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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#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;
13struct scsi_driver;
14
15/*
16 * MAX_COMMAND_SIZE is:
17 * The longest fixed-length SCSI CDB as per the SCSI standard.
18 * fixed-length means: commands that their size can be determined
19 * by their opcode and the CDB does not carry a length specifier, (unlike
20 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly
21 * true and the SCSI standard also defines extended commands and
22 * vendor specific commands that can be bigger than 16 bytes. The kernel
23 * will support these using the same infrastructure used for VARLEN CDB's.
24 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml
25 * supports without specifying a cmd_len by ULD's
26 */
27#define MAX_COMMAND_SIZE 16
28#if (MAX_COMMAND_SIZE > BLK_MAX_CDB)
29# error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB
30#endif
31
32struct scsi_data_buffer {
33 struct sg_table table;
34 unsigned length;
35 int resid;
36};
37
38/* embedded in scsi_cmnd */
39struct scsi_pointer {
40 char *ptr; /* data pointer */
41 int this_residual; /* left in this buffer */
42 struct scatterlist *buffer; /* which buffer */
43 int buffers_residual; /* how many buffers left */
44
45 dma_addr_t dma_handle;
46
47 volatile int Status;
48 volatile int Message;
49 volatile int have_data_in;
50 volatile int sent_command;
51 volatile int phase;
52};
53
54struct scsi_cmnd {
55 struct scsi_device *device;
56 struct list_head list; /* scsi_cmnd participates in queue lists */
57 struct list_head eh_entry; /* entry for the host eh_cmd_q */
58 int eh_eflags; /* Used by error handlr */
59
60 /*
61 * A SCSI Command is assigned a nonzero serial_number before passed
62 * to the driver's queue command function. The serial_number is
63 * cleared when scsi_done is entered indicating that the command
64 * has been completed. It is a bug for LLDDs to use this number
65 * for purposes other than printk (and even that is only useful
66 * for debugging).
67 */
68 unsigned long serial_number;
69
70 /*
71 * This is set to jiffies as it was when the command was first
72 * allocated. It is used to time how long the command has
73 * been outstanding
74 */
75 unsigned long jiffies_at_alloc;
76
77 int retries;
78 int allowed;
79
80 unsigned char prot_op;
81 unsigned char prot_type;
82
83 unsigned short cmd_len;
84 enum dma_data_direction sc_data_direction;
85
86 /* These elements define the operation we are about to perform */
87 unsigned char *cmnd;
88
89
90 /* These elements define the operation we ultimately want to perform */
91 struct scsi_data_buffer sdb;
92 struct scsi_data_buffer *prot_sdb;
93
94 unsigned underflow; /* Return error if less than
95 this amount is transferred */
96
97 unsigned transfersize; /* How much we are guaranteed to
98 transfer with each SCSI transfer
99 (ie, between disconnect /
100 reconnects. Probably == sector
101 size */
102
103 struct request *request; /* The command we are
104 working on */
105
106#define SCSI_SENSE_BUFFERSIZE 96
107 unsigned char *sense_buffer;
108 /* obtained by REQUEST SENSE when
109 * CHECK CONDITION is received on original
110 * command (auto-sense) */
111
112 /* Low-level done function - can be used by low-level driver to point
113 * to completion function. Not used by mid/upper level code. */
114 void (*scsi_done) (struct scsi_cmnd *);
115
116 /*
117 * The following fields can be written to by the host specific code.
118 * Everything else should be left alone.
119 */
120 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */
121
122 unsigned char *host_scribble; /* The host adapter is allowed to
123 * call scsi_malloc and get some memory
124 * and hang it here. The host adapter
125 * is also expected to call scsi_free
126 * to release this memory. (The memory
127 * obtained by scsi_malloc is guaranteed
128 * to be at an address < 16Mb). */
129
130 int result; /* Status code from lower level driver */
131
132 unsigned char tag; /* SCSI-II queued command tag */
133};
134
135static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
136{
137 struct scsi_driver **sdp;
138
139 if (!cmd->request->rq_disk)
140 return NULL;
141
142 sdp = (struct scsi_driver **)cmd->request->rq_disk->private_data;
143 if (!sdp)
144 return NULL;
145
146 return *sdp;
147}
148
149extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
150extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t);
151extern void scsi_put_command(struct scsi_cmnd *);
152extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *,
153 struct device *);
154extern void scsi_finish_command(struct scsi_cmnd *cmd);
155
156extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count,
157 size_t *offset, size_t *len);
158extern void scsi_kunmap_atomic_sg(void *virt);
159
160extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask);
161extern void scsi_release_buffers(struct scsi_cmnd *cmd);
162
163extern int scsi_dma_map(struct scsi_cmnd *cmd);
164extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
165
166struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask);
167void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd);
168
169static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd)
170{
171 return cmd->sdb.table.nents;
172}
173
174static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd)
175{
176 return cmd->sdb.table.sgl;
177}
178
179static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd)
180{
181 return cmd->sdb.length;
182}
183
184static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid)
185{
186 cmd->sdb.resid = resid;
187}
188
189static inline int scsi_get_resid(struct scsi_cmnd *cmd)
190{
191 return cmd->sdb.resid;
192}
193
194#define scsi_for_each_sg(cmd, sg, nseg, __i) \
195 for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
196
197static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
198{
199 return blk_bidi_rq(cmd->request) &&
200 (cmd->request->next_rq->special != NULL);
201}
202
203static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
204{
205 return scsi_bidi_cmnd(cmd) ?
206 cmd->request->next_rq->special : &cmd->sdb;
207}
208
209static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
210{
211 return &cmd->sdb;
212}
213
214static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd,
215 void *buf, int buflen)
216{
217 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
218 buf, buflen);
219}
220
221static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd,
222 void *buf, int buflen)
223{
224 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
225 buf, buflen);
226}
227
228/*
229 * The operations below are hints that tell the controller driver how
230 * to handle I/Os with DIF or similar types of protection information.
231 */
232enum scsi_prot_operations {
233 /* Normal I/O */
234 SCSI_PROT_NORMAL = 0,
235
236 /* OS-HBA: Protected, HBA-Target: Unprotected */
237 SCSI_PROT_READ_INSERT,
238 SCSI_PROT_WRITE_STRIP,
239
240 /* OS-HBA: Unprotected, HBA-Target: Protected */
241 SCSI_PROT_READ_STRIP,
242 SCSI_PROT_WRITE_INSERT,
243
244 /* OS-HBA: Protected, HBA-Target: Protected */
245 SCSI_PROT_READ_PASS,
246 SCSI_PROT_WRITE_PASS,
247};
248
249static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op)
250{
251 scmd->prot_op = op;
252}
253
254static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd)
255{
256 return scmd->prot_op;
257}
258
259/*
260 * The controller usually does not know anything about the target it
261 * is communicating with. However, when DIX is enabled the controller
262 * must be know target type so it can verify the protection
263 * information passed along with the I/O.
264 */
265enum scsi_prot_target_type {
266 SCSI_PROT_DIF_TYPE0 = 0,
267 SCSI_PROT_DIF_TYPE1,
268 SCSI_PROT_DIF_TYPE2,
269 SCSI_PROT_DIF_TYPE3,
270};
271
272static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type)
273{
274 scmd->prot_type = type;
275}
276
277static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd)
278{
279 return scmd->prot_type;
280}
281
282static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
283{
284 return blk_rq_pos(scmd->request);
285}
286
287static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd)
288{
289 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0;
290}
291
292static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd)
293{
294 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL;
295}
296
297static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd)
298{
299 return cmd->prot_sdb;
300}
301
302#define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \
303 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i)
304
305static inline void set_msg_byte(struct scsi_cmnd *cmd, char status)
306{
307 cmd->result = (cmd->result & 0xffff00ff) | (status << 8);
308}
309
310static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
311{
312 cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
313}
314
315static inline void set_driver_byte(struct scsi_cmnd *cmd, char status)
316{
317 cmd->result = (cmd->result & 0x00ffffff) | (status << 24);
318}
319
320#endif /* _SCSI_SCSI_CMND_H */