[SCSI] isci: T10 DIF support
This allows the controller to do WRITE_INSERT and READ_STRIP for SAS
disks that support protection information. SAS disks must be formatted
with protection information to use this feature via sg_format.
sg3_utils-1.32 -- sg_format version 1.19 20110730
sg_format usage:
sg_format --format --verbose --pinfo /dev/sda
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 192cb48..751368b 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -53,6 +53,7 @@
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
+#include <scsi/scsi_cmnd.h>
#include "isci.h"
#include "task.h"
#include "request.h"
@@ -264,6 +265,141 @@
task_context->response_iu_lower = lower_32_bits(dma_addr);
}
+static u8 scu_bg_blk_size(struct scsi_device *sdp)
+{
+ switch (sdp->sector_size) {
+ case 512:
+ return 0;
+ case 1024:
+ return 1;
+ case 4096:
+ return 3;
+ default:
+ return 0xff;
+ }
+}
+
+static u32 scu_dif_bytes(u32 len, u32 sector_size)
+{
+ return (len >> ilog2(sector_size)) * 8;
+}
+
+static void scu_ssp_ireq_dif_insert(struct isci_request *ireq, u8 type, u8 op)
+{
+ struct scu_task_context *tc = ireq->tc;
+ struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
+ u8 blk_sz = scu_bg_blk_size(scmd->device);
+
+ tc->block_guard_enable = 1;
+ tc->blk_prot_en = 1;
+ tc->blk_sz = blk_sz;
+ /* DIF write insert */
+ tc->blk_prot_func = 0x2;
+
+ tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
+ scmd->device->sector_size);
+
+ /* always init to 0, used by hw */
+ tc->interm_crc_val = 0;
+
+ tc->init_crc_seed = 0;
+ tc->app_tag_verify = 0;
+ tc->app_tag_gen = 0;
+ tc->ref_tag_seed_verify = 0;
+
+ /* always init to same as bg_blk_sz */
+ tc->UD_bytes_immed_val = scmd->device->sector_size;
+
+ tc->reserved_DC_0 = 0;
+
+ /* always init to 8 */
+ tc->DIF_bytes_immed_val = 8;
+
+ tc->reserved_DC_1 = 0;
+ tc->bgc_blk_sz = scmd->device->sector_size;
+ tc->reserved_E0_0 = 0;
+ tc->app_tag_gen_mask = 0;
+
+ /** setup block guard control **/
+ tc->bgctl = 0;
+
+ /* DIF write insert */
+ tc->bgctl_f.op = 0x2;
+
+ tc->app_tag_verify_mask = 0;
+
+ /* must init to 0 for hw */
+ tc->blk_guard_err = 0;
+
+ tc->reserved_E8_0 = 0;
+
+ if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
+ tc->ref_tag_seed_gen = scsi_get_lba(scmd) & 0xffffffff;
+ else if (type & SCSI_PROT_DIF_TYPE3)
+ tc->ref_tag_seed_gen = 0;
+}
+
+static void scu_ssp_ireq_dif_strip(struct isci_request *ireq, u8 type, u8 op)
+{
+ struct scu_task_context *tc = ireq->tc;
+ struct scsi_cmnd *scmd = ireq->ttype_ptr.io_task_ptr->uldd_task;
+ u8 blk_sz = scu_bg_blk_size(scmd->device);
+
+ tc->block_guard_enable = 1;
+ tc->blk_prot_en = 1;
+ tc->blk_sz = blk_sz;
+ /* DIF read strip */
+ tc->blk_prot_func = 0x1;
+
+ tc->transfer_length_bytes += scu_dif_bytes(tc->transfer_length_bytes,
+ scmd->device->sector_size);
+
+ /* always init to 0, used by hw */
+ tc->interm_crc_val = 0;
+
+ tc->init_crc_seed = 0;
+ tc->app_tag_verify = 0;
+ tc->app_tag_gen = 0;
+
+ if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2))
+ tc->ref_tag_seed_verify = scsi_get_lba(scmd) & 0xffffffff;
+ else if (type & SCSI_PROT_DIF_TYPE3)
+ tc->ref_tag_seed_verify = 0;
+
+ /* always init to same as bg_blk_sz */
+ tc->UD_bytes_immed_val = scmd->device->sector_size;
+
+ tc->reserved_DC_0 = 0;
+
+ /* always init to 8 */
+ tc->DIF_bytes_immed_val = 8;
+
+ tc->reserved_DC_1 = 0;
+ tc->bgc_blk_sz = scmd->device->sector_size;
+ tc->reserved_E0_0 = 0;
+ tc->app_tag_gen_mask = 0;
+
+ /** setup block guard control **/
+ tc->bgctl = 0;
+
+ /* DIF read strip */
+ tc->bgctl_f.crc_verify = 1;
+ tc->bgctl_f.op = 0x1;
+ if ((type & SCSI_PROT_DIF_TYPE1) || (type & SCSI_PROT_DIF_TYPE2)) {
+ tc->bgctl_f.ref_tag_chk = 1;
+ tc->bgctl_f.app_f_detect = 1;
+ } else if (type & SCSI_PROT_DIF_TYPE3)
+ tc->bgctl_f.app_ref_f_detect = 1;
+
+ tc->app_tag_verify_mask = 0;
+
+ /* must init to 0 for hw */
+ tc->blk_guard_err = 0;
+
+ tc->reserved_E8_0 = 0;
+ tc->ref_tag_seed_gen = 0;
+}
+
/**
* This method is will fill in the SCU Task Context for a SSP IO request.
* @sci_req:
@@ -274,6 +410,10 @@
u32 len)
{
struct scu_task_context *task_context = ireq->tc;
+ struct sas_task *sas_task = ireq->ttype_ptr.io_task_ptr;
+ struct scsi_cmnd *scmd = sas_task->uldd_task;
+ u8 prot_type = scsi_get_prot_type(scmd);
+ u8 prot_op = scsi_get_prot_op(scmd);
scu_ssp_reqeust_construct_task_context(ireq, task_context);
@@ -296,6 +436,13 @@
if (task_context->transfer_length_bytes > 0)
sci_request_build_sgl(ireq);
+
+ if (prot_type != SCSI_PROT_DIF_TYPE0) {
+ if (prot_op == SCSI_PROT_READ_STRIP)
+ scu_ssp_ireq_dif_strip(ireq, prot_type, prot_op);
+ else if (prot_op == SCSI_PROT_WRITE_INSERT)
+ scu_ssp_ireq_dif_insert(ireq, prot_type, prot_op);
+ }
}
/**