From: Kevin Barnett <kevin.barn...@microsemi.com>
Take advantage of controller improvements.
Reviewed-by: Scott Teel <scott.t...@microsemi.com>
Reviewed-by: Scott Benesh <scott.ben...@microsemi.com>
Signed-off-by: Kevin Barnett <kevin.barn...@microsemi.com>
Signed-off-by: Don Brace <don.br...@microsemi.com>
---
drivers/scsi/smartpqi/smartpqi_init.c | 68 +++++++++++++++++++--------------
1 file changed, 39 insertions(+), 29 deletions(-)
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c
b/drivers/scsi/smartpqi/smartpqi_init.c
index 906f1aa..418f636 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -4263,48 +4263,58 @@ static int pqi_build_aio_sg_list(struct pqi_ctrl_info
*ctrl_info,
int i;
u16 iu_length;
int sg_count;
- unsigned int num_sg_in_iu = 0;
+ bool chained;
+ unsigned int num_sg_in_iu;
+ unsigned int max_sg_per_iu;
struct scatterlist *sg;
struct pqi_sg_descriptor *sg_descriptor;
sg_count = scsi_dma_map(scmd);
if (sg_count < 0)
return sg_count;
+
+ iu_length = offsetof(struct pqi_aio_path_request, sg_descriptors) -
+ PQI_REQUEST_HEADER_LENGTH;
+ num_sg_in_iu = 0;
+
if (sg_count == 0)
goto out;
- if (sg_count <= ctrl_info->max_sg_per_iu) {
- sg_descriptor = &request->sg_descriptors[0];
- scsi_for_each_sg(scmd, sg, sg_count, i) {
- pqi_set_sg_descriptor(sg_descriptor, sg);
- sg_descriptor++;
- }
- put_unaligned_le32(CISS_SG_LAST,
- &request->sg_descriptors[sg_count - 1].flags);
- num_sg_in_iu = sg_count;
- } else {
- sg_descriptor = &request->sg_descriptors[0];
- put_unaligned_le64((u64)io_request->sg_chain_buffer_dma_handle,
- &sg_descriptor->address);
- put_unaligned_le32(sg_count * sizeof(*sg_descriptor),
- &sg_descriptor->length);
- put_unaligned_le32(CISS_SG_CHAIN, &sg_descriptor->flags);
-
- sg_descriptor = io_request->sg_chain_buffer;
- scsi_for_each_sg(scmd, sg, sg_count, i) {
- pqi_set_sg_descriptor(sg_descriptor, sg);
- sg_descriptor++;
+ sg = scsi_sglist(scmd);
+ sg_descriptor = request->sg_descriptors;
+ max_sg_per_iu = ctrl_info->max_sg_per_iu - 1;
+ chained = false;
+ i = 0;
+
+ while (1) {
+ pqi_set_sg_descriptor(sg_descriptor, sg);
+ if (!chained)
+ num_sg_in_iu++;
+ i++;
+ if (i == sg_count)
+ break;
+ sg_descriptor++;
+ if (i == max_sg_per_iu) {
+ put_unaligned_le64(
+ (u64)io_request->sg_chain_buffer_dma_handle,
+ &sg_descriptor->address);
+ put_unaligned_le32((sg_count - num_sg_in_iu)
+ * sizeof(*sg_descriptor),
+ &sg_descriptor->length);
+ put_unaligned_le32(CISS_SG_CHAIN,
+ &sg_descriptor->flags);
+ chained = true;
+ num_sg_in_iu++;
+ sg_descriptor = io_request->sg_chain_buffer;
}
- put_unaligned_le32(CISS_SG_LAST,
- &io_request->sg_chain_buffer[sg_count - 1].flags);
- num_sg_in_iu = 1;
- request->partial = 1;
+ sg = sg_next(sg);
}
-out:
- iu_length = offsetof(struct pqi_aio_path_request, sg_descriptors) -
- PQI_REQUEST_HEADER_LENGTH;
+ put_unaligned_le32(CISS_SG_LAST, &sg_descriptor->flags);
+ request->partial = chained;
iu_length += num_sg_in_iu * sizeof(*sg_descriptor);
+
+out:
put_unaligned_le16(iu_length, &request->header.iu_length);
request->num_sg_descriptors = num_sg_in_iu;
--
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