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sas_scsi_host.c

/*
 * 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>
 *
 * This file is licensed under GPLv2.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 *
 */

#include <linux/kthread.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/scatterlist.h>
#include <linux/libata.h>

/* ---------- SCSI Host glue ---------- */

static void sas_scsi_task_done(struct sas_task *task)
{
      struct task_status_struct *ts = &task->task_status;
      struct scsi_cmnd *sc = task->uldd_task;
      struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
      unsigned ts_flags = task->task_state_flags;
      int hs = 0, stat = 0;

      if (unlikely(!sc)) {
            SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
            list_del_init(&task->list);
            sas_free_task(task);
            return;
      }

      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:
                  SAS_DPRINTK("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_CHECK_COND:
                  memcpy(sc->sense_buffer, ts->buf,
                         max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
                  stat = SAM_CHECK_COND;
                  break;
            default:
                  stat = ts->stat;
                  break;
            }
      }
      ASSIGN_SAS_TASK(sc, NULL);
      sc->result = (hs << 16) | stat;
      list_del_init(&task->list);
      sas_free_task(task);
      /* This is very ugly but this is how SCSI Core works. */
      if (ts_flags & SAS_TASK_STATE_ABORTED)
            scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
      else
            sc->scsi_done(sc);
}

static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
{
      enum task_attribute ta = TASK_ATTR_SIMPLE;
      if (cmd->request && blk_rq_tagged(cmd->request)) {
            if (cmd->device->ordered_tags &&
                (cmd->request->cmd_flags & REQ_HARDBARRIER))
                  ta = TASK_ATTR_ORDERED;
      }
      return ta;
}

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;

      *(u32 *)cmd->sense_buffer = 0;
      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 = sas_scsi_get_task_attr(cmd);
      memcpy(task->ssp_task.cdb, cmd->cmnd, 16);

      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_queue_up(struct sas_task *task)
{
      struct sas_ha_struct *sas_ha = task->dev->port->ha;
      struct scsi_core *core = &sas_ha->core;
      unsigned long flags;
      LIST_HEAD(list);

      spin_lock_irqsave(&core->task_queue_lock, flags);
      if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
            spin_unlock_irqrestore(&core->task_queue_lock, flags);
            return -SAS_QUEUE_FULL;
      }
      list_add_tail(&task->list, &core->task_queue);
      core->task_queue_size += 1;
      spin_unlock_irqrestore(&core->task_queue_lock, flags);
      wake_up_process(core->queue_thread);

      return 0;
}

/**
 * sas_queuecommand -- Enqueue a command for processing
 * @parameters: See SCSI Core documentation
 *
 * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 * call us without holding an IRQ spinlock...
 */
int sas_queuecommand(struct scsi_cmnd *cmd,
                 void (*scsi_done)(struct scsi_cmnd *))
{
      int res = 0;
      struct domain_device *dev = cmd_to_domain_dev(cmd);
      struct Scsi_Host *host = cmd->device->host;
      struct sas_internal *i = to_sas_internal(host->transportt);

      spin_unlock_irq(host->host_lock);

      {
            struct sas_ha_struct *sas_ha = dev->port->ha;
            struct sas_task *task;

            if (dev_is_sata(dev)) {
                  unsigned long flags;

                  spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
                  res = ata_sas_queuecmd(cmd, scsi_done,
                                     dev->sata_dev.ap);
                  spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
                  goto out;
            }

            res = -ENOMEM;
            task = sas_create_task(cmd, dev, GFP_ATOMIC);
            if (!task)
                  goto out;

            cmd->scsi_done = scsi_done;
            /* Queue up, Direct Mode or Task Collector Mode. */
            if (sas_ha->lldd_max_execute_num < 2)
                  res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
            else
                  res = sas_queue_up(task);

            /* Examine */
            if (res) {
                  SAS_DPRINTK("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 */
                        res = 0;
                        scsi_done(cmd);
                  }
                  goto out;
            }
      }
out:
      spin_lock_irq(host->host_lock);
      return res;
}

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 == my_cmd)
                  list_del_init(&cmd->eh_entry);
      }
}

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)
                  list_del_init(&cmd->eh_entry);
      }
}

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)
                  list_del_init(&cmd->eh_entry);
      }
}

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)
{
      struct sas_ha_struct *ha = task->dev->port->ha;
      unsigned long flags;
      int i, res;
      struct sas_internal *si =
            to_sas_internal(task->dev->port->ha->core.shost->transportt);

      if (ha->lldd_max_execute_num > 1) {
            struct scsi_core *core = &ha->core;
            struct sas_task *t, *n;

            spin_lock_irqsave(&core->task_queue_lock, flags);
            list_for_each_entry_safe(t, n, &core->task_queue, list) {
                  if (task == t) {
                        list_del_init(&t->list);
                        spin_unlock_irqrestore(&core->task_queue_lock,
                                           flags);
                        SAS_DPRINTK("%s: task 0x%p aborted from "
                                  "task_queue\n",
                                  __FUNCTION__, task);
                        return TASK_IS_ABORTED;
                  }
            }
            spin_unlock_irqrestore(&core->task_queue_lock, flags);
      }

      for (i = 0; i < 5; i++) {
            SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, 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);
                  SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
                            task);
                  return TASK_IS_DONE;
            }
            spin_unlock_irqrestore(&task->task_state_lock, flags);

            if (res == TMF_RESP_FUNC_COMPLETE) {
                  SAS_DPRINTK("%s: task 0x%p is aborted\n",
                            __FUNCTION__, task);
                  return TASK_IS_ABORTED;
            } else if (si->dft->lldd_query_task) {
                  SAS_DPRINTK("%s: querying task 0x%p\n",
                            __FUNCTION__, task);
                  res = si->dft->lldd_query_task(task);
                  switch (res) {
                  case TMF_RESP_FUNC_SUCC:
                        SAS_DPRINTK("%s: task 0x%p at LU\n",
                                  __FUNCTION__, task);
                        return TASK_IS_AT_LU;
                  case TMF_RESP_FUNC_COMPLETE:
                        SAS_DPRINTK("%s: task 0x%p not at LU\n",
                                  __FUNCTION__, task);
                        return TASK_IS_NOT_AT_LU;
                  case TMF_RESP_FUNC_FAILED:
                                SAS_DPRINTK("%s: task 0x%p failed to abort\n",
                                                __FUNCTION__, 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);

      SAS_DPRINTK("eh: device %llx LUN %x 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);

      SAS_DPRINTK("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;
}

/* Find the sas_phy that's attached to this device */
struct sas_phy *find_local_sas_phy(struct domain_device *dev)
{
      struct domain_device *pdev = dev->parent;
      struct ex_phy *exphy = NULL;
      int i;

      /* Directly attached device */
      if (!pdev)
            return dev->port->phy;

      /* Otherwise look in the expander */
      for (i = 0; i < pdev->ex_dev.num_phys; i++)
            if (!memcmp(dev->sas_addr,
                      pdev->ex_dev.ex_phy[i].attached_sas_addr,
                      SAS_ADDR_SIZE)) {
                  exphy = &pdev->ex_dev.ex_phy[i];
                  break;
            }

      BUG_ON(!exphy);
      return exphy->phy;
}

/* Attempt to send a LUN reset message to a device */
int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
{
      struct domain_device *dev = cmd_to_domain_dev(cmd);
      struct sas_internal *i =
            to_sas_internal(dev->port->ha->core.shost->transportt);
      struct scsi_lun lun;
      int res;

      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;
}

/* Attempt to send a phy (bus) reset */
int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
{
      struct domain_device *dev = cmd_to_domain_dev(cmd);
      struct sas_phy *phy = find_local_sas_phy(dev);
      int res;

      res = sas_phy_reset(phy, 1);
      if (res)
            SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
                      phy->dev.kobj.k_name,
                      res);
      if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
            return SUCCESS;

      return FAILED;
}

/* Try to reset a device */
static int try_to_reset_cmd_device(struct Scsi_Host *shost,
                           struct scsi_cmnd *cmd)
{
      int res;

      if (!shost->hostt->eh_device_reset_handler)
            goto try_bus_reset;

      res = shost->hostt->eh_device_reset_handler(cmd);
      if (res == SUCCESS)
            return res;

try_bus_reset:
      if (shost->hostt->eh_bus_reset_handler)
            return shost->hostt->eh_bus_reset_handler(cmd);

      return FAILED;
}

static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
                            struct list_head *work_q,
                            struct list_head *done_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);

Again:
      list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
            struct sas_task *task = TO_SAS_TASK(cmd);

            if (!task)
                  continue;

            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);

            SAS_DPRINTK("trying to find task 0x%p\n", task);
            res = sas_scsi_find_task(task);

            cmd->eh_eflags = 0;

            switch (res) {
            case TASK_IS_DONE:
                  SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
                            task);
                  task->task_done(task);
                  if (need_reset)
                        try_to_reset_cmd_device(shost, cmd);
                  continue;
            case TASK_IS_ABORTED:
                  SAS_DPRINTK("%s: task 0x%p is aborted\n",
                            __FUNCTION__, task);
                  task->task_done(task);
                  if (need_reset)
                        try_to_reset_cmd_device(shost, cmd);
                  continue;
            case TASK_IS_AT_LU:
                  SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
                  tmf_resp = sas_recover_lu(task->dev, cmd);
                  if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
                        SAS_DPRINTK("dev %016llx LU %x is "
                                  "recovered\n",
                                  SAS_ADDR(task->dev),
                                  cmd->device->lun);
                        task->task_done(task);
                        if (need_reset)
                              try_to_reset_cmd_device(shost, cmd);
                        sas_scsi_clear_queue_lu(work_q, cmd);
                        goto Again;
                  }
                  /* fallthrough */
            case TASK_IS_NOT_AT_LU:
            case TASK_ABORT_FAILED:
                  SAS_DPRINTK("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) {
                        SAS_DPRINTK("I_T %016llx recovered\n",
                                  SAS_ADDR(task->dev->sas_addr));
                        task->task_done(task);
                        if (need_reset)
                              try_to_reset_cmd_device(shost, cmd);
                        sas_scsi_clear_queue_I_T(work_q, task->dev);
                        goto Again;
                  }
                  /* Hammer time :-) */
                  if (i->dft->lldd_clear_nexus_port) {
                        struct asd_sas_port *port = task->dev->port;
                        SAS_DPRINTK("clearing nexus for port:%d\n",
                                  port->id);
                        res = i->dft->lldd_clear_nexus_port(port);
                        if (res == TMF_RESP_FUNC_COMPLETE) {
                              SAS_DPRINTK("clear nexus port:%d "
                                        "succeeded\n", port->id);
                              task->task_done(task);
                              if (need_reset)
                                    try_to_reset_cmd_device(shost, cmd);
                              sas_scsi_clear_queue_port(work_q,
                                                  port);
                              goto Again;
                        }
                  }
                  if (i->dft->lldd_clear_nexus_ha) {
                        SAS_DPRINTK("clear nexus ha\n");
                        res = i->dft->lldd_clear_nexus_ha(ha);
                        if (res == TMF_RESP_FUNC_COMPLETE) {
                              SAS_DPRINTK("clear nexus ha "
                                        "succeeded\n");
                              task->task_done(task);
                              if (need_reset)
                                    try_to_reset_cmd_device(shost, cmd);
                              goto out;
                        }
                  }
                  /* If we are here -- this means that no amount
                   * of effort could recover from errors.  Quite
                   * possibly the HA just disappeared.
                   */
                  SAS_DPRINTK("error from  device %llx, LUN %x "
                            "couldn't be recovered in any way\n",
                            SAS_ADDR(task->dev->sas_addr),
                            cmd->device->lun);

                  task->task_done(task);
                  if (need_reset)
                        try_to_reset_cmd_device(shost, cmd);
                  goto clear_q;
            }
      }
out:
      return list_empty(work_q);
clear_q:
      SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
      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);
            task->task_done(task);
      }
      return list_empty(work_q);
}

void sas_scsi_recover_host(struct Scsi_Host *shost)
{
      struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
      unsigned long flags;
      LIST_HEAD(eh_work_q);

      spin_lock_irqsave(shost->host_lock, flags);
      list_splice_init(&shost->eh_cmd_q, &eh_work_q);
      spin_unlock_irqrestore(shost->host_lock, flags);

      SAS_DPRINTK("Enter %s\n", __FUNCTION__);
      /*
       * Deal with commands that still have SAS tasks (i.e. they didn't
       * complete via the normal sas_task completion mechanism)
       */
      if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_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.
       */
      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:
      scsi_eh_flush_done_q(&ha->eh_done_q);
      SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
      return;
}

enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
{
      struct sas_task *task = TO_SAS_TASK(cmd);
      unsigned long flags;

      if (!task) {
            cmd->timeout_per_command /= 2;
            SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
                      cmd, task, (cmd->timeout_per_command ?
                      "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
            if (!cmd->timeout_per_command)
                  return EH_NOT_HANDLED;
            return EH_RESET_TIMER;
      }

      spin_lock_irqsave(&task->task_state_lock, flags);
      BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
      if (task->task_state_flags & SAS_TASK_STATE_DONE) {
            spin_unlock_irqrestore(&task->task_state_lock, flags);
            SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
                      cmd, task);
            return EH_HANDLED;
      }
      if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
            spin_unlock_irqrestore(&task->task_state_lock, flags);
            SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
                      "EH_RESET_TIMER\n",
                      cmd, task);
            return EH_RESET_TIMER;
      }
      task->task_state_flags |= SAS_TASK_STATE_ABORTED;
      spin_unlock_irqrestore(&task->task_state_lock, flags);

      SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
                cmd, task);

      return EH_NOT_HANDLED;
}

int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
{
      struct domain_device *dev = sdev_to_domain_dev(sdev);

      if (dev_is_sata(dev))
            return ata_scsi_ioctl(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;
}

static inline struct domain_device *sas_find_target(struct scsi_target *starget)
{
      struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);

      return sas_find_dev_by_rphy(rphy);
}

int sas_target_alloc(struct scsi_target *starget)
{
      struct domain_device *found_dev = sas_find_target(starget);
      int res;

      if (!found_dev)
            return -ENODEV;

      if (dev_is_sata(found_dev)) {
            res = sas_ata_init_host_and_port(found_dev, starget);
            if (res)
                  return res;
      }

      starget->hostdata = found_dev;
      return 0;
}

#define SAS_DEF_QD 32
#define SAS_MAX_QD 64

int sas_slave_configure(struct scsi_device *scsi_dev)
{
      struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
      struct sas_ha_struct *sas_ha;

      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_ha = dev->port->ha;

      sas_read_port_mode_page(scsi_dev);

      if (scsi_dev->tagged_supported) {
            scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
            scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
      } else {
            SAS_DPRINTK("device %llx, LUN %x doesn't support "
                      "TCQ\n", SAS_ADDR(dev->sas_addr),
                      scsi_dev->lun);
            scsi_dev->tagged_supported = 0;
            scsi_set_tag_type(scsi_dev, 0);
            scsi_deactivate_tcq(scsi_dev, 1);
      }

      scsi_dev->allow_restart = 1;

      return 0;
}

void sas_slave_destroy(struct scsi_device *scsi_dev)
{
      struct domain_device *dev = sdev_to_domain_dev(scsi_dev);

      if (dev_is_sata(dev))
            ata_port_disable(dev->sata_dev.ap);
}

int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
{
      int res = min(new_depth, SAS_MAX_QD);

      if (scsi_dev->tagged_supported)
            scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
                              res);
      else {
            struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
            sas_printk("device %llx LUN %x queue depth changed to 1\n",
                     SAS_ADDR(dev->sas_addr),
                     scsi_dev->lun);
            scsi_adjust_queue_depth(scsi_dev, 0, 1);
            res = 1;
      }

      return res;
}

int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
{
      if (!scsi_dev->tagged_supported)
            return 0;

      scsi_deactivate_tcq(scsi_dev, 1);

      scsi_set_tag_type(scsi_dev, qt);
      scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);

      return qt;
}

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;
}

/* ---------- Task Collector Thread implementation ---------- */

static void sas_queue(struct sas_ha_struct *sas_ha)
{
      struct scsi_core *core = &sas_ha->core;
      unsigned long flags;
      LIST_HEAD(q);
      int can_queue;
      int res;
      struct sas_internal *i = to_sas_internal(core->shost->transportt);

      spin_lock_irqsave(&core->task_queue_lock, flags);
      while (!kthread_should_stop() &&
             !list_empty(&core->task_queue)) {

            can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
            if (can_queue >= 0) {
                  can_queue = core->task_queue_size;
                  list_splice_init(&core->task_queue, &q);
            } else {
                  struct list_head *a, *n;

                  can_queue = sas_ha->lldd_queue_size;
                  list_for_each_safe(a, n, &core->task_queue) {
                        list_move_tail(a, &q);
                        if (--can_queue == 0)
                              break;
                  }
                  can_queue = sas_ha->lldd_queue_size;
            }
            core->task_queue_size -= can_queue;
            spin_unlock_irqrestore(&core->task_queue_lock, flags);
            {
                  struct sas_task *task = list_entry(q.next,
                                             struct sas_task,
                                             list);
                  list_del_init(&q);
                  res = i->dft->lldd_execute_task(task, can_queue,
                                          GFP_KERNEL);
                  if (unlikely(res))
                        __list_add(&q, task->list.prev, &task->list);
            }
            spin_lock_irqsave(&core->task_queue_lock, flags);
            if (res) {
                  list_splice_init(&q, &core->task_queue); /*at head*/
                  core->task_queue_size += can_queue;
            }
      }
      spin_unlock_irqrestore(&core->task_queue_lock, flags);
}

/**
 * sas_queue_thread -- The Task Collector thread
 * @_sas_ha: pointer to struct sas_ha
 */
static int sas_queue_thread(void *_sas_ha)
{
      struct sas_ha_struct *sas_ha = _sas_ha;

      while (1) {
            set_current_state(TASK_INTERRUPTIBLE);
            schedule();
            sas_queue(sas_ha);
            if (kthread_should_stop())
                  break;
      }

      return 0;
}

int sas_init_queue(struct sas_ha_struct *sas_ha)
{
      struct scsi_core *core = &sas_ha->core;

      spin_lock_init(&core->task_queue_lock);
      core->task_queue_size = 0;
      INIT_LIST_HEAD(&core->task_queue);

      core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
                               "sas_queue_%d", core->shost->host_no);
      if (IS_ERR(core->queue_thread))
            return PTR_ERR(core->queue_thread);
      return 0;
}

void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
{
      unsigned long flags;
      struct scsi_core *core = &sas_ha->core;
      struct sas_task *task, *n;

      kthread_stop(core->queue_thread);

      if (!list_empty(&core->task_queue))
            SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
                      SAS_ADDR(sas_ha->sas_addr));

      spin_lock_irqsave(&core->task_queue_lock, flags);
      list_for_each_entry_safe(task, n, &core->task_queue, list) {
            struct scsi_cmnd *cmd = task->uldd_task;

            list_del_init(&task->list);

            ASSIGN_SAS_TASK(cmd, NULL);
            sas_free_task(task);
            cmd->result = DID_ABORT << 16;
            cmd->scsi_done(cmd);
      }
      spin_unlock_irqrestore(&core->task_queue_lock, flags);
}

/*
 * Call the LLDD task abort routine directly.  This function is intended for
 * use by upper layers that need to tell the LLDD to abort a task.
 */
int __sas_task_abort(struct sas_task *task)
{
      struct sas_internal *si =
            to_sas_internal(task->dev->port->ha->core.shost->transportt);
      unsigned long flags;
      int res;

      spin_lock_irqsave(&task->task_state_lock, flags);
      if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
          task->task_state_flags & SAS_TASK_STATE_DONE) {
            spin_unlock_irqrestore(&task->task_state_lock, flags);
            SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
                      task);
            return 0;
      }
      task->task_state_flags |= SAS_TASK_STATE_ABORTED;
      spin_unlock_irqrestore(&task->task_state_lock, flags);

      if (!si->dft->lldd_abort_task)
            return -ENODEV;

      res = si->dft->lldd_abort_task(task);

      spin_lock_irqsave(&task->task_state_lock, flags);
      if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
          (res == TMF_RESP_FUNC_COMPLETE))
      {
            spin_unlock_irqrestore(&task->task_state_lock, flags);
            task->task_done(task);
            return 0;
      }

      if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
            task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
      spin_unlock_irqrestore(&task->task_state_lock, flags);

      return -EAGAIN;
}

/*
 * 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) {
            if (!del_timer(&task->timer))
                  return;
            task->timer.function(task->timer.data);
            return;
      }

      if (dev_is_sata(task->dev)) {
            sas_ata_task_abort(task);
            return;
      }

      scsi_req_abort_cmd(sc);
      scsi_schedule_eh(sc->device->host);
}

int sas_slave_alloc(struct scsi_device *scsi_dev)
{
      struct domain_device *dev = sdev_to_domain_dev(scsi_dev);

      if (dev_is_sata(dev))
            return ata_sas_port_init(dev->sata_dev.ap);

      return 0;
}

void sas_target_destroy(struct scsi_target *starget)
{
      struct domain_device *found_dev = sas_find_target(starget);

      if (!found_dev)
            return;

      if (dev_is_sata(found_dev))
            ata_sas_port_destroy(found_dev->sata_dev.ap);

      return;
}

EXPORT_SYMBOL_GPL(sas_queuecommand);
EXPORT_SYMBOL_GPL(sas_target_alloc);
EXPORT_SYMBOL_GPL(sas_slave_configure);
EXPORT_SYMBOL_GPL(sas_slave_destroy);
EXPORT_SYMBOL_GPL(sas_change_queue_depth);
EXPORT_SYMBOL_GPL(sas_change_queue_type);
EXPORT_SYMBOL_GPL(sas_bios_param);
EXPORT_SYMBOL_GPL(__sas_task_abort);
EXPORT_SYMBOL_GPL(sas_task_abort);
EXPORT_SYMBOL_GPL(sas_phy_reset);
EXPORT_SYMBOL_GPL(sas_phy_enable);
EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
EXPORT_SYMBOL_GPL(sas_slave_alloc);
EXPORT_SYMBOL_GPL(sas_target_destroy);
EXPORT_SYMBOL_GPL(sas_ioctl);

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