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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCSI_SCSI_CMND_H
3#define _SCSI_SCSI_CMND_H
4
5#include <linux/dma-mapping.h>
6#include <linux/blkdev.h>
7#include <linux/t10-pi.h>
8#include <linux/list.h>
9#include <linux/types.h>
10#include <linux/timer.h>
11#include <linux/scatterlist.h>
12#include <scsi/scsi_device.h>
13
14struct Scsi_Host;
15
16/*
17 * MAX_COMMAND_SIZE is:
18 * The longest fixed-length SCSI CDB as per the SCSI standard.
19 * fixed-length means: commands that their size can be determined
20 * by their opcode and the CDB does not carry a length specifier, (unlike
21 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
22 * true and the SCSI standard also defines extended commands and
23 * vendor specific commands that can be bigger than 16 bytes. The kernel
24 * will support these using the same infrastructure used for VARLEN CDB's.
25 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
26 * supports without specifying a cmd_len by ULD's
27 */
28#define MAX_COMMAND_SIZE 16
29
30struct scsi_data_buffer {
31 struct sg_table table;
32 unsigned length;
33};
34
35/* embedded in scsi_cmnd */
36struct scsi_pointer {
37 char *ptr; /* data pointer */
38 int this_residual; /* left in this buffer */
39 struct scatterlist *buffer; /* which buffer */
40 int buffers_residual; /* how many buffers left */
41
42 dma_addr_t dma_handle;
43
44 volatile int Status;
45 volatile int Message;
46 volatile int have_data_in;
47 volatile int sent_command;
48 volatile int phase;
49};
50
51/* for scmd->flags */
52#define SCMD_TAGGED (1 << 0)
53#define SCMD_INITIALIZED (1 << 1)
54#define SCMD_LAST (1 << 2)
55#define SCMD_FAIL_IF_RECOVERING (1 << 4)
56/* flags preserved across unprep / reprep */
57#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED | SCMD_FAIL_IF_RECOVERING)
58
59/* for scmd->state */
60#define SCMD_STATE_COMPLETE 0
61#define SCMD_STATE_INFLIGHT 1
62
63enum scsi_cmnd_submitter {
64 SUBMITTED_BY_BLOCK_LAYER = 0,
65 SUBMITTED_BY_SCSI_ERROR_HANDLER = 1,
66 SUBMITTED_BY_SCSI_RESET_IOCTL = 2,
67} __packed;
68
69struct scsi_cmnd {
70 struct scsi_device *device;
71 struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */
72 struct delayed_work abort_work;
73
74 struct rcu_head rcu;
75
76 int eh_eflags; /* Used by error handlr */
77
78 int budget_token;
79
80 /*
81 * This is set to jiffies as it was when the command was first
82 * allocated. It is used to time how long the command has
83 * been outstanding
84 */
85 unsigned long jiffies_at_alloc;
86
87 int retries;
88 int allowed;
89
90 unsigned char prot_op;
91 unsigned char prot_type;
92 unsigned char prot_flags;
93 enum scsi_cmnd_submitter submitter;
94
95 unsigned short cmd_len;
96 enum dma_data_direction sc_data_direction;
97
98 unsigned char cmnd[32]; /* SCSI CDB */
99
100 /* These elements define the operation we ultimately want to perform */
101 struct scsi_data_buffer sdb;
102 struct scsi_data_buffer *prot_sdb;
103
104 unsigned underflow; /* Return error if less than
105 this amount is transferred */
106
107 unsigned transfersize; /* How much we are guaranteed to
108 transfer with each SCSI transfer
109 (ie, between disconnect /
110 reconnects. Probably == sector
111 size */
112 unsigned resid_len; /* residual count */
113 unsigned sense_len;
114 unsigned char *sense_buffer;
115 /* obtained by REQUEST SENSE when
116 * CHECK CONDITION is received on original
117 * command (auto-sense). Length must be
118 * SCSI_SENSE_BUFFERSIZE bytes. */
119
120 int flags; /* Command flags */
121 unsigned long state; /* Command completion state */
122
123 unsigned int extra_len; /* length of alignment and padding */
124
125 /*
126 * The fields below can be modified by the LLD but the fields above
127 * must not be modified.
128 */
129
130 unsigned char *host_scribble; /* The host adapter is allowed to
131 * call scsi_malloc and get some memory
132 * and hang it here. The host adapter
133 * is also expected to call scsi_free
134 * to release this memory. (The memory
135 * obtained by scsi_malloc is guaranteed
136 * to be at an address < 16Mb). */
137
138 int result; /* Status code from lower level driver */
139};
140
141/* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
142static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
143{
144 return blk_mq_rq_from_pdu(scmd);
145}
146
147/*
148 * Return the driver private allocation behind the command.
149 * Only works if cmd_size is set in the host template.
150 */
151static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
152{
153 return cmd + 1;
154}
155
156void scsi_done(struct scsi_cmnd *cmd);
157void scsi_done_direct(struct scsi_cmnd *cmd);
158
159extern void scsi_finish_command(struct scsi_cmnd *cmd);
160
161extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
162 size_t *offset, size_t *len);
163extern void scsi_kunmap_atomic_sg(void *virt);
164
165blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
166void scsi_free_sgtables(struct scsi_cmnd *cmd);
167
168#ifdef CONFIG_SCSI_DMA
169extern int scsi_dma_map(struct scsi_cmnd *cmd);
170extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
171#else /* !CONFIG_SCSI_DMA */
172static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
173static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
174#endif /* !CONFIG_SCSI_DMA */
175
176static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
177{
178 return cmd->sdb.table.nents;
179}
180
181static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
182{
183 return cmd->sdb.table.sgl;
184}
185
186static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
187{
188 return cmd->sdb.length;
189}
190
191static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid)
192{
193 cmd->resid_len = resid;
194}
195
196static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
197{
198 return cmd->resid_len;
199}
200
201#define scsi_for_each_sg(cmd, sg, nseg, __i) \
202 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
203
204static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
205 const void *buf, int buflen)
206{
207 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
208 buf, buflen);
209}
210
211static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
212 void *buf, int buflen)
213{
214 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
215 buf, buflen);
216}
217
218static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
219{
220 return blk_rq_pos(scsi_cmd_to_rq(scmd));
221}
222
223static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
224{
225 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
226
227 return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
228}
229
230static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
231{
232 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
233
234 return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
235}
236
237/*
238 * The operations below are hints that tell the controller driver how
239 * to handle I/Os with DIF or similar types of protection information.
240 */
241enum scsi_prot_operations {
242 /* Normal I/O */
243 SCSI_PROT_NORMAL = 0,
244
245 /* OS-HBA: Protected, HBA-Target: Unprotected */
246 SCSI_PROT_READ_INSERT,
247 SCSI_PROT_WRITE_STRIP,
248
249 /* OS-HBA: Unprotected, HBA-Target: Protected */
250 SCSI_PROT_READ_STRIP,
251 SCSI_PROT_WRITE_INSERT,
252
253 /* OS-HBA: Protected, HBA-Target: Protected */
254 SCSI_PROT_READ_PASS,
255 SCSI_PROT_WRITE_PASS,
256};
257
258static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
259{
260 scmd->prot_op = op;
261}
262
263static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
264{
265 return scmd->prot_op;
266}
267
268enum scsi_prot_flags {
269 SCSI_PROT_TRANSFER_PI = 1 << 0,
270 SCSI_PROT_GUARD_CHECK = 1 << 1,
271 SCSI_PROT_REF_CHECK = 1 << 2,
272 SCSI_PROT_REF_INCREMENT = 1 << 3,
273 SCSI_PROT_IP_CHECKSUM = 1 << 4,
274};
275
276/*
277 * The controller usually does not know anything about the target it
278 * is communicating with. However, when DIX is enabled the controller
279 * must be know target type so it can verify the protection
280 * information passed along with the I/O.
281 */
282enum scsi_prot_target_type {
283 SCSI_PROT_DIF_TYPE0 = 0,
284 SCSI_PROT_DIF_TYPE1,
285 SCSI_PROT_DIF_TYPE2,
286 SCSI_PROT_DIF_TYPE3,
287};
288
289static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
290{
291 scmd->prot_type = type;
292}
293
294static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
295{
296 return scmd->prot_type;
297}
298
299static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
300{
301 struct request *rq = blk_mq_rq_from_pdu(scmd);
302
303 return t10_pi_ref_tag(rq);
304}
305
306static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
307{
308 return scmd->device->sector_size;
309}
310
311static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
312{
313 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
314}
315
316static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
317{
318 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
319}
320
321static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
322{
323 return cmd->prot_sdb;
324}
325
326#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
327 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
328
329static inline void set_status_byte(struct scsi_cmnd *cmd, char status)
330{
331 cmd->result = (cmd->result & 0xffffff00) | status;
332}
333
334static inline u8 get_status_byte(struct scsi_cmnd *cmd)
335{
336 return cmd->result & 0xff;
337}
338
339static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
340{
341 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
342}
343
344static inline u8 get_host_byte(struct scsi_cmnd *cmd)
345{
346 return (cmd->result >> 16) & 0xff;
347}
348
349/**
350 * scsi_msg_to_host_byte() - translate message byte
351 *
352 * Translate the SCSI parallel message byte to a matching
353 * host byte setting. A message of COMMAND_COMPLETE indicates
354 * a successful command execution, any other message indicate
355 * an error. As the messages themselves only have a meaning
356 * for the SCSI parallel protocol this function translates
357 * them into a matching host byte value for SCSI EH.
358 */
359static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
360{
361 switch (msg) {
362 case COMMAND_COMPLETE:
363 break;
364 case ABORT_TASK_SET:
365 set_host_byte(cmd, DID_ABORT);
366 break;
367 case TARGET_RESET:
368 set_host_byte(cmd, DID_RESET);
369 break;
370 default:
371 set_host_byte(cmd, DID_ERROR);
372 break;
373 }
374}
375
376static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
377{
378 unsigned int xfer_len = scmd->sdb.length;
379 unsigned int prot_interval = scsi_prot_interval(scmd);
380
381 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
382 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
383
384 return xfer_len;
385}
386
387extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
388 u8 key, u8 asc, u8 ascq);
389
390struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
391 blk_mq_req_flags_t flags);
392
393#endif /* _SCSI_SCSI_CMND_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SCSI_SCSI_CMND_H
3#define _SCSI_SCSI_CMND_H
4
5#include <linux/dma-mapping.h>
6#include <linux/blkdev.h>
7#include <linux/list.h>
8#include <linux/types.h>
9#include <linux/timer.h>
10#include <linux/scatterlist.h>
11#include <scsi/scsi_device.h>
12#include <scsi/scsi_request.h>
13
14struct Scsi_Host;
15struct scsi_driver;
16
17#include <scsi/scsi_device.h>
18
19/*
20 * MAX_COMMAND_SIZE is:
21 * The longest fixed-length SCSI CDB as per the SCSI standard.
22 * fixed-length means: commands that their size can be determined
23 * by their opcode and the CDB does not carry a length specifier, (unlike
24 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
25 * true and the SCSI standard also defines extended commands and
26 * vendor specific commands that can be bigger than 16 bytes. The kernel
27 * will support these using the same infrastructure used for VARLEN CDB's.
28 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
29 * supports without specifying a cmd_len by ULD's
30 */
31#define MAX_COMMAND_SIZE 16
32#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
33# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
34#endif
35
36struct scsi_data_buffer {
37 struct sg_table table;
38 unsigned length;
39 int resid;
40};
41
42/* embedded in scsi_cmnd */
43struct scsi_pointer {
44 char *ptr; /* data pointer */
45 int this_residual; /* left in this buffer */
46 struct scatterlist *buffer; /* which buffer */
47 int buffers_residual; /* how many buffers left */
48
49 dma_addr_t dma_handle;
50
51 volatile int Status;
52 volatile int Message;
53 volatile int have_data_in;
54 volatile int sent_command;
55 volatile int phase;
56};
57
58/* for scmd->flags */
59#define SCMD_TAGGED (1 << 0)
60#define SCMD_UNCHECKED_ISA_DMA (1 << 1)
61#define SCMD_INITIALIZED (1 << 2)
62/* flags preserved across unprep / reprep */
63#define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED)
64
65struct scsi_cmnd {
66 struct scsi_request req;
67 struct scsi_device *device;
68 struct list_head list; /* scsi_cmnd participates in queue lists */
69 struct list_head eh_entry; /* entry for the host eh_cmd_q */
70 struct delayed_work abort_work;
71
72 struct rcu_head rcu;
73
74 int eh_eflags; /* Used by error handlr */
75
76 /*
77 * A SCSI Command is assigned a nonzero serial_number before passed
78 * to the driver's queue command function. The serial_number is
79 * cleared when scsi_done is entered indicating that the command
80 * has been completed. It is a bug for LLDDs to use this number
81 * for purposes other than printk (and even that is only useful
82 * for debugging).
83 */
84 unsigned long serial_number;
85
86 /*
87 * This is set to jiffies as it was when the command was first
88 * allocated. It is used to time how long the command has
89 * been outstanding
90 */
91 unsigned long jiffies_at_alloc;
92
93 int retries;
94 int allowed;
95
96 unsigned char prot_op;
97 unsigned char prot_type;
98 unsigned char prot_flags;
99
100 unsigned short cmd_len;
101 enum dma_data_direction sc_data_direction;
102
103 /* These elements define the operation we are about to perform */
104 unsigned char *cmnd;
105
106
107 /* These elements define the operation we ultimately want to perform */
108 struct scsi_data_buffer sdb;
109 struct scsi_data_buffer *prot_sdb;
110
111 unsigned underflow; /* Return error if less than
112 this amount is transferred */
113
114 unsigned transfersize; /* How much we are guaranteed to
115 transfer with each SCSI transfer
116 (ie, between disconnect /
117 reconnects. Probably == sector
118 size */
119
120 struct request *request; /* The command we are
121 working on */
122
123#define SCSI_SENSE_BUFFERSIZE 96
124 unsigned char *sense_buffer;
125 /* obtained by REQUEST SENSE when
126 * CHECK CONDITION is received on original
127 * command (auto-sense) */
128
129 /* Low-level done function - can be used by low-level driver to point
130 * to completion function. Not used by mid/upper level code. */
131 void (*scsi_done) (struct scsi_cmnd *);
132
133 /*
134 * The following fields can be written to by the host specific code.
135 * Everything else should be left alone.
136 */
137 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
138
139 unsigned char *host_scribble; /* The host adapter is allowed to
140 * call scsi_malloc and get some memory
141 * and hang it here. The host adapter
142 * is also expected to call scsi_free
143 * to release this memory. (The memory
144 * obtained by scsi_malloc is guaranteed
145 * to be at an address < 16Mb). */
146
147 int result; /* Status code from lower level driver */
148 int flags; /* Command flags */
149
150 unsigned char tag; /* SCSI-II queued command tag */
151};
152
153/*
154 * Return the driver private allocation behind the command.
155 * Only works if cmd_size is set in the host template.
156 */
157static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd)
158{
159 return cmd + 1;
160}
161
162/* make sure not to use it with passthrough commands */
163static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
164{
165 return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
166}
167
168extern void scsi_put_command(struct scsi_cmnd *);
169extern void scsi_finish_command(struct scsi_cmnd *cmd);
170
171extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
172 size_t *offset, size_t *len);
173extern void scsi_kunmap_atomic_sg(void *virt);
174
175extern int scsi_init_io(struct scsi_cmnd *cmd);
176
177#ifdef CONFIG_SCSI_DMA
178extern int scsi_dma_map(struct scsi_cmnd *cmd);
179extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
180#else /* !CONFIG_SCSI_DMA */
181static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; }
182static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { }
183#endif /* !CONFIG_SCSI_DMA */
184
185static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
186{
187 return cmd->sdb.table.nents;
188}
189
190static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
191{
192 return cmd->sdb.table.sgl;
193}
194
195static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
196{
197 return cmd->sdb.length;
198}
199
200static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
201{
202 cmd->sdb.resid = resid;
203}
204
205static inline int scsi_get_resid(struct scsi_cmnd *cmd)
206{
207 return cmd->sdb.resid;
208}
209
210#define scsi_for_each_sg(cmd, sg, nseg, __i) \
211 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
212
213static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
214{
215 return blk_bidi_rq(cmd->request) &&
216 (cmd->request->next_rq->special != NULL);
217}
218
219static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
220{
221 return scsi_bidi_cmnd(cmd) ?
222 cmd->request->next_rq->special : &cmd->sdb;
223}
224
225static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
226{
227 return &cmd->sdb;
228}
229
230static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
231 void *buf, int buflen)
232{
233 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
234 buf, buflen);
235}
236
237static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
238 void *buf, int buflen)
239{
240 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
241 buf, buflen);
242}
243
244/*
245 * The operations below are hints that tell the controller driver how
246 * to handle I/Os with DIF or similar types of protection information.
247 */
248enum scsi_prot_operations {
249 /* Normal I/O */
250 SCSI_PROT_NORMAL = 0,
251
252 /* OS-HBA: Protected, HBA-Target: Unprotected */
253 SCSI_PROT_READ_INSERT,
254 SCSI_PROT_WRITE_STRIP,
255
256 /* OS-HBA: Unprotected, HBA-Target: Protected */
257 SCSI_PROT_READ_STRIP,
258 SCSI_PROT_WRITE_INSERT,
259
260 /* OS-HBA: Protected, HBA-Target: Protected */
261 SCSI_PROT_READ_PASS,
262 SCSI_PROT_WRITE_PASS,
263};
264
265static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
266{
267 scmd->prot_op = op;
268}
269
270static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
271{
272 return scmd->prot_op;
273}
274
275enum scsi_prot_flags {
276 SCSI_PROT_TRANSFER_PI = 1 << 0,
277 SCSI_PROT_GUARD_CHECK = 1 << 1,
278 SCSI_PROT_REF_CHECK = 1 << 2,
279 SCSI_PROT_REF_INCREMENT = 1 << 3,
280 SCSI_PROT_IP_CHECKSUM = 1 << 4,
281};
282
283/*
284 * The controller usually does not know anything about the target it
285 * is communicating with. However, when DIX is enabled the controller
286 * must be know target type so it can verify the protection
287 * information passed along with the I/O.
288 */
289enum scsi_prot_target_type {
290 SCSI_PROT_DIF_TYPE0 = 0,
291 SCSI_PROT_DIF_TYPE1,
292 SCSI_PROT_DIF_TYPE2,
293 SCSI_PROT_DIF_TYPE3,
294};
295
296static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
297{
298 scmd->prot_type = type;
299}
300
301static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
302{
303 return scmd->prot_type;
304}
305
306static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
307{
308 return blk_rq_pos(scmd->request);
309}
310
311static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd)
312{
313 return scmd->device->sector_size;
314}
315
316static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
317{
318 return blk_rq_pos(scmd->request) >>
319 (ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
320}
321
322static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
323{
324 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
325}
326
327static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
328{
329 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
330}
331
332static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
333{
334 return cmd->prot_sdb;
335}
336
337#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
338 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
339
340static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
341{
342 cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
343}
344
345static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
346{
347 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
348}
349
350static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
351{
352 cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
353}
354
355static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd)
356{
357 unsigned int xfer_len = scsi_out(scmd)->length;
358 unsigned int prot_interval = scsi_prot_interval(scmd);
359
360 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI)
361 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8;
362
363 return xfer_len;
364}
365
366#endif /* _SCSI_SCSI_CMND_H */