- 根目录:
- drivers
- scsi
- isci
- remote_node_context.c
/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <scsi/sas_ata.h>
#include "host.h"
#include "isci.h"
#include "remote_device.h"
#include "remote_node_context.h"
#include "scu_event_codes.h"
#include "scu_task_context.h"
#undef C
#define C(a) (#a)
const char *rnc_state_name(enum scis_sds_remote_node_context_states state)
{
static const char * const strings[] = RNC_STATES;
return strings[state];
}
#undef C
/**
*
* @sci_rnc: The state of the remote node context object to check.
*
* This method will return true if the remote node context is in a READY state
* otherwise it will return false bool true if the remote node context is in
* the ready state. false if the remote node context is not in the ready state.
*/
bool sci_remote_node_context_is_ready(
struct sci_remote_node_context *sci_rnc)
{
u32 current_state = sci_rnc->sm.current_state_id;
if (current_state == SCI_RNC_READY) {
return true;
}
return false;
}
bool sci_remote_node_context_is_suspended(struct sci_remote_node_context *sci_rnc)
{
u32 current_state = sci_rnc->sm.current_state_id;
if (current_state == SCI_RNC_TX_RX_SUSPENDED)
return true;
return false;
}
static union scu_remote_node_context *sci_rnc_by_id(struct isci_host *ihost, u16 id)
{
if (id < ihost->remote_node_entries &&
ihost->device_table[id])
return &ihost->remote_node_context_table[id];
return NULL;
}
static void sci_remote_node_context_construct_buffer(struct sci_remote_node_context *sci_rnc)
{
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
struct domain_device *dev = idev->domain_dev;
int rni = sci_rnc->remote_node_index;
union scu_remote_node_context *rnc;
struct isci_host *ihost;
__le64 sas_addr;
ihost = idev->owning_port->owning_controller;
rnc = sci_rnc_by_id(ihost, rni);
memset(rnc, 0, sizeof(union scu_remote_node_context)
* sci_remote_device_node_count(idev));
rnc->ssp.remote_node_index = rni;
rnc->ssp.remote_node_port_width = idev->device_port_width;
rnc->ssp.logical_port_index = idev->owning_port->physical_port_index;
/* sas address is __be64, context ram format is __le64 */
sas_addr = cpu_to_le64(SAS_ADDR(dev->sas_addr));
rnc->ssp.remote_sas_address_hi = upper_32_bits(sas_addr);
rnc->ssp.remote_sas_address_lo = lower_32_bits(sas_addr);
rnc->ssp.nexus_loss_timer_enable = true;
rnc->ssp.check_bit = false;
rnc->ssp.is_valid = false;
rnc->ssp.is_remote_node_context = true;
rnc->ssp.function_number = 0;
rnc->ssp.arbitration_wait_time = 0;
if (dev_is_sata(dev)) {
rnc->ssp.connection_occupancy_timeout =
ihost->user_parameters.stp_max_occupancy_timeout;
rnc->ssp.connection_inactivity_timeout =
ihost->user_parameters.stp_inactivity_timeout;
} else {
rnc->ssp.connection_occupancy_timeout =
ihost->user_parameters.ssp_max_occupancy_timeout;
rnc->ssp.connection_inactivity_timeout =
ihost->user_parameters.ssp_inactivity_timeout;
}
rnc->ssp.initial_arbitration_wait_time = 0;
/* Open Address Frame Parameters */
rnc->ssp.oaf_connection_rate = idev->connection_rate;
rnc->ssp.oaf_features = 0;
rnc->ssp.oaf_source_zone_group = 0;
rnc->ssp.oaf_more_compatibility_features = 0;
}
/**
*
* @sci_rnc:
* @callback:
* @callback_parameter:
*
* This method will setup the remote node context object so it will transition
* to its ready state. If the remote node context is already setup to
* transition to its final state then this function does nothing. none
*/
static void sci_remote_node_context_setup_to_resume(
struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback callback,
void *callback_parameter,
enum sci_remote_node_context_destination_state dest_param)
{
if (sci_rnc->destination_state != RNC_DEST_FINAL) {
sci_rnc->destination_state = dest_param;
if (callback != NULL) {
sci_rnc->user_callback = callback;
sci_rnc->user_cookie = callback_parameter;
}
}
}
static void sci_remote_node_context_setup_to_destroy(
struct sci_remote_node_context *sci_rnc,
scics_sds_remote_node_context_callback callback,
void *callback_parameter)
{
struct isci_host *ihost = idev_to_ihost(rnc_to_dev(sci_rnc));
sci_rnc->destination_state = RNC_DEST_FINAL;
sci_rnc->user_callback = callback;
sci_rnc->user_cookie = callback_parameter;
wake_up(&ihost->eventq);
}
/**
*
*
* This method just calls the user callback function and then resets the
* callback.
*/
static void sci_remote_node_context_notify_user(
struct sci_remote_node_context *rnc)
{
if (rnc->user_callback != NULL) {
(*rnc->user_callback)(rnc->user_cookie);
rnc->user_callback = NULL;
rnc->user_cookie = NULL;
}
}
static void sci_remote_node_context_continue_state_transitions(struct sci_remote_node_context *rnc)
{
switch (rnc->destination_state) {
case RNC_DEST_READY:
case RNC_DEST_SUSPENDED_RESUME:
rnc->destination_state = RNC_DEST_READY;
/* Fall through... */
case RNC_DEST_FINAL:
sci_remote_node_context_resume(rnc, rnc->user_callback,
rnc->user_cookie);
break;
default:
rnc->destination_state = RNC_DEST_UNSPECIFIED;
break;
}
}
static void sci_remote_node_context_validate_context_buffer(struct sci_remote_node_context *sci_rnc)
{
union scu_remote_node_context *rnc_buffer;
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
struct domain_device *dev = idev->domain_dev;
struct isci_host *ihost = idev->owning_port->owning_controller;
rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
rnc_buffer->ssp.is_valid = true;
if (dev_is_sata(dev) && dev->parent) {
sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_96);
} else {
sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_32);
if (!dev->parent)
sci_port_setup_transports(idev->owning_port,
sci_rnc->remote_node_index);
}
}
static void sci_remote_node_context_invalidate_context_buffer(struct sci_remote_node_context *sci_rnc)
{
union scu_remote_node_context *rnc_buffer;
struct isci_remote_device *idev = rnc_to_dev(sci_rnc);
struct isci_host *ihost = idev->owning_port->owning_controller;
rnc_buffer = sci_rnc_by_id(ihost, sci_rnc->remote_node_index);
rnc_buffer->ssp.is_valid = false;
sci_remote_device_post_request(rnc_to_dev(sci_rnc),
SCU_CONTEXT_COMMAND_POST_RNC_INVALIDATE);
}
static void sci_remote_node_context_initial_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
struct isci_remote_device *idev = rnc_to_dev(rnc);
struct isci_host *ihost = idev->owning_port->owning_controller;
/* 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 == SCI_RNC_INVALIDATING) {
rnc->destination_state = RNC_DEST_UNSPECIFIED;
sci_remote_node_context_notify_user(rnc);
smp_wmb();
wake_up(&ihost->eventq);
}
}
static void sci_remote_node_context_posting_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *sci_rnc = container_of(sm, typeof(*sci_rnc), sm);
sci_remote_node_context_validate_context_buffer(sci_rnc);
}
static void sci_remote_node_context_invalidating_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
/* Terminate all outstanding requests. */
sci_remote_device_terminate_requests(rnc_to_dev(rnc));
sci_remote_node_context_invalidate_context_buffer(rnc);
}
static void sci_remote_node_context_resuming_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
struct isci_remote_device *idev;
struct domain_device *dev;
idev = rnc_to_dev(rnc);
dev = idev->domain_dev;
/*
* For direct attached SATA devices we need to clear the TLCR
* NCQ to TCi tag mapping on the phy and in cases where we
* resume because of a target reset we also need to update
* the STPTLDARNI register with the RNi of the device
*/
if (dev_is_sata(dev) && !dev->parent)
sci_port_setup_transports(idev->owning_port, rnc->remote_node_index);
sci_remote_device_post_request(idev, SCU_CONTEXT_COMMAND_POST_RNC_RESUME);
}
static void sci_remote_node_context_ready_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
enum sci_remote_node_context_destination_state dest_select;
int tell_user = 1;
dest_select = rnc->destination_state;
rnc->destination_state = RNC_DEST_UNSPECIFIED;
if ((dest_select == RNC_DEST_SUSPENDED) ||
(dest_select == RNC_DEST_SUSPENDED_RESUME)) {
sci_remote_node_context_suspend(
rnc, rnc->suspend_reason,
SCI_SOFTWARE_SUSPEND_EXPECTED_EVENT);
if (dest_select == RNC_DEST_SUSPENDED_RESUME)
tell_user = 0; /* Wait until ready again. */
}
if (tell_user)
sci_remote_node_context_notify_user(rnc);
}
static void sci_remote_node_context_tx_suspended_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
sci_remote_node_context_continue_state_transitions(rnc);
}
static void sci_remote_node_context_tx_rx_suspended_state_enter(struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc = container_of(sm, typeof(*rnc), sm);
struct isci_remote_device *idev = rnc_to_dev(rnc);
struct isci_host *ihost = idev->owning_port->owning_controller;
u32 new_count = rnc->suspend_count + 1;
if (new_count == 0)
rnc->suspend_count = 1;
else
rnc->suspend_count = new_count;
smp_wmb();
/* Terminate outstanding requests pending abort. */
sci_remote_device_abort_requests_pending_abort(idev);
wake_up(&ihost->eventq);
sci_remote_node_context_continue_state_transitions(rnc);
}
static void sci_remote_node_context_await_suspend_state_exit(
struct sci_base_state_machine *sm)
{
struct sci_remote_node_context *rnc
= container_of(sm, typeof(*rnc), sm);
struct isci_remote_device *idev = rnc_to_dev(rnc);
if (dev_is_sata(idev->domain_dev))
isci_dev_set_hang_detection_timeout(idev, 0);
}
static const struct sci_base_state sci_remote_node_context_state_table[] = {
[SCI_RNC_INITIAL] = {
.enter_state = sci_remote_node_context_initial_state_enter,
},
[SCI_RNC_POSTING] = {
.enter_state = sci_remote_node_context_posting_state_enter,
},
[SCI_RNC_INVALIDATING] = {
.enter_state = sci_remote_node_context_invalidating_state_enter,
},
[SCI_RNC_RESUMING] = {
.enter_state = sci_remote_node_context_resuming_state_enter,
},
[SCI_RNC_READY] = {
.enter_state = sci_remote_node_context_ready_state_enter,
},
[SCI_RNC_TX_SUSPENDED] = {
.enter_state = sci_remote_node_context_tx_suspended_state_enter,
},
[SCI_RNC_TX_RX_SUSPENDED] = {
.enter_state = sci_remote_node_context_tx_rx_suspended_state_enter,
},
[SCI_RNC_AWAIT_SUSPENSION] = {
.exit_state = sci_remote_node_context_await_suspend_state_exit,
},
};
void sci_remote_node_context_construct(struct sci_remote_node_context *rnc,
u16 remote_node_index)
{
memset(rnc, 0, sizeof(struct sci_remote_node_context));
rnc->remote_node_index = remote_node_index;
rnc->destination_state = RNC_DEST_UNSPECIFIED;
sci_init_sm(&rnc->sm, sci_remote_node_context_state_table, SCI_RNC_INITIAL);
}
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;
u32 next_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 == RNC_DEST_FINAL)
next_state = SCI_RNC_INITIAL;
else
next_state = SCI_RNC_POSTING;
sci_change_state(&sci_rnc->sm, next_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_warn(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_warn(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->suspend_type = scu_get_event_type(event_code);
break;
case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
sci_change_state(&sci_rnc->sm, SCI_RNC_TX_RX_SUSPENDED);
sci_rnc->suspend_type = scu_get_event_type(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:
next_state = SCI_RNC_TX_SUSPENDED;
break;
case SCU_EVENT_TL_RNC_SUSPEND_TX_RX:
next_state = SCI_RNC_TX_RX_SUSPENDED;
break;
default:
goto out;
}
if (sci_rnc->suspend_type == scu_get_event_type(event_code))
sci_change_state(&sci_rnc->sm, next_state);
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;
}
return SCI_SUCCESS;
out:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: code: %#x state: %s\n", __func__, event_code,
rnc_state_name(state));
return SCI_FAILURE;
}
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_destroy(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:
sci_remote_node_context_setup_to_destroy(sci_rnc, cb_fn, cb_p);
sci_change_state(&sci_rnc->sm, SCI_RNC_INVALIDATING);
return SCI_SUCCESS;
case SCI_RNC_AWAIT_SUSPENSION:
sci_remote_node_context_setup_to_destroy(sci_rnc, cb_fn, cb_p);
return SCI_SUCCESS;
case SCI_RNC_INITIAL:
dev_warn(scirdev_to_dev(rnc_to_dev(sci_rnc)),
"%s: invalid state: %s\n", __func__,
rnc_state_name(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 %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;
}
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_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 %s\n", __func__,
rnc_state_name(state));
return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
default:
dev_dbg(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_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;
}
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;
}
}