[SCSI] ses: add subenclosure support
[linux-2.6.git] / drivers / scsi / scsi_debug.c
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  *  This version is more generic, simulating a variable number of disk
10  *  (or disk like devices) sharing a common amount of RAM. To be more
11  *  realistic, the simulated devices have the transport attributes of
12  *  SAS disks.
13  *
14  *
15  *  For documentation see http://sg.danny.cz/sg/sdebug26.html
16  *
17  *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
18  *   dpg: work for devfs large number of disks [20010809]
19  *        forked for lk 2.5 series [20011216, 20020101]
20  *        use vmalloc() more inquiry+mode_sense [20020302]
21  *        add timers for delayed responses [20020721]
22  *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
23  *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
24  *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
25  *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
26  */
27
28 #include <linux/module.h>
29
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/timer.h>
33 #include <linux/slab.h>
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/genhd.h>
37 #include <linux/fs.h>
38 #include <linux/init.h>
39 #include <linux/proc_fs.h>
40 #include <linux/vmalloc.h>
41 #include <linux/moduleparam.h>
42 #include <linux/scatterlist.h>
43 #include <linux/blkdev.h>
44 #include <linux/crc-t10dif.h>
45
46 #include <net/checksum.h>
47
48 #include <asm/unaligned.h>
49
50 #include <scsi/scsi.h>
51 #include <scsi/scsi_cmnd.h>
52 #include <scsi/scsi_device.h>
53 #include <scsi/scsi_host.h>
54 #include <scsi/scsicam.h>
55 #include <scsi/scsi_eh.h>
56 #include <scsi/scsi_dbg.h>
57
58 #include "sd.h"
59 #include "scsi_logging.h"
60
61 #define SCSI_DEBUG_VERSION "1.82"
62 static const char * scsi_debug_version_date = "20100324";
63
64 /* Additional Sense Code (ASC) */
65 #define NO_ADDITIONAL_SENSE 0x0
66 #define LOGICAL_UNIT_NOT_READY 0x4
67 #define UNRECOVERED_READ_ERR 0x11
68 #define PARAMETER_LIST_LENGTH_ERR 0x1a
69 #define INVALID_OPCODE 0x20
70 #define ADDR_OUT_OF_RANGE 0x21
71 #define INVALID_COMMAND_OPCODE 0x20
72 #define INVALID_FIELD_IN_CDB 0x24
73 #define INVALID_FIELD_IN_PARAM_LIST 0x26
74 #define POWERON_RESET 0x29
75 #define SAVING_PARAMS_UNSUP 0x39
76 #define TRANSPORT_PROBLEM 0x4b
77 #define THRESHOLD_EXCEEDED 0x5d
78 #define LOW_POWER_COND_ON 0x5e
79
80 /* Additional Sense Code Qualifier (ASCQ) */
81 #define ACK_NAK_TO 0x3
82
83 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
84
85 /* Default values for driver parameters */
86 #define DEF_NUM_HOST   1
87 #define DEF_NUM_TGTS   1
88 #define DEF_MAX_LUNS   1
89 /* With these defaults, this driver will make 1 host with 1 target
90  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
91  */
92 #define DEF_ATO 1
93 #define DEF_DELAY   1
94 #define DEF_DEV_SIZE_MB   8
95 #define DEF_DIF 0
96 #define DEF_DIX 0
97 #define DEF_D_SENSE   0
98 #define DEF_EVERY_NTH   0
99 #define DEF_FAKE_RW     0
100 #define DEF_GUARD 0
101 #define DEF_LBPU 0
102 #define DEF_LBPWS 0
103 #define DEF_LBPWS10 0
104 #define DEF_LOWEST_ALIGNED 0
105 #define DEF_NO_LUN_0   0
106 #define DEF_NUM_PARTS   0
107 #define DEF_OPTS   0
108 #define DEF_OPT_BLKS 64
109 #define DEF_PHYSBLK_EXP 0
110 #define DEF_PTYPE   0
111 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
112 #define DEF_SECTOR_SIZE 512
113 #define DEF_UNMAP_ALIGNMENT 0
114 #define DEF_UNMAP_GRANULARITY 1
115 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
116 #define DEF_UNMAP_MAX_DESC 256
117 #define DEF_VIRTUAL_GB   0
118 #define DEF_VPD_USE_HOSTNO 1
119 #define DEF_WRITESAME_LENGTH 0xFFFF
120
121 /* bit mask values for scsi_debug_opts */
122 #define SCSI_DEBUG_OPT_NOISE   1
123 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
124 #define SCSI_DEBUG_OPT_TIMEOUT   4
125 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
126 #define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
127 #define SCSI_DEBUG_OPT_DIF_ERR   32
128 #define SCSI_DEBUG_OPT_DIX_ERR   64
129 /* When "every_nth" > 0 then modulo "every_nth" commands:
130  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
131  *   - a RECOVERED_ERROR is simulated on successful read and write
132  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
133  *   - a TRANSPORT_ERROR is simulated on successful read and write
134  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
135  *
136  * When "every_nth" < 0 then after "- every_nth" commands:
137  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
138  *   - a RECOVERED_ERROR is simulated on successful read and write
139  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
140  *   - a TRANSPORT_ERROR is simulated on successful read and write
141  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
142  * This will continue until some other action occurs (e.g. the user
143  * writing a new value (other than -1 or 1) to every_nth via sysfs).
144  */
145
146 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
147  * sector on read commands: */
148 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
149 #define OPT_MEDIUM_ERR_NUM    10     /* number of consecutive medium errs */
150
151 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
152  * or "peripheral device" addressing (value 0) */
153 #define SAM2_LUN_ADDRESS_METHOD 0
154 #define SAM2_WLUN_REPORT_LUNS 0xc101
155
156 /* Can queue up to this number of commands. Typically commands that
157  * that have a non-zero delay are queued. */
158 #define SCSI_DEBUG_CANQUEUE  255
159
160 static int scsi_debug_add_host = DEF_NUM_HOST;
161 static int scsi_debug_ato = DEF_ATO;
162 static int scsi_debug_delay = DEF_DELAY;
163 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
164 static int scsi_debug_dif = DEF_DIF;
165 static int scsi_debug_dix = DEF_DIX;
166 static int scsi_debug_dsense = DEF_D_SENSE;
167 static int scsi_debug_every_nth = DEF_EVERY_NTH;
168 static int scsi_debug_fake_rw = DEF_FAKE_RW;
169 static int scsi_debug_guard = DEF_GUARD;
170 static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
171 static int scsi_debug_max_luns = DEF_MAX_LUNS;
172 static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
173 static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
174 static int scsi_debug_no_uld = 0;
175 static int scsi_debug_num_parts = DEF_NUM_PARTS;
176 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
177 static int scsi_debug_opt_blks = DEF_OPT_BLKS;
178 static int scsi_debug_opts = DEF_OPTS;
179 static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
180 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
181 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
182 static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
183 static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
184 static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
185 static unsigned int scsi_debug_lbpu = DEF_LBPU;
186 static unsigned int scsi_debug_lbpws = DEF_LBPWS;
187 static unsigned int scsi_debug_lbpws10 = DEF_LBPWS10;
188 static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
189 static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
190 static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
191 static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
192 static unsigned int scsi_debug_write_same_length = DEF_WRITESAME_LENGTH;
193
194 static int scsi_debug_cmnd_count = 0;
195
196 #define DEV_READONLY(TGT)      (0)
197 #define DEV_REMOVEABLE(TGT)    (0)
198
199 static unsigned int sdebug_store_sectors;
200 static sector_t sdebug_capacity;        /* in sectors */
201
202 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
203    may still need them */
204 static int sdebug_heads;                /* heads per disk */
205 static int sdebug_cylinders_per;        /* cylinders per surface */
206 static int sdebug_sectors_per;          /* sectors per cylinder */
207
208 #define SDEBUG_MAX_PARTS 4
209
210 #define SDEBUG_SENSE_LEN 32
211
212 #define SCSI_DEBUG_MAX_CMD_LEN 32
213
214 static unsigned int scsi_debug_lbp(void)
215 {
216         return scsi_debug_lbpu | scsi_debug_lbpws | scsi_debug_lbpws10;
217 }
218
219 struct sdebug_dev_info {
220         struct list_head dev_list;
221         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
222         unsigned int channel;
223         unsigned int target;
224         unsigned int lun;
225         struct sdebug_host_info *sdbg_host;
226         unsigned int wlun;
227         char reset;
228         char stopped;
229         char used;
230 };
231
232 struct sdebug_host_info {
233         struct list_head host_list;
234         struct Scsi_Host *shost;
235         struct device dev;
236         struct list_head dev_info_list;
237 };
238
239 #define to_sdebug_host(d)       \
240         container_of(d, struct sdebug_host_info, dev)
241
242 static LIST_HEAD(sdebug_host_list);
243 static DEFINE_SPINLOCK(sdebug_host_list_lock);
244
245 typedef void (* done_funct_t) (struct scsi_cmnd *);
246
247 struct sdebug_queued_cmd {
248         int in_use;
249         struct timer_list cmnd_timer;
250         done_funct_t done_funct;
251         struct scsi_cmnd * a_cmnd;
252         int scsi_result;
253 };
254 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
255
256 static unsigned char * fake_storep;     /* ramdisk storage */
257 static unsigned char *dif_storep;       /* protection info */
258 static void *map_storep;                /* provisioning map */
259
260 static unsigned long map_size;
261 static int num_aborts = 0;
262 static int num_dev_resets = 0;
263 static int num_bus_resets = 0;
264 static int num_host_resets = 0;
265 static int dix_writes;
266 static int dix_reads;
267 static int dif_errors;
268
269 static DEFINE_SPINLOCK(queued_arr_lock);
270 static DEFINE_RWLOCK(atomic_rw);
271
272 static char sdebug_proc_name[] = "scsi_debug";
273
274 static struct bus_type pseudo_lld_bus;
275
276 static inline sector_t dif_offset(sector_t sector)
277 {
278         return sector << 3;
279 }
280
281 static struct device_driver sdebug_driverfs_driver = {
282         .name           = sdebug_proc_name,
283         .bus            = &pseudo_lld_bus,
284 };
285
286 static const int check_condition_result =
287                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
288
289 static const int illegal_condition_result =
290         (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
291
292 static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
293                                     0, 0, 0x2, 0x4b};
294 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
295                                    0, 0, 0x0, 0x0};
296
297 static int sdebug_add_adapter(void);
298 static void sdebug_remove_adapter(void);
299
300 static void sdebug_max_tgts_luns(void)
301 {
302         struct sdebug_host_info *sdbg_host;
303         struct Scsi_Host *hpnt;
304
305         spin_lock(&sdebug_host_list_lock);
306         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
307                 hpnt = sdbg_host->shost;
308                 if ((hpnt->this_id >= 0) &&
309                     (scsi_debug_num_tgts > hpnt->this_id))
310                         hpnt->max_id = scsi_debug_num_tgts + 1;
311                 else
312                         hpnt->max_id = scsi_debug_num_tgts;
313                 /* scsi_debug_max_luns; */
314                 hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;
315         }
316         spin_unlock(&sdebug_host_list_lock);
317 }
318
319 static void mk_sense_buffer(struct sdebug_dev_info *devip, int key,
320                             int asc, int asq)
321 {
322         unsigned char *sbuff;
323
324         sbuff = devip->sense_buff;
325         memset(sbuff, 0, SDEBUG_SENSE_LEN);
326
327         scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, asq);
328
329         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
330                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
331                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
332 }
333
334 static void get_data_transfer_info(unsigned char *cmd,
335                                    unsigned long long *lba, unsigned int *num,
336                                    u32 *ei_lba)
337 {
338         *ei_lba = 0;
339
340         switch (*cmd) {
341         case VARIABLE_LENGTH_CMD:
342                 *lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
343                         (u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
344                         (u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
345                         (u64)cmd[13] << 48 | (u64)cmd[12] << 56;
346
347                 *ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
348                         (u32)cmd[21] << 16 | (u32)cmd[20] << 24;
349
350                 *num = (u32)cmd[31] | (u32)cmd[30] << 8 | (u32)cmd[29] << 16 |
351                         (u32)cmd[28] << 24;
352                 break;
353
354         case WRITE_SAME_16:
355         case WRITE_16:
356         case READ_16:
357                 *lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
358                         (u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
359                         (u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
360                         (u64)cmd[3] << 48 | (u64)cmd[2] << 56;
361
362                 *num = (u32)cmd[13] | (u32)cmd[12] << 8 | (u32)cmd[11] << 16 |
363                         (u32)cmd[10] << 24;
364                 break;
365         case WRITE_12:
366         case READ_12:
367                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
368                         (u32)cmd[2] << 24;
369
370                 *num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7] << 16 |
371                         (u32)cmd[6] << 24;
372                 break;
373         case WRITE_SAME:
374         case WRITE_10:
375         case READ_10:
376         case XDWRITEREAD_10:
377                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
378                         (u32)cmd[2] << 24;
379
380                 *num = (u32)cmd[8] | (u32)cmd[7] << 8;
381                 break;
382         case WRITE_6:
383         case READ_6:
384                 *lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
385                         (u32)(cmd[1] & 0x1f) << 16;
386                 *num = (0 == cmd[4]) ? 256 : cmd[4];
387                 break;
388         default:
389                 break;
390         }
391 }
392
393 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
394 {
395         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
396                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
397         }
398         return -EINVAL;
399         /* return -ENOTTY; // correct return but upsets fdisk */
400 }
401
402 static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
403                            struct sdebug_dev_info * devip)
404 {
405         if (devip->reset) {
406                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
407                         printk(KERN_INFO "scsi_debug: Reporting Unit "
408                                "attention: power on reset\n");
409                 devip->reset = 0;
410                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
411                 return check_condition_result;
412         }
413         if ((0 == reset_only) && devip->stopped) {
414                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
415                         printk(KERN_INFO "scsi_debug: Reporting Not "
416                                "ready: initializing command required\n");
417                 mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
418                                 0x2);
419                 return check_condition_result;
420         }
421         return 0;
422 }
423
424 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
425 static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
426                                 int arr_len)
427 {
428         int act_len;
429         struct scsi_data_buffer *sdb = scsi_in(scp);
430
431         if (!sdb->length)
432                 return 0;
433         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
434                 return (DID_ERROR << 16);
435
436         act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
437                                       arr, arr_len);
438         if (sdb->resid)
439                 sdb->resid -= act_len;
440         else
441                 sdb->resid = scsi_bufflen(scp) - act_len;
442
443         return 0;
444 }
445
446 /* Returns number of bytes fetched into 'arr' or -1 if error. */
447 static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
448                                int arr_len)
449 {
450         if (!scsi_bufflen(scp))
451                 return 0;
452         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
453                 return -1;
454
455         return scsi_sg_copy_to_buffer(scp, arr, arr_len);
456 }
457
458
459 static const char * inq_vendor_id = "Linux   ";
460 static const char * inq_product_id = "scsi_debug      ";
461 static const char * inq_product_rev = "0004";
462
463 static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
464                            int target_dev_id, int dev_id_num,
465                            const char * dev_id_str,
466                            int dev_id_str_len)
467 {
468         int num, port_a;
469         char b[32];
470
471         port_a = target_dev_id + 1;
472         /* T10 vendor identifier field format (faked) */
473         arr[0] = 0x2;   /* ASCII */
474         arr[1] = 0x1;
475         arr[2] = 0x0;
476         memcpy(&arr[4], inq_vendor_id, 8);
477         memcpy(&arr[12], inq_product_id, 16);
478         memcpy(&arr[28], dev_id_str, dev_id_str_len);
479         num = 8 + 16 + dev_id_str_len;
480         arr[3] = num;
481         num += 4;
482         if (dev_id_num >= 0) {
483                 /* NAA-5, Logical unit identifier (binary) */
484                 arr[num++] = 0x1;       /* binary (not necessarily sas) */
485                 arr[num++] = 0x3;       /* PIV=0, lu, naa */
486                 arr[num++] = 0x0;
487                 arr[num++] = 0x8;
488                 arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
489                 arr[num++] = 0x33;
490                 arr[num++] = 0x33;
491                 arr[num++] = 0x30;
492                 arr[num++] = (dev_id_num >> 24);
493                 arr[num++] = (dev_id_num >> 16) & 0xff;
494                 arr[num++] = (dev_id_num >> 8) & 0xff;
495                 arr[num++] = dev_id_num & 0xff;
496                 /* Target relative port number */
497                 arr[num++] = 0x61;      /* proto=sas, binary */
498                 arr[num++] = 0x94;      /* PIV=1, target port, rel port */
499                 arr[num++] = 0x0;       /* reserved */
500                 arr[num++] = 0x4;       /* length */
501                 arr[num++] = 0x0;       /* reserved */
502                 arr[num++] = 0x0;       /* reserved */
503                 arr[num++] = 0x0;
504                 arr[num++] = 0x1;       /* relative port A */
505         }
506         /* NAA-5, Target port identifier */
507         arr[num++] = 0x61;      /* proto=sas, binary */
508         arr[num++] = 0x93;      /* piv=1, target port, naa */
509         arr[num++] = 0x0;
510         arr[num++] = 0x8;
511         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
512         arr[num++] = 0x22;
513         arr[num++] = 0x22;
514         arr[num++] = 0x20;
515         arr[num++] = (port_a >> 24);
516         arr[num++] = (port_a >> 16) & 0xff;
517         arr[num++] = (port_a >> 8) & 0xff;
518         arr[num++] = port_a & 0xff;
519         /* NAA-5, Target port group identifier */
520         arr[num++] = 0x61;      /* proto=sas, binary */
521         arr[num++] = 0x95;      /* piv=1, target port group id */
522         arr[num++] = 0x0;
523         arr[num++] = 0x4;
524         arr[num++] = 0;
525         arr[num++] = 0;
526         arr[num++] = (port_group_id >> 8) & 0xff;
527         arr[num++] = port_group_id & 0xff;
528         /* NAA-5, Target device identifier */
529         arr[num++] = 0x61;      /* proto=sas, binary */
530         arr[num++] = 0xa3;      /* piv=1, target device, naa */
531         arr[num++] = 0x0;
532         arr[num++] = 0x8;
533         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
534         arr[num++] = 0x22;
535         arr[num++] = 0x22;
536         arr[num++] = 0x20;
537         arr[num++] = (target_dev_id >> 24);
538         arr[num++] = (target_dev_id >> 16) & 0xff;
539         arr[num++] = (target_dev_id >> 8) & 0xff;
540         arr[num++] = target_dev_id & 0xff;
541         /* SCSI name string: Target device identifier */
542         arr[num++] = 0x63;      /* proto=sas, UTF-8 */
543         arr[num++] = 0xa8;      /* piv=1, target device, SCSI name string */
544         arr[num++] = 0x0;
545         arr[num++] = 24;
546         memcpy(arr + num, "naa.52222220", 12);
547         num += 12;
548         snprintf(b, sizeof(b), "%08X", target_dev_id);
549         memcpy(arr + num, b, 8);
550         num += 8;
551         memset(arr + num, 0, 4);
552         num += 4;
553         return num;
554 }
555
556
557 static unsigned char vpd84_data[] = {
558 /* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
559     0x22,0x22,0x22,0x0,0xbb,0x1,
560     0x22,0x22,0x22,0x0,0xbb,0x2,
561 };
562
563 static int inquiry_evpd_84(unsigned char * arr)
564 {
565         memcpy(arr, vpd84_data, sizeof(vpd84_data));
566         return sizeof(vpd84_data);
567 }
568
569 static int inquiry_evpd_85(unsigned char * arr)
570 {
571         int num = 0;
572         const char * na1 = "https://www.kernel.org/config";
573         const char * na2 = "http://www.kernel.org/log";
574         int plen, olen;
575
576         arr[num++] = 0x1;       /* lu, storage config */
577         arr[num++] = 0x0;       /* reserved */
578         arr[num++] = 0x0;
579         olen = strlen(na1);
580         plen = olen + 1;
581         if (plen % 4)
582                 plen = ((plen / 4) + 1) * 4;
583         arr[num++] = plen;      /* length, null termianted, padded */
584         memcpy(arr + num, na1, olen);
585         memset(arr + num + olen, 0, plen - olen);
586         num += plen;
587
588         arr[num++] = 0x4;       /* lu, logging */
589         arr[num++] = 0x0;       /* reserved */
590         arr[num++] = 0x0;
591         olen = strlen(na2);
592         plen = olen + 1;
593         if (plen % 4)
594                 plen = ((plen / 4) + 1) * 4;
595         arr[num++] = plen;      /* length, null terminated, padded */
596         memcpy(arr + num, na2, olen);
597         memset(arr + num + olen, 0, plen - olen);
598         num += plen;
599
600         return num;
601 }
602
603 /* SCSI ports VPD page */
604 static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
605 {
606         int num = 0;
607         int port_a, port_b;
608
609         port_a = target_dev_id + 1;
610         port_b = port_a + 1;
611         arr[num++] = 0x0;       /* reserved */
612         arr[num++] = 0x0;       /* reserved */
613         arr[num++] = 0x0;
614         arr[num++] = 0x1;       /* relative port 1 (primary) */
615         memset(arr + num, 0, 6);
616         num += 6;
617         arr[num++] = 0x0;
618         arr[num++] = 12;        /* length tp descriptor */
619         /* naa-5 target port identifier (A) */
620         arr[num++] = 0x61;      /* proto=sas, binary */
621         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
622         arr[num++] = 0x0;       /* reserved */
623         arr[num++] = 0x8;       /* length */
624         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
625         arr[num++] = 0x22;
626         arr[num++] = 0x22;
627         arr[num++] = 0x20;
628         arr[num++] = (port_a >> 24);
629         arr[num++] = (port_a >> 16) & 0xff;
630         arr[num++] = (port_a >> 8) & 0xff;
631         arr[num++] = port_a & 0xff;
632
633         arr[num++] = 0x0;       /* reserved */
634         arr[num++] = 0x0;       /* reserved */
635         arr[num++] = 0x0;
636         arr[num++] = 0x2;       /* relative port 2 (secondary) */
637         memset(arr + num, 0, 6);
638         num += 6;
639         arr[num++] = 0x0;
640         arr[num++] = 12;        /* length tp descriptor */
641         /* naa-5 target port identifier (B) */
642         arr[num++] = 0x61;      /* proto=sas, binary */
643         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
644         arr[num++] = 0x0;       /* reserved */
645         arr[num++] = 0x8;       /* length */
646         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
647         arr[num++] = 0x22;
648         arr[num++] = 0x22;
649         arr[num++] = 0x20;
650         arr[num++] = (port_b >> 24);
651         arr[num++] = (port_b >> 16) & 0xff;
652         arr[num++] = (port_b >> 8) & 0xff;
653         arr[num++] = port_b & 0xff;
654
655         return num;
656 }
657
658
659 static unsigned char vpd89_data[] = {
660 /* from 4th byte */ 0,0,0,0,
661 'l','i','n','u','x',' ',' ',' ',
662 'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
663 '1','2','3','4',
664 0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
665 0xec,0,0,0,
666 0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
667 0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
668 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
669 0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
670 0x53,0x41,
671 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
672 0x20,0x20,
673 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
674 0x10,0x80,
675 0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
676 0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
677 0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
678 0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
679 0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
680 0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
681 0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
682 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
683 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
684 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
685 0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
686 0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
687 0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
688 0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
689 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
690 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
691 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
692 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
693 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
694 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
695 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
696 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
697 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
698 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
699 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
700 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
701 };
702
703 static int inquiry_evpd_89(unsigned char * arr)
704 {
705         memcpy(arr, vpd89_data, sizeof(vpd89_data));
706         return sizeof(vpd89_data);
707 }
708
709
710 /* Block limits VPD page (SBC-3) */
711 static unsigned char vpdb0_data[] = {
712         /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
713         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
714         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
715         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
716 };
717
718 static int inquiry_evpd_b0(unsigned char * arr)
719 {
720         unsigned int gran;
721
722         memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
723
724         /* Optimal transfer length granularity */
725         gran = 1 << scsi_debug_physblk_exp;
726         arr[2] = (gran >> 8) & 0xff;
727         arr[3] = gran & 0xff;
728
729         /* Maximum Transfer Length */
730         if (sdebug_store_sectors > 0x400) {
731                 arr[4] = (sdebug_store_sectors >> 24) & 0xff;
732                 arr[5] = (sdebug_store_sectors >> 16) & 0xff;
733                 arr[6] = (sdebug_store_sectors >> 8) & 0xff;
734                 arr[7] = sdebug_store_sectors & 0xff;
735         }
736
737         /* Optimal Transfer Length */
738         put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
739
740         if (scsi_debug_lbpu) {
741                 /* Maximum Unmap LBA Count */
742                 put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]);
743
744                 /* Maximum Unmap Block Descriptor Count */
745                 put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
746         }
747
748         /* Unmap Granularity Alignment */
749         if (scsi_debug_unmap_alignment) {
750                 put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
751                 arr[28] |= 0x80; /* UGAVALID */
752         }
753
754         /* Optimal Unmap Granularity */
755         put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
756
757         /* Maximum WRITE SAME Length */
758         put_unaligned_be64(scsi_debug_write_same_length, &arr[32]);
759
760         return 0x3c; /* Mandatory page length for Logical Block Provisioning */
761
762         return sizeof(vpdb0_data);
763 }
764
765 /* Block device characteristics VPD page (SBC-3) */
766 static int inquiry_evpd_b1(unsigned char *arr)
767 {
768         memset(arr, 0, 0x3c);
769         arr[0] = 0;
770         arr[1] = 1;     /* non rotating medium (e.g. solid state) */
771         arr[2] = 0;
772         arr[3] = 5;     /* less than 1.8" */
773
774         return 0x3c;
775 }
776
777 /* Thin provisioning VPD page (SBC-3) */
778 static int inquiry_evpd_b2(unsigned char *arr)
779 {
780         memset(arr, 0, 0x8);
781         arr[0] = 0;                     /* threshold exponent */
782
783         if (scsi_debug_lbpu)
784                 arr[1] = 1 << 7;
785
786         if (scsi_debug_lbpws)
787                 arr[1] |= 1 << 6;
788
789         if (scsi_debug_lbpws10)
790                 arr[1] |= 1 << 5;
791
792         return 0x8;
793 }
794
795 #define SDEBUG_LONG_INQ_SZ 96
796 #define SDEBUG_MAX_INQ_ARR_SZ 584
797
798 static int resp_inquiry(struct scsi_cmnd * scp, int target,
799                         struct sdebug_dev_info * devip)
800 {
801         unsigned char pq_pdt;
802         unsigned char * arr;
803         unsigned char *cmd = (unsigned char *)scp->cmnd;
804         int alloc_len, n, ret;
805
806         alloc_len = (cmd[3] << 8) + cmd[4];
807         arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
808         if (! arr)
809                 return DID_REQUEUE << 16;
810         if (devip->wlun)
811                 pq_pdt = 0x1e;  /* present, wlun */
812         else if (scsi_debug_no_lun_0 && (0 == devip->lun))
813                 pq_pdt = 0x7f;  /* not present, no device type */
814         else
815                 pq_pdt = (scsi_debug_ptype & 0x1f);
816         arr[0] = pq_pdt;
817         if (0x2 & cmd[1]) {  /* CMDDT bit set */
818                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
819                                 0);
820                 kfree(arr);
821                 return check_condition_result;
822         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
823                 int lu_id_num, port_group_id, target_dev_id, len;
824                 char lu_id_str[6];
825                 int host_no = devip->sdbg_host->shost->host_no;
826                 
827                 port_group_id = (((host_no + 1) & 0x7f) << 8) +
828                     (devip->channel & 0x7f);
829                 if (0 == scsi_debug_vpd_use_hostno)
830                         host_no = 0;
831                 lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
832                             (devip->target * 1000) + devip->lun);
833                 target_dev_id = ((host_no + 1) * 2000) +
834                                  (devip->target * 1000) - 3;
835                 len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
836                 if (0 == cmd[2]) { /* supported vital product data pages */
837                         arr[1] = cmd[2];        /*sanity */
838                         n = 4;
839                         arr[n++] = 0x0;   /* this page */
840                         arr[n++] = 0x80;  /* unit serial number */
841                         arr[n++] = 0x83;  /* device identification */
842                         arr[n++] = 0x84;  /* software interface ident. */
843                         arr[n++] = 0x85;  /* management network addresses */
844                         arr[n++] = 0x86;  /* extended inquiry */
845                         arr[n++] = 0x87;  /* mode page policy */
846                         arr[n++] = 0x88;  /* SCSI ports */
847                         arr[n++] = 0x89;  /* ATA information */
848                         arr[n++] = 0xb0;  /* Block limits (SBC) */
849                         arr[n++] = 0xb1;  /* Block characteristics (SBC) */
850                         if (scsi_debug_lbp()) /* Logical Block Prov. (SBC) */
851                                 arr[n++] = 0xb2;
852                         arr[3] = n - 4;   /* number of supported VPD pages */
853                 } else if (0x80 == cmd[2]) { /* unit serial number */
854                         arr[1] = cmd[2];        /*sanity */
855                         arr[3] = len;
856                         memcpy(&arr[4], lu_id_str, len);
857                 } else if (0x83 == cmd[2]) { /* device identification */
858                         arr[1] = cmd[2];        /*sanity */
859                         arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
860                                                  target_dev_id, lu_id_num,
861                                                  lu_id_str, len);
862                 } else if (0x84 == cmd[2]) { /* Software interface ident. */
863                         arr[1] = cmd[2];        /*sanity */
864                         arr[3] = inquiry_evpd_84(&arr[4]);
865                 } else if (0x85 == cmd[2]) { /* Management network addresses */
866                         arr[1] = cmd[2];        /*sanity */
867                         arr[3] = inquiry_evpd_85(&arr[4]);
868                 } else if (0x86 == cmd[2]) { /* extended inquiry */
869                         arr[1] = cmd[2];        /*sanity */
870                         arr[3] = 0x3c;  /* number of following entries */
871                         if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION)
872                                 arr[4] = 0x4;   /* SPT: GRD_CHK:1 */
873                         else if (scsi_debug_dif)
874                                 arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
875                         else
876                                 arr[4] = 0x0;   /* no protection stuff */
877                         arr[5] = 0x7;   /* head of q, ordered + simple q's */
878                 } else if (0x87 == cmd[2]) { /* mode page policy */
879                         arr[1] = cmd[2];        /*sanity */
880                         arr[3] = 0x8;   /* number of following entries */
881                         arr[4] = 0x2;   /* disconnect-reconnect mp */
882                         arr[6] = 0x80;  /* mlus, shared */
883                         arr[8] = 0x18;   /* protocol specific lu */
884                         arr[10] = 0x82;  /* mlus, per initiator port */
885                 } else if (0x88 == cmd[2]) { /* SCSI Ports */
886                         arr[1] = cmd[2];        /*sanity */
887                         arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
888                 } else if (0x89 == cmd[2]) { /* ATA information */
889                         arr[1] = cmd[2];        /*sanity */
890                         n = inquiry_evpd_89(&arr[4]);
891                         arr[2] = (n >> 8);
892                         arr[3] = (n & 0xff);
893                 } else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
894                         arr[1] = cmd[2];        /*sanity */
895                         arr[3] = inquiry_evpd_b0(&arr[4]);
896                 } else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */
897                         arr[1] = cmd[2];        /*sanity */
898                         arr[3] = inquiry_evpd_b1(&arr[4]);
899                 } else if (0xb2 == cmd[2]) { /* Logical Block Prov. (SBC) */
900                         arr[1] = cmd[2];        /*sanity */
901                         arr[3] = inquiry_evpd_b2(&arr[4]);
902                 } else {
903                         /* Illegal request, invalid field in cdb */
904                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
905                                         INVALID_FIELD_IN_CDB, 0);
906                         kfree(arr);
907                         return check_condition_result;
908                 }
909                 len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
910                 ret = fill_from_dev_buffer(scp, arr,
911                             min(len, SDEBUG_MAX_INQ_ARR_SZ));
912                 kfree(arr);
913                 return ret;
914         }
915         /* drops through here for a standard inquiry */
916         arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;     /* Removable disk */
917         arr[2] = scsi_debug_scsi_level;
918         arr[3] = 2;    /* response_data_format==2 */
919         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
920         arr[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */
921         if (0 == scsi_debug_vpd_use_hostno)
922                 arr[5] = 0x10; /* claim: implicit TGPS */
923         arr[6] = 0x10; /* claim: MultiP */
924         /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
925         arr[7] = 0xa; /* claim: LINKED + CMDQUE */
926         memcpy(&arr[8], inq_vendor_id, 8);
927         memcpy(&arr[16], inq_product_id, 16);
928         memcpy(&arr[32], inq_product_rev, 4);
929         /* version descriptors (2 bytes each) follow */
930         arr[58] = 0x0; arr[59] = 0x77; /* SAM-3 ANSI */
931         arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
932         n = 62;
933         if (scsi_debug_ptype == 0) {
934                 arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
935         } else if (scsi_debug_ptype == 1) {
936                 arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
937         }
938         arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
939         ret = fill_from_dev_buffer(scp, arr,
940                             min(alloc_len, SDEBUG_LONG_INQ_SZ));
941         kfree(arr);
942         return ret;
943 }
944
945 static int resp_requests(struct scsi_cmnd * scp,
946                          struct sdebug_dev_info * devip)
947 {
948         unsigned char * sbuff;
949         unsigned char *cmd = (unsigned char *)scp->cmnd;
950         unsigned char arr[SDEBUG_SENSE_LEN];
951         int want_dsense;
952         int len = 18;
953
954         memset(arr, 0, sizeof(arr));
955         if (devip->reset == 1)
956                 mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
957         want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
958         sbuff = devip->sense_buff;
959         if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
960                 if (want_dsense) {
961                         arr[0] = 0x72;
962                         arr[1] = 0x0;           /* NO_SENSE in sense_key */
963                         arr[2] = THRESHOLD_EXCEEDED;
964                         arr[3] = 0xff;          /* TEST set and MRIE==6 */
965                 } else {
966                         arr[0] = 0x70;
967                         arr[2] = 0x0;           /* NO_SENSE in sense_key */
968                         arr[7] = 0xa;           /* 18 byte sense buffer */
969                         arr[12] = THRESHOLD_EXCEEDED;
970                         arr[13] = 0xff;         /* TEST set and MRIE==6 */
971                 }
972         } else {
973                 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
974                 if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
975                         /* DESC bit set and sense_buff in fixed format */
976                         memset(arr, 0, sizeof(arr));
977                         arr[0] = 0x72;
978                         arr[1] = sbuff[2];     /* sense key */
979                         arr[2] = sbuff[12];    /* asc */
980                         arr[3] = sbuff[13];    /* ascq */
981                         len = 8;
982                 }
983         }
984         mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
985         return fill_from_dev_buffer(scp, arr, len);
986 }
987
988 static int resp_start_stop(struct scsi_cmnd * scp,
989                            struct sdebug_dev_info * devip)
990 {
991         unsigned char *cmd = (unsigned char *)scp->cmnd;
992         int power_cond, errsts, start;
993
994         if ((errsts = check_readiness(scp, 1, devip)))
995                 return errsts;
996         power_cond = (cmd[4] & 0xf0) >> 4;
997         if (power_cond) {
998                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
999                                 0);
1000                 return check_condition_result;
1001         }
1002         start = cmd[4] & 1;
1003         if (start == devip->stopped)
1004                 devip->stopped = !start;
1005         return 0;
1006 }
1007
1008 static sector_t get_sdebug_capacity(void)
1009 {
1010         if (scsi_debug_virtual_gb > 0)
1011                 return (sector_t)scsi_debug_virtual_gb *
1012                         (1073741824 / scsi_debug_sector_size);
1013         else
1014                 return sdebug_store_sectors;
1015 }
1016
1017 #define SDEBUG_READCAP_ARR_SZ 8
1018 static int resp_readcap(struct scsi_cmnd * scp,
1019                         struct sdebug_dev_info * devip)
1020 {
1021         unsigned char arr[SDEBUG_READCAP_ARR_SZ];
1022         unsigned int capac;
1023         int errsts;
1024
1025         if ((errsts = check_readiness(scp, 1, devip)))
1026                 return errsts;
1027         /* following just in case virtual_gb changed */
1028         sdebug_capacity = get_sdebug_capacity();
1029         memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
1030         if (sdebug_capacity < 0xffffffff) {
1031                 capac = (unsigned int)sdebug_capacity - 1;
1032                 arr[0] = (capac >> 24);
1033                 arr[1] = (capac >> 16) & 0xff;
1034                 arr[2] = (capac >> 8) & 0xff;
1035                 arr[3] = capac & 0xff;
1036         } else {
1037                 arr[0] = 0xff;
1038                 arr[1] = 0xff;
1039                 arr[2] = 0xff;
1040                 arr[3] = 0xff;
1041         }
1042         arr[6] = (scsi_debug_sector_size >> 8) & 0xff;
1043         arr[7] = scsi_debug_sector_size & 0xff;
1044         return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
1045 }
1046
1047 #define SDEBUG_READCAP16_ARR_SZ 32
1048 static int resp_readcap16(struct scsi_cmnd * scp,
1049                           struct sdebug_dev_info * devip)
1050 {
1051         unsigned char *cmd = (unsigned char *)scp->cmnd;
1052         unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
1053         unsigned long long capac;
1054         int errsts, k, alloc_len;
1055
1056         if ((errsts = check_readiness(scp, 1, devip)))
1057                 return errsts;
1058         alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
1059                      + cmd[13]);
1060         /* following just in case virtual_gb changed */
1061         sdebug_capacity = get_sdebug_capacity();
1062         memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
1063         capac = sdebug_capacity - 1;
1064         for (k = 0; k < 8; ++k, capac >>= 8)
1065                 arr[7 - k] = capac & 0xff;
1066         arr[8] = (scsi_debug_sector_size >> 24) & 0xff;
1067         arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
1068         arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
1069         arr[11] = scsi_debug_sector_size & 0xff;
1070         arr[13] = scsi_debug_physblk_exp & 0xf;
1071         arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
1072
1073         if (scsi_debug_lbp())
1074                 arr[14] |= 0x80; /* LBPME */
1075
1076         arr[15] = scsi_debug_lowest_aligned & 0xff;
1077
1078         if (scsi_debug_dif) {
1079                 arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
1080                 arr[12] |= 1; /* PROT_EN */
1081         }
1082
1083         return fill_from_dev_buffer(scp, arr,
1084                                     min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
1085 }
1086
1087 #define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
1088
1089 static int resp_report_tgtpgs(struct scsi_cmnd * scp,
1090                               struct sdebug_dev_info * devip)
1091 {
1092         unsigned char *cmd = (unsigned char *)scp->cmnd;
1093         unsigned char * arr;
1094         int host_no = devip->sdbg_host->shost->host_no;
1095         int n, ret, alen, rlen;
1096         int port_group_a, port_group_b, port_a, port_b;
1097
1098         alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
1099                 + cmd[9]);
1100
1101         arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
1102         if (! arr)
1103                 return DID_REQUEUE << 16;
1104         /*
1105          * EVPD page 0x88 states we have two ports, one
1106          * real and a fake port with no device connected.
1107          * So we create two port groups with one port each
1108          * and set the group with port B to unavailable.
1109          */
1110         port_a = 0x1; /* relative port A */
1111         port_b = 0x2; /* relative port B */
1112         port_group_a = (((host_no + 1) & 0x7f) << 8) +
1113             (devip->channel & 0x7f);
1114         port_group_b = (((host_no + 1) & 0x7f) << 8) +
1115             (devip->channel & 0x7f) + 0x80;
1116
1117         /*
1118          * The asymmetric access state is cycled according to the host_id.
1119          */
1120         n = 4;
1121         if (0 == scsi_debug_vpd_use_hostno) {
1122             arr[n++] = host_no % 3; /* Asymm access state */
1123             arr[n++] = 0x0F; /* claim: all states are supported */
1124         } else {
1125             arr[n++] = 0x0; /* Active/Optimized path */
1126             arr[n++] = 0x01; /* claim: only support active/optimized paths */
1127         }
1128         arr[n++] = (port_group_a >> 8) & 0xff;
1129         arr[n++] = port_group_a & 0xff;
1130         arr[n++] = 0;    /* Reserved */
1131         arr[n++] = 0;    /* Status code */
1132         arr[n++] = 0;    /* Vendor unique */
1133         arr[n++] = 0x1;  /* One port per group */
1134         arr[n++] = 0;    /* Reserved */
1135         arr[n++] = 0;    /* Reserved */
1136         arr[n++] = (port_a >> 8) & 0xff;
1137         arr[n++] = port_a & 0xff;
1138         arr[n++] = 3;    /* Port unavailable */
1139         arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
1140         arr[n++] = (port_group_b >> 8) & 0xff;
1141         arr[n++] = port_group_b & 0xff;
1142         arr[n++] = 0;    /* Reserved */
1143         arr[n++] = 0;    /* Status code */
1144         arr[n++] = 0;    /* Vendor unique */
1145         arr[n++] = 0x1;  /* One port per group */
1146         arr[n++] = 0;    /* Reserved */
1147         arr[n++] = 0;    /* Reserved */
1148         arr[n++] = (port_b >> 8) & 0xff;
1149         arr[n++] = port_b & 0xff;
1150
1151         rlen = n - 4;
1152         arr[0] = (rlen >> 24) & 0xff;
1153         arr[1] = (rlen >> 16) & 0xff;
1154         arr[2] = (rlen >> 8) & 0xff;
1155         arr[3] = rlen & 0xff;
1156
1157         /*
1158          * Return the smallest value of either
1159          * - The allocated length
1160          * - The constructed command length
1161          * - The maximum array size
1162          */
1163         rlen = min(alen,n);
1164         ret = fill_from_dev_buffer(scp, arr,
1165                                    min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
1166         kfree(arr);
1167         return ret;
1168 }
1169
1170 /* <<Following mode page info copied from ST318451LW>> */
1171
1172 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
1173 {       /* Read-Write Error Recovery page for mode_sense */
1174         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
1175                                         5, 0, 0xff, 0xff};
1176
1177         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
1178         if (1 == pcontrol)
1179                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
1180         return sizeof(err_recov_pg);
1181 }
1182
1183 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
1184 {       /* Disconnect-Reconnect page for mode_sense */
1185         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
1186                                          0, 0, 0, 0, 0, 0, 0, 0};
1187
1188         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
1189         if (1 == pcontrol)
1190                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
1191         return sizeof(disconnect_pg);
1192 }
1193
1194 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
1195 {       /* Format device page for mode_sense */
1196         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
1197                                      0, 0, 0, 0, 0, 0, 0, 0,
1198                                      0, 0, 0, 0, 0x40, 0, 0, 0};
1199
1200         memcpy(p, format_pg, sizeof(format_pg));
1201         p[10] = (sdebug_sectors_per >> 8) & 0xff;
1202         p[11] = sdebug_sectors_per & 0xff;
1203         p[12] = (scsi_debug_sector_size >> 8) & 0xff;
1204         p[13] = scsi_debug_sector_size & 0xff;
1205         if (DEV_REMOVEABLE(target))
1206                 p[20] |= 0x20; /* should agree with INQUIRY */
1207         if (1 == pcontrol)
1208                 memset(p + 2, 0, sizeof(format_pg) - 2);
1209         return sizeof(format_pg);
1210 }
1211
1212 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
1213 {       /* Caching page for mode_sense */
1214         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1215                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
1216
1217         memcpy(p, caching_pg, sizeof(caching_pg));
1218         if (1 == pcontrol)
1219                 memset(p + 2, 0, sizeof(caching_pg) - 2);
1220         return sizeof(caching_pg);
1221 }
1222
1223 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
1224 {       /* Control mode page for mode_sense */
1225         unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
1226                                         0, 0, 0, 0};
1227         unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1228                                      0, 0, 0x2, 0x4b};
1229
1230         if (scsi_debug_dsense)
1231                 ctrl_m_pg[2] |= 0x4;
1232         else
1233                 ctrl_m_pg[2] &= ~0x4;
1234
1235         if (scsi_debug_ato)
1236                 ctrl_m_pg[5] |= 0x80; /* ATO=1 */
1237
1238         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
1239         if (1 == pcontrol)
1240                 memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
1241         else if (2 == pcontrol)
1242                 memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
1243         return sizeof(ctrl_m_pg);
1244 }
1245
1246
1247 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
1248 {       /* Informational Exceptions control mode page for mode_sense */
1249         unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
1250                                        0, 0, 0x0, 0x0};
1251         unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1252                                       0, 0, 0x0, 0x0};
1253
1254         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
1255         if (1 == pcontrol)
1256                 memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
1257         else if (2 == pcontrol)
1258                 memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
1259         return sizeof(iec_m_pg);
1260 }
1261
1262 static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
1263 {       /* SAS SSP mode page - short format for mode_sense */
1264         unsigned char sas_sf_m_pg[] = {0x19, 0x6,
1265                 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
1266
1267         memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
1268         if (1 == pcontrol)
1269                 memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
1270         return sizeof(sas_sf_m_pg);
1271 }
1272
1273
1274 static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
1275                               int target_dev_id)
1276 {       /* SAS phy control and discover mode page for mode_sense */
1277         unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
1278                     0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
1279                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1280                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1281                     0x2, 0, 0, 0, 0, 0, 0, 0,
1282                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1283                     0, 0, 0, 0, 0, 0, 0, 0,
1284                     0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
1285                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1286                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1287                     0x3, 0, 0, 0, 0, 0, 0, 0,
1288                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1289                     0, 0, 0, 0, 0, 0, 0, 0,
1290                 };
1291         int port_a, port_b;
1292
1293         port_a = target_dev_id + 1;
1294         port_b = port_a + 1;
1295         memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
1296         p[20] = (port_a >> 24);
1297         p[21] = (port_a >> 16) & 0xff;
1298         p[22] = (port_a >> 8) & 0xff;
1299         p[23] = port_a & 0xff;
1300         p[48 + 20] = (port_b >> 24);
1301         p[48 + 21] = (port_b >> 16) & 0xff;
1302         p[48 + 22] = (port_b >> 8) & 0xff;
1303         p[48 + 23] = port_b & 0xff;
1304         if (1 == pcontrol)
1305                 memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
1306         return sizeof(sas_pcd_m_pg);
1307 }
1308
1309 static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
1310 {       /* SAS SSP shared protocol specific port mode subpage */
1311         unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
1312                     0, 0, 0, 0, 0, 0, 0, 0,
1313                 };
1314
1315         memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
1316         if (1 == pcontrol)
1317                 memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
1318         return sizeof(sas_sha_m_pg);
1319 }
1320
1321 #define SDEBUG_MAX_MSENSE_SZ 256
1322
1323 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
1324                            struct sdebug_dev_info * devip)
1325 {
1326         unsigned char dbd, llbaa;
1327         int pcontrol, pcode, subpcode, bd_len;
1328         unsigned char dev_spec;
1329         int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
1330         unsigned char * ap;
1331         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
1332         unsigned char *cmd = (unsigned char *)scp->cmnd;
1333
1334         if ((errsts = check_readiness(scp, 1, devip)))
1335                 return errsts;
1336         dbd = !!(cmd[1] & 0x8);
1337         pcontrol = (cmd[2] & 0xc0) >> 6;
1338         pcode = cmd[2] & 0x3f;
1339         subpcode = cmd[3];
1340         msense_6 = (MODE_SENSE == cmd[0]);
1341         llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
1342         if ((0 == scsi_debug_ptype) && (0 == dbd))
1343                 bd_len = llbaa ? 16 : 8;
1344         else
1345                 bd_len = 0;
1346         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
1347         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
1348         if (0x3 == pcontrol) {  /* Saving values not supported */
1349                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
1350                                 0);
1351                 return check_condition_result;
1352         }
1353         target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
1354                         (devip->target * 1000) - 3;
1355         /* set DPOFUA bit for disks */
1356         if (0 == scsi_debug_ptype)
1357                 dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
1358         else
1359                 dev_spec = 0x0;
1360         if (msense_6) {
1361                 arr[2] = dev_spec;
1362                 arr[3] = bd_len;
1363                 offset = 4;
1364         } else {
1365                 arr[3] = dev_spec;
1366                 if (16 == bd_len)
1367                         arr[4] = 0x1;   /* set LONGLBA bit */
1368                 arr[7] = bd_len;        /* assume 255 or less */
1369                 offset = 8;
1370         }
1371         ap = arr + offset;
1372         if ((bd_len > 0) && (!sdebug_capacity))
1373                 sdebug_capacity = get_sdebug_capacity();
1374
1375         if (8 == bd_len) {
1376                 if (sdebug_capacity > 0xfffffffe) {
1377                         ap[0] = 0xff;
1378                         ap[1] = 0xff;
1379                         ap[2] = 0xff;
1380                         ap[3] = 0xff;
1381                 } else {
1382                         ap[0] = (sdebug_capacity >> 24) & 0xff;
1383                         ap[1] = (sdebug_capacity >> 16) & 0xff;
1384                         ap[2] = (sdebug_capacity >> 8) & 0xff;
1385                         ap[3] = sdebug_capacity & 0xff;
1386                 }
1387                 ap[6] = (scsi_debug_sector_size >> 8) & 0xff;
1388                 ap[7] = scsi_debug_sector_size & 0xff;
1389                 offset += bd_len;
1390                 ap = arr + offset;
1391         } else if (16 == bd_len) {
1392                 unsigned long long capac = sdebug_capacity;
1393
1394                 for (k = 0; k < 8; ++k, capac >>= 8)
1395                         ap[7 - k] = capac & 0xff;
1396                 ap[12] = (scsi_debug_sector_size >> 24) & 0xff;
1397                 ap[13] = (scsi_debug_sector_size >> 16) & 0xff;
1398                 ap[14] = (scsi_debug_sector_size >> 8) & 0xff;
1399                 ap[15] = scsi_debug_sector_size & 0xff;
1400                 offset += bd_len;
1401                 ap = arr + offset;
1402         }
1403
1404         if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
1405                 /* TODO: Control Extension page */
1406                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1407                                 0);
1408                 return check_condition_result;
1409         }
1410         switch (pcode) {
1411         case 0x1:       /* Read-Write error recovery page, direct access */
1412                 len = resp_err_recov_pg(ap, pcontrol, target);
1413                 offset += len;
1414                 break;
1415         case 0x2:       /* Disconnect-Reconnect page, all devices */
1416                 len = resp_disconnect_pg(ap, pcontrol, target);
1417                 offset += len;
1418                 break;
1419         case 0x3:       /* Format device page, direct access */
1420                 len = resp_format_pg(ap, pcontrol, target);
1421                 offset += len;
1422                 break;
1423         case 0x8:       /* Caching page, direct access */
1424                 len = resp_caching_pg(ap, pcontrol, target);
1425                 offset += len;
1426                 break;
1427         case 0xa:       /* Control Mode page, all devices */
1428                 len = resp_ctrl_m_pg(ap, pcontrol, target);
1429                 offset += len;
1430                 break;
1431         case 0x19:      /* if spc==1 then sas phy, control+discover */
1432                 if ((subpcode > 0x2) && (subpcode < 0xff)) {
1433                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1434                                         INVALID_FIELD_IN_CDB, 0);
1435                         return check_condition_result;
1436                 }
1437                 len = 0;
1438                 if ((0x0 == subpcode) || (0xff == subpcode))
1439                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1440                 if ((0x1 == subpcode) || (0xff == subpcode))
1441                         len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
1442                                                   target_dev_id);
1443                 if ((0x2 == subpcode) || (0xff == subpcode))
1444                         len += resp_sas_sha_m_spg(ap + len, pcontrol);
1445                 offset += len;
1446                 break;
1447         case 0x1c:      /* Informational Exceptions Mode page, all devices */
1448                 len = resp_iec_m_pg(ap, pcontrol, target);
1449                 offset += len;
1450                 break;
1451         case 0x3f:      /* Read all Mode pages */
1452                 if ((0 == subpcode) || (0xff == subpcode)) {
1453                         len = resp_err_recov_pg(ap, pcontrol, target);
1454                         len += resp_disconnect_pg(ap + len, pcontrol, target);
1455                         len += resp_format_pg(ap + len, pcontrol, target);
1456                         len += resp_caching_pg(ap + len, pcontrol, target);
1457                         len += resp_ctrl_m_pg(ap + len, pcontrol, target);
1458                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1459                         if (0xff == subpcode) {
1460                                 len += resp_sas_pcd_m_spg(ap + len, pcontrol,
1461                                                   target, target_dev_id);
1462                                 len += resp_sas_sha_m_spg(ap + len, pcontrol);
1463                         }
1464                         len += resp_iec_m_pg(ap + len, pcontrol, target);
1465                 } else {
1466                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1467                                         INVALID_FIELD_IN_CDB, 0);
1468                         return check_condition_result;
1469                 }
1470                 offset += len;
1471                 break;
1472         default:
1473                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1474                                 0);
1475                 return check_condition_result;
1476         }
1477         if (msense_6)
1478                 arr[0] = offset - 1;
1479         else {
1480                 arr[0] = ((offset - 2) >> 8) & 0xff;
1481                 arr[1] = (offset - 2) & 0xff;
1482         }
1483         return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
1484 }
1485
1486 #define SDEBUG_MAX_MSELECT_SZ 512
1487
1488 static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
1489                             struct sdebug_dev_info * devip)
1490 {
1491         int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
1492         int param_len, res, errsts, mpage;
1493         unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
1494         unsigned char *cmd = (unsigned char *)scp->cmnd;
1495
1496         if ((errsts = check_readiness(scp, 1, devip)))
1497                 return errsts;
1498         memset(arr, 0, sizeof(arr));
1499         pf = cmd[1] & 0x10;
1500         sp = cmd[1] & 0x1;
1501         param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]);
1502         if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
1503                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1504                                 INVALID_FIELD_IN_CDB, 0);
1505                 return check_condition_result;
1506         }
1507         res = fetch_to_dev_buffer(scp, arr, param_len);
1508         if (-1 == res)
1509                 return (DID_ERROR << 16);
1510         else if ((res < param_len) &&
1511                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
1512                 printk(KERN_INFO "scsi_debug: mode_select: cdb indicated=%d, "
1513                        " IO sent=%d bytes\n", param_len, res);
1514         md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);
1515         bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);
1516         if (md_len > 2) {
1517                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1518                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1519                 return check_condition_result;
1520         }
1521         off = bd_len + (mselect6 ? 4 : 8);
1522         mpage = arr[off] & 0x3f;
1523         ps = !!(arr[off] & 0x80);
1524         if (ps) {
1525                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1526                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1527                 return check_condition_result;
1528         }
1529         spf = !!(arr[off] & 0x40);
1530         pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) :
1531                        (arr[off + 1] + 2);
1532         if ((pg_len + off) > param_len) {
1533                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1534                                 PARAMETER_LIST_LENGTH_ERR, 0);
1535                 return check_condition_result;
1536         }
1537         switch (mpage) {
1538         case 0xa:      /* Control Mode page */
1539                 if (ctrl_m_pg[1] == arr[off + 1]) {
1540                         memcpy(ctrl_m_pg + 2, arr + off + 2,
1541                                sizeof(ctrl_m_pg) - 2);
1542                         scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4);
1543                         return 0;
1544                 }
1545                 break;
1546         case 0x1c:      /* Informational Exceptions Mode page */
1547                 if (iec_m_pg[1] == arr[off + 1]) {
1548                         memcpy(iec_m_pg + 2, arr + off + 2,
1549                                sizeof(iec_m_pg) - 2);
1550                         return 0;
1551                 }
1552                 break;
1553         default:
1554                 break;
1555         }
1556         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1557                         INVALID_FIELD_IN_PARAM_LIST, 0);
1558         return check_condition_result;
1559 }
1560
1561 static int resp_temp_l_pg(unsigned char * arr)
1562 {
1563         unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
1564                                      0x0, 0x1, 0x3, 0x2, 0x0, 65,
1565                 };
1566
1567         memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
1568         return sizeof(temp_l_pg);
1569 }
1570
1571 static int resp_ie_l_pg(unsigned char * arr)
1572 {
1573         unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
1574                 };
1575
1576         memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
1577         if (iec_m_pg[2] & 0x4) {        /* TEST bit set */
1578                 arr[4] = THRESHOLD_EXCEEDED;
1579                 arr[5] = 0xff;
1580         }
1581         return sizeof(ie_l_pg);
1582 }
1583
1584 #define SDEBUG_MAX_LSENSE_SZ 512
1585
1586 static int resp_log_sense(struct scsi_cmnd * scp,
1587                           struct sdebug_dev_info * devip)
1588 {
1589         int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;
1590         unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
1591         unsigned char *cmd = (unsigned char *)scp->cmnd;
1592
1593         if ((errsts = check_readiness(scp, 1, devip)))
1594                 return errsts;
1595         memset(arr, 0, sizeof(arr));
1596         ppc = cmd[1] & 0x2;
1597         sp = cmd[1] & 0x1;
1598         if (ppc || sp) {
1599                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1600                                 INVALID_FIELD_IN_CDB, 0);
1601                 return check_condition_result;
1602         }
1603         pcontrol = (cmd[2] & 0xc0) >> 6;
1604         pcode = cmd[2] & 0x3f;
1605         subpcode = cmd[3] & 0xff;
1606         alloc_len = (cmd[7] << 8) + cmd[8];
1607         arr[0] = pcode;
1608         if (0 == subpcode) {
1609                 switch (pcode) {
1610                 case 0x0:       /* Supported log pages log page */
1611                         n = 4;
1612                         arr[n++] = 0x0;         /* this page */
1613                         arr[n++] = 0xd;         /* Temperature */
1614                         arr[n++] = 0x2f;        /* Informational exceptions */
1615                         arr[3] = n - 4;
1616                         break;
1617                 case 0xd:       /* Temperature log page */
1618                         arr[3] = resp_temp_l_pg(arr + 4);
1619                         break;
1620                 case 0x2f:      /* Informational exceptions log page */
1621                         arr[3] = resp_ie_l_pg(arr + 4);
1622                         break;
1623                 default:
1624                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1625                                         INVALID_FIELD_IN_CDB, 0);
1626                         return check_condition_result;
1627                 }
1628         } else if (0xff == subpcode) {
1629                 arr[0] |= 0x40;
1630                 arr[1] = subpcode;
1631                 switch (pcode) {
1632                 case 0x0:       /* Supported log pages and subpages log page */
1633                         n = 4;
1634                         arr[n++] = 0x0;
1635                         arr[n++] = 0x0;         /* 0,0 page */
1636                         arr[n++] = 0x0;
1637                         arr[n++] = 0xff;        /* this page */
1638                         arr[n++] = 0xd;
1639                         arr[n++] = 0x0;         /* Temperature */
1640                         arr[n++] = 0x2f;
1641                         arr[n++] = 0x0; /* Informational exceptions */
1642                         arr[3] = n - 4;
1643                         break;
1644                 case 0xd:       /* Temperature subpages */
1645                         n = 4;
1646                         arr[n++] = 0xd;
1647                         arr[n++] = 0x0;         /* Temperature */
1648                         arr[3] = n - 4;
1649                         break;
1650                 case 0x2f:      /* Informational exceptions subpages */
1651                         n = 4;
1652                         arr[n++] = 0x2f;
1653                         arr[n++] = 0x0;         /* Informational exceptions */
1654                         arr[3] = n - 4;
1655                         break;
1656                 default:
1657                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1658                                         INVALID_FIELD_IN_CDB, 0);
1659                         return check_condition_result;
1660                 }
1661         } else {
1662                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1663                                 INVALID_FIELD_IN_CDB, 0);
1664                 return check_condition_result;
1665         }
1666         len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
1667         return fill_from_dev_buffer(scp, arr,
1668                     min(len, SDEBUG_MAX_INQ_ARR_SZ));
1669 }
1670
1671 static int check_device_access_params(struct sdebug_dev_info *devi,
1672                                       unsigned long long lba, unsigned int num)
1673 {
1674         if (lba + num > sdebug_capacity) {
1675                 mk_sense_buffer(devi, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0);
1676                 return check_condition_result;
1677         }
1678         /* transfer length excessive (tie in to block limits VPD page) */
1679         if (num > sdebug_store_sectors) {
1680                 mk_sense_buffer(devi, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
1681                 return check_condition_result;
1682         }
1683         return 0;
1684 }
1685
1686 static int do_device_access(struct scsi_cmnd *scmd,
1687                             struct sdebug_dev_info *devi,
1688                             unsigned long long lba, unsigned int num, int write)
1689 {
1690         int ret;
1691         unsigned long long block, rest = 0;
1692         int (*func)(struct scsi_cmnd *, unsigned char *, int);
1693
1694         func = write ? fetch_to_dev_buffer : fill_from_dev_buffer;
1695
1696         block = do_div(lba, sdebug_store_sectors);
1697         if (block + num > sdebug_store_sectors)
1698                 rest = block + num - sdebug_store_sectors;
1699
1700         ret = func(scmd, fake_storep + (block * scsi_debug_sector_size),
1701                    (num - rest) * scsi_debug_sector_size);
1702         if (!ret && rest)
1703                 ret = func(scmd, fake_storep, rest * scsi_debug_sector_size);
1704
1705         return ret;
1706 }
1707
1708 static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
1709                             unsigned int sectors, u32 ei_lba)
1710 {
1711         unsigned int i, resid;
1712         struct scatterlist *psgl;
1713         struct sd_dif_tuple *sdt;
1714         sector_t sector;
1715         sector_t tmp_sec = start_sec;
1716         void *paddr;
1717
1718         start_sec = do_div(tmp_sec, sdebug_store_sectors);
1719
1720         sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
1721
1722         for (i = 0 ; i < sectors ; i++) {
1723                 u16 csum;
1724
1725                 if (sdt[i].app_tag == 0xffff)
1726                         continue;
1727
1728                 sector = start_sec + i;
1729
1730                 switch (scsi_debug_guard) {
1731                 case 1:
1732                         csum = ip_compute_csum(fake_storep +
1733                                                sector * scsi_debug_sector_size,
1734                                                scsi_debug_sector_size);
1735                         break;
1736                 case 0:
1737                         csum = crc_t10dif(fake_storep +
1738                                           sector * scsi_debug_sector_size,
1739                                           scsi_debug_sector_size);
1740                         csum = cpu_to_be16(csum);
1741                         break;
1742                 default:
1743                         BUG();
1744                 }
1745
1746                 if (sdt[i].guard_tag != csum) {
1747                         printk(KERN_ERR "%s: GUARD check failed on sector %lu" \
1748                                " rcvd 0x%04x, data 0x%04x\n", __func__,
1749                                (unsigned long)sector,
1750                                be16_to_cpu(sdt[i].guard_tag),
1751                                be16_to_cpu(csum));
1752                         dif_errors++;
1753                         return 0x01;
1754                 }
1755
1756                 if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1757                     be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) {
1758                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1759                                __func__, (unsigned long)sector);
1760                         dif_errors++;
1761                         return 0x03;
1762                 }
1763
1764                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1765                     be32_to_cpu(sdt[i].ref_tag) != ei_lba) {
1766                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1767                                __func__, (unsigned long)sector);
1768                         dif_errors++;
1769                         return 0x03;
1770                 }
1771
1772                 ei_lba++;
1773         }
1774
1775         resid = sectors * 8; /* Bytes of protection data to copy into sgl */
1776         sector = start_sec;
1777
1778         scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
1779                 int len = min(psgl->length, resid);
1780
1781                 paddr = kmap_atomic(sg_page(psgl), KM_IRQ0) + psgl->offset;
1782                 memcpy(paddr, dif_storep + dif_offset(sector), len);
1783
1784                 sector += len >> 3;
1785                 if (sector >= sdebug_store_sectors) {
1786                         /* Force wrap */
1787                         tmp_sec = sector;
1788                         sector = do_div(tmp_sec, sdebug_store_sectors);
1789                 }
1790                 resid -= len;
1791                 kunmap_atomic(paddr, KM_IRQ0);
1792         }
1793
1794         dix_reads++;
1795
1796         return 0;
1797 }
1798
1799 static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
1800                      unsigned int num, struct sdebug_dev_info *devip,
1801                      u32 ei_lba)
1802 {
1803         unsigned long iflags;
1804         int ret;
1805
1806         ret = check_device_access_params(devip, lba, num);
1807         if (ret)
1808                 return ret;
1809
1810         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
1811             (lba <= (OPT_MEDIUM_ERR_ADDR + OPT_MEDIUM_ERR_NUM - 1)) &&
1812             ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
1813                 /* claim unrecoverable read error */
1814                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR, 0);
1815                 /* set info field and valid bit for fixed descriptor */
1816                 if (0x70 == (devip->sense_buff[0] & 0x7f)) {
1817                         devip->sense_buff[0] |= 0x80;   /* Valid bit */
1818                         ret = (lba < OPT_MEDIUM_ERR_ADDR)
1819                               ? OPT_MEDIUM_ERR_ADDR : (int)lba;
1820                         devip->sense_buff[3] = (ret >> 24) & 0xff;
1821                         devip->sense_buff[4] = (ret >> 16) & 0xff;
1822                         devip->sense_buff[5] = (ret >> 8) & 0xff;
1823                         devip->sense_buff[6] = ret & 0xff;
1824                 }
1825                 scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
1826                 return check_condition_result;
1827         }
1828
1829         /* DIX + T10 DIF */
1830         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
1831                 int prot_ret = prot_verify_read(SCpnt, lba, num, ei_lba);
1832
1833                 if (prot_ret) {
1834                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, prot_ret);
1835                         return illegal_condition_result;
1836                 }
1837         }
1838
1839         read_lock_irqsave(&atomic_rw, iflags);
1840         ret = do_device_access(SCpnt, devip, lba, num, 0);
1841         read_unlock_irqrestore(&atomic_rw, iflags);
1842         return ret;
1843 }
1844
1845 void dump_sector(unsigned char *buf, int len)
1846 {
1847         int i, j;
1848
1849         printk(KERN_ERR ">>> Sector Dump <<<\n");
1850
1851         for (i = 0 ; i < len ; i += 16) {
1852                 printk(KERN_ERR "%04d: ", i);
1853
1854                 for (j = 0 ; j < 16 ; j++) {
1855                         unsigned char c = buf[i+j];
1856                         if (c >= 0x20 && c < 0x7e)
1857                                 printk(" %c ", buf[i+j]);
1858                         else
1859                                 printk("%02x ", buf[i+j]);
1860                 }
1861
1862                 printk("\n");
1863         }
1864 }
1865
1866 static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
1867                              unsigned int sectors, u32 ei_lba)
1868 {
1869         int i, j, ret;
1870         struct sd_dif_tuple *sdt;
1871         struct scatterlist *dsgl = scsi_sglist(SCpnt);
1872         struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
1873         void *daddr, *paddr;
1874         sector_t tmp_sec = start_sec;
1875         sector_t sector;
1876         int ppage_offset;
1877         unsigned short csum;
1878
1879         sector = do_div(tmp_sec, sdebug_store_sectors);
1880
1881         BUG_ON(scsi_sg_count(SCpnt) == 0);
1882         BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
1883
1884         paddr = kmap_atomic(sg_page(psgl), KM_IRQ1) + psgl->offset;
1885         ppage_offset = 0;
1886
1887         /* For each data page */
1888         scsi_for_each_sg(SCpnt, dsgl, scsi_sg_count(SCpnt), i) {
1889                 daddr = kmap_atomic(sg_page(dsgl), KM_IRQ0) + dsgl->offset;
1890
1891                 /* For each sector-sized chunk in data page */
1892                 for (j = 0 ; j < dsgl->length ; j += scsi_debug_sector_size) {
1893
1894                         /* If we're at the end of the current
1895                          * protection page advance to the next one
1896                          */
1897                         if (ppage_offset >= psgl->length) {
1898                                 kunmap_atomic(paddr, KM_IRQ1);
1899                                 psgl = sg_next(psgl);
1900                                 BUG_ON(psgl == NULL);
1901                                 paddr = kmap_atomic(sg_page(psgl), KM_IRQ1)
1902                                         + psgl->offset;
1903                                 ppage_offset = 0;
1904                         }
1905
1906                         sdt = paddr + ppage_offset;
1907
1908                         switch (scsi_debug_guard) {
1909                         case 1:
1910                                 csum = ip_compute_csum(daddr,
1911                                                        scsi_debug_sector_size);
1912                                 break;
1913                         case 0:
1914                                 csum = cpu_to_be16(crc_t10dif(daddr,
1915                                                       scsi_debug_sector_size));
1916                                 break;
1917                         default:
1918                                 BUG();
1919                                 ret = 0;
1920                                 goto out;
1921                         }
1922
1923                         if (sdt->guard_tag != csum) {
1924                                 printk(KERN_ERR
1925                                        "%s: GUARD check failed on sector %lu " \
1926                                        "rcvd 0x%04x, calculated 0x%04x\n",
1927                                        __func__, (unsigned long)sector,
1928                                        be16_to_cpu(sdt->guard_tag),
1929                                        be16_to_cpu(csum));
1930                                 ret = 0x01;
1931                                 dump_sector(daddr, scsi_debug_sector_size);
1932                                 goto out;
1933                         }
1934
1935                         if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1936                             be32_to_cpu(sdt->ref_tag)
1937                             != (start_sec & 0xffffffff)) {
1938                                 printk(KERN_ERR
1939                                        "%s: REF check failed on sector %lu\n",
1940                                        __func__, (unsigned long)sector);
1941                                 ret = 0x03;
1942                                 dump_sector(daddr, scsi_debug_sector_size);
1943                                 goto out;
1944                         }
1945
1946                         if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1947                             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1948                                 printk(KERN_ERR
1949                                        "%s: REF check failed on sector %lu\n",
1950                                        __func__, (unsigned long)sector);
1951                                 ret = 0x03;
1952                                 dump_sector(daddr, scsi_debug_sector_size);
1953                                 goto out;
1954                         }
1955
1956                         /* Would be great to copy this in bigger
1957                          * chunks.  However, for the sake of
1958                          * correctness we need to verify each sector
1959                          * before writing it to "stable" storage
1960                          */
1961                         memcpy(dif_storep + dif_offset(sector), sdt, 8);
1962
1963                         sector++;
1964
1965                         if (sector == sdebug_store_sectors)
1966                                 sector = 0;     /* Force wrap */
1967
1968                         start_sec++;
1969                         ei_lba++;
1970                         daddr += scsi_debug_sector_size;
1971                         ppage_offset += sizeof(struct sd_dif_tuple);
1972                 }
1973
1974                 kunmap_atomic(daddr, KM_IRQ0);
1975         }
1976
1977         kunmap_atomic(paddr, KM_IRQ1);
1978
1979         dix_writes++;
1980
1981         return 0;
1982
1983 out:
1984         dif_errors++;
1985         kunmap_atomic(daddr, KM_IRQ0);
1986         kunmap_atomic(paddr, KM_IRQ1);
1987         return ret;
1988 }
1989
1990 static unsigned int map_state(sector_t lba, unsigned int *num)
1991 {
1992         unsigned int granularity, alignment, mapped;
1993         sector_t block, next, end;
1994
1995         granularity = scsi_debug_unmap_granularity;
1996         alignment = granularity - scsi_debug_unmap_alignment;
1997         block = lba + alignment;
1998         do_div(block, granularity);
1999
2000         mapped = test_bit(block, map_storep);
2001
2002         if (mapped)
2003                 next = find_next_zero_bit(map_storep, map_size, block);
2004         else
2005                 next = find_next_bit(map_storep, map_size, block);
2006
2007         end = next * granularity - scsi_debug_unmap_alignment;
2008         *num = end - lba;
2009
2010         return mapped;
2011 }
2012
2013 static void map_region(sector_t lba, unsigned int len)
2014 {
2015         unsigned int granularity, alignment;
2016         sector_t end = lba + len;
2017
2018         granularity = scsi_debug_unmap_granularity;
2019         alignment = granularity - scsi_debug_unmap_alignment;
2020
2021         while (lba < end) {
2022                 sector_t block, rem;
2023
2024                 block = lba + alignment;
2025                 rem = do_div(block, granularity);
2026
2027                 if (block < map_size)
2028                         set_bit(block, map_storep);
2029
2030                 lba += granularity - rem;
2031         }
2032 }
2033
2034 static void unmap_region(sector_t lba, unsigned int len)
2035 {
2036         unsigned int granularity, alignment;
2037         sector_t end = lba + len;
2038
2039         granularity = scsi_debug_unmap_granularity;
2040         alignment = granularity - scsi_debug_unmap_alignment;
2041
2042         while (lba < end) {
2043                 sector_t block, rem;
2044
2045                 block = lba + alignment;
2046                 rem = do_div(block, granularity);
2047
2048                 if (rem == 0 && lba + granularity <= end &&
2049                     block < map_size)
2050                         clear_bit(block, map_storep);
2051
2052                 lba += granularity - rem;
2053         }
2054 }
2055
2056 static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
2057                       unsigned int num, struct sdebug_dev_info *devip,
2058                       u32 ei_lba)
2059 {
2060         unsigned long iflags;
2061         int ret;
2062
2063         ret = check_device_access_params(devip, lba, num);
2064         if (ret)
2065                 return ret;
2066
2067         /* DIX + T10 DIF */
2068         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
2069                 int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
2070
2071                 if (prot_ret) {
2072                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
2073                         return illegal_condition_result;
2074                 }
2075         }
2076
2077         write_lock_irqsave(&atomic_rw, iflags);
2078         ret = do_device_access(SCpnt, devip, lba, num, 1);
2079         if (scsi_debug_unmap_granularity)
2080                 map_region(lba, num);
2081         write_unlock_irqrestore(&atomic_rw, iflags);
2082         if (-1 == ret)
2083                 return (DID_ERROR << 16);
2084         else if ((ret < (num * scsi_debug_sector_size)) &&
2085                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2086                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
2087                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2088
2089         return 0;
2090 }
2091
2092 static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
2093                       unsigned int num, struct sdebug_dev_info *devip,
2094                            u32 ei_lba, unsigned int unmap)
2095 {
2096         unsigned long iflags;
2097         unsigned long long i;
2098         int ret;
2099
2100         ret = check_device_access_params(devip, lba, num);
2101         if (ret)
2102                 return ret;
2103
2104         if (num > scsi_debug_write_same_length) {
2105                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2106                                 0);
2107                 return check_condition_result;
2108         }
2109
2110         write_lock_irqsave(&atomic_rw, iflags);
2111
2112         if (unmap && scsi_debug_unmap_granularity) {
2113                 unmap_region(lba, num);
2114                 goto out;
2115         }
2116
2117         /* Else fetch one logical block */
2118         ret = fetch_to_dev_buffer(scmd,
2119                                   fake_storep + (lba * scsi_debug_sector_size),
2120                                   scsi_debug_sector_size);
2121
2122         if (-1 == ret) {
2123                 write_unlock_irqrestore(&atomic_rw, iflags);
2124                 return (DID_ERROR << 16);
2125         } else if ((ret < (num * scsi_debug_sector_size)) &&
2126                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2127                 printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
2128                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2129
2130         /* Copy first sector to remaining blocks */
2131         for (i = 1 ; i < num ; i++)
2132                 memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
2133                        fake_storep + (lba * scsi_debug_sector_size),
2134                        scsi_debug_sector_size);
2135
2136         if (scsi_debug_unmap_granularity)
2137                 map_region(lba, num);
2138 out:
2139         write_unlock_irqrestore(&atomic_rw, iflags);
2140
2141         return 0;
2142 }
2143
2144 struct unmap_block_desc {
2145         __be64  lba;
2146         __be32  blocks;
2147         __be32  __reserved;
2148 };
2149
2150 static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
2151 {
2152         unsigned char *buf;
2153         struct unmap_block_desc *desc;
2154         unsigned int i, payload_len, descriptors;
2155         int ret;
2156
2157         ret = check_readiness(scmd, 1, devip);
2158         if (ret)
2159                 return ret;
2160
2161         payload_len = get_unaligned_be16(&scmd->cmnd[7]);
2162         BUG_ON(scsi_bufflen(scmd) != payload_len);
2163
2164         descriptors = (payload_len - 8) / 16;
2165
2166         buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
2167         if (!buf)
2168                 return check_condition_result;
2169
2170         scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
2171
2172         BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
2173         BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
2174
2175         desc = (void *)&buf[8];
2176
2177         for (i = 0 ; i < descriptors ; i++) {
2178                 unsigned long long lba = get_unaligned_be64(&desc[i].lba);
2179                 unsigned int num = get_unaligned_be32(&desc[i].blocks);
2180
2181                 ret = check_device_access_params(devip, lba, num);
2182                 if (ret)
2183                         goto out;
2184
2185                 unmap_region(lba, num);
2186         }
2187
2188         ret = 0;
2189
2190 out:
2191         kfree(buf);
2192
2193         return ret;
2194 }
2195
2196 #define SDEBUG_GET_LBA_STATUS_LEN 32
2197
2198 static int resp_get_lba_status(struct scsi_cmnd * scmd,
2199                                struct sdebug_dev_info * devip)
2200 {
2201         unsigned long long lba;
2202         unsigned int alloc_len, mapped, num;
2203         unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
2204         int ret;
2205
2206         ret = check_readiness(scmd, 1, devip);
2207         if (ret)
2208                 return ret;
2209
2210         lba = get_unaligned_be64(&scmd->cmnd[2]);
2211         alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
2212
2213         if (alloc_len < 24)
2214                 return 0;
2215
2216         ret = check_device_access_params(devip, lba, 1);
2217         if (ret)
2218                 return ret;
2219
2220         mapped = map_state(lba, &num);
2221
2222         memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
2223         put_unaligned_be32(16, &arr[0]);        /* Parameter Data Length */
2224         put_unaligned_be64(lba, &arr[8]);       /* LBA */
2225         put_unaligned_be32(num, &arr[16]);      /* Number of blocks */
2226         arr[20] = !mapped;                      /* mapped = 0, unmapped = 1 */
2227
2228         return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
2229 }
2230
2231 #define SDEBUG_RLUN_ARR_SZ 256
2232
2233 static int resp_report_luns(struct scsi_cmnd * scp,
2234                             struct sdebug_dev_info * devip)
2235 {
2236         unsigned int alloc_len;
2237         int lun_cnt, i, upper, num, n, wlun, lun;
2238         unsigned char *cmd = (unsigned char *)scp->cmnd;
2239         int select_report = (int)cmd[2];
2240         struct scsi_lun *one_lun;
2241         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
2242         unsigned char * max_addr;
2243
2244         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
2245         if ((alloc_len < 4) || (select_report > 2)) {
2246                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2247                                 0);
2248                 return check_condition_result;
2249         }
2250         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
2251         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
2252         lun_cnt = scsi_debug_max_luns;
2253         if (1 == select_report)
2254                 lun_cnt = 0;
2255         else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
2256                 --lun_cnt;
2257         wlun = (select_report > 0) ? 1 : 0;
2258         num = lun_cnt + wlun;
2259         arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
2260         arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
2261         n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
2262                             sizeof(struct scsi_lun)), num);
2263         if (n < num) {
2264                 wlun = 0;
2265                 lun_cnt = n;
2266         }
2267         one_lun = (struct scsi_lun *) &arr[8];
2268         max_addr = arr + SDEBUG_RLUN_ARR_SZ;
2269         for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
2270              ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
2271              i++, lun++) {
2272                 upper = (lun >> 8) & 0x3f;
2273                 if (upper)
2274                         one_lun[i].scsi_lun[0] =
2275                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
2276                 one_lun[i].scsi_lun[1] = lun & 0xff;
2277         }
2278         if (wlun) {
2279                 one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
2280                 one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
2281                 i++;
2282         }
2283         alloc_len = (unsigned char *)(one_lun + i) - arr;
2284         return fill_from_dev_buffer(scp, arr,
2285                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
2286 }
2287
2288 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
2289                             unsigned int num, struct sdebug_dev_info *devip)
2290 {
2291         int i, j, ret = -1;
2292         unsigned char *kaddr, *buf;
2293         unsigned int offset;
2294         struct scatterlist *sg;
2295         struct scsi_data_buffer *sdb = scsi_in(scp);
2296
2297         /* better not to use temporary buffer. */
2298         buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
2299         if (!buf)
2300                 return ret;
2301
2302         scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
2303
2304         offset = 0;
2305         for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
2306                 kaddr = (unsigned char *)kmap_atomic(sg_page(sg), KM_USER0);
2307                 if (!kaddr)
2308                         goto out;
2309
2310                 for (j = 0; j < sg->length; j++)
2311                         *(kaddr + sg->offset + j) ^= *(buf + offset + j);
2312
2313                 offset += sg->length;
2314                 kunmap_atomic(kaddr, KM_USER0);
2315         }
2316         ret = 0;
2317 out:
2318         kfree(buf);
2319
2320         return ret;
2321 }
2322
2323 /* When timer goes off this function is called. */
2324 static void timer_intr_handler(unsigned long indx)
2325 {
2326         struct sdebug_queued_cmd * sqcp;
2327         unsigned long iflags;
2328
2329         if (indx >= scsi_debug_max_queue) {
2330                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
2331                        "large\n");
2332                 return;
2333         }
2334         spin_lock_irqsave(&queued_arr_lock, iflags);
2335         sqcp = &queued_arr[(int)indx];
2336         if (! sqcp->in_use) {
2337                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
2338                        "interrupt\n");
2339                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2340                 return;
2341         }
2342         sqcp->in_use = 0;
2343         if (sqcp->done_funct) {
2344                 sqcp->a_cmnd->result = sqcp->scsi_result;
2345                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
2346         }
2347         sqcp->done_funct = NULL;
2348         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2349 }
2350
2351
2352 static struct sdebug_dev_info *
2353 sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
2354 {
2355         struct sdebug_dev_info *devip;
2356
2357         devip = kzalloc(sizeof(*devip), flags);
2358         if (devip) {
2359                 devip->sdbg_host = sdbg_host;
2360                 list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
2361         }
2362         return devip;
2363 }
2364
2365 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
2366 {
2367         struct sdebug_host_info * sdbg_host;
2368         struct sdebug_dev_info * open_devip = NULL;
2369         struct sdebug_dev_info * devip =
2370                         (struct sdebug_dev_info *)sdev->hostdata;
2371
2372         if (devip)
2373                 return devip;
2374         sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
2375         if (!sdbg_host) {
2376                 printk(KERN_ERR "Host info NULL\n");
2377                 return NULL;
2378         }
2379         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
2380                 if ((devip->used) && (devip->channel == sdev->channel) &&
2381                     (devip->target == sdev->id) &&
2382                     (devip->lun == sdev->lun))
2383                         return devip;
2384                 else {
2385                         if ((!devip->used) && (!open_devip))
2386                                 open_devip = devip;
2387                 }
2388         }
2389         if (!open_devip) { /* try and make a new one */
2390                 open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
2391                 if (!open_devip) {
2392                         printk(KERN_ERR "%s: out of memory at line %d\n",
2393                                 __func__, __LINE__);
2394                         return NULL;
2395                 }
2396         }
2397
2398         open_devip->channel = sdev->channel;
2399         open_devip->target = sdev->id;
2400         open_devip->lun = sdev->lun;
2401         open_devip->sdbg_host = sdbg_host;
2402         open_devip->reset = 1;
2403         open_devip->used = 1;
2404         memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
2405         if (scsi_debug_dsense)
2406                 open_devip->sense_buff[0] = 0x72;
2407         else {
2408                 open_devip->sense_buff[0] = 0x70;
2409                 open_devip->sense_buff[7] = 0xa;
2410         }
2411         if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
2412                 open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
2413
2414         return open_devip;
2415 }
2416
2417 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
2418 {
2419         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2420                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
2421                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2422         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
2423         return 0;
2424 }
2425
2426 static int scsi_debug_slave_configure(struct scsi_device *sdp)
2427 {
2428         struct sdebug_dev_info *devip;
2429
2430         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2431                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
2432                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2433         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
2434                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
2435         devip = devInfoReg(sdp);
2436         if (NULL == devip)
2437                 return 1;       /* no resources, will be marked offline */
2438         sdp->hostdata = devip;
2439         if (sdp->host->cmd_per_lun)
2440                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
2441                                         sdp->host->cmd_per_lun);
2442         blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
2443         if (scsi_debug_no_uld)
2444                 sdp->no_uld_attach = 1;
2445         return 0;
2446 }
2447
2448 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
2449 {
2450         struct sdebug_dev_info *devip =
2451                 (struct sdebug_dev_info *)sdp->hostdata;
2452
2453         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2454                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
2455                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2456         if (devip) {
2457                 /* make this slot avaliable for re-use */
2458                 devip->used = 0;
2459                 sdp->hostdata = NULL;
2460         }
2461 }
2462
2463 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
2464 static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
2465 {
2466         unsigned long iflags;
2467         int k;
2468         struct sdebug_queued_cmd *sqcp;
2469
2470         spin_lock_irqsave(&queued_arr_lock, iflags);
2471         for (k = 0; k < scsi_debug_max_queue; ++k) {
2472                 sqcp = &queued_arr[k];
2473                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
2474                         del_timer_sync(&sqcp->cmnd_timer);
2475                         sqcp->in_use = 0;
2476                         sqcp->a_cmnd = NULL;
2477                         break;
2478                 }
2479         }
2480         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2481         return (k < scsi_debug_max_queue) ? 1 : 0;
2482 }
2483
2484 /* Deletes (stops) timers of all queued commands */
2485 static void stop_all_queued(void)
2486 {
2487         unsigned long iflags;
2488         int k;
2489         struct sdebug_queued_cmd *sqcp;
2490
2491         spin_lock_irqsave(&queued_arr_lock, iflags);
2492         for (k = 0; k < scsi_debug_max_queue; ++k) {
2493                 sqcp = &queued_arr[k];
2494                 if (sqcp->in_use && sqcp->a_cmnd) {
2495                         del_timer_sync(&sqcp->cmnd_timer);
2496                         sqcp->in_use = 0;
2497                         sqcp->a_cmnd = NULL;
2498                 }
2499         }
2500         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2501 }
2502
2503 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
2504 {
2505         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2506                 printk(KERN_INFO "scsi_debug: abort\n");
2507         ++num_aborts;
2508         stop_queued_cmnd(SCpnt);
2509         return SUCCESS;
2510 }
2511
2512 static int scsi_debug_biosparam(struct scsi_device *sdev,
2513                 struct block_device * bdev, sector_t capacity, int *info)
2514 {
2515         int res;
2516         unsigned char *buf;
2517
2518         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2519                 printk(KERN_INFO "scsi_debug: biosparam\n");
2520         buf = scsi_bios_ptable(bdev);
2521         if (buf) {
2522                 res = scsi_partsize(buf, capacity,
2523                                     &info[2], &info[0], &info[1]);
2524                 kfree(buf);
2525                 if (! res)
2526                         return res;
2527         }
2528         info[0] = sdebug_heads;
2529         info[1] = sdebug_sectors_per;
2530         info[2] = sdebug_cylinders_per;
2531         return 0;
2532 }
2533
2534 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
2535 {
2536         struct sdebug_dev_info * devip;
2537
2538         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2539                 printk(KERN_INFO "scsi_debug: device_reset\n");
2540         ++num_dev_resets;
2541         if (SCpnt) {
2542                 devip = devInfoReg(SCpnt->device);
2543                 if (devip)
2544                         devip->reset = 1;
2545         }
2546         return SUCCESS;
2547 }
2548
2549 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
2550 {
2551         struct sdebug_host_info *sdbg_host;
2552         struct sdebug_dev_info * dev_info;
2553         struct scsi_device * sdp;
2554         struct Scsi_Host * hp;
2555
2556         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2557                 printk(KERN_INFO "scsi_debug: bus_reset\n");
2558         ++num_bus_resets;
2559         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
2560                 sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
2561                 if (sdbg_host) {
2562                         list_for_each_entry(dev_info,
2563                                             &sdbg_host->dev_info_list,
2564                                             dev_list)
2565                                 dev_info->reset = 1;
2566                 }
2567         }
2568         return SUCCESS;
2569 }
2570
2571 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
2572 {
2573         struct sdebug_host_info * sdbg_host;
2574         struct sdebug_dev_info * dev_info;
2575
2576         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2577                 printk(KERN_INFO "scsi_debug: host_reset\n");
2578         ++num_host_resets;
2579         spin_lock(&sdebug_host_list_lock);
2580         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
2581                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
2582                                     dev_list)
2583                         dev_info->reset = 1;
2584         }
2585         spin_unlock(&sdebug_host_list_lock);
2586         stop_all_queued();
2587         return SUCCESS;
2588 }
2589
2590 /* Initializes timers in queued array */
2591 static void __init init_all_queued(void)
2592 {
2593         unsigned long iflags;
2594         int k;
2595         struct sdebug_queued_cmd * sqcp;
2596
2597         spin_lock_irqsave(&queued_arr_lock, iflags);
2598         for (k = 0; k < scsi_debug_max_queue; ++k) {
2599                 sqcp = &queued_arr[k];
2600                 init_timer(&sqcp->cmnd_timer);
2601                 sqcp->in_use = 0;
2602                 sqcp->a_cmnd = NULL;
2603         }
2604         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2605 }
2606
2607 static void __init sdebug_build_parts(unsigned char *ramp,
2608                                       unsigned long store_size)
2609 {
2610         struct partition * pp;
2611         int starts[SDEBUG_MAX_PARTS + 2];
2612         int sectors_per_part, num_sectors, k;
2613         int heads_by_sects, start_sec, end_sec;
2614
2615         /* assume partition table already zeroed */
2616         if ((scsi_debug_num_parts < 1) || (store_size < 1048576))
2617                 return;
2618         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
2619                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
2620                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
2621                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
2622         }
2623         num_sectors = (int)sdebug_store_sectors;
2624         sectors_per_part = (num_sectors - sdebug_sectors_per)
2625                            / scsi_debug_num_parts;
2626         heads_by_sects = sdebug_heads * sdebug_sectors_per;
2627         starts[0] = sdebug_sectors_per;
2628         for (k = 1; k < scsi_debug_num_parts; ++k)
2629                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
2630                             * heads_by_sects;
2631         starts[scsi_debug_num_parts] = num_sectors;
2632         starts[scsi_debug_num_parts + 1] = 0;
2633
2634         ramp[510] = 0x55;       /* magic partition markings */
2635         ramp[511] = 0xAA;
2636         pp = (struct partition *)(ramp + 0x1be);
2637         for (k = 0; starts[k + 1]; ++k, ++pp) {
2638                 start_sec = starts[k];
2639                 end_sec = starts[k + 1] - 1;
2640                 pp->boot_ind = 0;
2641
2642                 pp->cyl = start_sec / heads_by_sects;
2643                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
2644                            / sdebug_sectors_per;
2645                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
2646
2647                 pp->end_cyl = end_sec / heads_by_sects;
2648                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
2649                                / sdebug_sectors_per;
2650                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
2651
2652                 pp->start_sect = start_sec;
2653                 pp->nr_sects = end_sec - start_sec + 1;
2654                 pp->sys_ind = 0x83;     /* plain Linux partition */
2655         }
2656 }
2657
2658 static int schedule_resp(struct scsi_cmnd * cmnd,
2659                          struct sdebug_dev_info * devip,
2660                          done_funct_t done, int scsi_result, int delta_jiff)
2661 {
2662         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
2663                 if (scsi_result) {
2664                         struct scsi_device * sdp = cmnd->device;
2665
2666                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
2667                                "non-zero result=0x%x\n", sdp->host->host_no,
2668                                sdp->channel, sdp->id, sdp->lun, scsi_result);
2669                 }
2670         }
2671         if (cmnd && devip) {
2672                 /* simulate autosense by this driver */
2673                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
2674                         memcpy(cmnd->sense_buffer, devip->sense_buff,
2675                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
2676                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
2677         }
2678         if (delta_jiff <= 0) {
2679                 if (cmnd)
2680                         cmnd->result = scsi_result;
2681                 if (done)
2682                         done(cmnd);
2683                 return 0;
2684         } else {
2685                 unsigned long iflags;
2686                 int k;
2687                 struct sdebug_queued_cmd * sqcp = NULL;
2688
2689                 spin_lock_irqsave(&queued_arr_lock, iflags);
2690                 for (k = 0; k < scsi_debug_max_queue; ++k) {
2691                         sqcp = &queued_arr[k];
2692                         if (! sqcp->in_use)
2693                                 break;
2694                 }
2695                 if (k >= scsi_debug_max_queue) {
2696                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2697                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
2698                         return 1;       /* report busy to mid level */
2699                 }
2700                 sqcp->in_use = 1;
2701                 sqcp->a_cmnd = cmnd;
2702                 sqcp->scsi_result = scsi_result;
2703                 sqcp->done_funct = done;
2704                 sqcp->cmnd_timer.function = timer_intr_handler;
2705                 sqcp->cmnd_timer.data = k;
2706                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
2707                 add_timer(&sqcp->cmnd_timer);
2708                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2709                 if (cmnd)
2710                         cmnd->result = 0;
2711                 return 0;
2712         }
2713 }
2714 /* Note: The following macros create attribute files in the
2715    /sys/module/scsi_debug/parameters directory. Unfortunately this
2716    driver is unaware of a change and cannot trigger auxiliary actions
2717    as it can when the corresponding attribute in the
2718    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
2719  */
2720 module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
2721 module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
2722 module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
2723 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
2724 module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
2725 module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
2726 module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
2727 module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
2728 module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
2729 module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
2730 module_param_named(lbpu, scsi_debug_lbpu, int, S_IRUGO);
2731 module_param_named(lbpws, scsi_debug_lbpws, int, S_IRUGO);
2732 module_param_named(lbpws10, scsi_debug_lbpws10, int, S_IRUGO);
2733 module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
2734 module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
2735 module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
2736 module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
2737 module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
2738 module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
2739 module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
2740 module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
2741 module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
2742 module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
2743 module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
2744 module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
2745 module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
2746 module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
2747 module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
2748 module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
2749 module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
2750 module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
2751 module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
2752                    S_IRUGO | S_IWUSR);
2753 module_param_named(write_same_length, scsi_debug_write_same_length, int,
2754                    S_IRUGO | S_IWUSR);
2755
2756 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
2757 MODULE_DESCRIPTION("SCSI debug adapter driver");
2758 MODULE_LICENSE("GPL");
2759 MODULE_VERSION(SCSI_DEBUG_VERSION);
2760
2761 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
2762 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
2763 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
2764 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)");
2765 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
2766 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
2767 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
2768 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
2769 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
2770 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
2771 MODULE_PARM_DESC(lbpu, "enable LBP, support UNMAP command (def=0)");
2772 MODULE_PARM_DESC(lbpws, "enable LBP, support WRITE SAME(16) with UNMAP bit (def=0)");
2773 MODULE_PARM_DESC(lbpws10, "enable LBP, support WRITE SAME(10) with UNMAP bit (def=0)");
2774 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
2775 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
2776 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
2777 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
2778 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
2779 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
2780 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
2781 MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
2782 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
2783 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
2784 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
2785 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
2786 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
2787 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
2788 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
2789 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
2790 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
2791 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
2792 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
2793 MODULE_PARM_DESC(write_same_length, "Maximum blocks per WRITE SAME cmd (def=0xffff)");
2794
2795 static char sdebug_info[256];
2796
2797 static const char * scsi_debug_info(struct Scsi_Host * shp)
2798 {
2799         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
2800                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
2801                 scsi_debug_version_date, scsi_debug_dev_size_mb,
2802                 scsi_debug_opts);
2803         return sdebug_info;
2804 }
2805
2806 /* scsi_debug_proc_info
2807  * Used if the driver currently has no own support for /proc/scsi
2808  */
2809 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
2810                                 int length, int inout)
2811 {
2812         int len, pos, begin;
2813         int orig_length;
2814
2815         orig_length = length;
2816
2817         if (inout == 1) {
2818                 char arr[16];
2819                 int minLen = length > 15 ? 15 : length;
2820
2821                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2822                         return -EACCES;
2823                 memcpy(arr, buffer, minLen);
2824                 arr[minLen] = '\0';
2825                 if (1 != sscanf(arr, "%d", &pos))
2826                         return -EINVAL;
2827                 scsi_debug_opts = pos;
2828                 if (scsi_debug_every_nth != 0)
2829                         scsi_debug_cmnd_count = 0;
2830                 return length;
2831         }
2832         begin = 0;
2833         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
2834             "%s [%s]\n"
2835             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
2836             "every_nth=%d(curr:%d)\n"
2837             "delay=%d, max_luns=%d, scsi_level=%d\n"
2838             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
2839             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
2840             "host_resets=%d\ndix_reads=%d dix_writes=%d dif_errors=%d\n",
2841             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
2842             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
2843             scsi_debug_cmnd_count, scsi_debug_delay,
2844             scsi_debug_max_luns, scsi_debug_scsi_level,
2845             scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
2846             sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
2847             num_host_resets, dix_reads, dix_writes, dif_errors);
2848         if (pos < offset) {
2849                 len = 0;
2850                 begin = pos;
2851         }
2852         *start = buffer + (offset - begin);     /* Start of wanted data */
2853         len -= (offset - begin);
2854         if (len > length)
2855                 len = length;
2856         return len;
2857 }
2858
2859 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
2860 {
2861         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
2862 }
2863
2864 static ssize_t sdebug_delay_store(struct device_driver * ddp,
2865                                   const char * buf, size_t count)
2866 {
2867         int delay;
2868         char work[20];
2869
2870         if (1 == sscanf(buf, "%10s", work)) {
2871                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
2872                         scsi_debug_delay = delay;
2873                         return count;
2874                 }
2875         }
2876         return -EINVAL;
2877 }
2878 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
2879             sdebug_delay_store);
2880
2881 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
2882 {
2883         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
2884 }
2885
2886 static ssize_t sdebug_opts_store(struct device_driver * ddp,
2887                                  const char * buf, size_t count)
2888 {
2889         int opts;
2890         char work[20];
2891
2892         if (1 == sscanf(buf, "%10s", work)) {
2893                 if (0 == strnicmp(work,"0x", 2)) {
2894                         if (1 == sscanf(&work[2], "%x", &opts))
2895                                 goto opts_done;
2896                 } else {
2897                         if (1 == sscanf(work, "%d", &opts))
2898                                 goto opts_done;
2899                 }
2900         }
2901         return -EINVAL;
2902 opts_done:
2903         scsi_debug_opts = opts;
2904         scsi_debug_cmnd_count = 0;
2905         return count;
2906 }
2907 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
2908             sdebug_opts_store);
2909
2910 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
2911 {
2912         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
2913 }
2914 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
2915                                   const char * buf, size_t count)
2916 {
2917         int n;
2918
2919         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2920                 scsi_debug_ptype = n;
2921                 return count;
2922         }
2923         return -EINVAL;
2924 }
2925 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
2926
2927 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
2928 {
2929         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
2930 }
2931 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
2932                                   const char * buf, size_t count)
2933 {
2934         int n;
2935
2936         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2937                 scsi_debug_dsense = n;
2938                 return count;
2939         }
2940         return -EINVAL;
2941 }
2942 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
2943             sdebug_dsense_store);
2944
2945 static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)
2946 {
2947         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
2948 }
2949 static ssize_t sdebug_fake_rw_store(struct device_driver * ddp,
2950                                     const char * buf, size_t count)
2951 {
2952         int n;
2953
2954         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2955                 scsi_debug_fake_rw = n;
2956                 return count;
2957         }
2958         return -EINVAL;
2959 }
2960 DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
2961             sdebug_fake_rw_store);
2962
2963 static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
2964 {
2965         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
2966 }
2967 static ssize_t sdebug_no_lun_0_store(struct device_driver * ddp,
2968                                      const char * buf, size_t count)
2969 {
2970         int n;
2971
2972         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2973                 scsi_debug_no_lun_0 = n;
2974                 return count;
2975         }
2976         return -EINVAL;
2977 }
2978 DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
2979             sdebug_no_lun_0_store);
2980
2981 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
2982 {
2983         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
2984 }
2985 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
2986                                      const char * buf, size_t count)
2987 {
2988         int n;
2989
2990         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2991                 scsi_debug_num_tgts = n;
2992                 sdebug_max_tgts_luns();
2993                 return count;
2994         }
2995         return -EINVAL;
2996 }
2997 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
2998             sdebug_num_tgts_store);
2999
3000 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
3001 {
3002         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
3003 }
3004 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
3005
3006 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
3007 {
3008         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
3009 }
3010 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
3011
3012 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
3013 {
3014         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
3015 }
3016 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
3017                                       const char * buf, size_t count)
3018 {
3019         int nth;
3020
3021         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
3022                 scsi_debug_every_nth = nth;
3023                 scsi_debug_cmnd_count = 0;
3024                 return count;
3025         }
3026         return -EINVAL;
3027 }
3028 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
3029             sdebug_every_nth_store);
3030
3031 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
3032 {
3033         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
3034 }
3035 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
3036                                      const char * buf, size_t count)
3037 {
3038         int n;
3039
3040         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3041                 scsi_debug_max_luns = n;
3042                 sdebug_max_tgts_luns();
3043                 return count;
3044         }
3045         return -EINVAL;
3046 }
3047 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
3048             sdebug_max_luns_store);
3049
3050 static ssize_t sdebug_max_queue_show(struct device_driver * ddp, char * buf)
3051 {
3052         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
3053 }
3054 static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
3055                                       const char * buf, size_t count)
3056 {
3057         int n;
3058
3059         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
3060             (n <= SCSI_DEBUG_CANQUEUE)) {
3061                 scsi_debug_max_queue = n;
3062                 return count;
3063         }
3064         return -EINVAL;
3065 }
3066 DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
3067             sdebug_max_queue_store);
3068
3069 static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
3070 {
3071         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
3072 }
3073 DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
3074
3075 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
3076 {
3077         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
3078 }
3079 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
3080
3081 static ssize_t sdebug_virtual_gb_show(struct device_driver * ddp, char * buf)
3082 {
3083         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
3084 }
3085 static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
3086                                        const char * buf, size_t count)
3087 {
3088         int n;
3089
3090         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3091                 scsi_debug_virtual_gb = n;
3092
3093                 sdebug_capacity = get_sdebug_capacity();
3094
3095                 return count;
3096         }
3097         return -EINVAL;
3098 }
3099 DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
3100             sdebug_virtual_gb_store);
3101
3102 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
3103 {
3104         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
3105 }
3106
3107 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
3108                                      const char * buf, size_t count)
3109 {
3110         int delta_hosts;
3111
3112         if (sscanf(buf, "%d", &delta_hosts) != 1)
3113                 return -EINVAL;
3114         if (delta_hosts > 0) {
3115                 do {
3116                         sdebug_add_adapter();
3117                 } while (--delta_hosts);
3118         } else if (delta_hosts < 0) {
3119                 do {
3120                         sdebug_remove_adapter();
3121                 } while (++delta_hosts);
3122         }
3123         return count;
3124 }
3125 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
3126             sdebug_add_host_store);
3127
3128 static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
3129                                           char * buf)
3130 {
3131         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
3132 }
3133 static ssize_t sdebug_vpd_use_hostno_store(struct device_driver * ddp,
3134                                            const char * buf, size_t count)
3135 {
3136         int n;
3137
3138         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3139                 scsi_debug_vpd_use_hostno = n;
3140                 return count;
3141         }
3142         return -EINVAL;
3143 }
3144 DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
3145             sdebug_vpd_use_hostno_store);
3146
3147 static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
3148 {
3149         return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
3150 }
3151 DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
3152
3153 static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
3154 {
3155         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
3156 }
3157 DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
3158
3159 static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
3160 {
3161         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
3162 }
3163 DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
3164
3165 static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
3166 {
3167         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
3168 }
3169 DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
3170
3171 static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
3172 {
3173         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
3174 }
3175 DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
3176
3177 static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
3178 {
3179         ssize_t count;
3180
3181         if (!scsi_debug_lbp())
3182                 return scnprintf(buf, PAGE_SIZE, "0-%u\n",
3183                                  sdebug_store_sectors);
3184
3185         count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
3186
3187         buf[count++] = '\n';
3188         buf[count++] = 0;
3189
3190         return count;
3191 }
3192 DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
3193
3194
3195 /* Note: The following function creates attribute files in the
3196    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
3197    files (over those found in the /sys/module/scsi_debug/parameters
3198    directory) is that auxiliary actions can be triggered when an attribute
3199    is changed. For example see: sdebug_add_host_store() above.
3200  */
3201 static int do_create_driverfs_files(void)
3202 {
3203         int ret;
3204
3205         ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3206         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
3207         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3208         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3209         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3210         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3211         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3212         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3213         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3214         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3215         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3216         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3217         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3218         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
3219         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3220         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3221         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3222         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3223         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
3224         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
3225         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
3226         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
3227         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
3228         return ret;
3229 }
3230
3231 static void do_remove_driverfs_files(void)
3232 {
3233         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
3234         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
3235         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
3236         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
3237         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
3238         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3239         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3240         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3241         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3242         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
3243         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3244         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3245         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3246         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3247         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3248         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3249         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3250         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3251         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3252         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3253         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3254         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
3255         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3256 }
3257
3258 struct device *pseudo_primary;
3259
3260 static int __init scsi_debug_init(void)
3261 {
3262         unsigned long sz;
3263         int host_to_add;
3264         int k;
3265         int ret;
3266
3267         switch (scsi_debug_sector_size) {
3268         case  512:
3269         case 1024:
3270         case 2048:
3271         case 4096:
3272                 break;
3273         default:
3274                 printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
3275                        scsi_debug_sector_size);
3276                 return -EINVAL;
3277         }
3278
3279         switch (scsi_debug_dif) {
3280
3281         case SD_DIF_TYPE0_PROTECTION:
3282         case SD_DIF_TYPE1_PROTECTION:
3283         case SD_DIF_TYPE2_PROTECTION:
3284         case SD_DIF_TYPE3_PROTECTION:
3285                 break;
3286
3287         default:
3288                 printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
3289                 return -EINVAL;
3290         }
3291
3292         if (scsi_debug_guard > 1) {
3293                 printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
3294                 return -EINVAL;
3295         }
3296
3297         if (scsi_debug_ato > 1) {
3298                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
3299                 return -EINVAL;
3300         }
3301
3302         if (scsi_debug_physblk_exp > 15) {
3303                 printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
3304                        scsi_debug_physblk_exp);
3305                 return -EINVAL;
3306         }
3307
3308         if (scsi_debug_lowest_aligned > 0x3fff) {
3309                 printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
3310                        scsi_debug_lowest_aligned);
3311                 return -EINVAL;
3312         }
3313
3314         if (scsi_debug_dev_size_mb < 1)
3315                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
3316         sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
3317         sdebug_store_sectors = sz / scsi_debug_sector_size;
3318         sdebug_capacity = get_sdebug_capacity();
3319
3320         /* play around with geometry, don't waste too much on track 0 */
3321         sdebug_heads = 8;
3322         sdebug_sectors_per = 32;
3323         if (scsi_debug_dev_size_mb >= 16)
3324                 sdebug_heads = 32;
3325         else if (scsi_debug_dev_size_mb >= 256)
3326                 sdebug_heads = 64;
3327         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3328                                (sdebug_sectors_per * sdebug_heads);
3329         if (sdebug_cylinders_per >= 1024) {
3330                 /* other LLDs do this; implies >= 1GB ram disk ... */
3331                 sdebug_heads = 255;
3332                 sdebug_sectors_per = 63;
3333                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3334                                (sdebug_sectors_per * sdebug_heads);
3335         }
3336
3337         fake_storep = vmalloc(sz);
3338         if (NULL == fake_storep) {
3339                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
3340                 return -ENOMEM;
3341         }
3342         memset(fake_storep, 0, sz);
3343         if (scsi_debug_num_parts > 0)
3344                 sdebug_build_parts(fake_storep, sz);
3345
3346         if (scsi_debug_dif) {
3347                 int dif_size;
3348
3349                 dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
3350                 dif_storep = vmalloc(dif_size);
3351
3352                 printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
3353                        dif_size, dif_storep);
3354
3355                 if (dif_storep == NULL) {
3356                         printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
3357                         ret = -ENOMEM;
3358                         goto free_vm;
3359                 }
3360
3361                 memset(dif_storep, 0xff, dif_size);
3362         }
3363
3364         /* Logical Block Provisioning */
3365         if (scsi_debug_lbp()) {
3366                 unsigned int map_bytes;
3367
3368                 scsi_debug_unmap_max_blocks =
3369                         clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
3370
3371                 scsi_debug_unmap_max_desc =
3372                         clamp(scsi_debug_unmap_max_desc, 0U, 256U);
3373
3374                 scsi_debug_unmap_granularity =
3375                         clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
3376
3377                 if (scsi_debug_unmap_alignment &&
3378                     scsi_debug_unmap_granularity < scsi_debug_unmap_alignment) {
3379                         printk(KERN_ERR
3380                                "%s: ERR: unmap_granularity < unmap_alignment\n",
3381                                __func__);
3382                         return -EINVAL;
3383                 }
3384
3385                 map_size = (sdebug_store_sectors / scsi_debug_unmap_granularity);
3386                 map_bytes = map_size >> 3;
3387                 map_storep = vmalloc(map_bytes);
3388
3389                 printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
3390                        map_size);
3391
3392                 if (map_storep == NULL) {
3393                         printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
3394                         ret = -ENOMEM;
3395                         goto free_vm;
3396                 }
3397
3398                 memset(map_storep, 0x0, map_bytes);
3399
3400                 /* Map first 1KB for partition table */
3401                 if (scsi_debug_num_parts)
3402                         map_region(0, 2);
3403         }
3404
3405         pseudo_primary = root_device_register("pseudo_0");
3406         if (IS_ERR(pseudo_primary)) {
3407                 printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
3408                 ret = PTR_ERR(pseudo_primary);
3409                 goto free_vm;
3410         }
3411         ret = bus_register(&pseudo_lld_bus);
3412         if (ret < 0) {
3413                 printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
3414                         ret);
3415                 goto dev_unreg;
3416         }
3417         ret = driver_register(&sdebug_driverfs_driver);
3418         if (ret < 0) {
3419                 printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
3420                         ret);
3421                 goto bus_unreg;
3422         }
3423         ret = do_create_driverfs_files();
3424         if (ret < 0) {
3425                 printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
3426                         ret);
3427                 goto del_files;
3428         }
3429
3430         init_all_queued();
3431
3432         host_to_add = scsi_debug_add_host;
3433         scsi_debug_add_host = 0;
3434
3435         for (k = 0; k < host_to_add; k++) {
3436                 if (sdebug_add_adapter()) {
3437                         printk(KERN_ERR "scsi_debug_init: "
3438                                "sdebug_add_adapter failed k=%d\n", k);
3439                         break;
3440                 }
3441         }
3442
3443         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
3444                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
3445                        scsi_debug_add_host);
3446         }
3447         return 0;
3448
3449 del_files:
3450         do_remove_driverfs_files();
3451         driver_unregister(&sdebug_driverfs_driver);
3452 bus_unreg:
3453         bus_unregister(&pseudo_lld_bus);
3454 dev_unreg:
3455         root_device_unregister(pseudo_primary);
3456 free_vm:
3457         if (map_storep)
3458                 vfree(map_storep);
3459         if (dif_storep)
3460                 vfree(dif_storep);
3461         vfree(fake_storep);
3462
3463         return ret;
3464 }
3465
3466 static void __exit scsi_debug_exit(void)
3467 {
3468         int k = scsi_debug_add_host;
3469
3470         stop_all_queued();
3471         for (; k; k--)
3472                 sdebug_remove_adapter();
3473         do_remove_driverfs_files();
3474         driver_unregister(&sdebug_driverfs_driver);
3475         bus_unregister(&pseudo_lld_bus);
3476         root_device_unregister(pseudo_primary);
3477
3478         if (dif_storep)
3479                 vfree(dif_storep);
3480
3481         vfree(fake_storep);
3482 }
3483
3484 device_initcall(scsi_debug_init);
3485 module_exit(scsi_debug_exit);
3486
3487 static void sdebug_release_adapter(struct device * dev)
3488 {
3489         struct sdebug_host_info *sdbg_host;
3490
3491         sdbg_host = to_sdebug_host(dev);
3492         kfree(sdbg_host);
3493 }
3494
3495 static int sdebug_add_adapter(void)
3496 {
3497         int k, devs_per_host;
3498         int error = 0;
3499         struct sdebug_host_info *sdbg_host;
3500         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3501
3502         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
3503         if (NULL == sdbg_host) {
3504                 printk(KERN_ERR "%s: out of memory at line %d\n",
3505                        __func__, __LINE__);
3506                 return -ENOMEM;
3507         }
3508
3509         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
3510
3511         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
3512         for (k = 0; k < devs_per_host; k++) {
3513                 sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
3514                 if (!sdbg_devinfo) {
3515                         printk(KERN_ERR "%s: out of memory at line %d\n",
3516                                __func__, __LINE__);
3517                         error = -ENOMEM;
3518                         goto clean;
3519                 }
3520         }
3521
3522         spin_lock(&sdebug_host_list_lock);
3523         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
3524         spin_unlock(&sdebug_host_list_lock);
3525
3526         sdbg_host->dev.bus = &pseudo_lld_bus;
3527         sdbg_host->dev.parent = pseudo_primary;
3528         sdbg_host->dev.release = &sdebug_release_adapter;
3529         dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
3530
3531         error = device_register(&sdbg_host->dev);
3532
3533         if (error)
3534                 goto clean;
3535
3536         ++scsi_debug_add_host;
3537         return error;
3538
3539 clean:
3540         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
3541                                  dev_list) {
3542                 list_del(&sdbg_devinfo->dev_list);
3543                 kfree(sdbg_devinfo);
3544         }
3545
3546         kfree(sdbg_host);
3547         return error;
3548 }
3549
3550 static void sdebug_remove_adapter(void)
3551 {
3552         struct sdebug_host_info * sdbg_host = NULL;
3553
3554         spin_lock(&sdebug_host_list_lock);
3555         if (!list_empty(&sdebug_host_list)) {
3556                 sdbg_host = list_entry(sdebug_host_list.prev,
3557                                        struct sdebug_host_info, host_list);
3558                 list_del(&sdbg_host->host_list);
3559         }
3560         spin_unlock(&sdebug_host_list_lock);
3561
3562         if (!sdbg_host)
3563                 return;
3564
3565         device_unregister(&sdbg_host->dev);
3566         --scsi_debug_add_host;
3567 }
3568
3569 static
3570 int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
3571 {
3572         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
3573         int len, k;
3574         unsigned int num;
3575         unsigned long long lba;
3576         u32 ei_lba;
3577         int errsts = 0;
3578         int target = SCpnt->device->id;
3579         struct sdebug_dev_info *devip = NULL;
3580         int inj_recovered = 0;
3581         int inj_transport = 0;
3582         int inj_dif = 0;
3583         int inj_dix = 0;
3584         int delay_override = 0;
3585         int unmap = 0;
3586
3587         scsi_set_resid(SCpnt, 0);
3588         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
3589                 printk(KERN_INFO "scsi_debug: cmd ");
3590                 for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
3591                         printk("%02x ", (int)cmd[k]);
3592                 printk("\n");
3593         }
3594
3595         if (target == SCpnt->device->host->hostt->this_id) {
3596                 printk(KERN_INFO "scsi_debug: initiator's id used as "
3597                        "target!\n");
3598                 return schedule_resp(SCpnt, NULL, done,
3599                                      DID_NO_CONNECT << 16, 0);
3600         }
3601
3602         if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
3603             (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
3604                 return schedule_resp(SCpnt, NULL, done,
3605                                      DID_NO_CONNECT << 16, 0);
3606         devip = devInfoReg(SCpnt->device);
3607         if (NULL == devip)
3608                 return schedule_resp(SCpnt, NULL, done,
3609                                      DID_NO_CONNECT << 16, 0);
3610
3611         if ((scsi_debug_every_nth != 0) &&
3612             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
3613                 scsi_debug_cmnd_count = 0;
3614                 if (scsi_debug_every_nth < -1)
3615                         scsi_debug_every_nth = -1;
3616                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
3617                         return 0; /* ignore command causing timeout */
3618                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
3619                         inj_recovered = 1; /* to reads and writes below */
3620                 else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
3621                         inj_transport = 1; /* to reads and writes below */
3622                 else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
3623                         inj_dif = 1; /* to reads and writes below */
3624                 else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
3625                         inj_dix = 1; /* to reads and writes below */
3626         }
3627
3628         if (devip->wlun) {
3629                 switch (*cmd) {
3630                 case INQUIRY:
3631                 case REQUEST_SENSE:
3632                 case TEST_UNIT_READY:
3633                 case REPORT_LUNS:
3634                         break;  /* only allowable wlun commands */
3635                 default:
3636                         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3637                                 printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
3638                                        "not supported for wlun\n", *cmd);
3639                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3640                                         INVALID_OPCODE, 0);
3641                         errsts = check_condition_result;
3642                         return schedule_resp(SCpnt, devip, done, errsts,
3643                                              0);
3644                 }
3645         }
3646
3647         switch (*cmd) {
3648         case INQUIRY:     /* mandatory, ignore unit attention */
3649                 delay_override = 1;
3650                 errsts = resp_inquiry(SCpnt, target, devip);
3651                 break;
3652         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
3653                 delay_override = 1;
3654                 errsts = resp_requests(SCpnt, devip);
3655                 break;
3656         case REZERO_UNIT:       /* actually this is REWIND for SSC */
3657         case START_STOP:
3658                 errsts = resp_start_stop(SCpnt, devip);
3659                 break;
3660         case ALLOW_MEDIUM_REMOVAL:
3661                 errsts = check_readiness(SCpnt, 1, devip);
3662                 if (errsts)
3663                         break;
3664                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3665                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
3666                                cmd[4] ? "inhibited" : "enabled");
3667                 break;
3668         case SEND_DIAGNOSTIC:     /* mandatory */
3669                 errsts = check_readiness(SCpnt, 1, devip);
3670                 break;
3671         case TEST_UNIT_READY:     /* mandatory */
3672                 delay_override = 1;
3673                 errsts = check_readiness(SCpnt, 0, devip);
3674                 break;
3675         case RESERVE:
3676                 errsts = check_readiness(SCpnt, 1, devip);
3677                 break;
3678         case RESERVE_10:
3679                 errsts = check_readiness(SCpnt, 1, devip);
3680                 break;
3681         case RELEASE:
3682                 errsts = check_readiness(SCpnt, 1, devip);
3683                 break;
3684         case RELEASE_10:
3685                 errsts = check_readiness(SCpnt, 1, devip);
3686                 break;
3687         case READ_CAPACITY:
3688                 errsts = resp_readcap(SCpnt, devip);
3689                 break;
3690         case SERVICE_ACTION_IN:
3691                 if (cmd[1] == SAI_READ_CAPACITY_16)
3692                         errsts = resp_readcap16(SCpnt, devip);
3693                 else if (cmd[1] == SAI_GET_LBA_STATUS) {
3694
3695                         if (scsi_debug_lbp() == 0) {
3696                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3697                                                 INVALID_COMMAND_OPCODE, 0);
3698                                 errsts = check_condition_result;
3699                         } else
3700                                 errsts = resp_get_lba_status(SCpnt, devip);
3701                 } else {
3702                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3703                                         INVALID_OPCODE, 0);
3704                         errsts = check_condition_result;
3705                 }
3706                 break;
3707         case MAINTENANCE_IN:
3708                 if (MI_REPORT_TARGET_PGS != cmd[1]) {
3709                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3710                                         INVALID_OPCODE, 0);
3711                         errsts = check_condition_result;
3712                         break;
3713                 }
3714                 errsts = resp_report_tgtpgs(SCpnt, devip);
3715                 break;
3716         case READ_16:
3717         case READ_12:
3718         case READ_10:
3719                 /* READ{10,12,16} and DIF Type 2 are natural enemies */
3720                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3721                     cmd[1] & 0xe0) {
3722                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3723                                         INVALID_COMMAND_OPCODE, 0);
3724                         errsts = check_condition_result;
3725                         break;
3726                 }
3727
3728                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3729                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3730                     (cmd[1] & 0xe0) == 0)
3731                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3732
3733                 /* fall through */
3734         case READ_6:
3735 read:
3736                 errsts = check_readiness(SCpnt, 0, devip);
3737                 if (errsts)
3738                         break;
3739                 if (scsi_debug_fake_rw)
3740                         break;
3741                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3742                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3743                 if (inj_recovered && (0 == errsts)) {
3744                         mk_sense_buffer(devip, RECOVERED_ERROR,
3745                                         THRESHOLD_EXCEEDED, 0);
3746                         errsts = check_condition_result;
3747                 } else if (inj_transport && (0 == errsts)) {
3748                         mk_sense_buffer(devip, ABORTED_COMMAND,
3749                                         TRANSPORT_PROBLEM, ACK_NAK_TO);
3750                         errsts = check_condition_result;
3751                 } else if (inj_dif && (0 == errsts)) {
3752                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3753                         errsts = illegal_condition_result;
3754                 } else if (inj_dix && (0 == errsts)) {
3755                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3756                         errsts = illegal_condition_result;
3757                 }
3758                 break;
3759         case REPORT_LUNS:       /* mandatory, ignore unit attention */
3760                 delay_override = 1;
3761                 errsts = resp_report_luns(SCpnt, devip);
3762                 break;
3763         case VERIFY:            /* 10 byte SBC-2 command */
3764                 errsts = check_readiness(SCpnt, 0, devip);
3765                 break;
3766         case WRITE_16:
3767         case WRITE_12:
3768         case WRITE_10:
3769                 /* WRITE{10,12,16} and DIF Type 2 are natural enemies */
3770                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3771                     cmd[1] & 0xe0) {
3772                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3773                                         INVALID_COMMAND_OPCODE, 0);
3774                         errsts = check_condition_result;
3775                         break;
3776                 }
3777
3778                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3779                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3780                     (cmd[1] & 0xe0) == 0)
3781                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3782
3783                 /* fall through */
3784         case WRITE_6:
3785 write:
3786                 errsts = check_readiness(SCpnt, 0, devip);
3787                 if (errsts)
3788                         break;
3789                 if (scsi_debug_fake_rw)
3790                         break;
3791                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3792                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3793                 if (inj_recovered && (0 == errsts)) {
3794                         mk_sense_buffer(devip, RECOVERED_ERROR,
3795                                         THRESHOLD_EXCEEDED, 0);
3796                         errsts = check_condition_result;
3797                 } else if (inj_dif && (0 == errsts)) {
3798                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3799                         errsts = illegal_condition_result;
3800                 } else if (inj_dix && (0 == errsts)) {
3801                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3802                         errsts = illegal_condition_result;
3803                 }
3804                 break;
3805         case WRITE_SAME_16:
3806         case WRITE_SAME:
3807                 if (cmd[1] & 0x8) {
3808                         if ((*cmd == WRITE_SAME_16 && scsi_debug_lbpws == 0) ||
3809                             (*cmd == WRITE_SAME && scsi_debug_lbpws10 == 0)) {
3810                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3811                                                 INVALID_FIELD_IN_CDB, 0);
3812                                 errsts = check_condition_result;
3813                         } else
3814                                 unmap = 1;
3815                 }
3816                 if (errsts)
3817                         break;
3818                 errsts = check_readiness(SCpnt, 0, devip);
3819                 if (errsts)
3820                         break;
3821                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3822                 errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
3823                 break;
3824         case UNMAP:
3825                 errsts = check_readiness(SCpnt, 0, devip);
3826                 if (errsts)
3827                         break;
3828
3829                 if (scsi_debug_unmap_max_desc == 0 || scsi_debug_lbpu == 0) {
3830                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3831                                         INVALID_COMMAND_OPCODE, 0);
3832                         errsts = check_condition_result;
3833                 } else
3834                         errsts = resp_unmap(SCpnt, devip);
3835                 break;
3836         case MODE_SENSE:
3837         case MODE_SENSE_10:
3838                 errsts = resp_mode_sense(SCpnt, target, devip);
3839                 break;
3840         case MODE_SELECT:
3841                 errsts = resp_mode_select(SCpnt, 1, devip);
3842                 break;
3843         case MODE_SELECT_10:
3844                 errsts = resp_mode_select(SCpnt, 0, devip);
3845                 break;
3846         case LOG_SENSE:
3847                 errsts = resp_log_sense(SCpnt, devip);
3848                 break;
3849         case SYNCHRONIZE_CACHE:
3850                 delay_override = 1;
3851                 errsts = check_readiness(SCpnt, 0, devip);
3852                 break;
3853         case WRITE_BUFFER:
3854                 errsts = check_readiness(SCpnt, 1, devip);
3855                 break;
3856         case XDWRITEREAD_10:
3857                 if (!scsi_bidi_cmnd(SCpnt)) {
3858                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3859                                         INVALID_FIELD_IN_CDB, 0);
3860                         errsts = check_condition_result;
3861                         break;
3862                 }
3863
3864                 errsts = check_readiness(SCpnt, 0, devip);
3865                 if (errsts)
3866                         break;
3867                 if (scsi_debug_fake_rw)
3868                         break;
3869                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3870                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3871                 if (errsts)
3872                         break;
3873                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3874                 if (errsts)
3875                         break;
3876                 errsts = resp_xdwriteread(SCpnt, lba, num, devip);
3877                 break;
3878         case VARIABLE_LENGTH_CMD:
3879                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
3880
3881                         if ((cmd[10] & 0xe0) == 0)
3882                                 printk(KERN_ERR
3883                                        "Unprotected RD/WR to DIF device\n");
3884
3885                         if (cmd[9] == READ_32) {
3886                                 BUG_ON(SCpnt->cmd_len < 32);
3887                                 goto read;
3888                         }
3889
3890                         if (cmd[9] == WRITE_32) {
3891                                 BUG_ON(SCpnt->cmd_len < 32);
3892                                 goto write;
3893                         }
3894                 }
3895
3896                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3897                                 INVALID_FIELD_IN_CDB, 0);
3898                 errsts = check_condition_result;
3899                 break;
3900
3901         default:
3902                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3903                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
3904                                "supported\n", *cmd);
3905                 errsts = check_readiness(SCpnt, 1, devip);
3906                 if (errsts)
3907                         break;  /* Unit attention takes precedence */
3908                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
3909                 errsts = check_condition_result;
3910                 break;
3911         }
3912         return schedule_resp(SCpnt, devip, done, errsts,
3913                              (delay_override ? 0 : scsi_debug_delay));
3914 }
3915
3916 static DEF_SCSI_QCMD(scsi_debug_queuecommand)
3917
3918 static struct scsi_host_template sdebug_driver_template = {
3919         .proc_info =            scsi_debug_proc_info,
3920         .proc_name =            sdebug_proc_name,
3921         .name =                 "SCSI DEBUG",
3922         .info =                 scsi_debug_info,
3923         .slave_alloc =          scsi_debug_slave_alloc,
3924         .slave_configure =      scsi_debug_slave_configure,
3925         .slave_destroy =        scsi_debug_slave_destroy,
3926         .ioctl =                scsi_debug_ioctl,
3927         .queuecommand =         scsi_debug_queuecommand,
3928         .eh_abort_handler =     scsi_debug_abort,
3929         .eh_bus_reset_handler = scsi_debug_bus_reset,
3930         .eh_device_reset_handler = scsi_debug_device_reset,
3931         .eh_host_reset_handler = scsi_debug_host_reset,
3932         .bios_param =           scsi_debug_biosparam,
3933         .can_queue =            SCSI_DEBUG_CANQUEUE,
3934         .this_id =              7,
3935         .sg_tablesize =         256,
3936         .cmd_per_lun =          16,
3937         .max_sectors =          0xffff,
3938         .use_clustering =       DISABLE_CLUSTERING,
3939         .module =               THIS_MODULE,
3940 };
3941
3942 static int sdebug_driver_probe(struct device * dev)
3943 {
3944         int error = 0;
3945         struct sdebug_host_info *sdbg_host;
3946         struct Scsi_Host *hpnt;
3947         int host_prot;
3948
3949         sdbg_host = to_sdebug_host(dev);
3950
3951         sdebug_driver_template.can_queue = scsi_debug_max_queue;
3952         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
3953         if (NULL == hpnt) {
3954                 printk(KERN_ERR "%s: scsi_register failed\n", __func__);
3955                 error = -ENODEV;
3956                 return error;
3957         }
3958
3959         sdbg_host->shost = hpnt;
3960         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
3961         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
3962                 hpnt->max_id = scsi_debug_num_tgts + 1;
3963         else
3964                 hpnt->max_id = scsi_debug_num_tgts;
3965         hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;  /* = scsi_debug_max_luns; */
3966
3967         host_prot = 0;
3968
3969         switch (scsi_debug_dif) {
3970
3971         case SD_DIF_TYPE1_PROTECTION:
3972                 host_prot = SHOST_DIF_TYPE1_PROTECTION;
3973                 if (scsi_debug_dix)
3974                         host_prot |= SHOST_DIX_TYPE1_PROTECTION;
3975                 break;
3976
3977         case SD_DIF_TYPE2_PROTECTION:
3978                 host_prot = SHOST_DIF_TYPE2_PROTECTION;
3979                 if (scsi_debug_dix)
3980                         host_prot |= SHOST_DIX_TYPE2_PROTECTION;
3981                 break;
3982
3983         case SD_DIF_TYPE3_PROTECTION:
3984                 host_prot = SHOST_DIF_TYPE3_PROTECTION;
3985                 if (scsi_debug_dix)
3986                         host_prot |= SHOST_DIX_TYPE3_PROTECTION;
3987                 break;
3988
3989         default:
3990                 if (scsi_debug_dix)
3991                         host_prot |= SHOST_DIX_TYPE0_PROTECTION;
3992                 break;
3993         }
3994
3995         scsi_host_set_prot(hpnt, host_prot);
3996
3997         printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
3998                (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
3999                (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
4000                (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
4001                (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
4002                (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
4003                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
4004                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
4005
4006         if (scsi_debug_guard == 1)
4007                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
4008         else
4009                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
4010
4011         error = scsi_add_host(hpnt, &sdbg_host->dev);
4012         if (error) {
4013                 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
4014                 error = -ENODEV;
4015                 scsi_host_put(hpnt);
4016         } else
4017                 scsi_scan_host(hpnt);
4018
4019
4020         return error;
4021 }
4022
4023 static int sdebug_driver_remove(struct device * dev)
4024 {
4025         struct sdebug_host_info *sdbg_host;
4026         struct sdebug_dev_info *sdbg_devinfo, *tmp;
4027
4028         sdbg_host = to_sdebug_host(dev);
4029
4030         if (!sdbg_host) {
4031                 printk(KERN_ERR "%s: Unable to locate host info\n",
4032                        __func__);
4033                 return -ENODEV;
4034         }
4035
4036         scsi_remove_host(sdbg_host->shost);
4037
4038         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
4039                                  dev_list) {
4040                 list_del(&sdbg_devinfo->dev_list);
4041                 kfree(sdbg_devinfo);
4042         }
4043
4044         scsi_host_put(sdbg_host->shost);
4045         return 0;
4046 }
4047
4048 static int pseudo_lld_bus_match(struct device *dev,
4049                                 struct device_driver *dev_driver)
4050 {
4051         return 1;
4052 }
4053
4054 static struct bus_type pseudo_lld_bus = {
4055         .name = "pseudo",
4056         .match = pseudo_lld_bus_match,
4057         .probe = sdebug_driver_probe,
4058         .remove = sdebug_driver_remove,
4059 };