956	if (scsi_status_is_check_condition(status: result) &&
1957	scsi_sense_valid(sshdr: &sshdr)) {
1958	sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1959	scsi_print_sense_hdr(sdev, NULL, &sshdr);
1960	}
1961
1962	if (result <= 0)
1963	return result;
1964
1965	return sd_scsi_to_pr_err(sshdr: &sshdr, result);
1966	}
1967
1968	static int sd_pr_read_keys(struct block_device *bdev, struct pr_keys *keys_info)
1969	{
1970	int result, i, data_offset, num_copy_keys;
1971	u32 num_keys = keys_info->num_keys;
1972	int data_len = num_keys * 8 + 8;
1973	u8 *data;
1974
1975	data = kzalloc(data_len, GFP_KERNEL);
1976	if (!data)
1977	return -ENOMEM;
1978
1979	result = sd_pr_in_command(bdev, READ_KEYS, data, data_len);
1980	if (result)
1981	goto free_data;
1982
1983	keys_info->generation = get_unaligned_be32(p: &data[0]);
1984	keys_info->num_keys = get_unaligned_be32(p: &data[4]) / 8;
1985
1986	data_offset = 8;
1987	num_copy_keys = min(num_keys, keys_info->num_keys);
1988
1989	for (i = 0; i < num_copy_keys; i++) {
1990	keys_info->keys[i] = get_unaligned_be64(p: &data[data_offset]);
1991	data_offset += 8;
1992	}
1993
1994	free_data:
1995	kfree(objp: data);
1996	return result;
1997	}
1998
1999	static int sd_pr_read_reservation(struct block_device *bdev,
2000	struct pr_held_reservation *rsv)
2001	{
2002	struct scsi_disk *sdkp = scsi_disk(disk: bdev->bd_disk);
2003	struct scsi_device *sdev = sdkp->device;
2004	u8 data[24] = { };
2005	int result, len;
2006
2007	result = sd_pr_in_command(bdev, READ_RESERVATION, data, data_len: sizeof(data));
2008	if (result)
2009	return result;
2010
2011	len = get_unaligned_be32(p: &data[4]);
2012	if (!len)
2013	return 0;
2014
2015	/* Make sure we have at least the key and type */
2016	if (len < 14) {
2017	sdev_printk(KERN_INFO, sdev,
2018	"READ RESERVATION failed due to short return buffer of %d bytes\n",
2019	len);
2020	return -EINVAL;
2021	}
2022
2023	rsv->generation = get_unaligned_be32(p: &data[0]);
2024	rsv->key = get_unaligned_be64(p: &data[8]);
2025	rsv->type = scsi_pr_type_to_block(type: data[21] & 0x0f);
2026	return 0;
2027	}
2028
2029	static int sd_pr_out_command(struct block_device *bdev, u8 sa, u64 key,
2030	u64 sa_key, enum scsi_pr_type type, u8 flags)
2031	{
2032	struct scsi_disk *sdkp = scsi_disk(disk: bdev->bd_disk);
2033	struct scsi_device *sdev = sdkp->device;
2034	struct scsi_sense_hdr sshdr;
2035	struct scsi_failure failure_defs[] = {
2036	{
2037	.sense = UNIT_ATTENTION,
2038	.asc = SCMD_FAILURE_ASC_ANY,
2039	.ascq = SCMD_FAILURE_ASCQ_ANY,
2040	.allowed = 5,
2041	.result = SAM_STAT_CHECK_CONDITION,
2042	},
2043	{}
2044	};
2045	struct scsi_failures failures = {
2046	.failure_definitions = failure_defs,
2047	};
2048	const struct scsi_exec_args exec_args = {
2049	.sshdr = &sshdr,
2050	.failures = &failures,
2051	};
2052	int result;
2053	u8 cmd[16] = { 0, };
2054	u8 data[24] = { 0, };
2055
2056	cmd[0] = PERSISTENT_RESERVE_OUT;
2057	cmd[1] = sa;
2058	cmd[2] = type;
2059	put_unaligned_be32(val: sizeof(data), p: &cmd[5]);
2060
2061	put_unaligned_be64(val: key, p: &data[0]);
2062	put_unaligned_be64(val: sa_key, p: &data[8]);
2063	data[20] = flags;
2064
2065	result = scsi_execute_cmd(sdev, cmd, opf: REQ_OP_DRV_OUT, buffer: &data,
2066	bufflen: sizeof(data), SD_TIMEOUT, retries: sdkp->max_retries,
2067	args: &exec_args);
2068
2069	if (scsi_status_is_check_condition(status: result) &&
2070	scsi_sense_valid(sshdr: &sshdr)) {
2071	sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
2072	scsi_print_sense_hdr(sdev, NULL, &sshdr);
2073	}
2074
2075	if (result <= 0)
2076	return result;
2077
2078	return sd_scsi_to_pr_err(sshdr: &sshdr, result);
2079	}
2080
2081	static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
2082	u32 flags)
2083	{
2084	if (flags & ~PR_FL_IGNORE_KEY)
2085	return -EOPNOTSUPP;
2086	return sd_pr_out_command(bdev, sa: (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
2087	key: old_key, sa_key: new_key, type: 0,
2088	flags: (1 << 0) /* APTPL */);
2089	}
2090
2091	static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
2092	u32 flags)
2093	{
2094	if (flags)
2095	return -EOPNOTSUPP;
2096	return sd_pr_out_command(bdev, sa: 0x01, key, sa_key: 0,
2097	type: block_pr_type_to_scsi(type), flags: 0);
2098	}
2099
2100	static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
2101	{
2102	return sd_pr_out_command(bdev, sa: 0x02, key, sa_key: 0,
2103	type: block_pr_type_to_scsi(type), flags: 0);
2104	}
2105
2106	static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
2107	enum pr_type type, bool abort)
2108	{
2109	return sd_pr_out_command(bdev, sa: abort ? 0x05 : 0x04, key: old_key, sa_key: new_key,
2110	type: block_pr_type_to_scsi(type), flags: 0);
2111	}
2112
2113	static int sd_pr_clear(struct block_device *bdev, u64 key)
2114	{
2115	return sd_pr_out_command(bdev, sa: 0x03, key, sa_key: 0, type: 0, flags: 0);
2116	}
2117
2118	static const struct pr_ops sd_pr_ops = {
2119	.pr_register = sd_pr_register,
2120	.pr_reserve = sd_pr_reserve,
2121	.pr_release = sd_pr_release,
2122	.pr_preempt = sd_pr_preempt,
2123	.pr_clear = sd_pr_clear,
2124	.pr_read_keys = sd_pr_read_keys,
2125	.pr_read_reservation = sd_pr_read_reservation,
2126	};
2127
2128	static void scsi_disk_free_disk(struct gendisk *disk)
2129	{
2130	struct scsi_disk *sdkp = scsi_disk(disk);
2131
2132	put_device(dev: &sdkp->disk_dev);
2133	}
2134
2135	static const struct block_device_operations sd_fops = {
2136	.owner = THIS_MODULE,
2137	.open = sd_open,
2138	.release = sd_release,
2139	.ioctl = sd_ioctl,
2140	.getgeo = sd_getgeo,
2141	.compat_ioctl = blkdev_compat_ptr_ioctl,
2142	.check_events = sd_check_events,
2143	.unlock_native_capacity = sd_unlock_native_capacity,
2144	.report_zones = sd_zbc_report_zones,
2145	.get_unique_id = sd_get_unique_id,
2146	.free_disk = scsi_disk_free_disk,
2147	.pr_ops = &sd_pr_ops,
2148	};
2149
2150	/**
2151	* sd_eh_reset - reset error handling callback
2152	* @scmd: sd-issued command that has failed
2153	*
2154	* This function is called by the SCSI midlayer before starting
2155	* SCSI EH. When counting medium access failures we have to be
2156	* careful to register it only only once per device and SCSI EH run;
2157	* there might be several timed out commands which will cause the
2158	* 'max_medium_access_timeouts' counter to trigger after the first
2159	* SCSI EH run already and set the device to offline.
2160	* So this function resets the internal counter before starting SCSI EH.
2161	**/
2162	static void sd_eh_reset(struct scsi_cmnd *scmd)
2163	{
2164	struct scsi_disk *sdkp = scsi_disk(disk: scsi_cmd_to_rq(scmd)->q->disk);
2165
2166	/* New SCSI EH run, reset gate variable */
2167	sdkp->ignore_medium_access_errors = false;
2168	}
2169
2170	/**
2171	* sd_eh_action - error handling callback
2172	* @scmd: sd-issued command that has failed
2173	* @eh_disp: The recovery disposition suggested by the midlayer
2174	*
2175	* This function is called by the SCSI midlayer upon completion of an
2176	* error test command (currently TEST UNIT READY). The result of sending
2177	* the eh command is passed in eh_disp. We're looking for devices that
2178	* fail medium access commands but are OK with non access commands like
2179	* test unit ready (so wrongly see the device as having a successful
2180	* recovery)
2181	**/
2182	static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
2183	{
2184	struct scsi_disk *sdkp = scsi_disk(disk: scsi_cmd_to_rq(scmd)->q->disk);
2185	struct scsi_device *sdev = scmd->device;
2186
2187	if (!scsi_device_online(sdev) ||
2188	!scsi_medium_access_command(scmd) ||
2189	host_byte(scmd->result) != DID_TIME_OUT ||
2190	eh_disp != SUCCESS)
2191	return eh_disp;
2192
2193	/*
2194	* The device has timed out executing a medium access command.
2195	* However, the TEST UNIT READY command sent during error
2196	* handling completed successfully. Either the device is in the
2197	* process of recovering or has it suffered an internal failure
2198	* that prevents access to the storage medium.
2199	*/
2200	if (!sdkp->ignore_medium_access_errors) {
2201	sdkp->medium_access_timed_out++;
2202	sdkp->ignore_medium_access_errors = true;
2203	}
2204
2205	/*
2206	* If the device keeps failing read/write commands but TEST UNIT
2207	* READY always completes successfully we assume that medium
2208	* access is no longer possible and take the device offline.
2209	*/
2210	if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
2211	scmd_printk(KERN_ERR, scmd,
2212	"Medium access timeout failure. Offlining disk!\n");
2213	mutex_lock(&sdev->state_mutex);
2214	scsi_device_set_state(sdev, state: SDEV_OFFLINE);
2215	mutex_unlock(lock: &sdev->state_mutex);
2216
2217	return SUCCESS;
2218	}
2219
2220	return eh_disp;
2221	}
2222
2223	static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
2224	{
2225	struct request *req = scsi_cmd_to_rq(scmd);
2226	struct scsi_device *sdev = scmd->device;
2227	unsigned int transferred, good_bytes;
2228	u64 start_lba, end_lba, bad_lba;
2229
2230	/*
2231	* Some commands have a payload smaller than the device logical
2232	* block size (e.g. INQUIRY on a 4K disk).
2233	*/
2234	if (scsi_bufflen(cmd: scmd) <= sdev->sector_size)
2235	return 0;
2236
2237	/* Check if we have a 'bad_lba' information */
2238	if (!scsi_get_sense_info_fld(sense_buffer: scmd->sense_buffer,
2239	SCSI_SENSE_BUFFERSIZE,
2240	info_out: &bad_lba))
2241	return 0;
2242
2243	/*
2244	* If the bad lba was reported incorrectly, we have no idea where
2245	* the error is.
2246	*/
2247	start_lba = sectors_to_logical(sdev, sector: blk_rq_pos(rq: req));
2248	end_lba = start_lba + bytes_to_logical(sdev, bytes: scsi_bufflen(cmd: scmd));
2249	if (bad_lba < start_lba || bad_lba >= end_lba)
2250	return 0;
2251
2252	/*
2253	* resid is optional but mostly filled in. When it's unused,
2254	* its value is zero, so we assume the whole buffer transferred
2255	*/
2256	transferred = scsi_bufflen(cmd: scmd) - scsi_get_resid(cmd: scmd);
2257
2258	/* This computation should always be done in terms of the
2259	* resolution of the device's medium.
2260	*/
2261	good_bytes = logical_to_bytes(sdev, blocks: bad_lba - start_lba);
2262
2263	return min(good_bytes, transferred);
2264	}
2265
2266	/**
2267	* sd_done - bottom half handler: called when the lower level
2268	* driver has completed (successfully or otherwise) a scsi command.
2269	* @SCpnt: mid-level's per command structure.
2270	*
2271	* Note: potentially run from within an ISR. Must not block.
2272	**/
2273	static int sd_done(struct scsi_cmnd *SCpnt)
2274	{
2275	int result = SCpnt->result;
2276	unsigned int good_bytes = result ? 0 : scsi_bufflen(cmd: SCpnt);
2277	unsigned int sector_size = SCpnt->device->sector_size;
2278	unsigned int resid;
2279	struct scsi_sense_hdr sshdr;
2280	struct request *req = scsi_cmd_to_rq(scmd: SCpnt);
2281	struct scsi_disk *sdkp = scsi_disk(disk: req->q->disk);
2282	int sense_valid = 0;
2283	int sense_deferred = 0;
2284
2285	switch (req_op(req)) {
2286	case REQ_OP_DISCARD:
2287	case REQ_OP_WRITE_ZEROES:
2288	case REQ_OP_ZONE_RESET:
2289	case REQ_OP_ZONE_RESET_ALL:
2290	case REQ_OP_ZONE_OPEN:
2291	case REQ_OP_ZONE_CLOSE:
2292	case REQ_OP_ZONE_FINISH:
2293	if (!result) {
2294	good_bytes = blk_rq_bytes(rq: req);
2295	scsi_set_resid(cmd: SCpnt, resid: 0);
2296	} else {
2297	good_bytes = 0;
2298	scsi_set_resid(cmd: SCpnt, resid: blk_rq_bytes(rq: req));
2299	}
2300	break;
2301	default:
2302	/*
2303	* In case of bogus fw or device, we could end up having
2304	* an unaligned partial completion. Check this here and force
2305	* alignment.
2306	*/
2307	resid = scsi_get_resid(cmd: SCpnt);
2308	if (resid & (sector_size - 1)) {
2309	sd_printk(KERN_INFO, sdkp,
2310	"Unaligned partial completion (resid=%u, sector_sz=%u)\n",
2311	resid, sector_size);
2312	scsi_print_command(SCpnt);
2313	resid = min(scsi_bufflen(SCpnt),
2314	round_up(resid, sector_size));
2315	scsi_set_resid(cmd: SCpnt, resid);
2316	}
2317	}
2318
2319	if (result) {
2320	sense_valid = scsi_command_normalize_sense(cmd: SCpnt, sshdr: &sshdr);
2321	if (sense_valid)
2322	sense_deferred = scsi_sense_is_deferred(sshdr: &sshdr);
2323	}
2324	sdkp->medium_access_timed_out = 0;
2325
2326	if (!scsi_status_is_check_condition(status: result) &&
2327	(!sense_valid || sense_deferred))
2328	goto out;
2329
2330	switch (sshdr.sense_key) {
2331	case HARDWARE_ERROR:
2332	case MEDIUM_ERROR:
2333	good_bytes = sd_completed_bytes(scmd: SCpnt);
2334	break;
2335	case RECOVERED_ERROR:
2336	good_bytes = scsi_bufflen(cmd: SCpnt);
2337	break;
2338	case NO_SENSE:
2339	/* This indicates a false check condition, so ignore it. An
2340	* unknown amount of data was transferred so treat it as an
2341	* error.
2342	*/
2343	SCpnt->result = 0;
2344	memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2345	break;
2346	case ABORTED_COMMAND:
2347	if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
2348	good_bytes = sd_completed_bytes(scmd: SCpnt);
2349	break;
2350	case ILLEGAL_REQUEST:
2351	switch (sshdr.asc) {
2352	case 0x10: /* DIX: Host detected corruption */
2353	good_bytes = sd_completed_bytes(scmd: SCpnt);
2354	break;
2355	case 0x20: /* INVALID COMMAND OPCODE */
2356	case 0x24: /* INVALID FIELD IN CDB */
2357	switch (SCpnt->cmnd[0]) {
2358	case UNMAP:
2359	sd_disable_discard(sdkp);
2360	break;
2361	case WRITE_SAME_16:
2362	case WRITE_SAME:
2363	if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2364	sd_disable_discard(sdkp);
2365	} else {
2366	sd_disable_write_same(sdkp);
2367	req->rq_flags |= RQF_QUIET;
2368	}
2369	break;
2370	}
2371	}
2372	break;
2373	default:
2374	break;
2375	}
2376
2377	out:
2378	if (sdkp->device->type == TYPE_ZBC)
2379	good_bytes = sd_zbc_complete(cmd: SCpnt, good_bytes, sshdr: &sshdr);
2380
2381	SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2382	"sd_done: completed %d of %d bytes\n",
2383	good_bytes, scsi_bufflen(SCpnt)));
2384
2385	return good_bytes;
2386	}
2387
2388	/*
2389	* spinup disk - called only in sd_revalidate_disk()
2390	*/
2391	static void
2392	sd_spinup_disk(struct scsi_disk *sdkp)
2393	{
2394	static const u8 cmd[10] = { TEST_UNIT_READY };
2395	unsigned long spintime_expire = 0;
2396	int spintime, sense_valid = 0;
2397	unsigned int the_result;
2398	struct scsi_sense_hdr sshdr;
2399	struct scsi_failure failure_defs[] = {
2400	/* Do not retry Medium Not Present */
2401	{
2402	.sense = UNIT_ATTENTION,
2403	.asc = 0x3A,
2404	.ascq = SCMD_FAILURE_ASCQ_ANY,
2405	.result = SAM_STAT_CHECK_CONDITION,
2406	},
2407	{
2408	.sense = NOT_READY,
2409	.asc = 0x3A,
2410	.ascq = SCMD_FAILURE_ASCQ_ANY,
2411	.result = SAM_STAT_CHECK_CONDITION,
2412	},
2413	/* Retry when scsi_status_is_good would return false 3 times */
2414	{
2415	.result = SCMD_FAILURE_STAT_ANY,
2416	.allowed = 3,
2417	},
2418	{}
2419	};
2420	struct scsi_failures failures = {
2421	.failure_definitions = failure_defs,
2422	};
2423	const struct scsi_exec_args exec_args = {
2424	.sshdr = &sshdr,
2425	.failures = &failures,
2426	};
2427
2428	spintime = 0;
2429
2430	/* Spin up drives, as required. Only do this at boot time */
2431	/* Spinup needs to be done for module loads too. */
2432	do {
2433	bool media_was_present = sdkp->media_present;
2434
2435	scsi_failures_reset_retries(failures: &failures);
2436
2437	the_result = scsi_execute_cmd(sdev: sdkp->device, cmd, opf: REQ_OP_DRV_IN,
2438	NULL, bufflen: 0, SD_TIMEOUT,
2439	retries: sdkp->max_retries, args: &exec_args);
2440
2441
2442	if (the_result > 0) {
2443	/*
2444	* If the drive has indicated to us that it doesn't
2445	* have any media in it, don't bother with any more
2446	* polling.
2447	*/
2448	if (media_not_present(sdkp, sshdr: &sshdr)) {
2449	if (media_was_present)
2450	sd_printk(KERN_NOTICE, sdkp,
2451	"Media removed, stopped polling\n");
2452	return;
2453	}
2454	sense_valid = scsi_sense_valid(sshdr: &sshdr);
2455	}
2456
2457	if (!scsi_status_is_check_condition(status: the_result)) {
2458	/* no sense, TUR either succeeded or failed
2459	* with a status error */
2460	if(!spintime && !scsi_status_is_good(status: the_result)) {
2461	sd_print_result(sdkp, msg: "Test Unit Ready failed",
2462	result: the_result);
2463	}
2464	break;
2465	}
2466
2467	/*
2468	* The device does not want the automatic start to be issued.
2469	*/
2470	if (sdkp->device->no_start_on_add)
2471	break;
2472
2473	if (sense_valid && sshdr.sense_key == NOT_READY) {
2474	if (sshdr.asc == 4 && sshdr.ascq == 3)
2475	break; /* manual intervention required */
2476	if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2477	break; /* standby */
2478	if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2479	break; /* unavailable */
2480	if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2481	break; /* sanitize in progress */
2482	if (sshdr.asc == 4 && sshdr.ascq == 0x24)
2483	break; /* depopulation in progress */
2484	if (sshdr.asc == 4 && sshdr.ascq == 0x25)
2485	break; /* depopulation restoration in progress */
2486	/*
2487	* Issue command to spin up drive when not ready
2488	*/
2489	if (!spintime) {
2490	/* Return immediately and start spin cycle */
2491	const u8 start_cmd[10] = {
2492	[0] = START_STOP,
2493	[1] = 1,
2494	[4] = sdkp->device->start_stop_pwr_cond ?
2495	0x11 : 1,
2496	};
2497
2498	sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2499	scsi_execute_cmd(sdev: sdkp->device, cmd: start_cmd,
2500	opf: REQ_OP_DRV_IN, NULL, bufflen: 0,
2501	SD_TIMEOUT, retries: sdkp->max_retries,
2502	args: &exec_args);
2503	spintime_expire = jiffies + 100 * HZ;
2504	spintime = 1;
2505	}
2506	/* Wait 1 second for next try */
2507	msleep(msecs: 1000);
2508	printk(KERN_CONT ".");
2509
2510	/*
2511	* Wait for USB flash devices with slow firmware.
2512	* Yes, this sense key/ASC combination shouldn't
2513	* occur here. It's characteristic of these devices.
2514	*/
2515	} else if (sense_valid &&
2516	sshdr.sense_key == UNIT_ATTENTION &&
2517	sshdr.asc == 0x28) {
2518	if (!spintime) {
2519	spintime_expire = jiffies + 5 * HZ;
2520	spintime = 1;
2521	}
2522	/* Wait 1 second for next try */
2523	msleep(msecs: 1000);
2524	} else {
2525	/* we don't understand the sense code, so it's
2526	* probably pointless to loop */
2527	if(!spintime) {
2528	sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2529	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
2530	}
2531	break;
2532	}
2533
2534	} while (spintime && time_before_eq(jiffies, spintime_expire));
2535
2536	if (spintime) {
2537	if (scsi_status_is_good(status: the_result))
2538	printk(KERN_CONT "ready\n");
2539	else
2540	printk(KERN_CONT "not responding...\n");
2541	}
2542	}
2543
2544	/*
2545	* Determine whether disk supports Data Integrity Field.
2546	*/
2547	static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2548	{
2549	struct scsi_device *sdp = sdkp->device;
2550	u8 type;
2551
2552	if (scsi_device_protection(sdev: sdp) == 0 || (buffer[12] & 1) == 0) {
2553	sdkp->protection_type = 0;
2554	return 0;
2555	}
2556
2557	type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2558
2559	if (type > T10_PI_TYPE3_PROTECTION) {
2560	sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2561	" protection type %u. Disabling disk!\n",
2562	type);
2563	sdkp->protection_type = 0;
2564	return -ENODEV;
2565	}
2566
2567	sdkp->protection_type = type;
2568
2569	return 0;
2570	}
2571
2572	static void sd_config_protection(struct scsi_disk *sdkp,
2573	struct queue_limits *lim)
2574	{
2575	struct scsi_device *sdp = sdkp->device;
2576
2577	if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))
2578	sd_dif_config_host(sdkp, lim);
2579
2580	if (!sdkp->protection_type)
2581	return;
2582
2583	if (!scsi_host_dif_capable(shost: sdp->host, target_type: sdkp->protection_type)) {
2584	sd_first_printk(KERN_NOTICE, sdkp,
2585	"Disabling DIF Type %u protection\n",
2586	sdkp->protection_type);
2587	sdkp->protection_type = 0;
2588	}
2589
2590	sd_first_printk(KERN_NOTICE, sdkp, "Enabling DIF Type %u protection\n",
2591	sdkp->protection_type);
2592	}
2593
2594	static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2595	struct scsi_sense_hdr *sshdr, int sense_valid,
2596	int the_result)
2597	{
2598	if (sense_valid)
2599	sd_print_sense_hdr(sdkp, sshdr);
2600	else
2601	sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2602
2603	/*
2604	* Set dirty bit for removable devices if not ready -
2605	* sometimes drives will not report this properly.
2606	*/
2607	if (sdp->removable &&
2608	sense_valid && sshdr->sense_key == NOT_READY)
2609	set_media_not_present(sdkp);
2610
2611	/*
2612	* We used to set media_present to 0 here to indicate no media
2613	* in the drive, but some drives fail read capacity even with
2614	* media present, so we can't do that.
2615	*/
2616	sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2617	}
2618
2619	#define RC16_LEN 32
2620	#if RC16_LEN > SD_BUF_SIZE
2621	#error RC16_LEN must not be more than SD_BUF_SIZE
2622	#endif
2623
2624	#define READ_CAPACITY_RETRIES_ON_RESET 10
2625
2626	static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2627	struct queue_limits *lim, unsigned char *buffer)
2628	{
2629	unsigned char cmd[16];
2630	struct scsi_sense_hdr sshdr;
2631	const struct scsi_exec_args exec_args = {
2632	.sshdr = &sshdr,
2633	};
2634	int sense_valid = 0;
2635	int the_result;
2636	int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2637	unsigned int alignment;
2638	unsigned long long lba;
2639	unsigned sector_size;
2640
2641	if (sdp->no_read_capacity_16)
2642	return -EINVAL;
2643
2644	do {
2645	memset(cmd, 0, 16);
2646	cmd[0] = SERVICE_ACTION_IN_16;
2647	cmd[1] = SAI_READ_CAPACITY_16;
2648	cmd[13] = RC16_LEN;
2649	memset(buffer, 0, RC16_LEN);
2650
2651	the_result = scsi_execute_cmd(sdev: sdp, cmd, opf: REQ_OP_DRV_IN,
2652	buffer, RC16_LEN, SD_TIMEOUT,
2653	retries: sdkp->max_retries, args: &exec_args);
2654	if (the_result > 0) {
2655	if (media_not_present(sdkp, sshdr: &sshdr))
2656	return -ENODEV;
2657
2658	sense_valid = scsi_sense_valid(sshdr: &sshdr);
2659	if (sense_valid &&
2660	sshdr.sense_key == ILLEGAL_REQUEST &&
2661	(sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2662	sshdr.ascq == 0x00)
2663	/* Invalid Command Operation Code or
2664	* Invalid Field in CDB, just retry
2665	* silently with RC10 */
2666	return -EINVAL;
2667	if (sense_valid &&
2668	sshdr.sense_key == UNIT_ATTENTION &&
2669	sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2670	/* Device reset might occur several times,
2671	* give it one more chance */
2672	if (--reset_retries > 0)
2673	continue;
2674	}
2675	retries--;
2676
2677	} while (the_result && retries);
2678
2679	if (the_result) {
2680	sd_print_result(sdkp, msg: "Read Capacity(16) failed", result: the_result);
2681	read_capacity_error(sdkp, sdp, sshdr: &sshdr, sense_valid, the_result);
2682	return -EINVAL;
2683	}
2684
2685	sector_size = get_unaligned_be32(p: &buffer[8]);
2686	lba = get_unaligned_be64(p: &buffer[0]);
2687
2688	if (sd_read_protection_type(sdkp, buffer) < 0) {
2689	sdkp->capacity = 0;
2690	return -ENODEV;
2691	}
2692
2693	/* Logical blocks per physical block exponent */
2694	sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2695
2696	/* RC basis */
2697	sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2698
2699	/* Lowest aligned logical block */
2700	alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2701	lim->alignment_offset = alignment;
2702	if (alignment && sdkp->first_scan)
2703	sd_printk(KERN_NOTICE, sdkp,
2704	"physical block alignment offset: %u\n", alignment);
2705
2706	if (buffer[14] & 0x80) { /* LBPME */
2707	sdkp->lbpme = 1;
2708
2709	if (buffer[14] & 0x40) /* LBPRZ */
2710	sdkp->lbprz = 1;
2711	}
2712
2713	sdkp->capacity = lba + 1;
2714	return sector_size;
2715	}
2716
2717	static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2718	unsigned char *buffer)
2719	{
2720	static const u8 cmd[10] = { READ_CAPACITY };
2721	struct scsi_sense_hdr sshdr;
2722	struct scsi_failure failure_defs[] = {
2723	/* Do not retry Medium Not Present */
2724	{
2725	.sense = UNIT_ATTENTION,
2726	.asc = 0x3A,
2727	.result = SAM_STAT_CHECK_CONDITION,
2728	},
2729	{
2730	.sense = NOT_READY,
2731	.asc = 0x3A,
2732	.result = SAM_STAT_CHECK_CONDITION,
2733	},
2734	/* Device reset might occur several times so retry a lot */
2735	{
2736	.sense = UNIT_ATTENTION,
2737	.asc = 0x29,
2738	.allowed = READ_CAPACITY_RETRIES_ON_RESET,
2739	.result = SAM_STAT_CHECK_CONDITION,
2740	},
2741	/* Any other error not listed above retry 3 times */
2742	{
2743	.result = SCMD_FAILURE_RESULT_ANY,
2744	.allowed = 3,
2745	},
2746	{}
2747	};
2748	struct scsi_failures failures = {
2749	.failure_definitions = failure_defs,
2750	};
2751	const struct scsi_exec_args exec_args = {
2752	.sshdr = &sshdr,
2753	.failures = &failures,
2754	};
2755	int sense_valid = 0;
2756	int the_result;
2757	sector_t lba;
2758	unsigned sector_size;
2759
2760	memset(buffer, 0, 8);
2761
2762	the_result = scsi_execute_cmd(sdev: sdp, cmd, opf: REQ_OP_DRV_IN, buffer,
2763	bufflen: 8, SD_TIMEOUT, retries: sdkp->max_retries,
2764	args: &exec_args);
2765
2766	if (the_result > 0) {
2767	sense_valid = scsi_sense_valid(sshdr: &sshdr);
2768
2769	if (media_not_present(sdkp, sshdr: &sshdr))
2770	return -ENODEV;
2771	}
2772
2773	if (the_result) {
2774	sd_print_result(sdkp, msg: "Read Capacity(10) failed", result: the_result);
2775	read_capacity_error(sdkp, sdp, sshdr: &sshdr, sense_valid, the_result);
2776	return -EINVAL;
2777	}
2778
2779	sector_size = get_unaligned_be32(p: &buffer[4]);
2780	lba = get_unaligned_be32(p: &buffer[0]);
2781
2782	if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2783	/* Some buggy (usb cardreader) devices return an lba of
2784	0xffffffff when the want to report a size of 0 (with
2785	which they really mean no media is present) */
2786	sdkp->capacity = 0;
2787	sdkp->physical_block_size = sector_size;
2788	return sector_size;
2789	}
2790
2791	sdkp->capacity = lba + 1;
2792	sdkp->physical_block_size = sector_size;
2793	return sector_size;
2794	}
2795
2796	static int sd_try_rc16_first(struct scsi_device *sdp)
2797	{
2798	if (sdp->host->max_cmd_len < 16)
2799	return 0;
2800	if (sdp->try_rc_10_first)
2801	return 0;
2802	if (sdp->scsi_level > SCSI_SPC_2)
2803	return 1;
2804	if (scsi_device_protection(sdev: sdp))
2805	return 1;
2806	return 0;
2807	}
2808
2809	/*
2810	* read disk capacity
2811	*/
2812	static void
2813	sd_read_capacity(struct scsi_disk *sdkp, struct queue_limits *lim,
2814	unsigned char *buffer)
2815	{
2816	int sector_size;
2817	struct scsi_device *sdp = sdkp->device;
2818
2819	if (sd_try_rc16_first(sdp)) {
2820	sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2821	if (sector_size == -EOVERFLOW)
2822	goto got_data;
2823	if (sector_size == -ENODEV)
2824	return;
2825	if (sector_size < 0)
2826	sector_size = read_capacity_10(sdkp, sdp, buffer);
2827	if (sector_size < 0)
2828	return;
2829	} else {
2830	sector_size = read_capacity_10(sdkp, sdp, buffer);
2831	if (sector_size == -EOVERFLOW)
2832	goto got_data;
2833	if (sector_size < 0)
2834	return;
2835	if ((sizeof(sdkp->capacity) > 4) &&
2836	(sdkp->capacity > 0xffffffffULL)) {
2837	int old_sector_size = sector_size;
2838	sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2839	"Trying to use READ CAPACITY(16).\n");
2840	sector_size = read_capacity_16(sdkp, sdp, lim, buffer);
2841	if (sector_size < 0) {
2842	sd_printk(KERN_NOTICE, sdkp,
2843	"Using 0xffffffff as device size\n");
2844	sdkp->capacity = 1 + (sector_t) 0xffffffff;
2845	sector_size = old_sector_size;
2846	goto got_data;
2847	}
2848	/* Remember that READ CAPACITY(16) succeeded */
2849	sdp->try_rc_10_first = 0;
2850	}
2851	}
2852
2853	/* Some devices are known to return the total number of blocks,
2854	* not the highest block number. Some devices have versions
2855	* which do this and others which do not. Some devices we might
2856	* suspect of doing this but we don't know for certain.
2857	*
2858	* If we know the reported capacity is wrong, decrement it. If
2859	* we can only guess, then assume the number of blocks is even
2860	* (usually true but not always) and err on the side of lowering
2861	* the capacity.
2862	*/
2863	if (sdp->fix_capacity ||
2864	(sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2865	sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2866	"from its reported value: %llu\n",
2867	(unsigned long long) sdkp->capacity);
2868	--sdkp->capacity;
2869	}
2870
2871	got_data:
2872	if (sector_size == 0) {
2873	sector_size = 512;
2874	sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2875	"assuming 512.\n");
2876	}
2877
2878	if (sector_size != 512 &&
2879	sector_size != 1024 &&
2880	sector_size != 2048 &&
2881	sector_size != 4096) {
2882	sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2883	sector_size);
2884	/*
2885	* The user might want to re-format the drive with
2886	* a supported sectorsize. Once this happens, it
2887	* would be relatively trivial to set the thing up.
2888	* For this reason, we leave the thing in the table.
2889	*/
2890	sdkp->capacity = 0;
2891	/*
2892	* set a bogus sector size so the normal read/write
2893	* logic in the block layer will eventually refuse any
2894	* request on this device without tripping over power
2895	* of two sector size assumptions
2896	*/
2897	sector_size = 512;
2898	}
2899	lim->logical_block_size = sector_size;
2900	lim->physical_block_size = sdkp->physical_block_size;
2901	sdkp->device->sector_size = sector_size;
2902
2903	if (sdkp->capacity > 0xffffffff)
2904	sdp->use_16_for_rw = 1;
2905
2906	}
2907
2908	/*
2909	* Print disk capacity
2910	*/
2911	static void
2912	sd_print_capacity(struct scsi_disk *sdkp,
2913	sector_t old_capacity)
2914	{
2915	int sector_size = sdkp->device->sector_size;
2916	char cap_str_2[10], cap_str_10[10];
2917
2918	if (!sdkp->first_scan && old_capacity == sdkp->capacity)
2919	return;
2920
2921	string_get_size(size: sdkp->capacity, blk_size: sector_size,
2922	units: STRING_UNITS_2, buf: cap_str_2, len: sizeof(cap_str_2));
2923	string_get_size(size: sdkp->capacity, blk_size: sector_size,
2924	units: STRING_UNITS_10, buf: cap_str_10, len: sizeof(cap_str_10));
2925
2926	sd_printk(KERN_NOTICE, sdkp,
2927	"%llu %d-byte logical blocks: (%s/%s)\n",
2928	(unsigned long long)sdkp->capacity,
2929	sector_size, cap_str_10, cap_str_2);
2930
2931	if (sdkp->physical_block_size != sector_size)
2932	sd_printk(KERN_NOTICE, sdkp,
2933	"%u-byte physical blocks\n",
2934	sdkp->physical_block_size);
2935	}
2936
2937	/* called with buffer of length 512 */
2938	static inline int
2939	sd_do_mode_sense(struct scsi_disk *sdkp, int dbd, int modepage,
2940	unsigned char *buffer, int len, struct scsi_mode_data *data,
2941	struct scsi_sense_hdr *sshdr)
2942	{
2943	/*
2944	* If we must use MODE SENSE(10), make sure that the buffer length
2945	* is at least 8 bytes so that the mode sense header fits.
2946	*/
2947	if (sdkp->device->use_10_for_ms && len < 8)
2948	len = 8;
2949
2950	return scsi_mode_sense(sdev: sdkp->device, dbd, modepage, subpage: 0, buffer, len,
2951	SD_TIMEOUT, retries: sdkp->max_retries, data, sshdr);
2952	}
2953
2954	/*
2955	* read write protect setting, if possible - called only in sd_revalidate_disk()
2956	* called with buffer of length SD_BUF_SIZE
2957	*/
2958	static void
2959	sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2960	{
2961	int res;
2962	struct scsi_device *sdp = sdkp->device;
2963	struct scsi_mode_data data;
2964	int old_wp = sdkp->write_prot;
2965
2966	set_disk_ro(disk: sdkp->disk, read_only: 0);
2967	if (sdp->skip_ms_page_3f) {
2968	sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2969	return;
2970	}
2971
2972	if (sdp->use_192_bytes_for_3f) {
2973	res = sd_do_mode_sense(sdkp, dbd: 0, modepage: 0x3F, buffer, len: 192, data: &data, NULL);
2974	} else {
2975	/*
2976	* First attempt: ask for all pages (0x3F), but only 4 bytes.
2977	* We have to start carefully: some devices hang if we ask
2978	* for more than is available.
2979	*/
2980	res = sd_do_mode_sense(sdkp, dbd: 0, modepage: 0x3F, buffer, len: 4, data: &data, NULL);
2981
2982	/*
2983	* Second attempt: ask for page 0 When only page 0 is
2984	* implemented, a request for page 3F may return Sense Key
2985	* 5: Illegal Request, Sense Code 24: Invalid field in
2986	* CDB.
2987	*/
2988	if (res < 0)
2989	res = sd_do_mode_sense(sdkp, dbd: 0, modepage: 0, buffer, len: 4, data: &data, NULL);
2990
2991	/*
2992	* Third attempt: ask 255 bytes, as we did earlier.
2993	*/
2994	if (res < 0)
2995	res = sd_do_mode_sense(sdkp, dbd: 0, modepage: 0x3F, buffer, len: 255,
2996	data: &data, NULL);
2997	}
2998
2999	if (res < 0) {
3000	sd_first_printk(KERN_WARNING, sdkp,
3001	"Test WP failed, assume Write Enabled\n");
3002	} else {
3003	sdkp->write_prot = ((data.device_specific & 0x80) != 0);
3004	set_disk_ro(disk: sdkp->disk, read_only: sdkp->write_prot);
3005	if (sdkp->first_scan || old_wp != sdkp->write_prot) {
3006	sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
3007	sdkp->write_prot ? "on" : "off");
3008	sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
3009	}
3010	}
3011	}
3012
3013	/*
3014	* sd_read_cache_type - called only from sd_revalidate_disk()
3015	* called with buffer of length SD_BUF_SIZE
3016	*/
3017	static void
3018	sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
3019	{
3020	int len = 0, res;
3021	struct scsi_device *sdp = sdkp->device;
3022
3023	int dbd;
3024	int modepage;
3025	int first_len;
3026	struct scsi_mode_data data;
3027	struct scsi_sense_hdr sshdr;
3028	int old_wce = sdkp->WCE;
3029	int old_rcd = sdkp->RCD;
3030	int old_dpofua = sdkp->DPOFUA;
3031
3032
3033	if (sdkp->cache_override)
3034	return;
3035
3036	first_len = 4;
3037	if (sdp->skip_ms_page_8) {
3038	if (sdp->type == TYPE_RBC)
3039	goto defaults;
3040	else {
3041	if (sdp->skip_ms_page_3f)
3042	goto defaults;
3043	modepage = 0x3F;
3044	if (sdp->use_192_bytes_for_3f)
3045	first_len = 192;
3046	dbd = 0;
3047	}
3048	} else if (sdp->type == TYPE_RBC) {
3049	modepage = 6;
3050	dbd = 8;
3051	} else {
3052	modepage = 8;
3053	dbd = 0;
3054	}
3055
3056	/* cautiously ask */
3057	res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len: first_len,
3058	data: &data, sshdr: &sshdr);
3059
3060	if (res < 0)
3061	goto bad_sense;
3062
3063	if (!data.header_length) {
3064	modepage = 6;
3065	first_len = 0;
3066	sd_first_printk(KERN_ERR, sdkp,
3067	"Missing header in MODE_SENSE response\n");
3068	}
3069
3070	/* that went OK, now ask for the proper length */
3071	len = data.length;
3072
3073	/*
3074	* We're only interested in the first three bytes, actually.
3075	* But the data cache page is defined for the first 20.
3076	*/
3077	if (len < 3)
3078	goto bad_sense;
3079	else if (len > SD_BUF_SIZE) {
3080	sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
3081	"data from %d to %d bytes\n", len, SD_BUF_SIZE);
3082	len = SD_BUF_SIZE;
3083	}
3084	if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
3085	len = 192;
3086
3087	/* Get the data */
3088	if (len > first_len)
3089	res = sd_do_mode_sense(sdkp, dbd, modepage, buffer, len,
3090	data: &data, sshdr: &sshdr);
3091
3092	if (!res) {
3093	int offset = data.header_length + data.block_descriptor_length;
3094
3095	while (offset < len) {
3096	u8 page_code = buffer[offset] & 0x3F;
3097	u8 spf = buffer[offset] & 0x40;
3098
3099	if (page_code == 8 || page_code == 6) {
3100	/* We're interested only in the first 3 bytes.
3101	*/
3102	if (len - offset <= 2) {
3103	sd_first_printk(KERN_ERR, sdkp,
3104	"Incomplete mode parameter "
3105	"data\n");
3106	goto defaults;
3107	} else {
3108	modepage = page_code;
3109	goto Page_found;
3110	}
3111	} else {
3112	/* Go to the next page */
3113	if (spf && len - offset > 3)
3114	offset += 4 + (buffer[offset+2] << 8) +
3115	buffer[offset+3];
3116	else if (!spf && len - offset > 1)
3117	offset += 2 + buffer[offset+1];
3118	else {
3119	sd_first_printk(KERN_ERR, sdkp,
3120	"Incomplete mode "
3121	"parameter data\n");
3122	goto defaults;
3123	}
3124	}
3125	}
3126
3127	sd_first_printk(KERN_WARNING, sdkp,
3128	"No Caching mode page found\n");
3129	goto defaults;
3130
3131	Page_found:
3132	if (modepage == 8) {
3133	sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
3134	sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
3135	} else {
3136	sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
3137	sdkp->RCD = 0;
3138	}
3139
3140	sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
3141	if (sdp->broken_fua) {
3142	sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
3143	sdkp->DPOFUA = 0;
3144	} else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
3145	!sdkp->device->use_16_for_rw) {
3146	sd_first_printk(KERN_NOTICE, sdkp,
3147	"Uses READ/WRITE(6), disabling FUA\n");
3148	sdkp->DPOFUA = 0;
3149	}
3150
3151	/* No cache flush allowed for write protected devices */
3152	if (sdkp->WCE && sdkp->write_prot)
3153	sdkp->WCE = 0;
3154
3155	if (sdkp->first_scan || old_wce != sdkp->WCE ||
3156	old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
3157	sd_printk(KERN_NOTICE, sdkp,
3158	"Write cache: %s, read cache: %s, %s\n",
3159	sdkp->WCE ? "enabled" : "disabled",
3160	sdkp->RCD ? "disabled" : "enabled",
3161	sdkp->DPOFUA ? "supports DPO and FUA"
3162	: "doesn't support DPO or FUA");
3163
3164	return;
3165	}
3166
3167	bad_sense:
3168	if (res == -EIO && scsi_sense_valid(sshdr: &sshdr) &&
3169	sshdr.sense_key == ILLEGAL_REQUEST &&
3170	sshdr.asc == 0x24 && sshdr.ascq == 0x0)
3171	/* Invalid field in CDB */
3172	sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
3173	else
3174	sd_first_printk(KERN_ERR, sdkp,
3175	"Asking for cache data failed\n");
3176
3177	defaults:
3178	if (sdp->wce_default_on) {
3179	sd_first_printk(KERN_NOTICE, sdkp,
3180	"Assuming drive cache: write back\n");
3181	sdkp->WCE = 1;
3182	} else {
3183	sd_first_printk(KERN_WARNING, sdkp,
3184	"Assuming drive cache: write through\n");
3185	sdkp->WCE = 0;
3186	}
3187	sdkp->RCD = 0;
3188	sdkp->DPOFUA = 0;
3189	}
3190
3191	static bool sd_is_perm_stream(struct scsi_disk *sdkp, unsigned int stream_id)
3192	{
3193	u8 cdb[16] = { SERVICE_ACTION_IN_16, SAI_GET_STREAM_STATUS };
3194	struct {
3195	struct scsi_stream_status_header h;
3196	struct scsi_stream_status s;
3197	} buf;
3198	struct scsi_device *sdev = sdkp->device;
3199	struct scsi_sense_hdr sshdr;
3200	const struct scsi_exec_args exec_args = {
3201	.sshdr = &sshdr,
3202	};
3203	int res;
3204
3205	put_unaligned_be16(val: stream_id, p: &cdb[4]);
3206	put_unaligned_be32(val: sizeof(buf), p: &cdb[10]);
3207
3208	res = scsi_execute_cmd(sdev, cmd: cdb, opf: REQ_OP_DRV_IN, buffer: &buf, bufflen: sizeof(buf),
3209	SD_TIMEOUT, retries: sdkp->max_retries, args: &exec_args);
3210	if (res < 0)
3211	return false;
3212	if (scsi_status_is_check_condition(status: res) && scsi_sense_valid(sshdr: &sshdr))
3213	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
3214	if (res)
3215	return false;
3216	if (get_unaligned_be32(p: &buf.h.len) < sizeof(struct scsi_stream_status))
3217	return false;
3218	return buf.s.perm;
3219	}
3220
3221	static void sd_read_io_hints(struct scsi_disk *sdkp, unsigned char *buffer)
3222	{
3223	struct scsi_device *sdp = sdkp->device;
3224	const struct scsi_io_group_descriptor *desc, *start, *end;
3225	u16 permanent_stream_count_old;
3226	struct scsi_sense_hdr sshdr;
3227	struct scsi_mode_data data;
3228	int res;
3229
3230	if (sdp->sdev_bflags & BLIST_SKIP_IO_HINTS)
3231	return;
3232
3233	res = scsi_mode_sense(sdev: sdp, /*dbd=*/0x8, /*modepage=*/0x0a,
3234	/*subpage=*/0x05, buffer, SD_BUF_SIZE, SD_TIMEOUT,
3235	retries: sdkp->max_retries, data: &data, &sshdr);
3236	if (res < 0)
3237	return;
3238	start = (void *)buffer + data.header_length + 16;
3239	end = (void *)buffer + ALIGN_DOWN(data.header_length + data.length,
3240	sizeof(*end));
3241	/*
3242	* From "SBC-5 Constrained Streams with Data Lifetimes": Device severs
3243	* should assign the lowest numbered stream identifiers to permanent
3244	* streams.
3245	*/
3246	for (desc = start; desc < end; desc++)
3247	if (!desc->st_enble || !sd_is_perm_stream(sdkp, stream_id: desc - start))
3248	break;
3249	permanent_stream_count_old = sdkp->permanent_stream_count;
3250	sdkp->permanent_stream_count = desc - start;
3251	if (sdkp->rscs && sdkp->permanent_stream_count < 2)
3252	sd_printk(KERN_INFO, sdkp,
3253	"Unexpected: RSCS has been set and the permanent stream count is %u\n",
3254	sdkp->permanent_stream_count);
3255	else if (sdkp->permanent_stream_count != permanent_stream_count_old)
3256	sd_printk(KERN_INFO, sdkp, "permanent stream count = %d\n",
3257	sdkp->permanent_stream_count);
3258	}
3259
3260	/*
3261	* The ATO bit indicates whether the DIF application tag is available
3262	* for use by the operating system.
3263	*/
3264	static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
3265	{
3266	int res, offset;
3267	struct scsi_device *sdp = sdkp->device;
3268	struct scsi_mode_data data;
3269	struct scsi_sense_hdr sshdr;
3270
3271	if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
3272	return;
3273
3274	if (sdkp->protection_type == 0)
3275	return;
3276
3277	res = scsi_mode_sense(sdev: sdp, dbd: 1, modepage: 0x0a, subpage: 0, buffer, len: 36, SD_TIMEOUT,
3278	retries: sdkp->max_retries, data: &data, &sshdr);
3279
3280	if (res < 0 || !data.header_length ||
3281	data.length < 6) {
3282	sd_first_printk(KERN_WARNING, sdkp,
3283	"getting Control mode page failed, assume no ATO\n");
3284
3285	if (res == -EIO && scsi_sense_valid(sshdr: &sshdr))
3286	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
3287
3288	return;
3289	}
3290
3291	offset = data.header_length + data.block_descriptor_length;
3292
3293	if ((buffer[offset] & 0x3f) != 0x0a) {
3294	sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
3295	return;
3296	}
3297
3298	if ((buffer[offset + 5] & 0x80) == 0)
3299	return;
3300
3301	sdkp->ATO = 1;
3302
3303	return;
3304	}
3305
3306	static unsigned int sd_discard_mode(struct scsi_disk *sdkp)
3307	{
3308	if (!sdkp->lbpme)
3309	return SD_LBP_FULL;
3310
3311	if (!sdkp->lbpvpd) {
3312	/* LBP VPD page not provided */
3313	if (sdkp->max_unmap_blocks)
3314	return SD_LBP_UNMAP;
3315	return SD_LBP_WS16;
3316	}
3317
3318	/* LBP VPD page tells us what to use */
3319	if (sdkp->lbpu && sdkp->max_unmap_blocks)
3320	return SD_LBP_UNMAP;
3321	if (sdkp->lbpws)
3322	return SD_LBP_WS16;
3323	if (sdkp->lbpws10)
3324	return SD_LBP_WS10;
3325	return SD_LBP_DISABLE;
3326	}
3327
3328	/*
3329	* Query disk device for preferred I/O sizes.
3330	*/
3331	static void sd_read_block_limits(struct scsi_disk *sdkp,
3332	struct queue_limits *lim)
3333	{
3334	struct scsi_vpd *vpd;
3335
3336	rcu_read_lock();
3337
3338	vpd = rcu_dereference(sdkp->device->vpd_pgb0);
3339	if (!vpd || vpd->len < 16)
3340	goto out;
3341
3342	sdkp->min_xfer_blocks = get_unaligned_be16(p: &vpd->data[6]);
3343	sdkp->max_xfer_blocks = get_unaligned_be32(p: &vpd->data[8]);
3344	sdkp->opt_xfer_blocks = get_unaligned_be32(p: &vpd->data[12]);
3345
3346	if (vpd->len >= 64) {
3347	unsigned int lba_count, desc_count;
3348
3349	sdkp->max_ws_blocks = (u32)get_unaligned_be64(p: &vpd->data[36]);
3350
3351	if (!sdkp->lbpme)
3352	goto config_atomic;
3353
3354	lba_count = get_unaligned_be32(p: &vpd->data[20]);
3355	desc_count = get_unaligned_be32(p: &vpd->data[24]);
3356
3357	if (lba_count && desc_count)
3358	sdkp->max_unmap_blocks = lba_count;
3359
3360	sdkp->unmap_granularity = get_unaligned_be32(p: &vpd->data[28]);
3361
3362	if (vpd->data[32] & 0x80)
3363	sdkp->unmap_alignment =
3364	get_unaligned_be32(p: &vpd->data[32]) & ~(1 << 31);
3365
3366	config_atomic:
3367	sdkp->max_atomic = get_unaligned_be32(p: &vpd->data[44]);
3368	sdkp->atomic_alignment = get_unaligned_be32(p: &vpd->data[48]);
3369	sdkp->atomic_granularity = get_unaligned_be32(p: &vpd->data[52]);
3370	sdkp->max_atomic_with_boundary = get_unaligned_be32(p: &vpd->data[56]);
3371	sdkp->max_atomic_boundary = get_unaligned_be32(p: &vpd->data[60]);
3372
3373	sd_config_atomic(sdkp, lim);
3374	}
3375
3376	out:
3377	rcu_read_unlock();
3378	}
3379
3380	/* Parse the Block Limits Extension VPD page (0xb7) */
3381	static void sd_read_block_limits_ext(struct scsi_disk *sdkp)
3382	{
3383	struct scsi_vpd *vpd;
3384
3385	rcu_read_lock();
3386	vpd = rcu_dereference(sdkp->device->vpd_pgb7);
3387	if (vpd && vpd->len >= 2)
3388	sdkp->rscs = vpd->data[5] & 1;
3389	rcu_read_unlock();
3390	}
3391
3392	/* Query block device characteristics */
3393	static void sd_read_block_characteristics(struct scsi_disk *sdkp,
3394	struct queue_limits *lim)
3395	{
3396	struct scsi_vpd *vpd;
3397	u16 rot;
3398
3399	rcu_read_lock();
3400	vpd = rcu_dereference(sdkp->device->vpd_pgb1);
3401
3402	if (!vpd || vpd->len <= 8) {
3403	rcu_read_unlock();
3404	return;
3405	}
3406
3407	rot = get_unaligned_be16(p: &vpd->data[4]);
3408	sdkp->zoned = (vpd->data[8] >> 4) & 3;
3409	rcu_read_unlock();
3410
3411	if (rot == 1)
3412	lim->features &= ~(BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3413
3414	if (!sdkp->first_scan)
3415	return;
3416
3417	if (sdkp->device->type == TYPE_ZBC)
3418	sd_printk(KERN_NOTICE, sdkp, "Host-managed zoned block device\n");
3419	else if (sdkp->zoned == 1)
3420	sd_printk(KERN_NOTICE, sdkp, "Host-aware SMR disk used as regular disk\n");
3421	else if (sdkp->zoned == 2)
3422	sd_printk(KERN_NOTICE, sdkp, "Drive-managed SMR disk\n");
3423	}
3424
3425	/**
3426	* sd_read_block_provisioning - Query provisioning VPD page
3427	* @sdkp: disk to query
3428	*/
3429	static void sd_read_block_provisioning(struct scsi_disk *sdkp)
3430	{
3431	struct scsi_vpd *vpd;
3432
3433	if (sdkp->lbpme == 0)
3434	return;
3435
3436	rcu_read_lock();
3437	vpd = rcu_dereference(sdkp->device->vpd_pgb2);
3438
3439	if (!vpd || vpd->len < 8) {
3440	rcu_read_unlock();
3441	return;
3442	}
3443
3444	sdkp->lbpvpd = 1;
3445	sdkp->lbpu = (vpd->data[5] >> 7) & 1; /* UNMAP */
3446	sdkp->lbpws = (vpd->data[5] >> 6) & 1; /* WRITE SAME(16) w/ UNMAP */
3447	sdkp->lbpws10 = (vpd->data[5] >> 5) & 1; /* WRITE SAME(10) w/ UNMAP */
3448	rcu_read_unlock();
3449	}
3450
3451	static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3452	{
3453	struct scsi_device *sdev = sdkp->device;
3454
3455	if (sdev->host->no_write_same) {
3456	sdev->no_write_same = 1;
3457
3458	return;
3459	}
3460
3461	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY, sa: 0) < 0) {
3462	struct scsi_vpd *vpd;
3463
3464	sdev->no_report_opcodes = 1;
3465
3466	/* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3467	* CODES is unsupported and the device has an ATA
3468	* Information VPD page (SAT).
3469	*/
3470	rcu_read_lock();
3471	vpd = rcu_dereference(sdev->vpd_pg89);
3472	if (vpd)
3473	sdev->no_write_same = 1;
3474	rcu_read_unlock();
3475	}
3476
3477	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16, sa: 0) == 1)
3478	sdkp->ws16 = 1;
3479
3480	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME, sa: 0) == 1)
3481	sdkp->ws10 = 1;
3482	}
3483
3484	static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3485	{
3486	struct scsi_device *sdev = sdkp->device;
3487
3488	if (!sdev->security_supported)
3489	return;
3490
3491	if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3492	SECURITY_PROTOCOL_IN, sa: 0) == 1 &&
3493	scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3494	SECURITY_PROTOCOL_OUT, sa: 0) == 1)
3495	sdkp->security = 1;
3496	}
3497
3498	static inline sector_t sd64_to_sectors(struct scsi_disk *sdkp, u8 *buf)
3499	{
3500	return logical_to_sectors(sdev: sdkp->device, blocks: get_unaligned_be64(p: buf));
3501	}
3502
3503	/**
3504	* sd_read_cpr - Query concurrent positioning ranges
3505	* @sdkp: disk to query
3506	*/
3507	static void sd_read_cpr(struct scsi_disk *sdkp)
3508	{
3509	struct blk_independent_access_ranges *iars = NULL;
3510	unsigned char *buffer = NULL;
3511	unsigned int nr_cpr = 0;
3512	int i, vpd_len, buf_len = SD_BUF_SIZE;
3513	u8 *desc;
3514
3515	/*
3516	* We need to have the capacity set first for the block layer to be
3517	* able to check the ranges.
3518	*/
3519	if (sdkp->first_scan)
3520	return;
3521
3522	if (!sdkp->capacity)
3523	goto out;
3524
3525	/*
3526	* Concurrent Positioning Ranges VPD: there can be at most 256 ranges,
3527	* leading to a maximum page size of 64 + 256*32 bytes.
3528	*/
3529	buf_len = 64 + 256*32;
3530	buffer = kmalloc(buf_len, GFP_KERNEL);
3531	if (!buffer || scsi_get_vpd_page(sdkp->device, page: 0xb9, buf: buffer, buf_len))
3532	goto out;
3533
3534	/* We must have at least a 64B header and one 32B range descriptor */
3535	vpd_len = get_unaligned_be16(p: &buffer[2]) + 4;
3536	if (vpd_len > buf_len || vpd_len < 64 + 32 || (vpd_len & 31)) {
3537	sd_printk(KERN_ERR, sdkp,
3538	"Invalid Concurrent Positioning Ranges VPD page\n");
3539	goto out;
3540	}
3541
3542	nr_cpr = (vpd_len - 64) / 32;
3543	if (nr_cpr == 1) {
3544	nr_cpr = 0;
3545	goto out;
3546	}
3547
3548	iars = disk_alloc_independent_access_ranges(disk: sdkp->disk, nr_ia_ranges: nr_cpr);
3549	if (!iars) {
3550	nr_cpr = 0;
3551	goto out;
3552	}
3553
3554	desc = &buffer[64];
3555	for (i = 0; i < nr_cpr; i++, desc += 32) {
3556	if (desc[0] != i) {
3557	sd_printk(KERN_ERR, sdkp,
3558	"Invalid Concurrent Positioning Range number\n");
3559	nr_cpr = 0;
3560	break;
3561	}
3562
3563	iars->ia_range[i].sector = sd64_to_sectors(sdkp, buf: desc + 8);
3564	iars->ia_range[i].nr_sectors = sd64_to_sectors(sdkp, buf: desc + 16);
3565	}
3566
3567	out:
3568	disk_set_independent_access_ranges(disk: sdkp->disk, iars);
3569	if (nr_cpr && sdkp->nr_actuators != nr_cpr) {
3570	sd_printk(KERN_NOTICE, sdkp,
3571	"%u concurrent positioning ranges\n", nr_cpr);
3572	sdkp->nr_actuators = nr_cpr;
3573	}
3574
3575	kfree(objp: buffer);
3576	}
3577
3578	static bool sd_validate_min_xfer_size(struct scsi_disk *sdkp)
3579	{
3580	struct scsi_device *sdp = sdkp->device;
3581	unsigned int min_xfer_bytes =
3582	logical_to_bytes(sdev: sdp, blocks: sdkp->min_xfer_blocks);
3583
3584	if (sdkp->min_xfer_blocks == 0)
3585	return false;
3586
3587	if (min_xfer_bytes & (sdkp->physical_block_size - 1)) {
3588	sd_first_printk(KERN_WARNING, sdkp,
3589	"Preferred minimum I/O size %u bytes not a " \
3590	"multiple of physical block size (%u bytes)\n",
3591	min_xfer_bytes, sdkp->physical_block_size);
3592	sdkp->min_xfer_blocks = 0;
3593	return false;
3594	}
3595
3596	sd_first_printk(KERN_INFO, sdkp, "Preferred minimum I/O size %u bytes\n",
3597	min_xfer_bytes);
3598	return true;
3599	}
3600
3601	/*
3602	* Determine the device's preferred I/O size for reads and writes
3603	* unless the reported value is unreasonably small, large, not a
3604	* multiple of the physical block size, or simply garbage.
3605	*/
3606	static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
3607	unsigned int dev_max)
3608	{
3609	struct scsi_device *sdp = sdkp->device;
3610	unsigned int opt_xfer_bytes =
3611	logical_to_bytes(sdev: sdp, blocks: sdkp->opt_xfer_blocks);
3612	unsigned int min_xfer_bytes =
3613	logical_to_bytes(sdev: sdp, blocks: sdkp->min_xfer_blocks);
3614
3615	if (sdkp->opt_xfer_blocks == 0)
3616	return false;
3617
3618	if (sdkp->opt_xfer_blocks > dev_max) {
3619	sd_first_printk(KERN_WARNING, sdkp,
3620	"Optimal transfer size %u logical blocks " \
3621	"> dev_max (%u logical blocks)\n",
3622	sdkp->opt_xfer_blocks, dev_max);
3623	return false;
3624	}
3625
3626	if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
3627	sd_first_printk(KERN_WARNING, sdkp,
3628	"Optimal transfer size %u logical blocks " \
3629	"> sd driver limit (%u logical blocks)\n",
3630	sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
3631	return false;
3632	}
3633
3634	if (opt_xfer_bytes < PAGE_SIZE) {
3635	sd_first_printk(KERN_WARNING, sdkp,
3636	"Optimal transfer size %u bytes < " \
3637	"PAGE_SIZE (%u bytes)\n",
3638	opt_xfer_bytes, (unsigned int)PAGE_SIZE);
3639	return false;
3640	}
3641
3642	if (min_xfer_bytes && opt_xfer_bytes % min_xfer_bytes) {
3643	sd_first_printk(KERN_WARNING, sdkp,
3644	"Optimal transfer size %u bytes not a " \
3645	"multiple of preferred minimum block " \
3646	"size (%u bytes)\n",
3647	opt_xfer_bytes, min_xfer_bytes);
3648	return false;
3649	}
3650
3651	if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
3652	sd_first_printk(KERN_WARNING, sdkp,
3653	"Optimal transfer size %u bytes not a " \
3654	"multiple of physical block size (%u bytes)\n",
3655	opt_xfer_bytes, sdkp->physical_block_size);
3656	return false;
3657	}
3658
3659	sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
3660	opt_xfer_bytes);
3661	return true;
3662	}
3663
3664	static void sd_read_block_zero(struct scsi_disk *sdkp)
3665	{
3666	struct scsi_device *sdev = sdkp->device;
3667	unsigned int buf_len = sdev->sector_size;
3668	u8 *buffer, cmd[16] = { };
3669
3670	buffer = kmalloc(buf_len, GFP_KERNEL);
3671	if (!buffer)
3672	return;
3673
3674	if (sdev->use_16_for_rw) {
3675	cmd[0] = READ_16;
3676	put_unaligned_be64(val: 0, p: &cmd[2]); /* Logical block address 0 */
3677	put_unaligned_be32(val: 1, p: &cmd[10]);/* Transfer 1 logical block */
3678	} else {
3679	cmd[0] = READ_10;
3680	put_unaligned_be32(val: 0, p: &cmd[2]); /* Logical block address 0 */
3681	put_unaligned_be16(val: 1, p: &cmd[7]); /* Transfer 1 logical block */
3682	}
3683
3684	scsi_execute_cmd(sdev: sdkp->device, cmd, opf: REQ_OP_DRV_IN, buffer, bufflen: buf_len,
3685	SD_TIMEOUT, retries: sdkp->max_retries, NULL);
3686	kfree(objp: buffer);
3687	}
3688
3689	/**
3690	* sd_revalidate_disk - called the first time a new disk is seen,
3691	* performs disk spin up, read_capacity, etc.
3692	* @disk: struct gendisk we care about
3693	**/
3694	static int sd_revalidate_disk(struct gendisk *disk)
3695	{
3696	struct scsi_disk *sdkp = scsi_disk(disk);
3697	struct scsi_device *sdp = sdkp->device;
3698	sector_t old_capacity = sdkp->capacity;
3699	struct queue_limits lim;
3700	unsigned char *buffer;
3701	unsigned int dev_max;
3702	int err;
3703
3704	SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3705	"sd_revalidate_disk\n"));
3706
3707	/*
3708	* If the device is offline, don't try and read capacity or any
3709	* of the other niceties.
3710	*/
3711	if (!scsi_device_online(sdev: sdp))
3712	goto out;
3713
3714	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3715	if (!buffer) {
3716	sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3717	"allocation failure.\n");
3718	goto out;
3719	}
3720
3721	sd_spinup_disk(sdkp);
3722
3723	lim = queue_limits_start_update(q: sdkp->disk->queue);
3724
3725	/*
3726	* Without media there is no reason to ask; moreover, some devices
3727	* react badly if we do.
3728	*/
3729	if (sdkp->media_present) {
3730	sd_read_capacity(sdkp, lim: &lim, buffer);
3731	/*
3732	* Some USB/UAS devices return generic values for mode pages
3733	* until the media has been accessed. Trigger a READ operation
3734	* to force the device to populate mode pages.
3735	*/
3736	if (sdp->read_before_ms)
3737	sd_read_block_zero(sdkp);
3738	/*
3739	* set the default to rotational. All non-rotational devices
3740	* support the block characteristics VPD page, which will
3741	* cause this to be updated correctly and any device which
3742	* doesn't support it should be treated as rotational.
3743	*/
3744	lim.features |= (BLK_FEAT_ROTATIONAL | BLK_FEAT_ADD_RANDOM);
3745
3746	if (scsi_device_supports_vpd(sdev: sdp)) {
3747	sd_read_block_provisioning(sdkp);
3748	sd_read_block_limits(sdkp, lim: &lim);
3749	sd_read_block_limits_ext(sdkp);
3750	sd_read_block_characteristics(sdkp, lim: &lim);
3751	sd_zbc_read_zones(sdkp, lim: &lim, buf: buffer);
3752	}
3753
3754	sd_config_discard(sdkp, lim: &lim, mode: sd_discard_mode(sdkp));
3755
3756	sd_print_capacity(sdkp, old_capacity);
3757
3758	sd_read_write_protect_flag(sdkp, buffer);
3759	sd_read_cache_type(sdkp, buffer);
3760	sd_read_io_hints(sdkp, buffer);
3761	sd_read_app_tag_own(sdkp, buffer);
3762	sd_read_write_same(sdkp, buffer);
3763	sd_read_security(sdkp, buffer);
3764	sd_config_protection(sdkp, lim: &lim);
3765	}
3766
3767	/*
3768	* We now have all cache related info, determine how we deal
3769	* with flush requests.
3770	*/
3771	sd_set_flush_flag(sdkp, lim: &lim);
3772
3773	/* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3774	dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3775
3776	/* Some devices report a maximum block count for READ/WRITE requests. */
3777	dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3778	lim.max_dev_sectors = logical_to_sectors(sdev: sdp, blocks: dev_max);
3779
3780	if (sd_validate_min_xfer_size(sdkp))
3781	lim.io_min = logical_to_bytes(sdev: sdp, blocks: sdkp->min_xfer_blocks);
3782	else
3783	lim.io_min = 0;
3784
3785	/*
3786	* Limit default to SCSI host optimal sector limit if set. There may be
3787	* an impact on performance for when the size of a request exceeds this
3788	* host limit.
3789	*/
3790	lim.io_opt = sdp->host->opt_sectors << SECTOR_SHIFT;
3791	if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
3792	lim.io_opt = min_not_zero(lim.io_opt,
3793	logical_to_bytes(sdp, sdkp->opt_xfer_blocks));
3794	}
3795
3796	sdkp->first_scan = 0;
3797
3798	set_capacity_and_notify(disk, size: logical_to_sectors(sdev: sdp, blocks: sdkp->capacity));
3799	sd_config_write_same(sdkp, lim: &lim);
3800	kfree(objp: buffer);
3801
3802	err = queue_limits_commit_update_frozen(q: sdkp->disk->queue, lim: &lim);
3803	if (err)
3804	return err;
3805
3806	/*
3807	* Query concurrent positioning ranges after
3808	* queue_limits_commit_update() unlocked q->limits_lock to avoid
3809	* deadlock with q->sysfs_dir_lock and q->sysfs_lock.
3810	*/
3811	if (sdkp->media_present && scsi_device_supports_vpd(sdev: sdp))
3812	sd_read_cpr(sdkp);
3813
3814	/*
3815	* For a zoned drive, revalidating the zones can be done only once
3816	* the gendisk capacity is set. So if this fails, set back the gendisk
3817	* capacity to 0.
3818	*/
3819	if (sd_zbc_revalidate_zones(sdkp))
3820	set_capacity_and_notify(disk, size: 0);
3821
3822	out:
3823	return 0;
3824	}
3825
3826	/**
3827	* sd_unlock_native_capacity - unlock native capacity
3828	* @disk: struct gendisk to set capacity for
3829	*
3830	* Block layer calls this function if it detects that partitions
3831	* on @disk reach beyond the end of the device. If the SCSI host
3832	* implements ->unlock_native_capacity() method, it's invoked to
3833	* give it a chance to adjust the device capacity.
3834	*
3835	* CONTEXT:
3836	* Defined by block layer. Might sleep.
3837	*/
3838	static void sd_unlock_native_capacity(struct gendisk *disk)
3839	{
3840	struct scsi_device *sdev = scsi_disk(disk)->device;
3841
3842	if (sdev->host->hostt->unlock_native_capacity)
3843	sdev->host->hostt->unlock_native_capacity(sdev);
3844	}
3845
3846	/**
3847	* sd_format_disk_name - format disk name
3848	* @prefix: name prefix - ie. "sd" for SCSI disks
3849	* @index: index of the disk to format name for
3850	* @buf: output buffer
3851	* @buflen: length of the output buffer
3852	*
3853	* SCSI disk names starts at sda. The 26th device is sdz and the
3854	* 27th is sdaa. The last one for two lettered suffix is sdzz
3855	* which is followed by sdaaa.
3856	*
3857	* This is basically 26 base counting with one extra 'nil' entry
3858	* at the beginning from the second digit on and can be
3859	* determined using similar method as 26 base conversion with the
3860	* index shifted -1 after each digit is computed.
3861	*
3862	* CONTEXT:
3863	* Don't care.
3864	*
3865	* RETURNS:
3866	* 0 on success, -errno on failure.
3867	*/
3868	static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3869	{
3870	const int base = 'z' - 'a' + 1;
3871	char *begin = buf + strlen(prefix);
3872	char *end = buf + buflen;
3873	char *p;
3874	int unit;
3875
3876	p = end - 1;
3877	*p = '\0';
3878	unit = base;
3879	do {
3880	if (p == begin)
3881	return -EINVAL;
3882	*--p = 'a' + (index % unit);
3883	index = (index / unit) - 1;
3884	} while (index >= 0);
3885
3886	memmove(begin, p, end - p);
3887	memcpy(buf, prefix, strlen(prefix));
3888
3889	return 0;
3890	}
3891
3892	/**
3893	* sd_probe - called during driver initialization and whenever a
3894	* new scsi device is attached to the system. It is called once
3895	* for each scsi device (not just disks) present.
3896	* @dev: pointer to device object
3897	*
3898	* Returns 0 if successful (or not interested in this scsi device
3899	* (e.g. scanner)); 1 when there is an error.
3900	*
3901	* Note: this function is invoked from the scsi mid-level.
3902	* This function sets up the mapping between a given
3903	* <host,channel,id,lun> (found in sdp) and new device name
3904	* (e.g. /dev/sda). More precisely it is the block device major
3905	* and minor number that is chosen here.
3906	*
3907	* Assume sd_probe is not re-entrant (for time being)
3908	* Also think about sd_probe() and sd_remove() running coincidentally.
3909	**/
3910	static int sd_probe(struct device *dev)
3911	{
3912	struct scsi_device *sdp = to_scsi_device(dev);
3913	struct scsi_disk *sdkp;
3914	struct gendisk *gd;
3915	int index;
3916	int error;
3917
3918	scsi_autopm_get_device(sdp);
3919	error = -ENODEV;
3920	if (sdp->type != TYPE_DISK &&
3921	sdp->type != TYPE_ZBC &&
3922	sdp->type != TYPE_MOD &&
3923	sdp->type != TYPE_RBC)
3924	goto out;
3925
3926	if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) && sdp->type == TYPE_ZBC) {
3927	sdev_printk(KERN_WARNING, sdp,
3928	"Unsupported ZBC host-managed device.\n");
3929	goto out;
3930	}
3931
3932	SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3933	"sd_probe\n"));
3934
3935	error = -ENOMEM;
3936	sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3937	if (!sdkp)
3938	goto out;
3939
3940	gd = blk_mq_alloc_disk_for_queue(q: sdp->request_queue,
3941	lkclass: &sd_bio_compl_lkclass);
3942	if (!gd)
3943	goto out_free;
3944
3945	index = ida_alloc(ida: &sd_index_ida, GFP_KERNEL);
3946	if (index < 0) {
3947	sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3948	goto out_put;
3949	}
3950
3951	error = sd_format_disk_name(prefix: "sd", index, buf: gd->disk_name, DISK_NAME_LEN);
3952	if (error) {
3953	sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3954	goto out_free_index;
3955	}
3956
3957	sdkp->device = sdp;
3958	sdkp->disk = gd;
3959	sdkp->index = index;
3960	sdkp->max_retries = SD_MAX_RETRIES;
3961	atomic_set(v: &sdkp->openers, i: 0);
3962	atomic_set(v: &sdkp->device->ioerr_cnt, i: 0);
3963
3964	if (!sdp->request_queue->rq_timeout) {
3965	if (sdp->type != TYPE_MOD)
3966	blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3967	else
3968	blk_queue_rq_timeout(sdp->request_queue,
3969	SD_MOD_TIMEOUT);
3970	}
3971
3972	device_initialize(dev: &sdkp->disk_dev);
3973	sdkp->disk_dev.parent = get_device(dev);
3974	sdkp->disk_dev.class = &sd_disk_class;
3975	dev_set_name(dev: &sdkp->disk_dev, name: "%s", dev_name(dev));
3976
3977	error = device_add(dev: &sdkp->disk_dev);
3978	if (error) {
3979	put_device(dev: &sdkp->disk_dev);
3980	goto out;
3981	}
3982
3983	dev_set_drvdata(dev, data: sdkp);
3984
3985	gd->major = sd_major(major_idx: (index & 0xf0) >> 4);
3986	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3987	gd->minors = SD_MINORS;
3988
3989	gd->fops = &sd_fops;
3990	gd->private_data = sdkp;
3991
3992	/* defaults, until the device tells us otherwise */
3993	sdp->sector_size = 512;
3994	sdkp->capacity = 0;
3995	sdkp->media_present = 1;
3996	sdkp->write_prot = 0;
3997	sdkp->cache_override = 0;
3998	sdkp->WCE = 0;
3999	sdkp->RCD = 0;
4000	sdkp->ATO = 0;
4001	sdkp->first_scan = 1;
4002	sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
4003
4004	sd_revalidate_disk(disk: gd);
4005
4006	if (sdp->removable) {
4007	gd->flags |= GENHD_FL_REMOVABLE;
4008	gd->events |= DISK_EVENT_MEDIA_CHANGE;
4009	gd->event_flags = DISK_EVENT_FLAG_POLL | DISK_EVENT_FLAG_UEVENT;
4010	}
4011
4012	blk_pm_runtime_init(q: sdp->request_queue, dev);
4013	if (sdp->rpm_autosuspend) {
4014	pm_runtime_set_autosuspend_delay(dev,
4015	delay: sdp->host->rpm_autosuspend_delay);
4016	}
4017
4018	error = device_add_disk(parent: dev, disk: gd, NULL);
4019	if (error) {
4020	device_unregister(dev: &sdkp->disk_dev);
4021	put_disk(disk: gd);
4022	goto out;
4023	}
4024
4025	if (sdkp->security) {
4026	sdkp->opal_dev = init_opal_dev(data: sdkp, send_recv: &sd_sec_submit);
4027	if (sdkp->opal_dev)
4028	sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
4029	}
4030
4031	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
4032	sdp->removable ? "removable " : "");
4033	scsi_autopm_put_device(sdp);
4034
4035	return 0;
4036
4037	out_free_index:
4038	ida_free(&sd_index_ida, id: index);
4039	out_put:
4040	put_disk(disk: gd);
4041	out_free:
4042	kfree(objp: sdkp);
4043	out:
4044	scsi_autopm_put_device(sdp);
4045	return error;
4046	}
4047
4048	/**
4049	* sd_remove - called whenever a scsi disk (previously recognized by
4050	* sd_probe) is detached from the system. It is called (potentially
4051	* multiple times) during sd module unload.
4052	* @dev: pointer to device object
4053	*
4054	* Note: this function is invoked from the scsi mid-level.
4055	* This function potentially frees up a device name (e.g. /dev/sdc)
4056	* that could be re-used by a subsequent sd_probe().
4057	* This function is not called when the built-in sd driver is "exit-ed".
4058	**/
4059	static int sd_remove(struct device *dev)
4060	{
4061	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4062
4063	scsi_autopm_get_device(sdkp->device);
4064
4065	device_del(dev: &sdkp->disk_dev);
4066	del_gendisk(gp: sdkp->disk);
4067	if (!sdkp->suspended)
4068	sd_shutdown(dev);
4069
4070	put_disk(disk: sdkp->disk);
4071	return 0;
4072	}
4073
4074	static void scsi_disk_release(struct device *dev)
4075	{
4076	struct scsi_disk *sdkp = to_scsi_disk(dev);
4077
4078	ida_free(&sd_index_ida, id: sdkp->index);
4079	put_device(dev: &sdkp->device->sdev_gendev);
4080	free_opal_dev(dev: sdkp->opal_dev);
4081
4082	kfree(objp: sdkp);
4083	}
4084
4085	static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
4086	{
4087	unsigned char cmd[6] = { START_STOP }; /* START_VALID */
4088	struct scsi_sense_hdr sshdr;
4089	struct scsi_failure failure_defs[] = {
4090	{
4091	/* Power on, reset, or bus device reset occurred */
4092	.sense = UNIT_ATTENTION,
4093	.asc = 0x29,
4094	.ascq = 0,
4095	.result = SAM_STAT_CHECK_CONDITION,
4096	},
4097	{
4098	/* Power on occurred */
4099	.sense = UNIT_ATTENTION,
4100	.asc = 0x29,
4101	.ascq = 1,
4102	.result = SAM_STAT_CHECK_CONDITION,
4103	},
4104	{
4105	/* SCSI bus reset */
4106	.sense = UNIT_ATTENTION,
4107	.asc = 0x29,
4108	.ascq = 2,
4109	.result = SAM_STAT_CHECK_CONDITION,
4110	},
4111	{}
4112	};
4113	struct scsi_failures failures = {
4114	.total_allowed = 3,
4115	.failure_definitions = failure_defs,
4116	};
4117	const struct scsi_exec_args exec_args = {
4118	.sshdr = &sshdr,
4119	.req_flags = BLK_MQ_REQ_PM,
4120	.failures = &failures,
4121	};
4122	struct scsi_device *sdp = sdkp->device;
4123	int res;
4124
4125	if (start)
4126	cmd[4] |= 1; /* START */
4127
4128	if (sdp->start_stop_pwr_cond)
4129	cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
4130
4131	if (!scsi_device_online(sdev: sdp))
4132	return -ENODEV;
4133
4134	res = scsi_execute_cmd(sdev: sdp, cmd, opf: REQ_OP_DRV_IN, NULL, bufflen: 0, SD_TIMEOUT,
4135	retries: sdkp->max_retries, args: &exec_args);
4136	if (res) {
4137	sd_print_result(sdkp, msg: "Start/Stop Unit failed", result: res);
4138	if (res > 0 && scsi_sense_valid(sshdr: &sshdr)) {
4139	sd_print_sense_hdr(sdkp, sshdr: &sshdr);
4140	/* 0x3a is medium not present */
4141	if (sshdr.asc == 0x3a)
4142	res = 0;
4143	}
4144	}
4145
4146	/* SCSI error codes must not go to the generic layer */
4147	if (res)
4148	return -EIO;
4149
4150	return 0;
4151	}
4152
4153	/*
4154	* Send a SYNCHRONIZE CACHE instruction down to the device through
4155	* the normal SCSI command structure. Wait for the command to
4156	* complete.
4157	*/
4158	static void sd_shutdown(struct device *dev)
4159	{
4160	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4161
4162	if (!sdkp)
4163	return; /* this can happen */
4164
4165	if (pm_runtime_suspended(dev))
4166	return;
4167
4168	if (sdkp->WCE && sdkp->media_present) {
4169	sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4170	sd_sync_cache(sdkp);
4171	}
4172
4173	if ((system_state != SYSTEM_RESTART &&
4174	sdkp->device->manage_system_start_stop) ||
4175	(system_state == SYSTEM_POWER_OFF &&
4176	sdkp->device->manage_shutdown)) {
4177	sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4178	sd_start_stop_device(sdkp, start: 0);
4179	}
4180	}
4181
4182	static inline bool sd_do_start_stop(struct scsi_device *sdev, bool runtime)
4183	{
4184	return (sdev->manage_system_start_stop && !runtime) ||
4185	(sdev->manage_runtime_start_stop && runtime);
4186	}
4187
4188	static int sd_suspend_common(struct device *dev, bool runtime)
4189	{
4190	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4191	int ret = 0;
4192
4193	if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
4194	return 0;
4195
4196	if (sdkp->WCE && sdkp->media_present) {
4197	if (!sdkp->device->silence_suspend)
4198	sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
4199	ret = sd_sync_cache(sdkp);
4200	/* ignore OFFLINE device */
4201	if (ret == -ENODEV)
4202	return 0;
4203
4204	if (ret)
4205	return ret;
4206	}
4207
4208	if (sd_do_start_stop(sdev: sdkp->device, runtime)) {
4209	if (!sdkp->device->silence_suspend)
4210	sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
4211	/* an error is not worth aborting a system sleep */
4212	ret = sd_start_stop_device(sdkp, start: 0);
4213	if (!runtime)
4214	ret = 0;
4215	}
4216
4217	if (!ret)
4218	sdkp->suspended = true;
4219
4220	return ret;
4221	}
4222
4223	static int sd_suspend_system(struct device *dev)
4224	{
4225	if (pm_runtime_suspended(dev))
4226	return 0;
4227
4228	return sd_suspend_common(dev, runtime: false);
4229	}
4230
4231	static int sd_suspend_runtime(struct device *dev)
4232	{
4233	return sd_suspend_common(dev, runtime: true);
4234	}
4235
4236	static int sd_resume(struct device *dev)
4237	{
4238	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4239
4240	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4241
4242	if (opal_unlock_from_suspend(dev: sdkp->opal_dev)) {
4243	sd_printk(KERN_NOTICE, sdkp, "OPAL unlock failed\n");
4244	return -EIO;
4245	}
4246
4247	return 0;
4248	}
4249
4250	static int sd_resume_common(struct device *dev, bool runtime)
4251	{
4252	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4253	int ret;
4254
4255	if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
4256	return 0;
4257
4258	if (!sd_do_start_stop(sdev: sdkp->device, runtime)) {
4259	sdkp->suspended = false;
4260	return 0;
4261	}
4262
4263	sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
4264	ret = sd_start_stop_device(sdkp, start: 1);
4265	if (!ret) {
4266	sd_resume(dev);
4267	sdkp->suspended = false;
4268	}
4269
4270	return ret;
4271	}
4272
4273	static int sd_resume_system(struct device *dev)
4274	{
4275	if (pm_runtime_suspended(dev)) {
4276	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4277	struct scsi_device *sdp = sdkp ? sdkp->device : NULL;
4278
4279	if (sdp && sdp->force_runtime_start_on_system_start)
4280	pm_request_resume(dev);
4281
4282	return 0;
4283	}
4284
4285	return sd_resume_common(dev, runtime: false);
4286	}
4287
4288	static int sd_resume_runtime(struct device *dev)
4289	{
4290	struct scsi_disk *sdkp = dev_get_drvdata(dev);
4291	struct scsi_device *sdp;
4292
4293	if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
4294	return 0;
4295
4296	sdp = sdkp->device;
4297
4298	if (sdp->ignore_media_change) {
4299	/* clear the device's sense data */
4300	static const u8 cmd[10] = { REQUEST_SENSE };
4301	const struct scsi_exec_args exec_args = {
4302	.req_flags = BLK_MQ_REQ_PM,
4303	};
4304
4305	if (scsi_execute_cmd(sdev: sdp, cmd, opf: REQ_OP_DRV_IN, NULL, bufflen: 0,
4306	timeout: sdp->request_queue->rq_timeout, retries: 1,
4307	args: &exec_args))
4308	sd_printk(KERN_NOTICE, sdkp,
4309	"Failed to clear sense data\n");
4310	}
4311
4312	return sd_resume_common(dev, runtime: true);
4313	}
4314
4315	static const struct dev_pm_ops sd_pm_ops = {
4316	.suspend = sd_suspend_system,
4317	.resume = sd_resume_system,
4318	.poweroff = sd_suspend_system,
4319	.restore = sd_resume_system,
4320	.runtime_suspend = sd_suspend_runtime,
4321	.runtime_resume = sd_resume_runtime,
4322	};
4323
4324	static struct scsi_driver sd_template = {
4325	.gendrv = {
4326	.name = "sd",
4327	.probe = sd_probe,
4328	.probe_type = PROBE_PREFER_ASYNCHRONOUS,
4329	.remove = sd_remove,
4330	.shutdown = sd_shutdown,
4331	.pm = &sd_pm_ops,
4332	},
4333	.rescan = sd_rescan,
4334	.resume = sd_resume,
4335	.init_command = sd_init_command,
4336	.uninit_command = sd_uninit_command,
4337	.done = sd_done,
4338	.eh_action = sd_eh_action,
4339	.eh_reset = sd_eh_reset,
4340	};
4341
4342	/**
4343	* init_sd - entry point for this driver (both when built in or when
4344	* a module).
4345	*
4346	* Note: this function registers this driver with the scsi mid-level.
4347	**/
4348	static int __init init_sd(void)
4349	{
4350	int majors = 0, i, err;
4351
4352	SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
4353
4354	for (i = 0; i < SD_MAJORS; i++) {
4355	if (__register_blkdev(major: sd_major(major_idx: i), name: "sd", probe: sd_default_probe))
4356	continue;
4357	majors++;
4358	}
4359
4360	if (!majors)
4361	return -ENODEV;
4362
4363	err = class_register(class: &sd_disk_class);
4364	if (err)
4365	goto err_out;
4366
4367	sd_page_pool = mempool_create_page_pool(SD_MEMPOOL_SIZE, 0);
4368	if (!sd_page_pool) {
4369	printk(KERN_ERR "sd: can't init discard page pool\n");
4370	err = -ENOMEM;
4371	goto err_out_class;
4372	}
4373
4374	err = scsi_register_driver(&sd_template.gendrv);
4375	if (err)
4376	goto err_out_driver;
4377
4378	return 0;
4379
4380	err_out_driver:
4381	mempool_destroy(pool: sd_page_pool);
4382	err_out_class:
4383	class_unregister(class: &sd_disk_class);
4384	err_out:
4385	for (i = 0; i < SD_MAJORS; i++)
4386	unregister_blkdev(major: sd_major(major_idx: i), name: "sd");
4387	return err;
4388	}
4389
4390	/**
4391	* exit_sd - exit point for this driver (when it is a module).
4392	*
4393	* Note: this function unregisters this driver from the scsi mid-level.
4394	**/
4395	static void __exit exit_sd(void)
4396	{
4397	int i;
4398
4399	SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
4400
4401	scsi_unregister_driver(&sd_template.gendrv);
4402	mempool_destroy(pool: sd_page_pool);
4403
4404	class_unregister(class: &sd_disk_class);
4405
4406	for (i = 0; i < SD_MAJORS; i++)
4407	unregister_blkdev(major: sd_major(major_idx: i), name: "sd");
4408	}
4409
4410	module_init(init_sd);
4411	module_exit(exit_sd);
4412
4413	void sd_print_sense_hdr(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
4414	{
4415	scsi_print_sense_hdr(sdkp->device,
4416	sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
4417	}
4418
4419	void sd_print_result(const struct scsi_disk *sdkp, const char *msg, int result)
4420	{
4421	const char *hb_string = scsi_hostbyte_string(result);
4422
4423	if (hb_string)
4424	sd_printk(KERN_INFO, sdkp,
4425	"%s: Result: hostbyte=%s driverbyte=%s\n", msg,
4426	hb_string ? hb_string : "invalid",
4427	"DRIVER_OK");
4428	else
4429	sd_printk(KERN_INFO, sdkp,
4430	"%s: Result: hostbyte=0x%02x driverbyte=%s\n",
4431	msg, host_byte(result), "DRIVER_OK");
4432	}
4433