dpcsup.c

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/*
 *  Adaptec AAC series RAID controller driver
 *  (c) Copyright 2001 Red Hat Inc.
 *
 * based on the old aacraid driver that is..
 * Adaptec aacraid device driver for Linux.
 *
 * Copyright (c) 2000-2010 Adaptec, Inc.
 *               2010 PMC-Sierra, Inc. ([email protected])
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Module Name:
 *  dpcsup.c
 *
 * Abstract: All DPC processing routines for the cyclone board occur here.
 *
 *
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/completion.h>
#include <linux/blkdev.h>
#include <linux/semaphore.h>

#include "aacraid.h"

unsigned int aac_response_normal(struct aac_queue * q)
{
    struct aac_dev * dev = q->dev;
    struct aac_entry *entry;
    struct hw_fib * hwfib;
    struct fib * fib;
    int consumed = 0;
    unsigned long flags, mflags;

    spin_lock_irqsave(q->lock, flags);
    /*
     *  Keep pulling response QEs off the response queue and waking
     *  up the waiters until there are no more QEs. We then return
     *  back to the system. If no response was requesed we just
     *  deallocate the Fib here and continue.
     */
    while(aac_consumer_get(dev, q, &entry))
    {
        int fast;
        u32 index = le32_to_cpu(entry->addr);
        fast = index & 0x01;
        fib = &dev->fibs[index >> 2];
        hwfib = fib->hw_fib_va;
        
        aac_consumer_free(dev, q, HostNormRespQueue);
        /*
         *  Remove this fib from the Outstanding I/O queue.
         *  But only if it has not already been timed out.
         *
         *  If the fib has been timed out already, then just 
         *  continue. The caller has already been notified that
         *  the fib timed out.
         */
        dev->queues->queue[AdapNormCmdQueue].numpending--;

        if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
            spin_unlock_irqrestore(q->lock, flags);
            aac_fib_complete(fib);
            aac_fib_free(fib);
            spin_lock_irqsave(q->lock, flags);
            continue;
        }
        spin_unlock_irqrestore(q->lock, flags);

        if (fast) {
            /*
             *  Doctor the fib
             */
            *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
            hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
            fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
        }

        FIB_COUNTER_INCREMENT(aac_config.FibRecved);

        if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
        {
            __le32 *pstatus = (__le32 *)hwfib->data;
            if (*pstatus & cpu_to_le32(0xffff0000))
                *pstatus = cpu_to_le32(ST_OK);
        }
        if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 
        {
                if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
                FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
            else 
                FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
            /*
             *  NOTE:  we cannot touch the fib after this
             *      call, because it may have been deallocated.
             */
            fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
            fib->callback(fib->callback_data, fib);
        } else {
            unsigned long flagv;
            spin_lock_irqsave(&fib->event_lock, flagv);
            if (!fib->done) {
                fib->done = 1;
                up(&fib->event_wait);
            }
            spin_unlock_irqrestore(&fib->event_lock, flagv);

            spin_lock_irqsave(&dev->manage_lock, mflags);
            dev->management_fib_count--;
            spin_unlock_irqrestore(&dev->manage_lock, mflags);

            FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
            if (fib->done == 2) {
                spin_lock_irqsave(&fib->event_lock, flagv);
                fib->done = 0;
                spin_unlock_irqrestore(&fib->event_lock, flagv);
                aac_fib_complete(fib);
                aac_fib_free(fib);
            }
        }
        consumed++;
        spin_lock_irqsave(q->lock, flags);
    }

    if (consumed > aac_config.peak_fibs)
        aac_config.peak_fibs = consumed;
    if (consumed == 0) 
        aac_config.zero_fibs++;

    spin_unlock_irqrestore(q->lock, flags);
    return 0;
}


unsigned int aac_command_normal(struct aac_queue *q)
{
    struct aac_dev * dev = q->dev;
    struct aac_entry *entry;
    unsigned long flags;

    spin_lock_irqsave(q->lock, flags);

    /*
     *  Keep pulling response QEs off the response queue and waking
     *  up the waiters until there are no more QEs. We then return
     *  back to the system.
     */
    while(aac_consumer_get(dev, q, &entry))
    {
        struct fib fibctx;
        struct hw_fib * hw_fib;
        u32 index;
        struct fib *fib = &fibctx;
        
        index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
        hw_fib = &dev->aif_base_va[index];
        
        /*
         *  Allocate a FIB at all costs. For non queued stuff
         *  we can just use the stack so we are happy. We need
         *  a fib object in order to manage the linked lists
         */
        if (dev->aif_thread)
            if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
                fib = &fibctx;
        
        memset(fib, 0, sizeof(struct fib));
        INIT_LIST_HEAD(&fib->fiblink);
        fib->type = FSAFS_NTC_FIB_CONTEXT;
        fib->size = sizeof(struct fib);
        fib->hw_fib_va = hw_fib;
        fib->data = hw_fib->data;
        fib->dev = dev;
        
                
        if (dev->aif_thread && fib != &fibctx) {
                list_add_tail(&fib->fiblink, &q->cmdq);
                aac_consumer_free(dev, q, HostNormCmdQueue);
                wake_up_interruptible(&q->cmdready);
        } else {
                aac_consumer_free(dev, q, HostNormCmdQueue);
            spin_unlock_irqrestore(q->lock, flags);
            /*
             *  Set the status of this FIB
             */
            *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
            aac_fib_adapter_complete(fib, sizeof(u32));
            spin_lock_irqsave(q->lock, flags);
        }       
    }
    spin_unlock_irqrestore(q->lock, flags);
    return 0;
}

/*
 *
 * aac_aif_callback
 * @context: the context set in the fib - here it is scsi cmd
 * @fibptr: pointer to the fib
 *
 * Handles the AIFs - new method (SRC)
 *
 */

static void aac_aif_callback(void *context, struct fib * fibptr)
{
    struct fib *fibctx;
    struct aac_dev *dev;
    struct aac_aifcmd *cmd;
    int status;

    fibctx = (struct fib *)context;
    BUG_ON(fibptr == NULL);
    dev = fibptr->dev;

    if (fibptr->hw_fib_va->header.XferState &
        cpu_to_le32(NoMoreAifDataAvailable)) {
        aac_fib_complete(fibptr);
        aac_fib_free(fibptr);
        return;
    }

    aac_intr_normal(dev, 0, 1, 0, fibptr->hw_fib_va);

    aac_fib_init(fibctx);
    cmd = (struct aac_aifcmd *) fib_data(fibctx);
    cmd->command = cpu_to_le32(AifReqEvent);

    status = aac_fib_send(AifRequest,
        fibctx,
        sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
        FsaNormal,
        0, 1,
        (fib_callback)aac_aif_callback, fibctx);
}


unsigned int aac_intr_normal(struct aac_dev *dev, u32 index,
            int isAif, int isFastResponse, struct hw_fib *aif_fib)
{
    unsigned long mflags;
    dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
    if (isAif == 1) {   /* AIF - common */
        struct hw_fib * hw_fib;
        struct fib * fib;
        struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
        unsigned long flags;

        /*
         *  Allocate a FIB. For non queued stuff we can just use
         * the stack so we are happy. We need a fib object in order to
         * manage the linked lists.
         */
        if ((!dev->aif_thread)
         || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
            return 1;
        if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
            kfree (fib);
            return 1;
        }
        if (aif_fib != NULL) {
            memcpy(hw_fib, aif_fib, sizeof(struct hw_fib));
        } else {
            memcpy(hw_fib,
                (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
                index), sizeof(struct hw_fib));
        }
        INIT_LIST_HEAD(&fib->fiblink);
        fib->type = FSAFS_NTC_FIB_CONTEXT;
        fib->size = sizeof(struct fib);
        fib->hw_fib_va = hw_fib;
        fib->data = hw_fib->data;
        fib->dev = dev;
    
        spin_lock_irqsave(q->lock, flags);
        list_add_tail(&fib->fiblink, &q->cmdq);
            wake_up_interruptible(&q->cmdready);
        spin_unlock_irqrestore(q->lock, flags);
        return 1;
    } else if (isAif == 2) {    /* AIF - new (SRC) */
        struct fib *fibctx;
        struct aac_aifcmd *cmd;

        fibctx = aac_fib_alloc(dev);
        if (!fibctx)
            return 1;
        aac_fib_init(fibctx);

        cmd = (struct aac_aifcmd *) fib_data(fibctx);
        cmd->command = cpu_to_le32(AifReqEvent);

        return aac_fib_send(AifRequest,
            fibctx,
            sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
            FsaNormal,
            0, 1,
            (fib_callback)aac_aif_callback, fibctx);
    } else {
        struct fib *fib = &dev->fibs[index];
        struct hw_fib * hwfib = fib->hw_fib_va;

        /*
         *  Remove this fib from the Outstanding I/O queue.
         *  But only if it has not already been timed out.
         *
         *  If the fib has been timed out already, then just 
         *  continue. The caller has already been notified that
         *  the fib timed out.
         */
        dev->queues->queue[AdapNormCmdQueue].numpending--;

        if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
            aac_fib_complete(fib);
            aac_fib_free(fib);
            return 0;
        }

        if (isFastResponse) {
            /*
             *  Doctor the fib
             */
            *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
            hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
            fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
        }

        FIB_COUNTER_INCREMENT(aac_config.FibRecved);

        if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
        {
            __le32 *pstatus = (__le32 *)hwfib->data;
            if (*pstatus & cpu_to_le32(0xffff0000))
                *pstatus = cpu_to_le32(ST_OK);
        }
        if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async)) 
        {
                if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
                FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
            else 
                FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
            /*
             *  NOTE:  we cannot touch the fib after this
             *      call, because it may have been deallocated.
             */
            fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
            fib->callback(fib->callback_data, fib);
        } else {
            unsigned long flagv;
            dprintk((KERN_INFO "event_wait up\n"));
            spin_lock_irqsave(&fib->event_lock, flagv);
            if (!fib->done) {
                fib->done = 1;
                up(&fib->event_wait);
            }
            spin_unlock_irqrestore(&fib->event_lock, flagv);

            spin_lock_irqsave(&dev->manage_lock, mflags);
            dev->management_fib_count--;
            spin_unlock_irqrestore(&dev->manage_lock, mflags);

            FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
            if (fib->done == 2) {
                spin_lock_irqsave(&fib->event_lock, flagv);
                fib->done = 0;
                spin_unlock_irqrestore(&fib->event_lock, flagv);
                aac_fib_complete(fib);
                aac_fib_free(fib);
            }

        }
        return 0;
    }
}