habanalabs/gaudi: support CS with no completion

As part of the staged submission feature, we need Gaudi to support
command submissions that will never get a completion.
Signed-off-by: Ofir Bitton <obitton@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/common/command_submission.c

@@ -225,6 +225,7 @@ static int cs_parser(struct hl_fpriv *hpriv, struct hl_cs_job *job)
 	parser.queue_type = job->queue_type;
 	parser.is_kernel_allocated_cb = job->is_kernel_allocated_cb;
 	job->patched_cb = NULL;
+	parser.completion = true;
 
 	rc = hdev->asic_funcs->cs_parser(hdev, &parser);
 

drivers/misc/habanalabs/common/habanalabs.h

@@ -1223,6 +1223,7 @@ struct hl_cs_job {
  *                    MSG_PROT packets. Relevant only for GAUDI as GOYA doesn't
  *                    have streams so the engine can't be busy by another
  *                    stream.
+ * @completion: true if we need completion for this CS.
  */
 struct hl_cs_parser {
 	struct hl_cb		*user_cb;
@@ -1237,6 +1238,7 @@ struct hl_cs_parser {
 	u8			job_id;
 	u8			is_kernel_allocated_cb;
 	u8			contains_dma_pkt;
+	u8			completion;
 };
 
 /*

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -5060,6 +5060,7 @@ static int gaudi_validate_cb(struct hl_device *hdev,
 	 * 1. A packet that will act as a completion packet
 	 * 2. A packet that will generate MSI-X interrupt
 	 */
+	if (parser->completion)
 		parser->patched_cb_size += sizeof(struct packet_msg_prot) * 2;
 
 	return rc;
@@ -5287,8 +5288,11 @@ static int gaudi_parse_cb_mmu(struct hl_device *hdev,
 	 * 1. A packet that will act as a completion packet
 	 * 2. A packet that will generate MSI interrupt
 	 */
+	if (parser->completion)
 		parser->patched_cb_size = parser->user_cb_size +
 				sizeof(struct packet_msg_prot) * 2;
+	else
+		parser->patched_cb_size = parser->user_cb_size;
 
 	rc = hl_cb_create(hdev, &hdev->kernel_cb_mgr, hdev->kernel_ctx,
 				parser->patched_cb_size, false, false,