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authorPiotr Sawicki <piotr.sawicki@intel.com>2011-05-10 23:50:32 +0000
committerDan Williams <dan.j.williams@intel.com>2011-07-03 04:04:48 -0700
commitf4636a7b2ab8288466b83a8459d47c43143a70dc (patch)
tree4b8c8c425b7348c9b2a3ae1cf9a4c353adb3cc06 /drivers/scsi/isci/request.c
parentf00e6ba4996a34f098fe50c78077f0568fd838ec (diff)
isci: unify request start handlers
Unify the implementation in scic_sds_request_start and kill the state handler. Reported-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Piotr Sawicki <piotr.sawicki@intel.com> [remove scic_sds_request_constructed_state_start_handler] Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/scsi/isci/request.c')
-rw-r--r--drivers/scsi/isci/request.c156
1 files changed, 71 insertions, 85 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c
index 69688636347e..41a418d8b337 100644
--- a/drivers/scsi/isci/request.c
+++ b/drivers/scsi/isci/request.c
@@ -757,23 +757,80 @@ static u32 sci_req_tx_bytes(struct scic_sds_request *sci_req)
return ret_val;
}
-enum sci_status
-scic_sds_request_start(struct scic_sds_request *request)
+enum sci_status scic_sds_request_start(struct scic_sds_request *sci_req)
{
- if (request->device_sequence !=
- scic_sds_remote_device_get_sequence(request->target_device))
+ struct scic_sds_controller *scic = sci_req->owning_controller;
+ struct scu_task_context *task_context;
+ enum sci_base_request_states state;
+
+ if (sci_req->device_sequence !=
+ scic_sds_remote_device_get_sequence(sci_req->target_device))
return SCI_FAILURE;
- if (request->state_handlers->start_handler)
- return request->state_handlers->start_handler(request);
+ state = sci_req->state_machine.current_state_id;
+ if (state != SCI_BASE_REQUEST_STATE_CONSTRUCTED) {
+ dev_warn(scic_to_dev(scic),
+ "%s: SCIC IO Request requested to start while in wrong "
+ "state %d\n", __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
- dev_warn(scic_to_dev(request->owning_controller),
- "%s: SCIC IO Request requested to start while in wrong "
- "state %d\n",
- __func__,
- sci_base_state_machine_get_state(&request->state_machine));
+ /* if necessary, allocate a TCi for the io request object and then will,
+ * if necessary, copy the constructed TC data into the actual TC buffer.
+ * If everything is successful the post context field is updated with
+ * the TCi so the controller can post the request to the hardware.
+ */
+ if (sci_req->io_tag == SCI_CONTROLLER_INVALID_IO_TAG)
+ sci_req->io_tag = scic_controller_allocate_io_tag(scic);
- return SCI_FAILURE_INVALID_STATE;
+ /* Record the IO Tag in the request */
+ if (sci_req->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
+ task_context = sci_req->task_context_buffer;
+
+ task_context->task_index = scic_sds_io_tag_get_index(sci_req->io_tag);
+
+ switch (task_context->protocol_type) {
+ case SCU_TASK_CONTEXT_PROTOCOL_SMP:
+ case SCU_TASK_CONTEXT_PROTOCOL_SSP:
+ /* SSP/SMP Frame */
+ task_context->type.ssp.tag = sci_req->io_tag;
+ task_context->type.ssp.target_port_transfer_tag =
+ 0xFFFF;
+ break;
+
+ case SCU_TASK_CONTEXT_PROTOCOL_STP:
+ /* STP/SATA Frame
+ * task_context->type.stp.ncq_tag = sci_req->ncq_tag;
+ */
+ break;
+
+ case SCU_TASK_CONTEXT_PROTOCOL_NONE:
+ /* / @todo When do we set no protocol type? */
+ break;
+
+ default:
+ /* This should never happen since we build the IO
+ * requests */
+ break;
+ }
+
+ /*
+ * Check to see if we need to copy the task context buffer
+ * or have been building into the task context buffer */
+ if (sci_req->was_tag_assigned_by_user == false)
+ scic_sds_controller_copy_task_context(scic, sci_req);
+
+ /* Add to the post_context the io tag value */
+ sci_req->post_context |= scic_sds_io_tag_get_index(sci_req->io_tag);
+
+ /* Everything is good go ahead and change state */
+ sci_base_state_machine_change_state(&sci_req->state_machine,
+ SCI_BASE_REQUEST_STATE_STARTED);
+
+ return SCI_SUCCESS;
+ }
+
+ return SCI_FAILURE_INSUFFICIENT_RESOURCES;
}
enum sci_status
@@ -904,75 +961,6 @@ static void scic_sds_io_request_copy_response(struct scic_sds_request *sci_req)
}
/*
- * This method implements the action taken when a constructed
- * SCIC_SDS_IO_REQUEST_T object receives a scic_sds_request_start() request.
- * This method will, if necessary, allocate a TCi for the io request object and
- * then will, if necessary, copy the constructed TC data into the actual TC
- * buffer. If everything is successful the post context field is updated with
- * the TCi so the controller can post the request to the hardware. enum sci_status
- * SCI_SUCCESS SCI_FAILURE_INSUFFICIENT_RESOURCES
- */
-static enum sci_status scic_sds_request_constructed_state_start_handler(
- struct scic_sds_request *request)
-{
- struct scu_task_context *task_context;
-
- if (request->io_tag == SCI_CONTROLLER_INVALID_IO_TAG) {
- request->io_tag =
- scic_controller_allocate_io_tag(request->owning_controller);
- }
-
- /* Record the IO Tag in the request */
- if (request->io_tag != SCI_CONTROLLER_INVALID_IO_TAG) {
- task_context = request->task_context_buffer;
-
- task_context->task_index = scic_sds_io_tag_get_index(request->io_tag);
-
- switch (task_context->protocol_type) {
- case SCU_TASK_CONTEXT_PROTOCOL_SMP:
- case SCU_TASK_CONTEXT_PROTOCOL_SSP:
- /* SSP/SMP Frame */
- task_context->type.ssp.tag = request->io_tag;
- task_context->type.ssp.target_port_transfer_tag = 0xFFFF;
- break;
-
- case SCU_TASK_CONTEXT_PROTOCOL_STP:
- /*
- * STP/SATA Frame
- * task_context->type.stp.ncq_tag = request->ncq_tag; */
- break;
-
- case SCU_TASK_CONTEXT_PROTOCOL_NONE:
- /* / @todo When do we set no protocol type? */
- break;
-
- default:
- /* This should never happen since we build the IO requests */
- break;
- }
-
- /*
- * Check to see if we need to copy the task context buffer
- * or have been building into the task context buffer */
- if (request->was_tag_assigned_by_user == false) {
- scic_sds_controller_copy_task_context(
- request->owning_controller, request);
- }
-
- /* Add to the post_context the io tag value */
- request->post_context |= scic_sds_io_tag_get_index(request->io_tag);
-
- /* Everything is good go ahead and change state */
- sci_base_state_machine_change_state(&request->state_machine,
- SCI_BASE_REQUEST_STATE_STARTED);
-
- return SCI_SUCCESS;
- }
-
- return SCI_FAILURE_INSUFFICIENT_RESOURCES;
-}
-
-/*
* scic_sds_request_started_state_tc_completion_handler() - This method process
* TC (task context) completions for normal IO request (i.e. Task/Abort
* Completions of type 0). This method will update the
@@ -2529,10 +2517,8 @@ static enum sci_status scic_sds_stp_request_soft_reset_await_d2h_frame_handler(
}
static const struct scic_sds_io_request_state_handler scic_sds_request_state_handler_table[] = {
- [SCI_BASE_REQUEST_STATE_INITIAL] = { },
- [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = {
- .start_handler = scic_sds_request_constructed_state_start_handler,
- },
+ [SCI_BASE_REQUEST_STATE_INITIAL] = {},
+ [SCI_BASE_REQUEST_STATE_CONSTRUCTED] = {},
[SCI_BASE_REQUEST_STATE_STARTED] = {
.tc_completion_handler = scic_sds_request_started_state_tc_completion_handler,
.frame_handler = scic_sds_request_started_state_frame_handler,

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