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[SCSI] sd: Detach DIF from block integrity infrastructure 

So far we have only issued DIF commands if CONFIG_BLK_DEV_INTEGRITY is
enabled.  However, communication between initiator and target should be
independent of protection information DMA.  There are DIF-only host
adapters coming out that will be able to take advantage of this.

Move the relevant DIF bits to sd.c.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Martin K. Petersen 2009-09-18 17:33:00 -04:00 committed by James Bottomley
parent c6af404215
commit 35e1a5d90b
4 changed files with 53 additions and 80 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

61
drivers/scsi/sd.c
View File

@ -370,6 +370,31 @@ static void scsi_disk_put(struct scsi_disk *sdkp)
mutex_unlock(&sd_ref_mutex);
}
static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
{
unsigned int prot_op = SCSI_PROT_NORMAL;
unsigned int dix = scsi_prot_sg_count(scmd);
if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
if (dif && dix)
prot_op = SCSI_PROT_READ_PASS;
else if (dif && !dix)
prot_op = SCSI_PROT_READ_STRIP;
else if (!dif && dix)
prot_op = SCSI_PROT_READ_INSERT;
} else {
if (dif && dix)
prot_op = SCSI_PROT_WRITE_PASS;
else if (dif && !dix)
prot_op = SCSI_PROT_WRITE_INSERT;
else if (!dif && dix)
prot_op = SCSI_PROT_WRITE_STRIP;
}
scsi_set_prot_op(scmd, prot_op);
scsi_set_prot_type(scmd, dif);
}
/**
* sd_init_command - build a scsi (read or write) command from
* information in the request structure.
@ -578,8 +603,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
/* If DIF or DIX is enabled, tell HBA how to handle request */
if (host_dif || scsi_prot_sg_count(SCpnt))
sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
sdkp->protection_type);
sd_prot_op(SCpnt, host_dif);
/*
* We shouldn't disconnect in the middle of a sector, so with a dumb
@ -1238,34 +1262,33 @@ void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
u8 type;
if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
type = 0;
else
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
return;
type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
if (type == sdkp->protection_type || !sdkp->first_scan)
return;
sdkp->protection_type = type;
switch (type) {
case SD_DIF_TYPE0_PROTECTION:
case SD_DIF_TYPE1_PROTECTION:
case SD_DIF_TYPE3_PROTECTION:
break;
case SD_DIF_TYPE2_PROTECTION:
sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
"protection which is currently unsupported. " \
"Disabling disk!\n");
goto disable;
default:
sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
"protection type %d. Disabling disk!\n", type);
goto disable;
sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
"protection type %u. Disabling disk!\n", type);
sdkp->capacity = 0;
return;
}
return;
disable:
sdkp->capacity = 0;
if (scsi_host_dif_capable(sdp->host, type))
sd_printk(KERN_NOTICE, sdkp,
"Enabling DIF Type %u protection\n", type);
else
sd_printk(KERN_NOTICE, sdkp,
"Disabling DIF Type %u protection\n", type);
}
static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,

4
drivers/scsi/sd.h
View File

@ -101,16 +101,12 @@ struct sd_dif_tuple {
#ifdef CONFIG_BLK_DEV_INTEGRITY
extern void sd_dif_op(struct scsi_cmnd *, unsigned int, unsigned int, unsigned int);
extern void sd_dif_config_host(struct scsi_disk *);
extern int sd_dif_prepare(struct request *rq, sector_t, unsigned int);
extern void sd_dif_complete(struct scsi_cmnd *, unsigned int);
#else /* CONFIG_BLK_DEV_INTEGRITY */
static inline void sd_dif_op(struct scsi_cmnd *cmd, unsigned int a, unsigned int b, unsigned int c)
{
}
static inline void sd_dif_config_host(struct scsi_disk *disk)
{
}

53
drivers/scsi/sd_dif.c
View File

@ -320,15 +320,6 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
dif = 0; dix = 1;
}
if (type) {
if (dif)
sd_printk(KERN_NOTICE, sdkp,
"Enabling DIF Type %d protection\n", type);
else
sd_printk(KERN_NOTICE, sdkp,
"Disabling DIF Type %d protection\n", type);
}
if (!dix)
return;
@ -359,50 +350,6 @@ void sd_dif_config_host(struct scsi_disk *sdkp)
}
}
/*
* DIF DMA operation magic decoder ring.
*/
void sd_dif_op(struct scsi_cmnd *scmd, unsigned int dif, unsigned int dix, unsigned int type)
{
int prot_op;
prot_op = SCSI_PROT_NORMAL;
BUG_ON(dif && (scmd->cmnd[0] == READ_6 || scmd->cmnd[0] == WRITE_6));
switch (scmd->cmnd[0]) {
case READ_6:
case READ_10:
case READ_12:
case READ_16:
if (dif && dix)
prot_op = SCSI_PROT_READ_PASS;
else if (dif && !dix)
prot_op = SCSI_PROT_READ_STRIP;
else if (!dif && dix)
prot_op = SCSI_PROT_READ_INSERT;
break;
case WRITE_6:
case WRITE_10:
case WRITE_12:
case WRITE_16:
if (dif && dix)
prot_op = SCSI_PROT_WRITE_PASS;
else if (dif && !dix)
prot_op = SCSI_PROT_WRITE_INSERT;
else if (!dif && dix)
prot_op = SCSI_PROT_WRITE_STRIP;
break;
}
scsi_set_prot_op(scmd, prot_op);
if (dif)
scsi_set_prot_type(scmd, type);
}
/*
* The virtual start sector is the one that was originally submitted
* by the block layer. Due to partitioning, MD/DM cloning, etc. the

15
include/scsi/scsi_host.h
View File

@ -798,9 +798,15 @@ static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost)
static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type)
{
switch (target_type) {
case 1: return shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION;
case 2: return shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION;
case 3: return shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION;
case 1:
if (shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION)
return target_type;
case 2:
if (shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION)
return target_type;
case 3:
if (shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION)
return target_type;
}
return 0;
@ -808,13 +814,14 @@ static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsign
static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type)
{
#if defined(CONFIG_BLK_DEV_INTEGRITY)
switch (target_type) {
case 0: return shost->prot_capabilities & SHOST_DIX_TYPE0_PROTECTION;
case 1: return shost->prot_capabilities & SHOST_DIX_TYPE1_PROTECTION;
case 2: return shost->prot_capabilities & SHOST_DIX_TYPE2_PROTECTION;
case 3: return shost->prot_capabilities & SHOST_DIX_TYPE3_PROTECTION;
}
#endif
return 0;
}