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 #include <scsi/scsi_device.h> 11 #include <scsi/scsi_request.h> 12 13 struct Scsi_Host; 14 struct scsi_driver; 15 16 #include <scsi/scsi_device.h> 17 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 35 struct scsi_data_buffer { 36 struct sg_table table; 37 unsigned length; 38 int resid; 39 }; 40 41 /* embedded in scsi_cmnd */ 42 struct 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_UNCHECKED_ISA_DMA (1 << 1) 60 #define SCMD_ZONE_WRITE_LOCK (1 << 2) 61 #define SCMD_INITIALIZED (1 << 3) 62 /* flags preserved across unprep / reprep */ 63 #define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED) 64 65 struct 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 int eh_eflags; /* Used by error handlr */ 72 73 /* 74 * A SCSI Command is assigned a nonzero serial_number before passed 75 * to the driver's queue command function. The serial_number is 76 * cleared when scsi_done is entered indicating that the command 77 * has been completed. It is a bug for LLDDs to use this number 78 * for purposes other than printk (and even that is only useful 79 * for debugging). 80 */ 81 unsigned long serial_number; 82 83 /* 84 * This is set to jiffies as it was when the command was first 85 * allocated. It is used to time how long the command has 86 * been outstanding 87 */ 88 unsigned long jiffies_at_alloc; 89 90 int retries; 91 int allowed; 92 93 unsigned char prot_op; 94 unsigned char prot_type; 95 unsigned char prot_flags; 96 97 unsigned short cmd_len; 98 enum dma_data_direction sc_data_direction; 99 100 /* These elements define the operation we are about to perform */ 101 unsigned char *cmnd; 102 103 104 /* These elements define the operation we ultimately want to perform */ 105 struct scsi_data_buffer sdb; 106 struct scsi_data_buffer *prot_sdb; 107 108 unsigned underflow; /* Return error if less than 109 this amount is transferred */ 110 111 unsigned transfersize; /* How much we are guaranteed to 112 transfer with each SCSI transfer 113 (ie, between disconnect / 114 reconnects. Probably == sector 115 size */ 116 117 struct request *request; /* The command we are 118 working on */ 119 120 #define SCSI_SENSE_BUFFERSIZE 96 121 unsigned char *sense_buffer; 122 /* obtained by REQUEST SENSE when 123 * CHECK CONDITION is received on original 124 * command (auto-sense) */ 125 126 /* Low-level done function - can be used by low-level driver to point 127 * to completion function. Not used by mid/upper level code. */ 128 void (*scsi_done) (struct scsi_cmnd *); 129 130 /* 131 * The following fields can be written to by the host specific code. 132 * Everything else should be left alone. 133 */ 134 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 135 136 unsigned char *host_scribble; /* The host adapter is allowed to 137 * call scsi_malloc and get some memory 138 * and hang it here. The host adapter 139 * is also expected to call scsi_free 140 * to release this memory. (The memory 141 * obtained by scsi_malloc is guaranteed 142 * to be at an address < 16Mb). */ 143 144 int result; /* Status code from lower level driver */ 145 int flags; /* Command flags */ 146 147 unsigned char tag; /* SCSI-II queued command tag */ 148 }; 149 150 /* 151 * Return the driver private allocation behind the command. 152 * Only works if cmd_size is set in the host template. 153 */ 154 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) 155 { 156 return cmd + 1; 157 } 158 159 /* make sure not to use it with passthrough commands */ 160 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) 161 { 162 return *(struct scsi_driver **)cmd->request->rq_disk->private_data; 163 } 164 165 extern void scsi_put_command(struct scsi_cmnd *); 166 extern void scsi_finish_command(struct scsi_cmnd *cmd); 167 168 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 169 size_t *offset, size_t *len); 170 extern void scsi_kunmap_atomic_sg(void *virt); 171 172 extern int scsi_init_io(struct scsi_cmnd *cmd); 173 extern void scsi_initialize_rq(struct request *rq); 174 175 extern int scsi_dma_map(struct scsi_cmnd *cmd); 176 extern void scsi_dma_unmap(struct scsi_cmnd *cmd); 177 178 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) 179 { 180 return cmd->sdb.table.nents; 181 } 182 183 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) 184 { 185 return cmd->sdb.table.sgl; 186 } 187 188 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) 189 { 190 return cmd->sdb.length; 191 } 192 193 static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) 194 { 195 cmd->sdb.resid = resid; 196 } 197 198 static inline int scsi_get_resid(struct scsi_cmnd *cmd) 199 { 200 return cmd->sdb.resid; 201 } 202 203 #define scsi_for_each_sg(cmd, sg, nseg, __i) \ 204 for_each_sg(scsi_sglist(cmd), sg, nseg, __i) 205 206 static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd) 207 { 208 return blk_bidi_rq(cmd->request) && 209 (cmd->request->next_rq->special != NULL); 210 } 211 212 static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd) 213 { 214 return scsi_bidi_cmnd(cmd) ? 215 cmd->request->next_rq->special : &cmd->sdb; 216 } 217 218 static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd) 219 { 220 return &cmd->sdb; 221 } 222 223 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, 224 void *buf, int buflen) 225 { 226 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 227 buf, buflen); 228 } 229 230 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, 231 void *buf, int buflen) 232 { 233 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 234 buf, buflen); 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 */ 241 enum 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 }; 257 258 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) 259 { 260 scmd->prot_op = op; 261 } 262 263 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) 264 { 265 return scmd->prot_op; 266 } 267 268 enum 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 */ 282 enum 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 }; 288 289 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) 290 { 291 scmd->prot_type = type; 292 } 293 294 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) 295 { 296 return scmd->prot_type; 297 } 298 299 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) 300 { 301 return blk_rq_pos(scmd->request); 302 } 303 304 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) 305 { 306 return scmd->device->sector_size; 307 } 308 309 static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd) 310 { 311 return blk_rq_pos(scmd->request) >> 312 (ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff; 313 } 314 315 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) 316 { 317 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; 318 } 319 320 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) 321 { 322 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; 323 } 324 325 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) 326 { 327 return cmd->prot_sdb; 328 } 329 330 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ 331 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) 332 333 static inline void set_msg_byte(struct scsi_cmnd *cmd, char status) 334 { 335 cmd->result = (cmd->result & 0xffff00ff) | (status << 8); 336 } 337 338 static inline void set_host_byte(struct scsi_cmnd *cmd, char status) 339 { 340 cmd->result = (cmd->result & 0xff00ffff) | (status << 16); 341 } 342 343 static inline void set_driver_byte(struct scsi_cmnd *cmd, char status) 344 { 345 cmd->result = (cmd->result & 0x00ffffff) | (status << 24); 346 } 347 348 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd) 349 { 350 unsigned int xfer_len = scsi_out(scmd)->length; 351 unsigned int prot_interval = scsi_prot_interval(scmd); 352 353 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) 354 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8; 355 356 return xfer_len; 357 } 358 359 #endif /* _SCSI_SCSI_CMND_H */ 360