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