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authorMartin K. Petersen <martin.petersen@oracle.com>2009-09-18 17:33:00 -0400
committerJames Bottomley <James.Bottomley@suse.de>2009-10-02 09:46:39 -0500
commit35e1a5d90b66487d754ef2f2dcbf1007f806d921 (patch)
tree964511498993ed8fe0c1604ab74ac7a3db9361ba /drivers/scsi/sd.c
parentc6af404215bab0d333accbb497f835d10cb0050c (diff)
[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>
Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c61
1 files changed, 42 insertions, 19 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 8dd96dcd716..1e0a0b07dab 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -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,