drivers/scsi/aacraid/dpcsup.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc. <alan@redhat.com>
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000 Adaptec, Inc. (aacraid@adaptec.com)
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2, or (at your option)
  13  * any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; see the file COPYING.  If not, write to
  22  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Module Name:
  25  *  dpcsup.c
  26  *
  27  * Abstract: All DPC processing routines for the cyclone board occur here.
  28  *
  29  *
  30  */
  31
  32 #include <linux/kernel.h>
  33 #include <linux/init.h>
  34 #include <linux/types.h>
  35 #include <linux/sched.h>
  36 #include <linux/pci.h>
  37 #include <linux/spinlock.h>
  38 #include <linux/slab.h>
  39 #include <linux/completion.h>
  40 #include <linux/blkdev.h>
  41 #include <asm/semaphore.h>
  42
  43 #include "aacraid.h"
  44
  45 /**
  46  *      aac_response_normal     -       Handle command replies
  47  *      @q: Queue to read from
  48  *
  49  *      This DPC routine will be run when the adapter interrupts us to let us
  50  *      know there is a response on our normal priority queue. We will pull off
  51  *      all QE there are and wake up all the waiters before exiting. We will
  52  *      take a spinlock out on the queue before operating on it.
  53  */
  54
  55 unsigned int aac_response_normal(struct aac_queue * q)
  56 {
  57         struct aac_dev * dev = q->dev;
  58         struct aac_entry *entry;
  59         struct hw_fib * hwfib;
  60         struct fib * fib;
  61         int consumed = 0;
  62         unsigned long flags;
  63
  64         spin_lock_irqsave(q->lock, flags);
  65         /*
  66          *      Keep pulling response QEs off the response queue and waking
  67          *      up the waiters until there are no more QEs. We then return
  68          *      back to the system. If no response was requesed we just
  69          *      deallocate the Fib here and continue.
  70          */
  71         while(aac_consumer_get(dev, q, &entry))
  72         {
  73                 int fast;
  74                 u32 index = le32_to_cpu(entry->addr);
  75                 fast = index & 0x01;
  76                 fib = &dev->fibs[index >> 1];
  77                 hwfib = fib->hw_fib;
  78
  79                 aac_consumer_free(dev, q, HostNormRespQueue);
  80                 /*
  81                  *      Remove this fib from the Outstanding I/O queue.
  82                  *      But only if it has not already been timed out.
  83                  *
  84                  *      If the fib has been timed out already, then just
  85                  *      continue. The caller has already been notified that
  86                  *      the fib timed out.
  87                  */
  88                 if (!(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
  89                         list_del(&fib->queue);
  90                         dev->queues->queue[AdapNormCmdQueue].numpending--;
  91                 } else {
  92                         printk(KERN_WARNING "aacraid: FIB timeout (%x).\n", fib->flags);
  93                         printk(KERN_DEBUG"aacraid: hwfib=%p fib index=%i fib=%p\n",hwfib, hwfib->header.SenderData,fib);
  94                         continue;
  95                 }
  96                 spin_unlock_irqrestore(q->lock, flags);
  97
  98                 if (fast) {
  99                         /*
 100                          *      Doctor the fib
 101                          */
 102                         *(u32 *)hwfib->data = cpu_to_le32(ST_OK);
 103                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 104                 }
 105
 106                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 107
 108                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 109                 {
 110                         u32 *pstatus = (u32 *)hwfib->data;
 111                         if (*pstatus & cpu_to_le32(0xffff0000))
 112                                 *pstatus = cpu_to_le32(ST_OK);
 113                 }
 114                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 115                 {
 116                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 117                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 118                         else
 119                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 120                         /*
 121                          *      NOTE:  we cannot touch the fib after this
 122                          *          call, because it may have been deallocated.
 123                          */
 124                         fib->callback(fib->callback_data, fib);
 125                 } else {
 126                         unsigned long flagv;
 127                         spin_lock_irqsave(&fib->event_lock, flagv);
 128                         fib->done = 1;
 129                         up(&fib->event_wait);
 130                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 131                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 132                 }
 133                 consumed++;
 134                 spin_lock_irqsave(q->lock, flags);
 135         }
 136
 137         if (consumed > aac_config.peak_fibs)
 138                 aac_config.peak_fibs = consumed;
 139         if (consumed == 0)
 140                 aac_config.zero_fibs++;
 141
 142         spin_unlock_irqrestore(q->lock, flags);
 143         return 0;
 144 }
 145
 146
 147 /**
 148  *      aac_command_normal      -       handle commands
 149  *      @q: queue to process
 150  *
 151  *      This DPC routine will be queued when the adapter interrupts us to
 152  *      let us know there is a command on our normal priority queue. We will
 153  *      pull off all QE there are and wake up all the waiters before exiting.
 154  *      We will take a spinlock out on the queue before operating on it.
 155  */
 156
 157 unsigned int aac_command_normal(struct aac_queue *q)
 158 {
 159         struct aac_dev * dev = q->dev;
 160         struct aac_entry *entry;
 161         unsigned long flags;
 162
 163         spin_lock_irqsave(q->lock, flags);
 164
 165         /*
 166          *      Keep pulling response QEs off the response queue and waking
 167          *      up the waiters until there are no more QEs. We then return
 168          *      back to the system.
 169          */
 170         while(aac_consumer_get(dev, q, &entry))
 171         {
 172                 struct fib fibctx;
 173                 struct hw_fib * hw_fib;
 174                 u32 index;
 175                 struct fib *fib = &fibctx;
 176
 177                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 178                 hw_fib = &dev->aif_base_va[index];
 179
 180                 /*
 181                  *      Allocate a FIB at all costs. For non queued stuff
 182                  *      we can just use the stack so we are happy. We need
 183                  *      a fib object in order to manage the linked lists
 184                  */
 185                 if (dev->aif_thread)
 186                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 187                                 fib = &fibctx;
 188
 189                 memset(fib, 0, sizeof(struct fib));
 190                 INIT_LIST_HEAD(&fib->fiblink);
 191                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 192                 fib->size = sizeof(struct fib);
 193                 fib->hw_fib = hw_fib;
 194                 fib->data = hw_fib->data;
 195                 fib->dev = dev;
 196
 197
 198                 if (dev->aif_thread && fib != &fibctx) {
 199                         list_add_tail(&fib->fiblink, &q->cmdq);
 200                         aac_consumer_free(dev, q, HostNormCmdQueue);
 201                         wake_up_interruptible(&q->cmdready);
 202                 } else {
 203                         aac_consumer_free(dev, q, HostNormCmdQueue);
 204                         spin_unlock_irqrestore(q->lock, flags);
 205                         /*
 206                          *      Set the status of this FIB
 207                          */
 208                         *(u32 *)hw_fib->data = cpu_to_le32(ST_OK);
 209                         fib_adapter_complete(fib, sizeof(u32));
 210                         spin_lock_irqsave(q->lock, flags);
 211                 }
 212         }
 213         spin_unlock_irqrestore(q->lock, flags);
 214         return 0;
 215 }