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isci: unify rnc start{io|task} handlers
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Unify rnc start{io|task} handlers and delete the state handler
infrastructure.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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@djbw
djbw committed Jul 3, 2011
1 parent ed3efb7 commit f34d9e5
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Showing 3 changed files with 47 additions and 307 deletions.
306 changes: 43 additions & 263 deletions drivers/scsi/isci/remote_node_context.c
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Original file line number Diff line number Diff line change
Expand Up @@ -176,15 +176,6 @@ static void scic_sds_remote_node_context_setup_to_resume(
}
}

/**
*
* @sci_rnc:
* @callback:
* @callback_parameter:
*
* This method will setup the remote node context object so it will transistion
* to its final state. none
*/
static void scic_sds_remote_node_context_setup_to_destory(
struct scic_sds_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback callback,
Expand All @@ -195,146 +186,6 @@ static void scic_sds_remote_node_context_setup_to_destory(
sci_rnc->user_cookie = callback_parameter;
}

static enum sci_status scic_sds_remote_node_context_default_start_io_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: SCIC Remote Node Context 0x%p requested to start io "
"0x%p while in wrong state %d\n",
__func__,
sci_rnc,
sci_req,
sci_base_state_machine_get_state(&sci_rnc->state_machine));

return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
}

static enum sci_status scic_sds_remote_node_context_default_start_task_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: SCIC Remote Node Context 0x%p requested to start "
"task 0x%p while in wrong state %d\n",
__func__,
sci_rnc,
sci_req,
sci_base_state_machine_get_state(&sci_rnc->state_machine));

return SCI_FAILURE;
}

/**
*
* @sci_rnc: The rnc for which the task request is targeted.
* @sci_req: The request which is going to be started.
*
* This method determines if the task request can be started by the SCU
* hardware. When the RNC is in the ready state any task can be started.
* enum sci_status SCI_SUCCESS
*/
static enum sci_status scic_sds_remote_node_context_success_start_task_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
return SCI_SUCCESS;
}

/**
*
* @sci_rnc: The rnc for which the io request is targeted.
* @sci_req: The request which is going to be started.
*
* This method determines if the io request can be started by the SCU hardware.
* When the RNC is in the ready state any io request can be started. enum sci_status
* SCI_SUCCESS
*/
static enum sci_status scic_sds_remote_node_context_ready_state_start_io_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
return SCI_SUCCESS;
}

/**
*
* @sci_rnc: The remote node context which is to receive the task request.
* @sci_req: The task request to be transmitted to to the remote target
* device.
*
* This method will report a success or failure attempt to start a new task
* request to the hardware. Since all task requests are sent on the high
* priority queue they can be sent when the RCN is in a TX suspend state.
* enum sci_status SCI_SUCCESS
*/
static enum sci_status scic_sds_remote_node_context_suspended_start_task_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
scic_sds_remote_node_context_resume(sci_rnc, NULL, NULL);

return SCI_SUCCESS;
}

/**
*
* @sci_rnc: The remote node context which is to receive the task request.
* @sci_req: The task request to be transmitted to to the remote target
* device.
*
* This method will report a success or failure attempt to start a new task
* request to the hardware. Since all task requests are sent on the high
* priority queue they can be sent when the RCN is in a TX suspend state.
* enum sci_status SCI_SUCCESS
*/
static enum sci_status scic_sds_remote_node_context_await_suspension_state_start_task_handler(
struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
return SCI_SUCCESS;
}

static struct scic_sds_remote_node_context_handlers scic_sds_remote_node_context_state_handler_table[] = {
[SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_default_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_default_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_default_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_success_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE] = {
.start_io_handler = scic_sds_remote_node_context_ready_state_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_success_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_suspended_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_suspended_start_task_handler,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = {
.start_io_handler = scic_sds_remote_node_context_default_start_io_handler,
.start_task_handler = scic_sds_remote_node_context_await_suspension_state_start_task_handler,
}
};

/*
* *****************************************************************************
* * REMOTE NODE CONTEXT PRIVATE METHODS
* ***************************************************************************** */

/**
*
*
Expand Down Expand Up @@ -415,80 +266,34 @@ static void scic_sds_remote_node_context_invalidate_context_buffer(
SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
}

/*
* *****************************************************************************
* * REMOTE NODE CONTEXT STATE ENTER AND EXIT METHODS
* ***************************************************************************** */

/**
*
*
*
*/
static void scic_sds_remote_node_context_initial_state_enter(void *object)
{
struct scic_sds_remote_node_context *rnc = object;
struct sci_base_state_machine *sm = &rnc->state_machine;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE
);

/*
* Check to see if we have gotten back to the initial state because someone
* requested to destroy the remote node context object. */
if (
rnc->state_machine.previous_state_id
== SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE
) {
/* Check to see if we have gotten back to the initial state because
* someone requested to destroy the remote node context object.
*/
if (sm->previous_state_id == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE) {
rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;

scic_sds_remote_node_context_notify_user(rnc);
}
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_posting_state_enter(void *object)
{
struct scic_sds_remote_node_context *sci_rnc = object;

SET_STATE_HANDLER(
sci_rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_POSTING_STATE
);

scic_sds_remote_node_context_validate_context_buffer(sci_rnc);
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_invalidating_state_enter(void *object)
{
struct scic_sds_remote_node_context *rnc = object;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_INVALIDATING_STATE
);

scic_sds_remote_node_context_invalidate_context_buffer(rnc);
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_resuming_state_enter(void *object)
{
struct scic_sds_remote_node_context *rnc = object;
Expand All @@ -498,12 +303,6 @@ static void scic_sds_remote_node_context_resuming_state_enter(void *object)
sci_dev = rnc_to_dev(rnc);
dev = sci_dev_to_domain(sci_dev);

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE
);

/*
* For direct attached SATA devices we need to clear the TLCR
* NCQ to TCi tag mapping on the phy and in cases where we
Expand All @@ -518,84 +317,31 @@ static void scic_sds_remote_node_context_resuming_state_enter(void *object)
scic_sds_remote_device_post_request(sci_dev, SCU_CONTEXT_COMMAND_POST_RNC_RESUME);
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_ready_state_enter(void *object)
{
struct scic_sds_remote_node_context *rnc = object;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE
);

rnc->destination_state = SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_UNSPECIFIED;

if (rnc->user_callback != NULL) {
if (rnc->user_callback)
scic_sds_remote_node_context_notify_user(rnc);
}
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_tx_suspended_state_enter(void *object)
{
struct scic_sds_remote_node_context *rnc = object;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE
);

scic_sds_remote_node_context_continue_state_transitions(rnc);
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_tx_rx_suspended_state_enter(
void *object)
{
struct scic_sds_remote_node_context *rnc = object;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE
);

scic_sds_remote_node_context_continue_state_transitions(rnc);
}

/**
*
*
*
*/
static void scic_sds_remote_node_context_await_suspension_state_enter(
void *object)
{
struct scic_sds_remote_node_context *rnc = object;

SET_STATE_HANDLER(
rnc,
scic_sds_remote_node_context_state_handler_table,
SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE
);
}

/* --------------------------------------------------------------------------- */

static const struct sci_base_state scic_sds_remote_node_context_state_table[] = {
[SCIC_SDS_REMOTE_NODE_CONTEXT_INITIAL_STATE] = {
.enter_state = scic_sds_remote_node_context_initial_state_enter,
Expand All @@ -618,9 +364,7 @@ static const struct sci_base_state scic_sds_remote_node_context_state_table[] =
[SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE] = {
.enter_state = scic_sds_remote_node_context_tx_rx_suspended_state_enter,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = {
.enter_state = scic_sds_remote_node_context_await_suspension_state_enter,
},
[SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE] = { },
};

void scic_sds_remote_node_context_construct(struct scic_sds_remote_node_context *rnc,
Expand Down Expand Up @@ -875,3 +619,39 @@ enum sci_status scic_sds_remote_node_context_resume(struct scic_sds_remote_node_
return SCI_FAILURE_INVALID_STATE;
}
}

enum sci_status scic_sds_remote_node_context_start_io(struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
enum scis_sds_remote_node_context_states state;

state = sci_rnc->state_machine.current_state_id;
if (state != SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE) {
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
}
return SCI_SUCCESS;
}

enum sci_status scic_sds_remote_node_context_start_task(struct scic_sds_remote_node_context *sci_rnc,
struct scic_sds_request *sci_req)
{
enum scis_sds_remote_node_context_states state;

state = sci_rnc->state_machine.current_state_id;
switch (state) {
case SCIC_SDS_REMOTE_NODE_CONTEXT_RESUMING_STATE:
case SCIC_SDS_REMOTE_NODE_CONTEXT_READY_STATE:
case SCIC_SDS_REMOTE_NODE_CONTEXT_AWAIT_SUSPENSION_STATE:
return SCI_SUCCESS;
case SCIC_SDS_REMOTE_NODE_CONTEXT_TX_SUSPENDED_STATE:
case SCIC_SDS_REMOTE_NODE_CONTEXT_TX_RX_SUSPENDED_STATE:
scic_sds_remote_node_context_resume(sci_rnc, NULL, NULL);
return SCI_SUCCESS;
default:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
}
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