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isci: unify remote_device start_io_handlers 

Implement all states in scic_sds_remote_device_start_io() and delete the
state handler.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2011-05-01 14:57:11 -07:00
parent 8151518265
commit 1860655706
2 changed files with 125 additions and 215 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

334
drivers/scsi/isci/remote_device.c
View File

@ -305,22 +305,132 @@ enum sci_status scic_sds_remote_device_event_handler(
return sci_dev->state_handlers->event_handler(sci_dev, event_code);
}
/**
*
* @controller: The controller that is starting the io request.
* @sci_dev: The remote device for which the start io handling is being
* requested.
* @io_request: The io request that is being started.
*
* This method invokes the remote device start io handler. enum sci_status
*/
enum sci_status scic_sds_remote_device_start_io(
struct scic_sds_controller *controller,
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *io_request)
static void scic_sds_remote_device_start_request(struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req,
enum sci_status status)
{
return sci_dev->state_handlers->start_io_handler(
sci_dev, io_request);
struct scic_sds_port *sci_port = sci_dev->owning_port;
/* cleanup requests that failed after starting on the port */
if (status != SCI_SUCCESS)
scic_sds_port_complete_io(sci_port, sci_dev, sci_req);
else
scic_sds_remote_device_increment_request_count(sci_dev);
}
enum sci_status scic_sds_remote_device_start_io(struct scic_sds_controller *scic,
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req)
{
struct sci_base_state_machine *sm = &sci_dev->state_machine;
enum scic_sds_remote_device_states state = sm->current_state_id;
struct scic_sds_port *sci_port = sci_dev->owning_port;
enum sci_status status;
switch (state) {
case SCI_BASE_REMOTE_DEVICE_STATE_INITIAL:
case SCI_BASE_REMOTE_DEVICE_STATE_STOPPED:
case SCI_BASE_REMOTE_DEVICE_STATE_STARTING:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ_ERROR:
case SCI_BASE_REMOTE_DEVICE_STATE_STOPPING:
case SCI_BASE_REMOTE_DEVICE_STATE_FAILED:
case SCI_BASE_REMOTE_DEVICE_STATE_RESETTING:
case SCI_BASE_REMOTE_DEVICE_STATE_FINAL:
default:
dev_warn(scirdev_to_dev(sci_dev), "%s: in wrong state: %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
case SCI_BASE_REMOTE_DEVICE_STATE_READY:
/* attempt to start an io request for this device object. The remote
* device object will issue the start request for the io and if
* successful it will start the request for the port object then
* increment its own request count.
*/
status = scic_sds_port_start_io(sci_port, sci_dev, sci_req);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, sci_req);
if (status != SCI_SUCCESS)
break;
status = scic_sds_request_start(sci_req);
break;
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_IDLE: {
/* handle the start io operation for a sata device that is in
* the command idle state. - Evalute the type of IO request to
* be started - If its an NCQ request change to NCQ substate -
* If its any other command change to the CMD substate
*
* If this is a softreset we may want to have a different
* substate.
*/
enum scic_sds_remote_device_states new_state;
status = scic_sds_port_start_io(sci_port, sci_dev, sci_req);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, sci_req);
if (status != SCI_SUCCESS)
break;
status = sci_req->state_handlers->start_handler(sci_req);
if (status != SCI_SUCCESS)
break;
if (isci_sata_get_sat_protocol(sci_req->ireq) == SAT_PROTOCOL_FPDMA)
new_state = SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ;
else {
sci_dev->working_request = sci_req;
new_state = SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_CMD;
}
sci_base_state_machine_change_state(sm, new_state);
break;
}
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ:
if (isci_sata_get_sat_protocol(sci_req->ireq) == SAT_PROTOCOL_FPDMA) {
status = scic_sds_port_start_io(sci_port, sci_dev, sci_req);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, sci_req);
if (status != SCI_SUCCESS)
break;
status = sci_req->state_handlers->start_handler(sci_req);
} else
return SCI_FAILURE_INVALID_STATE;
break;
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_AWAIT_RESET:
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
case SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_IDLE:
status = scic_sds_port_start_io(sci_port, sci_dev, sci_req);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, sci_req);
if (status != SCI_SUCCESS)
break;
status = scic_sds_request_start(sci_req);
if (status != SCI_SUCCESS)
break;
sci_dev->working_request = sci_req;
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_CMD);
break;
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_CMD:
case SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_CMD:
/* device is already handling a command it can not accept new commands
* until this one is complete.
*/
return SCI_FAILURE_INVALID_STATE;
}
scic_sds_remote_device_start_request(sci_dev, sci_req, status);
return status;
}
/**
@ -409,32 +519,6 @@ static void remote_device_resume_done(void *_dev)
}
}
/**
*
* @device: This parameter specifies the device for which the request is being
* started.
* @request: This parameter specifies the request being started.
* @status: This parameter specifies the current start operation status.
*
* This method will perform the STP request start processing common to IO
* requests and task requests of all types. none
*/
static void scic_sds_remote_device_start_request(
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req,
enum sci_status status)
{
/* We still have a fault in starting the io complete it on the port */
if (status == SCI_SUCCESS)
scic_sds_remote_device_increment_request_count(sci_dev);
else{
sci_dev->owning_port->state_handlers->complete_io_handler(
sci_dev->owning_port, sci_dev, sci_req
);
}
}
/**
*
* @request: This parameter specifies the request being continued.
@ -699,35 +783,6 @@ static enum sci_status scic_sds_remote_device_ready_state_start_task_handler(
return result;
}
/*
* This method will attempt to start an io request for this device object. The
* remote device object will issue the start request for the io and if
* successful it will start the request for the port object then increment its
* own requet count. enum sci_status SCI_SUCCESS if the io request is started for
* this device object. SCI_FAILURE_INSUFFICIENT_RESOURCES if the io request
* object could not get the resources to start.
*/
static enum sci_status scic_sds_remote_device_ready_state_start_io_handler(
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *request)
{
enum sci_status result;
/* See if the port is in a state where we can start the IO request */
result = scic_sds_port_start_io(
scic_sds_remote_device_get_port(sci_dev), sci_dev, request);
if (result == SCI_SUCCESS) {
result = scic_sds_remote_node_context_start_io(&sci_dev->rnc, request);
if (result == SCI_SUCCESS)
result = scic_sds_request_start(request);
scic_sds_remote_device_start_request(sci_dev, request, result);
}
return result;
}
/*
* This method will complete the request for the remote device object. The
* method will call the completion handler for the request object and if
@ -920,48 +975,6 @@ static enum sci_status scic_sds_stp_remote_device_ready_substate_start_request_h
return SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS;
}
/* handle the start io operation for a sata device that is in the command idle
* state. - Evalute the type of IO request to be started - If its an NCQ
* request change to NCQ substate - If its any other command change to the CMD
* substate
*
* If this is a softreset we may want to have a different substate.
*/
static enum sci_status scic_sds_stp_remote_device_ready_idle_substate_start_io_handler(
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *request)
{
enum sci_status status;
struct isci_request *isci_request = request->ireq;
enum scic_sds_remote_device_states new_state;
/* Will the port allow the io request to start? */
status = sci_dev->owning_port->state_handlers->start_io_handler(
sci_dev->owning_port, sci_dev, request);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, request);
if (status != SCI_SUCCESS)
goto out;
status = request->state_handlers->start_handler(request);
if (status != SCI_SUCCESS)
goto out;
if (isci_sata_get_sat_protocol(isci_request) == SAT_PROTOCOL_FPDMA)
new_state = SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ;
else {
sci_dev->working_request = request;
new_state = SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_CMD;
}
sci_base_state_machine_change_state(&sci_dev->state_machine, new_state);
out:
scic_sds_remote_device_start_request(sci_dev, request, status);
return status;
}
static enum sci_status scic_sds_stp_remote_device_ready_idle_substate_event_handler(
struct scic_sds_remote_device *sci_dev,
u32 event_code)
@ -982,31 +995,6 @@ static enum sci_status scic_sds_stp_remote_device_ready_idle_substate_event_hand
return status;
}
static enum sci_status scic_sds_stp_remote_device_ready_ncq_substate_start_io_handler(
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *request)
{
enum sci_status status;
struct isci_request *isci_request = request->ireq;
scic_sds_port_io_request_handler_t start_io;
if (isci_sata_get_sat_protocol(isci_request) == SAT_PROTOCOL_FPDMA) {
start_io = sci_dev->owning_port->state_handlers->start_io_handler;
status = start_io(sci_dev->owning_port, sci_dev, request);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, request);
if (status == SCI_SUCCESS)
status = request->state_handlers->start_handler(request);
scic_sds_remote_device_start_request(sci_dev, request, status);
} else
status = SCI_FAILURE_INVALID_STATE;
return status;
}
static enum sci_status scic_sds_stp_remote_device_ready_ncq_substate_frame_handler(struct scic_sds_remote_device *sci_dev,
u32 frame_index)
{
@ -1046,16 +1034,6 @@ static enum sci_status scic_sds_stp_remote_device_ready_ncq_substate_frame_handl
return status;
}
static enum sci_status scic_sds_stp_remote_device_ready_cmd_substate_start_io_handler(
struct scic_sds_remote_device *device,
struct scic_sds_request *request)
{
/* device is already handling a command it can not accept new commands
* until this one is complete.
*/
return SCI_FAILURE_INVALID_STATE;
}
static enum sci_status scic_sds_stp_remote_device_ready_cmd_substate_suspend_handler(
struct scic_sds_remote_device *sci_dev,
u32 suspend_type)
@ -1080,13 +1058,6 @@ static enum sci_status scic_sds_stp_remote_device_ready_cmd_substate_frame_handl
frame_index);
}
static enum sci_status scic_sds_stp_remote_device_ready_await_reset_substate_start_io_handler(
struct scic_sds_remote_device *device,
struct scic_sds_request *request)
{
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
}
static enum sci_status scic_sds_stp_remote_device_ready_await_reset_substate_complete_request_handler(
struct scic_sds_remote_device *device,
struct scic_sds_request *request)
@ -1126,46 +1097,6 @@ static void scic_sds_stp_remote_device_ready_idle_substate_resume_complete_handl
isci_remote_device_ready(scic->ihost, idev);
}
static enum sci_status scic_sds_smp_remote_device_ready_idle_substate_start_io_handler(
struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req)
{
enum sci_status status;
/* Will the port allow the io request to start? */
status = sci_dev->owning_port->state_handlers->start_io_handler(
sci_dev->owning_port, sci_dev, sci_req);
if (status != SCI_SUCCESS)
return status;
status = scic_sds_remote_node_context_start_io(&sci_dev->rnc, sci_req);
if (status != SCI_SUCCESS)
goto out;
status = scic_sds_request_start(sci_req);
if (status != SCI_SUCCESS)
goto out;
sci_dev->working_request = sci_req;
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_CMD);
out:
scic_sds_remote_device_start_request(sci_dev, sci_req, status);
return status;
}
static enum sci_status scic_sds_smp_remote_device_ready_cmd_substate_start_io_handler(
struct scic_sds_remote_device *device,
struct scic_sds_request *request)
{
/* device is already handling a command it can not accept new commands
* until this one is complete.
*/
return SCI_FAILURE_INVALID_STATE;
}
static enum sci_status
scic_sds_smp_remote_device_ready_cmd_substate_complete_io_handler(struct scic_sds_remote_device *sci_dev,
struct scic_sds_request *sci_req)
@ -1213,7 +1144,6 @@ static enum sci_status scic_sds_smp_remote_device_ready_cmd_substate_frame_handl
static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_state_handler_table[] = {
[SCI_BASE_REMOTE_DEVICE_STATE_INITIAL] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1224,7 +1154,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_default_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_STOPPED] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1235,7 +1164,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_default_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_STARTING] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1246,7 +1174,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_default_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_READY] = {
.start_io_handler = scic_sds_remote_device_ready_state_start_io_handler,
.complete_io_handler = scic_sds_remote_device_ready_state_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_ready_state_start_task_handler,
@ -1257,7 +1184,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler,
},
[SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_IDLE] = {
.start_io_handler = scic_sds_stp_remote_device_ready_idle_substate_start_io_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_stp_remote_device_ready_substate_start_request_handler,
@ -1268,7 +1194,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_default_frame_handler
},
[SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_CMD] = {
.start_io_handler = scic_sds_stp_remote_device_ready_cmd_substate_start_io_handler,
.complete_io_handler = scic_sds_stp_remote_device_complete_request,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_stp_remote_device_ready_substate_start_request_handler,
@ -1279,7 +1204,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_stp_remote_device_ready_cmd_substate_frame_handler
},
[SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ] = {
.start_io_handler = scic_sds_stp_remote_device_ready_ncq_substate_start_io_handler,
.complete_io_handler = scic_sds_stp_remote_device_complete_request,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_stp_remote_device_ready_substate_start_request_handler,
@ -1290,7 +1214,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_stp_remote_device_ready_ncq_substate_frame_handler
},
[SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ_ERROR] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_stp_remote_device_complete_request,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_stp_remote_device_ready_substate_start_request_handler,
@ -1301,7 +1224,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler
},
[SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_AWAIT_RESET] = {
.start_io_handler = scic_sds_stp_remote_device_ready_await_reset_substate_start_io_handler,
.complete_io_handler = scic_sds_stp_remote_device_ready_await_reset_substate_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_stp_remote_device_ready_substate_start_request_handler,
@ -1312,7 +1234,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler
},
[SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_IDLE] = {
.start_io_handler = scic_sds_smp_remote_device_ready_idle_substate_start_io_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1323,7 +1244,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_default_frame_handler
},
[SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_CMD] = {
.start_io_handler = scic_sds_smp_remote_device_ready_cmd_substate_start_io_handler,
.complete_io_handler = scic_sds_smp_remote_device_ready_cmd_substate_complete_io_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1334,7 +1254,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_smp_remote_device_ready_cmd_substate_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_STOPPING] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_stopping_state_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1345,7 +1264,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_FAILED] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1356,7 +1274,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_RESETTING] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_resetting_state_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,
@ -1367,7 +1284,6 @@ static const struct scic_sds_remote_device_state_handler scic_sds_remote_device_
.frame_handler = scic_sds_remote_device_general_frame_handler
},
[SCI_BASE_REMOTE_DEVICE_STATE_FINAL] = {
.start_io_handler = scic_sds_remote_device_default_start_request_handler,
.complete_io_handler = scic_sds_remote_device_default_complete_request_handler,
.continue_io_handler = scic_sds_remote_device_default_continue_request_handler,
.start_task_handler = scic_sds_remote_device_default_start_request_handler,

6
drivers/scsi/isci/remote_device.h
View File

@ -386,12 +386,6 @@ typedef void (*scic_sds_remote_device_ready_not_ready_handler_t)(
*
*/
struct scic_sds_remote_device_state_handler {
/**
* The start_io_handler specifies the method invoked when a user
* attempts to start an IO request for a remote device.
*/
scic_sds_remote_device_request_handler_t start_io_handler;
/**
* The complete_io_handler specifies the method invoked when a user
* attempts to complete an IO request for a remote device.