/*
 *  linux/drivers/scsi/esas2r/esas2r_int.c
 *      esas2r interrupt handling
 *
 *  Copyright (c) 2001-2013 ATTO Technology, Inc.
 *  (mailto:linuxdrivers@attotech.com)
 */
/*=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=*/
/*
 *  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; version 2 of the License.
 *
 *  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.
 *
 *  NO WARRANTY
 *  THE PROGRAM IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR
 *  CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT
 *  LIMITATION, ANY WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT,
 *  MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Each Recipient is
 *  solely responsible for determining the appropriateness of using and
 *  distributing the Program and assumes all risks associated with its
 *  exercise of rights under this Agreement, including but not limited to
 *  the risks and costs of program errors, damage to or loss of data,
 *  programs or equipment, and unavailability or interruption of operations.
 *
 *  DISCLAIMER OF LIABILITY
 *  NEITHER RECIPIENT NOR ANY CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY
 *  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING WITHOUT LIMITATION LOST PROFITS), 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 OR DISTRIBUTION OF THE PROGRAM OR THE EXERCISE OF ANY RIGHTS GRANTED
 *  HEREUNDER, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES
 *
 *  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 "esas2r.h"

/* Local function prototypes */
static void esas2r_doorbell_interrupt(struct esas2r_adapter *a, u32 doorbell);
static void esas2r_get_outbound_responses(struct esas2r_adapter *a);
static void esas2r_process_bus_reset(struct esas2r_adapter *a);

/*
 * Poll the adapter for interrupts and service them.
 * This function handles both legacy interrupts and MSI.
 */
void esas2r_polled_interrupt(struct esas2r_adapter *a)
{
        u32 intstat;
        u32 doorbell;

        esas2r_disable_chip_interrupts(a);

        intstat = esas2r_read_register_dword(a, MU_INT_STATUS_OUT);

        if (intstat & MU_INTSTAT_POST_OUT) {
                /* clear the interrupt */

                esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
                                            MU_OLIS_INT);
                esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);

                esas2r_get_outbound_responses(a);
        }

        if (intstat & MU_INTSTAT_DRBL) {
                doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
                if (doorbell != 0)
                        esas2r_doorbell_interrupt(a, doorbell);
        }

        esas2r_enable_chip_interrupts(a);

        if (atomic_read(&a->disable_cnt) == 0)
                esas2r_do_deferred_processes(a);
}

/*
 * Legacy and MSI interrupt handlers.  Note that the legacy interrupt handler
 * schedules a TASKLET to process events, whereas the MSI handler just
 * processes interrupt events directly.
 */
irqreturn_t esas2r_interrupt(int irq, void *dev_id)
{
        struct esas2r_adapter *a = (struct esas2r_adapter *)dev_id;

        if (!esas2r_adapter_interrupt_pending(a))
                return IRQ_NONE;

        set_bit(AF2_INT_PENDING, &a->flags2);
        esas2r_schedule_tasklet(a);

        return IRQ_HANDLED;
}

void esas2r_adapter_interrupt(struct esas2r_adapter *a)
{
        u32 doorbell;

        if (likely(a->int_stat & MU_INTSTAT_POST_OUT)) {
                /* clear the interrupt */
                esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
                                            MU_OLIS_INT);
                esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);
                esas2r_get_outbound_responses(a);
        }

        if (unlikely(a->int_stat & MU_INTSTAT_DRBL)) {
                doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
                if (doorbell != 0)
                        esas2r_doorbell_interrupt(a, doorbell);
        }

        a->int_mask = ESAS2R_INT_STS_MASK;

        esas2r_enable_chip_interrupts(a);

        if (likely(atomic_read(&a->disable_cnt) == 0))
                esas2r_do_deferred_processes(a);
}

irqreturn_t esas2r_msi_interrupt(int irq, void *dev_id)
{
        struct esas2r_adapter *a = (struct esas2r_adapter *)dev_id;
        u32 intstat;
        u32 doorbell;

        intstat = esas2r_read_register_dword(a, MU_INT_STATUS_OUT);

        if (likely(intstat & MU_INTSTAT_POST_OUT)) {
                /* clear the interrupt */

                esas2r_write_register_dword(a, MU_OUT_LIST_INT_STAT,
                                            MU_OLIS_INT);
                esas2r_flush_register_dword(a, MU_OUT_LIST_INT_STAT);

                esas2r_get_outbound_responses(a);
        }

        if (unlikely(intstat & MU_INTSTAT_DRBL)) {
                doorbell = esas2r_read_register_dword(a, MU_DOORBELL_OUT);
                if (doorbell != 0)
                        esas2r_doorbell_interrupt(a, doorbell);
        }

        /*
         * Work around a chip bug and force a new MSI to be sent if one is
         * still pending.
         */
        esas2r_disable_chip_interrupts(a);
        esas2r_enable_chip_interrupts(a);

        if (likely(atomic_read(&a->disable_cnt) == 0))
                esas2r_do_deferred_processes(a);

        esas2r_do_tasklet_tasks(a);

        return 1;
}



static void esas2r_handle_outbound_rsp_err(struct esas2r_adapter *a,
                                           struct esas2r_request *rq,
                                           struct atto_vda_ob_rsp *rsp)
{

        /*
         * For I/O requests, only copy the response if an error
         * occurred and setup a callback to do error processing.
         */
        if (unlikely(rq->req_stat != RS_SUCCESS)) {
                memcpy(&rq->func_rsp, &rsp->func_rsp, sizeof(rsp->func_rsp));

                if (rq->req_stat == RS_ABORTED) {
                        if (rq->timeout > RQ_MAX_TIMEOUT)
                                rq->req_stat = RS_TIMEOUT;
                } else if (rq->req_stat == RS_SCSI_ERROR) {
                        u8 scsistatus = rq->func_rsp.scsi_rsp.scsi_stat;

                        esas2r_trace("scsistatus: %x", scsistatus);

                        /* Any of these are a good result. */
                        if (scsistatus == SAM_STAT_GOOD || scsistatus ==
                            SAM_STAT_CONDITION_MET || scsistatus ==
                            SAM_STAT_INTERMEDIATE || scsistatus ==
                            SAM_STAT_INTERMEDIATE_CONDITION_MET) {
                                rq->req_stat = RS_SUCCESS;
                                rq->func_rsp.scsi_rsp.scsi_stat =
                                        SAM_STAT_GOOD;
                        }
                }
        }
}

static void esas2r_get_outbound_responses(struct esas2r_adapter *a)
{
        struct atto_vda_ob_rsp *rsp;
        u32 rspput_ptr;
        u32 rspget_ptr;
        struct esas2r_request *rq;
        u32 handle;
        unsigned long flags;

        LIST_HEAD(comp_list);

        esas2r_trace_enter();

        spin_lock_irqsave(&a->queue_lock, flags);

        /* Get the outbound limit and pointers */
        rspput_ptr = le32_to_cpu(*a->outbound_copy) & MU_OLC_WRT_PTR;
        rspget_ptr = a->last_read;

        esas2r_trace("rspput_ptr: %x, rspget_ptr: %x", rspput_ptr, rspget_ptr);

        /* If we don't have anything to process, get out */
        if (unlikely(rspget_ptr == rspput_ptr)) {
                spin_unlock_irqrestore(&a->queue_lock, flags);
                esas2r_trace_exit();
                return;
        }

        /* Make sure the firmware is healthy */
        if (unlikely(rspput_ptr >= a->list_size)) {
                spin_unlock_irqrestore(&a->queue_lock, flags);
                esas2r_bugon();
                esas2r_local_reset_adapter(a);
                esas2r_trace_exit();
                return;
        }

        do {
                rspget_ptr++;

                if (rspget_ptr >= a->list_size)
                        rspget_ptr = 0;

                rsp = (struct atto_vda_ob_rsp *)a->outbound_list_md.virt_addr
                      + rspget_ptr;

                handle = rsp->handle;

                /* Verify the handle range */
                if (unlikely(LOWORD(handle) == 0
                             || LOWORD(handle) > num_requests +
                             num_ae_requests + 1)) {
                        esas2r_bugon();
                        continue;
                }

                /* Get the request for this handle */
                rq = a->req_table[LOWORD(handle)];

                if (unlikely(rq == NULL || rq->vrq->scsi.handle != handle)) {
                        esas2r_bugon();
                        continue;
                }

                list_del(&rq->req_list);

                /* Get the completion status */
                rq->req_stat = rsp->req_stat;

                esas2r_trace("handle: %x", handle);
                esas2r_trace("rq: %p", rq);
                esas2r_trace("req_status: %x", rq->req_stat);

                if (likely(rq->vrq->scsi.function == VDA_FUNC_SCSI)) {
                        esas2r_handle_outbound_rsp_err(a, rq, rsp);
                } else {
                        /*
                         * Copy the outbound completion struct for non-I/O
                         * requests.
                         */
                        memcpy(&rq->func_rsp, &rsp->func_rsp,
                               sizeof(rsp->func_rsp));
                }

                /* Queue the request for completion. */
                list_add_tail(&rq->comp_list, &comp_list);

        } while (rspget_ptr != rspput_ptr);

        a->last_read = rspget_ptr;
        spin_unlock_irqrestore(&a->queue_lock, flags);

        esas2r_comp_list_drain(a, &comp_list);
        esas2r_trace_exit();
}

/*
 * Perform all deferred processes for the adapter.  Deferred
 * processes can only be done while the current interrupt
 * disable_cnt for the adapter is zero.
 */
void esas2r_do_deferred_processes(struct esas2r_adapter *a)
{
        int startreqs = 2;
        struct esas2r_request *rq;
        unsigned long flags;

        /*
         * startreqs is used to control starting requests
         * that are on the deferred queue
         *  = 0 - do not start any requests
         *  = 1 - can start discovery requests
         *  = 2 - can start any request
         */

        if (test_bit(AF_CHPRST_PENDING, &a->flags) ||
            test_bit(AF_FLASHING, &a->flags))
                startreqs = 0;
        else if (test_bit(AF_DISC_PENDING, &a->flags))
                startreqs = 1;

        atomic_inc(&a->disable_cnt);

        /* Clear off the completed list to be processed later. */

        if (esas2r_is_tasklet_pending(a)) {
                esas2r_schedule_tasklet(a);

                startreqs = 0;
        }

        /*
         * If we can start requests then traverse the defer queue
         * looking for requests to start or complete
         */
        if (startreqs && !list_empty(&a->defer_list)) {
                LIST_HEAD(comp_list);
                struct list_head *element, *next;

                spin_lock_irqsave(&a->queue_lock, flags);

                list_for_each_safe(element, next, &a->defer_list) {
                        rq = list_entry(element, struct esas2r_request,
                                        req_list);

                        if (rq->req_stat != RS_PENDING) {
                                list_del(element);
                                list_add_tail(&rq->comp_list, &comp_list);
                        }
                        /*
                         * Process discovery and OS requests separately.  We
                         * can't hold up discovery requests when discovery is
                         * pending.  In general, there may be different sets of
                         * conditions for starting different types of requests.
                         */
                        else if (rq->req_type == RT_DISC_REQ) {
                                list_del(element);
                                esas2r_disc_local_start_request(a, rq);
                        } else if (startreqs == 2) {
                                list_del(element);
                                esas2r_local_start_request(a, rq);

                                /*
                                 * Flashing could have been set by last local
                                 * start
                                 */
                                if (test_bit(AF_FLASHING, &a->flags))
                                        break;
                        }
                }

                spin_unlock_irqrestore(&a->queue_lock, flags);
                esas2r_comp_list_drain(a, &comp_list);
        }

        atomic_dec(&a->disable_cnt);
}

/*
 * Process an adapter reset (or one that is about to happen)
 * by making sure all outstanding requests are completed that
 * haven't been already.
 */
void esas2r_process_adapter_reset(struct esas2r_adapter *a)
{
        struct esas2r_request *rq = &a->general_req;
        unsigned long flags;
        struct esas2r_disc_context *dc;

        LIST_HEAD(comp_list);
        struct list_head *element;

        esas2r_trace_enter();

        spin_lock_irqsave(&a->queue_lock, flags);

        /* abort the active discovery, if any.   */

        if (rq->interrupt_cx) {
                dc = (struct esas2r_disc_context *)rq->interrupt_cx;

                dc->disc_evt = 0;

                clear_bit(AF_DISC_IN_PROG, &a->flags);
        }

        /*
         * just clear the interrupt callback for now.  it will be dequeued if
         * and when we find it on the active queue and we don't want the
         * callback called.  also set the dummy completion callback in case we
         * were doing an I/O request.
         */

        rq->interrupt_cx = NULL;
        rq->interrupt_cb = NULL;

        rq->comp_cb = esas2r_dummy_complete;

        /* Reset the read and write pointers */

        *a->outbound_copy =
                a->last_write =
                        a->last_read = a->list_size - 1;

        set_bit(AF_COMM_LIST_TOGGLE, &a->flags);

        /* Kill all the requests on the active list */
        list_for_each(element, &a->defer_list) {
                rq = list_entry(element, struct esas2r_request, req_list);

                if (rq->req_stat == RS_STARTED)
                        if (esas2r_ioreq_aborted(a, rq, RS_ABORTED))
                                list_add_tail(&rq->comp_list, &comp_list);
        }

        spin_unlock_irqrestore(&a->queue_lock, flags);
        esas2r_comp_list_drain(a, &comp_list);
        esas2r_process_bus_reset(a);
        esas2r_trace_exit();
}

static void esas2r_process_bus_reset(struct esas2r_adapter *a)
{
        struct esas2r_request *rq;
        struct list_head *element;
        unsigned long flags;

        LIST_HEAD(comp_list);

        esas2r_trace_enter();

        esas2r_hdebug("reset detected");

        spin_lock_irqsave(&a->queue_lock, flags);

        /* kill all the requests on the deferred queue */
        list_for_each(element, &a->defer_list) {
                rq = list_entry(element, struct esas2r_request, req_list);
                if (esas2r_ioreq_aborted(a, rq, RS_ABORTED))
                        list_add_tail(&rq->comp_list, &comp_list);
        }

        spin_unlock_irqrestore(&a->queue_lock, flags);

        esas2r_comp_list_drain(a, &comp_list);

        if (atomic_read(&a->disable_cnt) == 0)
                esas2r_do_deferred_processes(a);

        clear_bit(AF_OS_RESET, &a->flags);

        esas2r_trace_exit();
}

static void esas2r_chip_rst_needed_during_tasklet(struct esas2r_adapter *a)
{

        clear_bit(AF_CHPRST_NEEDED, &a->flags);
        clear_bit(AF_BUSRST_NEEDED, &a->flags);
        clear_bit(AF_BUSRST_DETECTED, &a->flags);
        clear_bit(AF_BUSRST_PENDING, &a->flags);
        /*
         * Make sure we don't get attempt more than 3 resets
         * when the uptime between resets does not exceed one
         * minute.  This will stop any situation where there is
         * really something wrong with the hardware.  The way
         * this works is that we start with uptime ticks at 0.
         * Each time we do a reset, we add 20 seconds worth to
         * the count.  Each time a timer tick occurs, as long
         * as a chip reset is not pending, we decrement the
         * tick count.  If the uptime ticks ever gets to 60
         * seconds worth, we disable the adapter from that
         * point forward.  Three strikes, you're out.
         */
        if (!esas2r_is_adapter_present(a) || (a->chip_uptime >=
                                              ESAS2R_CHP_UPTIME_MAX)) {
                esas2r_hdebug("*** adapter disabled ***");

                /*
                 * Ok, some kind of hard failure.  Make sure we
                 * exit this loop with chip interrupts
                 * permanently disabled so we don't lock up the
                 * entire system.  Also flag degraded mode to
                 * prevent the heartbeat from trying to recover.
                 */

                set_bit(AF_DEGRADED_MODE, &a->flags);
                set_bit(AF_DISABLED, &a->flags);
                clear_bit(AF_CHPRST_PENDING, &a->flags);
                clear_bit(AF_DISC_PENDING, &a->flags);

                esas2r_disable_chip_interrupts(a);
                a->int_mask = 0;
                esas2r_process_adapter_reset(a);

                esas2r_log(ESAS2R_LOG_CRIT,
                           "Adapter disabled because of hardware failure");
        } else {
                bool alrdyrst = test_and_set_bit(AF_CHPRST_STARTED, &a->flags);

                if (!alrdyrst)
                        /*
                         * Only disable interrupts if this is
                         * the first reset attempt.
                         */
                        esas2r_disable_chip_interrupts(a);

                if ((test_bit(AF_POWER_MGT, &a->flags)) &&
                    !test_bit(AF_FIRST_INIT, &a->flags) && !alrdyrst) {
                        /*
                         * Don't reset the chip on the first
                         * deferred power up attempt.
                         */
                } else {
                        esas2r_hdebug("*** resetting chip ***");
                        esas2r_reset_chip(a);
                }

                /* Kick off the reinitialization */
                a->chip_uptime += ESAS2R_CHP_UPTIME_CNT;
                a->chip_init_time = jiffies_to_msecs(jiffies);
                if (!test_bit(AF_POWER_MGT, &a->flags)) {
                        esas2r_process_adapter_reset(a);

                        if (!alrdyrst) {
                                /* Remove devices now that I/O is cleaned up. */
                                a->prev_dev_cnt =
                                        esas2r_targ_db_get_tgt_cnt(a);
                                esas2r_targ_db_remove_all(a, false);
                        }
                }

                a->int_mask = 0;
        }
}

static void esas2r_handle_chip_rst_during_tasklet(struct esas2r_adapter *a)
{
        while (test_bit(AF_CHPRST_DETECTED, &a->flags)) {
                /*
                 * Balance the enable in esas2r_initadapter_hw.
                 * Esas2r_power_down already took care of it for power
                 * management.
                 */
                if (!test_bit(AF_DEGRADED_MODE, &a->flags) &&
                    !test_bit(AF_POWER_MGT, &a->flags))
                        esas2r_disable_chip_interrupts(a);

                /* Reinitialize the chip. */
                esas2r_check_adapter(a);
                esas2r_init_adapter_hw(a, 0);

                if (test_bit(AF_CHPRST_NEEDED, &a->flags))
                        break;

                if (test_bit(AF_POWER_MGT, &a->flags)) {
                        /* Recovery from power management. */
                        if (test_bit(AF_FIRST_INIT, &a->flags)) {
                                /* Chip reset during normal power up */
                                esas2r_log(ESAS2R_LOG_CRIT,
                                           "The firmware was reset during a normal power-up sequence");
                        } else {
                                /* Deferred power up complete. */
                                clear_bit(AF_POWER_MGT, &a->flags);
                                esas2r_send_reset_ae(a, true);
                        }
                } else {
                        /* Recovery from online chip reset. */
                        if (test_bit(AF_FIRST_INIT, &a->flags)) {
                                /* Chip reset during driver load */
                        } else {
                                /* Chip reset after driver load */
                                esas2r_send_reset_ae(a, false);
                        }

                        esas2r_log(ESAS2R_LOG_CRIT,
                                   "Recovering from a chip reset while the chip was online");
                }

                clear_bit(AF_CHPRST_STARTED, &a->flags);
                esas2r_enable_chip_interrupts(a);

                /*
                 * Clear this flag last!  this indicates that the chip has been
                 * reset already during initialization.
                 */
                clear_bit(AF_CHPRST_DETECTED, &a->flags);
        }
}


/* Perform deferred tasks when chip interrupts are disabled */
void esas2r_do_tasklet_tasks(struct esas2r_adapter *a)
{

        if (test_bit(AF_CHPRST_NEEDED, &a->flags) ||
            test_bit(AF_CHPRST_DETECTED, &a->flags)) {
                if (test_bit(AF_CHPRST_NEEDED, &a->flags))
                        esas2r_chip_rst_needed_during_tasklet(a);

                esas2r_handle_chip_rst_during_tasklet(a);
        }

        if (test_bit(AF_BUSRST_NEEDED, &a->flags)) {
                esas2r_hdebug("hard resetting bus");

                clear_bit(AF_BUSRST_NEEDED, &a->flags);

                if (test_bit(AF_FLASHING, &a->flags))
                        set_bit(AF_BUSRST_DETECTED, &a->flags);
                else
                        esas2r_write_register_dword(a, MU_DOORBELL_IN,
                                                    DRBL_RESET_BUS);
        }

        if (test_bit(AF_BUSRST_DETECTED, &a->flags)) {
                esas2r_process_bus_reset(a);

                esas2r_log_dev(ESAS2R_LOG_WARN,
                               &(a->host->shost_gendev),
                               "scsi_report_bus_reset() called");

                scsi_report_bus_reset(a->host, 0);

                clear_bit(AF_BUSRST_DETECTED, &a->flags);
                clear_bit(AF_BUSRST_PENDING, &a->flags);

                esas2r_log(ESAS2R_LOG_WARN, "Bus reset complete");
        }

        if (test_bit(AF_PORT_CHANGE, &a->flags)) {
                clear_bit(AF_PORT_CHANGE, &a->flags);

                esas2r_targ_db_report_changes(a);
        }

        if (atomic_read(&a->disable_cnt) == 0)
                esas2r_do_deferred_processes(a);
}

static void esas2r_doorbell_interrupt(struct esas2r_adapter *a, u32 doorbell)
{
        if (!(doorbell & DRBL_FORCE_INT)) {
                esas2r_trace_enter();
                esas2r_trace("doorbell: %x", doorbell);
        }

        /* First clear the doorbell bits */
        esas2r_write_register_dword(a, MU_DOORBELL_OUT, doorbell);

        if (doorbell & DRBL_RESET_BUS)
                set_bit(AF_BUSRST_DETECTED, &a->flags);

        if (doorbell & DRBL_FORCE_INT)
                clear_bit(AF_HEARTBEAT, &a->flags);

        if (doorbell & DRBL_PANIC_REASON_MASK) {
                esas2r_hdebug("*** Firmware Panic ***");
                esas2r_log(ESAS2R_LOG_CRIT, "The firmware has panicked");
        }

        if (doorbell & DRBL_FW_RESET) {
                set_bit(AF2_COREDUMP_AVAIL, &a->flags2);
                esas2r_local_reset_adapter(a);
        }

        if (!(doorbell & DRBL_FORCE_INT))
                esas2r_trace_exit();
}

void esas2r_force_interrupt(struct esas2r_adapter *a)
{
        esas2r_write_register_dword(a, MU_DOORBELL_IN, DRBL_FORCE_INT |
                                    DRBL_DRV_VER);
}


static void esas2r_lun_event(struct esas2r_adapter *a, union atto_vda_ae *ae,
                             u16 target, u32 length)
{
        struct esas2r_target *t = a->targetdb + target;
        u32 cplen = length;
        unsigned long flags;

        if (cplen > sizeof(t->lu_event))
                cplen = sizeof(t->lu_event);

        esas2r_trace("ae->lu.dwevent: %x", ae->lu.dwevent);
        esas2r_trace("ae->lu.bystate: %x", ae->lu.bystate);

        spin_lock_irqsave(&a->mem_lock, flags);

        t->new_target_state = TS_INVALID;

        if (ae->lu.dwevent  & VDAAE_LU_LOST) {
                t->new_target_state = TS_NOT_PRESENT;
        } else {
                switch (ae->lu.bystate) {
                case VDAAE_LU_NOT_PRESENT:
                case VDAAE_LU_OFFLINE:
                case VDAAE_LU_DELETED:
                case VDAAE_LU_FACTORY_DISABLED:
                        t->new_target_state = TS_NOT_PRESENT;
                        break;

                case VDAAE_LU_ONLINE:
                case VDAAE_LU_DEGRADED:
                        t->new_target_state = TS_PRESENT;
                        break;
                }
        }

        if (t->new_target_state != TS_INVALID) {
                memcpy(&t->lu_event, &ae->lu, cplen);

                esas2r_disc_queue_event(a, DCDE_DEV_CHANGE);
        }

        spin_unlock_irqrestore(&a->mem_lock, flags);
}



void esas2r_ae_complete(struct esas2r_adapter *a, struct esas2r_request *rq)
{
        union atto_vda_ae *ae =
                (union atto_vda_ae *)rq->vda_rsp_data->ae_data.event_data;
        u32 length = le32_to_cpu(rq->func_rsp.ae_rsp.length);
        union atto_vda_ae *last =
                (union atto_vda_ae *)(rq->vda_rsp_data->ae_data.event_data
                                      + length);

        esas2r_trace_enter();
        esas2r_trace("length: %d", length);

        if (length > sizeof(struct atto_vda_ae_data)
            || (length & 3) != 0
            || length == 0) {
                esas2r_log(ESAS2R_LOG_WARN,
                           "The AE request response length (%p) is too long: %d",
                           rq, length);

                esas2r_hdebug("aereq->length (0x%x) too long", length);
                esas2r_bugon();

                last = ae;
        }

        while (ae < last) {
                u16 target;

                esas2r_trace("ae: %p", ae);
                esas2r_trace("ae->hdr: %p", &(ae->hdr));

                length = ae->hdr.bylength;

                if (length > (u32)((u8 *)last - (u8 *)ae)
                    || (length & 3) != 0
                    || length == 0) {
                        esas2r_log(ESAS2R_LOG_CRIT,
                                   "the async event length is invalid (%p): %d",
                                   ae, length);

                        esas2r_hdebug("ae->hdr.length (0x%x) invalid", length);
                        esas2r_bugon();

                        break;
                }

                esas2r_nuxi_ae_data(ae);

                esas2r_queue_fw_event(a, fw_event_vda_ae, ae,
                                      sizeof(union atto_vda_ae));

                switch (ae->hdr.bytype) {
                case VDAAE_HDR_TYPE_RAID:

                        if (ae->raid.dwflags & (VDAAE_GROUP_STATE
                                                | VDAAE_RBLD_STATE
                                                | VDAAE_MEMBER_CHG
                                                | VDAAE_PART_CHG)) {
                                esas2r_log(ESAS2R_LOG_INFO,
                                           "RAID event received - name:%s rebuild_state:%d group_state:%d",
                                           ae->raid.acname,
                                           ae->raid.byrebuild_state,
                                           ae->raid.bygroup_state);
                        }

                        break;

                case VDAAE_HDR_TYPE_LU:
                        esas2r_log(ESAS2R_LOG_INFO,
                                   "LUN event received: event:%d target_id:%d LUN:%d state:%d",
                                   ae->lu.dwevent,
                                   ae->lu.id.tgtlun.wtarget_id,
                                   ae->lu.id.tgtlun.bylun,
                                   ae->lu.bystate);

                        target = ae->lu.id.tgtlun.wtarget_id;

                        if (target < ESAS2R_MAX_TARGETS)
                                esas2r_lun_event(a, ae, target, length);

                        break;

                case VDAAE_HDR_TYPE_DISK:
                        esas2r_log(ESAS2R_LOG_INFO, "Disk event received");
                        break;

                default:

                        /* Silently ignore the rest and let the apps deal with
                         * them.
                         */

                        break;
                }

                ae = (union atto_vda_ae *)((u8 *)ae + length);
        }

        /* Now requeue it. */
        esas2r_start_ae_request(a, rq);
        esas2r_trace_exit();
}

/* Send an asynchronous event for a chip reset or power management. */
void esas2r_send_reset_ae(struct esas2r_adapter *a, bool pwr_mgt)
{
        struct atto_vda_ae_hdr ae;

        if (pwr_mgt)
                ae.bytype = VDAAE_HDR_TYPE_PWRMGT;
        else
                ae.bytype = VDAAE_HDR_TYPE_RESET;

        ae.byversion = VDAAE_HDR_VER_0;
        ae.byflags = 0;
        ae.bylength = (u8)sizeof(struct atto_vda_ae_hdr);

        if (pwr_mgt)
                esas2r_hdebug("*** sending power management AE ***");
        else
                esas2r_hdebug("*** sending reset AE ***");

        esas2r_queue_fw_event(a, fw_event_vda_ae, &ae,
                              sizeof(union atto_vda_ae));
}

void esas2r_dummy_complete(struct esas2r_adapter *a, struct esas2r_request *rq)
{}

static void esas2r_check_req_rsp_sense(struct esas2r_adapter *a,
                                       struct esas2r_request *rq)
{
        u8 snslen, snslen2;

        snslen = snslen2 = rq->func_rsp.scsi_rsp.sense_len;

        if (snslen > rq->sense_len)
                snslen = rq->sense_len;

        if (snslen) {
                if (rq->sense_buf)
                        memcpy(rq->sense_buf, rq->data_buf, snslen);
                else
                        rq->sense_buf = (u8 *)rq->data_buf;

                /* See about possible sense data */
                if (snslen2 > 0x0c) {
                        u8 *s = (u8 *)rq->data_buf;

                        esas2r_trace_enter();

                        /* Report LUNS data has changed */
                        if (s[0x0c] == 0x3f && s[0x0d] == 0x0E) {
                                esas2r_trace("rq->target_id: %d",
                                             rq->target_id);
                                esas2r_target_state_changed(a, rq->target_id,
                                                            TS_LUN_CHANGE);
                        }

                        esas2r_trace("add_sense_key=%x", s[0x0c]);
                        esas2r_trace("add_sense_qual=%x", s[0x0d]);
                        esas2r_trace_exit();
                }
        }

        rq->sense_len = snslen;
}


void esas2r_complete_request(struct esas2r_adapter *a,
                             struct esas2r_request *rq)
{
        if (rq->vrq->scsi.function == VDA_FUNC_FLASH
            && rq->vrq->flash.sub_func == VDA_FLASH_COMMIT)
                clear_bit(AF_FLASHING, &a->flags);

        /* See if we setup a callback to do special processing */

        if (rq->interrupt_cb) {
                (*rq->interrupt_cb)(a, rq);

                if (rq->req_stat == RS_PENDING) {
                        esas2r_start_request(a, rq);
                        return;
                }
        }

        if (likely(rq->vrq->scsi.function == VDA_FUNC_SCSI)
            && unlikely(rq->req_stat != RS_SUCCESS)) {
                esas2r_check_req_rsp_sense(a, rq);
                esas2r_log_request_failure(a, rq);
        }

        (*rq->comp_cb)(a, rq);
}