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 14 struct Scsi_Host; 15 16 /* 17 * MAX_COMMAND_SIZE is: 18 * The longest fixed-length SCSI CDB as per the SCSI standard. 19 * fixed-length means: commands that their size can be determined 20 * by their opcode and the CDB does not carry a length specifier, (unlike 21 * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly 22 * true and the SCSI standard also defines extended commands and 23 * vendor specific commands that can be bigger than 16 bytes. The kernel 24 * will support these using the same infrastructure used for VARLEN CDB's. 25 * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml 26 * supports without specifying a cmd_len by ULD's 27 */ 28 #define MAX_COMMAND_SIZE 16 29 30 struct scsi_data_buffer { 31 struct sg_table table; 32 unsigned length; 33 }; 34 35 /* embedded in scsi_cmnd */ 36 struct scsi_pointer { 37 char *ptr; /* data pointer */ 38 int this_residual; /* left in this buffer */ 39 struct scatterlist *buffer; /* which buffer */ 40 int buffers_residual; /* how many buffers left */ 41 42 dma_addr_t dma_handle; 43 44 volatile int Status; 45 volatile int Message; 46 volatile int have_data_in; 47 volatile int sent_command; 48 volatile int phase; 49 }; 50 51 /* for scmd->flags */ 52 #define SCMD_TAGGED (1 << 0) 53 #define SCMD_INITIALIZED (1 << 1) 54 #define SCMD_LAST (1 << 2) 55 /* flags preserved across unprep / reprep */ 56 #define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED) 57 58 /* for scmd->state */ 59 #define SCMD_STATE_COMPLETE 0 60 #define SCMD_STATE_INFLIGHT 1 61 62 enum scsi_cmnd_submitter { 63 SUBMITTED_BY_BLOCK_LAYER = 0, 64 SUBMITTED_BY_SCSI_ERROR_HANDLER = 1, 65 SUBMITTED_BY_SCSI_RESET_IOCTL = 2, 66 } __packed; 67 68 struct scsi_cmnd { 69 struct scsi_device *device; 70 struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */ 71 struct delayed_work abort_work; 72 73 struct rcu_head rcu; 74 75 int eh_eflags; /* Used by error handlr */ 76 77 int budget_token; 78 79 /* 80 * This is set to jiffies as it was when the command was first 81 * allocated. It is used to time how long the command has 82 * been outstanding 83 */ 84 unsigned long jiffies_at_alloc; 85 86 int retries; 87 int allowed; 88 89 unsigned char prot_op; 90 unsigned char prot_type; 91 unsigned char prot_flags; 92 enum scsi_cmnd_submitter submitter; 93 94 unsigned short cmd_len; 95 enum dma_data_direction sc_data_direction; 96 97 unsigned char cmnd[32]; /* SCSI CDB */ 98 99 /* These elements define the operation we ultimately want to perform */ 100 struct scsi_data_buffer sdb; 101 struct scsi_data_buffer *prot_sdb; 102 103 unsigned underflow; /* Return error if less than 104 this amount is transferred */ 105 106 unsigned transfersize; /* How much we are guaranteed to 107 transfer with each SCSI transfer 108 (ie, between disconnect / 109 reconnects. Probably == sector 110 size */ 111 unsigned resid_len; /* residual count */ 112 unsigned sense_len; 113 unsigned char *sense_buffer; 114 /* obtained by REQUEST SENSE when 115 * CHECK CONDITION is received on original 116 * command (auto-sense). Length must be 117 * SCSI_SENSE_BUFFERSIZE bytes. */ 118 119 int flags; /* Command flags */ 120 unsigned long state; /* Command completion state */ 121 122 unsigned int extra_len; /* length of alignment and padding */ 123 124 /* 125 * The fields below can be modified by the LLD but the fields above 126 * must not be modified. 127 */ 128 129 unsigned char *host_scribble; /* The host adapter is allowed to 130 * call scsi_malloc and get some memory 131 * and hang it here. The host adapter 132 * is also expected to call scsi_free 133 * to release this memory. (The memory 134 * obtained by scsi_malloc is guaranteed 135 * to be at an address < 16Mb). */ 136 137 int result; /* Status code from lower level driver */ 138 }; 139 140 /* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */ 141 static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd) 142 { 143 return blk_mq_rq_from_pdu(scmd); 144 } 145 146 /* 147 * Return the driver private allocation behind the command. 148 * Only works if cmd_size is set in the host template. 149 */ 150 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) 151 { 152 return cmd + 1; 153 } 154 155 void scsi_done(struct scsi_cmnd *cmd); 156 void scsi_done_direct(struct scsi_cmnd *cmd); 157 158 extern void scsi_finish_command(struct scsi_cmnd *cmd); 159 160 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 161 size_t *offset, size_t *len); 162 extern void scsi_kunmap_atomic_sg(void *virt); 163 164 blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd); 165 void scsi_free_sgtables(struct scsi_cmnd *cmd); 166 167 #ifdef CONFIG_SCSI_DMA 168 extern int scsi_dma_map(struct scsi_cmnd *cmd); 169 extern void scsi_dma_unmap(struct scsi_cmnd *cmd); 170 #else /* !CONFIG_SCSI_DMA */ 171 static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; } 172 static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { } 173 #endif /* !CONFIG_SCSI_DMA */ 174 175 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) 176 { 177 return cmd->sdb.table.nents; 178 } 179 180 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) 181 { 182 return cmd->sdb.table.sgl; 183 } 184 185 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) 186 { 187 return cmd->sdb.length; 188 } 189 190 static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid) 191 { 192 cmd->resid_len = resid; 193 } 194 195 static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd) 196 { 197 return cmd->resid_len; 198 } 199 200 #define scsi_for_each_sg(cmd, sg, nseg, __i) \ 201 for_each_sg(scsi_sglist(cmd), sg, nseg, __i) 202 203 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, 204 void *buf, int buflen) 205 { 206 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 207 buf, buflen); 208 } 209 210 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, 211 void *buf, int buflen) 212 { 213 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 214 buf, buflen); 215 } 216 217 static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd) 218 { 219 return blk_rq_pos(scsi_cmd_to_rq(scmd)); 220 } 221 222 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) 223 { 224 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT; 225 226 return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift; 227 } 228 229 static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd) 230 { 231 unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT; 232 233 return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift; 234 } 235 236 /* 237 * The operations below are hints that tell the controller driver how 238 * to handle I/Os with DIF or similar types of protection information. 239 */ 240 enum scsi_prot_operations { 241 /* Normal I/O */ 242 SCSI_PROT_NORMAL = 0, 243 244 /* OS-HBA: Protected, HBA-Target: Unprotected */ 245 SCSI_PROT_READ_INSERT, 246 SCSI_PROT_WRITE_STRIP, 247 248 /* OS-HBA: Unprotected, HBA-Target: Protected */ 249 SCSI_PROT_READ_STRIP, 250 SCSI_PROT_WRITE_INSERT, 251 252 /* OS-HBA: Protected, HBA-Target: Protected */ 253 SCSI_PROT_READ_PASS, 254 SCSI_PROT_WRITE_PASS, 255 }; 256 257 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) 258 { 259 scmd->prot_op = op; 260 } 261 262 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) 263 { 264 return scmd->prot_op; 265 } 266 267 enum scsi_prot_flags { 268 SCSI_PROT_TRANSFER_PI = 1 << 0, 269 SCSI_PROT_GUARD_CHECK = 1 << 1, 270 SCSI_PROT_REF_CHECK = 1 << 2, 271 SCSI_PROT_REF_INCREMENT = 1 << 3, 272 SCSI_PROT_IP_CHECKSUM = 1 << 4, 273 }; 274 275 /* 276 * The controller usually does not know anything about the target it 277 * is communicating with. However, when DIX is enabled the controller 278 * must be know target type so it can verify the protection 279 * information passed along with the I/O. 280 */ 281 enum scsi_prot_target_type { 282 SCSI_PROT_DIF_TYPE0 = 0, 283 SCSI_PROT_DIF_TYPE1, 284 SCSI_PROT_DIF_TYPE2, 285 SCSI_PROT_DIF_TYPE3, 286 }; 287 288 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) 289 { 290 scmd->prot_type = type; 291 } 292 293 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) 294 { 295 return scmd->prot_type; 296 } 297 298 static inline u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd) 299 { 300 struct request *rq = blk_mq_rq_from_pdu(scmd); 301 302 return t10_pi_ref_tag(rq); 303 } 304 305 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) 306 { 307 return scmd->device->sector_size; 308 } 309 310 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) 311 { 312 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; 313 } 314 315 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) 316 { 317 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; 318 } 319 320 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) 321 { 322 return cmd->prot_sdb; 323 } 324 325 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ 326 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) 327 328 static inline void set_status_byte(struct scsi_cmnd *cmd, char status) 329 { 330 cmd->result = (cmd->result & 0xffffff00) | status; 331 } 332 333 static inline u8 get_status_byte(struct scsi_cmnd *cmd) 334 { 335 return cmd->result & 0xff; 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 u8 get_host_byte(struct scsi_cmnd *cmd) 344 { 345 return (cmd->result >> 16) & 0xff; 346 } 347 348 /** 349 * scsi_msg_to_host_byte() - translate message byte 350 * 351 * Translate the SCSI parallel message byte to a matching 352 * host byte setting. A message of COMMAND_COMPLETE indicates 353 * a successful command execution, any other message indicate 354 * an error. As the messages themselves only have a meaning 355 * for the SCSI parallel protocol this function translates 356 * them into a matching host byte value for SCSI EH. 357 */ 358 static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg) 359 { 360 switch (msg) { 361 case COMMAND_COMPLETE: 362 break; 363 case ABORT_TASK_SET: 364 set_host_byte(cmd, DID_ABORT); 365 break; 366 case TARGET_RESET: 367 set_host_byte(cmd, DID_RESET); 368 break; 369 default: 370 set_host_byte(cmd, DID_ERROR); 371 break; 372 } 373 } 374 375 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd) 376 { 377 unsigned int xfer_len = scmd->sdb.length; 378 unsigned int prot_interval = scsi_prot_interval(scmd); 379 380 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) 381 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8; 382 383 return xfer_len; 384 } 385 386 extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc, 387 u8 key, u8 asc, u8 ascq); 388 389 struct request *scsi_alloc_request(struct request_queue *q, 390 unsigned int op, blk_mq_req_flags_t flags); 391 392 #endif /* _SCSI_SCSI_CMND_H */ 393