ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/drivers/scsi/libsas/sas_scsi_host.c b/marvell/linux/drivers/scsi/libsas/sas_scsi_host.c
new file mode 100644
index 0000000..081f314
--- /dev/null
+++ b/marvell/linux/drivers/scsi/libsas/sas_scsi_host.c
@@ -0,0 +1,970 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Serial Attached SCSI (SAS) class SCSI Host glue.
+ *
+ * Copyright (C) 2005 Adaptec, Inc. All rights reserved.
+ * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
+ */
+
+#include <linux/kthread.h>
+#include <linux/firmware.h>
+#include <linux/export.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+
+#include "sas_internal.h"
+
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include <scsi/sas_ata.h>
+#include "../scsi_sas_internal.h"
+#include "../scsi_transport_api.h"
+#include "../scsi_priv.h"
+
+#include <linux/err.h>
+#include <linux/blkdev.h>
+#include <linux/freezer.h>
+#include <linux/gfp.h>
+#include <linux/scatterlist.h>
+#include <linux/libata.h>
+
+/* record final status and free the task */
+static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
+{
+ struct task_status_struct *ts = &task->task_status;
+ int hs = 0, stat = 0;
+
+ if (ts->resp == SAS_TASK_UNDELIVERED) {
+ /* transport error */
+ hs = DID_NO_CONNECT;
+ } else { /* ts->resp == SAS_TASK_COMPLETE */
+ /* task delivered, what happened afterwards? */
+ switch (ts->stat) {
+ case SAS_DEV_NO_RESPONSE:
+ case SAS_INTERRUPTED:
+ case SAS_PHY_DOWN:
+ case SAS_NAK_R_ERR:
+ case SAS_OPEN_TO:
+ hs = DID_NO_CONNECT;
+ break;
+ case SAS_DATA_UNDERRUN:
+ scsi_set_resid(sc, ts->residual);
+ if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
+ hs = DID_ERROR;
+ break;
+ case SAS_DATA_OVERRUN:
+ hs = DID_ERROR;
+ break;
+ case SAS_QUEUE_FULL:
+ hs = DID_SOFT_ERROR; /* retry */
+ break;
+ case SAS_DEVICE_UNKNOWN:
+ hs = DID_BAD_TARGET;
+ break;
+ case SAS_SG_ERR:
+ hs = DID_PARITY;
+ break;
+ case SAS_OPEN_REJECT:
+ if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
+ hs = DID_SOFT_ERROR; /* retry */
+ else
+ hs = DID_ERROR;
+ break;
+ case SAS_PROTO_RESPONSE:
+ pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
+ task->dev->port->ha->sas_ha_name);
+ break;
+ case SAS_ABORTED_TASK:
+ hs = DID_ABORT;
+ break;
+ case SAM_STAT_CHECK_CONDITION:
+ memcpy(sc->sense_buffer, ts->buf,
+ min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
+ stat = SAM_STAT_CHECK_CONDITION;
+ break;
+ default:
+ stat = ts->stat;
+ break;
+ }
+ }
+
+ sc->result = (hs << 16) | stat;
+ ASSIGN_SAS_TASK(sc, NULL);
+ sas_free_task(task);
+}
+
+static void sas_scsi_task_done(struct sas_task *task)
+{
+ struct scsi_cmnd *sc = task->uldd_task;
+ struct domain_device *dev = task->dev;
+ struct sas_ha_struct *ha = dev->port->ha;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->done_lock, flags);
+ if (test_bit(SAS_HA_FROZEN, &ha->state))
+ task = NULL;
+ else
+ ASSIGN_SAS_TASK(sc, NULL);
+ spin_unlock_irqrestore(&dev->done_lock, flags);
+
+ if (unlikely(!task)) {
+ /* task will be completed by the error handler */
+ pr_debug("task done but aborted\n");
+ return;
+ }
+
+ if (unlikely(!sc)) {
+ pr_debug("task_done called with non existing SCSI cmnd!\n");
+ sas_free_task(task);
+ return;
+ }
+
+ sas_end_task(sc, task);
+ sc->scsi_done(sc);
+}
+
+static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
+ struct domain_device *dev,
+ gfp_t gfp_flags)
+{
+ struct sas_task *task = sas_alloc_task(gfp_flags);
+ struct scsi_lun lun;
+
+ if (!task)
+ return NULL;
+
+ task->uldd_task = cmd;
+ ASSIGN_SAS_TASK(cmd, task);
+
+ task->dev = dev;
+ task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
+
+ task->ssp_task.retry_count = 1;
+ int_to_scsilun(cmd->device->lun, &lun);
+ memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
+ task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
+ task->ssp_task.cmd = cmd;
+
+ task->scatter = scsi_sglist(cmd);
+ task->num_scatter = scsi_sg_count(cmd);
+ task->total_xfer_len = scsi_bufflen(cmd);
+ task->data_dir = cmd->sc_data_direction;
+
+ task->task_done = sas_scsi_task_done;
+
+ return task;
+}
+
+int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
+{
+ struct sas_internal *i = to_sas_internal(host->transportt);
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_task *task;
+ int res = 0;
+
+ /* If the device fell off, no sense in issuing commands */
+ if (test_bit(SAS_DEV_GONE, &dev->state)) {
+ cmd->result = DID_BAD_TARGET << 16;
+ goto out_done;
+ }
+
+ if (dev_is_sata(dev)) {
+ spin_lock_irq(dev->sata_dev.ap->lock);
+ res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
+ spin_unlock_irq(dev->sata_dev.ap->lock);
+ return res;
+ }
+
+ task = sas_create_task(cmd, dev, GFP_ATOMIC);
+ if (!task)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
+ res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
+ if (res)
+ goto out_free_task;
+ return 0;
+
+out_free_task:
+ pr_debug("lldd_execute_task returned: %d\n", res);
+ ASSIGN_SAS_TASK(cmd, NULL);
+ sas_free_task(task);
+ if (res == -SAS_QUEUE_FULL)
+ cmd->result = DID_SOFT_ERROR << 16; /* retry */
+ else
+ cmd->result = DID_ERROR << 16;
+out_done:
+ cmd->scsi_done(cmd);
+ return 0;
+}
+
+static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
+{
+ struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_task *task = TO_SAS_TASK(cmd);
+
+ /* At this point, we only get called following an actual abort
+ * of the task, so we should be guaranteed not to be racing with
+ * any completions from the LLD. Task is freed after this.
+ */
+ sas_end_task(cmd, task);
+
+ if (dev_is_sata(dev)) {
+ /* defer commands to libata so that libata EH can
+ * handle ata qcs correctly
+ */
+ list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
+ return;
+ }
+
+ /* now finish the command and move it on to the error
+ * handler done list, this also takes it off the
+ * error handler pending list.
+ */
+ scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
+}
+
+static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
+{
+ struct scsi_cmnd *cmd, *n;
+
+ list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
+ if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
+ cmd->device->lun == my_cmd->device->lun)
+ sas_eh_finish_cmd(cmd);
+ }
+}
+
+static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
+ struct domain_device *dev)
+{
+ struct scsi_cmnd *cmd, *n;
+
+ list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
+ struct domain_device *x = cmd_to_domain_dev(cmd);
+
+ if (x == dev)
+ sas_eh_finish_cmd(cmd);
+ }
+}
+
+static void sas_scsi_clear_queue_port(struct list_head *error_q,
+ struct asd_sas_port *port)
+{
+ struct scsi_cmnd *cmd, *n;
+
+ list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct asd_sas_port *x = dev->port;
+
+ if (x == port)
+ sas_eh_finish_cmd(cmd);
+ }
+}
+
+enum task_disposition {
+ TASK_IS_DONE,
+ TASK_IS_ABORTED,
+ TASK_IS_AT_LU,
+ TASK_IS_NOT_AT_LU,
+ TASK_ABORT_FAILED,
+};
+
+static enum task_disposition sas_scsi_find_task(struct sas_task *task)
+{
+ unsigned long flags;
+ int i, res;
+ struct sas_internal *si =
+ to_sas_internal(task->dev->port->ha->core.shost->transportt);
+
+ for (i = 0; i < 5; i++) {
+ pr_notice("%s: aborting task 0x%p\n", __func__, task);
+ res = si->dft->lldd_abort_task(task);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ if (task->task_state_flags & SAS_TASK_STATE_DONE) {
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+ pr_debug("%s: task 0x%p is done\n", __func__, task);
+ return TASK_IS_DONE;
+ }
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ if (res == TMF_RESP_FUNC_COMPLETE) {
+ pr_notice("%s: task 0x%p is aborted\n",
+ __func__, task);
+ return TASK_IS_ABORTED;
+ } else if (si->dft->lldd_query_task) {
+ pr_notice("%s: querying task 0x%p\n", __func__, task);
+ res = si->dft->lldd_query_task(task);
+ switch (res) {
+ case TMF_RESP_FUNC_SUCC:
+ pr_notice("%s: task 0x%p at LU\n", __func__,
+ task);
+ return TASK_IS_AT_LU;
+ case TMF_RESP_FUNC_COMPLETE:
+ pr_notice("%s: task 0x%p not at LU\n",
+ __func__, task);
+ return TASK_IS_NOT_AT_LU;
+ case TMF_RESP_FUNC_FAILED:
+ pr_notice("%s: task 0x%p failed to abort\n",
+ __func__, task);
+ return TASK_ABORT_FAILED;
+ }
+
+ }
+ }
+ return res;
+}
+
+static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
+{
+ int res = TMF_RESP_FUNC_FAILED;
+ struct scsi_lun lun;
+ struct sas_internal *i =
+ to_sas_internal(dev->port->ha->core.shost->transportt);
+
+ int_to_scsilun(cmd->device->lun, &lun);
+
+ pr_notice("eh: device %llx LUN %llx has the task\n",
+ SAS_ADDR(dev->sas_addr),
+ cmd->device->lun);
+
+ if (i->dft->lldd_abort_task_set)
+ res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
+
+ if (res == TMF_RESP_FUNC_FAILED) {
+ if (i->dft->lldd_clear_task_set)
+ res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
+ }
+
+ if (res == TMF_RESP_FUNC_FAILED) {
+ if (i->dft->lldd_lu_reset)
+ res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
+ }
+
+ return res;
+}
+
+static int sas_recover_I_T(struct domain_device *dev)
+{
+ int res = TMF_RESP_FUNC_FAILED;
+ struct sas_internal *i =
+ to_sas_internal(dev->port->ha->core.shost->transportt);
+
+ pr_notice("I_T nexus reset for dev %016llx\n",
+ SAS_ADDR(dev->sas_addr));
+
+ if (i->dft->lldd_I_T_nexus_reset)
+ res = i->dft->lldd_I_T_nexus_reset(dev);
+
+ return res;
+}
+
+/* take a reference on the last known good phy for this device */
+struct sas_phy *sas_get_local_phy(struct domain_device *dev)
+{
+ struct sas_ha_struct *ha = dev->port->ha;
+ struct sas_phy *phy;
+ unsigned long flags;
+
+ /* a published domain device always has a valid phy, it may be
+ * stale, but it is never NULL
+ */
+ BUG_ON(!dev->phy);
+
+ spin_lock_irqsave(&ha->phy_port_lock, flags);
+ phy = dev->phy;
+ get_device(&phy->dev);
+ spin_unlock_irqrestore(&ha->phy_port_lock, flags);
+
+ return phy;
+}
+EXPORT_SYMBOL_GPL(sas_get_local_phy);
+
+static void sas_wait_eh(struct domain_device *dev)
+{
+ struct sas_ha_struct *ha = dev->port->ha;
+ DEFINE_WAIT(wait);
+
+ if (dev_is_sata(dev)) {
+ ata_port_wait_eh(dev->sata_dev.ap);
+ return;
+ }
+ retry:
+ spin_lock_irq(&ha->lock);
+
+ while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
+ prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
+ spin_unlock_irq(&ha->lock);
+ schedule();
+ spin_lock_irq(&ha->lock);
+ }
+ finish_wait(&ha->eh_wait_q, &wait);
+
+ spin_unlock_irq(&ha->lock);
+
+ /* make sure SCSI EH is complete */
+ if (scsi_host_in_recovery(ha->core.shost)) {
+ msleep(10);
+ goto retry;
+ }
+}
+
+static int sas_queue_reset(struct domain_device *dev, int reset_type,
+ u64 lun, int wait)
+{
+ struct sas_ha_struct *ha = dev->port->ha;
+ int scheduled = 0, tries = 100;
+
+ /* ata: promote lun reset to bus reset */
+ if (dev_is_sata(dev)) {
+ sas_ata_schedule_reset(dev);
+ if (wait)
+ sas_ata_wait_eh(dev);
+ return SUCCESS;
+ }
+
+ while (!scheduled && tries--) {
+ spin_lock_irq(&ha->lock);
+ if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
+ !test_bit(reset_type, &dev->state)) {
+ scheduled = 1;
+ ha->eh_active++;
+ list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
+ set_bit(SAS_DEV_EH_PENDING, &dev->state);
+ set_bit(reset_type, &dev->state);
+ int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
+ scsi_schedule_eh(ha->core.shost);
+ }
+ spin_unlock_irq(&ha->lock);
+
+ if (wait)
+ sas_wait_eh(dev);
+
+ if (scheduled)
+ return SUCCESS;
+ }
+
+ pr_warn("%s reset of %s failed\n",
+ reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
+ dev_name(&dev->rphy->dev));
+
+ return FAILED;
+}
+
+int sas_eh_abort_handler(struct scsi_cmnd *cmd)
+{
+ int res = TMF_RESP_FUNC_FAILED;
+ struct sas_task *task = TO_SAS_TASK(cmd);
+ struct Scsi_Host *host = cmd->device->host;
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_internal *i = to_sas_internal(host->transportt);
+ unsigned long flags;
+
+ if (!i->dft->lldd_abort_task)
+ return FAILED;
+
+ spin_lock_irqsave(host->host_lock, flags);
+ /* We cannot do async aborts for SATA devices */
+ if (dev_is_sata(dev) && !host->host_eh_scheduled) {
+ spin_unlock_irqrestore(host->host_lock, flags);
+ return FAILED;
+ }
+ spin_unlock_irqrestore(host->host_lock, flags);
+
+ if (task)
+ res = i->dft->lldd_abort_task(task);
+ else
+ pr_notice("no task to abort\n");
+ if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
+ return SUCCESS;
+
+ return FAILED;
+}
+EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
+
+/* Attempt to send a LUN reset message to a device */
+int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
+{
+ int res;
+ struct scsi_lun lun;
+ struct Scsi_Host *host = cmd->device->host;
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_internal *i = to_sas_internal(host->transportt);
+
+ if (current != host->ehandler)
+ return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
+
+ int_to_scsilun(cmd->device->lun, &lun);
+
+ if (!i->dft->lldd_lu_reset)
+ return FAILED;
+
+ res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
+ if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
+ return SUCCESS;
+
+ return FAILED;
+}
+
+int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
+{
+ int res;
+ struct Scsi_Host *host = cmd->device->host;
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_internal *i = to_sas_internal(host->transportt);
+
+ if (current != host->ehandler)
+ return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
+
+ if (!i->dft->lldd_I_T_nexus_reset)
+ return FAILED;
+
+ res = i->dft->lldd_I_T_nexus_reset(dev);
+ if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
+ res == -ENODEV)
+ return SUCCESS;
+
+ return FAILED;
+}
+
+/* Try to reset a device */
+static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
+{
+ int res;
+ struct Scsi_Host *shost = cmd->device->host;
+
+ if (!shost->hostt->eh_device_reset_handler)
+ goto try_target_reset;
+
+ res = shost->hostt->eh_device_reset_handler(cmd);
+ if (res == SUCCESS)
+ return res;
+
+try_target_reset:
+ if (shost->hostt->eh_target_reset_handler)
+ return shost->hostt->eh_target_reset_handler(cmd);
+
+ return FAILED;
+}
+
+static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
+{
+ struct scsi_cmnd *cmd, *n;
+ enum task_disposition res = TASK_IS_DONE;
+ int tmf_resp, need_reset;
+ struct sas_internal *i = to_sas_internal(shost->transportt);
+ unsigned long flags;
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ LIST_HEAD(done);
+
+ /* clean out any commands that won the completion vs eh race */
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
+ struct domain_device *dev = cmd_to_domain_dev(cmd);
+ struct sas_task *task;
+
+ spin_lock_irqsave(&dev->done_lock, flags);
+ /* by this point the lldd has either observed
+ * SAS_HA_FROZEN and is leaving the task alone, or has
+ * won the race with eh and decided to complete it
+ */
+ task = TO_SAS_TASK(cmd);
+ spin_unlock_irqrestore(&dev->done_lock, flags);
+
+ if (!task)
+ list_move_tail(&cmd->eh_entry, &done);
+ }
+
+ Again:
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
+ struct sas_task *task = TO_SAS_TASK(cmd);
+
+ list_del_init(&cmd->eh_entry);
+
+ spin_lock_irqsave(&task->task_state_lock, flags);
+ need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
+ spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+ if (need_reset) {
+ pr_notice("%s: task 0x%p requests reset\n",
+ __func__, task);
+ goto reset;
+ }
+
+ pr_debug("trying to find task 0x%p\n", task);
+ res = sas_scsi_find_task(task);
+
+ switch (res) {
+ case TASK_IS_DONE:
+ pr_notice("%s: task 0x%p is done\n", __func__,
+ task);
+ sas_eh_finish_cmd(cmd);
+ continue;
+ case TASK_IS_ABORTED:
+ pr_notice("%s: task 0x%p is aborted\n",
+ __func__, task);
+ sas_eh_finish_cmd(cmd);
+ continue;
+ case TASK_IS_AT_LU:
+ pr_info("task 0x%p is at LU: lu recover\n", task);
+ reset:
+ tmf_resp = sas_recover_lu(task->dev, cmd);
+ if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
+ pr_notice("dev %016llx LU %llx is recovered\n",
+ SAS_ADDR(task->dev),
+ cmd->device->lun);
+ sas_eh_finish_cmd(cmd);
+ sas_scsi_clear_queue_lu(work_q, cmd);
+ goto Again;
+ }
+ /* fallthrough */
+ case TASK_IS_NOT_AT_LU:
+ case TASK_ABORT_FAILED:
+ pr_notice("task 0x%p is not at LU: I_T recover\n",
+ task);
+ tmf_resp = sas_recover_I_T(task->dev);
+ if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
+ tmf_resp == -ENODEV) {
+ struct domain_device *dev = task->dev;
+ pr_notice("I_T %016llx recovered\n",
+ SAS_ADDR(task->dev->sas_addr));
+ sas_eh_finish_cmd(cmd);
+ sas_scsi_clear_queue_I_T(work_q, dev);
+ goto Again;
+ }
+ /* Hammer time :-) */
+ try_to_reset_cmd_device(cmd);
+ if (i->dft->lldd_clear_nexus_port) {
+ struct asd_sas_port *port = task->dev->port;
+ pr_debug("clearing nexus for port:%d\n",
+ port->id);
+ res = i->dft->lldd_clear_nexus_port(port);
+ if (res == TMF_RESP_FUNC_COMPLETE) {
+ pr_notice("clear nexus port:%d succeeded\n",
+ port->id);
+ sas_eh_finish_cmd(cmd);
+ sas_scsi_clear_queue_port(work_q,
+ port);
+ goto Again;
+ }
+ }
+ if (i->dft->lldd_clear_nexus_ha) {
+ pr_debug("clear nexus ha\n");
+ res = i->dft->lldd_clear_nexus_ha(ha);
+ if (res == TMF_RESP_FUNC_COMPLETE) {
+ pr_notice("clear nexus ha succeeded\n");
+ sas_eh_finish_cmd(cmd);
+ goto clear_q;
+ }
+ }
+ /* If we are here -- this means that no amount
+ * of effort could recover from errors. Quite
+ * possibly the HA just disappeared.
+ */
+ pr_err("error from device %llx, LUN %llx couldn't be recovered in any way\n",
+ SAS_ADDR(task->dev->sas_addr),
+ cmd->device->lun);
+
+ sas_eh_finish_cmd(cmd);
+ goto clear_q;
+ }
+ }
+ out:
+ list_splice_tail(&done, work_q);
+ list_splice_tail_init(&ha->eh_ata_q, work_q);
+ return;
+
+ clear_q:
+ pr_debug("--- Exit %s -- clear_q\n", __func__);
+ list_for_each_entry_safe(cmd, n, work_q, eh_entry)
+ sas_eh_finish_cmd(cmd);
+ goto out;
+}
+
+static void sas_eh_handle_resets(struct Scsi_Host *shost)
+{
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ struct sas_internal *i = to_sas_internal(shost->transportt);
+
+ /* handle directed resets to sas devices */
+ spin_lock_irq(&ha->lock);
+ while (!list_empty(&ha->eh_dev_q)) {
+ struct domain_device *dev;
+ struct ssp_device *ssp;
+
+ ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
+ list_del_init(&ssp->eh_list_node);
+ dev = container_of(ssp, typeof(*dev), ssp_dev);
+ kref_get(&dev->kref);
+ WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
+
+ spin_unlock_irq(&ha->lock);
+
+ if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
+ i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
+
+ if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
+ i->dft->lldd_I_T_nexus_reset(dev);
+
+ sas_put_device(dev);
+ spin_lock_irq(&ha->lock);
+ clear_bit(SAS_DEV_EH_PENDING, &dev->state);
+ ha->eh_active--;
+ }
+ spin_unlock_irq(&ha->lock);
+}
+
+
+void sas_scsi_recover_host(struct Scsi_Host *shost)
+{
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ LIST_HEAD(eh_work_q);
+ int tries = 0;
+ bool retry;
+
+retry:
+ tries++;
+ retry = true;
+ spin_lock_irq(shost->host_lock);
+ list_splice_init(&shost->eh_cmd_q, &eh_work_q);
+ spin_unlock_irq(shost->host_lock);
+
+ pr_notice("Enter %s busy: %d failed: %d\n",
+ __func__, scsi_host_busy(shost), shost->host_failed);
+ /*
+ * Deal with commands that still have SAS tasks (i.e. they didn't
+ * complete via the normal sas_task completion mechanism),
+ * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
+ */
+ set_bit(SAS_HA_FROZEN, &ha->state);
+ sas_eh_handle_sas_errors(shost, &eh_work_q);
+ clear_bit(SAS_HA_FROZEN, &ha->state);
+ if (list_empty(&eh_work_q))
+ goto out;
+
+ /*
+ * Now deal with SCSI commands that completed ok but have a an error
+ * code (and hopefully sense data) attached. This is roughly what
+ * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
+ * command we see here has no sas_task and is thus unknown to the HA.
+ */
+ sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
+ if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
+ scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
+
+out:
+ sas_eh_handle_resets(shost);
+
+ /* now link into libata eh --- if we have any ata devices */
+ sas_ata_strategy_handler(shost);
+
+ scsi_eh_flush_done_q(&ha->eh_done_q);
+
+ /* check if any new eh work was scheduled during the last run */
+ spin_lock_irq(&ha->lock);
+ if (ha->eh_active == 0) {
+ shost->host_eh_scheduled = 0;
+ retry = false;
+ }
+ spin_unlock_irq(&ha->lock);
+
+ if (retry)
+ goto retry;
+
+ pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
+ __func__, scsi_host_busy(shost),
+ shost->host_failed, tries);
+}
+
+int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
+{
+ struct domain_device *dev = sdev_to_domain_dev(sdev);
+
+ if (dev_is_sata(dev))
+ return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
+
+ return -EINVAL;
+}
+
+struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
+{
+ struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
+ struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
+ struct domain_device *found_dev = NULL;
+ int i;
+ unsigned long flags;
+
+ spin_lock_irqsave(&ha->phy_port_lock, flags);
+ for (i = 0; i < ha->num_phys; i++) {
+ struct asd_sas_port *port = ha->sas_port[i];
+ struct domain_device *dev;
+
+ spin_lock(&port->dev_list_lock);
+ list_for_each_entry(dev, &port->dev_list, dev_list_node) {
+ if (rphy == dev->rphy) {
+ found_dev = dev;
+ spin_unlock(&port->dev_list_lock);
+ goto found;
+ }
+ }
+ spin_unlock(&port->dev_list_lock);
+ }
+ found:
+ spin_unlock_irqrestore(&ha->phy_port_lock, flags);
+
+ return found_dev;
+}
+
+int sas_target_alloc(struct scsi_target *starget)
+{
+ struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
+ struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
+
+ if (!found_dev)
+ return -ENODEV;
+
+ kref_get(&found_dev->kref);
+ starget->hostdata = found_dev;
+ return 0;
+}
+
+#define SAS_DEF_QD 256
+
+int sas_slave_configure(struct scsi_device *scsi_dev)
+{
+ struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
+
+ BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
+
+ if (dev_is_sata(dev)) {
+ ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
+ return 0;
+ }
+
+ sas_read_port_mode_page(scsi_dev);
+
+ if (scsi_dev->tagged_supported) {
+ scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
+ } else {
+ pr_notice("device %llx, LUN %llx doesn't support TCQ\n",
+ SAS_ADDR(dev->sas_addr), scsi_dev->lun);
+ scsi_change_queue_depth(scsi_dev, 1);
+ }
+
+ scsi_dev->allow_restart = 1;
+
+ return 0;
+}
+
+int sas_change_queue_depth(struct scsi_device *sdev, int depth)
+{
+ struct domain_device *dev = sdev_to_domain_dev(sdev);
+
+ if (dev_is_sata(dev))
+ return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
+
+ if (!sdev->tagged_supported)
+ depth = 1;
+ return scsi_change_queue_depth(sdev, depth);
+}
+
+int sas_bios_param(struct scsi_device *scsi_dev,
+ struct block_device *bdev,
+ sector_t capacity, int *hsc)
+{
+ hsc[0] = 255;
+ hsc[1] = 63;
+ sector_div(capacity, 255*63);
+ hsc[2] = capacity;
+
+ return 0;
+}
+
+/*
+ * Tell an upper layer that it needs to initiate an abort for a given task.
+ * This should only ever be called by an LLDD.
+ */
+void sas_task_abort(struct sas_task *task)
+{
+ struct scsi_cmnd *sc = task->uldd_task;
+
+ /* Escape for libsas internal commands */
+ if (!sc) {
+ struct sas_task_slow *slow = task->slow_task;
+
+ if (!slow)
+ return;
+ if (!del_timer(&slow->timer))
+ return;
+ slow->timer.function(&slow->timer);
+ return;
+ }
+
+ if (dev_is_sata(task->dev))
+ sas_ata_task_abort(task);
+ else
+ blk_abort_request(sc->request);
+}
+
+int sas_slave_alloc(struct scsi_device *sdev)
+{
+ if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
+ return -ENXIO;
+
+ return 0;
+}
+
+void sas_target_destroy(struct scsi_target *starget)
+{
+ struct domain_device *found_dev = starget->hostdata;
+
+ if (!found_dev)
+ return;
+
+ starget->hostdata = NULL;
+ sas_put_device(found_dev);
+}
+
+#define SAS_STRING_ADDR_SIZE 16
+
+int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
+{
+ int res;
+ const struct firmware *fw;
+
+ res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
+ if (res)
+ return res;
+
+ if (fw->size < SAS_STRING_ADDR_SIZE) {
+ res = -ENODEV;
+ goto out;
+ }
+
+ res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
+ if (res)
+ goto out;
+
+out:
+ release_firmware(fw);
+ return res;
+}
+EXPORT_SYMBOL_GPL(sas_request_addr);
+
+EXPORT_SYMBOL_GPL(sas_queuecommand);
+EXPORT_SYMBOL_GPL(sas_target_alloc);
+EXPORT_SYMBOL_GPL(sas_slave_configure);
+EXPORT_SYMBOL_GPL(sas_change_queue_depth);
+EXPORT_SYMBOL_GPL(sas_bios_param);
+EXPORT_SYMBOL_GPL(sas_task_abort);
+EXPORT_SYMBOL_GPL(sas_phy_reset);
+EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
+EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
+EXPORT_SYMBOL_GPL(sas_slave_alloc);
+EXPORT_SYMBOL_GPL(sas_target_destroy);
+EXPORT_SYMBOL_GPL(sas_ioctl);