xref: /linux/drivers/scsi/scsi_debug.c (revision db6d8d5fdf9537641c76ba7f32e02b4bcc600972)
1 /*
2  * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
3  *  Copyright (C) 1992  Eric Youngdale
4  *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
5  *  to make sure that we are not getting blocks mixed up, and PANIC if
6  *  anything out of the ordinary is seen.
7  * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
8  *
9  * Copyright (C) 2001 - 2016 Douglas Gilbert
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2, or (at your option)
14  * any later version.
15  *
16  *  For documentation see http://sg.danny.cz/sg/sdebug26.html
17  *
18  */
19 
20 
21 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
22 
23 #include <linux/module.h>
24 
25 #include <linux/kernel.h>
26 #include <linux/errno.h>
27 #include <linux/jiffies.h>
28 #include <linux/slab.h>
29 #include <linux/types.h>
30 #include <linux/string.h>
31 #include <linux/genhd.h>
32 #include <linux/fs.h>
33 #include <linux/init.h>
34 #include <linux/proc_fs.h>
35 #include <linux/vmalloc.h>
36 #include <linux/moduleparam.h>
37 #include <linux/scatterlist.h>
38 #include <linux/blkdev.h>
39 #include <linux/crc-t10dif.h>
40 #include <linux/spinlock.h>
41 #include <linux/interrupt.h>
42 #include <linux/atomic.h>
43 #include <linux/hrtimer.h>
44 #include <linux/uuid.h>
45 #include <linux/t10-pi.h>
46 
47 #include <net/checksum.h>
48 
49 #include <asm/unaligned.h>
50 
51 #include <scsi/scsi.h>
52 #include <scsi/scsi_cmnd.h>
53 #include <scsi/scsi_device.h>
54 #include <scsi/scsi_host.h>
55 #include <scsi/scsicam.h>
56 #include <scsi/scsi_eh.h>
57 #include <scsi/scsi_tcq.h>
58 #include <scsi/scsi_dbg.h>
59 
60 #include "sd.h"
61 #include "scsi_logging.h"
62 
63 /* make sure inq_product_rev string corresponds to this version */
64 #define SDEBUG_VERSION "1.86"
65 static const char *sdebug_version_date = "20160430";
66 
67 #define MY_NAME "scsi_debug"
68 
69 /* Additional Sense Code (ASC) */
70 #define NO_ADDITIONAL_SENSE 0x0
71 #define LOGICAL_UNIT_NOT_READY 0x4
72 #define LOGICAL_UNIT_COMMUNICATION_FAILURE 0x8
73 #define UNRECOVERED_READ_ERR 0x11
74 #define PARAMETER_LIST_LENGTH_ERR 0x1a
75 #define INVALID_OPCODE 0x20
76 #define LBA_OUT_OF_RANGE 0x21
77 #define INVALID_FIELD_IN_CDB 0x24
78 #define INVALID_FIELD_IN_PARAM_LIST 0x26
79 #define UA_RESET_ASC 0x29
80 #define UA_CHANGED_ASC 0x2a
81 #define TARGET_CHANGED_ASC 0x3f
82 #define LUNS_CHANGED_ASCQ 0x0e
83 #define INSUFF_RES_ASC 0x55
84 #define INSUFF_RES_ASCQ 0x3
85 #define POWER_ON_RESET_ASCQ 0x0
86 #define BUS_RESET_ASCQ 0x2	/* scsi bus reset occurred */
87 #define MODE_CHANGED_ASCQ 0x1	/* mode parameters changed */
88 #define CAPACITY_CHANGED_ASCQ 0x9
89 #define SAVING_PARAMS_UNSUP 0x39
90 #define TRANSPORT_PROBLEM 0x4b
91 #define THRESHOLD_EXCEEDED 0x5d
92 #define LOW_POWER_COND_ON 0x5e
93 #define MISCOMPARE_VERIFY_ASC 0x1d
94 #define MICROCODE_CHANGED_ASCQ 0x1	/* with TARGET_CHANGED_ASC */
95 #define MICROCODE_CHANGED_WO_RESET_ASCQ 0x16
96 
97 /* Additional Sense Code Qualifier (ASCQ) */
98 #define ACK_NAK_TO 0x3
99 
100 /* Default values for driver parameters */
101 #define DEF_NUM_HOST   1
102 #define DEF_NUM_TGTS   1
103 #define DEF_MAX_LUNS   1
104 /* With these defaults, this driver will make 1 host with 1 target
105  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
106  */
107 #define DEF_ATO 1
108 #define DEF_JDELAY   1		/* if > 0 unit is a jiffy */
109 #define DEF_DEV_SIZE_MB   8
110 #define DEF_DIF 0
111 #define DEF_DIX 0
112 #define DEF_D_SENSE   0
113 #define DEF_EVERY_NTH   0
114 #define DEF_FAKE_RW	0
115 #define DEF_GUARD 0
116 #define DEF_HOST_LOCK 0
117 #define DEF_LBPU 0
118 #define DEF_LBPWS 0
119 #define DEF_LBPWS10 0
120 #define DEF_LBPRZ 1
121 #define DEF_LOWEST_ALIGNED 0
122 #define DEF_NDELAY   0		/* if > 0 unit is a nanosecond */
123 #define DEF_NO_LUN_0   0
124 #define DEF_NUM_PARTS   0
125 #define DEF_OPTS   0
126 #define DEF_OPT_BLKS 1024
127 #define DEF_PHYSBLK_EXP 0
128 #define DEF_PTYPE   TYPE_DISK
129 #define DEF_REMOVABLE false
130 #define DEF_SCSI_LEVEL   7    /* INQUIRY, byte2 [6->SPC-4; 7->SPC-5] */
131 #define DEF_SECTOR_SIZE 512
132 #define DEF_UNMAP_ALIGNMENT 0
133 #define DEF_UNMAP_GRANULARITY 1
134 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
135 #define DEF_UNMAP_MAX_DESC 256
136 #define DEF_VIRTUAL_GB   0
137 #define DEF_VPD_USE_HOSTNO 1
138 #define DEF_WRITESAME_LENGTH 0xFFFF
139 #define DEF_STRICT 0
140 #define DEF_STATISTICS false
141 #define DEF_SUBMIT_QUEUES 1
142 #define DEF_UUID_CTL 0
143 #define JDELAY_OVERRIDDEN -9999
144 
145 #define SDEBUG_LUN_0_VAL 0
146 
147 /* bit mask values for sdebug_opts */
148 #define SDEBUG_OPT_NOISE		1
149 #define SDEBUG_OPT_MEDIUM_ERR		2
150 #define SDEBUG_OPT_TIMEOUT		4
151 #define SDEBUG_OPT_RECOVERED_ERR	8
152 #define SDEBUG_OPT_TRANSPORT_ERR	16
153 #define SDEBUG_OPT_DIF_ERR		32
154 #define SDEBUG_OPT_DIX_ERR		64
155 #define SDEBUG_OPT_MAC_TIMEOUT		128
156 #define SDEBUG_OPT_SHORT_TRANSFER	0x100
157 #define SDEBUG_OPT_Q_NOISE		0x200
158 #define SDEBUG_OPT_ALL_TSF		0x400
159 #define SDEBUG_OPT_RARE_TSF		0x800
160 #define SDEBUG_OPT_N_WCE		0x1000
161 #define SDEBUG_OPT_RESET_NOISE		0x2000
162 #define SDEBUG_OPT_NO_CDB_NOISE		0x4000
163 #define SDEBUG_OPT_ALL_NOISE (SDEBUG_OPT_NOISE | SDEBUG_OPT_Q_NOISE | \
164 			      SDEBUG_OPT_RESET_NOISE)
165 #define SDEBUG_OPT_ALL_INJECTING (SDEBUG_OPT_RECOVERED_ERR | \
166 				  SDEBUG_OPT_TRANSPORT_ERR | \
167 				  SDEBUG_OPT_DIF_ERR | SDEBUG_OPT_DIX_ERR | \
168 				  SDEBUG_OPT_SHORT_TRANSFER)
169 /* When "every_nth" > 0 then modulo "every_nth" commands:
170  *   - a missing response is simulated if SDEBUG_OPT_TIMEOUT is set
171  *   - a RECOVERED_ERROR is simulated on successful read and write
172  *     commands if SDEBUG_OPT_RECOVERED_ERR is set.
173  *   - a TRANSPORT_ERROR is simulated on successful read and write
174  *     commands if SDEBUG_OPT_TRANSPORT_ERR is set.
175  *
176  * When "every_nth" < 0 then after "- every_nth" commands:
177  *   - a missing response is simulated if SDEBUG_OPT_TIMEOUT is set
178  *   - a RECOVERED_ERROR is simulated on successful read and write
179  *     commands if SDEBUG_OPT_RECOVERED_ERR is set.
180  *   - a TRANSPORT_ERROR is simulated on successful read and write
181  *     commands if _DEBUG_OPT_TRANSPORT_ERR is set.
182  * This will continue on every subsequent command until some other action
183  * occurs (e.g. the user * writing a new value (other than -1 or 1) to
184  * every_nth via sysfs).
185  */
186 
187 /* As indicated in SAM-5 and SPC-4 Unit Attentions (UAs) are returned in
188  * priority order. In the subset implemented here lower numbers have higher
189  * priority. The UA numbers should be a sequence starting from 0 with
190  * SDEBUG_NUM_UAS being 1 higher than the highest numbered UA. */
191 #define SDEBUG_UA_POR 0		/* Power on, reset, or bus device reset */
192 #define SDEBUG_UA_BUS_RESET 1
193 #define SDEBUG_UA_MODE_CHANGED 2
194 #define SDEBUG_UA_CAPACITY_CHANGED 3
195 #define SDEBUG_UA_LUNS_CHANGED 4
196 #define SDEBUG_UA_MICROCODE_CHANGED 5	/* simulate firmware change */
197 #define SDEBUG_UA_MICROCODE_CHANGED_WO_RESET 6
198 #define SDEBUG_NUM_UAS 7
199 
200 /* when 1==SDEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
201  * sector on read commands: */
202 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
203 #define OPT_MEDIUM_ERR_NUM    10     /* number of consecutive medium errs */
204 
205 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
206  * or "peripheral device" addressing (value 0) */
207 #define SAM2_LUN_ADDRESS_METHOD 0
208 
209 /* SDEBUG_CANQUEUE is the maximum number of commands that can be queued
210  * (for response) per submit queue at one time. Can be reduced by max_queue
211  * option. Command responses are not queued when jdelay=0 and ndelay=0. The
212  * per-device DEF_CMD_PER_LUN can be changed via sysfs:
213  * /sys/class/scsi_device/<h:c:t:l>/device/queue_depth
214  * but cannot exceed SDEBUG_CANQUEUE .
215  */
216 #define SDEBUG_CANQUEUE_WORDS  3	/* a WORD is bits in a long */
217 #define SDEBUG_CANQUEUE  (SDEBUG_CANQUEUE_WORDS * BITS_PER_LONG)
218 #define DEF_CMD_PER_LUN  255
219 
220 #define F_D_IN			1
221 #define F_D_OUT			2
222 #define F_D_OUT_MAYBE		4	/* WRITE SAME, NDOB bit */
223 #define F_D_UNKN		8
224 #define F_RL_WLUN_OK		0x10
225 #define F_SKIP_UA		0x20
226 #define F_DELAY_OVERR		0x40
227 #define F_SA_LOW		0x80	/* cdb byte 1, bits 4 to 0 */
228 #define F_SA_HIGH		0x100	/* as used by variable length cdbs */
229 #define F_INV_OP		0x200
230 #define F_FAKE_RW		0x400
231 #define F_M_ACCESS		0x800	/* media access */
232 
233 #define FF_RESPOND (F_RL_WLUN_OK | F_SKIP_UA | F_DELAY_OVERR)
234 #define FF_DIRECT_IO (F_M_ACCESS | F_FAKE_RW)
235 #define FF_SA (F_SA_HIGH | F_SA_LOW)
236 
237 #define SDEBUG_MAX_PARTS 4
238 
239 #define SDEBUG_MAX_CMD_LEN 32
240 
241 
242 struct sdebug_dev_info {
243 	struct list_head dev_list;
244 	unsigned int channel;
245 	unsigned int target;
246 	u64 lun;
247 	uuid_be lu_name;
248 	struct sdebug_host_info *sdbg_host;
249 	unsigned long uas_bm[1];
250 	atomic_t num_in_q;
251 	atomic_t stopped;
252 	bool used;
253 };
254 
255 struct sdebug_host_info {
256 	struct list_head host_list;
257 	struct Scsi_Host *shost;
258 	struct device dev;
259 	struct list_head dev_info_list;
260 };
261 
262 #define to_sdebug_host(d)	\
263 	container_of(d, struct sdebug_host_info, dev)
264 
265 struct sdebug_defer {
266 	struct hrtimer hrt;
267 	struct execute_work ew;
268 	int sqa_idx;	/* index of sdebug_queue array */
269 	int qc_idx;	/* index of sdebug_queued_cmd array within sqa_idx */
270 	int issuing_cpu;
271 };
272 
273 struct sdebug_queued_cmd {
274 	/* corresponding bit set in in_use_bm[] in owning struct sdebug_queue
275 	 * instance indicates this slot is in use.
276 	 */
277 	struct sdebug_defer *sd_dp;
278 	struct scsi_cmnd *a_cmnd;
279 	unsigned int inj_recovered:1;
280 	unsigned int inj_transport:1;
281 	unsigned int inj_dif:1;
282 	unsigned int inj_dix:1;
283 	unsigned int inj_short:1;
284 };
285 
286 struct sdebug_queue {
287 	struct sdebug_queued_cmd qc_arr[SDEBUG_CANQUEUE];
288 	unsigned long in_use_bm[SDEBUG_CANQUEUE_WORDS];
289 	spinlock_t qc_lock;
290 	atomic_t blocked;	/* to temporarily stop more being queued */
291 };
292 
293 static atomic_t sdebug_cmnd_count;   /* number of incoming commands */
294 static atomic_t sdebug_completions;  /* count of deferred completions */
295 static atomic_t sdebug_miss_cpus;    /* submission + completion cpus differ */
296 static atomic_t sdebug_a_tsf;	     /* 'almost task set full' counter */
297 
298 struct opcode_info_t {
299 	u8 num_attached;	/* 0 if this is it (i.e. a leaf); use 0xff */
300 				/* for terminating element */
301 	u8 opcode;		/* if num_attached > 0, preferred */
302 	u16 sa;			/* service action */
303 	u32 flags;		/* OR-ed set of SDEB_F_* */
304 	int (*pfp)(struct scsi_cmnd *, struct sdebug_dev_info *);
305 	const struct opcode_info_t *arrp;  /* num_attached elements or NULL */
306 	u8 len_mask[16];	/* len=len_mask[0], then mask for cdb[1]... */
307 				/* ignore cdb bytes after position 15 */
308 };
309 
310 /* SCSI opcodes (first byte of cdb) of interest mapped onto these indexes */
311 enum sdeb_opcode_index {
312 	SDEB_I_INVALID_OPCODE =	0,
313 	SDEB_I_INQUIRY = 1,
314 	SDEB_I_REPORT_LUNS = 2,
315 	SDEB_I_REQUEST_SENSE = 3,
316 	SDEB_I_TEST_UNIT_READY = 4,
317 	SDEB_I_MODE_SENSE = 5,		/* 6, 10 */
318 	SDEB_I_MODE_SELECT = 6,		/* 6, 10 */
319 	SDEB_I_LOG_SENSE = 7,
320 	SDEB_I_READ_CAPACITY = 8,	/* 10; 16 is in SA_IN(16) */
321 	SDEB_I_READ = 9,		/* 6, 10, 12, 16 */
322 	SDEB_I_WRITE = 10,		/* 6, 10, 12, 16 */
323 	SDEB_I_START_STOP = 11,
324 	SDEB_I_SERV_ACT_IN = 12,	/* 12, 16 */
325 	SDEB_I_SERV_ACT_OUT = 13,	/* 12, 16 */
326 	SDEB_I_MAINT_IN = 14,
327 	SDEB_I_MAINT_OUT = 15,
328 	SDEB_I_VERIFY = 16,		/* 10 only */
329 	SDEB_I_VARIABLE_LEN = 17,
330 	SDEB_I_RESERVE = 18,		/* 6, 10 */
331 	SDEB_I_RELEASE = 19,		/* 6, 10 */
332 	SDEB_I_ALLOW_REMOVAL = 20,	/* PREVENT ALLOW MEDIUM REMOVAL */
333 	SDEB_I_REZERO_UNIT = 21,	/* REWIND in SSC */
334 	SDEB_I_ATA_PT = 22,		/* 12, 16 */
335 	SDEB_I_SEND_DIAG = 23,
336 	SDEB_I_UNMAP = 24,
337 	SDEB_I_XDWRITEREAD = 25,	/* 10 only */
338 	SDEB_I_WRITE_BUFFER = 26,
339 	SDEB_I_WRITE_SAME = 27,		/* 10, 16 */
340 	SDEB_I_SYNC_CACHE = 28,		/* 10 only */
341 	SDEB_I_COMP_WRITE = 29,
342 	SDEB_I_LAST_ELEMENT = 30,	/* keep this last */
343 };
344 
345 
346 static const unsigned char opcode_ind_arr[256] = {
347 /* 0x0; 0x0->0x1f: 6 byte cdbs */
348 	SDEB_I_TEST_UNIT_READY, SDEB_I_REZERO_UNIT, 0, SDEB_I_REQUEST_SENSE,
349 	    0, 0, 0, 0,
350 	SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, 0,
351 	0, 0, SDEB_I_INQUIRY, 0, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE,
352 	    SDEB_I_RELEASE,
353 	0, 0, SDEB_I_MODE_SENSE, SDEB_I_START_STOP, 0, SDEB_I_SEND_DIAG,
354 	    SDEB_I_ALLOW_REMOVAL, 0,
355 /* 0x20; 0x20->0x3f: 10 byte cdbs */
356 	0, 0, 0, 0, 0, SDEB_I_READ_CAPACITY, 0, 0,
357 	SDEB_I_READ, 0, SDEB_I_WRITE, 0, 0, 0, 0, SDEB_I_VERIFY,
358 	0, 0, 0, 0, 0, SDEB_I_SYNC_CACHE, 0, 0,
359 	0, 0, 0, SDEB_I_WRITE_BUFFER, 0, 0, 0, 0,
360 /* 0x40; 0x40->0x5f: 10 byte cdbs */
361 	0, SDEB_I_WRITE_SAME, SDEB_I_UNMAP, 0, 0, 0, 0, 0,
362 	0, 0, 0, 0, 0, SDEB_I_LOG_SENSE, 0, 0,
363 	0, 0, 0, SDEB_I_XDWRITEREAD, 0, SDEB_I_MODE_SELECT, SDEB_I_RESERVE,
364 	    SDEB_I_RELEASE,
365 	0, 0, SDEB_I_MODE_SENSE, 0, 0, 0, 0, 0,
366 /* 0x60; 0x60->0x7d are reserved, 0x7e is "extended cdb" */
367 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
368 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
369 	0, SDEB_I_VARIABLE_LEN,
370 /* 0x80; 0x80->0x9f: 16 byte cdbs */
371 	0, 0, 0, 0, 0, SDEB_I_ATA_PT, 0, 0,
372 	SDEB_I_READ, SDEB_I_COMP_WRITE, SDEB_I_WRITE, 0, 0, 0, 0, 0,
373 	0, 0, 0, SDEB_I_WRITE_SAME, 0, 0, 0, 0,
374 	0, 0, 0, 0, 0, 0, SDEB_I_SERV_ACT_IN, SDEB_I_SERV_ACT_OUT,
375 /* 0xa0; 0xa0->0xbf: 12 byte cdbs */
376 	SDEB_I_REPORT_LUNS, SDEB_I_ATA_PT, 0, SDEB_I_MAINT_IN,
377 	     SDEB_I_MAINT_OUT, 0, 0, 0,
378 	SDEB_I_READ, SDEB_I_SERV_ACT_OUT, SDEB_I_WRITE, SDEB_I_SERV_ACT_IN,
379 	     0, 0, 0, 0,
380 	0, 0, 0, 0, 0, 0, 0, 0,
381 	0, 0, 0, 0, 0, 0, 0, 0,
382 /* 0xc0; 0xc0->0xff: vendor specific */
383 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
384 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
385 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
386 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
387 };
388 
389 static int resp_inquiry(struct scsi_cmnd *, struct sdebug_dev_info *);
390 static int resp_report_luns(struct scsi_cmnd *, struct sdebug_dev_info *);
391 static int resp_requests(struct scsi_cmnd *, struct sdebug_dev_info *);
392 static int resp_mode_sense(struct scsi_cmnd *, struct sdebug_dev_info *);
393 static int resp_mode_select(struct scsi_cmnd *, struct sdebug_dev_info *);
394 static int resp_log_sense(struct scsi_cmnd *, struct sdebug_dev_info *);
395 static int resp_readcap(struct scsi_cmnd *, struct sdebug_dev_info *);
396 static int resp_read_dt0(struct scsi_cmnd *, struct sdebug_dev_info *);
397 static int resp_write_dt0(struct scsi_cmnd *, struct sdebug_dev_info *);
398 static int resp_start_stop(struct scsi_cmnd *, struct sdebug_dev_info *);
399 static int resp_readcap16(struct scsi_cmnd *, struct sdebug_dev_info *);
400 static int resp_get_lba_status(struct scsi_cmnd *, struct sdebug_dev_info *);
401 static int resp_report_tgtpgs(struct scsi_cmnd *, struct sdebug_dev_info *);
402 static int resp_unmap(struct scsi_cmnd *, struct sdebug_dev_info *);
403 static int resp_rsup_opcodes(struct scsi_cmnd *, struct sdebug_dev_info *);
404 static int resp_rsup_tmfs(struct scsi_cmnd *, struct sdebug_dev_info *);
405 static int resp_write_same_10(struct scsi_cmnd *, struct sdebug_dev_info *);
406 static int resp_write_same_16(struct scsi_cmnd *, struct sdebug_dev_info *);
407 static int resp_xdwriteread_10(struct scsi_cmnd *, struct sdebug_dev_info *);
408 static int resp_comp_write(struct scsi_cmnd *, struct sdebug_dev_info *);
409 static int resp_write_buffer(struct scsi_cmnd *, struct sdebug_dev_info *);
410 
411 static const struct opcode_info_t msense_iarr[1] = {
412 	{0, 0x1a, 0, F_D_IN, NULL, NULL,
413 	    {6,  0xe8, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
414 };
415 
416 static const struct opcode_info_t mselect_iarr[1] = {
417 	{0, 0x15, 0, F_D_OUT, NULL, NULL,
418 	    {6,  0xf1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
419 };
420 
421 static const struct opcode_info_t read_iarr[3] = {
422 	{0, 0x28, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL,/* READ(10) */
423 	    {10,  0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0,
424 	     0, 0, 0, 0} },
425 	{0, 0x8, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL, /* READ(6) */
426 	    {6,  0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
427 	{0, 0xa8, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, NULL,/* READ(12) */
428 	    {12,  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x9f,
429 	     0xc7, 0, 0, 0, 0} },
430 };
431 
432 static const struct opcode_info_t write_iarr[3] = {
433 	{0, 0x2a, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL,   /* 10 */
434 	    {10,  0xfb, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0,
435 	     0, 0, 0, 0} },
436 	{0, 0xa, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL,    /* 6 */
437 	    {6,  0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
438 	{0, 0xaa, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, NULL,   /* 12 */
439 	    {12,  0xfb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x9f,
440 	     0xc7, 0, 0, 0, 0} },
441 };
442 
443 static const struct opcode_info_t sa_in_iarr[1] = {
444 	{0, 0x9e, 0x12, F_SA_LOW | F_D_IN, resp_get_lba_status, NULL,
445 	    {16,  0x12, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
446 	     0xff, 0xff, 0xff, 0, 0xc7} },
447 };
448 
449 static const struct opcode_info_t vl_iarr[1] = {	/* VARIABLE LENGTH */
450 	{0, 0x7f, 0xb, F_SA_HIGH | F_D_OUT | FF_DIRECT_IO, resp_write_dt0,
451 	    NULL, {32,  0xc7, 0, 0, 0, 0, 0x1f, 0x18, 0x0, 0xb, 0xfa,
452 		   0, 0xff, 0xff, 0xff, 0xff} },	/* WRITE(32) */
453 };
454 
455 static const struct opcode_info_t maint_in_iarr[2] = {
456 	{0, 0xa3, 0xc, F_SA_LOW | F_D_IN, resp_rsup_opcodes, NULL,
457 	    {12,  0xc, 0x87, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0,
458 	     0xc7, 0, 0, 0, 0} },
459 	{0, 0xa3, 0xd, F_SA_LOW | F_D_IN, resp_rsup_tmfs, NULL,
460 	    {12,  0xd, 0x80, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0,
461 	     0, 0} },
462 };
463 
464 static const struct opcode_info_t write_same_iarr[1] = {
465 	{0, 0x93, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, resp_write_same_16, NULL,
466 	    {16,  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
467 	     0xff, 0xff, 0xff, 0x1f, 0xc7} },
468 };
469 
470 static const struct opcode_info_t reserve_iarr[1] = {
471 	{0, 0x16, 0, F_D_OUT, NULL, NULL,	/* RESERVE(6) */
472 	    {6,  0x1f, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
473 };
474 
475 static const struct opcode_info_t release_iarr[1] = {
476 	{0, 0x17, 0, F_D_OUT, NULL, NULL,	/* RELEASE(6) */
477 	    {6,  0x1f, 0xff, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
478 };
479 
480 
481 /* This array is accessed via SDEB_I_* values. Make sure all are mapped,
482  * plus the terminating elements for logic that scans this table such as
483  * REPORT SUPPORTED OPERATION CODES. */
484 static const struct opcode_info_t opcode_info_arr[SDEB_I_LAST_ELEMENT + 1] = {
485 /* 0 */
486 	{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL,
487 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
488 	{0, 0x12, 0, FF_RESPOND | F_D_IN, resp_inquiry, NULL,
489 	    {6,  0xe3, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
490 	{0, 0xa0, 0, FF_RESPOND | F_D_IN, resp_report_luns, NULL,
491 	    {12,  0xe3, 0xff, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0,
492 	     0, 0} },
493 	{0, 0x3, 0, FF_RESPOND | F_D_IN, resp_requests, NULL,
494 	    {6,  0xe1, 0, 0, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
495 	{0, 0x0, 0, F_M_ACCESS | F_RL_WLUN_OK, NULL, NULL,/* TEST UNIT READY */
496 	    {6,  0, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
497 	{1, 0x5a, 0, F_D_IN, resp_mode_sense, msense_iarr,
498 	    {10,  0xf8, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0,
499 	     0} },
500 	{1, 0x55, 0, F_D_OUT, resp_mode_select, mselect_iarr,
501 	    {10,  0xf1, 0, 0, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} },
502 	{0, 0x4d, 0, F_D_IN, resp_log_sense, NULL,
503 	    {10,  0xe3, 0xff, 0xff, 0, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0, 0,
504 	     0, 0, 0} },
505 	{0, 0x25, 0, F_D_IN, resp_readcap, NULL,
506 	    {10,  0xe1, 0xff, 0xff, 0xff, 0xff, 0, 0, 0x1, 0xc7, 0, 0, 0, 0,
507 	     0, 0} },
508 	{3, 0x88, 0, F_D_IN | FF_DIRECT_IO, resp_read_dt0, read_iarr,
509 	    {16,  0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
510 	     0xff, 0xff, 0xff, 0x9f, 0xc7} },		/* READ(16) */
511 /* 10 */
512 	{3, 0x8a, 0, F_D_OUT | FF_DIRECT_IO, resp_write_dt0, write_iarr,
513 	    {16,  0xfa, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
514 	     0xff, 0xff, 0xff, 0x9f, 0xc7} },		/* WRITE(16) */
515 	{0, 0x1b, 0, 0, resp_start_stop, NULL,		/* START STOP UNIT */
516 	    {6,  0x1, 0, 0xf, 0xf7, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
517 	{1, 0x9e, 0x10, F_SA_LOW | F_D_IN, resp_readcap16, sa_in_iarr,
518 	    {16,  0x10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
519 	     0xff, 0xff, 0xff, 0x1, 0xc7} },	/* READ CAPACITY(16) */
520 	{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* SA OUT */
521 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
522 	{2, 0xa3, 0xa, F_SA_LOW | F_D_IN, resp_report_tgtpgs, maint_in_iarr,
523 	    {12,  0xea, 0, 0, 0, 0, 0xff, 0xff, 0xff, 0xff, 0, 0xc7, 0, 0, 0,
524 	     0} },
525 	{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* MAINT OUT */
526 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
527 	{0, 0x2f, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, NULL, NULL, /* VERIFY(10) */
528 	    {10,  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7,
529 	     0, 0, 0, 0, 0, 0} },
530 	{1, 0x7f, 0x9, F_SA_HIGH | F_D_IN | FF_DIRECT_IO, resp_read_dt0,
531 	    vl_iarr, {32,  0xc7, 0, 0, 0, 0, 0x1f, 0x18, 0x0, 0x9, 0xfe, 0,
532 		      0xff, 0xff, 0xff, 0xff} },/* VARIABLE LENGTH, READ(32) */
533 	{1, 0x56, 0, F_D_OUT, NULL, reserve_iarr, /* RESERVE(10) */
534 	    {10,  0xff, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0,
535 	     0} },
536 	{1, 0x57, 0, F_D_OUT, NULL, release_iarr, /* RELEASE(10) */
537 	    {10,  0x13, 0xff, 0xff, 0, 0, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0,
538 	     0} },
539 /* 20 */
540 	{0, 0x1e, 0, 0, NULL, NULL, /* ALLOW REMOVAL */
541 	    {6,  0, 0, 0, 0x3, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
542 	{0, 0x1, 0, 0, resp_start_stop, NULL, /* REWIND ?? */
543 	    {6,  0x1, 0, 0, 0, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
544 	{0, 0, 0, F_INV_OP | FF_RESPOND, NULL, NULL, /* ATA_PT */
545 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
546 	{0, 0x1d, F_D_OUT, 0, NULL, NULL,	/* SEND DIAGNOSTIC */
547 	    {6,  0xf7, 0, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
548 	{0, 0x42, 0, F_D_OUT | FF_DIRECT_IO, resp_unmap, NULL, /* UNMAP */
549 	    {10,  0x1, 0, 0, 0, 0, 0x1f, 0xff, 0xff, 0xc7, 0, 0, 0, 0, 0, 0} },
550 	{0, 0x53, 0, F_D_IN | F_D_OUT | FF_DIRECT_IO, resp_xdwriteread_10,
551 	    NULL, {10,  0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7,
552 		   0, 0, 0, 0, 0, 0} },
553 	{0, 0x3b, 0, F_D_OUT_MAYBE, resp_write_buffer, NULL,
554 	    {10,  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc7, 0, 0,
555 	     0, 0, 0, 0} },			/* WRITE_BUFFER */
556 	{1, 0x41, 0, F_D_OUT_MAYBE | FF_DIRECT_IO, resp_write_same_10,
557 	    write_same_iarr, {10,  0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff,
558 			      0xff, 0xc7, 0, 0, 0, 0, 0, 0} },
559 	{0, 0x35, 0, F_DELAY_OVERR | FF_DIRECT_IO, NULL, NULL, /* SYNC_CACHE */
560 	    {10,  0x7, 0xff, 0xff, 0xff, 0xff, 0x1f, 0xff, 0xff, 0xc7, 0, 0,
561 	     0, 0, 0, 0} },
562 	{0, 0x89, 0, F_D_OUT | FF_DIRECT_IO, resp_comp_write, NULL,
563 	    {16,  0xf8, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0, 0,
564 	     0, 0xff, 0x1f, 0xc7} },		/* COMPARE AND WRITE */
565 
566 /* 30 */
567 	{0xff, 0, 0, 0, NULL, NULL,		/* terminating element */
568 	    {0,  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0} },
569 };
570 
571 static int sdebug_add_host = DEF_NUM_HOST;
572 static int sdebug_ato = DEF_ATO;
573 static int sdebug_jdelay = DEF_JDELAY;	/* if > 0 then unit is jiffies */
574 static int sdebug_dev_size_mb = DEF_DEV_SIZE_MB;
575 static int sdebug_dif = DEF_DIF;
576 static int sdebug_dix = DEF_DIX;
577 static int sdebug_dsense = DEF_D_SENSE;
578 static int sdebug_every_nth = DEF_EVERY_NTH;
579 static int sdebug_fake_rw = DEF_FAKE_RW;
580 static unsigned int sdebug_guard = DEF_GUARD;
581 static int sdebug_lowest_aligned = DEF_LOWEST_ALIGNED;
582 static int sdebug_max_luns = DEF_MAX_LUNS;
583 static int sdebug_max_queue = SDEBUG_CANQUEUE;	/* per submit queue */
584 static atomic_t retired_max_queue;	/* if > 0 then was prior max_queue */
585 static int sdebug_ndelay = DEF_NDELAY;	/* if > 0 then unit is nanoseconds */
586 static int sdebug_no_lun_0 = DEF_NO_LUN_0;
587 static int sdebug_no_uld;
588 static int sdebug_num_parts = DEF_NUM_PARTS;
589 static int sdebug_num_tgts = DEF_NUM_TGTS; /* targets per host */
590 static int sdebug_opt_blks = DEF_OPT_BLKS;
591 static int sdebug_opts = DEF_OPTS;
592 static int sdebug_physblk_exp = DEF_PHYSBLK_EXP;
593 static int sdebug_ptype = DEF_PTYPE; /* SCSI peripheral device type */
594 static int sdebug_scsi_level = DEF_SCSI_LEVEL;
595 static int sdebug_sector_size = DEF_SECTOR_SIZE;
596 static int sdebug_virtual_gb = DEF_VIRTUAL_GB;
597 static int sdebug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
598 static unsigned int sdebug_lbpu = DEF_LBPU;
599 static unsigned int sdebug_lbpws = DEF_LBPWS;
600 static unsigned int sdebug_lbpws10 = DEF_LBPWS10;
601 static unsigned int sdebug_lbprz = DEF_LBPRZ;
602 static unsigned int sdebug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
603 static unsigned int sdebug_unmap_granularity = DEF_UNMAP_GRANULARITY;
604 static unsigned int sdebug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
605 static unsigned int sdebug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
606 static unsigned int sdebug_write_same_length = DEF_WRITESAME_LENGTH;
607 static int sdebug_uuid_ctl = DEF_UUID_CTL;
608 static bool sdebug_removable = DEF_REMOVABLE;
609 static bool sdebug_clustering;
610 static bool sdebug_host_lock = DEF_HOST_LOCK;
611 static bool sdebug_strict = DEF_STRICT;
612 static bool sdebug_any_injecting_opt;
613 static bool sdebug_verbose;
614 static bool have_dif_prot;
615 static bool sdebug_statistics = DEF_STATISTICS;
616 static bool sdebug_mq_active;
617 
618 static unsigned int sdebug_store_sectors;
619 static sector_t sdebug_capacity;	/* in sectors */
620 
621 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
622    may still need them */
623 static int sdebug_heads;		/* heads per disk */
624 static int sdebug_cylinders_per;	/* cylinders per surface */
625 static int sdebug_sectors_per;		/* sectors per cylinder */
626 
627 static LIST_HEAD(sdebug_host_list);
628 static DEFINE_SPINLOCK(sdebug_host_list_lock);
629 
630 static unsigned char *fake_storep;	/* ramdisk storage */
631 static struct t10_pi_tuple *dif_storep;	/* protection info */
632 static void *map_storep;		/* provisioning map */
633 
634 static unsigned long map_size;
635 static int num_aborts;
636 static int num_dev_resets;
637 static int num_target_resets;
638 static int num_bus_resets;
639 static int num_host_resets;
640 static int dix_writes;
641 static int dix_reads;
642 static int dif_errors;
643 
644 static int submit_queues = DEF_SUBMIT_QUEUES;  /* > 1 for multi-queue (mq) */
645 static struct sdebug_queue *sdebug_q_arr;  /* ptr to array of submit queues */
646 
647 static DEFINE_RWLOCK(atomic_rw);
648 
649 static char sdebug_proc_name[] = MY_NAME;
650 static const char *my_name = MY_NAME;
651 
652 static struct bus_type pseudo_lld_bus;
653 
654 static struct device_driver sdebug_driverfs_driver = {
655 	.name 		= sdebug_proc_name,
656 	.bus		= &pseudo_lld_bus,
657 };
658 
659 static const int check_condition_result =
660 		(DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
661 
662 static const int illegal_condition_result =
663 	(DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
664 
665 static const int device_qfull_result =
666 	(DID_OK << 16) | (COMMAND_COMPLETE << 8) | SAM_STAT_TASK_SET_FULL;
667 
668 
669 /* Only do the extra work involved in logical block provisioning if one or
670  * more of the lbpu, lbpws or lbpws10 parameters are given and we are doing
671  * real reads and writes (i.e. not skipping them for speed).
672  */
673 static inline bool scsi_debug_lbp(void)
674 {
675 	return 0 == sdebug_fake_rw &&
676 		(sdebug_lbpu || sdebug_lbpws || sdebug_lbpws10);
677 }
678 
679 static void *fake_store(unsigned long long lba)
680 {
681 	lba = do_div(lba, sdebug_store_sectors);
682 
683 	return fake_storep + lba * sdebug_sector_size;
684 }
685 
686 static struct t10_pi_tuple *dif_store(sector_t sector)
687 {
688 	sector = sector_div(sector, sdebug_store_sectors);
689 
690 	return dif_storep + sector;
691 }
692 
693 static void sdebug_max_tgts_luns(void)
694 {
695 	struct sdebug_host_info *sdbg_host;
696 	struct Scsi_Host *hpnt;
697 
698 	spin_lock(&sdebug_host_list_lock);
699 	list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
700 		hpnt = sdbg_host->shost;
701 		if ((hpnt->this_id >= 0) &&
702 		    (sdebug_num_tgts > hpnt->this_id))
703 			hpnt->max_id = sdebug_num_tgts + 1;
704 		else
705 			hpnt->max_id = sdebug_num_tgts;
706 		/* sdebug_max_luns; */
707 		hpnt->max_lun = SCSI_W_LUN_REPORT_LUNS + 1;
708 	}
709 	spin_unlock(&sdebug_host_list_lock);
710 }
711 
712 enum sdeb_cmd_data {SDEB_IN_DATA = 0, SDEB_IN_CDB = 1};
713 
714 /* Set in_bit to -1 to indicate no bit position of invalid field */
715 static void mk_sense_invalid_fld(struct scsi_cmnd *scp,
716 				 enum sdeb_cmd_data c_d,
717 				 int in_byte, int in_bit)
718 {
719 	unsigned char *sbuff;
720 	u8 sks[4];
721 	int sl, asc;
722 
723 	sbuff = scp->sense_buffer;
724 	if (!sbuff) {
725 		sdev_printk(KERN_ERR, scp->device,
726 			    "%s: sense_buffer is NULL\n", __func__);
727 		return;
728 	}
729 	asc = c_d ? INVALID_FIELD_IN_CDB : INVALID_FIELD_IN_PARAM_LIST;
730 	memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE);
731 	scsi_build_sense_buffer(sdebug_dsense, sbuff, ILLEGAL_REQUEST, asc, 0);
732 	memset(sks, 0, sizeof(sks));
733 	sks[0] = 0x80;
734 	if (c_d)
735 		sks[0] |= 0x40;
736 	if (in_bit >= 0) {
737 		sks[0] |= 0x8;
738 		sks[0] |= 0x7 & in_bit;
739 	}
740 	put_unaligned_be16(in_byte, sks + 1);
741 	if (sdebug_dsense) {
742 		sl = sbuff[7] + 8;
743 		sbuff[7] = sl;
744 		sbuff[sl] = 0x2;
745 		sbuff[sl + 1] = 0x6;
746 		memcpy(sbuff + sl + 4, sks, 3);
747 	} else
748 		memcpy(sbuff + 15, sks, 3);
749 	if (sdebug_verbose)
750 		sdev_printk(KERN_INFO, scp->device, "%s:  [sense_key,asc,ascq"
751 			    "]: [0x5,0x%x,0x0] %c byte=%d, bit=%d\n",
752 			    my_name, asc, c_d ? 'C' : 'D', in_byte, in_bit);
753 }
754 
755 static void mk_sense_buffer(struct scsi_cmnd *scp, int key, int asc, int asq)
756 {
757 	unsigned char *sbuff;
758 
759 	sbuff = scp->sense_buffer;
760 	if (!sbuff) {
761 		sdev_printk(KERN_ERR, scp->device,
762 			    "%s: sense_buffer is NULL\n", __func__);
763 		return;
764 	}
765 	memset(sbuff, 0, SCSI_SENSE_BUFFERSIZE);
766 
767 	scsi_build_sense_buffer(sdebug_dsense, sbuff, key, asc, asq);
768 
769 	if (sdebug_verbose)
770 		sdev_printk(KERN_INFO, scp->device,
771 			    "%s:  [sense_key,asc,ascq]: [0x%x,0x%x,0x%x]\n",
772 			    my_name, key, asc, asq);
773 }
774 
775 static void mk_sense_invalid_opcode(struct scsi_cmnd *scp)
776 {
777 	mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
778 }
779 
780 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
781 {
782 	if (sdebug_verbose) {
783 		if (0x1261 == cmd)
784 			sdev_printk(KERN_INFO, dev,
785 				    "%s: BLKFLSBUF [0x1261]\n", __func__);
786 		else if (0x5331 == cmd)
787 			sdev_printk(KERN_INFO, dev,
788 				    "%s: CDROM_GET_CAPABILITY [0x5331]\n",
789 				    __func__);
790 		else
791 			sdev_printk(KERN_INFO, dev, "%s: cmd=0x%x\n",
792 				    __func__, cmd);
793 	}
794 	return -EINVAL;
795 	/* return -ENOTTY; // correct return but upsets fdisk */
796 }
797 
798 static void clear_luns_changed_on_target(struct sdebug_dev_info *devip)
799 {
800 	struct sdebug_host_info *sdhp;
801 	struct sdebug_dev_info *dp;
802 
803 	spin_lock(&sdebug_host_list_lock);
804 	list_for_each_entry(sdhp, &sdebug_host_list, host_list) {
805 		list_for_each_entry(dp, &sdhp->dev_info_list, dev_list) {
806 			if ((devip->sdbg_host == dp->sdbg_host) &&
807 			    (devip->target == dp->target))
808 				clear_bit(SDEBUG_UA_LUNS_CHANGED, dp->uas_bm);
809 		}
810 	}
811 	spin_unlock(&sdebug_host_list_lock);
812 }
813 
814 static int make_ua(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
815 {
816 	int k;
817 
818 	k = find_first_bit(devip->uas_bm, SDEBUG_NUM_UAS);
819 	if (k != SDEBUG_NUM_UAS) {
820 		const char *cp = NULL;
821 
822 		switch (k) {
823 		case SDEBUG_UA_POR:
824 			mk_sense_buffer(scp, UNIT_ATTENTION, UA_RESET_ASC,
825 					POWER_ON_RESET_ASCQ);
826 			if (sdebug_verbose)
827 				cp = "power on reset";
828 			break;
829 		case SDEBUG_UA_BUS_RESET:
830 			mk_sense_buffer(scp, UNIT_ATTENTION, UA_RESET_ASC,
831 					BUS_RESET_ASCQ);
832 			if (sdebug_verbose)
833 				cp = "bus reset";
834 			break;
835 		case SDEBUG_UA_MODE_CHANGED:
836 			mk_sense_buffer(scp, UNIT_ATTENTION, UA_CHANGED_ASC,
837 					MODE_CHANGED_ASCQ);
838 			if (sdebug_verbose)
839 				cp = "mode parameters changed";
840 			break;
841 		case SDEBUG_UA_CAPACITY_CHANGED:
842 			mk_sense_buffer(scp, UNIT_ATTENTION, UA_CHANGED_ASC,
843 					CAPACITY_CHANGED_ASCQ);
844 			if (sdebug_verbose)
845 				cp = "capacity data changed";
846 			break;
847 		case SDEBUG_UA_MICROCODE_CHANGED:
848 			mk_sense_buffer(scp, UNIT_ATTENTION,
849 					TARGET_CHANGED_ASC,
850 					MICROCODE_CHANGED_ASCQ);
851 			if (sdebug_verbose)
852 				cp = "microcode has been changed";
853 			break;
854 		case SDEBUG_UA_MICROCODE_CHANGED_WO_RESET:
855 			mk_sense_buffer(scp, UNIT_ATTENTION,
856 					TARGET_CHANGED_ASC,
857 					MICROCODE_CHANGED_WO_RESET_ASCQ);
858 			if (sdebug_verbose)
859 				cp = "microcode has been changed without reset";
860 			break;
861 		case SDEBUG_UA_LUNS_CHANGED:
862 			/*
863 			 * SPC-3 behavior is to report a UNIT ATTENTION with
864 			 * ASC/ASCQ REPORTED LUNS DATA HAS CHANGED on every LUN
865 			 * on the target, until a REPORT LUNS command is
866 			 * received.  SPC-4 behavior is to report it only once.
867 			 * NOTE:  sdebug_scsi_level does not use the same
868 			 * values as struct scsi_device->scsi_level.
869 			 */
870 			if (sdebug_scsi_level >= 6)	/* SPC-4 and above */
871 				clear_luns_changed_on_target(devip);
872 			mk_sense_buffer(scp, UNIT_ATTENTION,
873 					TARGET_CHANGED_ASC,
874 					LUNS_CHANGED_ASCQ);
875 			if (sdebug_verbose)
876 				cp = "reported luns data has changed";
877 			break;
878 		default:
879 			pr_warn("unexpected unit attention code=%d\n", k);
880 			if (sdebug_verbose)
881 				cp = "unknown";
882 			break;
883 		}
884 		clear_bit(k, devip->uas_bm);
885 		if (sdebug_verbose)
886 			sdev_printk(KERN_INFO, scp->device,
887 				   "%s reports: Unit attention: %s\n",
888 				   my_name, cp);
889 		return check_condition_result;
890 	}
891 	return 0;
892 }
893 
894 /* Build SCSI "data-in" buffer. Returns 0 if ok else (DID_ERROR << 16). */
895 static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
896 				int arr_len)
897 {
898 	int act_len;
899 	struct scsi_data_buffer *sdb = scsi_in(scp);
900 
901 	if (!sdb->length)
902 		return 0;
903 	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
904 		return DID_ERROR << 16;
905 
906 	act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
907 				      arr, arr_len);
908 	sdb->resid = scsi_bufflen(scp) - act_len;
909 
910 	return 0;
911 }
912 
913 /* Partial build of SCSI "data-in" buffer. Returns 0 if ok else
914  * (DID_ERROR << 16). Can write to offset in data-in buffer. If multiple
915  * calls, not required to write in ascending offset order. Assumes resid
916  * set to scsi_bufflen() prior to any calls.
917  */
918 static int p_fill_from_dev_buffer(struct scsi_cmnd *scp, const void *arr,
919 				  int arr_len, unsigned int off_dst)
920 {
921 	int act_len, n;
922 	struct scsi_data_buffer *sdb = scsi_in(scp);
923 	off_t skip = off_dst;
924 
925 	if (sdb->length <= off_dst)
926 		return 0;
927 	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
928 		return DID_ERROR << 16;
929 
930 	act_len = sg_pcopy_from_buffer(sdb->table.sgl, sdb->table.nents,
931 				       arr, arr_len, skip);
932 	pr_debug("%s: off_dst=%u, scsi_bufflen=%u, act_len=%u, resid=%d\n",
933 		 __func__, off_dst, scsi_bufflen(scp), act_len, sdb->resid);
934 	n = (int)scsi_bufflen(scp) - ((int)off_dst + act_len);
935 	sdb->resid = min(sdb->resid, n);
936 	return 0;
937 }
938 
939 /* Fetches from SCSI "data-out" buffer. Returns number of bytes fetched into
940  * 'arr' or -1 if error.
941  */
942 static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
943 			       int arr_len)
944 {
945 	if (!scsi_bufflen(scp))
946 		return 0;
947 	if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
948 		return -1;
949 
950 	return scsi_sg_copy_to_buffer(scp, arr, arr_len);
951 }
952 
953 
954 static const char * inq_vendor_id = "Linux   ";
955 static const char * inq_product_id = "scsi_debug      ";
956 static const char *inq_product_rev = "0186";	/* version less '.' */
957 /* Use some locally assigned NAAs for SAS addresses. */
958 static const u64 naa3_comp_a = 0x3222222000000000ULL;
959 static const u64 naa3_comp_b = 0x3333333000000000ULL;
960 static const u64 naa3_comp_c = 0x3111111000000000ULL;
961 
962 /* Device identification VPD page. Returns number of bytes placed in arr */
963 static int inquiry_vpd_83(unsigned char *arr, int port_group_id,
964 			  int target_dev_id, int dev_id_num,
965 			  const char *dev_id_str, int dev_id_str_len,
966 			  const uuid_be *lu_name)
967 {
968 	int num, port_a;
969 	char b[32];
970 
971 	port_a = target_dev_id + 1;
972 	/* T10 vendor identifier field format (faked) */
973 	arr[0] = 0x2;	/* ASCII */
974 	arr[1] = 0x1;
975 	arr[2] = 0x0;
976 	memcpy(&arr[4], inq_vendor_id, 8);
977 	memcpy(&arr[12], inq_product_id, 16);
978 	memcpy(&arr[28], dev_id_str, dev_id_str_len);
979 	num = 8 + 16 + dev_id_str_len;
980 	arr[3] = num;
981 	num += 4;
982 	if (dev_id_num >= 0) {
983 		if (sdebug_uuid_ctl) {
984 			/* Locally assigned UUID */
985 			arr[num++] = 0x1;  /* binary (not necessarily sas) */
986 			arr[num++] = 0xa;  /* PIV=0, lu, naa */
987 			arr[num++] = 0x0;
988 			arr[num++] = 0x12;
989 			arr[num++] = 0x10; /* uuid type=1, locally assigned */
990 			arr[num++] = 0x0;
991 			memcpy(arr + num, lu_name, 16);
992 			num += 16;
993 		} else {
994 			/* NAA-3, Logical unit identifier (binary) */
995 			arr[num++] = 0x1;  /* binary (not necessarily sas) */
996 			arr[num++] = 0x3;  /* PIV=0, lu, naa */
997 			arr[num++] = 0x0;
998 			arr[num++] = 0x8;
999 			put_unaligned_be64(naa3_comp_b + dev_id_num, arr + num);
1000 			num += 8;
1001 		}
1002 		/* Target relative port number */
1003 		arr[num++] = 0x61;	/* proto=sas, binary */
1004 		arr[num++] = 0x94;	/* PIV=1, target port, rel port */
1005 		arr[num++] = 0x0;	/* reserved */
1006 		arr[num++] = 0x4;	/* length */
1007 		arr[num++] = 0x0;	/* reserved */
1008 		arr[num++] = 0x0;	/* reserved */
1009 		arr[num++] = 0x0;
1010 		arr[num++] = 0x1;	/* relative port A */
1011 	}
1012 	/* NAA-3, Target port identifier */
1013 	arr[num++] = 0x61;	/* proto=sas, binary */
1014 	arr[num++] = 0x93;	/* piv=1, target port, naa */
1015 	arr[num++] = 0x0;
1016 	arr[num++] = 0x8;
1017 	put_unaligned_be64(naa3_comp_a + port_a, arr + num);
1018 	num += 8;
1019 	/* NAA-3, Target port group identifier */
1020 	arr[num++] = 0x61;	/* proto=sas, binary */
1021 	arr[num++] = 0x95;	/* piv=1, target port group id */
1022 	arr[num++] = 0x0;
1023 	arr[num++] = 0x4;
1024 	arr[num++] = 0;
1025 	arr[num++] = 0;
1026 	put_unaligned_be16(port_group_id, arr + num);
1027 	num += 2;
1028 	/* NAA-3, Target device identifier */
1029 	arr[num++] = 0x61;	/* proto=sas, binary */
1030 	arr[num++] = 0xa3;	/* piv=1, target device, naa */
1031 	arr[num++] = 0x0;
1032 	arr[num++] = 0x8;
1033 	put_unaligned_be64(naa3_comp_a + target_dev_id, arr + num);
1034 	num += 8;
1035 	/* SCSI name string: Target device identifier */
1036 	arr[num++] = 0x63;	/* proto=sas, UTF-8 */
1037 	arr[num++] = 0xa8;	/* piv=1, target device, SCSI name string */
1038 	arr[num++] = 0x0;
1039 	arr[num++] = 24;
1040 	memcpy(arr + num, "naa.32222220", 12);
1041 	num += 12;
1042 	snprintf(b, sizeof(b), "%08X", target_dev_id);
1043 	memcpy(arr + num, b, 8);
1044 	num += 8;
1045 	memset(arr + num, 0, 4);
1046 	num += 4;
1047 	return num;
1048 }
1049 
1050 static unsigned char vpd84_data[] = {
1051 /* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
1052     0x22,0x22,0x22,0x0,0xbb,0x1,
1053     0x22,0x22,0x22,0x0,0xbb,0x2,
1054 };
1055 
1056 /*  Software interface identification VPD page */
1057 static int inquiry_vpd_84(unsigned char *arr)
1058 {
1059 	memcpy(arr, vpd84_data, sizeof(vpd84_data));
1060 	return sizeof(vpd84_data);
1061 }
1062 
1063 /* Management network addresses VPD page */
1064 static int inquiry_vpd_85(unsigned char *arr)
1065 {
1066 	int num = 0;
1067 	const char * na1 = "https://www.kernel.org/config";
1068 	const char * na2 = "http://www.kernel.org/log";
1069 	int plen, olen;
1070 
1071 	arr[num++] = 0x1;	/* lu, storage config */
1072 	arr[num++] = 0x0;	/* reserved */
1073 	arr[num++] = 0x0;
1074 	olen = strlen(na1);
1075 	plen = olen + 1;
1076 	if (plen % 4)
1077 		plen = ((plen / 4) + 1) * 4;
1078 	arr[num++] = plen;	/* length, null termianted, padded */
1079 	memcpy(arr + num, na1, olen);
1080 	memset(arr + num + olen, 0, plen - olen);
1081 	num += plen;
1082 
1083 	arr[num++] = 0x4;	/* lu, logging */
1084 	arr[num++] = 0x0;	/* reserved */
1085 	arr[num++] = 0x0;
1086 	olen = strlen(na2);
1087 	plen = olen + 1;
1088 	if (plen % 4)
1089 		plen = ((plen / 4) + 1) * 4;
1090 	arr[num++] = plen;	/* length, null terminated, padded */
1091 	memcpy(arr + num, na2, olen);
1092 	memset(arr + num + olen, 0, plen - olen);
1093 	num += plen;
1094 
1095 	return num;
1096 }
1097 
1098 /* SCSI ports VPD page */
1099 static int inquiry_vpd_88(unsigned char *arr, int target_dev_id)
1100 {
1101 	int num = 0;
1102 	int port_a, port_b;
1103 
1104 	port_a = target_dev_id + 1;
1105 	port_b = port_a + 1;
1106 	arr[num++] = 0x0;	/* reserved */
1107 	arr[num++] = 0x0;	/* reserved */
1108 	arr[num++] = 0x0;
1109 	arr[num++] = 0x1;	/* relative port 1 (primary) */
1110 	memset(arr + num, 0, 6);
1111 	num += 6;
1112 	arr[num++] = 0x0;
1113 	arr[num++] = 12;	/* length tp descriptor */
1114 	/* naa-5 target port identifier (A) */
1115 	arr[num++] = 0x61;	/* proto=sas, binary */
1116 	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
1117 	arr[num++] = 0x0;	/* reserved */
1118 	arr[num++] = 0x8;	/* length */
1119 	put_unaligned_be64(naa3_comp_a + port_a, arr + num);
1120 	num += 8;
1121 	arr[num++] = 0x0;	/* reserved */
1122 	arr[num++] = 0x0;	/* reserved */
1123 	arr[num++] = 0x0;
1124 	arr[num++] = 0x2;	/* relative port 2 (secondary) */
1125 	memset(arr + num, 0, 6);
1126 	num += 6;
1127 	arr[num++] = 0x0;
1128 	arr[num++] = 12;	/* length tp descriptor */
1129 	/* naa-5 target port identifier (B) */
1130 	arr[num++] = 0x61;	/* proto=sas, binary */
1131 	arr[num++] = 0x93;	/* PIV=1, target port, NAA */
1132 	arr[num++] = 0x0;	/* reserved */
1133 	arr[num++] = 0x8;	/* length */
1134 	put_unaligned_be64(naa3_comp_a + port_b, arr + num);
1135 	num += 8;
1136 
1137 	return num;
1138 }
1139 
1140 
1141 static unsigned char vpd89_data[] = {
1142 /* from 4th byte */ 0,0,0,0,
1143 'l','i','n','u','x',' ',' ',' ',
1144 'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
1145 '1','2','3','4',
1146 0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
1147 0xec,0,0,0,
1148 0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
1149 0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
1150 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
1151 0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
1152 0x53,0x41,
1153 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
1154 0x20,0x20,
1155 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
1156 0x10,0x80,
1157 0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
1158 0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
1159 0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
1160 0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
1161 0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
1162 0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
1163 0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
1164 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1165 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1166 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1167 0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
1168 0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
1169 0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
1170 0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
1171 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1172 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1173 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1174 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1175 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1176 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1177 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1178 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1179 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1180 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1181 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1182 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
1183 };
1184 
1185 /* ATA Information VPD page */
1186 static int inquiry_vpd_89(unsigned char *arr)
1187 {
1188 	memcpy(arr, vpd89_data, sizeof(vpd89_data));
1189 	return sizeof(vpd89_data);
1190 }
1191 
1192 
1193 static unsigned char vpdb0_data[] = {
1194 	/* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
1195 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1196 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1197 	0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
1198 };
1199 
1200 /* Block limits VPD page (SBC-3) */
1201 static int inquiry_vpd_b0(unsigned char *arr)
1202 {
1203 	unsigned int gran;
1204 
1205 	memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
1206 
1207 	/* Optimal transfer length granularity */
1208 	gran = 1 << sdebug_physblk_exp;
1209 	put_unaligned_be16(gran, arr + 2);
1210 
1211 	/* Maximum Transfer Length */
1212 	if (sdebug_store_sectors > 0x400)
1213 		put_unaligned_be32(sdebug_store_sectors, arr + 4);
1214 
1215 	/* Optimal Transfer Length */
1216 	put_unaligned_be32(sdebug_opt_blks, &arr[8]);
1217 
1218 	if (sdebug_lbpu) {
1219 		/* Maximum Unmap LBA Count */
1220 		put_unaligned_be32(sdebug_unmap_max_blocks, &arr[16]);
1221 
1222 		/* Maximum Unmap Block Descriptor Count */
1223 		put_unaligned_be32(sdebug_unmap_max_desc, &arr[20]);
1224 	}
1225 
1226 	/* Unmap Granularity Alignment */
1227 	if (sdebug_unmap_alignment) {
1228 		put_unaligned_be32(sdebug_unmap_alignment, &arr[28]);
1229 		arr[28] |= 0x80; /* UGAVALID */
1230 	}
1231 
1232 	/* Optimal Unmap Granularity */
1233 	put_unaligned_be32(sdebug_unmap_granularity, &arr[24]);
1234 
1235 	/* Maximum WRITE SAME Length */
1236 	put_unaligned_be64(sdebug_write_same_length, &arr[32]);
1237 
1238 	return 0x3c; /* Mandatory page length for Logical Block Provisioning */
1239 
1240 	return sizeof(vpdb0_data);
1241 }
1242 
1243 /* Block device characteristics VPD page (SBC-3) */
1244 static int inquiry_vpd_b1(unsigned char *arr)
1245 {
1246 	memset(arr, 0, 0x3c);
1247 	arr[0] = 0;
1248 	arr[1] = 1;	/* non rotating medium (e.g. solid state) */
1249 	arr[2] = 0;
1250 	arr[3] = 5;	/* less than 1.8" */
1251 
1252 	return 0x3c;
1253 }
1254 
1255 /* Logical block provisioning VPD page (SBC-4) */
1256 static int inquiry_vpd_b2(unsigned char *arr)
1257 {
1258 	memset(arr, 0, 0x4);
1259 	arr[0] = 0;			/* threshold exponent */
1260 	if (sdebug_lbpu)
1261 		arr[1] = 1 << 7;
1262 	if (sdebug_lbpws)
1263 		arr[1] |= 1 << 6;
1264 	if (sdebug_lbpws10)
1265 		arr[1] |= 1 << 5;
1266 	if (sdebug_lbprz && scsi_debug_lbp())
1267 		arr[1] |= (sdebug_lbprz & 0x7) << 2;  /* sbc4r07 and later */
1268 	/* anc_sup=0; dp=0 (no provisioning group descriptor) */
1269 	/* minimum_percentage=0; provisioning_type=0 (unknown) */
1270 	/* threshold_percentage=0 */
1271 	return 0x4;
1272 }
1273 
1274 #define SDEBUG_LONG_INQ_SZ 96
1275 #define SDEBUG_MAX_INQ_ARR_SZ 584
1276 
1277 static int resp_inquiry(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
1278 {
1279 	unsigned char pq_pdt;
1280 	unsigned char * arr;
1281 	unsigned char *cmd = scp->cmnd;
1282 	int alloc_len, n, ret;
1283 	bool have_wlun, is_disk;
1284 
1285 	alloc_len = get_unaligned_be16(cmd + 3);
1286 	arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
1287 	if (! arr)
1288 		return DID_REQUEUE << 16;
1289 	is_disk = (sdebug_ptype == TYPE_DISK);
1290 	have_wlun = scsi_is_wlun(scp->device->lun);
1291 	if (have_wlun)
1292 		pq_pdt = TYPE_WLUN;	/* present, wlun */
1293 	else if (sdebug_no_lun_0 && (devip->lun == SDEBUG_LUN_0_VAL))
1294 		pq_pdt = 0x7f;	/* not present, PQ=3, PDT=0x1f */
1295 	else
1296 		pq_pdt = (sdebug_ptype & 0x1f);
1297 	arr[0] = pq_pdt;
1298 	if (0x2 & cmd[1]) {  /* CMDDT bit set */
1299 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 1);
1300 		kfree(arr);
1301 		return check_condition_result;
1302 	} else if (0x1 & cmd[1]) {  /* EVPD bit set */
1303 		int lu_id_num, port_group_id, target_dev_id, len;
1304 		char lu_id_str[6];
1305 		int host_no = devip->sdbg_host->shost->host_no;
1306 
1307 		port_group_id = (((host_no + 1) & 0x7f) << 8) +
1308 		    (devip->channel & 0x7f);
1309 		if (sdebug_vpd_use_hostno == 0)
1310 			host_no = 0;
1311 		lu_id_num = have_wlun ? -1 : (((host_no + 1) * 2000) +
1312 			    (devip->target * 1000) + devip->lun);
1313 		target_dev_id = ((host_no + 1) * 2000) +
1314 				 (devip->target * 1000) - 3;
1315 		len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
1316 		if (0 == cmd[2]) { /* supported vital product data pages */
1317 			arr[1] = cmd[2];	/*sanity */
1318 			n = 4;
1319 			arr[n++] = 0x0;   /* this page */
1320 			arr[n++] = 0x80;  /* unit serial number */
1321 			arr[n++] = 0x83;  /* device identification */
1322 			arr[n++] = 0x84;  /* software interface ident. */
1323 			arr[n++] = 0x85;  /* management network addresses */
1324 			arr[n++] = 0x86;  /* extended inquiry */
1325 			arr[n++] = 0x87;  /* mode page policy */
1326 			arr[n++] = 0x88;  /* SCSI ports */
1327 			if (is_disk) {	  /* SBC only */
1328 				arr[n++] = 0x89;  /* ATA information */
1329 				arr[n++] = 0xb0;  /* Block limits */
1330 				arr[n++] = 0xb1;  /* Block characteristics */
1331 				arr[n++] = 0xb2;  /* Logical Block Prov */
1332 			}
1333 			arr[3] = n - 4;	  /* number of supported VPD pages */
1334 		} else if (0x80 == cmd[2]) { /* unit serial number */
1335 			arr[1] = cmd[2];	/*sanity */
1336 			arr[3] = len;
1337 			memcpy(&arr[4], lu_id_str, len);
1338 		} else if (0x83 == cmd[2]) { /* device identification */
1339 			arr[1] = cmd[2];	/*sanity */
1340 			arr[3] = inquiry_vpd_83(&arr[4], port_group_id,
1341 						target_dev_id, lu_id_num,
1342 						lu_id_str, len,
1343 						&devip->lu_name);
1344 		} else if (0x84 == cmd[2]) { /* Software interface ident. */
1345 			arr[1] = cmd[2];	/*sanity */
1346 			arr[3] = inquiry_vpd_84(&arr[4]);
1347 		} else if (0x85 == cmd[2]) { /* Management network addresses */
1348 			arr[1] = cmd[2];	/*sanity */
1349 			arr[3] = inquiry_vpd_85(&arr[4]);
1350 		} else if (0x86 == cmd[2]) { /* extended inquiry */
1351 			arr[1] = cmd[2];	/*sanity */
1352 			arr[3] = 0x3c;	/* number of following entries */
1353 			if (sdebug_dif == T10_PI_TYPE3_PROTECTION)
1354 				arr[4] = 0x4;	/* SPT: GRD_CHK:1 */
1355 			else if (have_dif_prot)
1356 				arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
1357 			else
1358 				arr[4] = 0x0;   /* no protection stuff */
1359 			arr[5] = 0x7;   /* head of q, ordered + simple q's */
1360 		} else if (0x87 == cmd[2]) { /* mode page policy */
1361 			arr[1] = cmd[2];	/*sanity */
1362 			arr[3] = 0x8;	/* number of following entries */
1363 			arr[4] = 0x2;	/* disconnect-reconnect mp */
1364 			arr[6] = 0x80;	/* mlus, shared */
1365 			arr[8] = 0x18;	 /* protocol specific lu */
1366 			arr[10] = 0x82;	 /* mlus, per initiator port */
1367 		} else if (0x88 == cmd[2]) { /* SCSI Ports */
1368 			arr[1] = cmd[2];	/*sanity */
1369 			arr[3] = inquiry_vpd_88(&arr[4], target_dev_id);
1370 		} else if (is_disk && 0x89 == cmd[2]) { /* ATA information */
1371 			arr[1] = cmd[2];        /*sanity */
1372 			n = inquiry_vpd_89(&arr[4]);
1373 			put_unaligned_be16(n, arr + 2);
1374 		} else if (is_disk && 0xb0 == cmd[2]) { /* Block limits */
1375 			arr[1] = cmd[2];        /*sanity */
1376 			arr[3] = inquiry_vpd_b0(&arr[4]);
1377 		} else if (is_disk && 0xb1 == cmd[2]) { /* Block char. */
1378 			arr[1] = cmd[2];        /*sanity */
1379 			arr[3] = inquiry_vpd_b1(&arr[4]);
1380 		} else if (is_disk && 0xb2 == cmd[2]) { /* LB Prov. */
1381 			arr[1] = cmd[2];        /*sanity */
1382 			arr[3] = inquiry_vpd_b2(&arr[4]);
1383 		} else {
1384 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1);
1385 			kfree(arr);
1386 			return check_condition_result;
1387 		}
1388 		len = min(get_unaligned_be16(arr + 2) + 4, alloc_len);
1389 		ret = fill_from_dev_buffer(scp, arr,
1390 			    min(len, SDEBUG_MAX_INQ_ARR_SZ));
1391 		kfree(arr);
1392 		return ret;
1393 	}
1394 	/* drops through here for a standard inquiry */
1395 	arr[1] = sdebug_removable ? 0x80 : 0;	/* Removable disk */
1396 	arr[2] = sdebug_scsi_level;
1397 	arr[3] = 2;    /* response_data_format==2 */
1398 	arr[4] = SDEBUG_LONG_INQ_SZ - 5;
1399 	arr[5] = (int)have_dif_prot;	/* PROTECT bit */
1400 	if (sdebug_vpd_use_hostno == 0)
1401 		arr[5] = 0x10; /* claim: implicit TGPS */
1402 	arr[6] = 0x10; /* claim: MultiP */
1403 	/* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
1404 	arr[7] = 0xa; /* claim: LINKED + CMDQUE */
1405 	memcpy(&arr[8], inq_vendor_id, 8);
1406 	memcpy(&arr[16], inq_product_id, 16);
1407 	memcpy(&arr[32], inq_product_rev, 4);
1408 	/* version descriptors (2 bytes each) follow */
1409 	put_unaligned_be16(0xc0, arr + 58);   /* SAM-6 no version claimed */
1410 	put_unaligned_be16(0x5c0, arr + 60);  /* SPC-5 no version claimed */
1411 	n = 62;
1412 	if (is_disk) {		/* SBC-4 no version claimed */
1413 		put_unaligned_be16(0x600, arr + n);
1414 		n += 2;
1415 	} else if (sdebug_ptype == TYPE_TAPE) {	/* SSC-4 rev 3 */
1416 		put_unaligned_be16(0x525, arr + n);
1417 		n += 2;
1418 	}
1419 	put_unaligned_be16(0x2100, arr + n);	/* SPL-4 no version claimed */
1420 	ret = fill_from_dev_buffer(scp, arr,
1421 			    min(alloc_len, SDEBUG_LONG_INQ_SZ));
1422 	kfree(arr);
1423 	return ret;
1424 }
1425 
1426 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1427 				   0, 0, 0x0, 0x0};
1428 
1429 static int resp_requests(struct scsi_cmnd * scp,
1430 			 struct sdebug_dev_info * devip)
1431 {
1432 	unsigned char * sbuff;
1433 	unsigned char *cmd = scp->cmnd;
1434 	unsigned char arr[SCSI_SENSE_BUFFERSIZE];
1435 	bool dsense;
1436 	int len = 18;
1437 
1438 	memset(arr, 0, sizeof(arr));
1439 	dsense = !!(cmd[1] & 1);
1440 	sbuff = scp->sense_buffer;
1441 	if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
1442 		if (dsense) {
1443 			arr[0] = 0x72;
1444 			arr[1] = 0x0;		/* NO_SENSE in sense_key */
1445 			arr[2] = THRESHOLD_EXCEEDED;
1446 			arr[3] = 0xff;		/* TEST set and MRIE==6 */
1447 			len = 8;
1448 		} else {
1449 			arr[0] = 0x70;
1450 			arr[2] = 0x0;		/* NO_SENSE in sense_key */
1451 			arr[7] = 0xa;   	/* 18 byte sense buffer */
1452 			arr[12] = THRESHOLD_EXCEEDED;
1453 			arr[13] = 0xff;		/* TEST set and MRIE==6 */
1454 		}
1455 	} else {
1456 		memcpy(arr, sbuff, SCSI_SENSE_BUFFERSIZE);
1457 		if (arr[0] >= 0x70 && dsense == sdebug_dsense)
1458 			;	/* have sense and formats match */
1459 		else if (arr[0] <= 0x70) {
1460 			if (dsense) {
1461 				memset(arr, 0, 8);
1462 				arr[0] = 0x72;
1463 				len = 8;
1464 			} else {
1465 				memset(arr, 0, 18);
1466 				arr[0] = 0x70;
1467 				arr[7] = 0xa;
1468 			}
1469 		} else if (dsense) {
1470 			memset(arr, 0, 8);
1471 			arr[0] = 0x72;
1472 			arr[1] = sbuff[2];     /* sense key */
1473 			arr[2] = sbuff[12];    /* asc */
1474 			arr[3] = sbuff[13];    /* ascq */
1475 			len = 8;
1476 		} else {
1477 			memset(arr, 0, 18);
1478 			arr[0] = 0x70;
1479 			arr[2] = sbuff[1];
1480 			arr[7] = 0xa;
1481 			arr[12] = sbuff[1];
1482 			arr[13] = sbuff[3];
1483 		}
1484 
1485 	}
1486 	mk_sense_buffer(scp, 0, NO_ADDITIONAL_SENSE, 0);
1487 	return fill_from_dev_buffer(scp, arr, len);
1488 }
1489 
1490 static int resp_start_stop(struct scsi_cmnd * scp,
1491 			   struct sdebug_dev_info * devip)
1492 {
1493 	unsigned char *cmd = scp->cmnd;
1494 	int power_cond, stop;
1495 
1496 	power_cond = (cmd[4] & 0xf0) >> 4;
1497 	if (power_cond) {
1498 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, 7);
1499 		return check_condition_result;
1500 	}
1501 	stop = !(cmd[4] & 1);
1502 	atomic_xchg(&devip->stopped, stop);
1503 	return 0;
1504 }
1505 
1506 static sector_t get_sdebug_capacity(void)
1507 {
1508 	static const unsigned int gibibyte = 1073741824;
1509 
1510 	if (sdebug_virtual_gb > 0)
1511 		return (sector_t)sdebug_virtual_gb *
1512 			(gibibyte / sdebug_sector_size);
1513 	else
1514 		return sdebug_store_sectors;
1515 }
1516 
1517 #define SDEBUG_READCAP_ARR_SZ 8
1518 static int resp_readcap(struct scsi_cmnd * scp,
1519 			struct sdebug_dev_info * devip)
1520 {
1521 	unsigned char arr[SDEBUG_READCAP_ARR_SZ];
1522 	unsigned int capac;
1523 
1524 	/* following just in case virtual_gb changed */
1525 	sdebug_capacity = get_sdebug_capacity();
1526 	memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
1527 	if (sdebug_capacity < 0xffffffff) {
1528 		capac = (unsigned int)sdebug_capacity - 1;
1529 		put_unaligned_be32(capac, arr + 0);
1530 	} else
1531 		put_unaligned_be32(0xffffffff, arr + 0);
1532 	put_unaligned_be16(sdebug_sector_size, arr + 6);
1533 	return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
1534 }
1535 
1536 #define SDEBUG_READCAP16_ARR_SZ 32
1537 static int resp_readcap16(struct scsi_cmnd * scp,
1538 			  struct sdebug_dev_info * devip)
1539 {
1540 	unsigned char *cmd = scp->cmnd;
1541 	unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
1542 	int alloc_len;
1543 
1544 	alloc_len = get_unaligned_be32(cmd + 10);
1545 	/* following just in case virtual_gb changed */
1546 	sdebug_capacity = get_sdebug_capacity();
1547 	memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
1548 	put_unaligned_be64((u64)(sdebug_capacity - 1), arr + 0);
1549 	put_unaligned_be32(sdebug_sector_size, arr + 8);
1550 	arr[13] = sdebug_physblk_exp & 0xf;
1551 	arr[14] = (sdebug_lowest_aligned >> 8) & 0x3f;
1552 
1553 	if (scsi_debug_lbp()) {
1554 		arr[14] |= 0x80; /* LBPME */
1555 		/* from sbc4r07, this LBPRZ field is 1 bit, but the LBPRZ in
1556 		 * the LB Provisioning VPD page is 3 bits. Note that lbprz=2
1557 		 * in the wider field maps to 0 in this field.
1558 		 */
1559 		if (sdebug_lbprz & 1)	/* precisely what the draft requires */
1560 			arr[14] |= 0x40;
1561 	}
1562 
1563 	arr[15] = sdebug_lowest_aligned & 0xff;
1564 
1565 	if (have_dif_prot) {
1566 		arr[12] = (sdebug_dif - 1) << 1; /* P_TYPE */
1567 		arr[12] |= 1; /* PROT_EN */
1568 	}
1569 
1570 	return fill_from_dev_buffer(scp, arr,
1571 				    min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
1572 }
1573 
1574 #define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
1575 
1576 static int resp_report_tgtpgs(struct scsi_cmnd * scp,
1577 			      struct sdebug_dev_info * devip)
1578 {
1579 	unsigned char *cmd = scp->cmnd;
1580 	unsigned char * arr;
1581 	int host_no = devip->sdbg_host->shost->host_no;
1582 	int n, ret, alen, rlen;
1583 	int port_group_a, port_group_b, port_a, port_b;
1584 
1585 	alen = get_unaligned_be32(cmd + 6);
1586 	arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
1587 	if (! arr)
1588 		return DID_REQUEUE << 16;
1589 	/*
1590 	 * EVPD page 0x88 states we have two ports, one
1591 	 * real and a fake port with no device connected.
1592 	 * So we create two port groups with one port each
1593 	 * and set the group with port B to unavailable.
1594 	 */
1595 	port_a = 0x1; /* relative port A */
1596 	port_b = 0x2; /* relative port B */
1597 	port_group_a = (((host_no + 1) & 0x7f) << 8) +
1598 			(devip->channel & 0x7f);
1599 	port_group_b = (((host_no + 1) & 0x7f) << 8) +
1600 			(devip->channel & 0x7f) + 0x80;
1601 
1602 	/*
1603 	 * The asymmetric access state is cycled according to the host_id.
1604 	 */
1605 	n = 4;
1606 	if (sdebug_vpd_use_hostno == 0) {
1607 		arr[n++] = host_no % 3; /* Asymm access state */
1608 		arr[n++] = 0x0F; /* claim: all states are supported */
1609 	} else {
1610 		arr[n++] = 0x0; /* Active/Optimized path */
1611 		arr[n++] = 0x01; /* only support active/optimized paths */
1612 	}
1613 	put_unaligned_be16(port_group_a, arr + n);
1614 	n += 2;
1615 	arr[n++] = 0;    /* Reserved */
1616 	arr[n++] = 0;    /* Status code */
1617 	arr[n++] = 0;    /* Vendor unique */
1618 	arr[n++] = 0x1;  /* One port per group */
1619 	arr[n++] = 0;    /* Reserved */
1620 	arr[n++] = 0;    /* Reserved */
1621 	put_unaligned_be16(port_a, arr + n);
1622 	n += 2;
1623 	arr[n++] = 3;    /* Port unavailable */
1624 	arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
1625 	put_unaligned_be16(port_group_b, arr + n);
1626 	n += 2;
1627 	arr[n++] = 0;    /* Reserved */
1628 	arr[n++] = 0;    /* Status code */
1629 	arr[n++] = 0;    /* Vendor unique */
1630 	arr[n++] = 0x1;  /* One port per group */
1631 	arr[n++] = 0;    /* Reserved */
1632 	arr[n++] = 0;    /* Reserved */
1633 	put_unaligned_be16(port_b, arr + n);
1634 	n += 2;
1635 
1636 	rlen = n - 4;
1637 	put_unaligned_be32(rlen, arr + 0);
1638 
1639 	/*
1640 	 * Return the smallest value of either
1641 	 * - The allocated length
1642 	 * - The constructed command length
1643 	 * - The maximum array size
1644 	 */
1645 	rlen = min(alen,n);
1646 	ret = fill_from_dev_buffer(scp, arr,
1647 				   min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
1648 	kfree(arr);
1649 	return ret;
1650 }
1651 
1652 static int resp_rsup_opcodes(struct scsi_cmnd *scp,
1653 			     struct sdebug_dev_info *devip)
1654 {
1655 	bool rctd;
1656 	u8 reporting_opts, req_opcode, sdeb_i, supp;
1657 	u16 req_sa, u;
1658 	u32 alloc_len, a_len;
1659 	int k, offset, len, errsts, count, bump, na;
1660 	const struct opcode_info_t *oip;
1661 	const struct opcode_info_t *r_oip;
1662 	u8 *arr;
1663 	u8 *cmd = scp->cmnd;
1664 
1665 	rctd = !!(cmd[2] & 0x80);
1666 	reporting_opts = cmd[2] & 0x7;
1667 	req_opcode = cmd[3];
1668 	req_sa = get_unaligned_be16(cmd + 4);
1669 	alloc_len = get_unaligned_be32(cmd + 6);
1670 	if (alloc_len < 4 || alloc_len > 0xffff) {
1671 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1);
1672 		return check_condition_result;
1673 	}
1674 	if (alloc_len > 8192)
1675 		a_len = 8192;
1676 	else
1677 		a_len = alloc_len;
1678 	arr = kzalloc((a_len < 256) ? 320 : a_len + 64, GFP_ATOMIC);
1679 	if (NULL == arr) {
1680 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
1681 				INSUFF_RES_ASCQ);
1682 		return check_condition_result;
1683 	}
1684 	switch (reporting_opts) {
1685 	case 0:	/* all commands */
1686 		/* count number of commands */
1687 		for (count = 0, oip = opcode_info_arr;
1688 		     oip->num_attached != 0xff; ++oip) {
1689 			if (F_INV_OP & oip->flags)
1690 				continue;
1691 			count += (oip->num_attached + 1);
1692 		}
1693 		bump = rctd ? 20 : 8;
1694 		put_unaligned_be32(count * bump, arr);
1695 		for (offset = 4, oip = opcode_info_arr;
1696 		     oip->num_attached != 0xff && offset < a_len; ++oip) {
1697 			if (F_INV_OP & oip->flags)
1698 				continue;
1699 			na = oip->num_attached;
1700 			arr[offset] = oip->opcode;
1701 			put_unaligned_be16(oip->sa, arr + offset + 2);
1702 			if (rctd)
1703 				arr[offset + 5] |= 0x2;
1704 			if (FF_SA & oip->flags)
1705 				arr[offset + 5] |= 0x1;
1706 			put_unaligned_be16(oip->len_mask[0], arr + offset + 6);
1707 			if (rctd)
1708 				put_unaligned_be16(0xa, arr + offset + 8);
1709 			r_oip = oip;
1710 			for (k = 0, oip = oip->arrp; k < na; ++k, ++oip) {
1711 				if (F_INV_OP & oip->flags)
1712 					continue;
1713 				offset += bump;
1714 				arr[offset] = oip->opcode;
1715 				put_unaligned_be16(oip->sa, arr + offset + 2);
1716 				if (rctd)
1717 					arr[offset + 5] |= 0x2;
1718 				if (FF_SA & oip->flags)
1719 					arr[offset + 5] |= 0x1;
1720 				put_unaligned_be16(oip->len_mask[0],
1721 						   arr + offset + 6);
1722 				if (rctd)
1723 					put_unaligned_be16(0xa,
1724 							   arr + offset + 8);
1725 			}
1726 			oip = r_oip;
1727 			offset += bump;
1728 		}
1729 		break;
1730 	case 1:	/* one command: opcode only */
1731 	case 2:	/* one command: opcode plus service action */
1732 	case 3:	/* one command: if sa==0 then opcode only else opcode+sa */
1733 		sdeb_i = opcode_ind_arr[req_opcode];
1734 		oip = &opcode_info_arr[sdeb_i];
1735 		if (F_INV_OP & oip->flags) {
1736 			supp = 1;
1737 			offset = 4;
1738 		} else {
1739 			if (1 == reporting_opts) {
1740 				if (FF_SA & oip->flags) {
1741 					mk_sense_invalid_fld(scp, SDEB_IN_CDB,
1742 							     2, 2);
1743 					kfree(arr);
1744 					return check_condition_result;
1745 				}
1746 				req_sa = 0;
1747 			} else if (2 == reporting_opts &&
1748 				   0 == (FF_SA & oip->flags)) {
1749 				mk_sense_invalid_fld(scp, SDEB_IN_CDB, 4, -1);
1750 				kfree(arr);	/* point at requested sa */
1751 				return check_condition_result;
1752 			}
1753 			if (0 == (FF_SA & oip->flags) &&
1754 			    req_opcode == oip->opcode)
1755 				supp = 3;
1756 			else if (0 == (FF_SA & oip->flags)) {
1757 				na = oip->num_attached;
1758 				for (k = 0, oip = oip->arrp; k < na;
1759 				     ++k, ++oip) {
1760 					if (req_opcode == oip->opcode)
1761 						break;
1762 				}
1763 				supp = (k >= na) ? 1 : 3;
1764 			} else if (req_sa != oip->sa) {
1765 				na = oip->num_attached;
1766 				for (k = 0, oip = oip->arrp; k < na;
1767 				     ++k, ++oip) {
1768 					if (req_sa == oip->sa)
1769 						break;
1770 				}
1771 				supp = (k >= na) ? 1 : 3;
1772 			} else
1773 				supp = 3;
1774 			if (3 == supp) {
1775 				u = oip->len_mask[0];
1776 				put_unaligned_be16(u, arr + 2);
1777 				arr[4] = oip->opcode;
1778 				for (k = 1; k < u; ++k)
1779 					arr[4 + k] = (k < 16) ?
1780 						 oip->len_mask[k] : 0xff;
1781 				offset = 4 + u;
1782 			} else
1783 				offset = 4;
1784 		}
1785 		arr[1] = (rctd ? 0x80 : 0) | supp;
1786 		if (rctd) {
1787 			put_unaligned_be16(0xa, arr + offset);
1788 			offset += 12;
1789 		}
1790 		break;
1791 	default:
1792 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 2);
1793 		kfree(arr);
1794 		return check_condition_result;
1795 	}
1796 	offset = (offset < a_len) ? offset : a_len;
1797 	len = (offset < alloc_len) ? offset : alloc_len;
1798 	errsts = fill_from_dev_buffer(scp, arr, len);
1799 	kfree(arr);
1800 	return errsts;
1801 }
1802 
1803 static int resp_rsup_tmfs(struct scsi_cmnd *scp,
1804 			  struct sdebug_dev_info *devip)
1805 {
1806 	bool repd;
1807 	u32 alloc_len, len;
1808 	u8 arr[16];
1809 	u8 *cmd = scp->cmnd;
1810 
1811 	memset(arr, 0, sizeof(arr));
1812 	repd = !!(cmd[2] & 0x80);
1813 	alloc_len = get_unaligned_be32(cmd + 6);
1814 	if (alloc_len < 4) {
1815 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1);
1816 		return check_condition_result;
1817 	}
1818 	arr[0] = 0xc8;		/* ATS | ATSS | LURS */
1819 	arr[1] = 0x1;		/* ITNRS */
1820 	if (repd) {
1821 		arr[3] = 0xc;
1822 		len = 16;
1823 	} else
1824 		len = 4;
1825 
1826 	len = (len < alloc_len) ? len : alloc_len;
1827 	return fill_from_dev_buffer(scp, arr, len);
1828 }
1829 
1830 /* <<Following mode page info copied from ST318451LW>> */
1831 
1832 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
1833 {	/* Read-Write Error Recovery page for mode_sense */
1834 	unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
1835 					5, 0, 0xff, 0xff};
1836 
1837 	memcpy(p, err_recov_pg, sizeof(err_recov_pg));
1838 	if (1 == pcontrol)
1839 		memset(p + 2, 0, sizeof(err_recov_pg) - 2);
1840 	return sizeof(err_recov_pg);
1841 }
1842 
1843 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
1844 { 	/* Disconnect-Reconnect page for mode_sense */
1845 	unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
1846 					 0, 0, 0, 0, 0, 0, 0, 0};
1847 
1848 	memcpy(p, disconnect_pg, sizeof(disconnect_pg));
1849 	if (1 == pcontrol)
1850 		memset(p + 2, 0, sizeof(disconnect_pg) - 2);
1851 	return sizeof(disconnect_pg);
1852 }
1853 
1854 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
1855 {       /* Format device page for mode_sense */
1856 	unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
1857 				     0, 0, 0, 0, 0, 0, 0, 0,
1858 				     0, 0, 0, 0, 0x40, 0, 0, 0};
1859 
1860 	memcpy(p, format_pg, sizeof(format_pg));
1861 	put_unaligned_be16(sdebug_sectors_per, p + 10);
1862 	put_unaligned_be16(sdebug_sector_size, p + 12);
1863 	if (sdebug_removable)
1864 		p[20] |= 0x20; /* should agree with INQUIRY */
1865 	if (1 == pcontrol)
1866 		memset(p + 2, 0, sizeof(format_pg) - 2);
1867 	return sizeof(format_pg);
1868 }
1869 
1870 static unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1871 				     0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,
1872 				     0, 0, 0, 0};
1873 
1874 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
1875 { 	/* Caching page for mode_sense */
1876 	unsigned char ch_caching_pg[] = {/* 0x8, 18, */ 0x4, 0, 0, 0, 0, 0,
1877 		0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
1878 	unsigned char d_caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1879 		0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
1880 
1881 	if (SDEBUG_OPT_N_WCE & sdebug_opts)
1882 		caching_pg[2] &= ~0x4;	/* set WCE=0 (default WCE=1) */
1883 	memcpy(p, caching_pg, sizeof(caching_pg));
1884 	if (1 == pcontrol)
1885 		memcpy(p + 2, ch_caching_pg, sizeof(ch_caching_pg));
1886 	else if (2 == pcontrol)
1887 		memcpy(p, d_caching_pg, sizeof(d_caching_pg));
1888 	return sizeof(caching_pg);
1889 }
1890 
1891 static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1892 				    0, 0, 0x2, 0x4b};
1893 
1894 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
1895 { 	/* Control mode page for mode_sense */
1896 	unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
1897 				        0, 0, 0, 0};
1898 	unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1899 				     0, 0, 0x2, 0x4b};
1900 
1901 	if (sdebug_dsense)
1902 		ctrl_m_pg[2] |= 0x4;
1903 	else
1904 		ctrl_m_pg[2] &= ~0x4;
1905 
1906 	if (sdebug_ato)
1907 		ctrl_m_pg[5] |= 0x80; /* ATO=1 */
1908 
1909 	memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
1910 	if (1 == pcontrol)
1911 		memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
1912 	else if (2 == pcontrol)
1913 		memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
1914 	return sizeof(ctrl_m_pg);
1915 }
1916 
1917 
1918 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
1919 {	/* Informational Exceptions control mode page for mode_sense */
1920 	unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
1921 				       0, 0, 0x0, 0x0};
1922 	unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1923 				      0, 0, 0x0, 0x0};
1924 
1925 	memcpy(p, iec_m_pg, sizeof(iec_m_pg));
1926 	if (1 == pcontrol)
1927 		memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
1928 	else if (2 == pcontrol)
1929 		memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
1930 	return sizeof(iec_m_pg);
1931 }
1932 
1933 static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
1934 {	/* SAS SSP mode page - short format for mode_sense */
1935 	unsigned char sas_sf_m_pg[] = {0x19, 0x6,
1936 		0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
1937 
1938 	memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
1939 	if (1 == pcontrol)
1940 		memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
1941 	return sizeof(sas_sf_m_pg);
1942 }
1943 
1944 
1945 static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
1946 			      int target_dev_id)
1947 {	/* SAS phy control and discover mode page for mode_sense */
1948 	unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
1949 		    0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
1950 		    0, 0, 0, 0, 0, 0, 0, 0,	/* insert SAS addr */
1951 		    0, 0, 0, 0, 0, 0, 0, 0,	/* insert SAS addr */
1952 		    0x2, 0, 0, 0, 0, 0, 0, 0,
1953 		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
1954 		    0, 0, 0, 0, 0, 0, 0, 0,
1955 		    0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
1956 		    0, 0, 0, 0, 0, 0, 0, 0,	/* insert SAS addr */
1957 		    0, 0, 0, 0, 0, 0, 0, 0,	/* insert SAS addr */
1958 		    0x3, 0, 0, 0, 0, 0, 0, 0,
1959 		    0x88, 0x99, 0, 0, 0, 0, 0, 0,
1960 		    0, 0, 0, 0, 0, 0, 0, 0,
1961 		};
1962 	int port_a, port_b;
1963 
1964 	put_unaligned_be64(naa3_comp_a, sas_pcd_m_pg + 16);
1965 	put_unaligned_be64(naa3_comp_c + 1, sas_pcd_m_pg + 24);
1966 	put_unaligned_be64(naa3_comp_a, sas_pcd_m_pg + 64);
1967 	put_unaligned_be64(naa3_comp_c + 1, sas_pcd_m_pg + 72);
1968 	port_a = target_dev_id + 1;
1969 	port_b = port_a + 1;
1970 	memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
1971 	put_unaligned_be32(port_a, p + 20);
1972 	put_unaligned_be32(port_b, p + 48 + 20);
1973 	if (1 == pcontrol)
1974 		memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
1975 	return sizeof(sas_pcd_m_pg);
1976 }
1977 
1978 static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
1979 {	/* SAS SSP shared protocol specific port mode subpage */
1980 	unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
1981 		    0, 0, 0, 0, 0, 0, 0, 0,
1982 		};
1983 
1984 	memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
1985 	if (1 == pcontrol)
1986 		memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
1987 	return sizeof(sas_sha_m_pg);
1988 }
1989 
1990 #define SDEBUG_MAX_MSENSE_SZ 256
1991 
1992 static int resp_mode_sense(struct scsi_cmnd *scp,
1993 			   struct sdebug_dev_info *devip)
1994 {
1995 	int pcontrol, pcode, subpcode, bd_len;
1996 	unsigned char dev_spec;
1997 	int alloc_len, offset, len, target_dev_id;
1998 	int target = scp->device->id;
1999 	unsigned char * ap;
2000 	unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
2001 	unsigned char *cmd = scp->cmnd;
2002 	bool dbd, llbaa, msense_6, is_disk, bad_pcode;
2003 
2004 	dbd = !!(cmd[1] & 0x8);		/* disable block descriptors */
2005 	pcontrol = (cmd[2] & 0xc0) >> 6;
2006 	pcode = cmd[2] & 0x3f;
2007 	subpcode = cmd[3];
2008 	msense_6 = (MODE_SENSE == cmd[0]);
2009 	llbaa = msense_6 ? false : !!(cmd[1] & 0x10);
2010 	is_disk = (sdebug_ptype == TYPE_DISK);
2011 	if (is_disk && !dbd)
2012 		bd_len = llbaa ? 16 : 8;
2013 	else
2014 		bd_len = 0;
2015 	alloc_len = msense_6 ? cmd[4] : get_unaligned_be16(cmd + 7);
2016 	memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
2017 	if (0x3 == pcontrol) {  /* Saving values not supported */
2018 		mk_sense_buffer(scp, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP, 0);
2019 		return check_condition_result;
2020 	}
2021 	target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
2022 			(devip->target * 1000) - 3;
2023 	/* for disks set DPOFUA bit and clear write protect (WP) bit */
2024 	if (is_disk)
2025 		dev_spec = 0x10;	/* =0x90 if WP=1 implies read-only */
2026 	else
2027 		dev_spec = 0x0;
2028 	if (msense_6) {
2029 		arr[2] = dev_spec;
2030 		arr[3] = bd_len;
2031 		offset = 4;
2032 	} else {
2033 		arr[3] = dev_spec;
2034 		if (16 == bd_len)
2035 			arr[4] = 0x1;	/* set LONGLBA bit */
2036 		arr[7] = bd_len;	/* assume 255 or less */
2037 		offset = 8;
2038 	}
2039 	ap = arr + offset;
2040 	if ((bd_len > 0) && (!sdebug_capacity))
2041 		sdebug_capacity = get_sdebug_capacity();
2042 
2043 	if (8 == bd_len) {
2044 		if (sdebug_capacity > 0xfffffffe)
2045 			put_unaligned_be32(0xffffffff, ap + 0);
2046 		else
2047 			put_unaligned_be32(sdebug_capacity, ap + 0);
2048 		put_unaligned_be16(sdebug_sector_size, ap + 6);
2049 		offset += bd_len;
2050 		ap = arr + offset;
2051 	} else if (16 == bd_len) {
2052 		put_unaligned_be64((u64)sdebug_capacity, ap + 0);
2053 		put_unaligned_be32(sdebug_sector_size, ap + 12);
2054 		offset += bd_len;
2055 		ap = arr + offset;
2056 	}
2057 
2058 	if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
2059 		/* TODO: Control Extension page */
2060 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
2061 		return check_condition_result;
2062 	}
2063 	bad_pcode = false;
2064 
2065 	switch (pcode) {
2066 	case 0x1:	/* Read-Write error recovery page, direct access */
2067 		len = resp_err_recov_pg(ap, pcontrol, target);
2068 		offset += len;
2069 		break;
2070 	case 0x2:	/* Disconnect-Reconnect page, all devices */
2071 		len = resp_disconnect_pg(ap, pcontrol, target);
2072 		offset += len;
2073 		break;
2074         case 0x3:       /* Format device page, direct access */
2075 		if (is_disk) {
2076 			len = resp_format_pg(ap, pcontrol, target);
2077 			offset += len;
2078 		} else
2079 			bad_pcode = true;
2080                 break;
2081 	case 0x8:	/* Caching page, direct access */
2082 		if (is_disk) {
2083 			len = resp_caching_pg(ap, pcontrol, target);
2084 			offset += len;
2085 		} else
2086 			bad_pcode = true;
2087 		break;
2088 	case 0xa:	/* Control Mode page, all devices */
2089 		len = resp_ctrl_m_pg(ap, pcontrol, target);
2090 		offset += len;
2091 		break;
2092 	case 0x19:	/* if spc==1 then sas phy, control+discover */
2093 		if ((subpcode > 0x2) && (subpcode < 0xff)) {
2094 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
2095 			return check_condition_result;
2096 	        }
2097 		len = 0;
2098 		if ((0x0 == subpcode) || (0xff == subpcode))
2099 			len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
2100 		if ((0x1 == subpcode) || (0xff == subpcode))
2101 			len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
2102 						  target_dev_id);
2103 		if ((0x2 == subpcode) || (0xff == subpcode))
2104 			len += resp_sas_sha_m_spg(ap + len, pcontrol);
2105 		offset += len;
2106 		break;
2107 	case 0x1c:	/* Informational Exceptions Mode page, all devices */
2108 		len = resp_iec_m_pg(ap, pcontrol, target);
2109 		offset += len;
2110 		break;
2111 	case 0x3f:	/* Read all Mode pages */
2112 		if ((0 == subpcode) || (0xff == subpcode)) {
2113 			len = resp_err_recov_pg(ap, pcontrol, target);
2114 			len += resp_disconnect_pg(ap + len, pcontrol, target);
2115 			if (is_disk) {
2116 				len += resp_format_pg(ap + len, pcontrol,
2117 						      target);
2118 				len += resp_caching_pg(ap + len, pcontrol,
2119 						       target);
2120 			}
2121 			len += resp_ctrl_m_pg(ap + len, pcontrol, target);
2122 			len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
2123 			if (0xff == subpcode) {
2124 				len += resp_sas_pcd_m_spg(ap + len, pcontrol,
2125 						  target, target_dev_id);
2126 				len += resp_sas_sha_m_spg(ap + len, pcontrol);
2127 			}
2128 			len += resp_iec_m_pg(ap + len, pcontrol, target);
2129 			offset += len;
2130 		} else {
2131 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
2132 			return check_condition_result;
2133                 }
2134 		break;
2135 	default:
2136 		bad_pcode = true;
2137 		break;
2138 	}
2139 	if (bad_pcode) {
2140 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
2141 		return check_condition_result;
2142 	}
2143 	if (msense_6)
2144 		arr[0] = offset - 1;
2145 	else
2146 		put_unaligned_be16((offset - 2), arr + 0);
2147 	return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
2148 }
2149 
2150 #define SDEBUG_MAX_MSELECT_SZ 512
2151 
2152 static int resp_mode_select(struct scsi_cmnd *scp,
2153 			    struct sdebug_dev_info *devip)
2154 {
2155 	int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
2156 	int param_len, res, mpage;
2157 	unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
2158 	unsigned char *cmd = scp->cmnd;
2159 	int mselect6 = (MODE_SELECT == cmd[0]);
2160 
2161 	memset(arr, 0, sizeof(arr));
2162 	pf = cmd[1] & 0x10;
2163 	sp = cmd[1] & 0x1;
2164 	param_len = mselect6 ? cmd[4] : get_unaligned_be16(cmd + 7);
2165 	if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
2166 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, mselect6 ? 4 : 7, -1);
2167 		return check_condition_result;
2168 	}
2169         res = fetch_to_dev_buffer(scp, arr, param_len);
2170         if (-1 == res)
2171 		return DID_ERROR << 16;
2172 	else if (sdebug_verbose && (res < param_len))
2173 		sdev_printk(KERN_INFO, scp->device,
2174 			    "%s: cdb indicated=%d, IO sent=%d bytes\n",
2175 			    __func__, param_len, res);
2176 	md_len = mselect6 ? (arr[0] + 1) : (get_unaligned_be16(arr + 0) + 2);
2177 	bd_len = mselect6 ? arr[3] : get_unaligned_be16(arr + 6);
2178 	if (md_len > 2) {
2179 		mk_sense_invalid_fld(scp, SDEB_IN_DATA, 0, -1);
2180 		return check_condition_result;
2181 	}
2182 	off = bd_len + (mselect6 ? 4 : 8);
2183 	mpage = arr[off] & 0x3f;
2184 	ps = !!(arr[off] & 0x80);
2185 	if (ps) {
2186 		mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 7);
2187 		return check_condition_result;
2188 	}
2189 	spf = !!(arr[off] & 0x40);
2190 	pg_len = spf ? (get_unaligned_be16(arr + off + 2) + 4) :
2191 		       (arr[off + 1] + 2);
2192 	if ((pg_len + off) > param_len) {
2193 		mk_sense_buffer(scp, ILLEGAL_REQUEST,
2194 				PARAMETER_LIST_LENGTH_ERR, 0);
2195 		return check_condition_result;
2196 	}
2197 	switch (mpage) {
2198 	case 0x8:      /* Caching Mode page */
2199 		if (caching_pg[1] == arr[off + 1]) {
2200 			memcpy(caching_pg + 2, arr + off + 2,
2201 			       sizeof(caching_pg) - 2);
2202 			goto set_mode_changed_ua;
2203 		}
2204 		break;
2205 	case 0xa:      /* Control Mode page */
2206 		if (ctrl_m_pg[1] == arr[off + 1]) {
2207 			memcpy(ctrl_m_pg + 2, arr + off + 2,
2208 			       sizeof(ctrl_m_pg) - 2);
2209 			sdebug_dsense = !!(ctrl_m_pg[2] & 0x4);
2210 			goto set_mode_changed_ua;
2211 		}
2212 		break;
2213 	case 0x1c:      /* Informational Exceptions Mode page */
2214 		if (iec_m_pg[1] == arr[off + 1]) {
2215 			memcpy(iec_m_pg + 2, arr + off + 2,
2216 			       sizeof(iec_m_pg) - 2);
2217 			goto set_mode_changed_ua;
2218 		}
2219 		break;
2220 	default:
2221 		break;
2222 	}
2223 	mk_sense_invalid_fld(scp, SDEB_IN_DATA, off, 5);
2224 	return check_condition_result;
2225 set_mode_changed_ua:
2226 	set_bit(SDEBUG_UA_MODE_CHANGED, devip->uas_bm);
2227 	return 0;
2228 }
2229 
2230 static int resp_temp_l_pg(unsigned char * arr)
2231 {
2232 	unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
2233 				     0x0, 0x1, 0x3, 0x2, 0x0, 65,
2234 		};
2235 
2236         memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
2237         return sizeof(temp_l_pg);
2238 }
2239 
2240 static int resp_ie_l_pg(unsigned char * arr)
2241 {
2242 	unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
2243 		};
2244 
2245         memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
2246 	if (iec_m_pg[2] & 0x4) {	/* TEST bit set */
2247 		arr[4] = THRESHOLD_EXCEEDED;
2248 		arr[5] = 0xff;
2249 	}
2250         return sizeof(ie_l_pg);
2251 }
2252 
2253 #define SDEBUG_MAX_LSENSE_SZ 512
2254 
2255 static int resp_log_sense(struct scsi_cmnd * scp,
2256                           struct sdebug_dev_info * devip)
2257 {
2258 	int ppc, sp, pcontrol, pcode, subpcode, alloc_len, len, n;
2259 	unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
2260 	unsigned char *cmd = scp->cmnd;
2261 
2262 	memset(arr, 0, sizeof(arr));
2263 	ppc = cmd[1] & 0x2;
2264 	sp = cmd[1] & 0x1;
2265 	if (ppc || sp) {
2266 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, ppc ? 1 : 0);
2267 		return check_condition_result;
2268 	}
2269 	pcontrol = (cmd[2] & 0xc0) >> 6;
2270 	pcode = cmd[2] & 0x3f;
2271 	subpcode = cmd[3] & 0xff;
2272 	alloc_len = get_unaligned_be16(cmd + 7);
2273 	arr[0] = pcode;
2274 	if (0 == subpcode) {
2275 		switch (pcode) {
2276 		case 0x0:	/* Supported log pages log page */
2277 			n = 4;
2278 			arr[n++] = 0x0;		/* this page */
2279 			arr[n++] = 0xd;		/* Temperature */
2280 			arr[n++] = 0x2f;	/* Informational exceptions */
2281 			arr[3] = n - 4;
2282 			break;
2283 		case 0xd:	/* Temperature log page */
2284 			arr[3] = resp_temp_l_pg(arr + 4);
2285 			break;
2286 		case 0x2f:	/* Informational exceptions log page */
2287 			arr[3] = resp_ie_l_pg(arr + 4);
2288 			break;
2289 		default:
2290 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
2291 			return check_condition_result;
2292 		}
2293 	} else if (0xff == subpcode) {
2294 		arr[0] |= 0x40;
2295 		arr[1] = subpcode;
2296 		switch (pcode) {
2297 		case 0x0:	/* Supported log pages and subpages log page */
2298 			n = 4;
2299 			arr[n++] = 0x0;
2300 			arr[n++] = 0x0;		/* 0,0 page */
2301 			arr[n++] = 0x0;
2302 			arr[n++] = 0xff;	/* this page */
2303 			arr[n++] = 0xd;
2304 			arr[n++] = 0x0;		/* Temperature */
2305 			arr[n++] = 0x2f;
2306 			arr[n++] = 0x0;	/* Informational exceptions */
2307 			arr[3] = n - 4;
2308 			break;
2309 		case 0xd:	/* Temperature subpages */
2310 			n = 4;
2311 			arr[n++] = 0xd;
2312 			arr[n++] = 0x0;		/* Temperature */
2313 			arr[3] = n - 4;
2314 			break;
2315 		case 0x2f:	/* Informational exceptions subpages */
2316 			n = 4;
2317 			arr[n++] = 0x2f;
2318 			arr[n++] = 0x0;		/* Informational exceptions */
2319 			arr[3] = n - 4;
2320 			break;
2321 		default:
2322 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, 5);
2323 			return check_condition_result;
2324 		}
2325 	} else {
2326 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 3, -1);
2327 		return check_condition_result;
2328 	}
2329 	len = min(get_unaligned_be16(arr + 2) + 4, alloc_len);
2330 	return fill_from_dev_buffer(scp, arr,
2331 		    min(len, SDEBUG_MAX_INQ_ARR_SZ));
2332 }
2333 
2334 static int check_device_access_params(struct scsi_cmnd *scp,
2335 				      unsigned long long lba, unsigned int num)
2336 {
2337 	if (lba + num > sdebug_capacity) {
2338 		mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0);
2339 		return check_condition_result;
2340 	}
2341 	/* transfer length excessive (tie in to block limits VPD page) */
2342 	if (num > sdebug_store_sectors) {
2343 		/* needs work to find which cdb byte 'num' comes from */
2344 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
2345 		return check_condition_result;
2346 	}
2347 	return 0;
2348 }
2349 
2350 /* Returns number of bytes copied or -1 if error. */
2351 static int do_device_access(struct scsi_cmnd *scmd, u64 lba, u32 num,
2352 			    bool do_write)
2353 {
2354 	int ret;
2355 	u64 block, rest = 0;
2356 	struct scsi_data_buffer *sdb;
2357 	enum dma_data_direction dir;
2358 
2359 	if (do_write) {
2360 		sdb = scsi_out(scmd);
2361 		dir = DMA_TO_DEVICE;
2362 	} else {
2363 		sdb = scsi_in(scmd);
2364 		dir = DMA_FROM_DEVICE;
2365 	}
2366 
2367 	if (!sdb->length)
2368 		return 0;
2369 	if (!(scsi_bidi_cmnd(scmd) || scmd->sc_data_direction == dir))
2370 		return -1;
2371 
2372 	block = do_div(lba, sdebug_store_sectors);
2373 	if (block + num > sdebug_store_sectors)
2374 		rest = block + num - sdebug_store_sectors;
2375 
2376 	ret = sg_copy_buffer(sdb->table.sgl, sdb->table.nents,
2377 		   fake_storep + (block * sdebug_sector_size),
2378 		   (num - rest) * sdebug_sector_size, 0, do_write);
2379 	if (ret != (num - rest) * sdebug_sector_size)
2380 		return ret;
2381 
2382 	if (rest) {
2383 		ret += sg_copy_buffer(sdb->table.sgl, sdb->table.nents,
2384 			    fake_storep, rest * sdebug_sector_size,
2385 			    (num - rest) * sdebug_sector_size, do_write);
2386 	}
2387 
2388 	return ret;
2389 }
2390 
2391 /* If fake_store(lba,num) compares equal to arr(num), then copy top half of
2392  * arr into fake_store(lba,num) and return true. If comparison fails then
2393  * return false. */
2394 static bool comp_write_worker(u64 lba, u32 num, const u8 *arr)
2395 {
2396 	bool res;
2397 	u64 block, rest = 0;
2398 	u32 store_blks = sdebug_store_sectors;
2399 	u32 lb_size = sdebug_sector_size;
2400 
2401 	block = do_div(lba, store_blks);
2402 	if (block + num > store_blks)
2403 		rest = block + num - store_blks;
2404 
2405 	res = !memcmp(fake_storep + (block * lb_size), arr,
2406 		      (num - rest) * lb_size);
2407 	if (!res)
2408 		return res;
2409 	if (rest)
2410 		res = memcmp(fake_storep, arr + ((num - rest) * lb_size),
2411 			     rest * lb_size);
2412 	if (!res)
2413 		return res;
2414 	arr += num * lb_size;
2415 	memcpy(fake_storep + (block * lb_size), arr, (num - rest) * lb_size);
2416 	if (rest)
2417 		memcpy(fake_storep, arr + ((num - rest) * lb_size),
2418 		       rest * lb_size);
2419 	return res;
2420 }
2421 
2422 static __be16 dif_compute_csum(const void *buf, int len)
2423 {
2424 	__be16 csum;
2425 
2426 	if (sdebug_guard)
2427 		csum = (__force __be16)ip_compute_csum(buf, len);
2428 	else
2429 		csum = cpu_to_be16(crc_t10dif(buf, len));
2430 
2431 	return csum;
2432 }
2433 
2434 static int dif_verify(struct t10_pi_tuple *sdt, const void *data,
2435 		      sector_t sector, u32 ei_lba)
2436 {
2437 	__be16 csum = dif_compute_csum(data, sdebug_sector_size);
2438 
2439 	if (sdt->guard_tag != csum) {
2440 		pr_err("GUARD check failed on sector %lu rcvd 0x%04x, data 0x%04x\n",
2441 			(unsigned long)sector,
2442 			be16_to_cpu(sdt->guard_tag),
2443 			be16_to_cpu(csum));
2444 		return 0x01;
2445 	}
2446 	if (sdebug_dif == T10_PI_TYPE1_PROTECTION &&
2447 	    be32_to_cpu(sdt->ref_tag) != (sector & 0xffffffff)) {
2448 		pr_err("REF check failed on sector %lu\n",
2449 			(unsigned long)sector);
2450 		return 0x03;
2451 	}
2452 	if (sdebug_dif == T10_PI_TYPE2_PROTECTION &&
2453 	    be32_to_cpu(sdt->ref_tag) != ei_lba) {
2454 		pr_err("REF check failed on sector %lu\n",
2455 			(unsigned long)sector);
2456 		return 0x03;
2457 	}
2458 	return 0;
2459 }
2460 
2461 static void dif_copy_prot(struct scsi_cmnd *SCpnt, sector_t sector,
2462 			  unsigned int sectors, bool read)
2463 {
2464 	size_t resid;
2465 	void *paddr;
2466 	const void *dif_store_end = dif_storep + sdebug_store_sectors;
2467 	struct sg_mapping_iter miter;
2468 
2469 	/* Bytes of protection data to copy into sgl */
2470 	resid = sectors * sizeof(*dif_storep);
2471 
2472 	sg_miter_start(&miter, scsi_prot_sglist(SCpnt),
2473 			scsi_prot_sg_count(SCpnt), SG_MITER_ATOMIC |
2474 			(read ? SG_MITER_TO_SG : SG_MITER_FROM_SG));
2475 
2476 	while (sg_miter_next(&miter) && resid > 0) {
2477 		size_t len = min(miter.length, resid);
2478 		void *start = dif_store(sector);
2479 		size_t rest = 0;
2480 
2481 		if (dif_store_end < start + len)
2482 			rest = start + len - dif_store_end;
2483 
2484 		paddr = miter.addr;
2485 
2486 		if (read)
2487 			memcpy(paddr, start, len - rest);
2488 		else
2489 			memcpy(start, paddr, len - rest);
2490 
2491 		if (rest) {
2492 			if (read)
2493 				memcpy(paddr + len - rest, dif_storep, rest);
2494 			else
2495 				memcpy(dif_storep, paddr + len - rest, rest);
2496 		}
2497 
2498 		sector += len / sizeof(*dif_storep);
2499 		resid -= len;
2500 	}
2501 	sg_miter_stop(&miter);
2502 }
2503 
2504 static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
2505 			    unsigned int sectors, u32 ei_lba)
2506 {
2507 	unsigned int i;
2508 	struct t10_pi_tuple *sdt;
2509 	sector_t sector;
2510 
2511 	for (i = 0; i < sectors; i++, ei_lba++) {
2512 		int ret;
2513 
2514 		sector = start_sec + i;
2515 		sdt = dif_store(sector);
2516 
2517 		if (sdt->app_tag == cpu_to_be16(0xffff))
2518 			continue;
2519 
2520 		ret = dif_verify(sdt, fake_store(sector), sector, ei_lba);
2521 		if (ret) {
2522 			dif_errors++;
2523 			return ret;
2524 		}
2525 	}
2526 
2527 	dif_copy_prot(SCpnt, start_sec, sectors, true);
2528 	dix_reads++;
2529 
2530 	return 0;
2531 }
2532 
2533 static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
2534 {
2535 	u8 *cmd = scp->cmnd;
2536 	struct sdebug_queued_cmd *sqcp;
2537 	u64 lba;
2538 	u32 num;
2539 	u32 ei_lba;
2540 	unsigned long iflags;
2541 	int ret;
2542 	bool check_prot;
2543 
2544 	switch (cmd[0]) {
2545 	case READ_16:
2546 		ei_lba = 0;
2547 		lba = get_unaligned_be64(cmd + 2);
2548 		num = get_unaligned_be32(cmd + 10);
2549 		check_prot = true;
2550 		break;
2551 	case READ_10:
2552 		ei_lba = 0;
2553 		lba = get_unaligned_be32(cmd + 2);
2554 		num = get_unaligned_be16(cmd + 7);
2555 		check_prot = true;
2556 		break;
2557 	case READ_6:
2558 		ei_lba = 0;
2559 		lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
2560 		      (u32)(cmd[1] & 0x1f) << 16;
2561 		num = (0 == cmd[4]) ? 256 : cmd[4];
2562 		check_prot = true;
2563 		break;
2564 	case READ_12:
2565 		ei_lba = 0;
2566 		lba = get_unaligned_be32(cmd + 2);
2567 		num = get_unaligned_be32(cmd + 6);
2568 		check_prot = true;
2569 		break;
2570 	case XDWRITEREAD_10:
2571 		ei_lba = 0;
2572 		lba = get_unaligned_be32(cmd + 2);
2573 		num = get_unaligned_be16(cmd + 7);
2574 		check_prot = false;
2575 		break;
2576 	default:	/* assume READ(32) */
2577 		lba = get_unaligned_be64(cmd + 12);
2578 		ei_lba = get_unaligned_be32(cmd + 20);
2579 		num = get_unaligned_be32(cmd + 28);
2580 		check_prot = false;
2581 		break;
2582 	}
2583 	if (unlikely(have_dif_prot && check_prot)) {
2584 		if (sdebug_dif == T10_PI_TYPE2_PROTECTION &&
2585 		    (cmd[1] & 0xe0)) {
2586 			mk_sense_invalid_opcode(scp);
2587 			return check_condition_result;
2588 		}
2589 		if ((sdebug_dif == T10_PI_TYPE1_PROTECTION ||
2590 		     sdebug_dif == T10_PI_TYPE3_PROTECTION) &&
2591 		    (cmd[1] & 0xe0) == 0)
2592 			sdev_printk(KERN_ERR, scp->device, "Unprotected RD "
2593 				    "to DIF device\n");
2594 	}
2595 	if (unlikely(sdebug_any_injecting_opt)) {
2596 		sqcp = (struct sdebug_queued_cmd *)scp->host_scribble;
2597 
2598 		if (sqcp) {
2599 			if (sqcp->inj_short)
2600 				num /= 2;
2601 		}
2602 	} else
2603 		sqcp = NULL;
2604 
2605 	/* inline check_device_access_params() */
2606 	if (unlikely(lba + num > sdebug_capacity)) {
2607 		mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0);
2608 		return check_condition_result;
2609 	}
2610 	/* transfer length excessive (tie in to block limits VPD page) */
2611 	if (unlikely(num > sdebug_store_sectors)) {
2612 		/* needs work to find which cdb byte 'num' comes from */
2613 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
2614 		return check_condition_result;
2615 	}
2616 
2617 	if (unlikely((SDEBUG_OPT_MEDIUM_ERR & sdebug_opts) &&
2618 		     (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) &&
2619 		     ((lba + num) > OPT_MEDIUM_ERR_ADDR))) {
2620 		/* claim unrecoverable read error */
2621 		mk_sense_buffer(scp, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0);
2622 		/* set info field and valid bit for fixed descriptor */
2623 		if (0x70 == (scp->sense_buffer[0] & 0x7f)) {
2624 			scp->sense_buffer[0] |= 0x80;	/* Valid bit */
2625 			ret = (lba < OPT_MEDIUM_ERR_ADDR)
2626 			      ? OPT_MEDIUM_ERR_ADDR : (int)lba;
2627 			put_unaligned_be32(ret, scp->sense_buffer + 3);
2628 		}
2629 		scsi_set_resid(scp, scsi_bufflen(scp));
2630 		return check_condition_result;
2631 	}
2632 
2633 	read_lock_irqsave(&atomic_rw, iflags);
2634 
2635 	/* DIX + T10 DIF */
2636 	if (unlikely(sdebug_dix && scsi_prot_sg_count(scp))) {
2637 		int prot_ret = prot_verify_read(scp, lba, num, ei_lba);
2638 
2639 		if (prot_ret) {
2640 			read_unlock_irqrestore(&atomic_rw, iflags);
2641 			mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, prot_ret);
2642 			return illegal_condition_result;
2643 		}
2644 	}
2645 
2646 	ret = do_device_access(scp, lba, num, false);
2647 	read_unlock_irqrestore(&atomic_rw, iflags);
2648 	if (unlikely(ret == -1))
2649 		return DID_ERROR << 16;
2650 
2651 	scsi_in(scp)->resid = scsi_bufflen(scp) - ret;
2652 
2653 	if (unlikely(sqcp)) {
2654 		if (sqcp->inj_recovered) {
2655 			mk_sense_buffer(scp, RECOVERED_ERROR,
2656 					THRESHOLD_EXCEEDED, 0);
2657 			return check_condition_result;
2658 		} else if (sqcp->inj_transport) {
2659 			mk_sense_buffer(scp, ABORTED_COMMAND,
2660 					TRANSPORT_PROBLEM, ACK_NAK_TO);
2661 			return check_condition_result;
2662 		} else if (sqcp->inj_dif) {
2663 			/* Logical block guard check failed */
2664 			mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1);
2665 			return illegal_condition_result;
2666 		} else if (sqcp->inj_dix) {
2667 			mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1);
2668 			return illegal_condition_result;
2669 		}
2670 	}
2671 	return 0;
2672 }
2673 
2674 static void dump_sector(unsigned char *buf, int len)
2675 {
2676 	int i, j, n;
2677 
2678 	pr_err(">>> Sector Dump <<<\n");
2679 	for (i = 0 ; i < len ; i += 16) {
2680 		char b[128];
2681 
2682 		for (j = 0, n = 0; j < 16; j++) {
2683 			unsigned char c = buf[i+j];
2684 
2685 			if (c >= 0x20 && c < 0x7e)
2686 				n += scnprintf(b + n, sizeof(b) - n,
2687 					       " %c ", buf[i+j]);
2688 			else
2689 				n += scnprintf(b + n, sizeof(b) - n,
2690 					       "%02x ", buf[i+j]);
2691 		}
2692 		pr_err("%04d: %s\n", i, b);
2693 	}
2694 }
2695 
2696 static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
2697 			     unsigned int sectors, u32 ei_lba)
2698 {
2699 	int ret;
2700 	struct t10_pi_tuple *sdt;
2701 	void *daddr;
2702 	sector_t sector = start_sec;
2703 	int ppage_offset;
2704 	int dpage_offset;
2705 	struct sg_mapping_iter diter;
2706 	struct sg_mapping_iter piter;
2707 
2708 	BUG_ON(scsi_sg_count(SCpnt) == 0);
2709 	BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
2710 
2711 	sg_miter_start(&piter, scsi_prot_sglist(SCpnt),
2712 			scsi_prot_sg_count(SCpnt),
2713 			SG_MITER_ATOMIC | SG_MITER_FROM_SG);
2714 	sg_miter_start(&diter, scsi_sglist(SCpnt), scsi_sg_count(SCpnt),
2715 			SG_MITER_ATOMIC | SG_MITER_FROM_SG);
2716 
2717 	/* For each protection page */
2718 	while (sg_miter_next(&piter)) {
2719 		dpage_offset = 0;
2720 		if (WARN_ON(!sg_miter_next(&diter))) {
2721 			ret = 0x01;
2722 			goto out;
2723 		}
2724 
2725 		for (ppage_offset = 0; ppage_offset < piter.length;
2726 		     ppage_offset += sizeof(struct t10_pi_tuple)) {
2727 			/* If we're at the end of the current
2728 			 * data page advance to the next one
2729 			 */
2730 			if (dpage_offset >= diter.length) {
2731 				if (WARN_ON(!sg_miter_next(&diter))) {
2732 					ret = 0x01;
2733 					goto out;
2734 				}
2735 				dpage_offset = 0;
2736 			}
2737 
2738 			sdt = piter.addr + ppage_offset;
2739 			daddr = diter.addr + dpage_offset;
2740 
2741 			ret = dif_verify(sdt, daddr, sector, ei_lba);
2742 			if (ret) {
2743 				dump_sector(daddr, sdebug_sector_size);
2744 				goto out;
2745 			}
2746 
2747 			sector++;
2748 			ei_lba++;
2749 			dpage_offset += sdebug_sector_size;
2750 		}
2751 		diter.consumed = dpage_offset;
2752 		sg_miter_stop(&diter);
2753 	}
2754 	sg_miter_stop(&piter);
2755 
2756 	dif_copy_prot(SCpnt, start_sec, sectors, false);
2757 	dix_writes++;
2758 
2759 	return 0;
2760 
2761 out:
2762 	dif_errors++;
2763 	sg_miter_stop(&diter);
2764 	sg_miter_stop(&piter);
2765 	return ret;
2766 }
2767 
2768 static unsigned long lba_to_map_index(sector_t lba)
2769 {
2770 	if (sdebug_unmap_alignment)
2771 		lba += sdebug_unmap_granularity - sdebug_unmap_alignment;
2772 	sector_div(lba, sdebug_unmap_granularity);
2773 	return lba;
2774 }
2775 
2776 static sector_t map_index_to_lba(unsigned long index)
2777 {
2778 	sector_t lba = index * sdebug_unmap_granularity;
2779 
2780 	if (sdebug_unmap_alignment)
2781 		lba -= sdebug_unmap_granularity - sdebug_unmap_alignment;
2782 	return lba;
2783 }
2784 
2785 static unsigned int map_state(sector_t lba, unsigned int *num)
2786 {
2787 	sector_t end;
2788 	unsigned int mapped;
2789 	unsigned long index;
2790 	unsigned long next;
2791 
2792 	index = lba_to_map_index(lba);
2793 	mapped = test_bit(index, map_storep);
2794 
2795 	if (mapped)
2796 		next = find_next_zero_bit(map_storep, map_size, index);
2797 	else
2798 		next = find_next_bit(map_storep, map_size, index);
2799 
2800 	end = min_t(sector_t, sdebug_store_sectors,  map_index_to_lba(next));
2801 	*num = end - lba;
2802 	return mapped;
2803 }
2804 
2805 static void map_region(sector_t lba, unsigned int len)
2806 {
2807 	sector_t end = lba + len;
2808 
2809 	while (lba < end) {
2810 		unsigned long index = lba_to_map_index(lba);
2811 
2812 		if (index < map_size)
2813 			set_bit(index, map_storep);
2814 
2815 		lba = map_index_to_lba(index + 1);
2816 	}
2817 }
2818 
2819 static void unmap_region(sector_t lba, unsigned int len)
2820 {
2821 	sector_t end = lba + len;
2822 
2823 	while (lba < end) {
2824 		unsigned long index = lba_to_map_index(lba);
2825 
2826 		if (lba == map_index_to_lba(index) &&
2827 		    lba + sdebug_unmap_granularity <= end &&
2828 		    index < map_size) {
2829 			clear_bit(index, map_storep);
2830 			if (sdebug_lbprz) {  /* for LBPRZ=2 return 0xff_s */
2831 				memset(fake_storep +
2832 				       lba * sdebug_sector_size,
2833 				       (sdebug_lbprz & 1) ? 0 : 0xff,
2834 				       sdebug_sector_size *
2835 				       sdebug_unmap_granularity);
2836 			}
2837 			if (dif_storep) {
2838 				memset(dif_storep + lba, 0xff,
2839 				       sizeof(*dif_storep) *
2840 				       sdebug_unmap_granularity);
2841 			}
2842 		}
2843 		lba = map_index_to_lba(index + 1);
2844 	}
2845 }
2846 
2847 static int resp_write_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
2848 {
2849 	u8 *cmd = scp->cmnd;
2850 	u64 lba;
2851 	u32 num;
2852 	u32 ei_lba;
2853 	unsigned long iflags;
2854 	int ret;
2855 	bool check_prot;
2856 
2857 	switch (cmd[0]) {
2858 	case WRITE_16:
2859 		ei_lba = 0;
2860 		lba = get_unaligned_be64(cmd + 2);
2861 		num = get_unaligned_be32(cmd + 10);
2862 		check_prot = true;
2863 		break;
2864 	case WRITE_10:
2865 		ei_lba = 0;
2866 		lba = get_unaligned_be32(cmd + 2);
2867 		num = get_unaligned_be16(cmd + 7);
2868 		check_prot = true;
2869 		break;
2870 	case WRITE_6:
2871 		ei_lba = 0;
2872 		lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
2873 		      (u32)(cmd[1] & 0x1f) << 16;
2874 		num = (0 == cmd[4]) ? 256 : cmd[4];
2875 		check_prot = true;
2876 		break;
2877 	case WRITE_12:
2878 		ei_lba = 0;
2879 		lba = get_unaligned_be32(cmd + 2);
2880 		num = get_unaligned_be32(cmd + 6);
2881 		check_prot = true;
2882 		break;
2883 	case 0x53:	/* XDWRITEREAD(10) */
2884 		ei_lba = 0;
2885 		lba = get_unaligned_be32(cmd + 2);
2886 		num = get_unaligned_be16(cmd + 7);
2887 		check_prot = false;
2888 		break;
2889 	default:	/* assume WRITE(32) */
2890 		lba = get_unaligned_be64(cmd + 12);
2891 		ei_lba = get_unaligned_be32(cmd + 20);
2892 		num = get_unaligned_be32(cmd + 28);
2893 		check_prot = false;
2894 		break;
2895 	}
2896 	if (unlikely(have_dif_prot && check_prot)) {
2897 		if (sdebug_dif == T10_PI_TYPE2_PROTECTION &&
2898 		    (cmd[1] & 0xe0)) {
2899 			mk_sense_invalid_opcode(scp);
2900 			return check_condition_result;
2901 		}
2902 		if ((sdebug_dif == T10_PI_TYPE1_PROTECTION ||
2903 		     sdebug_dif == T10_PI_TYPE3_PROTECTION) &&
2904 		    (cmd[1] & 0xe0) == 0)
2905 			sdev_printk(KERN_ERR, scp->device, "Unprotected WR "
2906 				    "to DIF device\n");
2907 	}
2908 
2909 	/* inline check_device_access_params() */
2910 	if (unlikely(lba + num > sdebug_capacity)) {
2911 		mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0);
2912 		return check_condition_result;
2913 	}
2914 	/* transfer length excessive (tie in to block limits VPD page) */
2915 	if (unlikely(num > sdebug_store_sectors)) {
2916 		/* needs work to find which cdb byte 'num' comes from */
2917 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
2918 		return check_condition_result;
2919 	}
2920 
2921 	write_lock_irqsave(&atomic_rw, iflags);
2922 
2923 	/* DIX + T10 DIF */
2924 	if (unlikely(sdebug_dix && scsi_prot_sg_count(scp))) {
2925 		int prot_ret = prot_verify_write(scp, lba, num, ei_lba);
2926 
2927 		if (prot_ret) {
2928 			write_unlock_irqrestore(&atomic_rw, iflags);
2929 			mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, prot_ret);
2930 			return illegal_condition_result;
2931 		}
2932 	}
2933 
2934 	ret = do_device_access(scp, lba, num, true);
2935 	if (unlikely(scsi_debug_lbp()))
2936 		map_region(lba, num);
2937 	write_unlock_irqrestore(&atomic_rw, iflags);
2938 	if (unlikely(-1 == ret))
2939 		return DID_ERROR << 16;
2940 	else if (unlikely(sdebug_verbose &&
2941 			  (ret < (num * sdebug_sector_size))))
2942 		sdev_printk(KERN_INFO, scp->device,
2943 			    "%s: write: cdb indicated=%u, IO sent=%d bytes\n",
2944 			    my_name, num * sdebug_sector_size, ret);
2945 
2946 	if (unlikely(sdebug_any_injecting_opt)) {
2947 		struct sdebug_queued_cmd *sqcp =
2948 				(struct sdebug_queued_cmd *)scp->host_scribble;
2949 
2950 		if (sqcp) {
2951 			if (sqcp->inj_recovered) {
2952 				mk_sense_buffer(scp, RECOVERED_ERROR,
2953 						THRESHOLD_EXCEEDED, 0);
2954 				return check_condition_result;
2955 			} else if (sqcp->inj_dif) {
2956 				/* Logical block guard check failed */
2957 				mk_sense_buffer(scp, ABORTED_COMMAND, 0x10, 1);
2958 				return illegal_condition_result;
2959 			} else if (sqcp->inj_dix) {
2960 				mk_sense_buffer(scp, ILLEGAL_REQUEST, 0x10, 1);
2961 				return illegal_condition_result;
2962 			}
2963 		}
2964 	}
2965 	return 0;
2966 }
2967 
2968 static int resp_write_same(struct scsi_cmnd *scp, u64 lba, u32 num,
2969 			   u32 ei_lba, bool unmap, bool ndob)
2970 {
2971 	unsigned long iflags;
2972 	unsigned long long i;
2973 	int ret;
2974 	u64 lba_off;
2975 
2976 	ret = check_device_access_params(scp, lba, num);
2977 	if (ret)
2978 		return ret;
2979 
2980 	write_lock_irqsave(&atomic_rw, iflags);
2981 
2982 	if (unmap && scsi_debug_lbp()) {
2983 		unmap_region(lba, num);
2984 		goto out;
2985 	}
2986 
2987 	lba_off = lba * sdebug_sector_size;
2988 	/* if ndob then zero 1 logical block, else fetch 1 logical block */
2989 	if (ndob) {
2990 		memset(fake_storep + lba_off, 0, sdebug_sector_size);
2991 		ret = 0;
2992 	} else
2993 		ret = fetch_to_dev_buffer(scp, fake_storep + lba_off,
2994 					  sdebug_sector_size);
2995 
2996 	if (-1 == ret) {
2997 		write_unlock_irqrestore(&atomic_rw, iflags);
2998 		return DID_ERROR << 16;
2999 	} else if (sdebug_verbose && (ret < (num * sdebug_sector_size)))
3000 		sdev_printk(KERN_INFO, scp->device,
3001 			    "%s: %s: cdb indicated=%u, IO sent=%d bytes\n",
3002 			    my_name, "write same",
3003 			    num * sdebug_sector_size, ret);
3004 
3005 	/* Copy first sector to remaining blocks */
3006 	for (i = 1 ; i < num ; i++)
3007 		memcpy(fake_storep + ((lba + i) * sdebug_sector_size),
3008 		       fake_storep + lba_off,
3009 		       sdebug_sector_size);
3010 
3011 	if (scsi_debug_lbp())
3012 		map_region(lba, num);
3013 out:
3014 	write_unlock_irqrestore(&atomic_rw, iflags);
3015 
3016 	return 0;
3017 }
3018 
3019 static int resp_write_same_10(struct scsi_cmnd *scp,
3020 			      struct sdebug_dev_info *devip)
3021 {
3022 	u8 *cmd = scp->cmnd;
3023 	u32 lba;
3024 	u16 num;
3025 	u32 ei_lba = 0;
3026 	bool unmap = false;
3027 
3028 	if (cmd[1] & 0x8) {
3029 		if (sdebug_lbpws10 == 0) {
3030 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3);
3031 			return check_condition_result;
3032 		} else
3033 			unmap = true;
3034 	}
3035 	lba = get_unaligned_be32(cmd + 2);
3036 	num = get_unaligned_be16(cmd + 7);
3037 	if (num > sdebug_write_same_length) {
3038 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1);
3039 		return check_condition_result;
3040 	}
3041 	return resp_write_same(scp, lba, num, ei_lba, unmap, false);
3042 }
3043 
3044 static int resp_write_same_16(struct scsi_cmnd *scp,
3045 			      struct sdebug_dev_info *devip)
3046 {
3047 	u8 *cmd = scp->cmnd;
3048 	u64 lba;
3049 	u32 num;
3050 	u32 ei_lba = 0;
3051 	bool unmap = false;
3052 	bool ndob = false;
3053 
3054 	if (cmd[1] & 0x8) {	/* UNMAP */
3055 		if (sdebug_lbpws == 0) {
3056 			mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 3);
3057 			return check_condition_result;
3058 		} else
3059 			unmap = true;
3060 	}
3061 	if (cmd[1] & 0x1)  /* NDOB (no data-out buffer, assumes zeroes) */
3062 		ndob = true;
3063 	lba = get_unaligned_be64(cmd + 2);
3064 	num = get_unaligned_be32(cmd + 10);
3065 	if (num > sdebug_write_same_length) {
3066 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 10, -1);
3067 		return check_condition_result;
3068 	}
3069 	return resp_write_same(scp, lba, num, ei_lba, unmap, ndob);
3070 }
3071 
3072 /* Note the mode field is in the same position as the (lower) service action
3073  * field. For the Report supported operation codes command, SPC-4 suggests
3074  * each mode of this command should be reported separately; for future. */
3075 static int resp_write_buffer(struct scsi_cmnd *scp,
3076 			     struct sdebug_dev_info *devip)
3077 {
3078 	u8 *cmd = scp->cmnd;
3079 	struct scsi_device *sdp = scp->device;
3080 	struct sdebug_dev_info *dp;
3081 	u8 mode;
3082 
3083 	mode = cmd[1] & 0x1f;
3084 	switch (mode) {
3085 	case 0x4:	/* download microcode (MC) and activate (ACT) */
3086 		/* set UAs on this device only */
3087 		set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
3088 		set_bit(SDEBUG_UA_MICROCODE_CHANGED, devip->uas_bm);
3089 		break;
3090 	case 0x5:	/* download MC, save and ACT */
3091 		set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET, devip->uas_bm);
3092 		break;
3093 	case 0x6:	/* download MC with offsets and ACT */
3094 		/* set UAs on most devices (LUs) in this target */
3095 		list_for_each_entry(dp,
3096 				    &devip->sdbg_host->dev_info_list,
3097 				    dev_list)
3098 			if (dp->target == sdp->id) {
3099 				set_bit(SDEBUG_UA_BUS_RESET, dp->uas_bm);
3100 				if (devip != dp)
3101 					set_bit(SDEBUG_UA_MICROCODE_CHANGED,
3102 						dp->uas_bm);
3103 			}
3104 		break;
3105 	case 0x7:	/* download MC with offsets, save, and ACT */
3106 		/* set UA on all devices (LUs) in this target */
3107 		list_for_each_entry(dp,
3108 				    &devip->sdbg_host->dev_info_list,
3109 				    dev_list)
3110 			if (dp->target == sdp->id)
3111 				set_bit(SDEBUG_UA_MICROCODE_CHANGED_WO_RESET,
3112 					dp->uas_bm);
3113 		break;
3114 	default:
3115 		/* do nothing for this command for other mode values */
3116 		break;
3117 	}
3118 	return 0;
3119 }
3120 
3121 static int resp_comp_write(struct scsi_cmnd *scp,
3122 			   struct sdebug_dev_info *devip)
3123 {
3124 	u8 *cmd = scp->cmnd;
3125 	u8 *arr;
3126 	u8 *fake_storep_hold;
3127 	u64 lba;
3128 	u32 dnum;
3129 	u32 lb_size = sdebug_sector_size;
3130 	u8 num;
3131 	unsigned long iflags;
3132 	int ret;
3133 	int retval = 0;
3134 
3135 	lba = get_unaligned_be64(cmd + 2);
3136 	num = cmd[13];		/* 1 to a maximum of 255 logical blocks */
3137 	if (0 == num)
3138 		return 0;	/* degenerate case, not an error */
3139 	if (sdebug_dif == T10_PI_TYPE2_PROTECTION &&
3140 	    (cmd[1] & 0xe0)) {
3141 		mk_sense_invalid_opcode(scp);
3142 		return check_condition_result;
3143 	}
3144 	if ((sdebug_dif == T10_PI_TYPE1_PROTECTION ||
3145 	     sdebug_dif == T10_PI_TYPE3_PROTECTION) &&
3146 	    (cmd[1] & 0xe0) == 0)
3147 		sdev_printk(KERN_ERR, scp->device, "Unprotected WR "
3148 			    "to DIF device\n");
3149 
3150 	/* inline check_device_access_params() */
3151 	if (lba + num > sdebug_capacity) {
3152 		mk_sense_buffer(scp, ILLEGAL_REQUEST, LBA_OUT_OF_RANGE, 0);
3153 		return check_condition_result;
3154 	}
3155 	/* transfer length excessive (tie in to block limits VPD page) */
3156 	if (num > sdebug_store_sectors) {
3157 		/* needs work to find which cdb byte 'num' comes from */
3158 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
3159 		return check_condition_result;
3160 	}
3161 	dnum = 2 * num;
3162 	arr = kzalloc(dnum * lb_size, GFP_ATOMIC);
3163 	if (NULL == arr) {
3164 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
3165 				INSUFF_RES_ASCQ);
3166 		return check_condition_result;
3167 	}
3168 
3169 	write_lock_irqsave(&atomic_rw, iflags);
3170 
3171 	/* trick do_device_access() to fetch both compare and write buffers
3172 	 * from data-in into arr. Safe (atomic) since write_lock held. */
3173 	fake_storep_hold = fake_storep;
3174 	fake_storep = arr;
3175 	ret = do_device_access(scp, 0, dnum, true);
3176 	fake_storep = fake_storep_hold;
3177 	if (ret == -1) {
3178 		retval = DID_ERROR << 16;
3179 		goto cleanup;
3180 	} else if (sdebug_verbose && (ret < (dnum * lb_size)))
3181 		sdev_printk(KERN_INFO, scp->device, "%s: compare_write: cdb "
3182 			    "indicated=%u, IO sent=%d bytes\n", my_name,
3183 			    dnum * lb_size, ret);
3184 	if (!comp_write_worker(lba, num, arr)) {
3185 		mk_sense_buffer(scp, MISCOMPARE, MISCOMPARE_VERIFY_ASC, 0);
3186 		retval = check_condition_result;
3187 		goto cleanup;
3188 	}
3189 	if (scsi_debug_lbp())
3190 		map_region(lba, num);
3191 cleanup:
3192 	write_unlock_irqrestore(&atomic_rw, iflags);
3193 	kfree(arr);
3194 	return retval;
3195 }
3196 
3197 struct unmap_block_desc {
3198 	__be64	lba;
3199 	__be32	blocks;
3200 	__be32	__reserved;
3201 };
3202 
3203 static int resp_unmap(struct scsi_cmnd *scp, struct sdebug_dev_info *devip)
3204 {
3205 	unsigned char *buf;
3206 	struct unmap_block_desc *desc;
3207 	unsigned int i, payload_len, descriptors;
3208 	int ret;
3209 	unsigned long iflags;
3210 
3211 
3212 	if (!scsi_debug_lbp())
3213 		return 0;	/* fib and say its done */
3214 	payload_len = get_unaligned_be16(scp->cmnd + 7);
3215 	BUG_ON(scsi_bufflen(scp) != payload_len);
3216 
3217 	descriptors = (payload_len - 8) / 16;
3218 	if (descriptors > sdebug_unmap_max_desc) {
3219 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 7, -1);
3220 		return check_condition_result;
3221 	}
3222 
3223 	buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC);
3224 	if (!buf) {
3225 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
3226 				INSUFF_RES_ASCQ);
3227 		return check_condition_result;
3228 	}
3229 
3230 	scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
3231 
3232 	BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
3233 	BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
3234 
3235 	desc = (void *)&buf[8];
3236 
3237 	write_lock_irqsave(&atomic_rw, iflags);
3238 
3239 	for (i = 0 ; i < descriptors ; i++) {
3240 		unsigned long long lba = get_unaligned_be64(&desc[i].lba);
3241 		unsigned int num = get_unaligned_be32(&desc[i].blocks);
3242 
3243 		ret = check_device_access_params(scp, lba, num);
3244 		if (ret)
3245 			goto out;
3246 
3247 		unmap_region(lba, num);
3248 	}
3249 
3250 	ret = 0;
3251 
3252 out:
3253 	write_unlock_irqrestore(&atomic_rw, iflags);
3254 	kfree(buf);
3255 
3256 	return ret;
3257 }
3258 
3259 #define SDEBUG_GET_LBA_STATUS_LEN 32
3260 
3261 static int resp_get_lba_status(struct scsi_cmnd *scp,
3262 			       struct sdebug_dev_info *devip)
3263 {
3264 	u8 *cmd = scp->cmnd;
3265 	u64 lba;
3266 	u32 alloc_len, mapped, num;
3267 	u8 arr[SDEBUG_GET_LBA_STATUS_LEN];
3268 	int ret;
3269 
3270 	lba = get_unaligned_be64(cmd + 2);
3271 	alloc_len = get_unaligned_be32(cmd + 10);
3272 
3273 	if (alloc_len < 24)
3274 		return 0;
3275 
3276 	ret = check_device_access_params(scp, lba, 1);
3277 	if (ret)
3278 		return ret;
3279 
3280 	if (scsi_debug_lbp())
3281 		mapped = map_state(lba, &num);
3282 	else {
3283 		mapped = 1;
3284 		/* following just in case virtual_gb changed */
3285 		sdebug_capacity = get_sdebug_capacity();
3286 		if (sdebug_capacity - lba <= 0xffffffff)
3287 			num = sdebug_capacity - lba;
3288 		else
3289 			num = 0xffffffff;
3290 	}
3291 
3292 	memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
3293 	put_unaligned_be32(20, arr);		/* Parameter Data Length */
3294 	put_unaligned_be64(lba, arr + 8);	/* LBA */
3295 	put_unaligned_be32(num, arr + 16);	/* Number of blocks */
3296 	arr[20] = !mapped;		/* prov_stat=0: mapped; 1: dealloc */
3297 
3298 	return fill_from_dev_buffer(scp, arr, SDEBUG_GET_LBA_STATUS_LEN);
3299 }
3300 
3301 #define RL_BUCKET_ELEMS 8
3302 
3303 /* Even though each pseudo target has a REPORT LUNS "well known logical unit"
3304  * (W-LUN), the normal Linux scanning logic does not associate it with a
3305  * device (e.g. /dev/sg7). The following magic will make that association:
3306  *   "cd /sys/class/scsi_host/host<n> ; echo '- - 49409' > scan"
3307  * where <n> is a host number. If there are multiple targets in a host then
3308  * the above will associate a W-LUN to each target. To only get a W-LUN
3309  * for target 2, then use "echo '- 2 49409' > scan" .
3310  */
3311 static int resp_report_luns(struct scsi_cmnd *scp,
3312 			    struct sdebug_dev_info *devip)
3313 {
3314 	unsigned char *cmd = scp->cmnd;
3315 	unsigned int alloc_len;
3316 	unsigned char select_report;
3317 	u64 lun;
3318 	struct scsi_lun *lun_p;
3319 	u8 arr[RL_BUCKET_ELEMS * sizeof(struct scsi_lun)];
3320 	unsigned int lun_cnt;	/* normal LUN count (max: 256) */
3321 	unsigned int wlun_cnt;	/* report luns W-LUN count */
3322 	unsigned int tlun_cnt;	/* total LUN count */
3323 	unsigned int rlen;	/* response length (in bytes) */
3324 	int k, j, n, res;
3325 	unsigned int off_rsp = 0;
3326 	const int sz_lun = sizeof(struct scsi_lun);
3327 
3328 	clear_luns_changed_on_target(devip);
3329 
3330 	select_report = cmd[2];
3331 	alloc_len = get_unaligned_be32(cmd + 6);
3332 
3333 	if (alloc_len < 4) {
3334 		pr_err("alloc len too small %d\n", alloc_len);
3335 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 6, -1);
3336 		return check_condition_result;
3337 	}
3338 
3339 	switch (select_report) {
3340 	case 0:		/* all LUNs apart from W-LUNs */
3341 		lun_cnt = sdebug_max_luns;
3342 		wlun_cnt = 0;
3343 		break;
3344 	case 1:		/* only W-LUNs */
3345 		lun_cnt = 0;
3346 		wlun_cnt = 1;
3347 		break;
3348 	case 2:		/* all LUNs */
3349 		lun_cnt = sdebug_max_luns;
3350 		wlun_cnt = 1;
3351 		break;
3352 	case 0x10:	/* only administrative LUs */
3353 	case 0x11:	/* see SPC-5 */
3354 	case 0x12:	/* only subsiduary LUs owned by referenced LU */
3355 	default:
3356 		pr_debug("select report invalid %d\n", select_report);
3357 		mk_sense_invalid_fld(scp, SDEB_IN_CDB, 2, -1);
3358 		return check_condition_result;
3359 	}
3360 
3361 	if (sdebug_no_lun_0 && (lun_cnt > 0))
3362 		--lun_cnt;
3363 
3364 	tlun_cnt = lun_cnt + wlun_cnt;
3365 	rlen = tlun_cnt * sz_lun;	/* excluding 8 byte header */
3366 	scsi_set_resid(scp, scsi_bufflen(scp));
3367 	pr_debug("select_report %d luns = %d wluns = %d no_lun0 %d\n",
3368 		 select_report, lun_cnt, wlun_cnt, sdebug_no_lun_0);
3369 
3370 	/* loops rely on sizeof response header same as sizeof lun (both 8) */
3371 	lun = sdebug_no_lun_0 ? 1 : 0;
3372 	for (k = 0, j = 0, res = 0; true; ++k, j = 0) {
3373 		memset(arr, 0, sizeof(arr));
3374 		lun_p = (struct scsi_lun *)&arr[0];
3375 		if (k == 0) {
3376 			put_unaligned_be32(rlen, &arr[0]);
3377 			++lun_p;
3378 			j = 1;
3379 		}
3380 		for ( ; j < RL_BUCKET_ELEMS; ++j, ++lun_p) {
3381 			if ((k * RL_BUCKET_ELEMS) + j > lun_cnt)
3382 				break;
3383 			int_to_scsilun(lun++, lun_p);
3384 		}
3385 		if (j < RL_BUCKET_ELEMS)
3386 			break;
3387 		n = j * sz_lun;
3388 		res = p_fill_from_dev_buffer(scp, arr, n, off_rsp);
3389 		if (res)
3390 			return res;
3391 		off_rsp += n;
3392 	}
3393 	if (wlun_cnt) {
3394 		int_to_scsilun(SCSI_W_LUN_REPORT_LUNS, lun_p);
3395 		++j;
3396 	}
3397 	if (j > 0)
3398 		res = p_fill_from_dev_buffer(scp, arr, j * sz_lun, off_rsp);
3399 	return res;
3400 }
3401 
3402 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
3403 			    unsigned int num, struct sdebug_dev_info *devip)
3404 {
3405 	int j;
3406 	unsigned char *kaddr, *buf;
3407 	unsigned int offset;
3408 	struct scsi_data_buffer *sdb = scsi_in(scp);
3409 	struct sg_mapping_iter miter;
3410 
3411 	/* better not to use temporary buffer. */
3412 	buf = kzalloc(scsi_bufflen(scp), GFP_ATOMIC);
3413 	if (!buf) {
3414 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
3415 				INSUFF_RES_ASCQ);
3416 		return check_condition_result;
3417 	}
3418 
3419 	scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
3420 
3421 	offset = 0;
3422 	sg_miter_start(&miter, sdb->table.sgl, sdb->table.nents,
3423 			SG_MITER_ATOMIC | SG_MITER_TO_SG);
3424 
3425 	while (sg_miter_next(&miter)) {
3426 		kaddr = miter.addr;
3427 		for (j = 0; j < miter.length; j++)
3428 			*(kaddr + j) ^= *(buf + offset + j);
3429 
3430 		offset += miter.length;
3431 	}
3432 	sg_miter_stop(&miter);
3433 	kfree(buf);
3434 
3435 	return 0;
3436 }
3437 
3438 static int resp_xdwriteread_10(struct scsi_cmnd *scp,
3439 			       struct sdebug_dev_info *devip)
3440 {
3441 	u8 *cmd = scp->cmnd;
3442 	u64 lba;
3443 	u32 num;
3444 	int errsts;
3445 
3446 	if (!scsi_bidi_cmnd(scp)) {
3447 		mk_sense_buffer(scp, ILLEGAL_REQUEST, INSUFF_RES_ASC,
3448 				INSUFF_RES_ASCQ);
3449 		return check_condition_result;
3450 	}
3451 	errsts = resp_read_dt0(scp, devip);
3452 	if (errsts)
3453 		return errsts;
3454 	if (!(cmd[1] & 0x4)) {		/* DISABLE_WRITE is not set */
3455 		errsts = resp_write_dt0(scp, devip);
3456 		if (errsts)
3457 			return errsts;
3458 	}
3459 	lba = get_unaligned_be32(cmd + 2);
3460 	num = get_unaligned_be16(cmd + 7);
3461 	return resp_xdwriteread(scp, lba, num, devip);
3462 }
3463 
3464 static struct sdebug_queue *get_queue(struct scsi_cmnd *cmnd)
3465 {
3466 	struct sdebug_queue *sqp = sdebug_q_arr;
3467 
3468 	if (sdebug_mq_active) {
3469 		u32 tag = blk_mq_unique_tag(cmnd->request);
3470 		u16 hwq = blk_mq_unique_tag_to_hwq(tag);
3471 
3472 		if (unlikely(hwq >= submit_queues)) {
3473 			pr_warn("Unexpected hwq=%d, apply modulo\n", hwq);
3474 			hwq %= submit_queues;
3475 		}
3476 		pr_debug("tag=%u, hwq=%d\n", tag, hwq);
3477 		return sqp + hwq;
3478 	} else
3479 		return sqp;
3480 }
3481 
3482 /* Queued (deferred) command completions converge here. */
3483 static void sdebug_q_cmd_complete(struct sdebug_defer *sd_dp)
3484 {
3485 	int qc_idx;
3486 	int retiring = 0;
3487 	unsigned long iflags;
3488 	struct sdebug_queue *sqp;
3489 	struct sdebug_queued_cmd *sqcp;
3490 	struct scsi_cmnd *scp;
3491 	struct sdebug_dev_info *devip;
3492 
3493 	qc_idx = sd_dp->qc_idx;
3494 	sqp = sdebug_q_arr + sd_dp->sqa_idx;
3495 	if (sdebug_statistics) {
3496 		atomic_inc(&sdebug_completions);
3497 		if (raw_smp_processor_id() != sd_dp->issuing_cpu)
3498 			atomic_inc(&sdebug_miss_cpus);
3499 	}
3500 	if (unlikely((qc_idx < 0) || (qc_idx >= SDEBUG_CANQUEUE))) {
3501 		pr_err("wild qc_idx=%d\n", qc_idx);
3502 		return;
3503 	}
3504 	spin_lock_irqsave(&sqp->qc_lock, iflags);
3505 	sqcp = &sqp->qc_arr[qc_idx];
3506 	scp = sqcp->a_cmnd;
3507 	if (unlikely(scp == NULL)) {
3508 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3509 		pr_err("scp is NULL, sqa_idx=%d, qc_idx=%d\n",
3510 		       sd_dp->sqa_idx, qc_idx);
3511 		return;
3512 	}
3513 	devip = (struct sdebug_dev_info *)scp->device->hostdata;
3514 	if (likely(devip))
3515 		atomic_dec(&devip->num_in_q);
3516 	else
3517 		pr_err("devip=NULL\n");
3518 	if (unlikely(atomic_read(&retired_max_queue) > 0))
3519 		retiring = 1;
3520 
3521 	sqcp->a_cmnd = NULL;
3522 	if (unlikely(!test_and_clear_bit(qc_idx, sqp->in_use_bm))) {
3523 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3524 		pr_err("Unexpected completion\n");
3525 		return;
3526 	}
3527 
3528 	if (unlikely(retiring)) {	/* user has reduced max_queue */
3529 		int k, retval;
3530 
3531 		retval = atomic_read(&retired_max_queue);
3532 		if (qc_idx >= retval) {
3533 			spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3534 			pr_err("index %d too large\n", retval);
3535 			return;
3536 		}
3537 		k = find_last_bit(sqp->in_use_bm, retval);
3538 		if ((k < sdebug_max_queue) || (k == retval))
3539 			atomic_set(&retired_max_queue, 0);
3540 		else
3541 			atomic_set(&retired_max_queue, k + 1);
3542 	}
3543 	spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3544 	scp->scsi_done(scp); /* callback to mid level */
3545 }
3546 
3547 /* When high resolution timer goes off this function is called. */
3548 static enum hrtimer_restart sdebug_q_cmd_hrt_complete(struct hrtimer *timer)
3549 {
3550 	struct sdebug_defer *sd_dp = container_of(timer, struct sdebug_defer,
3551 						  hrt);
3552 	sdebug_q_cmd_complete(sd_dp);
3553 	return HRTIMER_NORESTART;
3554 }
3555 
3556 /* When work queue schedules work, it calls this function. */
3557 static void sdebug_q_cmd_wq_complete(struct work_struct *work)
3558 {
3559 	struct sdebug_defer *sd_dp = container_of(work, struct sdebug_defer,
3560 						  ew.work);
3561 	sdebug_q_cmd_complete(sd_dp);
3562 }
3563 
3564 static bool got_shared_uuid;
3565 static uuid_be shared_uuid;
3566 
3567 static struct sdebug_dev_info *sdebug_device_create(
3568 			struct sdebug_host_info *sdbg_host, gfp_t flags)
3569 {
3570 	struct sdebug_dev_info *devip;
3571 
3572 	devip = kzalloc(sizeof(*devip), flags);
3573 	if (devip) {
3574 		if (sdebug_uuid_ctl == 1)
3575 			uuid_be_gen(&devip->lu_name);
3576 		else if (sdebug_uuid_ctl == 2) {
3577 			if (got_shared_uuid)
3578 				devip->lu_name = shared_uuid;
3579 			else {
3580 				uuid_be_gen(&shared_uuid);
3581 				got_shared_uuid = true;
3582 				devip->lu_name = shared_uuid;
3583 			}
3584 		}
3585 		devip->sdbg_host = sdbg_host;
3586 		list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
3587 	}
3588 	return devip;
3589 }
3590 
3591 static struct sdebug_dev_info *find_build_dev_info(struct scsi_device *sdev)
3592 {
3593 	struct sdebug_host_info *sdbg_host;
3594 	struct sdebug_dev_info *open_devip = NULL;
3595 	struct sdebug_dev_info *devip;
3596 
3597 	sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
3598 	if (!sdbg_host) {
3599 		pr_err("Host info NULL\n");
3600 		return NULL;
3601         }
3602 	list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
3603 		if ((devip->used) && (devip->channel == sdev->channel) &&
3604                     (devip->target == sdev->id) &&
3605                     (devip->lun == sdev->lun))
3606                         return devip;
3607 		else {
3608 			if ((!devip->used) && (!open_devip))
3609 				open_devip = devip;
3610 		}
3611 	}
3612 	if (!open_devip) { /* try and make a new one */
3613 		open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
3614 		if (!open_devip) {
3615 			pr_err("out of memory at line %d\n", __LINE__);
3616 			return NULL;
3617 		}
3618 	}
3619 
3620 	open_devip->channel = sdev->channel;
3621 	open_devip->target = sdev->id;
3622 	open_devip->lun = sdev->lun;
3623 	open_devip->sdbg_host = sdbg_host;
3624 	atomic_set(&open_devip->num_in_q, 0);
3625 	set_bit(SDEBUG_UA_POR, open_devip->uas_bm);
3626 	open_devip->used = true;
3627 	return open_devip;
3628 }
3629 
3630 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
3631 {
3632 	if (sdebug_verbose)
3633 		pr_info("slave_alloc <%u %u %u %llu>\n",
3634 		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
3635 	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
3636 	return 0;
3637 }
3638 
3639 static int scsi_debug_slave_configure(struct scsi_device *sdp)
3640 {
3641 	struct sdebug_dev_info *devip =
3642 			(struct sdebug_dev_info *)sdp->hostdata;
3643 
3644 	if (sdebug_verbose)
3645 		pr_info("slave_configure <%u %u %u %llu>\n",
3646 		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
3647 	if (sdp->host->max_cmd_len != SDEBUG_MAX_CMD_LEN)
3648 		sdp->host->max_cmd_len = SDEBUG_MAX_CMD_LEN;
3649 	if (devip == NULL) {
3650 		devip = find_build_dev_info(sdp);
3651 		if (devip == NULL)
3652 			return 1;  /* no resources, will be marked offline */
3653 	}
3654 	sdp->hostdata = devip;
3655 	blk_queue_max_segment_size(sdp->request_queue, -1U);
3656 	if (sdebug_no_uld)
3657 		sdp->no_uld_attach = 1;
3658 	return 0;
3659 }
3660 
3661 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
3662 {
3663 	struct sdebug_dev_info *devip =
3664 		(struct sdebug_dev_info *)sdp->hostdata;
3665 
3666 	if (sdebug_verbose)
3667 		pr_info("slave_destroy <%u %u %u %llu>\n",
3668 		       sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
3669 	if (devip) {
3670 		/* make this slot available for re-use */
3671 		devip->used = false;
3672 		sdp->hostdata = NULL;
3673 	}
3674 }
3675 
3676 static void stop_qc_helper(struct sdebug_defer *sd_dp)
3677 {
3678 	if (!sd_dp)
3679 		return;
3680 	if ((sdebug_jdelay > 0) || (sdebug_ndelay > 0))
3681 		hrtimer_cancel(&sd_dp->hrt);
3682 	else if (sdebug_jdelay < 0)
3683 		cancel_work_sync(&sd_dp->ew.work);
3684 }
3685 
3686 /* If @cmnd found deletes its timer or work queue and returns true; else
3687    returns false */
3688 static bool stop_queued_cmnd(struct scsi_cmnd *cmnd)
3689 {
3690 	unsigned long iflags;
3691 	int j, k, qmax, r_qmax;
3692 	struct sdebug_queue *sqp;
3693 	struct sdebug_queued_cmd *sqcp;
3694 	struct sdebug_dev_info *devip;
3695 	struct sdebug_defer *sd_dp;
3696 
3697 	for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
3698 		spin_lock_irqsave(&sqp->qc_lock, iflags);
3699 		qmax = sdebug_max_queue;
3700 		r_qmax = atomic_read(&retired_max_queue);
3701 		if (r_qmax > qmax)
3702 			qmax = r_qmax;
3703 		for (k = 0; k < qmax; ++k) {
3704 			if (test_bit(k, sqp->in_use_bm)) {
3705 				sqcp = &sqp->qc_arr[k];
3706 				if (cmnd != sqcp->a_cmnd)
3707 					continue;
3708 				/* found */
3709 				devip = (struct sdebug_dev_info *)
3710 						cmnd->device->hostdata;
3711 				if (devip)
3712 					atomic_dec(&devip->num_in_q);
3713 				sqcp->a_cmnd = NULL;
3714 				sd_dp = sqcp->sd_dp;
3715 				spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3716 				stop_qc_helper(sd_dp);
3717 				clear_bit(k, sqp->in_use_bm);
3718 				return true;
3719 			}
3720 		}
3721 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3722 	}
3723 	return false;
3724 }
3725 
3726 /* Deletes (stops) timers or work queues of all queued commands */
3727 static void stop_all_queued(void)
3728 {
3729 	unsigned long iflags;
3730 	int j, k;
3731 	struct sdebug_queue *sqp;
3732 	struct sdebug_queued_cmd *sqcp;
3733 	struct sdebug_dev_info *devip;
3734 	struct sdebug_defer *sd_dp;
3735 
3736 	for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
3737 		spin_lock_irqsave(&sqp->qc_lock, iflags);
3738 		for (k = 0; k < SDEBUG_CANQUEUE; ++k) {
3739 			if (test_bit(k, sqp->in_use_bm)) {
3740 				sqcp = &sqp->qc_arr[k];
3741 				if (sqcp->a_cmnd == NULL)
3742 					continue;
3743 				devip = (struct sdebug_dev_info *)
3744 					sqcp->a_cmnd->device->hostdata;
3745 				if (devip)
3746 					atomic_dec(&devip->num_in_q);
3747 				sqcp->a_cmnd = NULL;
3748 				sd_dp = sqcp->sd_dp;
3749 				spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3750 				stop_qc_helper(sd_dp);
3751 				clear_bit(k, sqp->in_use_bm);
3752 				spin_lock_irqsave(&sqp->qc_lock, iflags);
3753 			}
3754 		}
3755 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
3756 	}
3757 }
3758 
3759 /* Free queued command memory on heap */
3760 static void free_all_queued(void)
3761 {
3762 	int j, k;
3763 	struct sdebug_queue *sqp;
3764 	struct sdebug_queued_cmd *sqcp;
3765 
3766 	for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
3767 		for (k = 0; k < SDEBUG_CANQUEUE; ++k) {
3768 			sqcp = &sqp->qc_arr[k];
3769 			kfree(sqcp->sd_dp);
3770 			sqcp->sd_dp = NULL;
3771 		}
3772 	}
3773 }
3774 
3775 static int scsi_debug_abort(struct scsi_cmnd *SCpnt)
3776 {
3777 	bool ok;
3778 
3779 	++num_aborts;
3780 	if (SCpnt) {
3781 		ok = stop_queued_cmnd(SCpnt);
3782 		if (SCpnt->device && (SDEBUG_OPT_ALL_NOISE & sdebug_opts))
3783 			sdev_printk(KERN_INFO, SCpnt->device,
3784 				    "%s: command%s found\n", __func__,
3785 				    ok ? "" : " not");
3786 	}
3787 	return SUCCESS;
3788 }
3789 
3790 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
3791 {
3792 	++num_dev_resets;
3793 	if (SCpnt && SCpnt->device) {
3794 		struct scsi_device *sdp = SCpnt->device;
3795 		struct sdebug_dev_info *devip =
3796 				(struct sdebug_dev_info *)sdp->hostdata;
3797 
3798 		if (SDEBUG_OPT_ALL_NOISE & sdebug_opts)
3799 			sdev_printk(KERN_INFO, sdp, "%s\n", __func__);
3800 		if (devip)
3801 			set_bit(SDEBUG_UA_POR, devip->uas_bm);
3802 	}
3803 	return SUCCESS;
3804 }
3805 
3806 static int scsi_debug_target_reset(struct scsi_cmnd *SCpnt)
3807 {
3808 	struct sdebug_host_info *sdbg_host;
3809 	struct sdebug_dev_info *devip;
3810 	struct scsi_device *sdp;
3811 	struct Scsi_Host *hp;
3812 	int k = 0;
3813 
3814 	++num_target_resets;
3815 	if (!SCpnt)
3816 		goto lie;
3817 	sdp = SCpnt->device;
3818 	if (!sdp)
3819 		goto lie;
3820 	if (SDEBUG_OPT_ALL_NOISE & sdebug_opts)
3821 		sdev_printk(KERN_INFO, sdp, "%s\n", __func__);
3822 	hp = sdp->host;
3823 	if (!hp)
3824 		goto lie;
3825 	sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
3826 	if (sdbg_host) {
3827 		list_for_each_entry(devip,
3828 				    &sdbg_host->dev_info_list,
3829 				    dev_list)
3830 			if (devip->target == sdp->id) {
3831 				set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
3832 				++k;
3833 			}
3834 	}
3835 	if (SDEBUG_OPT_RESET_NOISE & sdebug_opts)
3836 		sdev_printk(KERN_INFO, sdp,
3837 			    "%s: %d device(s) found in target\n", __func__, k);
3838 lie:
3839 	return SUCCESS;
3840 }
3841 
3842 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
3843 {
3844 	struct sdebug_host_info *sdbg_host;
3845 	struct sdebug_dev_info *devip;
3846         struct scsi_device * sdp;
3847         struct Scsi_Host * hp;
3848 	int k = 0;
3849 
3850 	++num_bus_resets;
3851 	if (!(SCpnt && SCpnt->device))
3852 		goto lie;
3853 	sdp = SCpnt->device;
3854 	if (SDEBUG_OPT_ALL_NOISE & sdebug_opts)
3855 		sdev_printk(KERN_INFO, sdp, "%s\n", __func__);
3856 	hp = sdp->host;
3857 	if (hp) {
3858 		sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
3859 		if (sdbg_host) {
3860 			list_for_each_entry(devip,
3861                                             &sdbg_host->dev_info_list,
3862 					    dev_list) {
3863 				set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
3864 				++k;
3865 			}
3866 		}
3867 	}
3868 	if (SDEBUG_OPT_RESET_NOISE & sdebug_opts)
3869 		sdev_printk(KERN_INFO, sdp,
3870 			    "%s: %d device(s) found in host\n", __func__, k);
3871 lie:
3872 	return SUCCESS;
3873 }
3874 
3875 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
3876 {
3877 	struct sdebug_host_info * sdbg_host;
3878 	struct sdebug_dev_info *devip;
3879 	int k = 0;
3880 
3881 	++num_host_resets;
3882 	if ((SCpnt->device) && (SDEBUG_OPT_ALL_NOISE & sdebug_opts))
3883 		sdev_printk(KERN_INFO, SCpnt->device, "%s\n", __func__);
3884         spin_lock(&sdebug_host_list_lock);
3885         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
3886 		list_for_each_entry(devip, &sdbg_host->dev_info_list,
3887 				    dev_list) {
3888 			set_bit(SDEBUG_UA_BUS_RESET, devip->uas_bm);
3889 			++k;
3890 		}
3891         }
3892         spin_unlock(&sdebug_host_list_lock);
3893 	stop_all_queued();
3894 	if (SDEBUG_OPT_RESET_NOISE & sdebug_opts)
3895 		sdev_printk(KERN_INFO, SCpnt->device,
3896 			    "%s: %d device(s) found\n", __func__, k);
3897 	return SUCCESS;
3898 }
3899 
3900 static void __init sdebug_build_parts(unsigned char *ramp,
3901 				      unsigned long store_size)
3902 {
3903 	struct partition * pp;
3904 	int starts[SDEBUG_MAX_PARTS + 2];
3905 	int sectors_per_part, num_sectors, k;
3906 	int heads_by_sects, start_sec, end_sec;
3907 
3908 	/* assume partition table already zeroed */
3909 	if ((sdebug_num_parts < 1) || (store_size < 1048576))
3910 		return;
3911 	if (sdebug_num_parts > SDEBUG_MAX_PARTS) {
3912 		sdebug_num_parts = SDEBUG_MAX_PARTS;
3913 		pr_warn("reducing partitions to %d\n", SDEBUG_MAX_PARTS);
3914 	}
3915 	num_sectors = (int)sdebug_store_sectors;
3916 	sectors_per_part = (num_sectors - sdebug_sectors_per)
3917 			   / sdebug_num_parts;
3918 	heads_by_sects = sdebug_heads * sdebug_sectors_per;
3919         starts[0] = sdebug_sectors_per;
3920 	for (k = 1; k < sdebug_num_parts; ++k)
3921 		starts[k] = ((k * sectors_per_part) / heads_by_sects)
3922 			    * heads_by_sects;
3923 	starts[sdebug_num_parts] = num_sectors;
3924 	starts[sdebug_num_parts + 1] = 0;
3925 
3926 	ramp[510] = 0x55;	/* magic partition markings */
3927 	ramp[511] = 0xAA;
3928 	pp = (struct partition *)(ramp + 0x1be);
3929 	for (k = 0; starts[k + 1]; ++k, ++pp) {
3930 		start_sec = starts[k];
3931 		end_sec = starts[k + 1] - 1;
3932 		pp->boot_ind = 0;
3933 
3934 		pp->cyl = start_sec / heads_by_sects;
3935 		pp->head = (start_sec - (pp->cyl * heads_by_sects))
3936 			   / sdebug_sectors_per;
3937 		pp->sector = (start_sec % sdebug_sectors_per) + 1;
3938 
3939 		pp->end_cyl = end_sec / heads_by_sects;
3940 		pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
3941 			       / sdebug_sectors_per;
3942 		pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
3943 
3944 		pp->start_sect = cpu_to_le32(start_sec);
3945 		pp->nr_sects = cpu_to_le32(end_sec - start_sec + 1);
3946 		pp->sys_ind = 0x83;	/* plain Linux partition */
3947 	}
3948 }
3949 
3950 static void block_unblock_all_queues(bool block)
3951 {
3952 	int j;
3953 	struct sdebug_queue *sqp;
3954 
3955 	for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp)
3956 		atomic_set(&sqp->blocked, (int)block);
3957 }
3958 
3959 /* Adjust (by rounding down) the sdebug_cmnd_count so abs(every_nth)-1
3960  * commands will be processed normally before triggers occur.
3961  */
3962 static void tweak_cmnd_count(void)
3963 {
3964 	int count, modulo;
3965 
3966 	modulo = abs(sdebug_every_nth);
3967 	if (modulo < 2)
3968 		return;
3969 	block_unblock_all_queues(true);
3970 	count = atomic_read(&sdebug_cmnd_count);
3971 	atomic_set(&sdebug_cmnd_count, (count / modulo) * modulo);
3972 	block_unblock_all_queues(false);
3973 }
3974 
3975 static void clear_queue_stats(void)
3976 {
3977 	atomic_set(&sdebug_cmnd_count, 0);
3978 	atomic_set(&sdebug_completions, 0);
3979 	atomic_set(&sdebug_miss_cpus, 0);
3980 	atomic_set(&sdebug_a_tsf, 0);
3981 }
3982 
3983 static void setup_inject(struct sdebug_queue *sqp,
3984 			 struct sdebug_queued_cmd *sqcp)
3985 {
3986 	if ((atomic_read(&sdebug_cmnd_count) % abs(sdebug_every_nth)) > 0)
3987 		return;
3988 	sqcp->inj_recovered = !!(SDEBUG_OPT_RECOVERED_ERR & sdebug_opts);
3989 	sqcp->inj_transport = !!(SDEBUG_OPT_TRANSPORT_ERR & sdebug_opts);
3990 	sqcp->inj_dif = !!(SDEBUG_OPT_DIF_ERR & sdebug_opts);
3991 	sqcp->inj_dix = !!(SDEBUG_OPT_DIX_ERR & sdebug_opts);
3992 	sqcp->inj_short = !!(SDEBUG_OPT_SHORT_TRANSFER & sdebug_opts);
3993 }
3994 
3995 /* Complete the processing of the thread that queued a SCSI command to this
3996  * driver. It either completes the command by calling cmnd_done() or
3997  * schedules a hr timer or work queue then returns 0. Returns
3998  * SCSI_MLQUEUE_HOST_BUSY if temporarily out of resources.
3999  */
4000 static int schedule_resp(struct scsi_cmnd *cmnd, struct sdebug_dev_info *devip,
4001 			 int scsi_result, int delta_jiff)
4002 {
4003 	unsigned long iflags;
4004 	int k, num_in_q, qdepth, inject;
4005 	struct sdebug_queue *sqp;
4006 	struct sdebug_queued_cmd *sqcp;
4007 	struct scsi_device *sdp;
4008 	struct sdebug_defer *sd_dp;
4009 
4010 	if (unlikely(devip == NULL)) {
4011 		if (scsi_result == 0)
4012 			scsi_result = DID_NO_CONNECT << 16;
4013 		goto respond_in_thread;
4014 	}
4015 	sdp = cmnd->device;
4016 
4017 	if (unlikely(sdebug_verbose && scsi_result))
4018 		sdev_printk(KERN_INFO, sdp, "%s: non-zero result=0x%x\n",
4019 			    __func__, scsi_result);
4020 	if (delta_jiff == 0)
4021 		goto respond_in_thread;
4022 
4023 	/* schedule the response at a later time if resources permit */
4024 	sqp = get_queue(cmnd);
4025 	spin_lock_irqsave(&sqp->qc_lock, iflags);
4026 	if (unlikely(atomic_read(&sqp->blocked))) {
4027 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
4028 		return SCSI_MLQUEUE_HOST_BUSY;
4029 	}
4030 	num_in_q = atomic_read(&devip->num_in_q);
4031 	qdepth = cmnd->device->queue_depth;
4032 	inject = 0;
4033 	if (unlikely((qdepth > 0) && (num_in_q >= qdepth))) {
4034 		if (scsi_result) {
4035 			spin_unlock_irqrestore(&sqp->qc_lock, iflags);
4036 			goto respond_in_thread;
4037 		} else
4038 			scsi_result = device_qfull_result;
4039 	} else if (unlikely(sdebug_every_nth &&
4040 			    (SDEBUG_OPT_RARE_TSF & sdebug_opts) &&
4041 			    (scsi_result == 0))) {
4042 		if ((num_in_q == (qdepth - 1)) &&
4043 		    (atomic_inc_return(&sdebug_a_tsf) >=
4044 		     abs(sdebug_every_nth))) {
4045 			atomic_set(&sdebug_a_tsf, 0);
4046 			inject = 1;
4047 			scsi_result = device_qfull_result;
4048 		}
4049 	}
4050 
4051 	k = find_first_zero_bit(sqp->in_use_bm, sdebug_max_queue);
4052 	if (unlikely(k >= sdebug_max_queue)) {
4053 		spin_unlock_irqrestore(&sqp->qc_lock, iflags);
4054 		if (scsi_result)
4055 			goto respond_in_thread;
4056 		else if (SDEBUG_OPT_ALL_TSF & sdebug_opts)
4057 			scsi_result = device_qfull_result;
4058 		if (SDEBUG_OPT_Q_NOISE & sdebug_opts)
4059 			sdev_printk(KERN_INFO, sdp,
4060 				    "%s: max_queue=%d exceeded, %s\n",
4061 				    __func__, sdebug_max_queue,
4062 				    (scsi_result ?  "status: TASK SET FULL" :
4063 						    "report: host busy"));
4064 		if (scsi_result)
4065 			goto respond_in_thread;
4066 		else
4067 			return SCSI_MLQUEUE_HOST_BUSY;
4068 	}
4069 	__set_bit(k, sqp->in_use_bm);
4070 	atomic_inc(&devip->num_in_q);
4071 	sqcp = &sqp->qc_arr[k];
4072 	sqcp->a_cmnd = cmnd;
4073 	cmnd->host_scribble = (unsigned char *)sqcp;
4074 	cmnd->result = scsi_result;
4075 	sd_dp = sqcp->sd_dp;
4076 	spin_unlock_irqrestore(&sqp->qc_lock, iflags);
4077 	if (unlikely(sdebug_every_nth && sdebug_any_injecting_opt))
4078 		setup_inject(sqp, sqcp);
4079 	if (delta_jiff > 0 || sdebug_ndelay > 0) {
4080 		ktime_t kt;
4081 
4082 		if (delta_jiff > 0) {
4083 			struct timespec ts;
4084 
4085 			jiffies_to_timespec(delta_jiff, &ts);
4086 			kt = ktime_set(ts.tv_sec, ts.tv_nsec);
4087 		} else
4088 			kt = ktime_set(0, sdebug_ndelay);
4089 		if (NULL == sd_dp) {
4090 			sd_dp = kzalloc(sizeof(*sd_dp), GFP_ATOMIC);
4091 			if (NULL == sd_dp)
4092 				return SCSI_MLQUEUE_HOST_BUSY;
4093 			sqcp->sd_dp = sd_dp;
4094 			hrtimer_init(&sd_dp->hrt, CLOCK_MONOTONIC,
4095 				     HRTIMER_MODE_REL_PINNED);
4096 			sd_dp->hrt.function = sdebug_q_cmd_hrt_complete;
4097 			sd_dp->sqa_idx = sqp - sdebug_q_arr;
4098 			sd_dp->qc_idx = k;
4099 		}
4100 		if (sdebug_statistics)
4101 			sd_dp->issuing_cpu = raw_smp_processor_id();
4102 		hrtimer_start(&sd_dp->hrt, kt, HRTIMER_MODE_REL_PINNED);
4103 	} else {	/* jdelay < 0, use work queue */
4104 		if (NULL == sd_dp) {
4105 			sd_dp = kzalloc(sizeof(*sqcp->sd_dp), GFP_ATOMIC);
4106 			if (NULL == sd_dp)
4107 				return SCSI_MLQUEUE_HOST_BUSY;
4108 			sqcp->sd_dp = sd_dp;
4109 			sd_dp->sqa_idx = sqp - sdebug_q_arr;
4110 			sd_dp->qc_idx = k;
4111 			INIT_WORK(&sd_dp->ew.work, sdebug_q_cmd_wq_complete);
4112 		}
4113 		if (sdebug_statistics)
4114 			sd_dp->issuing_cpu = raw_smp_processor_id();
4115 		schedule_work(&sd_dp->ew.work);
4116 	}
4117 	if (unlikely((SDEBUG_OPT_Q_NOISE & sdebug_opts) &&
4118 		     (scsi_result == device_qfull_result)))
4119 		sdev_printk(KERN_INFO, sdp,
4120 			    "%s: num_in_q=%d +1, %s%s\n", __func__,
4121 			    num_in_q, (inject ? "<inject> " : ""),
4122 			    "status: TASK SET FULL");
4123 	return 0;
4124 
4125 respond_in_thread:	/* call back to mid-layer using invocation thread */
4126 	cmnd->result = scsi_result;
4127 	cmnd->scsi_done(cmnd);
4128 	return 0;
4129 }
4130 
4131 /* Note: The following macros create attribute files in the
4132    /sys/module/scsi_debug/parameters directory. Unfortunately this
4133    driver is unaware of a change and cannot trigger auxiliary actions
4134    as it can when the corresponding attribute in the
4135    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
4136  */
4137 module_param_named(add_host, sdebug_add_host, int, S_IRUGO | S_IWUSR);
4138 module_param_named(ato, sdebug_ato, int, S_IRUGO);
4139 module_param_named(clustering, sdebug_clustering, bool, S_IRUGO | S_IWUSR);
4140 module_param_named(delay, sdebug_jdelay, int, S_IRUGO | S_IWUSR);
4141 module_param_named(dev_size_mb, sdebug_dev_size_mb, int, S_IRUGO);
4142 module_param_named(dif, sdebug_dif, int, S_IRUGO);
4143 module_param_named(dix, sdebug_dix, int, S_IRUGO);
4144 module_param_named(dsense, sdebug_dsense, int, S_IRUGO | S_IWUSR);
4145 module_param_named(every_nth, sdebug_every_nth, int, S_IRUGO | S_IWUSR);
4146 module_param_named(fake_rw, sdebug_fake_rw, int, S_IRUGO | S_IWUSR);
4147 module_param_named(guard, sdebug_guard, uint, S_IRUGO);
4148 module_param_named(host_lock, sdebug_host_lock, bool, S_IRUGO | S_IWUSR);
4149 module_param_named(lbpu, sdebug_lbpu, int, S_IRUGO);
4150 module_param_named(lbpws, sdebug_lbpws, int, S_IRUGO);
4151 module_param_named(lbpws10, sdebug_lbpws10, int, S_IRUGO);
4152 module_param_named(lbprz, sdebug_lbprz, int, S_IRUGO);
4153 module_param_named(lowest_aligned, sdebug_lowest_aligned, int, S_IRUGO);
4154 module_param_named(max_luns, sdebug_max_luns, int, S_IRUGO | S_IWUSR);
4155 module_param_named(max_queue, sdebug_max_queue, int, S_IRUGO | S_IWUSR);
4156 module_param_named(ndelay, sdebug_ndelay, int, S_IRUGO | S_IWUSR);
4157 module_param_named(no_lun_0, sdebug_no_lun_0, int, S_IRUGO | S_IWUSR);
4158 module_param_named(no_uld, sdebug_no_uld, int, S_IRUGO);
4159 module_param_named(num_parts, sdebug_num_parts, int, S_IRUGO);
4160 module_param_named(num_tgts, sdebug_num_tgts, int, S_IRUGO | S_IWUSR);
4161 module_param_named(opt_blks, sdebug_opt_blks, int, S_IRUGO);
4162 module_param_named(opts, sdebug_opts, int, S_IRUGO | S_IWUSR);
4163 module_param_named(physblk_exp, sdebug_physblk_exp, int, S_IRUGO);
4164 module_param_named(ptype, sdebug_ptype, int, S_IRUGO | S_IWUSR);
4165 module_param_named(removable, sdebug_removable, bool, S_IRUGO | S_IWUSR);
4166 module_param_named(scsi_level, sdebug_scsi_level, int, S_IRUGO);
4167 module_param_named(sector_size, sdebug_sector_size, int, S_IRUGO);
4168 module_param_named(statistics, sdebug_statistics, bool, S_IRUGO | S_IWUSR);
4169 module_param_named(strict, sdebug_strict, bool, S_IRUGO | S_IWUSR);
4170 module_param_named(submit_queues, submit_queues, int, S_IRUGO);
4171 module_param_named(unmap_alignment, sdebug_unmap_alignment, int, S_IRUGO);
4172 module_param_named(unmap_granularity, sdebug_unmap_granularity, int, S_IRUGO);
4173 module_param_named(unmap_max_blocks, sdebug_unmap_max_blocks, int, S_IRUGO);
4174 module_param_named(unmap_max_desc, sdebug_unmap_max_desc, int, S_IRUGO);
4175 module_param_named(virtual_gb, sdebug_virtual_gb, int, S_IRUGO | S_IWUSR);
4176 module_param_named(uuid_ctl, sdebug_uuid_ctl, int, S_IRUGO);
4177 module_param_named(vpd_use_hostno, sdebug_vpd_use_hostno, int,
4178 		   S_IRUGO | S_IWUSR);
4179 module_param_named(write_same_length, sdebug_write_same_length, int,
4180 		   S_IRUGO | S_IWUSR);
4181 
4182 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
4183 MODULE_DESCRIPTION("SCSI debug adapter driver");
4184 MODULE_LICENSE("GPL");
4185 MODULE_VERSION(SDEBUG_VERSION);
4186 
4187 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
4188 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
4189 MODULE_PARM_DESC(clustering, "when set enables larger transfers (def=0)");
4190 MODULE_PARM_DESC(delay, "response delay (def=1 jiffy); 0:imm, -1,-2:tiny");
4191 MODULE_PARM_DESC(dev_size_mb, "size in MiB of ram shared by devs(def=8)");
4192 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
4193 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
4194 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
4195 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
4196 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
4197 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
4198 MODULE_PARM_DESC(host_lock, "host_lock is ignored (def=0)");
4199 MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
4200 MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
4201 MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
4202 MODULE_PARM_DESC(lbprz,
4203 	"on read unmapped LBs return 0 when 1 (def), return 0xff when 2");
4204 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
4205 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
4206 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to max(def))");
4207 MODULE_PARM_DESC(ndelay, "response delay in nanoseconds (def=0 -> ignore)");
4208 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
4209 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
4210 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
4211 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
4212 MODULE_PARM_DESC(opt_blks, "optimal transfer length in blocks (def=1024)");
4213 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
4214 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
4215 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
4216 MODULE_PARM_DESC(removable, "claim to have removable media (def=0)");
4217 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=7[SPC-5])");
4218 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
4219 MODULE_PARM_DESC(statistics, "collect statistics on commands, queues (def=0)");
4220 MODULE_PARM_DESC(strict, "stricter checks: reserved field in cdb (def=0)");
4221 MODULE_PARM_DESC(submit_queues, "support for block multi-queue (def=1)");
4222 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
4223 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
4224 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
4225 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
4226 MODULE_PARM_DESC(uuid_ctl,
4227 		 "1->use uuid for lu name, 0->don't, 2->all use same (def=0)");
4228 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte (GiB) size (def=0 -> use dev_size_mb)");
4229 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
4230 MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
4231 
4232 #define SDEBUG_INFO_LEN 256
4233 static char sdebug_info[SDEBUG_INFO_LEN];
4234 
4235 static const char * scsi_debug_info(struct Scsi_Host * shp)
4236 {
4237 	int k;
4238 
4239 	k = scnprintf(sdebug_info, SDEBUG_INFO_LEN, "%s: version %s [%s]\n",
4240 		      my_name, SDEBUG_VERSION, sdebug_version_date);
4241 	if (k >= (SDEBUG_INFO_LEN - 1))
4242 		return sdebug_info;
4243 	scnprintf(sdebug_info + k, SDEBUG_INFO_LEN - k,
4244 		  "  dev_size_mb=%d, opts=0x%x, submit_queues=%d, %s=%d",
4245 		  sdebug_dev_size_mb, sdebug_opts, submit_queues,
4246 		  "statistics", (int)sdebug_statistics);
4247 	return sdebug_info;
4248 }
4249 
4250 /* 'echo <val> > /proc/scsi/scsi_debug/<host_id>' writes to opts */
4251 static int scsi_debug_write_info(struct Scsi_Host *host, char *buffer,
4252 				 int length)
4253 {
4254 	char arr[16];
4255 	int opts;
4256 	int minLen = length > 15 ? 15 : length;
4257 
4258 	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
4259 		return -EACCES;
4260 	memcpy(arr, buffer, minLen);
4261 	arr[minLen] = '\0';
4262 	if (1 != sscanf(arr, "%d", &opts))
4263 		return -EINVAL;
4264 	sdebug_opts = opts;
4265 	sdebug_verbose = !!(SDEBUG_OPT_NOISE & opts);
4266 	sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & opts);
4267 	if (sdebug_every_nth != 0)
4268 		tweak_cmnd_count();
4269 	return length;
4270 }
4271 
4272 /* Output seen with 'cat /proc/scsi/scsi_debug/<host_id>'. It will be the
4273  * same for each scsi_debug host (if more than one). Some of the counters
4274  * output are not atomics so might be inaccurate in a busy system. */
4275 static int scsi_debug_show_info(struct seq_file *m, struct Scsi_Host *host)
4276 {
4277 	int f, j, l;
4278 	struct sdebug_queue *sqp;
4279 
4280 	seq_printf(m, "scsi_debug adapter driver, version %s [%s]\n",
4281 		   SDEBUG_VERSION, sdebug_version_date);
4282 	seq_printf(m, "num_tgts=%d, %ssize=%d MB, opts=0x%x, every_nth=%d\n",
4283 		   sdebug_num_tgts, "shared (ram) ", sdebug_dev_size_mb,
4284 		   sdebug_opts, sdebug_every_nth);
4285 	seq_printf(m, "delay=%d, ndelay=%d, max_luns=%d, sector_size=%d %s\n",
4286 		   sdebug_jdelay, sdebug_ndelay, sdebug_max_luns,
4287 		   sdebug_sector_size, "bytes");
4288 	seq_printf(m, "cylinders=%d, heads=%d, sectors=%d, command aborts=%d\n",
4289 		   sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
4290 		   num_aborts);
4291 	seq_printf(m, "RESETs: device=%d, target=%d, bus=%d, host=%d\n",
4292 		   num_dev_resets, num_target_resets, num_bus_resets,
4293 		   num_host_resets);
4294 	seq_printf(m, "dix_reads=%d, dix_writes=%d, dif_errors=%d\n",
4295 		   dix_reads, dix_writes, dif_errors);
4296 	seq_printf(m, "usec_in_jiffy=%lu, %s=%d, mq_active=%d\n",
4297 		   TICK_NSEC / 1000, "statistics", sdebug_statistics,
4298 		   sdebug_mq_active);
4299 	seq_printf(m, "cmnd_count=%d, completions=%d, %s=%d, a_tsf=%d\n",
4300 		   atomic_read(&sdebug_cmnd_count),
4301 		   atomic_read(&sdebug_completions),
4302 		   "miss_cpus", atomic_read(&sdebug_miss_cpus),
4303 		   atomic_read(&sdebug_a_tsf));
4304 
4305 	seq_printf(m, "submit_queues=%d\n", submit_queues);
4306 	for (j = 0, sqp = sdebug_q_arr; j < submit_queues; ++j, ++sqp) {
4307 		seq_printf(m, "  queue %d:\n", j);
4308 		f = find_first_bit(sqp->in_use_bm, sdebug_max_queue);
4309 		if (f != sdebug_max_queue) {
4310 			l = find_last_bit(sqp->in_use_bm, sdebug_max_queue);
4311 			seq_printf(m, "    in_use_bm BUSY: %s: %d,%d\n",
4312 				   "first,last bits", f, l);
4313 		}
4314 	}
4315 	return 0;
4316 }
4317 
4318 static ssize_t delay_show(struct device_driver *ddp, char *buf)
4319 {
4320 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_jdelay);
4321 }
4322 /* Returns -EBUSY if jdelay is being changed and commands are queued. The unit
4323  * of delay is jiffies.
4324  */
4325 static ssize_t delay_store(struct device_driver *ddp, const char *buf,
4326 			   size_t count)
4327 {
4328 	int jdelay, res;
4329 
4330 	if (count > 0 && sscanf(buf, "%d", &jdelay) == 1) {
4331 		res = count;
4332 		if (sdebug_jdelay != jdelay) {
4333 			int j, k;
4334 			struct sdebug_queue *sqp;
4335 
4336 			block_unblock_all_queues(true);
4337 			for (j = 0, sqp = sdebug_q_arr; j < submit_queues;
4338 			     ++j, ++sqp) {
4339 				k = find_first_bit(sqp->in_use_bm,
4340 						   sdebug_max_queue);
4341 				if (k != sdebug_max_queue) {
4342 					res = -EBUSY;   /* queued commands */
4343 					break;
4344 				}
4345 			}
4346 			if (res > 0) {
4347 				/* make sure sdebug_defer instances get
4348 				 * re-allocated for new delay variant */
4349 				free_all_queued();
4350 				sdebug_jdelay = jdelay;
4351 				sdebug_ndelay = 0;
4352 			}
4353 			block_unblock_all_queues(false);
4354 		}
4355 		return res;
4356 	}
4357 	return -EINVAL;
4358 }
4359 static DRIVER_ATTR_RW(delay);
4360 
4361 static ssize_t ndelay_show(struct device_driver *ddp, char *buf)
4362 {
4363 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ndelay);
4364 }
4365 /* Returns -EBUSY if ndelay is being changed and commands are queued */
4366 /* If > 0 and accepted then sdebug_jdelay is set to JDELAY_OVERRIDDEN */
4367 static ssize_t ndelay_store(struct device_driver *ddp, const char *buf,
4368 			    size_t count)
4369 {
4370 	int ndelay, res;
4371 
4372 	if ((count > 0) && (1 == sscanf(buf, "%d", &ndelay)) &&
4373 	    (ndelay >= 0) && (ndelay < (1000 * 1000 * 1000))) {
4374 		res = count;
4375 		if (sdebug_ndelay != ndelay) {
4376 			int j, k;
4377 			struct sdebug_queue *sqp;
4378 
4379 			block_unblock_all_queues(true);
4380 			for (j = 0, sqp = sdebug_q_arr; j < submit_queues;
4381 			     ++j, ++sqp) {
4382 				k = find_first_bit(sqp->in_use_bm,
4383 						   sdebug_max_queue);
4384 				if (k != sdebug_max_queue) {
4385 					res = -EBUSY;   /* queued commands */
4386 					break;
4387 				}
4388 			}
4389 			if (res > 0) {
4390 				/* make sure sdebug_defer instances get
4391 				 * re-allocated for new delay variant */
4392 				free_all_queued();
4393 				sdebug_ndelay = ndelay;
4394 				sdebug_jdelay = ndelay  ? JDELAY_OVERRIDDEN
4395 							: DEF_JDELAY;
4396 			}
4397 			block_unblock_all_queues(false);
4398 		}
4399 		return res;
4400 	}
4401 	return -EINVAL;
4402 }
4403 static DRIVER_ATTR_RW(ndelay);
4404 
4405 static ssize_t opts_show(struct device_driver *ddp, char *buf)
4406 {
4407 	return scnprintf(buf, PAGE_SIZE, "0x%x\n", sdebug_opts);
4408 }
4409 
4410 static ssize_t opts_store(struct device_driver *ddp, const char *buf,
4411 			  size_t count)
4412 {
4413         int opts;
4414 	char work[20];
4415 
4416         if (1 == sscanf(buf, "%10s", work)) {
4417 		if (0 == strncasecmp(work,"0x", 2)) {
4418 			if (1 == sscanf(&work[2], "%x", &opts))
4419 				goto opts_done;
4420 		} else {
4421 			if (1 == sscanf(work, "%d", &opts))
4422 				goto opts_done;
4423 		}
4424 	}
4425 	return -EINVAL;
4426 opts_done:
4427 	sdebug_opts = opts;
4428 	sdebug_verbose = !!(SDEBUG_OPT_NOISE & opts);
4429 	sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & opts);
4430 	tweak_cmnd_count();
4431 	return count;
4432 }
4433 static DRIVER_ATTR_RW(opts);
4434 
4435 static ssize_t ptype_show(struct device_driver *ddp, char *buf)
4436 {
4437 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ptype);
4438 }
4439 static ssize_t ptype_store(struct device_driver *ddp, const char *buf,
4440 			   size_t count)
4441 {
4442         int n;
4443 
4444 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4445 		sdebug_ptype = n;
4446 		return count;
4447 	}
4448 	return -EINVAL;
4449 }
4450 static DRIVER_ATTR_RW(ptype);
4451 
4452 static ssize_t dsense_show(struct device_driver *ddp, char *buf)
4453 {
4454 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dsense);
4455 }
4456 static ssize_t dsense_store(struct device_driver *ddp, const char *buf,
4457 			    size_t count)
4458 {
4459         int n;
4460 
4461 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4462 		sdebug_dsense = n;
4463 		return count;
4464 	}
4465 	return -EINVAL;
4466 }
4467 static DRIVER_ATTR_RW(dsense);
4468 
4469 static ssize_t fake_rw_show(struct device_driver *ddp, char *buf)
4470 {
4471 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_fake_rw);
4472 }
4473 static ssize_t fake_rw_store(struct device_driver *ddp, const char *buf,
4474 			     size_t count)
4475 {
4476         int n;
4477 
4478 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4479 		n = (n > 0);
4480 		sdebug_fake_rw = (sdebug_fake_rw > 0);
4481 		if (sdebug_fake_rw != n) {
4482 			if ((0 == n) && (NULL == fake_storep)) {
4483 				unsigned long sz =
4484 					(unsigned long)sdebug_dev_size_mb *
4485 					1048576;
4486 
4487 				fake_storep = vmalloc(sz);
4488 				if (NULL == fake_storep) {
4489 					pr_err("out of memory, 9\n");
4490 					return -ENOMEM;
4491 				}
4492 				memset(fake_storep, 0, sz);
4493 			}
4494 			sdebug_fake_rw = n;
4495 		}
4496 		return count;
4497 	}
4498 	return -EINVAL;
4499 }
4500 static DRIVER_ATTR_RW(fake_rw);
4501 
4502 static ssize_t no_lun_0_show(struct device_driver *ddp, char *buf)
4503 {
4504 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_no_lun_0);
4505 }
4506 static ssize_t no_lun_0_store(struct device_driver *ddp, const char *buf,
4507 			      size_t count)
4508 {
4509         int n;
4510 
4511 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4512 		sdebug_no_lun_0 = n;
4513 		return count;
4514 	}
4515 	return -EINVAL;
4516 }
4517 static DRIVER_ATTR_RW(no_lun_0);
4518 
4519 static ssize_t num_tgts_show(struct device_driver *ddp, char *buf)
4520 {
4521 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_num_tgts);
4522 }
4523 static ssize_t num_tgts_store(struct device_driver *ddp, const char *buf,
4524 			      size_t count)
4525 {
4526         int n;
4527 
4528 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4529 		sdebug_num_tgts = n;
4530 		sdebug_max_tgts_luns();
4531 		return count;
4532 	}
4533 	return -EINVAL;
4534 }
4535 static DRIVER_ATTR_RW(num_tgts);
4536 
4537 static ssize_t dev_size_mb_show(struct device_driver *ddp, char *buf)
4538 {
4539 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dev_size_mb);
4540 }
4541 static DRIVER_ATTR_RO(dev_size_mb);
4542 
4543 static ssize_t num_parts_show(struct device_driver *ddp, char *buf)
4544 {
4545 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_num_parts);
4546 }
4547 static DRIVER_ATTR_RO(num_parts);
4548 
4549 static ssize_t every_nth_show(struct device_driver *ddp, char *buf)
4550 {
4551 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_every_nth);
4552 }
4553 static ssize_t every_nth_store(struct device_driver *ddp, const char *buf,
4554 			       size_t count)
4555 {
4556         int nth;
4557 
4558 	if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
4559 		sdebug_every_nth = nth;
4560 		if (nth && !sdebug_statistics) {
4561 			pr_info("every_nth needs statistics=1, set it\n");
4562 			sdebug_statistics = true;
4563 		}
4564 		tweak_cmnd_count();
4565 		return count;
4566 	}
4567 	return -EINVAL;
4568 }
4569 static DRIVER_ATTR_RW(every_nth);
4570 
4571 static ssize_t max_luns_show(struct device_driver *ddp, char *buf)
4572 {
4573 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_max_luns);
4574 }
4575 static ssize_t max_luns_store(struct device_driver *ddp, const char *buf,
4576 			      size_t count)
4577 {
4578         int n;
4579 	bool changed;
4580 
4581 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4582 		if (n > 256) {
4583 			pr_warn("max_luns can be no more than 256\n");
4584 			return -EINVAL;
4585 		}
4586 		changed = (sdebug_max_luns != n);
4587 		sdebug_max_luns = n;
4588 		sdebug_max_tgts_luns();
4589 		if (changed && (sdebug_scsi_level >= 5)) {	/* >= SPC-3 */
4590 			struct sdebug_host_info *sdhp;
4591 			struct sdebug_dev_info *dp;
4592 
4593 			spin_lock(&sdebug_host_list_lock);
4594 			list_for_each_entry(sdhp, &sdebug_host_list,
4595 					    host_list) {
4596 				list_for_each_entry(dp, &sdhp->dev_info_list,
4597 						    dev_list) {
4598 					set_bit(SDEBUG_UA_LUNS_CHANGED,
4599 						dp->uas_bm);
4600 				}
4601 			}
4602 			spin_unlock(&sdebug_host_list_lock);
4603 		}
4604 		return count;
4605 	}
4606 	return -EINVAL;
4607 }
4608 static DRIVER_ATTR_RW(max_luns);
4609 
4610 static ssize_t max_queue_show(struct device_driver *ddp, char *buf)
4611 {
4612 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_max_queue);
4613 }
4614 /* N.B. max_queue can be changed while there are queued commands. In flight
4615  * commands beyond the new max_queue will be completed. */
4616 static ssize_t max_queue_store(struct device_driver *ddp, const char *buf,
4617 			       size_t count)
4618 {
4619 	int j, n, k, a;
4620 	struct sdebug_queue *sqp;
4621 
4622 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
4623 	    (n <= SDEBUG_CANQUEUE)) {
4624 		block_unblock_all_queues(true);
4625 		k = 0;
4626 		for (j = 0, sqp = sdebug_q_arr; j < submit_queues;
4627 		     ++j, ++sqp) {
4628 			a = find_last_bit(sqp->in_use_bm, SDEBUG_CANQUEUE);
4629 			if (a > k)
4630 				k = a;
4631 		}
4632 		sdebug_max_queue = n;
4633 		if (k == SDEBUG_CANQUEUE)
4634 			atomic_set(&retired_max_queue, 0);
4635 		else if (k >= n)
4636 			atomic_set(&retired_max_queue, k + 1);
4637 		else
4638 			atomic_set(&retired_max_queue, 0);
4639 		block_unblock_all_queues(false);
4640 		return count;
4641 	}
4642 	return -EINVAL;
4643 }
4644 static DRIVER_ATTR_RW(max_queue);
4645 
4646 static ssize_t no_uld_show(struct device_driver *ddp, char *buf)
4647 {
4648 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_no_uld);
4649 }
4650 static DRIVER_ATTR_RO(no_uld);
4651 
4652 static ssize_t scsi_level_show(struct device_driver *ddp, char *buf)
4653 {
4654 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_scsi_level);
4655 }
4656 static DRIVER_ATTR_RO(scsi_level);
4657 
4658 static ssize_t virtual_gb_show(struct device_driver *ddp, char *buf)
4659 {
4660 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_virtual_gb);
4661 }
4662 static ssize_t virtual_gb_store(struct device_driver *ddp, const char *buf,
4663 				size_t count)
4664 {
4665         int n;
4666 	bool changed;
4667 
4668 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4669 		changed = (sdebug_virtual_gb != n);
4670 		sdebug_virtual_gb = n;
4671 		sdebug_capacity = get_sdebug_capacity();
4672 		if (changed) {
4673 			struct sdebug_host_info *sdhp;
4674 			struct sdebug_dev_info *dp;
4675 
4676 			spin_lock(&sdebug_host_list_lock);
4677 			list_for_each_entry(sdhp, &sdebug_host_list,
4678 					    host_list) {
4679 				list_for_each_entry(dp, &sdhp->dev_info_list,
4680 						    dev_list) {
4681 					set_bit(SDEBUG_UA_CAPACITY_CHANGED,
4682 						dp->uas_bm);
4683 				}
4684 			}
4685 			spin_unlock(&sdebug_host_list_lock);
4686 		}
4687 		return count;
4688 	}
4689 	return -EINVAL;
4690 }
4691 static DRIVER_ATTR_RW(virtual_gb);
4692 
4693 static ssize_t add_host_show(struct device_driver *ddp, char *buf)
4694 {
4695 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_add_host);
4696 }
4697 
4698 static int sdebug_add_adapter(void);
4699 static void sdebug_remove_adapter(void);
4700 
4701 static ssize_t add_host_store(struct device_driver *ddp, const char *buf,
4702 			      size_t count)
4703 {
4704 	int delta_hosts;
4705 
4706 	if (sscanf(buf, "%d", &delta_hosts) != 1)
4707 		return -EINVAL;
4708 	if (delta_hosts > 0) {
4709 		do {
4710 			sdebug_add_adapter();
4711 		} while (--delta_hosts);
4712 	} else if (delta_hosts < 0) {
4713 		do {
4714 			sdebug_remove_adapter();
4715 		} while (++delta_hosts);
4716 	}
4717 	return count;
4718 }
4719 static DRIVER_ATTR_RW(add_host);
4720 
4721 static ssize_t vpd_use_hostno_show(struct device_driver *ddp, char *buf)
4722 {
4723 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_vpd_use_hostno);
4724 }
4725 static ssize_t vpd_use_hostno_store(struct device_driver *ddp, const char *buf,
4726 				    size_t count)
4727 {
4728 	int n;
4729 
4730 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4731 		sdebug_vpd_use_hostno = n;
4732 		return count;
4733 	}
4734 	return -EINVAL;
4735 }
4736 static DRIVER_ATTR_RW(vpd_use_hostno);
4737 
4738 static ssize_t statistics_show(struct device_driver *ddp, char *buf)
4739 {
4740 	return scnprintf(buf, PAGE_SIZE, "%d\n", (int)sdebug_statistics);
4741 }
4742 static ssize_t statistics_store(struct device_driver *ddp, const char *buf,
4743 				size_t count)
4744 {
4745 	int n;
4746 
4747 	if ((count > 0) && (sscanf(buf, "%d", &n) == 1) && (n >= 0)) {
4748 		if (n > 0)
4749 			sdebug_statistics = true;
4750 		else {
4751 			clear_queue_stats();
4752 			sdebug_statistics = false;
4753 		}
4754 		return count;
4755 	}
4756 	return -EINVAL;
4757 }
4758 static DRIVER_ATTR_RW(statistics);
4759 
4760 static ssize_t sector_size_show(struct device_driver *ddp, char *buf)
4761 {
4762 	return scnprintf(buf, PAGE_SIZE, "%u\n", sdebug_sector_size);
4763 }
4764 static DRIVER_ATTR_RO(sector_size);
4765 
4766 static ssize_t submit_queues_show(struct device_driver *ddp, char *buf)
4767 {
4768 	return scnprintf(buf, PAGE_SIZE, "%d\n", submit_queues);
4769 }
4770 static DRIVER_ATTR_RO(submit_queues);
4771 
4772 static ssize_t dix_show(struct device_driver *ddp, char *buf)
4773 {
4774 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dix);
4775 }
4776 static DRIVER_ATTR_RO(dix);
4777 
4778 static ssize_t dif_show(struct device_driver *ddp, char *buf)
4779 {
4780 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_dif);
4781 }
4782 static DRIVER_ATTR_RO(dif);
4783 
4784 static ssize_t guard_show(struct device_driver *ddp, char *buf)
4785 {
4786 	return scnprintf(buf, PAGE_SIZE, "%u\n", sdebug_guard);
4787 }
4788 static DRIVER_ATTR_RO(guard);
4789 
4790 static ssize_t ato_show(struct device_driver *ddp, char *buf)
4791 {
4792 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_ato);
4793 }
4794 static DRIVER_ATTR_RO(ato);
4795 
4796 static ssize_t map_show(struct device_driver *ddp, char *buf)
4797 {
4798 	ssize_t count;
4799 
4800 	if (!scsi_debug_lbp())
4801 		return scnprintf(buf, PAGE_SIZE, "0-%u\n",
4802 				 sdebug_store_sectors);
4803 
4804 	count = scnprintf(buf, PAGE_SIZE - 1, "%*pbl",
4805 			  (int)map_size, map_storep);
4806 	buf[count++] = '\n';
4807 	buf[count] = '\0';
4808 
4809 	return count;
4810 }
4811 static DRIVER_ATTR_RO(map);
4812 
4813 static ssize_t removable_show(struct device_driver *ddp, char *buf)
4814 {
4815 	return scnprintf(buf, PAGE_SIZE, "%d\n", sdebug_removable ? 1 : 0);
4816 }
4817 static ssize_t removable_store(struct device_driver *ddp, const char *buf,
4818 			       size_t count)
4819 {
4820 	int n;
4821 
4822 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4823 		sdebug_removable = (n > 0);
4824 		return count;
4825 	}
4826 	return -EINVAL;
4827 }
4828 static DRIVER_ATTR_RW(removable);
4829 
4830 static ssize_t host_lock_show(struct device_driver *ddp, char *buf)
4831 {
4832 	return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_host_lock);
4833 }
4834 /* N.B. sdebug_host_lock does nothing, kept for backward compatibility */
4835 static ssize_t host_lock_store(struct device_driver *ddp, const char *buf,
4836 			       size_t count)
4837 {
4838 	int n;
4839 
4840 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4841 		sdebug_host_lock = (n > 0);
4842 		return count;
4843 	}
4844 	return -EINVAL;
4845 }
4846 static DRIVER_ATTR_RW(host_lock);
4847 
4848 static ssize_t strict_show(struct device_driver *ddp, char *buf)
4849 {
4850 	return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_strict);
4851 }
4852 static ssize_t strict_store(struct device_driver *ddp, const char *buf,
4853 			    size_t count)
4854 {
4855 	int n;
4856 
4857 	if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
4858 		sdebug_strict = (n > 0);
4859 		return count;
4860 	}
4861 	return -EINVAL;
4862 }
4863 static DRIVER_ATTR_RW(strict);
4864 
4865 static ssize_t uuid_ctl_show(struct device_driver *ddp, char *buf)
4866 {
4867 	return scnprintf(buf, PAGE_SIZE, "%d\n", !!sdebug_uuid_ctl);
4868 }
4869 static DRIVER_ATTR_RO(uuid_ctl);
4870 
4871 
4872 /* Note: The following array creates attribute files in the
4873    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
4874    files (over those found in the /sys/module/scsi_debug/parameters
4875    directory) is that auxiliary actions can be triggered when an attribute
4876    is changed. For example see: sdebug_add_host_store() above.
4877  */
4878 
4879 static struct attribute *sdebug_drv_attrs[] = {
4880 	&driver_attr_delay.attr,
4881 	&driver_attr_opts.attr,
4882 	&driver_attr_ptype.attr,
4883 	&driver_attr_dsense.attr,
4884 	&driver_attr_fake_rw.attr,
4885 	&driver_attr_no_lun_0.attr,
4886 	&driver_attr_num_tgts.attr,
4887 	&driver_attr_dev_size_mb.attr,
4888 	&driver_attr_num_parts.attr,
4889 	&driver_attr_every_nth.attr,
4890 	&driver_attr_max_luns.attr,
4891 	&driver_attr_max_queue.attr,
4892 	&driver_attr_no_uld.attr,
4893 	&driver_attr_scsi_level.attr,
4894 	&driver_attr_virtual_gb.attr,
4895 	&driver_attr_add_host.attr,
4896 	&driver_attr_vpd_use_hostno.attr,
4897 	&driver_attr_sector_size.attr,
4898 	&driver_attr_statistics.attr,
4899 	&driver_attr_submit_queues.attr,
4900 	&driver_attr_dix.attr,
4901 	&driver_attr_dif.attr,
4902 	&driver_attr_guard.attr,
4903 	&driver_attr_ato.attr,
4904 	&driver_attr_map.attr,
4905 	&driver_attr_removable.attr,
4906 	&driver_attr_host_lock.attr,
4907 	&driver_attr_ndelay.attr,
4908 	&driver_attr_strict.attr,
4909 	&driver_attr_uuid_ctl.attr,
4910 	NULL,
4911 };
4912 ATTRIBUTE_GROUPS(sdebug_drv);
4913 
4914 static struct device *pseudo_primary;
4915 
4916 static int __init scsi_debug_init(void)
4917 {
4918 	unsigned long sz;
4919 	int host_to_add;
4920 	int k;
4921 	int ret;
4922 
4923 	atomic_set(&retired_max_queue, 0);
4924 
4925 	if (sdebug_ndelay >= 1000 * 1000 * 1000) {
4926 		pr_warn("ndelay must be less than 1 second, ignored\n");
4927 		sdebug_ndelay = 0;
4928 	} else if (sdebug_ndelay > 0)
4929 		sdebug_jdelay = JDELAY_OVERRIDDEN;
4930 
4931 	switch (sdebug_sector_size) {
4932 	case  512:
4933 	case 1024:
4934 	case 2048:
4935 	case 4096:
4936 		break;
4937 	default:
4938 		pr_err("invalid sector_size %d\n", sdebug_sector_size);
4939 		return -EINVAL;
4940 	}
4941 
4942 	switch (sdebug_dif) {
4943 	case T10_PI_TYPE0_PROTECTION:
4944 		break;
4945 	case T10_PI_TYPE1_PROTECTION:
4946 	case T10_PI_TYPE2_PROTECTION:
4947 	case T10_PI_TYPE3_PROTECTION:
4948 		have_dif_prot = true;
4949 		break;
4950 
4951 	default:
4952 		pr_err("dif must be 0, 1, 2 or 3\n");
4953 		return -EINVAL;
4954 	}
4955 
4956 	if (sdebug_guard > 1) {
4957 		pr_err("guard must be 0 or 1\n");
4958 		return -EINVAL;
4959 	}
4960 
4961 	if (sdebug_ato > 1) {
4962 		pr_err("ato must be 0 or 1\n");
4963 		return -EINVAL;
4964 	}
4965 
4966 	if (sdebug_physblk_exp > 15) {
4967 		pr_err("invalid physblk_exp %u\n", sdebug_physblk_exp);
4968 		return -EINVAL;
4969 	}
4970 	if (sdebug_max_luns > 256) {
4971 		pr_warn("max_luns can be no more than 256, use default\n");
4972 		sdebug_max_luns = DEF_MAX_LUNS;
4973 	}
4974 
4975 	if (sdebug_lowest_aligned > 0x3fff) {
4976 		pr_err("lowest_aligned too big: %u\n", sdebug_lowest_aligned);
4977 		return -EINVAL;
4978 	}
4979 
4980 	if (submit_queues < 1) {
4981 		pr_err("submit_queues must be 1 or more\n");
4982 		return -EINVAL;
4983 	}
4984 	sdebug_q_arr = kcalloc(submit_queues, sizeof(struct sdebug_queue),
4985 			       GFP_KERNEL);
4986 	if (sdebug_q_arr == NULL)
4987 		return -ENOMEM;
4988 	for (k = 0; k < submit_queues; ++k)
4989 		spin_lock_init(&sdebug_q_arr[k].qc_lock);
4990 
4991 	if (sdebug_dev_size_mb < 1)
4992 		sdebug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
4993 	sz = (unsigned long)sdebug_dev_size_mb * 1048576;
4994 	sdebug_store_sectors = sz / sdebug_sector_size;
4995 	sdebug_capacity = get_sdebug_capacity();
4996 
4997 	/* play around with geometry, don't waste too much on track 0 */
4998 	sdebug_heads = 8;
4999 	sdebug_sectors_per = 32;
5000 	if (sdebug_dev_size_mb >= 256)
5001 		sdebug_heads = 64;
5002 	else if (sdebug_dev_size_mb >= 16)
5003 		sdebug_heads = 32;
5004 	sdebug_cylinders_per = (unsigned long)sdebug_capacity /
5005 			       (sdebug_sectors_per * sdebug_heads);
5006 	if (sdebug_cylinders_per >= 1024) {
5007 		/* other LLDs do this; implies >= 1GB ram disk ... */
5008 		sdebug_heads = 255;
5009 		sdebug_sectors_per = 63;
5010 		sdebug_cylinders_per = (unsigned long)sdebug_capacity /
5011 			       (sdebug_sectors_per * sdebug_heads);
5012 	}
5013 
5014 	if (sdebug_fake_rw == 0) {
5015 		fake_storep = vmalloc(sz);
5016 		if (NULL == fake_storep) {
5017 			pr_err("out of memory, 1\n");
5018 			ret = -ENOMEM;
5019 			goto free_q_arr;
5020 		}
5021 		memset(fake_storep, 0, sz);
5022 		if (sdebug_num_parts > 0)
5023 			sdebug_build_parts(fake_storep, sz);
5024 	}
5025 
5026 	if (sdebug_dix) {
5027 		int dif_size;
5028 
5029 		dif_size = sdebug_store_sectors * sizeof(struct t10_pi_tuple);
5030 		dif_storep = vmalloc(dif_size);
5031 
5032 		pr_err("dif_storep %u bytes @ %p\n", dif_size, dif_storep);
5033 
5034 		if (dif_storep == NULL) {
5035 			pr_err("out of mem. (DIX)\n");
5036 			ret = -ENOMEM;
5037 			goto free_vm;
5038 		}
5039 
5040 		memset(dif_storep, 0xff, dif_size);
5041 	}
5042 
5043 	/* Logical Block Provisioning */
5044 	if (scsi_debug_lbp()) {
5045 		sdebug_unmap_max_blocks =
5046 			clamp(sdebug_unmap_max_blocks, 0U, 0xffffffffU);
5047 
5048 		sdebug_unmap_max_desc =
5049 			clamp(sdebug_unmap_max_desc, 0U, 256U);
5050 
5051 		sdebug_unmap_granularity =
5052 			clamp(sdebug_unmap_granularity, 1U, 0xffffffffU);
5053 
5054 		if (sdebug_unmap_alignment &&
5055 		    sdebug_unmap_granularity <=
5056 		    sdebug_unmap_alignment) {
5057 			pr_err("ERR: unmap_granularity <= unmap_alignment\n");
5058 			ret = -EINVAL;
5059 			goto free_vm;
5060 		}
5061 
5062 		map_size = lba_to_map_index(sdebug_store_sectors - 1) + 1;
5063 		map_storep = vmalloc(BITS_TO_LONGS(map_size) * sizeof(long));
5064 
5065 		pr_info("%lu provisioning blocks\n", map_size);
5066 
5067 		if (map_storep == NULL) {
5068 			pr_err("out of mem. (MAP)\n");
5069 			ret = -ENOMEM;
5070 			goto free_vm;
5071 		}
5072 
5073 		bitmap_zero(map_storep, map_size);
5074 
5075 		/* Map first 1KB for partition table */
5076 		if (sdebug_num_parts)
5077 			map_region(0, 2);
5078 	}
5079 
5080 	pseudo_primary = root_device_register("pseudo_0");
5081 	if (IS_ERR(pseudo_primary)) {
5082 		pr_warn("root_device_register() error\n");
5083 		ret = PTR_ERR(pseudo_primary);
5084 		goto free_vm;
5085 	}
5086 	ret = bus_register(&pseudo_lld_bus);
5087 	if (ret < 0) {
5088 		pr_warn("bus_register error: %d\n", ret);
5089 		goto dev_unreg;
5090 	}
5091 	ret = driver_register(&sdebug_driverfs_driver);
5092 	if (ret < 0) {
5093 		pr_warn("driver_register error: %d\n", ret);
5094 		goto bus_unreg;
5095 	}
5096 
5097 	host_to_add = sdebug_add_host;
5098 	sdebug_add_host = 0;
5099 
5100         for (k = 0; k < host_to_add; k++) {
5101                 if (sdebug_add_adapter()) {
5102 			pr_err("sdebug_add_adapter failed k=%d\n", k);
5103                         break;
5104                 }
5105         }
5106 
5107 	if (sdebug_verbose)
5108 		pr_info("built %d host(s)\n", sdebug_add_host);
5109 
5110 	return 0;
5111 
5112 bus_unreg:
5113 	bus_unregister(&pseudo_lld_bus);
5114 dev_unreg:
5115 	root_device_unregister(pseudo_primary);
5116 free_vm:
5117 	vfree(map_storep);
5118 	vfree(dif_storep);
5119 	vfree(fake_storep);
5120 free_q_arr:
5121 	kfree(sdebug_q_arr);
5122 	return ret;
5123 }
5124 
5125 static void __exit scsi_debug_exit(void)
5126 {
5127 	int k = sdebug_add_host;
5128 
5129 	stop_all_queued();
5130 	free_all_queued();
5131 	for (; k; k--)
5132 		sdebug_remove_adapter();
5133 	driver_unregister(&sdebug_driverfs_driver);
5134 	bus_unregister(&pseudo_lld_bus);
5135 	root_device_unregister(pseudo_primary);
5136 
5137 	vfree(dif_storep);
5138 	vfree(fake_storep);
5139 	kfree(sdebug_q_arr);
5140 }
5141 
5142 device_initcall(scsi_debug_init);
5143 module_exit(scsi_debug_exit);
5144 
5145 static void sdebug_release_adapter(struct device * dev)
5146 {
5147         struct sdebug_host_info *sdbg_host;
5148 
5149 	sdbg_host = to_sdebug_host(dev);
5150         kfree(sdbg_host);
5151 }
5152 
5153 static int sdebug_add_adapter(void)
5154 {
5155 	int k, devs_per_host;
5156         int error = 0;
5157         struct sdebug_host_info *sdbg_host;
5158 	struct sdebug_dev_info *sdbg_devinfo, *tmp;
5159 
5160         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
5161         if (NULL == sdbg_host) {
5162 		pr_err("out of memory at line %d\n", __LINE__);
5163                 return -ENOMEM;
5164         }
5165 
5166         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
5167 
5168 	devs_per_host = sdebug_num_tgts * sdebug_max_luns;
5169         for (k = 0; k < devs_per_host; k++) {
5170 		sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
5171 		if (!sdbg_devinfo) {
5172 			pr_err("out of memory at line %d\n", __LINE__);
5173                         error = -ENOMEM;
5174 			goto clean;
5175                 }
5176         }
5177 
5178         spin_lock(&sdebug_host_list_lock);
5179         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
5180         spin_unlock(&sdebug_host_list_lock);
5181 
5182         sdbg_host->dev.bus = &pseudo_lld_bus;
5183         sdbg_host->dev.parent = pseudo_primary;
5184         sdbg_host->dev.release = &sdebug_release_adapter;
5185 	dev_set_name(&sdbg_host->dev, "adapter%d", sdebug_add_host);
5186 
5187         error = device_register(&sdbg_host->dev);
5188 
5189         if (error)
5190 		goto clean;
5191 
5192 	++sdebug_add_host;
5193         return error;
5194 
5195 clean:
5196 	list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
5197 				 dev_list) {
5198 		list_del(&sdbg_devinfo->dev_list);
5199 		kfree(sdbg_devinfo);
5200 	}
5201 
5202 	kfree(sdbg_host);
5203         return error;
5204 }
5205 
5206 static void sdebug_remove_adapter(void)
5207 {
5208         struct sdebug_host_info * sdbg_host = NULL;
5209 
5210         spin_lock(&sdebug_host_list_lock);
5211         if (!list_empty(&sdebug_host_list)) {
5212                 sdbg_host = list_entry(sdebug_host_list.prev,
5213                                        struct sdebug_host_info, host_list);
5214 		list_del(&sdbg_host->host_list);
5215 	}
5216         spin_unlock(&sdebug_host_list_lock);
5217 
5218 	if (!sdbg_host)
5219 		return;
5220 
5221 	device_unregister(&sdbg_host->dev);
5222 	--sdebug_add_host;
5223 }
5224 
5225 static int sdebug_change_qdepth(struct scsi_device *sdev, int qdepth)
5226 {
5227 	int num_in_q = 0;
5228 	struct sdebug_dev_info *devip;
5229 
5230 	block_unblock_all_queues(true);
5231 	devip = (struct sdebug_dev_info *)sdev->hostdata;
5232 	if (NULL == devip) {
5233 		block_unblock_all_queues(false);
5234 		return	-ENODEV;
5235 	}
5236 	num_in_q = atomic_read(&devip->num_in_q);
5237 
5238 	if (qdepth < 1)
5239 		qdepth = 1;
5240 	/* allow to exceed max host qc_arr elements for testing */
5241 	if (qdepth > SDEBUG_CANQUEUE + 10)
5242 		qdepth = SDEBUG_CANQUEUE + 10;
5243 	scsi_change_queue_depth(sdev, qdepth);
5244 
5245 	if (SDEBUG_OPT_Q_NOISE & sdebug_opts) {
5246 		sdev_printk(KERN_INFO, sdev, "%s: qdepth=%d, num_in_q=%d\n",
5247 			    __func__, qdepth, num_in_q);
5248 	}
5249 	block_unblock_all_queues(false);
5250 	return sdev->queue_depth;
5251 }
5252 
5253 static bool fake_timeout(struct scsi_cmnd *scp)
5254 {
5255 	if (0 == (atomic_read(&sdebug_cmnd_count) % abs(sdebug_every_nth))) {
5256 		if (sdebug_every_nth < -1)
5257 			sdebug_every_nth = -1;
5258 		if (SDEBUG_OPT_TIMEOUT & sdebug_opts)
5259 			return true; /* ignore command causing timeout */
5260 		else if (SDEBUG_OPT_MAC_TIMEOUT & sdebug_opts &&
5261 			 scsi_medium_access_command(scp))
5262 			return true; /* time out reads and writes */
5263 	}
5264 	return false;
5265 }
5266 
5267 static int scsi_debug_queuecommand(struct Scsi_Host *shost,
5268 				   struct scsi_cmnd *scp)
5269 {
5270 	u8 sdeb_i;
5271 	struct scsi_device *sdp = scp->device;
5272 	const struct opcode_info_t *oip;
5273 	const struct opcode_info_t *r_oip;
5274 	struct sdebug_dev_info *devip;
5275 	u8 *cmd = scp->cmnd;
5276 	int (*r_pfp)(struct scsi_cmnd *, struct sdebug_dev_info *);
5277 	int k, na;
5278 	int errsts = 0;
5279 	u32 flags;
5280 	u16 sa;
5281 	u8 opcode = cmd[0];
5282 	bool has_wlun_rl;
5283 
5284 	scsi_set_resid(scp, 0);
5285 	if (sdebug_statistics)
5286 		atomic_inc(&sdebug_cmnd_count);
5287 	if (unlikely(sdebug_verbose &&
5288 		     !(SDEBUG_OPT_NO_CDB_NOISE & sdebug_opts))) {
5289 		char b[120];
5290 		int n, len, sb;
5291 
5292 		len = scp->cmd_len;
5293 		sb = (int)sizeof(b);
5294 		if (len > 32)
5295 			strcpy(b, "too long, over 32 bytes");
5296 		else {
5297 			for (k = 0, n = 0; k < len && n < sb; ++k)
5298 				n += scnprintf(b + n, sb - n, "%02x ",
5299 					       (u32)cmd[k]);
5300 		}
5301 		if (sdebug_mq_active)
5302 			sdev_printk(KERN_INFO, sdp, "%s: tag=%u, cmd %s\n",
5303 				    my_name, blk_mq_unique_tag(scp->request),
5304 				    b);
5305 		else
5306 			sdev_printk(KERN_INFO, sdp, "%s: cmd %s\n", my_name,
5307 				    b);
5308 	}
5309 	has_wlun_rl = (sdp->lun == SCSI_W_LUN_REPORT_LUNS);
5310 	if (unlikely((sdp->lun >= sdebug_max_luns) && !has_wlun_rl))
5311 		goto err_out;
5312 
5313 	sdeb_i = opcode_ind_arr[opcode];	/* fully mapped */
5314 	oip = &opcode_info_arr[sdeb_i];		/* safe if table consistent */
5315 	devip = (struct sdebug_dev_info *)sdp->hostdata;
5316 	if (unlikely(!devip)) {
5317 		devip = find_build_dev_info(sdp);
5318 		if (NULL == devip)
5319 			goto err_out;
5320 	}
5321 	na = oip->num_attached;
5322 	r_pfp = oip->pfp;
5323 	if (na) {	/* multiple commands with this opcode */
5324 		r_oip = oip;
5325 		if (FF_SA & r_oip->flags) {
5326 			if (F_SA_LOW & oip->flags)
5327 				sa = 0x1f & cmd[1];
5328 			else
5329 				sa = get_unaligned_be16(cmd + 8);
5330 			for (k = 0; k <= na; oip = r_oip->arrp + k++) {
5331 				if (opcode == oip->opcode && sa == oip->sa)
5332 					break;
5333 			}
5334 		} else {   /* since no service action only check opcode */
5335 			for (k = 0; k <= na; oip = r_oip->arrp + k++) {
5336 				if (opcode == oip->opcode)
5337 					break;
5338 			}
5339 		}
5340 		if (k > na) {
5341 			if (F_SA_LOW & r_oip->flags)
5342 				mk_sense_invalid_fld(scp, SDEB_IN_CDB, 1, 4);
5343 			else if (F_SA_HIGH & r_oip->flags)
5344 				mk_sense_invalid_fld(scp, SDEB_IN_CDB, 8, 7);
5345 			else
5346 				mk_sense_invalid_opcode(scp);
5347 			goto check_cond;
5348 		}
5349 	}	/* else (when na==0) we assume the oip is a match */
5350 	flags = oip->flags;
5351 	if (unlikely(F_INV_OP & flags)) {
5352 		mk_sense_invalid_opcode(scp);
5353 		goto check_cond;
5354 	}
5355 	if (unlikely(has_wlun_rl && !(F_RL_WLUN_OK & flags))) {
5356 		if (sdebug_verbose)
5357 			sdev_printk(KERN_INFO, sdp, "%s: Opcode 0x%x not%s\n",
5358 				    my_name, opcode, " supported for wlun");
5359 		mk_sense_invalid_opcode(scp);
5360 		goto check_cond;
5361 	}
5362 	if (unlikely(sdebug_strict)) {	/* check cdb against mask */
5363 		u8 rem;
5364 		int j;
5365 
5366 		for (k = 1; k < oip->len_mask[0] && k < 16; ++k) {
5367 			rem = ~oip->len_mask[k] & cmd[k];
5368 			if (rem) {
5369 				for (j = 7; j >= 0; --j, rem <<= 1) {
5370 					if (0x80 & rem)
5371 						break;
5372 				}
5373 				mk_sense_invalid_fld(scp, SDEB_IN_CDB, k, j);
5374 				goto check_cond;
5375 			}
5376 		}
5377 	}
5378 	if (unlikely(!(F_SKIP_UA & flags) &&
5379 		     find_first_bit(devip->uas_bm,
5380 				    SDEBUG_NUM_UAS) != SDEBUG_NUM_UAS)) {
5381 		errsts = make_ua(scp, devip);
5382 		if (errsts)
5383 			goto check_cond;
5384 	}
5385 	if (unlikely((F_M_ACCESS & flags) && atomic_read(&devip->stopped))) {
5386 		mk_sense_buffer(scp, NOT_READY, LOGICAL_UNIT_NOT_READY, 0x2);
5387 		if (sdebug_verbose)
5388 			sdev_printk(KERN_INFO, sdp, "%s reports: Not ready: "
5389 				    "%s\n", my_name, "initializing command "
5390 				    "required");
5391 		errsts = check_condition_result;
5392 		goto fini;
5393 	}
5394 	if (sdebug_fake_rw && (F_FAKE_RW & flags))
5395 		goto fini;
5396 	if (unlikely(sdebug_every_nth)) {
5397 		if (fake_timeout(scp))
5398 			return 0;	/* ignore command: make trouble */
5399 	}
5400 	if (likely(oip->pfp))
5401 		errsts = oip->pfp(scp, devip);	/* calls a resp_* function */
5402 	else if (r_pfp)	/* if leaf function ptr NULL, try the root's */
5403 		errsts = r_pfp(scp, devip);
5404 
5405 fini:
5406 	return schedule_resp(scp, devip, errsts,
5407 			     ((F_DELAY_OVERR & flags) ? 0 : sdebug_jdelay));
5408 check_cond:
5409 	return schedule_resp(scp, devip, check_condition_result, 0);
5410 err_out:
5411 	return schedule_resp(scp, NULL, DID_NO_CONNECT << 16, 0);
5412 }
5413 
5414 static struct scsi_host_template sdebug_driver_template = {
5415 	.show_info =		scsi_debug_show_info,
5416 	.write_info =		scsi_debug_write_info,
5417 	.proc_name =		sdebug_proc_name,
5418 	.name =			"SCSI DEBUG",
5419 	.info =			scsi_debug_info,
5420 	.slave_alloc =		scsi_debug_slave_alloc,
5421 	.slave_configure =	scsi_debug_slave_configure,
5422 	.slave_destroy =	scsi_debug_slave_destroy,
5423 	.ioctl =		scsi_debug_ioctl,
5424 	.queuecommand =		scsi_debug_queuecommand,
5425 	.change_queue_depth =	sdebug_change_qdepth,
5426 	.eh_abort_handler =	scsi_debug_abort,
5427 	.eh_device_reset_handler = scsi_debug_device_reset,
5428 	.eh_target_reset_handler = scsi_debug_target_reset,
5429 	.eh_bus_reset_handler = scsi_debug_bus_reset,
5430 	.eh_host_reset_handler = scsi_debug_host_reset,
5431 	.can_queue =		SDEBUG_CANQUEUE,
5432 	.this_id =		7,
5433 	.sg_tablesize =		SG_MAX_SEGMENTS,
5434 	.cmd_per_lun =		DEF_CMD_PER_LUN,
5435 	.max_sectors =		-1U,
5436 	.use_clustering = 	DISABLE_CLUSTERING,
5437 	.module =		THIS_MODULE,
5438 	.track_queue_depth =	1,
5439 };
5440 
5441 static int sdebug_driver_probe(struct device * dev)
5442 {
5443 	int error = 0;
5444 	struct sdebug_host_info *sdbg_host;
5445 	struct Scsi_Host *hpnt;
5446 	int hprot;
5447 
5448 	sdbg_host = to_sdebug_host(dev);
5449 
5450 	sdebug_driver_template.can_queue = sdebug_max_queue;
5451 	if (sdebug_clustering)
5452 		sdebug_driver_template.use_clustering = ENABLE_CLUSTERING;
5453 	hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
5454 	if (NULL == hpnt) {
5455 		pr_err("scsi_host_alloc failed\n");
5456 		error = -ENODEV;
5457 		return error;
5458 	}
5459 	if (submit_queues > nr_cpu_ids) {
5460 		pr_warn("%s: trim submit_queues (was %d) to nr_cpu_ids=%d\n",
5461 			my_name, submit_queues, nr_cpu_ids);
5462 		submit_queues = nr_cpu_ids;
5463 	}
5464 	/* Decide whether to tell scsi subsystem that we want mq */
5465 	/* Following should give the same answer for each host */
5466 	sdebug_mq_active = shost_use_blk_mq(hpnt) && (submit_queues > 1);
5467 	if (sdebug_mq_active)
5468 		hpnt->nr_hw_queues = submit_queues;
5469 
5470         sdbg_host->shost = hpnt;
5471 	*((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
5472 	if ((hpnt->this_id >= 0) && (sdebug_num_tgts > hpnt->this_id))
5473 		hpnt->max_id = sdebug_num_tgts + 1;
5474 	else
5475 		hpnt->max_id = sdebug_num_tgts;
5476 	/* = sdebug_max_luns; */
5477 	hpnt->max_lun = SCSI_W_LUN_REPORT_LUNS + 1;
5478 
5479 	hprot = 0;
5480 
5481 	switch (sdebug_dif) {
5482 
5483 	case T10_PI_TYPE1_PROTECTION:
5484 		hprot = SHOST_DIF_TYPE1_PROTECTION;
5485 		if (sdebug_dix)
5486 			hprot |= SHOST_DIX_TYPE1_PROTECTION;
5487 		break;
5488 
5489 	case T10_PI_TYPE2_PROTECTION:
5490 		hprot = SHOST_DIF_TYPE2_PROTECTION;
5491 		if (sdebug_dix)
5492 			hprot |= SHOST_DIX_TYPE2_PROTECTION;
5493 		break;
5494 
5495 	case T10_PI_TYPE3_PROTECTION:
5496 		hprot = SHOST_DIF_TYPE3_PROTECTION;
5497 		if (sdebug_dix)
5498 			hprot |= SHOST_DIX_TYPE3_PROTECTION;
5499 		break;
5500 
5501 	default:
5502 		if (sdebug_dix)
5503 			hprot |= SHOST_DIX_TYPE0_PROTECTION;
5504 		break;
5505 	}
5506 
5507 	scsi_host_set_prot(hpnt, hprot);
5508 
5509 	if (have_dif_prot || sdebug_dix)
5510 		pr_info("host protection%s%s%s%s%s%s%s\n",
5511 			(hprot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
5512 			(hprot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
5513 			(hprot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
5514 			(hprot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
5515 			(hprot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
5516 			(hprot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
5517 			(hprot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
5518 
5519 	if (sdebug_guard == 1)
5520 		scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
5521 	else
5522 		scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
5523 
5524 	sdebug_verbose = !!(SDEBUG_OPT_NOISE & sdebug_opts);
5525 	sdebug_any_injecting_opt = !!(SDEBUG_OPT_ALL_INJECTING & sdebug_opts);
5526 	if (sdebug_every_nth)	/* need stats counters for every_nth */
5527 		sdebug_statistics = true;
5528         error = scsi_add_host(hpnt, &sdbg_host->dev);
5529         if (error) {
5530 		pr_err("scsi_add_host failed\n");
5531                 error = -ENODEV;
5532 		scsi_host_put(hpnt);
5533         } else
5534 		scsi_scan_host(hpnt);
5535 
5536 	return error;
5537 }
5538 
5539 static int sdebug_driver_remove(struct device * dev)
5540 {
5541         struct sdebug_host_info *sdbg_host;
5542 	struct sdebug_dev_info *sdbg_devinfo, *tmp;
5543 
5544 	sdbg_host = to_sdebug_host(dev);
5545 
5546 	if (!sdbg_host) {
5547 		pr_err("Unable to locate host info\n");
5548 		return -ENODEV;
5549 	}
5550 
5551         scsi_remove_host(sdbg_host->shost);
5552 
5553 	list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
5554 				 dev_list) {
5555                 list_del(&sdbg_devinfo->dev_list);
5556                 kfree(sdbg_devinfo);
5557         }
5558 
5559         scsi_host_put(sdbg_host->shost);
5560         return 0;
5561 }
5562 
5563 static int pseudo_lld_bus_match(struct device *dev,
5564 				struct device_driver *dev_driver)
5565 {
5566 	return 1;
5567 }
5568 
5569 static struct bus_type pseudo_lld_bus = {
5570 	.name = "pseudo",
5571 	.match = pseudo_lld_bus_match,
5572 	.probe = sdebug_driver_probe,
5573 	.remove = sdebug_driver_remove,
5574 	.drv_groups = sdebug_drv_groups,
5575 };
5576