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authorsumit.saxena@avagotech.com <sumit.saxena@avagotech.com>2015-10-15 13:40:44 +0530
committerMartin K. Petersen <martin.petersen@oracle.com>2015-10-29 03:31:33 -0400
commit0b48d12d0365a628d2257a4560b3b06c825fe1cd (patch)
tree1c08ffef0eeaa16ea2a04fd0ef9153610509e8f4 /drivers/scsi/megaraid/megaraid_sas_base.c
parent91626c2701acad605c434b5e8245cbeea6671382 (diff)
downloadlinux-stericsson-0b48d12d0365a628d2257a4560b3b06c825fe1cd.tar.gz
megaraid_sas: Make PI enabled VD 8 byte DMA aligned
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com> Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com> Reviewed-by: Tomas Henzl <thenzl@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/megaraid/megaraid_sas_base.c')
-rw-r--r--drivers/scsi/megaraid/megaraid_sas_base.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index f9ed4ef04b80..071ea1cad41c 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -1725,8 +1725,42 @@ static struct megasas_instance *megasas_lookup_instance(u16 host_no)
return NULL;
}
+/*
+* megasas_set_dma_alignment - Set DMA alignment for PI enabled VD
+*
+* @sdev: OS provided scsi device
+*
+* Returns void
+*/
+static void megasas_set_dma_alignment(struct scsi_device *sdev)
+{
+ u32 device_id, ld;
+ struct megasas_instance *instance;
+ struct fusion_context *fusion;
+ struct MR_LD_RAID *raid;
+ struct MR_DRV_RAID_MAP_ALL *local_map_ptr;
+
+ instance = megasas_lookup_instance(sdev->host->host_no);
+ fusion = instance->ctrl_context;
+
+ if (!fusion)
+ return;
+
+ if (sdev->channel >= MEGASAS_MAX_PD_CHANNELS) {
+ device_id = ((sdev->channel % 2) * MEGASAS_MAX_DEV_PER_CHANNEL)
+ + sdev->id;
+ local_map_ptr = fusion->ld_drv_map[(instance->map_id & 1)];
+ ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
+ raid = MR_LdRaidGet(ld, local_map_ptr);
+
+ if (raid->capability.ldPiMode == MR_PROT_INFO_TYPE_CONTROLLER)
+ blk_queue_update_dma_alignment(sdev->request_queue, 0x7);
+ }
+}
+
static int megasas_slave_configure(struct scsi_device *sdev)
{
+ megasas_set_dma_alignment(sdev);
/*
* The RAID firmware may require extended timeouts.
*/