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1da177e4 LT |
1 | #ifndef _SCSI_SCSI_CMND_H |
2 | #define _SCSI_SCSI_CMND_H | |
3 | ||
4 | #include <linux/dma-mapping.h> | |
6f9a35e2 | 5 | #include <linux/blkdev.h> |
1da177e4 LT |
6 | #include <linux/list.h> |
7 | #include <linux/types.h> | |
4e57b681 | 8 | #include <linux/timer.h> |
c6132da1 | 9 | #include <linux/scatterlist.h> |
1da177e4 | 10 | |
b58d9154 | 11 | struct Scsi_Host; |
1da177e4 | 12 | struct scsi_device; |
18a4d0a2 | 13 | struct scsi_driver; |
1da177e4 | 14 | |
64a87b24 BH |
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 | ||
30b0c37b BH |
32 | struct scsi_data_buffer { |
33 | struct sg_table table; | |
34 | unsigned length; | |
35 | int resid; | |
36 | }; | |
1da177e4 LT |
37 | |
38 | /* embedded in scsi_cmnd */ | |
39 | struct 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 | ||
54 | struct scsi_cmnd { | |
1da177e4 | 55 | struct scsi_device *device; |
1da177e4 | 56 | struct list_head list; /* scsi_cmnd participates in queue lists */ |
1da177e4 | 57 | struct list_head eh_entry; /* entry for the host eh_cmd_q */ |
1da177e4 | 58 | int eh_eflags; /* Used by error handlr */ |
1da177e4 LT |
59 | |
60 | /* | |
c6295cdf | 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 | |
12a44162 MW |
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). | |
1da177e4 LT |
67 | */ |
68 | unsigned long serial_number; | |
12a44162 | 69 | |
b21a4138 JB |
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; | |
1da177e4 LT |
76 | |
77 | int retries; | |
78 | int allowed; | |
1da177e4 | 79 | |
db007fc5 MP |
80 | unsigned char prot_op; |
81 | unsigned char prot_type; | |
82 | ||
db4742dd | 83 | unsigned short cmd_len; |
1da177e4 | 84 | enum dma_data_direction sc_data_direction; |
1da177e4 LT |
85 | |
86 | /* These elements define the operation we are about to perform */ | |
64a87b24 | 87 | unsigned char *cmnd; |
1da177e4 | 88 | |
1da177e4 LT |
89 | |
90 | /* These elements define the operation we ultimately want to perform */ | |
30b0c37b | 91 | struct scsi_data_buffer sdb; |
7027ad72 MP |
92 | struct scsi_data_buffer *prot_sdb; |
93 | ||
1da177e4 LT |
94 | unsigned underflow; /* Return error if less than |
95 | this amount is transferred */ | |
1da177e4 LT |
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 | ||
1da177e4 LT |
103 | struct request *request; /* The command we are |
104 | working on */ | |
105 | ||
106 | #define SCSI_SENSE_BUFFERSIZE 96 | |
de25deb1 | 107 | unsigned char *sense_buffer; |
c67a848c MW |
108 | /* obtained by REQUEST SENSE when |
109 | * CHECK CONDITION is received on original | |
110 | * command (auto-sense) */ | |
1da177e4 LT |
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 | |
c67a848c MW |
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). */ | |
1da177e4 LT |
129 | |
130 | int result; /* Status code from lower level driver */ | |
131 | ||
132 | unsigned char tag; /* SCSI-II queued command tag */ | |
1da177e4 LT |
133 | }; |
134 | ||
18a4d0a2 MP |
135 | static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) |
136 | { | |
137 | return *(struct scsi_driver **)cmd->request->rq_disk->private_data; | |
138 | } | |
139 | ||
c53033f6 | 140 | extern struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t); |
b58d9154 | 141 | extern struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *, gfp_t); |
1da177e4 | 142 | extern void scsi_put_command(struct scsi_cmnd *); |
b58d9154 FT |
143 | extern void __scsi_put_command(struct Scsi_Host *, struct scsi_cmnd *, |
144 | struct device *); | |
1da177e4 LT |
145 | extern void scsi_finish_command(struct scsi_cmnd *cmd); |
146 | ||
cdb8c2a6 GL |
147 | extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, |
148 | size_t *offset, size_t *len); | |
149 | extern void scsi_kunmap_atomic_sg(void *virt); | |
150 | ||
bb52d82f BH |
151 | extern int scsi_init_io(struct scsi_cmnd *cmd, gfp_t gfp_mask); |
152 | extern void scsi_release_buffers(struct scsi_cmnd *cmd); | |
b58d9154 | 153 | |
824d7b57 FT |
154 | extern int scsi_dma_map(struct scsi_cmnd *cmd); |
155 | extern void scsi_dma_unmap(struct scsi_cmnd *cmd); | |
156 | ||
1c353f7d JB |
157 | struct scsi_cmnd *scsi_allocate_command(gfp_t gfp_mask); |
158 | void scsi_free_command(gfp_t gfp_mask, struct scsi_cmnd *cmd); | |
159 | ||
30b0c37b BH |
160 | static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) |
161 | { | |
162 | return cmd->sdb.table.nents; | |
163 | } | |
164 | ||
165 | static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) | |
166 | { | |
167 | return cmd->sdb.table.sgl; | |
168 | } | |
169 | ||
170 | static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) | |
171 | { | |
172 | return cmd->sdb.length; | |
173 | } | |
824d7b57 FT |
174 | |
175 | static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) | |
176 | { | |
30b0c37b | 177 | cmd->sdb.resid = resid; |
824d7b57 FT |
178 | } |
179 | ||
180 | static inline int scsi_get_resid(struct scsi_cmnd *cmd) | |
181 | { | |
30b0c37b | 182 | return cmd->sdb.resid; |
824d7b57 FT |
183 | } |
184 | ||
185 | #define scsi_for_each_sg(cmd, sg, nseg, __i) \ | |
c6132da1 | 186 | for_each_sg(scsi_sglist(cmd), sg, nseg, __i) |
824d7b57 | 187 | |
6f9a35e2 BH |
188 | static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd) |
189 | { | |
190 | return blk_bidi_rq(cmd->request) && | |
191 | (cmd->request->next_rq->special != NULL); | |
192 | } | |
193 | ||
194 | static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd) | |
195 | { | |
196 | return scsi_bidi_cmnd(cmd) ? | |
197 | cmd->request->next_rq->special : &cmd->sdb; | |
198 | } | |
199 | ||
200 | static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd) | |
201 | { | |
202 | return &cmd->sdb; | |
203 | } | |
204 | ||
9ac16b61 FT |
205 | static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, |
206 | void *buf, int buflen) | |
207 | { | |
208 | return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), | |
209 | buf, buflen); | |
210 | } | |
211 | ||
212 | static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, | |
213 | void *buf, int buflen) | |
214 | { | |
215 | return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), | |
216 | buf, buflen); | |
217 | } | |
218 | ||
db007fc5 MP |
219 | /* |
220 | * The operations below are hints that tell the controller driver how | |
221 | * to handle I/Os with DIF or similar types of protection information. | |
222 | */ | |
223 | enum scsi_prot_operations { | |
224 | /* Normal I/O */ | |
225 | SCSI_PROT_NORMAL = 0, | |
226 | ||
227 | /* OS-HBA: Protected, HBA-Target: Unprotected */ | |
228 | SCSI_PROT_READ_INSERT, | |
229 | SCSI_PROT_WRITE_STRIP, | |
230 | ||
231 | /* OS-HBA: Unprotected, HBA-Target: Protected */ | |
232 | SCSI_PROT_READ_STRIP, | |
233 | SCSI_PROT_WRITE_INSERT, | |
234 | ||
235 | /* OS-HBA: Protected, HBA-Target: Protected */ | |
236 | SCSI_PROT_READ_PASS, | |
237 | SCSI_PROT_WRITE_PASS, | |
db007fc5 MP |
238 | }; |
239 | ||
240 | static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) | |
241 | { | |
242 | scmd->prot_op = op; | |
243 | } | |
244 | ||
245 | static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) | |
246 | { | |
247 | return scmd->prot_op; | |
248 | } | |
249 | ||
250 | /* | |
251 | * The controller usually does not know anything about the target it | |
252 | * is communicating with. However, when DIX is enabled the controller | |
253 | * must be know target type so it can verify the protection | |
254 | * information passed along with the I/O. | |
255 | */ | |
256 | enum scsi_prot_target_type { | |
257 | SCSI_PROT_DIF_TYPE0 = 0, | |
258 | SCSI_PROT_DIF_TYPE1, | |
259 | SCSI_PROT_DIF_TYPE2, | |
260 | SCSI_PROT_DIF_TYPE3, | |
261 | }; | |
262 | ||
263 | static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) | |
264 | { | |
265 | scmd->prot_type = type; | |
266 | } | |
267 | ||
268 | static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) | |
269 | { | |
270 | return scmd->prot_type; | |
271 | } | |
272 | ||
273 | static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) | |
274 | { | |
83096ebf | 275 | return blk_rq_pos(scmd->request); |
db007fc5 MP |
276 | } |
277 | ||
7027ad72 MP |
278 | static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) |
279 | { | |
280 | return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; | |
281 | } | |
282 | ||
283 | static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) | |
284 | { | |
285 | return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; | |
286 | } | |
287 | ||
288 | static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) | |
289 | { | |
290 | return cmd->prot_sdb; | |
291 | } | |
292 | ||
293 | #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ | |
294 | for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) | |
295 | ||
f290f197 JB |
296 | static inline void set_msg_byte(struct scsi_cmnd *cmd, char status) |
297 | { | |
3384db9e | 298 | cmd->result = (cmd->result & 0xffff00ff) | (status << 8); |
f290f197 JB |
299 | } |
300 | ||
301 | static inline void set_host_byte(struct scsi_cmnd *cmd, char status) | |
302 | { | |
3384db9e | 303 | cmd->result = (cmd->result & 0xff00ffff) | (status << 16); |
f290f197 JB |
304 | } |
305 | ||
306 | static inline void set_driver_byte(struct scsi_cmnd *cmd, char status) | |
307 | { | |
3384db9e | 308 | cmd->result = (cmd->result & 0x00ffffff) | (status << 24); |
f290f197 JB |
309 | } |
310 | ||
1da177e4 | 311 | #endif /* _SCSI_SCSI_CMND_H */ |