3c356bde19
There is no reason for ULDs to pass in a flag on how to allocate the S/G lists. While we don't need GFP_ATOMIC for the blk-mq case because we don't hold locks, that decision can be made way down the chain without having to pass a pointless gfp_mask argument. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Hannes Reinecke <hare@suse.de>
353 lines
9.3 KiB
C
353 lines
9.3 KiB
C
#ifndef _SCSI_SCSI_CMND_H
|
|
#define _SCSI_SCSI_CMND_H
|
|
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/blkdev.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;
|
|
struct scsi_driver;
|
|
|
|
#include <scsi/scsi_device.h>
|
|
|
|
/*
|
|
* 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;
|
|
int resid;
|
|
};
|
|
|
|
/* 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)
|
|
|
|
struct scsi_cmnd {
|
|
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;
|
|
int eh_eflags; /* Used by error handlr */
|
|
|
|
/*
|
|
* A SCSI Command is assigned a nonzero serial_number before passed
|
|
* to the driver's queue command function. The serial_number is
|
|
* cleared when scsi_done is entered indicating that the command
|
|
* has been completed. It is a bug for LLDDs to use this number
|
|
* for purposes other than printk (and even that is only useful
|
|
* for debugging).
|
|
*/
|
|
unsigned long serial_number;
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
#define SCSI_SENSE_BUFFERSIZE 96
|
|
unsigned char *sense_buffer;
|
|
/* obtained by REQUEST SENSE when
|
|
* CHECK CONDITION is received on original
|
|
* command (auto-sense) */
|
|
|
|
/* 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 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 REQ_TYPE_BLOCK_PC 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 struct scsi_cmnd *scsi_get_command(struct scsi_device *, gfp_t);
|
|
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 int scsi_init_io(struct scsi_cmnd *cmd);
|
|
|
|
extern int scsi_dma_map(struct scsi_cmnd *cmd);
|
|
extern void scsi_dma_unmap(struct scsi_cmnd *cmd);
|
|
|
|
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->sdb.resid = resid;
|
|
}
|
|
|
|
static inline int scsi_get_resid(struct scsi_cmnd *cmd)
|
|
{
|
|
return cmd->sdb.resid;
|
|
}
|
|
|
|
#define scsi_for_each_sg(cmd, sg, nseg, __i) \
|
|
for_each_sg(scsi_sglist(cmd), sg, nseg, __i)
|
|
|
|
static inline int scsi_bidi_cmnd(struct scsi_cmnd *cmd)
|
|
{
|
|
return blk_bidi_rq(cmd->request) &&
|
|
(cmd->request->next_rq->special != NULL);
|
|
}
|
|
|
|
static inline struct scsi_data_buffer *scsi_in(struct scsi_cmnd *cmd)
|
|
{
|
|
return scsi_bidi_cmnd(cmd) ?
|
|
cmd->request->next_rq->special : &cmd->sdb;
|
|
}
|
|
|
|
static inline struct scsi_data_buffer *scsi_out(struct scsi_cmnd *cmd)
|
|
{
|
|
return &cmd->sdb;
|
|
}
|
|
|
|
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 u32 scsi_prot_ref_tag(struct scsi_cmnd *scmd)
|
|
{
|
|
return blk_rq_pos(scmd->request) >>
|
|
(ilog2(scsi_prot_interval(scmd)) - 9) & 0xffffffff;
|
|
}
|
|
|
|
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 = scsi_out(scmd)->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 */
|