[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>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 8dd96dc..1e0a0b0 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -370,6 +370,31 @@
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 @@
/* 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 @@
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,
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 8474b5ba..ce1f5f8 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -101,16 +101,12 @@
#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)
{
}
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 84224dd..88da977 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -320,15 +320,6 @@
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;
@@ -360,50 +351,6 @@
}
/*
- * 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
* actual physical start sector is likely to be different. Remap
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b62a097..6e728b1 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -798,9 +798,15 @@
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_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;
}