--- /dev/null
+/*
+ * 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;
+ }
+}
Code Review / kvmfornfv.git / blobdiff