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isci: unify remote_device stop_handlers

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Implement all states in scic_remote_device_stop() and delete the state
handlers.

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 14:19:25 -07:00
parent eb229671b1
commit ec5756699b
2 changed files with 85 additions and 179 deletions
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252
drivers/scsi/isci/remote_device.c
View File

@ -129,13 +129,91 @@ static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote
wake_up(&ihost->eventq);
}
/* called once the remote node context is ready to be freed.
* The remote device can now report that its stop operation is complete. none
*/
static void rnc_destruct_done(void *_dev)
{
struct scic_sds_remote_device *sci_dev = _dev;
BUG_ON(sci_dev->started_request_count != 0);
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCI_BASE_REMOTE_DEVICE_STATE_STOPPED);
}
enum sci_status scic_remote_device_stop(
struct scic_sds_remote_device *sci_dev,
static enum sci_status scic_sds_remote_device_terminate_requests(struct scic_sds_remote_device *sci_dev)
{
struct scic_sds_controller *scic = sci_dev->owning_port->owning_controller;
u32 i, request_count = sci_dev->started_request_count;
enum sci_status status = SCI_SUCCESS;
for (i = 0; i < SCI_MAX_IO_REQUESTS && i < request_count; i++) {
struct scic_sds_request *sci_req;
enum sci_status s;
sci_req = scic->io_request_table[i];
if (!sci_req || sci_req->target_device != sci_dev)
continue;
s = scic_controller_terminate_request(scic, sci_dev, sci_req);
if (s != SCI_SUCCESS)
status = s;
}
return status;
}
enum sci_status scic_remote_device_stop(struct scic_sds_remote_device *sci_dev,
u32 timeout)
{
return sci_dev->state_handlers->stop_handler(sci_dev);
struct sci_base_state_machine *sm = &sci_dev->state_machine;
enum scic_sds_remote_device_states state = sm->current_state_id;
switch (state) {
case SCI_BASE_REMOTE_DEVICE_STATE_INITIAL:
case SCI_BASE_REMOTE_DEVICE_STATE_FAILED:
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_STOPPED:
return SCI_SUCCESS;
case SCI_BASE_REMOTE_DEVICE_STATE_STARTING:
/* device not started so there had better be no requests */
BUG_ON(sci_dev->started_request_count != 0);
scic_sds_remote_node_context_destruct(&sci_dev->rnc,
rnc_destruct_done, sci_dev);
/* Transition to the stopping state and wait for the
* remote node to complete being posted and invalidated.
*/
sci_base_state_machine_change_state(sm, SCI_BASE_REMOTE_DEVICE_STATE_STOPPING);
return SCI_SUCCESS;
case SCI_BASE_REMOTE_DEVICE_STATE_READY:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_IDLE:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_CMD:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_NCQ_ERROR:
case SCIC_SDS_STP_REMOTE_DEVICE_READY_SUBSTATE_AWAIT_RESET:
case SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_IDLE:
case SCIC_SDS_SMP_REMOTE_DEVICE_READY_SUBSTATE_CMD:
sci_base_state_machine_change_state(sm, SCI_BASE_REMOTE_DEVICE_STATE_STOPPING);
if (sci_dev->started_request_count == 0) {
scic_sds_remote_node_context_destruct(&sci_dev->rnc,
rnc_destruct_done, sci_dev);
return SCI_SUCCESS;
} else
return scic_sds_remote_device_terminate_requests(sci_dev);
break;
case SCI_BASE_REMOTE_DEVICE_STATE_STOPPING:
/* All requests should have been terminated, but if there is an
* attempt to stop a device already in the stopping state, then
* try again to terminate.
*/
return scic_sds_remote_device_terminate_requests(sci_dev);
case SCI_BASE_REMOTE_DEVICE_STATE_RESETTING:
sci_base_state_machine_change_state(sm, SCI_BASE_REMOTE_DEVICE_STATE_STOPPING);
return SCI_SUCCESS;
}
}
@ -275,18 +353,6 @@ void scic_sds_remote_device_post_request(
);
}
/* called once the remote node context is ready to be freed.
* The remote device can now report that its stop operation is complete. none
*/
static void scic_sds_cb_remote_device_rnc_destruct_complete(void *_dev)
{
struct scic_sds_remote_device *sci_dev = _dev;
BUG_ON(sci_dev->started_request_count != 0);
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCI_BASE_REMOTE_DEVICE_STATE_STOPPED);
}
/* called once the remote node context has transisitioned to a
* ready state. This is the indication that the remote device object can also
* transition to ready.
@ -358,47 +424,6 @@ static void scic_sds_remote_device_continue_request(void *dev)
scic_controller_continue_io(sci_dev->working_request);
}
/**
* This method will terminate all of the IO requests in the controllers IO
* request table that were targeted for this device.
* @sci_dev: This parameter specifies the remote device for which to
* attempt to terminate all requests.
*
* This method returns an indication as to whether all requests were
* successfully terminated. If a single request fails to be terminated, then
* this method will return the failure.
*/
static enum sci_status scic_sds_remote_device_terminate_requests(
struct scic_sds_remote_device *sci_dev)
{
enum sci_status status = SCI_SUCCESS;
enum sci_status terminate_status = SCI_SUCCESS;
struct scic_sds_request *sci_req;
u32 index;
u32 request_count = sci_dev->started_request_count;
for (index = 0;
(index < SCI_MAX_IO_REQUESTS) && (request_count > 0);
index++) {
sci_req = sci_dev->owning_port->owning_controller->io_request_table[index];
if ((sci_req != NULL) && (sci_req->target_device == sci_dev)) {
terminate_status = scic_controller_terminate_request(
sci_dev->owning_port->owning_controller,
sci_dev,
sci_req
);
if (terminate_status != SCI_SUCCESS)
status = terminate_status;
request_count--;
}
}
return status;
}
static enum sci_status
default_device_handler(struct scic_sds_remote_device *sci_dev,
const char *func)
@ -409,12 +434,6 @@ default_device_handler(struct scic_sds_remote_device *sci_dev,
return SCI_FAILURE_INVALID_STATE;
}
static enum sci_status scic_sds_remote_device_default_stop_handler(
struct scic_sds_remote_device *sci_dev)
{
return default_device_handler(sci_dev, __func__);
}
static enum sci_status scic_sds_remote_device_default_fail_handler(
struct scic_sds_remote_device *sci_dev)
{
@ -646,12 +665,6 @@ static enum sci_status scic_sds_remote_device_general_event_handler(
true);
}
static enum sci_status scic_sds_remote_device_stopped_state_stop_handler(
struct scic_sds_remote_device *sci_dev)
{
return SCI_SUCCESS;
}
/**
*
* @sci_dev: The struct scic_sds_remote_device which is cast into a
@ -679,54 +692,6 @@ static enum sci_status scic_sds_remote_device_stopped_state_destruct_handler(
return SCI_SUCCESS;
}
/*
* *****************************************************************************
* * STARTING STATE HANDLERS
* ***************************************************************************** */
static enum sci_status scic_sds_remote_device_starting_state_stop_handler(
struct scic_sds_remote_device *sci_dev)
{
/*
* This device has not yet started so there had better be no IO requests
*/
BUG_ON(sci_dev->started_request_count != 0);
/*
* Destroy the remote node context
*/
scic_sds_remote_node_context_destruct(&sci_dev->rnc,
scic_sds_cb_remote_device_rnc_destruct_complete, sci_dev);
/*
* Transition to the stopping state and wait for the remote node to
* complete being posted and invalidated.
*/
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCI_BASE_REMOTE_DEVICE_STATE_STOPPING);
return SCI_SUCCESS;
}
static enum sci_status scic_sds_remote_device_ready_state_stop_handler(
struct scic_sds_remote_device *sci_dev)
{
enum sci_status status = SCI_SUCCESS;
/* Request the parent state machine to transition to the stopping state */
sci_base_state_machine_change_state(&sci_dev->state_machine,
SCI_BASE_REMOTE_DEVICE_STATE_STOPPING);
if (sci_dev->started_request_count == 0) {
scic_sds_remote_node_context_destruct(&sci_dev->rnc,
scic_sds_cb_remote_device_rnc_destruct_complete,
sci_dev);
} else
status = scic_sds_remote_device_terminate_requests(sci_dev);
return status;
}
/**
*
* @device: The struct scic_sds_remote_device object which is cast to a
@ -832,32 +797,6 @@ static enum sci_status scic_sds_remote_device_ready_state_complete_request_handl
return result;
}
/*
* *****************************************************************************
* * STOPPING STATE HANDLERS
* ***************************************************************************** */
/**
*
* @sci_dev: The struct scic_sds_remote_device which is cast into a
* struct scic_sds_remote_device.
*
* This method will stop a struct scic_sds_remote_device that is already in the
* SCI_BASE_REMOTE_DEVICE_STATE_STOPPING state. This is not considered an error
* since we allow a stop request on a device that is alreay stopping or
* stopped. enum sci_status SCI_SUCCESS
*/
static enum sci_status scic_sds_remote_device_stopping_state_stop_handler(
struct scic_sds_remote_device *device)
{
/*
* All requests should have been terminated, but if there is an
* attempt to stop a device already in the stopping state, then
* try again to terminate. */
return scic_sds_remote_device_terminate_requests(device);
}
/**
*
* @device: The device object for which the request is completing.
@ -891,8 +830,7 @@ static enum sci_status scic_sds_remote_device_stopping_state_complete_request_ha
if (scic_sds_remote_device_get_request_count(sci_dev) == 0)
scic_sds_remote_node_context_destruct(&sci_dev->rnc,
scic_sds_cb_remote_device_rnc_destruct_complete,
sci_dev);
rnc_destruct_done, sci_dev);
return SCI_SUCCESS;
}
@ -905,17 +843,6 @@ static enum sci_status scic_sds_remote_device_resetting_state_reset_complete_han
return SCI_SUCCESS;
}
static enum sci_status scic_sds_remote_device_resetting_state_stop_handler(
struct scic_sds_remote_device *sci_dev)
{
sci_base_state_machine_change_state(
&sci_dev->state_machine,
SCI_BASE_REMOTE_DEVICE_STATE_STOPPING
);
return SCI_SUCCESS;
}
/* complete requests for this device while it is in the
* SCI_BASE_REMOTE_DEVICE_STATE_RESETTING state. This method calls the complete
* method for the request object and if that is successful the port object is
@ -1335,7 +1262,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_default_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1351,7 +1277,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_stopped_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_stopped_state_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1367,7 +1292,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_starting_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1383,7 +1307,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1399,7 +1322,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1415,7 +1337,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1431,7 +1352,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1447,7 +1367,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1463,7 +1382,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_ready_state_reset_handler,
@ -1479,7 +1397,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1495,7 +1412,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_ready_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1511,7 +1427,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_stopping_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1527,7 +1442,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_default_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1543,7 +1457,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_resetting_state_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_handler,
@ -1559,7 +1472,6 @@ 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] = {
.stop_handler = scic_sds_remote_device_default_stop_handler,
.fail_handler = scic_sds_remote_device_default_fail_handler,
.destruct_handler = scic_sds_remote_device_default_destruct_handler,
.reset_handler = scic_sds_remote_device_default_reset_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 stop_handler specifies the method invoked when a user attempts to
* stop a remote device.
*/
scic_sds_remote_device_handler_t stop_handler;
/**
* The fail_handler specifies the method invoked when a remote device
* failure has occurred. A failure may be due to an inability to