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-rw-r--r--include/scsi/scsi_cmnd.h392
1 files changed, 392 insertions, 0 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
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+++ b/include/scsi/scsi_cmnd.h
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+/* 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>
+
+struct Scsi_Host;
+
+/*
+ * 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
+
+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_INITIALIZED (1 << 1)
+#define SCMD_LAST (1 << 2)
+/* flags preserved across unprep / reprep */
+#define SCMD_PRESERVED_FLAGS (SCMD_INITIALIZED)
+
+/* for scmd->state */
+#define SCMD_STATE_COMPLETE 0
+#define SCMD_STATE_INFLIGHT 1
+
+enum scsi_cmnd_submitter {
+ SUBMITTED_BY_BLOCK_LAYER = 0,
+ SUBMITTED_BY_SCSI_ERROR_HANDLER = 1,
+ SUBMITTED_BY_SCSI_RESET_IOCTL = 2,
+} __packed;
+
+struct scsi_cmnd {
+ struct scsi_device *device;
+ struct list_head eh_entry; /* entry for the host eh_abort_list/eh_cmd_q */
+ struct delayed_work abort_work;
+
+ struct rcu_head rcu;
+
+ int eh_eflags; /* Used by error handlr */
+
+ int budget_token;
+
+ /*
+ * 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;
+ enum scsi_cmnd_submitter submitter;
+
+ unsigned short cmd_len;
+ enum dma_data_direction sc_data_direction;
+
+ unsigned char cmnd[32]; /* SCSI CDB */
+
+ /* 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 */
+ unsigned resid_len; /* residual count */
+ unsigned sense_len;
+ 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. */
+
+ int flags; /* Command flags */
+ unsigned long state; /* Command completion state */
+
+ unsigned int extra_len; /* length of alignment and padding */
+
+ /*
+ * The fields below can be modified by the LLD but the fields above
+ * must not be modified.
+ */
+
+ 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 */
+};
+
+/* Variant of blk_mq_rq_from_pdu() that verifies the type of its argument. */
+static inline struct request *scsi_cmd_to_rq(struct scsi_cmnd *scmd)
+{
+ return blk_mq_rq_from_pdu(scmd);
+}
+
+/*
+ * 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;
+}
+
+void scsi_done(struct scsi_cmnd *cmd);
+void scsi_done_direct(struct scsi_cmnd *cmd);
+
+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);
+
+blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd);
+void scsi_free_sgtables(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, unsigned int resid)
+{
+ cmd->resid_len = resid;
+}
+
+static inline unsigned int scsi_get_resid(struct scsi_cmnd *cmd)
+{
+ return cmd->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,
+ const 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);
+}
+
+static inline sector_t scsi_get_sector(struct scsi_cmnd *scmd)
+{
+ return blk_rq_pos(scsi_cmd_to_rq(scmd));
+}
+
+static inline sector_t scsi_get_lba(struct scsi_cmnd *scmd)
+{
+ unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
+
+ return blk_rq_pos(scsi_cmd_to_rq(scmd)) >> shift;
+}
+
+static inline unsigned int scsi_logical_block_count(struct scsi_cmnd *scmd)
+{
+ unsigned int shift = ilog2(scmd->device->sector_size) - SECTOR_SHIFT;
+
+ return blk_rq_bytes(scsi_cmd_to_rq(scmd)) >> shift;
+}
+
+/*
+ * 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 u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
+{
+ struct request *rq = blk_mq_rq_from_pdu(scmd);
+
+ return t10_pi_ref_tag(rq);
+}
+
+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_status_byte(struct scsi_cmnd *cmd, char status)
+{
+ cmd->result = (cmd->result & 0xffffff00) | status;
+}
+
+static inline u8 get_status_byte(struct scsi_cmnd *cmd)
+{
+ return cmd->result & 0xff;
+}
+
+static inline void set_host_byte(struct scsi_cmnd *cmd, char status)
+{
+ cmd->result = (cmd->result & 0xff00ffff) | (status << 16);
+}
+
+static inline u8 get_host_byte(struct scsi_cmnd *cmd)
+{
+ return (cmd->result >> 16) & 0xff;
+}
+
+/**
+ * scsi_msg_to_host_byte() - translate message byte
+ *
+ * Translate the SCSI parallel message byte to a matching
+ * host byte setting. A message of COMMAND_COMPLETE indicates
+ * a successful command execution, any other message indicate
+ * an error. As the messages themselves only have a meaning
+ * for the SCSI parallel protocol this function translates
+ * them into a matching host byte value for SCSI EH.
+ */
+static inline void scsi_msg_to_host_byte(struct scsi_cmnd *cmd, u8 msg)
+{
+ switch (msg) {
+ case COMMAND_COMPLETE:
+ break;
+ case ABORT_TASK_SET:
+ set_host_byte(cmd, DID_ABORT);
+ break;
+ case TARGET_RESET:
+ set_host_byte(cmd, DID_RESET);
+ break;
+ default:
+ set_host_byte(cmd, DID_ERROR);
+ break;
+ }
+}
+
+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;
+}
+
+extern void scsi_build_sense(struct scsi_cmnd *scmd, int desc,
+ u8 key, u8 asc, u8 ascq);
+
+struct request *scsi_alloc_request(struct request_queue *q, blk_opf_t opf,
+ blk_mq_req_flags_t flags);
+
+#endif /* _SCSI_SCSI_CMND_H */