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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _SCSI_SCSI_CMND_H |
3 | #define _SCSI_SCSI_CMND_H | |
4 | ||
5 | #include <linux/dma-mapping.h> | |
6f9a35e2 | 6 | #include <linux/blkdev.h> |
ddd0bc75 | 7 | #include <linux/t10-pi.h> |
1da177e4 LT |
8 | #include <linux/list.h> |
9 | #include <linux/types.h> | |
4e57b681 | 10 | #include <linux/timer.h> |
c6132da1 | 11 | #include <linux/scatterlist.h> |
8846bab1 | 12 | #include <scsi/scsi_device.h> |
82ed4db4 | 13 | #include <scsi/scsi_request.h> |
1da177e4 | 14 | |
b58d9154 | 15 | struct Scsi_Host; |
18a4d0a2 | 16 | struct scsi_driver; |
1da177e4 | 17 | |
64a87b24 BH |
18 | /* |
19 | * MAX_COMMAND_SIZE is: | |
20 | * The longest fixed-length SCSI CDB as per the SCSI standard. | |
21 | * fixed-length means: commands that their size can be determined | |
22 | * by their opcode and the CDB does not carry a length specifier, (unlike | |
23 | * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly | |
24 | * true and the SCSI standard also defines extended commands and | |
25 | * vendor specific commands that can be bigger than 16 bytes. The kernel | |
26 | * will support these using the same infrastructure used for VARLEN CDB's. | |
27 | * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml | |
28 | * supports without specifying a cmd_len by ULD's | |
29 | */ | |
30 | #define MAX_COMMAND_SIZE 16 | |
31 | #if (MAX_COMMAND_SIZE > BLK_MAX_CDB) | |
32 | # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB | |
33 | #endif | |
34 | ||
30b0c37b BH |
35 | struct scsi_data_buffer { |
36 | struct sg_table table; | |
37 | unsigned length; | |
30b0c37b | 38 | }; |
1da177e4 LT |
39 | |
40 | /* embedded in scsi_cmnd */ | |
41 | struct scsi_pointer { | |
42 | char *ptr; /* data pointer */ | |
43 | int this_residual; /* left in this buffer */ | |
44 | struct scatterlist *buffer; /* which buffer */ | |
45 | int buffers_residual; /* how many buffers left */ | |
46 | ||
47 | dma_addr_t dma_handle; | |
48 | ||
49 | volatile int Status; | |
50 | volatile int Message; | |
51 | volatile int have_data_in; | |
52 | volatile int sent_command; | |
53 | volatile int phase; | |
54 | }; | |
55 | ||
125c99bc CH |
56 | /* for scmd->flags */ |
57 | #define SCMD_TAGGED (1 << 0) | |
aaff5eba CH |
58 | #define SCMD_INITIALIZED (1 << 1) |
59 | #define SCMD_LAST (1 << 2) | |
64104f70 | 60 | /* flags preserved across unprep / reprep */ |
aaff5eba | 61 | #define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED) |
125c99bc | 62 | |
f1342709 | 63 | /* for scmd->state */ |
29cadd2b | 64 | #define SCMD_STATE_COMPLETE 0 |
6eb045e0 | 65 | #define SCMD_STATE_INFLIGHT 1 |
f1342709 | 66 | |
bf23e619 BVA |
67 | enum scsi_cmnd_submitter { |
68 | SUBMITTED_BY_BLOCK_LAYER = 0, | |
69 | SUBMITTED_BY_SCSI_ERROR_HANDLER = 1, | |
70 | SUBMITTED_BY_SCSI_RESET_IOCTL = 2, | |
71 | } __packed; | |
72 | ||
1da177e4 | 73 | struct scsi_cmnd { |
82ed4db4 | 74 | struct scsi_request req; |
1da177e4 | 75 | struct scsi_device *device; |
1da177e4 | 76 | struct list_head eh_entry; /* entry for the host eh_cmd_q */ |
e494f6a7 | 77 | struct delayed_work abort_work; |
3be8828f BVA |
78 | |
79 | struct rcu_head rcu; | |
80 | ||
1da177e4 | 81 | int eh_eflags; /* Used by error handlr */ |
1da177e4 | 82 | |
d022d18c ML |
83 | int budget_token; |
84 | ||
b21a4138 JB |
85 | /* |
86 | * This is set to jiffies as it was when the command was first | |
87 | * allocated. It is used to time how long the command has | |
88 | * been outstanding | |
89 | */ | |
90 | unsigned long jiffies_at_alloc; | |
1da177e4 LT |
91 | |
92 | int retries; | |
93 | int allowed; | |
1da177e4 | 94 | |
db007fc5 MP |
95 | unsigned char prot_op; |
96 | unsigned char prot_type; | |
c611529e | 97 | unsigned char prot_flags; |
bf23e619 | 98 | enum scsi_cmnd_submitter submitter; |
db007fc5 | 99 | |
db4742dd | 100 | unsigned short cmd_len; |
1da177e4 | 101 | enum dma_data_direction sc_data_direction; |
1da177e4 LT |
102 | |
103 | /* These elements define the operation we are about to perform */ | |
64a87b24 | 104 | unsigned char *cmnd; |
1da177e4 | 105 | |
1da177e4 LT |
106 | |
107 | /* These elements define the operation we ultimately want to perform */ | |
30b0c37b | 108 | struct scsi_data_buffer sdb; |
7027ad72 MP |
109 | struct scsi_data_buffer *prot_sdb; |
110 | ||
1da177e4 LT |
111 | unsigned underflow; /* Return error if less than |
112 | this amount is transferred */ | |
1da177e4 LT |
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 | ||
de25deb1 | 120 | unsigned char *sense_buffer; |
c67a848c MW |
121 | /* obtained by REQUEST SENSE when |
122 | * CHECK CONDITION is received on original | |
704f8392 KC |
123 | * command (auto-sense). Length must be |
124 | * SCSI_SENSE_BUFFERSIZE bytes. */ | |
1da177e4 | 125 | |
1da177e4 LT |
126 | /* |
127 | * The following fields can be written to by the host specific code. | |
128 | * Everything else should be left alone. | |
129 | */ | |
130 | struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ | |
131 | ||
132 | unsigned char *host_scribble; /* The host adapter is allowed to | |
c67a848c MW |
133 | * call scsi_malloc and get some memory |
134 | * and hang it here. The host adapter | |
135 | * is also expected to call scsi_free | |
136 | * to release this memory. (The memory | |
137 | * obtained by scsi_malloc is guaranteed | |
138 | * to be at an address < 16Mb). */ | |
1da177e4 LT |
139 | |
140 | int result; /* Status code from lower level driver */ | |
125c99bc | 141 | int flags; /* Command flags */ |
f1342709 | 142 | unsigned long state; /* Command completion state */ |
1da177e4 | 143 | |
bdf8710d | 144 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 LT |
145 | }; |
146 | ||
51f3a478 BVA |
147 | /* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */ |
148 | static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd) | |
149 | { | |
150 | return blk_mq_rq_from_pdu(scmd); | |
151 | } | |
152 | ||
b54197c4 CH |
153 | /* |
154 | * Return the driver private allocation behind the command. | |
155 | * Only works if cmd_size is set in the host template. | |
156 | */ | |
157 | static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) | |
158 | { | |
159 | return cmd + 1; | |
160 | } | |
161 | ||
57292b58 | 162 | /* make sure not to use it with passthrough commands */ |
18a4d0a2 MP |
163 | static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) |
164 | { | |
aa8e25e5 BVA |
165 | struct request *rq = scsi_cmd_to_rq(cmd); |
166 | ||
167 | return *(struct scsi_driver **)rq->rq_disk->private_data; | |
18a4d0a2 MP |
168 | } |
169 | ||
a710eacb BVA |
170 | void scsi_done(struct scsi_cmnd *cmd); |
171 | ||
1da177e4 LT |
172 | extern void scsi_finish_command(struct scsi_cmnd *cmd); |
173 | ||
cdb8c2a6 GL |
174 | extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, |
175 | size_t *offset, size_t *len); | |
176 | extern void scsi_kunmap_atomic_sg(void *virt); | |
177 | ||
7007e9dd CH |
178 | blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd); |
179 | void scsi_free_sgtables(struct scsi_cmnd *cmd); | |
b58d9154 | 180 | |
bff739b6 | 181 | #ifdef CONFIG_SCSI_DMA |
824d7b57 FT |
182 | extern int scsi_dma_map(struct scsi_cmnd *cmd); |
183 | extern void scsi_dma_unmap(struct scsi_cmnd *cmd); | |
bff739b6 GU |
184 | #else /* !CONFIG_SCSI_DMA */ |
185 | static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; } | |
186 | static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { } | |
187 | #endif /* !CONFIG_SCSI_DMA */ | |
824d7b57 | 188 | |
30b0c37b BH |
189 | static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) |
190 | { | |
191 | return cmd->sdb.table.nents; | |
192 | } | |
193 | ||
194 | static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) | |
195 | { | |
196 | return cmd->sdb.table.sgl; | |
197 | } | |
198 | ||
199 | static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) | |
200 | { | |
201 | return cmd->sdb.length; | |
202 | } | |
824d7b57 | 203 | |
9237f04e | 204 | static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid) |
824d7b57 | 205 | { |
9fa505ad | 206 | cmd->req.resid_len = resid; |
824d7b57 FT |
207 | } |
208 | ||
9237f04e | 209 | static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd) |
824d7b57 | 210 | { |
9fa505ad | 211 | return cmd->req.resid_len; |
824d7b57 FT |
212 | } |
213 | ||
214 | #define scsi_for_each_sg(cmd, sg, nseg, __i) \ | |
c6132da1 | 215 | for_each_sg(scsi_sglist(cmd), sg, nseg, __i) |
824d7b57 | 216 | |
9ac16b61 FT |
217 | static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, |
218 | void *buf, int buflen) | |
219 | { | |
220 | return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), | |
221 | buf, buflen); | |
222 | } | |
223 | ||
224 | static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, | |
225 | void *buf, int buflen) | |
226 | { | |
227 | return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), | |
228 | buf, buflen); | |
229 | } | |
230 | ||
f0f214fe BVA |
231 | static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd) |
232 | { | |
aa8e25e5 | 233 | return blk_rq_pos(scsi_cmd_to_rq(scmd)); |
f0f214fe BVA |
234 | } |
235 | ||
d2c945f0 MP |
236 | static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) |
237 | { | |
238 | unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT; | |
239 | ||
aa8e25e5 | 240 | return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift; |
d2c945f0 MP |
241 | } |
242 | ||
6a20e21a MP |
243 | static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd) |
244 | { | |
245 | unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT; | |
246 | ||
247 | return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift; | |
248 | } | |
249 | ||
db007fc5 MP |
250 | /* |
251 | * The operations below are hints that tell the controller driver how | |
252 | * to handle I/Os with DIF or similar types of protection information. | |
253 | */ | |
254 | enum scsi_prot_operations { | |
255 | /* Normal I/O */ | |
256 | SCSI_PROT_NORMAL = 0, | |
257 | ||
258 | /* OS-HBA: Protected, HBA-Target: Unprotected */ | |
259 | SCSI_PROT_READ_INSERT, | |
260 | SCSI_PROT_WRITE_STRIP, | |
261 | ||
262 | /* OS-HBA: Unprotected, HBA-Target: Protected */ | |
263 | SCSI_PROT_READ_STRIP, | |
264 | SCSI_PROT_WRITE_INSERT, | |
265 | ||
266 | /* OS-HBA: Protected, HBA-Target: Protected */ | |
267 | SCSI_PROT_READ_PASS, | |
268 | SCSI_PROT_WRITE_PASS, | |
db007fc5 MP |
269 | }; |
270 | ||
271 | static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) | |
272 | { | |
273 | scmd->prot_op = op; | |
274 | } | |
275 | ||
276 | static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) | |
277 | { | |
278 | return scmd->prot_op; | |
279 | } | |
280 | ||
c611529e MP |
281 | enum scsi_prot_flags { |
282 | SCSI_PROT_TRANSFER_PI = 1 << 0, | |
283 | SCSI_PROT_GUARD_CHECK = 1 << 1, | |
284 | SCSI_PROT_REF_CHECK = 1 << 2, | |
285 | SCSI_PROT_REF_INCREMENT = 1 << 3, | |
286 | SCSI_PROT_IP_CHECKSUM = 1 << 4, | |
287 | }; | |
288 | ||
db007fc5 MP |
289 | /* |
290 | * The controller usually does not know anything about the target it | |
291 | * is communicating with. However, when DIX is enabled the controller | |
292 | * must be know target type so it can verify the protection | |
293 | * information passed along with the I/O. | |
294 | */ | |
295 | enum scsi_prot_target_type { | |
296 | SCSI_PROT_DIF_TYPE0 = 0, | |
297 | SCSI_PROT_DIF_TYPE1, | |
298 | SCSI_PROT_DIF_TYPE2, | |
299 | SCSI_PROT_DIF_TYPE3, | |
300 | }; | |
301 | ||
302 | static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) | |
303 | { | |
304 | scmd->prot_type = type; | |
305 | } | |
306 | ||
307 | static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) | |
308 | { | |
309 | return scmd->prot_type; | |
310 | } | |
311 | ||
7ba46799 MP |
312 | static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd) |
313 | { | |
314 | struct request *rq = blk_mq_rq_from_pdu(scmd); | |
315 | ||
316 | return t10_pi_ref_tag(rq); | |
317 | } | |
318 | ||
c611529e MP |
319 | static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) |
320 | { | |
321 | return scmd->device->sector_size; | |
322 | } | |
323 | ||
7027ad72 MP |
324 | static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) |
325 | { | |
326 | return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; | |
327 | } | |
328 | ||
329 | static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) | |
330 | { | |
331 | return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; | |
332 | } | |
333 | ||
334 | static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) | |
335 | { | |
336 | return cmd->prot_sdb; | |
337 | } | |
338 | ||
339 | #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ | |
340 | for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) | |
341 | ||
d37932a9 HR |
342 | static inline void set_status_byte(struct scsi_cmnd *cmd, char status) |
343 | { | |
344 | cmd->result = (cmd->result & 0xffffff00) | status; | |
345 | } | |
346 | ||
f6b5a697 HR |
347 | static inline u8 get_status_byte(struct scsi_cmnd *cmd) |
348 | { | |
349 | return cmd->result & 0xff; | |
350 | } | |
351 | ||
f290f197 JB |
352 | static inline void set_host_byte(struct scsi_cmnd *cmd, char status) |
353 | { | |
3384db9e | 354 | cmd->result = (cmd->result & 0xff00ffff) | (status << 16); |
f290f197 JB |
355 | } |
356 | ||
f6b5a697 HR |
357 | static inline u8 get_host_byte(struct scsi_cmnd *cmd) |
358 | { | |
359 | return (cmd->result >> 16) & 0xff; | |
360 | } | |
361 | ||
735b830c HR |
362 | /** |
363 | * scsi_msg_to_host_byte() - translate message byte | |
364 | * | |
365 | * Translate the SCSI parallel message byte to a matching | |
366 | * host byte setting. A message of COMMAND_COMPLETE indicates | |
367 | * a successful command execution, any other message indicate | |
368 | * an error. As the messages themselves only have a meaning | |
369 | * for the SCSI parallel protocol this function translates | |
370 | * them into a matching host byte value for SCSI EH. | |
371 | */ | |
372 | static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg) | |
373 | { | |
374 | switch (msg) { | |
375 | case COMMAND_COMPLETE: | |
376 | break; | |
377 | case ABORT_TASK_SET: | |
378 | set_host_byte(cmd, DID_ABORT); | |
379 | break; | |
380 | case TARGET_RESET: | |
381 | set_host_byte(cmd, DID_RESET); | |
382 | break; | |
383 | default: | |
384 | set_host_byte(cmd, DID_ERROR); | |
385 | break; | |
386 | } | |
387 | } | |
f290f197 | 388 | |
8846bab1 SG |
389 | static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd) |
390 | { | |
ae3d56d8 | 391 | unsigned int xfer_len = scmd->sdb.length; |
c611529e | 392 | unsigned int prot_interval = scsi_prot_interval(scmd); |
8846bab1 | 393 | |
c611529e MP |
394 | if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) |
395 | xfer_len += (xfer_len >> ilog2(prot_interval)) * 8; | |
8846bab1 | 396 | |
c611529e | 397 | return xfer_len; |
8846bab1 SG |
398 | } |
399 | ||
f2b1e9c6 HR |
400 | extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc, |
401 | u8 key, u8 asc, u8 ascq); | |
402 | ||
1da177e4 | 403 | #endif /* _SCSI_SCSI_CMND_H */ |