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path: root/drivers/scsi/isci/remote_device.c
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-rw-r--r--drivers/scsi/isci/remote_device.c1501
1 files changed, 1501 insertions, 0 deletions
diff --git a/drivers/scsi/isci/remote_device.c b/drivers/scsi/isci/remote_device.c
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index 000000000000..b6e6368c2665
--- /dev/null
+++ b/drivers/scsi/isci/remote_device.c
@@ -0,0 +1,1501 @@
+/*
+ * 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.h>
+#include "isci.h"
+#include "port.h"
+#include "remote_device.h"
+#include "request.h"
+#include "remote_node_context.h"
+#include "scu_event_codes.h"
+#include "task.h"
+
+/**
+ * isci_remote_device_not_ready() - This function is called by the ihost when
+ * the remote device is not ready. We mark the isci device as ready (not
+ * "ready_for_io") and signal the waiting proccess.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device
+ *
+ * sci_lock is held on entrance to this function.
+ */
+static void isci_remote_device_not_ready(struct isci_host *ihost,
+ struct isci_remote_device *idev, u32 reason)
+{
+ struct isci_request *ireq;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: isci_device = %p\n", __func__, idev);
+
+ switch (reason) {
+ case SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED:
+ set_bit(IDEV_GONE, &idev->flags);
+ break;
+ case SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED:
+ set_bit(IDEV_IO_NCQERROR, &idev->flags);
+
+ /* Kill all outstanding requests for the device. */
+ list_for_each_entry(ireq, &idev->reqs_in_process, dev_node) {
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: isci_device = %p request = %p\n",
+ __func__, idev, ireq);
+
+ sci_controller_terminate_request(ihost,
+ idev,
+ ireq);
+ }
+ /* Fall through into the default case... */
+ default:
+ clear_bit(IDEV_IO_READY, &idev->flags);
+ break;
+ }
+}
+
+/**
+ * isci_remote_device_ready() - This function is called by the ihost when the
+ * remote device is ready. We mark the isci device as ready and signal the
+ * waiting proccess.
+ * @ihost: our valid isci_host
+ * @idev: remote device
+ *
+ */
+static void isci_remote_device_ready(struct isci_host *ihost, struct isci_remote_device *idev)
+{
+ dev_dbg(&ihost->pdev->dev,
+ "%s: idev = %p\n", __func__, idev);
+
+ clear_bit(IDEV_IO_NCQERROR, &idev->flags);
+ set_bit(IDEV_IO_READY, &idev->flags);
+ if (test_and_clear_bit(IDEV_START_PENDING, &idev->flags))
+ 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 isci_remote_device *idev = _dev;
+
+ BUG_ON(idev->started_request_count != 0);
+ sci_change_state(&idev->sm, SCI_DEV_STOPPED);
+}
+
+static enum sci_status sci_remote_device_terminate_requests(struct isci_remote_device *idev)
+{
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+ enum sci_status status = SCI_SUCCESS;
+ u32 i;
+
+ for (i = 0; i < SCI_MAX_IO_REQUESTS; i++) {
+ struct isci_request *ireq = ihost->reqs[i];
+ enum sci_status s;
+
+ if (!test_bit(IREQ_ACTIVE, &ireq->flags) ||
+ ireq->target_device != idev)
+ continue;
+
+ s = sci_controller_terminate_request(ihost, idev, ireq);
+ if (s != SCI_SUCCESS)
+ status = s;
+ }
+
+ return status;
+}
+
+enum sci_status sci_remote_device_stop(struct isci_remote_device *idev,
+ u32 timeout)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_DEV_STOPPED:
+ return SCI_SUCCESS;
+ case SCI_DEV_STARTING:
+ /* device not started so there had better be no requests */
+ BUG_ON(idev->started_request_count != 0);
+ sci_remote_node_context_destruct(&idev->rnc,
+ rnc_destruct_done, idev);
+ /* Transition to the stopping state and wait for the
+ * remote node to complete being posted and invalidated.
+ */
+ sci_change_state(sm, SCI_DEV_STOPPING);
+ return SCI_SUCCESS;
+ case SCI_DEV_READY:
+ case SCI_STP_DEV_IDLE:
+ case SCI_STP_DEV_CMD:
+ case SCI_STP_DEV_NCQ:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_STP_DEV_AWAIT_RESET:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_SMP_DEV_CMD:
+ sci_change_state(sm, SCI_DEV_STOPPING);
+ if (idev->started_request_count == 0) {
+ sci_remote_node_context_destruct(&idev->rnc,
+ rnc_destruct_done, idev);
+ return SCI_SUCCESS;
+ } else
+ return sci_remote_device_terminate_requests(idev);
+ break;
+ case SCI_DEV_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 sci_remote_device_terminate_requests(idev);
+ case SCI_DEV_RESETTING:
+ sci_change_state(sm, SCI_DEV_STOPPING);
+ return SCI_SUCCESS;
+ }
+}
+
+enum sci_status sci_remote_device_reset(struct isci_remote_device *idev)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_STOPPED:
+ case SCI_DEV_STARTING:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_SMP_DEV_CMD:
+ case SCI_DEV_STOPPING:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_RESETTING:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_DEV_READY:
+ case SCI_STP_DEV_IDLE:
+ case SCI_STP_DEV_CMD:
+ case SCI_STP_DEV_NCQ:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_STP_DEV_AWAIT_RESET:
+ sci_change_state(sm, SCI_DEV_RESETTING);
+ return SCI_SUCCESS;
+ }
+}
+
+enum sci_status sci_remote_device_reset_complete(struct isci_remote_device *idev)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+
+ if (state != SCI_DEV_RESETTING) {
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+
+ sci_change_state(sm, SCI_DEV_READY);
+ return SCI_SUCCESS;
+}
+
+enum sci_status sci_remote_device_suspend(struct isci_remote_device *idev,
+ u32 suspend_type)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+
+ if (state != SCI_STP_DEV_CMD) {
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+
+ return sci_remote_node_context_suspend(&idev->rnc,
+ suspend_type, NULL, NULL);
+}
+
+enum sci_status sci_remote_device_frame_handler(struct isci_remote_device *idev,
+ u32 frame_index)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+ enum sci_status status;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_STOPPED:
+ case SCI_DEV_STARTING:
+ case SCI_STP_DEV_IDLE:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ /* Return the frame back to the controller */
+ sci_controller_release_frame(ihost, frame_index);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_DEV_READY:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_STP_DEV_AWAIT_RESET:
+ case SCI_DEV_STOPPING:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_RESETTING: {
+ struct isci_request *ireq;
+ struct ssp_frame_hdr hdr;
+ void *frame_header;
+ ssize_t word_cnt;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ &frame_header);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ word_cnt = sizeof(hdr) / sizeof(u32);
+ sci_swab32_cpy(&hdr, frame_header, word_cnt);
+
+ ireq = sci_request_by_tag(ihost, be16_to_cpu(hdr.tag));
+ if (ireq && ireq->target_device == idev) {
+ /* The IO request is now in charge of releasing the frame */
+ status = sci_io_request_frame_handler(ireq, frame_index);
+ } else {
+ /* We could not map this tag to a valid IO
+ * request Just toss the frame and continue
+ */
+ sci_controller_release_frame(ihost, frame_index);
+ }
+ break;
+ }
+ case SCI_STP_DEV_NCQ: {
+ struct dev_to_host_fis *hdr;
+
+ status = sci_unsolicited_frame_control_get_header(&ihost->uf_control,
+ frame_index,
+ (void **)&hdr);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ if (hdr->fis_type == FIS_SETDEVBITS &&
+ (hdr->status & ATA_ERR)) {
+ idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
+
+ /* TODO Check sactive and complete associated IO if any. */
+ sci_change_state(sm, SCI_STP_DEV_NCQ_ERROR);
+ } else if (hdr->fis_type == FIS_REGD2H &&
+ (hdr->status & ATA_ERR)) {
+ /*
+ * Some devices return D2H FIS when an NCQ error is detected.
+ * Treat this like an SDB error FIS ready reason.
+ */
+ idev->not_ready_reason = SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED;
+ sci_change_state(&idev->sm, SCI_STP_DEV_NCQ_ERROR);
+ } else
+ status = SCI_FAILURE;
+
+ sci_controller_release_frame(ihost, frame_index);
+ break;
+ }
+ case SCI_STP_DEV_CMD:
+ case SCI_SMP_DEV_CMD:
+ /* The device does not process any UF received from the hardware while
+ * in this state. All unsolicited frames are forwarded to the io request
+ * object.
+ */
+ status = sci_io_request_frame_handler(idev->working_request, frame_index);
+ break;
+ }
+
+ return status;
+}
+
+static bool is_remote_device_ready(struct isci_remote_device *idev)
+{
+
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+
+ switch (state) {
+ case SCI_DEV_READY:
+ case SCI_STP_DEV_IDLE:
+ case SCI_STP_DEV_CMD:
+ case SCI_STP_DEV_NCQ:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_STP_DEV_AWAIT_RESET:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_SMP_DEV_CMD:
+ return true;
+ default:
+ return false;
+ }
+}
+
+enum sci_status sci_remote_device_event_handler(struct isci_remote_device *idev,
+ u32 event_code)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ enum sci_status status;
+
+ switch (scu_get_event_type(event_code)) {
+ case SCU_EVENT_TYPE_RNC_OPS_MISC:
+ case SCU_EVENT_TYPE_RNC_SUSPEND_TX:
+ case SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX:
+ status = sci_remote_node_context_event_handler(&idev->rnc, event_code);
+ break;
+ case SCU_EVENT_TYPE_PTX_SCHEDULE_EVENT:
+ if (scu_get_event_code(event_code) == SCU_EVENT_IT_NEXUS_TIMEOUT) {
+ status = SCI_SUCCESS;
+
+ /* Suspend the associated RNC */
+ sci_remote_node_context_suspend(&idev->rnc,
+ SCI_SOFTWARE_SUSPENSION,
+ NULL, NULL);
+
+ dev_dbg(scirdev_to_dev(idev),
+ "%s: device: %p event code: %x: %s\n",
+ __func__, idev, event_code,
+ is_remote_device_ready(idev)
+ ? "I_T_Nexus_Timeout event"
+ : "I_T_Nexus_Timeout event in wrong state");
+
+ break;
+ }
+ /* Else, fall through and treat as unhandled... */
+ default:
+ dev_dbg(scirdev_to_dev(idev),
+ "%s: device: %p event code: %x: %s\n",
+ __func__, idev, event_code,
+ is_remote_device_ready(idev)
+ ? "unexpected event"
+ : "unexpected event in wrong state");
+ status = SCI_FAILURE_INVALID_STATE;
+ break;
+ }
+
+ if (status != SCI_SUCCESS)
+ return status;
+
+ if (state == SCI_STP_DEV_IDLE) {
+
+ /* We pick up suspension events to handle specifically to this
+ * state. We resume the RNC right away.
+ */
+ if (scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX ||
+ scu_get_event_type(event_code) == SCU_EVENT_TYPE_RNC_SUSPEND_TX_RX)
+ status = sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
+ }
+
+ return status;
+}
+
+static void sci_remote_device_start_request(struct isci_remote_device *idev,
+ struct isci_request *ireq,
+ enum sci_status status)
+{
+ struct isci_port *iport = idev->owning_port;
+
+ /* cleanup requests that failed after starting on the port */
+ if (status != SCI_SUCCESS)
+ sci_port_complete_io(iport, idev, ireq);
+ else {
+ kref_get(&idev->kref);
+ idev->started_request_count++;
+ }
+}
+
+enum sci_status sci_remote_device_start_io(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ struct isci_port *iport = idev->owning_port;
+ enum sci_status status;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_STOPPED:
+ case SCI_DEV_STARTING:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_DEV_STOPPING:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_RESETTING:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_DEV_READY:
+ /* attempt to start an io request for this device object. The remote
+ * device object will issue the start request for the io and if
+ * successful it will start the request for the port object then
+ * increment its own request count.
+ */
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_io(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ status = sci_request_start(ireq);
+ break;
+ case SCI_STP_DEV_IDLE: {
+ /* handle the start io operation for a sata device that is in
+ * the command idle state. - Evalute the type of IO request to
+ * be started - If its an NCQ request change to NCQ substate -
+ * If its any other command change to the CMD substate
+ *
+ * If this is a softreset we may want to have a different
+ * substate.
+ */
+ enum sci_remote_device_states new_state;
+ struct sas_task *task = isci_request_access_task(ireq);
+
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_io(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ status = sci_request_start(ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ if (task->ata_task.use_ncq)
+ new_state = SCI_STP_DEV_NCQ;
+ else {
+ idev->working_request = ireq;
+ new_state = SCI_STP_DEV_CMD;
+ }
+ sci_change_state(sm, new_state);
+ break;
+ }
+ case SCI_STP_DEV_NCQ: {
+ struct sas_task *task = isci_request_access_task(ireq);
+
+ if (task->ata_task.use_ncq) {
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_io(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ status = sci_request_start(ireq);
+ } else
+ return SCI_FAILURE_INVALID_STATE;
+ break;
+ }
+ case SCI_STP_DEV_AWAIT_RESET:
+ return SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED;
+ case SCI_SMP_DEV_IDLE:
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_io(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ status = sci_request_start(ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ idev->working_request = ireq;
+ sci_change_state(&idev->sm, SCI_SMP_DEV_CMD);
+ break;
+ case SCI_STP_DEV_CMD:
+ case SCI_SMP_DEV_CMD:
+ /* device is already handling a command it can not accept new commands
+ * until this one is complete.
+ */
+ return SCI_FAILURE_INVALID_STATE;
+ }
+
+ sci_remote_device_start_request(idev, ireq, status);
+ return status;
+}
+
+static enum sci_status common_complete_io(struct isci_port *iport,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ enum sci_status status;
+
+ status = sci_request_complete(ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_port_complete_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ sci_remote_device_decrement_request_count(idev);
+ return status;
+}
+
+enum sci_status sci_remote_device_complete_io(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ struct isci_port *iport = idev->owning_port;
+ enum sci_status status;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_STOPPED:
+ case SCI_DEV_STARTING:
+ case SCI_STP_DEV_IDLE:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_DEV_READY:
+ case SCI_STP_DEV_AWAIT_RESET:
+ case SCI_DEV_RESETTING:
+ status = common_complete_io(iport, idev, ireq);
+ break;
+ case SCI_STP_DEV_CMD:
+ case SCI_STP_DEV_NCQ:
+ case SCI_STP_DEV_NCQ_ERROR:
+ status = common_complete_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ if (ireq->sci_status == SCI_FAILURE_REMOTE_DEVICE_RESET_REQUIRED) {
+ /* This request causes hardware error, device needs to be Lun Reset.
+ * So here we force the state machine to IDLE state so the rest IOs
+ * can reach RNC state handler, these IOs will be completed by RNC with
+ * status of "DEVICE_RESET_REQUIRED", instead of "INVALID STATE".
+ */
+ sci_change_state(sm, SCI_STP_DEV_AWAIT_RESET);
+ } else if (idev->started_request_count == 0)
+ sci_change_state(sm, SCI_STP_DEV_IDLE);
+ break;
+ case SCI_SMP_DEV_CMD:
+ status = common_complete_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+ sci_change_state(sm, SCI_SMP_DEV_IDLE);
+ break;
+ case SCI_DEV_STOPPING:
+ status = common_complete_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ if (idev->started_request_count == 0)
+ sci_remote_node_context_destruct(&idev->rnc,
+ rnc_destruct_done,
+ idev);
+ break;
+ }
+
+ if (status != SCI_SUCCESS)
+ dev_err(scirdev_to_dev(idev),
+ "%s: Port:0x%p Device:0x%p Request:0x%p Status:0x%x "
+ "could not complete\n", __func__, iport,
+ idev, ireq, status);
+ else
+ isci_put_device(idev);
+
+ return status;
+}
+
+static void sci_remote_device_continue_request(void *dev)
+{
+ struct isci_remote_device *idev = dev;
+
+ /* we need to check if this request is still valid to continue. */
+ if (idev->working_request)
+ sci_controller_continue_io(idev->working_request);
+}
+
+enum sci_status sci_remote_device_start_task(struct isci_host *ihost,
+ struct isci_remote_device *idev,
+ struct isci_request *ireq)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ struct isci_port *iport = idev->owning_port;
+ enum sci_status status;
+
+ switch (state) {
+ case SCI_DEV_INITIAL:
+ case SCI_DEV_STOPPED:
+ case SCI_DEV_STARTING:
+ case SCI_SMP_DEV_IDLE:
+ case SCI_SMP_DEV_CMD:
+ case SCI_DEV_STOPPING:
+ case SCI_DEV_FAILED:
+ case SCI_DEV_RESETTING:
+ case SCI_DEV_FINAL:
+ default:
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ case SCI_STP_DEV_IDLE:
+ case SCI_STP_DEV_CMD:
+ case SCI_STP_DEV_NCQ:
+ case SCI_STP_DEV_NCQ_ERROR:
+ case SCI_STP_DEV_AWAIT_RESET:
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_task(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ goto out;
+
+ status = sci_request_start(ireq);
+ if (status != SCI_SUCCESS)
+ goto out;
+
+ /* Note: If the remote device state is not IDLE this will
+ * replace the request that probably resulted in the task
+ * management request.
+ */
+ idev->working_request = ireq;
+ sci_change_state(sm, SCI_STP_DEV_CMD);
+
+ /* The remote node context must cleanup the TCi to NCQ mapping
+ * table. The only way to do this correctly is to either write
+ * to the TLCR register or to invalidate and repost the RNC. In
+ * either case the remote node context state machine will take
+ * the correct action when the remote node context is suspended
+ * and later resumed.
+ */
+ sci_remote_node_context_suspend(&idev->rnc,
+ SCI_SOFTWARE_SUSPENSION, NULL, NULL);
+ sci_remote_node_context_resume(&idev->rnc,
+ sci_remote_device_continue_request,
+ idev);
+
+ out:
+ sci_remote_device_start_request(idev, ireq, status);
+ /* We need to let the controller start request handler know that
+ * it can't post TC yet. We will provide a callback function to
+ * post TC when RNC gets resumed.
+ */
+ return SCI_FAILURE_RESET_DEVICE_PARTIAL_SUCCESS;
+ case SCI_DEV_READY:
+ status = sci_port_start_io(iport, idev, ireq);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ status = sci_remote_node_context_start_task(&idev->rnc, ireq);
+ if (status != SCI_SUCCESS)
+ break;
+
+ status = sci_request_start(ireq);
+ break;
+ }
+ sci_remote_device_start_request(idev, ireq, status);
+
+ return status;
+}
+
+void sci_remote_device_post_request(struct isci_remote_device *idev, u32 request)
+{
+ struct isci_port *iport = idev->owning_port;
+ u32 context;
+
+ context = request |
+ (ISCI_PEG << SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
+ (iport->physical_port_index << SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
+ idev->rnc.remote_node_index;
+
+ sci_controller_post_request(iport->owning_controller, context);
+}
+
+/* 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.
+ */
+static void remote_device_resume_done(void *_dev)
+{
+ struct isci_remote_device *idev = _dev;
+
+ if (is_remote_device_ready(idev))
+ return;
+
+ /* go 'ready' if we are not already in a ready state */
+ sci_change_state(&idev->sm, SCI_DEV_READY);
+}
+
+static void sci_stp_remote_device_ready_idle_substate_resume_complete_handler(void *_dev)
+{
+ struct isci_remote_device *idev = _dev;
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ /* For NCQ operation we do not issue a isci_remote_device_not_ready().
+ * As a result, avoid sending the ready notification.
+ */
+ if (idev->sm.previous_state_id != SCI_STP_DEV_NCQ)
+ isci_remote_device_ready(ihost, idev);
+}
+
+static void sci_remote_device_initial_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+
+ /* Initial state is a transitional state to the stopped state */
+ sci_change_state(&idev->sm, SCI_DEV_STOPPED);
+}
+
+/**
+ * sci_remote_device_destruct() - free remote node context and destruct
+ * @remote_device: This parameter specifies the remote device to be destructed.
+ *
+ * Remote device objects are a limited resource. As such, they must be
+ * protected. Thus calls to construct and destruct are mutually exclusive and
+ * non-reentrant. The return value shall indicate if the device was
+ * successfully destructed or if some failure occurred. enum sci_status This value
+ * is returned if the device is successfully destructed.
+ * SCI_FAILURE_INVALID_REMOTE_DEVICE This value is returned if the supplied
+ * device isn't valid (e.g. it's already been destoryed, the handle isn't
+ * valid, etc.).
+ */
+static enum sci_status sci_remote_device_destruct(struct isci_remote_device *idev)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ struct isci_host *ihost;
+
+ if (state != SCI_DEV_STOPPED) {
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+
+ ihost = idev->owning_port->owning_controller;
+ sci_controller_free_remote_node_context(ihost, idev,
+ idev->rnc.remote_node_index);
+ idev->rnc.remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
+ sci_change_state(sm, SCI_DEV_FINAL);
+
+ return SCI_SUCCESS;
+}
+
+/**
+ * isci_remote_device_deconstruct() - This function frees an isci_remote_device.
+ * @ihost: This parameter specifies the isci host object.
+ * @idev: This parameter specifies the remote device to be freed.
+ *
+ */
+static void isci_remote_device_deconstruct(struct isci_host *ihost, struct isci_remote_device *idev)
+{
+ dev_dbg(&ihost->pdev->dev,
+ "%s: isci_device = %p\n", __func__, idev);
+
+ /* There should not be any outstanding io's. All paths to
+ * here should go through isci_remote_device_nuke_requests.
+ * If we hit this condition, we will need a way to complete
+ * io requests in process */
+ BUG_ON(!list_empty(&idev->reqs_in_process));
+
+ sci_remote_device_destruct(idev);
+ list_del_init(&idev->node);
+ isci_put_device(idev);
+}
+
+static void sci_remote_device_stopped_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+ u32 prev_state;
+
+ /* If we are entering from the stopping state let the SCI User know that
+ * the stop operation has completed.
+ */
+ prev_state = idev->sm.previous_state_id;
+ if (prev_state == SCI_DEV_STOPPING)
+ isci_remote_device_deconstruct(ihost, idev);
+
+ sci_controller_remote_device_stopped(ihost, idev);
+}
+
+static void sci_remote_device_starting_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ isci_remote_device_not_ready(ihost, idev,
+ SCIC_REMOTE_DEVICE_NOT_READY_START_REQUESTED);
+}
+
+static void sci_remote_device_ready_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+ struct domain_device *dev = idev->domain_dev;
+
+ if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_SATA)) {
+ sci_change_state(&idev->sm, SCI_STP_DEV_IDLE);
+ } else if (dev_is_expander(dev)) {
+ sci_change_state(&idev->sm, SCI_SMP_DEV_IDLE);
+ } else
+ isci_remote_device_ready(ihost, idev);
+}
+
+static void sci_remote_device_ready_state_exit(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct domain_device *dev = idev->domain_dev;
+
+ if (dev->dev_type == SAS_END_DEV) {
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ isci_remote_device_not_ready(ihost, idev,
+ SCIC_REMOTE_DEVICE_NOT_READY_STOP_REQUESTED);
+ }
+}
+
+static void sci_remote_device_resetting_state_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+
+ sci_remote_node_context_suspend(
+ &idev->rnc, SCI_SOFTWARE_SUSPENSION, NULL, NULL);
+}
+
+static void sci_remote_device_resetting_state_exit(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+
+ sci_remote_node_context_resume(&idev->rnc, NULL, NULL);
+}
+
+static void sci_stp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+
+ idev->working_request = NULL;
+ if (sci_remote_node_context_is_ready(&idev->rnc)) {
+ /*
+ * Since the RNC is ready, it's alright to finish completion
+ * processing (e.g. signal the remote device is ready). */
+ sci_stp_remote_device_ready_idle_substate_resume_complete_handler(idev);
+ } else {
+ sci_remote_node_context_resume(&idev->rnc,
+ sci_stp_remote_device_ready_idle_substate_resume_complete_handler,
+ idev);
+ }
+}
+
+static void sci_stp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ BUG_ON(idev->working_request == NULL);
+
+ isci_remote_device_not_ready(ihost, idev,
+ SCIC_REMOTE_DEVICE_NOT_READY_SATA_REQUEST_STARTED);
+}
+
+static void sci_stp_remote_device_ready_ncq_error_substate_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ if (idev->not_ready_reason == SCIC_REMOTE_DEVICE_NOT_READY_SATA_SDB_ERROR_FIS_RECEIVED)
+ isci_remote_device_not_ready(ihost, idev,
+ idev->not_ready_reason);
+}
+
+static void sci_smp_remote_device_ready_idle_substate_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ isci_remote_device_ready(ihost, idev);
+}
+
+static void sci_smp_remote_device_ready_cmd_substate_enter(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+ struct isci_host *ihost = idev->owning_port->owning_controller;
+
+ BUG_ON(idev->working_request == NULL);
+
+ isci_remote_device_not_ready(ihost, idev,
+ SCIC_REMOTE_DEVICE_NOT_READY_SMP_REQUEST_STARTED);
+}
+
+static void sci_smp_remote_device_ready_cmd_substate_exit(struct sci_base_state_machine *sm)
+{
+ struct isci_remote_device *idev = container_of(sm, typeof(*idev), sm);
+
+ idev->working_request = NULL;
+}
+
+static const struct sci_base_state sci_remote_device_state_table[] = {
+ [SCI_DEV_INITIAL] = {
+ .enter_state = sci_remote_device_initial_state_enter,
+ },
+ [SCI_DEV_STOPPED] = {
+ .enter_state = sci_remote_device_stopped_state_enter,
+ },
+ [SCI_DEV_STARTING] = {
+ .enter_state = sci_remote_device_starting_state_enter,
+ },
+ [SCI_DEV_READY] = {
+ .enter_state = sci_remote_device_ready_state_enter,
+ .exit_state = sci_remote_device_ready_state_exit
+ },
+ [SCI_STP_DEV_IDLE] = {
+ .enter_state = sci_stp_remote_device_ready_idle_substate_enter,
+ },
+ [SCI_STP_DEV_CMD] = {
+ .enter_state = sci_stp_remote_device_ready_cmd_substate_enter,
+ },
+ [SCI_STP_DEV_NCQ] = { },
+ [SCI_STP_DEV_NCQ_ERROR] = {
+ .enter_state = sci_stp_remote_device_ready_ncq_error_substate_enter,
+ },
+ [SCI_STP_DEV_AWAIT_RESET] = { },
+ [SCI_SMP_DEV_IDLE] = {
+ .enter_state = sci_smp_remote_device_ready_idle_substate_enter,
+ },
+ [SCI_SMP_DEV_CMD] = {
+ .enter_state = sci_smp_remote_device_ready_cmd_substate_enter,
+ .exit_state = sci_smp_remote_device_ready_cmd_substate_exit,
+ },
+ [SCI_DEV_STOPPING] = { },
+ [SCI_DEV_FAILED] = { },
+ [SCI_DEV_RESETTING] = {
+ .enter_state = sci_remote_device_resetting_state_enter,
+ .exit_state = sci_remote_device_resetting_state_exit
+ },
+ [SCI_DEV_FINAL] = { },
+};
+
+/**
+ * sci_remote_device_construct() - common construction
+ * @sci_port: SAS/SATA port through which this device is accessed.
+ * @sci_dev: remote device to construct
+ *
+ * This routine just performs benign initialization and does not
+ * allocate the remote_node_context which is left to
+ * sci_remote_device_[de]a_construct(). sci_remote_device_destruct()
+ * frees the remote_node_context(s) for the device.
+ */
+static void sci_remote_device_construct(struct isci_port *iport,
+ struct isci_remote_device *idev)
+{
+ idev->owning_port = iport;
+ idev->started_request_count = 0;
+
+ sci_init_sm(&idev->sm, sci_remote_device_state_table, SCI_DEV_INITIAL);
+
+ sci_remote_node_context_construct(&idev->rnc,
+ SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX);
+}
+
+/**
+ * sci_remote_device_da_construct() - construct direct attached device.
+ *
+ * The information (e.g. IAF, Signature FIS, etc.) necessary to build
+ * the device is known to the SCI Core since it is contained in the
+ * sci_phy object. Remote node context(s) is/are a global resource
+ * allocated by this routine, freed by sci_remote_device_destruct().
+ *
+ * Returns:
+ * SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
+ * SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
+ * sata-only controller instance.
+ * SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
+ */
+static enum sci_status sci_remote_device_da_construct(struct isci_port *iport,
+ struct isci_remote_device *idev)
+{
+ enum sci_status status;
+ struct domain_device *dev = idev->domain_dev;
+
+ sci_remote_device_construct(iport, idev);
+
+ /*
+ * This information is request to determine how many remote node context
+ * entries will be needed to store the remote node.
+ */
+ idev->is_direct_attached = true;
+ status = sci_controller_allocate_remote_node_context(iport->owning_controller,
+ idev,
+ &idev->rnc.remote_node_index);
+
+ if (status != SCI_SUCCESS)
+ return status;
+
+ if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
+ (dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
+ /* pass */;
+ else
+ return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+
+ idev->connection_rate = sci_port_get_max_allowed_speed(iport);
+
+ /* / @todo Should I assign the port width by reading all of the phys on the port? */
+ idev->device_port_width = 1;
+
+ return SCI_SUCCESS;
+}
+
+/**
+ * sci_remote_device_ea_construct() - construct expander attached device
+ *
+ * Remote node context(s) is/are a global resource allocated by this
+ * routine, freed by sci_remote_device_destruct().
+ *
+ * Returns:
+ * SCI_FAILURE_DEVICE_EXISTS - device has already been constructed.
+ * SCI_FAILURE_UNSUPPORTED_PROTOCOL - e.g. sas device attached to
+ * sata-only controller instance.
+ * SCI_FAILURE_INSUFFICIENT_RESOURCES - remote node contexts exhausted.
+ */
+static enum sci_status sci_remote_device_ea_construct(struct isci_port *iport,
+ struct isci_remote_device *idev)
+{
+ struct domain_device *dev = idev->domain_dev;
+ enum sci_status status;
+
+ sci_remote_device_construct(iport, idev);
+
+ status = sci_controller_allocate_remote_node_context(iport->owning_controller,
+ idev,
+ &idev->rnc.remote_node_index);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ if (dev->dev_type == SAS_END_DEV || dev->dev_type == SATA_DEV ||
+ (dev->tproto & SAS_PROTOCOL_STP) || dev_is_expander(dev))
+ /* pass */;
+ else
+ return SCI_FAILURE_UNSUPPORTED_PROTOCOL;
+
+ /*
+ * For SAS-2 the physical link rate is actually a logical link
+ * rate that incorporates multiplexing. The SCU doesn't
+ * incorporate multiplexing and for the purposes of the
+ * connection the logical link rate is that same as the
+ * physical. Furthermore, the SAS-2 and SAS-1.1 fields overlay
+ * one another, so this code works for both situations. */
+ idev->connection_rate = min_t(u16, sci_port_get_max_allowed_speed(iport),
+ dev->linkrate);
+
+ /* / @todo Should I assign the port width by reading all of the phys on the port? */
+ idev->device_port_width = 1;
+
+ return SCI_SUCCESS;
+}
+
+/**
+ * sci_remote_device_start() - This method will start the supplied remote
+ * device. This method enables normal IO requests to flow through to the
+ * remote device.
+ * @remote_device: This parameter specifies the device to be started.
+ * @timeout: This parameter specifies the number of milliseconds in which the
+ * start operation should complete.
+ *
+ * An indication of whether the device was successfully started. SCI_SUCCESS
+ * This value is returned if the device was successfully started.
+ * SCI_FAILURE_INVALID_PHY This value is returned if the user attempts to start
+ * the device when there have been no phys added to it.
+ */
+static enum sci_status sci_remote_device_start(struct isci_remote_device *idev,
+ u32 timeout)
+{
+ struct sci_base_state_machine *sm = &idev->sm;
+ enum sci_remote_device_states state = sm->current_state_id;
+ enum sci_status status;
+
+ if (state != SCI_DEV_STOPPED) {
+ dev_warn(scirdev_to_dev(idev), "%s: in wrong state: %d\n",
+ __func__, state);
+ return SCI_FAILURE_INVALID_STATE;
+ }
+
+ status = sci_remote_node_context_resume(&idev->rnc,
+ remote_device_resume_done,
+ idev);
+ if (status != SCI_SUCCESS)
+ return status;
+
+ sci_change_state(sm, SCI_DEV_STARTING);
+
+ return SCI_SUCCESS;
+}
+
+static enum sci_status isci_remote_device_construct(struct isci_port *iport,
+ struct isci_remote_device *idev)
+{
+ struct isci_host *ihost = iport->isci_host;
+ struct domain_device *dev = idev->domain_dev;
+ enum sci_status status;
+
+ if (dev->parent && dev_is_expander(dev->parent))
+ status = sci_remote_device_ea_construct(iport, idev);
+ else
+ status = sci_remote_device_da_construct(iport, idev);
+
+ if (status != SCI_SUCCESS) {
+ dev_dbg(&ihost->pdev->dev, "%s: construct failed: %d\n",
+ __func__, status);
+
+ return status;
+ }
+
+ /* start the device. */
+ status = sci_remote_device_start(idev, ISCI_REMOTE_DEVICE_START_TIMEOUT);
+
+ if (status != SCI_SUCCESS)
+ dev_warn(&ihost->pdev->dev, "remote device start failed: %d\n",
+ status);
+
+ return status;
+}
+
+void isci_remote_device_nuke_requests(struct isci_host *ihost, struct isci_remote_device *idev)
+{
+ DECLARE_COMPLETION_ONSTACK(aborted_task_completion);
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: idev = %p\n", __func__, idev);
+
+ /* Cleanup all requests pending for this device. */
+ isci_terminate_pending_requests(ihost, idev);
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: idev = %p, done\n", __func__, idev);
+}
+
+/**
+ * This function builds the isci_remote_device when a libsas dev_found message
+ * is received.
+ * @isci_host: This parameter specifies the isci host object.
+ * @port: This parameter specifies the isci_port conected to this device.
+ *
+ * pointer to new isci_remote_device.
+ */
+static struct isci_remote_device *
+isci_remote_device_alloc(struct isci_host *ihost, struct isci_port *iport)
+{
+ struct isci_remote_device *idev;
+ int i;
+
+ for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
+ idev = &ihost->devices[i];
+ if (!test_and_set_bit(IDEV_ALLOCATED, &idev->flags))
+ break;
+ }
+
+ if (i >= SCI_MAX_REMOTE_DEVICES) {
+ dev_warn(&ihost->pdev->dev, "%s: failed\n", __func__);
+ return NULL;
+ }
+
+ if (WARN_ONCE(!list_empty(&idev->reqs_in_process), "found requests in process\n"))
+ return NULL;
+
+ if (WARN_ONCE(!list_empty(&idev->node), "found non-idle remote device\n"))
+ return NULL;
+
+ return idev;
+}
+
+void isci_remote_device_release(struct kref *kref)
+{
+ struct isci_remote_device *idev = container_of(kref, typeof(*idev), kref);
+ struct isci_host *ihost = idev->isci_port->isci_host;
+
+ idev->domain_dev = NULL;
+ idev->isci_port = NULL;
+ clear_bit(IDEV_START_PENDING, &idev->flags);
+ clear_bit(IDEV_STOP_PENDING, &idev->flags);
+ clear_bit(IDEV_IO_READY, &idev->flags);
+ clear_bit(IDEV_GONE, &idev->flags);
+ clear_bit(IDEV_EH, &idev->flags);
+ smp_mb__before_clear_bit();
+ clear_bit(IDEV_ALLOCATED, &idev->flags);
+ wake_up(&ihost->eventq);
+}
+
+/**
+ * isci_remote_device_stop() - This function is called internally to stop the
+ * remote device.
+ * @isci_host: This parameter specifies the isci host object.
+ * @isci_device: This parameter specifies the remote device.
+ *
+ * The status of the ihost request to stop.
+ */
+enum sci_status isci_remote_device_stop(struct isci_host *ihost, struct isci_remote_device *idev)
+{
+ enum sci_status status;
+ unsigned long flags;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: isci_device = %p\n", __func__, idev);
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ idev->domain_dev->lldd_dev = NULL; /* disable new lookups */
+ set_bit(IDEV_GONE, &idev->flags);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+ /* Kill all outstanding requests. */
+ isci_remote_device_nuke_requests(ihost, idev);
+
+ set_bit(IDEV_STOP_PENDING, &idev->flags);
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+ status = sci_remote_device_stop(idev, 50);
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+
+ /* Wait for the stop complete callback. */
+ if (WARN_ONCE(status != SCI_SUCCESS, "failed to stop device\n"))
+ /* nothing to wait for */;
+ else
+ wait_for_device_stop(ihost, idev);
+
+ return status;
+}
+
+/**
+ * isci_remote_device_gone() - This function is called by libsas when a domain
+ * device is removed.
+ * @domain_device: This parameter specifies the libsas domain device.
+ *
+ */
+void isci_remote_device_gone(struct domain_device *dev)
+{
+ struct isci_host *ihost = dev_to_ihost(dev);
+ struct isci_remote_device *idev = dev->lldd_dev;
+
+ dev_dbg(&ihost->pdev->dev,
+ "%s: domain_device = %p, isci_device = %p, isci_port = %p\n",
+ __func__, dev, idev, idev->isci_port);
+
+ isci_remote_device_stop(ihost, idev);
+}
+
+
+/**
+ * isci_remote_device_found() - This function is called by libsas when a remote
+ * device is discovered. A remote device object is created and started. the
+ * function then sleeps until the sci core device started message is
+ * received.
+ * @domain_device: This parameter specifies the libsas domain device.
+ *
+ * status, zero indicates success.
+ */
+int isci_remote_device_found(struct domain_device *domain_dev)
+{
+ struct isci_host *isci_host = dev_to_ihost(domain_dev);
+ struct isci_port *isci_port;
+ struct isci_phy *isci_phy;
+ struct asd_sas_port *sas_port;
+ struct asd_sas_phy *sas_phy;
+ struct isci_remote_device *isci_device;
+ enum sci_status status;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: domain_device = %p\n", __func__, domain_dev);
+
+ wait_for_start(isci_host);
+
+ sas_port = domain_dev->port;
+ sas_phy = list_first_entry(&sas_port->phy_list, struct asd_sas_phy,
+ port_phy_el);
+ isci_phy = to_iphy(sas_phy);
+ isci_port = isci_phy->isci_port;
+
+ /* we are being called for a device on this port,
+ * so it has to come up eventually
+ */
+ wait_for_completion(&isci_port->start_complete);
+
+ if ((isci_stopping == isci_port_get_state(isci_port)) ||
+ (isci_stopped == isci_port_get_state(isci_port)))
+ return -ENODEV;
+
+ isci_device = isci_remote_device_alloc(isci_host, isci_port);
+ if (!isci_device)
+ return -ENODEV;
+
+ kref_init(&isci_device->kref);
+ INIT_LIST_HEAD(&isci_device->node);
+
+ spin_lock_irq(&isci_host->scic_lock);
+ isci_device->domain_dev = domain_dev;
+ isci_device->isci_port = isci_port;
+ list_add_tail(&isci_device->node, &isci_port->remote_dev_list);
+
+ set_bit(IDEV_START_PENDING, &isci_device->flags);
+ status = isci_remote_device_construct(isci_port, isci_device);
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device = %p\n",
+ __func__, isci_device);
+
+ if (status == SCI_SUCCESS) {
+ /* device came up, advertise it to the world */
+ domain_dev->lldd_dev = isci_device;
+ } else
+ isci_put_device(isci_device);
+ spin_unlock_irq(&isci_host->scic_lock);
+
+ /* wait for the device ready callback. */
+ wait_for_device_start(isci_host, isci_device);
+
+ return status == SCI_SUCCESS ? 0 : -ENODEV;
+}
+/**
+ * isci_device_is_reset_pending() - This function will check if there is any
+ * pending reset condition on the device.
+ * @request: This parameter is the isci_device object.
+ *
+ * true if there is a reset pending for the device.
+ */
+bool isci_device_is_reset_pending(
+ struct isci_host *isci_host,
+ struct isci_remote_device *isci_device)
+{
+ struct isci_request *isci_request;
+ struct isci_request *tmp_req;
+ bool reset_is_pending = false;
+ unsigned long flags;
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device = %p\n", __func__, isci_device);
+
+ spin_lock_irqsave(&isci_host->scic_lock, flags);
+
+ /* Check for reset on all pending requests. */
+ list_for_each_entry_safe(isci_request, tmp_req,
+ &isci_device->reqs_in_process, dev_node) {
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device = %p request = %p\n",
+ __func__, isci_device, isci_request);
+
+ if (isci_request->ttype == io_task) {
+ struct sas_task *task = isci_request_access_task(
+ isci_request);
+
+ spin_lock(&task->task_state_lock);
+ if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
+ reset_is_pending = true;
+ spin_unlock(&task->task_state_lock);
+ }
+ }
+
+ spin_unlock_irqrestore(&isci_host->scic_lock, flags);
+
+ dev_dbg(&isci_host->pdev->dev,
+ "%s: isci_device = %p reset_is_pending = %d\n",
+ __func__, isci_device, reset_is_pending);
+
+ return reset_is_pending;
+}
+
+/**
+ * isci_device_clear_reset_pending() - This function will clear if any pending
+ * reset condition flags on the device.
+ * @request: This parameter is the isci_device object.
+ *
+ * true if there is a reset pending for the device.
+ */
+void isci_device_clear_reset_pending(struct isci_host *ihost, struct isci_remote_device *idev)
+{
+ struct isci_request *isci_request;
+ struct isci_request *tmp_req;
+ unsigned long flags = 0;
+
+ dev_dbg(&ihost->pdev->dev, "%s: idev=%p, ihost=%p\n",
+ __func__, idev, ihost);
+
+ spin_lock_irqsave(&ihost->scic_lock, flags);
+
+ /* Clear reset pending on all pending requests. */
+ list_for_each_entry_safe(isci_request, tmp_req,
+ &idev->reqs_in_process, dev_node) {
+ dev_dbg(&ihost->pdev->dev, "%s: idev = %p request = %p\n",
+ __func__, idev, isci_request);
+
+ if (isci_request->ttype == io_task) {
+
+ unsigned long flags2;
+ struct sas_task *task = isci_request_access_task(
+ isci_request);
+
+ spin_lock_irqsave(&task->task_state_lock, flags2);
+ task->task_state_flags &= ~SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, flags2);
+ }
+ }
+ spin_unlock_irqrestore(&ihost->scic_lock, flags);
+}

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