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_request.h> 14 15 struct Scsi_Host; 16 struct scsi_driver; 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 }; 39 40 /* embedded in scsi_cmnd */ 41 struct scsi_pointer { 42 char *ptr; /* data pointer */ 43 int this_residual; /* left in this buffer */ 44 struct scatterlist *buffer; /* which buffer */ 45 int buffers_residual; /* how many buffers left */ 46 47 dma_addr_t dma_handle; 48 49 volatile int Status; 50 volatile int Message; 51 volatile int have_data_in; 52 volatile int sent_command; 53 volatile int phase; 54 }; 55 56 /* for scmd->flags */ 57 #define SCMD_TAGGED (1 << 0) 58 #define SCMD_UNCHECKED_ISA_DMA (1 << 1) 59 #define SCMD_INITIALIZED (1 << 2) 60 #define SCMD_LAST (1 << 3) 61 /* flags preserved across unprep / reprep */ 62 #define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED) 63 64 /* for scmd->state */ 65 #define SCMD_STATE_COMPLETE 0 66 #define SCMD_STATE_INFLIGHT 1 67 68 struct scsi_cmnd { 69 struct scsi_request req; 70 struct scsi_device *device; 71 struct list_head list; /* scsi_cmnd participates in queue lists */ 72 struct list_head eh_entry; /* entry for the host eh_cmd_q */ 73 struct delayed_work abort_work; 74 75 struct rcu_head rcu; 76 77 int eh_eflags; /* Used by error handlr */ 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 93 unsigned short cmd_len; 94 enum dma_data_direction sc_data_direction; 95 96 /* These elements define the operation we are about to perform */ 97 unsigned char *cmnd; 98 99 100 /* These elements define the operation we ultimately want to perform */ 101 struct scsi_data_buffer sdb; 102 struct scsi_data_buffer *prot_sdb; 103 104 unsigned underflow; /* Return error if less than 105 this amount is transferred */ 106 107 unsigned transfersize; /* How much we are guaranteed to 108 transfer with each SCSI transfer 109 (ie, between disconnect / 110 reconnects. Probably == sector 111 size */ 112 113 struct request *request; /* The command we are 114 working on */ 115 116 unsigned char *sense_buffer; 117 /* obtained by REQUEST SENSE when 118 * CHECK CONDITION is received on original 119 * command (auto-sense). Length must be 120 * SCSI_SENSE_BUFFERSIZE bytes. */ 121 122 /* Low-level done function - can be used by low-level driver to point 123 * to completion function. Not used by mid/upper level code. */ 124 void (*scsi_done) (struct scsi_cmnd *); 125 126 /* 127 * The following fields can be written to by the host specific code. 128 * Everything else should be left alone. 129 */ 130 struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ 131 132 unsigned char *host_scribble; /* The host adapter is allowed to 133 * call scsi_malloc and get some memory 134 * and hang it here. The host adapter 135 * is also expected to call scsi_free 136 * to release this memory. (The memory 137 * obtained by scsi_malloc is guaranteed 138 * to be at an address < 16Mb). */ 139 140 int result; /* Status code from lower level driver */ 141 int flags; /* Command flags */ 142 unsigned long state; /* Command completion state */ 143 144 unsigned char tag; /* SCSI-II queued command tag */ 145 }; 146 147 /* 148 * Return the driver private allocation behind the command. 149 * Only works if cmd_size is set in the host template. 150 */ 151 static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) 152 { 153 return cmd + 1; 154 } 155 156 /* make sure not to use it with passthrough commands */ 157 static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) 158 { 159 return *(struct scsi_driver **)cmd->request->rq_disk->private_data; 160 } 161 162 extern void scsi_put_command(struct scsi_cmnd *); 163 extern void scsi_finish_command(struct scsi_cmnd *cmd); 164 165 extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, 166 size_t *offset, size_t *len); 167 extern void scsi_kunmap_atomic_sg(void *virt); 168 169 extern blk_status_t scsi_init_io(struct scsi_cmnd *cmd); 170 171 #ifdef CONFIG_SCSI_DMA 172 extern int scsi_dma_map(struct scsi_cmnd *cmd); 173 extern void scsi_dma_unmap(struct scsi_cmnd *cmd); 174 #else /* !CONFIG_SCSI_DMA */ 175 static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; } 176 static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { } 177 #endif /* !CONFIG_SCSI_DMA */ 178 179 static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) 180 { 181 return cmd->sdb.table.nents; 182 } 183 184 static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) 185 { 186 return cmd->sdb.table.sgl; 187 } 188 189 static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) 190 { 191 return cmd->sdb.length; 192 } 193 194 static inline void scsi_set_resid(struct scsi_cmnd *cmd, unsigned int resid) 195 { 196 cmd->req.resid_len = resid; 197 } 198 199 static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd) 200 { 201 return cmd->req.resid_len; 202 } 203 204 #define scsi_for_each_sg(cmd, sg, nseg, __i) \ 205 for_each_sg(scsi_sglist(cmd), sg, nseg, __i) 206 207 static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, 208 void *buf, int buflen) 209 { 210 return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 211 buf, buflen); 212 } 213 214 static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, 215 void *buf, int buflen) 216 { 217 return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), 218 buf, buflen); 219 } 220 221 /* 222 * The operations below are hints that tell the controller driver how 223 * to handle I/Os with DIF or similar types of protection information. 224 */ 225 enum scsi_prot_operations { 226 /* Normal I/O */ 227 SCSI_PROT_NORMAL = 0, 228 229 /* OS-HBA: Protected, HBA-Target: Unprotected */ 230 SCSI_PROT_READ_INSERT, 231 SCSI_PROT_WRITE_STRIP, 232 233 /* OS-HBA: Unprotected, HBA-Target: Protected */ 234 SCSI_PROT_READ_STRIP, 235 SCSI_PROT_WRITE_INSERT, 236 237 /* OS-HBA: Protected, HBA-Target: Protected */ 238 SCSI_PROT_READ_PASS, 239 SCSI_PROT_WRITE_PASS, 240 }; 241 242 static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) 243 { 244 scmd->prot_op = op; 245 } 246 247 static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) 248 { 249 return scmd->prot_op; 250 } 251 252 enum scsi_prot_flags { 253 SCSI_PROT_TRANSFER_PI = 1 << 0, 254 SCSI_PROT_GUARD_CHECK = 1 << 1, 255 SCSI_PROT_REF_CHECK = 1 << 2, 256 SCSI_PROT_REF_INCREMENT = 1 << 3, 257 SCSI_PROT_IP_CHECKSUM = 1 << 4, 258 }; 259 260 /* 261 * The controller usually does not know anything about the target it 262 * is communicating with. However, when DIX is enabled the controller 263 * must be know target type so it can verify the protection 264 * information passed along with the I/O. 265 */ 266 enum scsi_prot_target_type { 267 SCSI_PROT_DIF_TYPE0 = 0, 268 SCSI_PROT_DIF_TYPE1, 269 SCSI_PROT_DIF_TYPE2, 270 SCSI_PROT_DIF_TYPE3, 271 }; 272 273 static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) 274 { 275 scmd->prot_type = type; 276 } 277 278 static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) 279 { 280 return scmd->prot_type; 281 } 282 283 static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) 284 { 285 return blk_rq_pos(scmd->request); 286 } 287 288 static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) 289 { 290 return scmd->device->sector_size; 291 } 292 293 static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) 294 { 295 return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; 296 } 297 298 static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) 299 { 300 return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; 301 } 302 303 static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) 304 { 305 return cmd->prot_sdb; 306 } 307 308 #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ 309 for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) 310 311 static inline void set_msg_byte(struct scsi_cmnd *cmd, char status) 312 { 313 cmd->result = (cmd->result & 0xffff00ff) | (status << 8); 314 } 315 316 static inline void set_host_byte(struct scsi_cmnd *cmd, char status) 317 { 318 cmd->result = (cmd->result & 0xff00ffff) | (status << 16); 319 } 320 321 static inline void set_driver_byte(struct scsi_cmnd *cmd, char status) 322 { 323 cmd->result = (cmd->result & 0x00ffffff) | (status << 24); 324 } 325 326 static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd) 327 { 328 unsigned int xfer_len = scmd->sdb.length; 329 unsigned int prot_interval = scsi_prot_interval(scmd); 330 331 if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) 332 xfer_len += (xfer_len >> ilog2(prot_interval)) * 8; 333 334 return xfer_len; 335 } 336 337 #endif /* _SCSI_SCSI_CMND_H */ 338