enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_INVALIDATING:
sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
return SCI_SUCCESS;
case SCI_RNC_POSTING:
case SCI_RNC_RESUMING:
case SCI_RNC_READY:
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_TX_RX_SUSPENDED:
case SCI_RNC_AWAIT_SUSPENSION:
sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
return SCI_SUCCESS;
case SCI_RNC_INITIAL:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
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;
}
}
enum sci_status sci_remote_node_context_destruct(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_INVALIDATING:
sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
return SCI_SUCCESS;
case SCI_RNC_POSTING:
case SCI_RNC_RESUMING:
case SCI_RNC_READY:
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_TX_RX_SUSPENDED:
case SCI_RNC_AWAIT_SUSPENSION:
sci_remote_node_context_setup_to_destory(sci_rnc, cb_fn, cb_p);
sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
return SCI_SUCCESS;
case SCI_RNC_INITIAL:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
/* We have decided that the destruct request on the remote node context
* can not fail since it is either in the initial/destroyed state or is
* can be destroyed.
*/
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;
}
}
enum sci_status sci_remote_node_context_suspend(struct sci_remote_node_context *sci_rnc,
u32 suspend_type,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
if (state != SCI_RNC_READY) {
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
sci_rnc->user_callback = cb_fn;
sci_rnc->user_cookie = cb_p;
sci_rnc->suspension_code = suspend_type;
if (suspend_type == SCI_SOFTWARE_SUSPENSION) {
sci_remote_device_post_request(rnc_to_dev(sci_rnc),
SCU_CONTEXT_COMMAND_POST_RNC_SUSPEND_TX);
}
sci_change_state(&sci_rnc->sm, SCI_RNC_AWAIT_SUSPENSION);
return SCI_SUCCESS;
}
enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_INITIAL:
if (sci_rnc->remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
return SCI_FAILURE_INVALID_STATE;
sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
sci_remote_node_context_construct_buffer(sci_rnc);
sci_change_state(&sci_rnc->sm, SCI_RNC_POSTING);
return SCI_SUCCESS;
case SCI_RNC_POSTING:
case SCI_RNC_INVALIDATING:
case SCI_RNC_RESUMING:
if (sci_rnc->destination_state != SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_READY)
return SCI_FAILURE_INVALID_STATE;
sci_rnc->user_callback = cb_fn;
sci_rnc->user_cookie = cb_p;
return SCI_SUCCESS;
case SCI_RNC_TX_SUSPENDED: {
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
struct domain_device *dev = idev->domain_dev;
sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
/* TODO: consider adding a resume action of NONE, INVALIDATE, WRITE_TLCR */
if (dev->dev_type == SAS_END_DEV || dev_is_expander(dev))
sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
else if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
if (idev->is_direct_attached) {
/* @todo Fix this since I am being silly in writing to the STPTLDARNI register. */
sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
} else {
sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
}
} else
return SCI_FAILURE;
return SCI_SUCCESS;
}
case SCI_RNC_TX_RX_SUSPENDED:
sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
sci_change_state(&sci_rnc->sm, SCI_RNC_RESUMING);
return SCI_FAILURE_INVALID_STATE;
case SCI_RNC_AWAIT_SUSPENSION:
sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p);
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;
}
}
enum sci_status sci_remote_node_context_start_task(
struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum sci_status status = sci_remote_node_context_resume(sci_rnc,
cb_fn, cb_p);
if (status != SCI_SUCCESS)
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: resume failed: %d\n", __func__, status);
return status;
}
enum sci_status sci_remote_node_context_start_io(struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_READY:
return SCI_SUCCESS;
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_TX_RX_SUSPENDED:
case SCI_RNC_AWAIT_SUSPENSION:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
default:
break;
}
dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: requested to start IO while still resuming, %d\n",
__func__, state);
return SCI_FAILURE_INVALID_STATE;
}
enum sci_status sci_remote_node_context_start_task(struct sci_remote_node_context *sci_rnc,
struct isci_request *ireq)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_RESUMING:
case SCI_RNC_READY:
case SCI_RNC_AWAIT_SUSPENSION:
return SCI_SUCCESS;
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_TX_RX_SUSPENDED:
sci_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;
}
}
int sci_remote_node_context_is_safe_to_abort(
struct sci_remote_node_context *sci_rnc)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_INVALIDATING:
case SCI_RNC_TX_RX_SUSPENDED:
return 1;
case SCI_RNC_POSTING:
case SCI_RNC_RESUMING:
case SCI_RNC_READY:
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_AWAIT_SUSPENSION:
case SCI_RNC_INITIAL:
return 0;
default:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return 0;
}
}
enum sci_status sci_remote_node_context_event_handler(struct sci_remote_node_context *sci_rnc,
u32 event_code)
{
enum scis_sds_remote_node_context_states state;
state = sci_rnc->sm.current_state_id;
switch (state) {
case SCI_RNC_POSTING:
switch (scu_get_event_code(event_code)) {
case SCU_EVENT_POST_RNC_COMPLETE:
sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
break;
default:
goto out;
}
break;
case SCI_RNC_INVALIDATING:
if (scu_get_event_code(event_code) == SCU_EVENT_POST_RNC_INVALIDATE_COMPLETE) {
if (sci_rnc->destination_state == SCIC_SDS_REMOTE_NODE_DESTINATION_STATE_FINAL)
state = SCI_RNC_INITIAL;
else
state = SCI_RNC_POSTING;
sci_change_state(&sci_rnc->sm, state);
} else {
switch (scu_get_event_type(event_code)) {
case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
/* We really dont care if the hardware is going to suspend
* the device since it's being invalidated anyway */
dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: SCIC Remote Node Context 0x%p was "
"suspeneded by hardware while being "
"invalidated.\n", __func__, sci_rnc);
break;
default:
goto out;
}
}
break;
case SCI_RNC_RESUMING:
if (scu_get_event_code(event_code) == SCU_EVENT_POST_RCN_RELEASE) {
sci_change_state(&sci_rnc->sm, SCI_RNC_READY);
} else {
switch (scu_get_event_type(event_code)) {
case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
/* We really dont care if the hardware is going to suspend
* the device since it's being resumed anyway */
dev_dbg(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: SCIC Remote Node Context 0x%p was "
"suspeneded by hardware while being resumed.\n",
__func__, sci_rnc);
break;
default:
goto out;
}
}
break;
case SCI_RNC_READY:
switch (scu_get_event_type(event_code)) {
case SCU_EVENT_TL_RNC_SUSPEND_TX:
sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
sci_rnc->suspension_code = scu_get_event_specifier(event_code);
break;
case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
sci_rnc->suspension_code = scu_get_event_specifier(event_code);
break;
default:
goto out;
}
break;
case SCI_RNC_AWAIT_SUSPENSION:
switch (scu_get_event_type(event_code)) {
case SCU_EVENT_TL_RNC_SUSPEND_TX:
sci_change_state(&sci_rnc->sm, SCI_RNC_TX_SUSPENDED);
sci_rnc->suspension_code = scu_get_event_specifier(event_code);
break;
case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
sci_rnc->suspension_code = scu_get_event_specifier(event_code);
break;
default:
goto out;
}
break;
default:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %d\n", __func__, state);
return SCI_FAILURE_INVALID_STATE;
}
return SCI_SUCCESS;
out:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: code: %#x state: %d\n", __func__, event_code, state);
return SCI_FAILURE;
}
enum sci_status sci_remote_node_context_resume(struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback cb_fn,
void *cb_p)
{
enum scis_sds_remote_node_context_states state;
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
state = sci_rnc->sm.current_state_id;
dev_dbg(scirdev_to_dev(idev),
"%s: state %s, cb_fn = %p, cb_p = %p; dest_state = %d; "
"dev resume path %s\n",
__func__, rnc_state_name(state), cb_fn, cb_p,
sci_rnc->destination_state,
test_bit(IDEV_ABORT_PATH_ACTIVE, &idev->flags)
? "<abort active>" : "<normal>");
switch (state) {
case SCI_RNC_INITIAL:
if (sci_rnc->remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
return SCI_FAILURE_INVALID_STATE;
sci_remote_node_context_setup_to_resume(sci_rnc, cb_fn, cb_p,
RNC_DEST_READY);
if (!test_bit(IDEV_ABORT_PATH_ACTIVE, &idev->flags)) {
sci_remote_node_context_construct_buffer(sci_rnc);
sci_change_state(&sci_rnc->sm, SCI_RNC_POSTING);
}
return SCI_SUCCESS;
case SCI_RNC_POSTING:
case SCI_RNC_INVALIDATING:
case SCI_RNC_RESUMING:
/* We are still waiting to post when a resume was
* requested.
*/
switch (sci_rnc->destination_state) {
case RNC_DEST_SUSPENDED:
case RNC_DEST_SUSPENDED_RESUME:
/* Previously waiting to suspend after posting.
* Now continue onto resumption.
*/
sci_remote_node_context_setup_to_resume(
sci_rnc, cb_fn, cb_p,
RNC_DEST_SUSPENDED_RESUME);
break;
default:
sci_remote_node_context_setup_to_resume(
sci_rnc, cb_fn, cb_p,
RNC_DEST_READY);
break;
}
return SCI_SUCCESS;
case SCI_RNC_TX_SUSPENDED:
case SCI_RNC_TX_RX_SUSPENDED:
{
struct domain_device *dev = idev->domain_dev;
/* If this is an expander attached SATA device we must
* invalidate and repost the RNC since this is the only
* way to clear the TCi to NCQ tag mapping table for
* the RNi. All other device types we can just resume.
*/
sci_remote_node_context_setup_to_resume(
sci_rnc, cb_fn, cb_p, RNC_DEST_READY);
if (!test_bit(IDEV_ABORT_PATH_ACTIVE, &idev->flags)) {
if ((dev_is_sata(dev) && dev->parent) ||
(sci_rnc->destination_state == RNC_DEST_FINAL))
sci_change_state(&sci_rnc->sm,
SCI_RNC_INVALIDATING);
else
sci_change_state(&sci_rnc->sm,
SCI_RNC_RESUMING);
}
}
return SCI_SUCCESS;
case SCI_RNC_AWAIT_SUSPENSION:
sci_remote_node_context_setup_to_resume(
sci_rnc, cb_fn, cb_p, RNC_DEST_SUSPENDED_RESUME);
return SCI_SUCCESS;
default:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %s\n", __func__,
rnc_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
}
enum sci_status sci_remote_node_context_suspend(
struct sci_remote_node_context *sci_rnc,
enum sci_remote_node_suspension_reasons suspend_reason,
u32 suspend_type)
{
enum scis_sds_remote_node_context_states state
= sci_rnc->sm.current_state_id;
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
enum sci_status status = SCI_FAILURE_INVALID_STATE;
enum sci_remote_node_context_destination_state dest_param =
RNC_DEST_UNSPECIFIED;
dev_dbg(scirdev_to_dev(idev),
"%s: current state %s, current suspend_type %x dest state %d,"
" arg suspend_reason %d, arg suspend_type %x",
__func__, rnc_state_name(state), sci_rnc->suspend_type,
sci_rnc->destination_state, suspend_reason,
suspend_type);
/* Disable automatic state continuations if explicitly suspending. */
if ((suspend_reason == SCI_HW_SUSPEND) ||
(sci_rnc->destination_state == RNC_DEST_FINAL))
dest_param = sci_rnc->destination_state;
switch (state) {
case SCI_RNC_READY:
break;
case SCI_RNC_INVALIDATING:
if (sci_rnc->destination_state == RNC_DEST_FINAL) {
dev_warn(scirdev_to_dev(idev),
"%s: already destroying %p\n",
__func__, sci_rnc);
return SCI_FAILURE_INVALID_STATE;
}
/* Fall through and handle like SCI_RNC_POSTING */
case SCI_RNC_RESUMING:
/* Fall through and handle like SCI_RNC_POSTING */
case SCI_RNC_POSTING:
/* Set the destination state to AWAIT - this signals the
* entry into the SCI_RNC_READY state that a suspension
* needs to be done immediately.
*/
if (sci_rnc->destination_state != RNC_DEST_FINAL)
sci_rnc->destination_state = RNC_DEST_SUSPENDED;
sci_rnc->suspend_type = suspend_type;
sci_rnc->suspend_reason = suspend_reason;
return SCI_SUCCESS;
case SCI_RNC_TX_SUSPENDED:
if (suspend_type == SCU_EVENT_TL_RNC_SUSPEND_TX)
status = SCI_SUCCESS;
break;
case SCI_RNC_TX_RX_SUSPENDED:
if (suspend_type == SCU_EVENT_TL_RNC_SUSPEND_TX_RX)
status = SCI_SUCCESS;
break;
case SCI_RNC_AWAIT_SUSPENSION:
if ((sci_rnc->suspend_type == SCU_EVENT_TL_RNC_SUSPEND_TX_RX)
|| (suspend_type == sci_rnc->suspend_type))
return SCI_SUCCESS;
break;
default:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state %s\n", __func__,
rnc_state_name(state));
return SCI_FAILURE_INVALID_STATE;
}
sci_rnc->destination_state = dest_param;
sci_rnc->suspend_type = suspend_type;
sci_rnc->suspend_reason = suspend_reason;
if (status == SCI_SUCCESS) { /* Already in the destination state? */
struct isci_host *ihost = idev->owning_port->owning_controller;
wake_up_all(&ihost->eventq); /* Let observers look. */
return SCI_SUCCESS;
}
if ((suspend_reason == SCI_SW_SUSPEND_NORMAL) ||
(suspend_reason == SCI_SW_SUSPEND_LINKHANG_DETECT)) {
if (suspend_reason == SCI_SW_SUSPEND_LINKHANG_DETECT)
isci_dev_set_hang_detection_timeout(idev, 0x00000001);
sci_remote_device_post_request(
idev, SCI_SOFTWARE_SUSPEND_CMD);
}
if (state != SCI_RNC_AWAIT_SUSPENSION)
sci_change_state(&sci_rnc->sm, SCI_RNC_AWAIT_SUSPENSION);
return SCI_SUCCESS;
}