| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _SCSI_SCSI_CMND_H |
| #define _SCSI_SCSI_CMND_H |
| |
| #include <linux/dma-mapping.h> |
| #include <linux/blkdev.h> |
| #include <linux/t10-pi.h> |
| #include <linux/list.h> |
| #include <linux/types.h> |
| #include <linux/timer.h> |
| #include <linux/scatterlist.h> |
| #include <scsi/scsi_device.h> |
| #include <scsi/scsi_request.h> |
| |
| struct Scsi_Host; |
| struct scsi_driver; |
| |
| /* |
| * MAX_COMMAND_SIZE is: |
| * The longest fixed-length SCSI CDB as per the SCSI standard. |
| * fixed-length means: commands that their size can be determined |
| * by their opcode and the CDB does not carry a length specifier, (unlike |
| * the VARIABLE_LENGTH_CMD(0x7f) command). This is actually not exactly |
| * true and the SCSI standard also defines extended commands and |
| * vendor specific commands that can be bigger than 16 bytes. The kernel |
| * will support these using the same infrastructure used for VARLEN CDB's. |
| * So in effect MAX_COMMAND_SIZE means the maximum size command scsi-ml |
| * supports without specifying a cmd_len by ULD's |
| */ |
| #define MAX_COMMAND_SIZE 16 |
| #if (MAX_COMMAND_SIZE > BLK_MAX_CDB) |
| # error MAX_COMMAND_SIZE can not be bigger than BLK_MAX_CDB |
| #endif |
| |
| struct scsi_data_buffer { |
| struct sg_table table; |
| unsigned length; |
| }; |
| |
| /* embedded in scsi_cmnd */ |
| struct scsi_pointer { |
| char *ptr; /* data pointer */ |
| int this_residual; /* left in this buffer */ |
| struct scatterlist *buffer; /* which buffer */ |
| int buffers_residual; /* how many buffers left */ |
| |
| dma_addr_t dma_handle; |
| |
| volatile int Status; |
| volatile int Message; |
| volatile int have_data_in; |
| volatile int sent_command; |
| volatile int phase; |
| }; |
| |
| /* for scmd->flags */ |
| #define SCMD_TAGGED (1 << 0) |
| #define SCMD_UNCHECKED_ISA_DMA (1 << 1) |
| #define SCMD_INITIALIZED (1 << 2) |
| #define SCMD_LAST (1 << 3) |
| /* flags preserved across unprep / reprep */ |
| #define SCMD_PRESERVED_FLAGS (SCMD_UNCHECKED_ISA_DMA | SCMD_INITIALIZED) |
| |
| /* for scmd->state */ |
| #define SCMD_STATE_COMPLETE 0 |
| |
| struct scsi_cmnd { |
| struct scsi_request req; |
| struct scsi_device *device; |
| struct list_head list; /* scsi_cmnd participates in queue lists */ |
| struct list_head eh_entry; /* entry for the host eh_cmd_q */ |
| struct delayed_work abort_work; |
| |
| struct rcu_head rcu; |
| |
| int eh_eflags; /* Used by error handlr */ |
| |
| /* |
| * This is set to jiffies as it was when the command was first |
| * allocated. It is used to time how long the command has |
| * been outstanding |
| */ |
| unsigned long jiffies_at_alloc; |
| |
| int retries; |
| int allowed; |
| |
| unsigned char prot_op; |
| unsigned char prot_type; |
| unsigned char prot_flags; |
| |
| unsigned short cmd_len; |
| enum dma_data_direction sc_data_direction; |
| |
| /* These elements define the operation we are about to perform */ |
| unsigned char *cmnd; |
| |
| |
| /* These elements define the operation we ultimately want to perform */ |
| struct scsi_data_buffer sdb; |
| struct scsi_data_buffer *prot_sdb; |
| |
| unsigned underflow; /* Return error if less than |
| this amount is transferred */ |
| |
| unsigned transfersize; /* How much we are guaranteed to |
| transfer with each SCSI transfer |
| (ie, between disconnect / |
| reconnects. Probably == sector |
| size */ |
| |
| struct request *request; /* The command we are |
| working on */ |
| |
| unsigned char *sense_buffer; |
| /* obtained by REQUEST SENSE when |
| * CHECK CONDITION is received on original |
| * command (auto-sense). Length must be |
| * SCSI_SENSE_BUFFERSIZE bytes. */ |
| |
| /* Low-level done function - can be used by low-level driver to point |
| * to completion function. Not used by mid/upper level code. */ |
| void (*scsi_done) (struct scsi_cmnd *); |
| |
| /* |
| * The following fields can be written to by the host specific code. |
| * Everything else should be left alone. |
| */ |
| struct scsi_pointer SCp; /* Scratchpad used by some host adapters */ |
| |
| unsigned char *host_scribble; /* The host adapter is allowed to |
| * call scsi_malloc and get some memory |
| * and hang it here. The host adapter |
| * is also expected to call scsi_free |
| * to release this memory. (The memory |
| * obtained by scsi_malloc is guaranteed |
| * to be at an address < 16Mb). */ |
| |
| int result; /* Status code from lower level driver */ |
| int flags; /* Command flags */ |
| unsigned long state; /* Command completion state */ |
| |
| unsigned char tag; /* SCSI-II queued command tag */ |
| }; |
| |
| /* |
| * Return the driver private allocation behind the command. |
| * Only works if cmd_size is set in the host template. |
| */ |
| static inline void *scsi_cmd_priv(struct scsi_cmnd *cmd) |
| { |
| return cmd + 1; |
| } |
| |
| /* make sure not to use it with passthrough commands */ |
| static inline struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd) |
| { |
| return *(struct scsi_driver **)cmd->request->rq_disk->private_data; |
| } |
| |
| extern void scsi_put_command(struct scsi_cmnd *); |
| extern void scsi_finish_command(struct scsi_cmnd *cmd); |
| |
| extern void *scsi_kmap_atomic_sg(struct scatterlist *sg, int sg_count, |
| size_t *offset, size_t *len); |
| extern void scsi_kunmap_atomic_sg(void *virt); |
| |
| extern blk_status_t scsi_init_io(struct scsi_cmnd *cmd); |
| |
| #ifdef CONFIG_SCSI_DMA |
| extern int scsi_dma_map(struct scsi_cmnd *cmd); |
| extern void scsi_dma_unmap(struct scsi_cmnd *cmd); |
| #else /* !CONFIG_SCSI_DMA */ |
| static inline int scsi_dma_map(struct scsi_cmnd *cmd) { return -ENOSYS; } |
| static inline void scsi_dma_unmap(struct scsi_cmnd *cmd) { } |
| #endif /* !CONFIG_SCSI_DMA */ |
| |
| static inline unsigned scsi_sg_count(struct scsi_cmnd *cmd) |
| { |
| return cmd->sdb.table.nents; |
| } |
| |
| static inline struct scatterlist *scsi_sglist(struct scsi_cmnd *cmd) |
| { |
| return cmd->sdb.table.sgl; |
| } |
| |
| static inline unsigned scsi_bufflen(struct scsi_cmnd *cmd) |
| { |
| return cmd->sdb.length; |
| } |
| |
| static inline void scsi_set_resid(struct scsi_cmnd *cmd, int resid) |
| { |
| cmd->req.resid_len = resid; |
| } |
| |
| static inline int scsi_get_resid(struct scsi_cmnd *cmd) |
| { |
| return cmd->req.resid_len; |
| } |
| |
| #define scsi_for_each_sg(cmd, sg, nseg, __i) \ |
| for_each_sg(scsi_sglist(cmd), sg, nseg, __i) |
| |
| static inline int scsi_sg_copy_from_buffer(struct scsi_cmnd *cmd, |
| void *buf, int buflen) |
| { |
| return sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), |
| buf, buflen); |
| } |
| |
| static inline int scsi_sg_copy_to_buffer(struct scsi_cmnd *cmd, |
| void *buf, int buflen) |
| { |
| return sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd), |
| buf, buflen); |
| } |
| |
| /* |
| * The operations below are hints that tell the controller driver how |
| * to handle I/Os with DIF or similar types of protection information. |
| */ |
| enum scsi_prot_operations { |
| /* Normal I/O */ |
| SCSI_PROT_NORMAL = 0, |
| |
| /* OS-HBA: Protected, HBA-Target: Unprotected */ |
| SCSI_PROT_READ_INSERT, |
| SCSI_PROT_WRITE_STRIP, |
| |
| /* OS-HBA: Unprotected, HBA-Target: Protected */ |
| SCSI_PROT_READ_STRIP, |
| SCSI_PROT_WRITE_INSERT, |
| |
| /* OS-HBA: Protected, HBA-Target: Protected */ |
| SCSI_PROT_READ_PASS, |
| SCSI_PROT_WRITE_PASS, |
| }; |
| |
| static inline void scsi_set_prot_op(struct scsi_cmnd *scmd, unsigned char op) |
| { |
| scmd->prot_op = op; |
| } |
| |
| static inline unsigned char scsi_get_prot_op(struct scsi_cmnd *scmd) |
| { |
| return scmd->prot_op; |
| } |
| |
| enum scsi_prot_flags { |
| SCSI_PROT_TRANSFER_PI = 1 << 0, |
| SCSI_PROT_GUARD_CHECK = 1 << 1, |
| SCSI_PROT_REF_CHECK = 1 << 2, |
| SCSI_PROT_REF_INCREMENT = 1 << 3, |
| SCSI_PROT_IP_CHECKSUM = 1 << 4, |
| }; |
| |
| /* |
| * The controller usually does not know anything about the target it |
| * is communicating with. However, when DIX is enabled the controller |
| * must be know target type so it can verify the protection |
| * information passed along with the I/O. |
| */ |
| enum scsi_prot_target_type { |
| SCSI_PROT_DIF_TYPE0 = 0, |
| SCSI_PROT_DIF_TYPE1, |
| SCSI_PROT_DIF_TYPE2, |
| SCSI_PROT_DIF_TYPE3, |
| }; |
| |
| static inline void scsi_set_prot_type(struct scsi_cmnd *scmd, unsigned char type) |
| { |
| scmd->prot_type = type; |
| } |
| |
| static inline unsigned char scsi_get_prot_type(struct scsi_cmnd *scmd) |
| { |
| return scmd->prot_type; |
| } |
| |
| static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd) |
| { |
| return blk_rq_pos(scmd->request); |
| } |
| |
| static inline unsigned int scsi_prot_interval(struct scsi_cmnd *scmd) |
| { |
| return scmd->device->sector_size; |
| } |
| |
| static inline unsigned scsi_prot_sg_count(struct scsi_cmnd *cmd) |
| { |
| return cmd->prot_sdb ? cmd->prot_sdb->table.nents : 0; |
| } |
| |
| static inline struct scatterlist *scsi_prot_sglist(struct scsi_cmnd *cmd) |
| { |
| return cmd->prot_sdb ? cmd->prot_sdb->table.sgl : NULL; |
| } |
| |
| static inline struct scsi_data_buffer *scsi_prot(struct scsi_cmnd *cmd) |
| { |
| return cmd->prot_sdb; |
| } |
| |
| #define scsi_for_each_prot_sg(cmd, sg, nseg, __i) \ |
| for_each_sg(scsi_prot_sglist(cmd), sg, nseg, __i) |
| |
| static inline void set_msg_byte(struct scsi_cmnd *cmd, char status) |
| { |
| cmd->result = (cmd->result & 0xffff00ff) | (status << 8); |
| } |
| |
| static inline void set_host_byte(struct scsi_cmnd *cmd, char status) |
| { |
| cmd->result = (cmd->result & 0xff00ffff) | (status << 16); |
| } |
| |
| static inline void set_driver_byte(struct scsi_cmnd *cmd, char status) |
| { |
| cmd->result = (cmd->result & 0x00ffffff) | (status << 24); |
| } |
| |
| static inline unsigned scsi_transfer_length(struct scsi_cmnd *scmd) |
| { |
| unsigned int xfer_len = scmd->sdb.length; |
| unsigned int prot_interval = scsi_prot_interval(scmd); |
| |
| if (scmd->prot_flags & SCSI_PROT_TRANSFER_PI) |
| xfer_len += (xfer_len >> ilog2(prot_interval)) * 8; |
| |
| return xfer_len; |
| } |
| |
| #endif /* _SCSI_SCSI_CMND_H */ |