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/config.h>
  33 #include <linux/kernel.h>
  34 #include <linux/init.h>
  35 #include <linux/types.h>
  36 #include <linux/sched.h>
  37 #include <linux/pci.h>
  38 #include <linux/spinlock.h>
  39 #include <linux/slab.h>
  40 #include <linux/completion.h>
  41 #include <linux/blk.h>
  42 #include <asm/semaphore.h>
  43 #include "scsi.h"
  44 #include "hosts.h"
  45
  46 #include "aacraid.h"
  47
  48 /**
  49  *      aac_response_normal     -       Handle command replies
  50  *      @q: Queue to read from
  51  *
  52  *      This DPC routine will be run when the adapter interrupts us to let us
  53  *      know there is a response on our normal priority queue. We will pull off
  54  *      all QE there are and wake up all the waiters before exiting. We will
  55  *      take a spinlock out on the queue before operating on it.
  56  */
  57
  58 unsigned int aac_response_normal(struct aac_queue * q)
  59 {
  60         struct aac_dev * dev = q->dev;
  61         struct aac_entry *entry;
  62         struct hw_fib * hwfib;
  63         struct fib * fib;
  64         int consumed = 0;
  65         unsigned long flags;
  66
  67         spin_lock_irqsave(q->lock, flags);
  68
  69         /*
  70          *      Keep pulling response QEs off the response queue and waking
  71          *      up the waiters until there are no more QEs. We then return
  72          *      back to the system. If no response was requesed we just
  73          *      deallocate the Fib here and continue.
  74          */
  75         while(aac_consumer_get(dev, q, &entry))
  76         {
  77                 int fast;
  78                 u32 index;
  79                 index = le32_to_cpu(entry->addr);
  80                 fast = index & 0x01;
  81                 fib = &dev->fibs[index >> 1];
  82                 hwfib = fib->hw_fib;
  83
  84                 aac_consumer_free(dev, q, HostNormRespQueue);
  85                 /*
  86                  *      Remove this fib from the Outstanding I/O queue.
  87                  *      But only if it has not already been timed out.
  88                  *
  89                  *      If the fib has been timed out already, then just
  90                  *      continue. The caller has already been notified that
  91                  *      the fib timed out.
  92                  */
  93                 if (!(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
  94                         list_del(&fib->queue);
  95                         dev->queues->queue[AdapNormCmdQueue].numpending--;
  96                 } else {
  97                         printk(KERN_WARNING "aacraid: FIB timeout (%x).\n", fib->flags);
  98                         continue;
  99                 }
 100                 spin_unlock_irqrestore(q->lock, flags);
 101
 102                 if (fast) {
 103                         /*
 104                          *      Doctor the fib
 105                          */
 106                         *(u32 *)hwfib->data = cpu_to_le32(ST_OK);
 107                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 108                 }
 109
 110                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 111
 112                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 113                 {
 114                         u32 *pstatus = (u32 *)hwfib->data;
 115                         if (*pstatus & cpu_to_le32(0xffff0000))
 116                                 *pstatus = cpu_to_le32(ST_OK);
 117                 }
 118                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 119                 {
 120                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 121                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 122                         else
 123                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 124                         /*
 125                          *      NOTE:  we cannot touch the fib after this
 126                          *          call, because it may have been deallocated.
 127                          */
 128                         fib->callback(fib->callback_data, fib);
 129                 } else {
 130                         unsigned long flagv;
 131                         spin_lock_irqsave(&fib->event_lock, flagv);
 132                         fib->done = 1;
 133                         up(&fib->event_wait);
 134                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 135                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 136                 }
 137                 consumed++;
 138                 spin_lock_irqsave(q->lock, flags);
 139         }
 140
 141         if (consumed > aac_config.peak_fibs)
 142                 aac_config.peak_fibs = consumed;
 143         if (consumed == 0)
 144                 aac_config.zero_fibs++;
 145
 146         spin_unlock_irqrestore(q->lock, flags);
 147         return 0;
 148 }
 149
 150
 151 /**
 152  *      aac_command_normal      -       handle commands
 153  *      @q: queue to process
 154  *
 155  *      This DPC routine will be queued when the adapter interrupts us to
 156  *      let us know there is a command on our normal priority queue. We will
 157  *      pull off all QE there are and wake up all the waiters before exiting.
 158  *      We will take a spinlock out on the queue before operating on it.
 159  */
 160
 161 unsigned int aac_command_normal(struct aac_queue *q)
 162 {
 163         struct aac_dev * dev = q->dev;
 164         struct aac_entry *entry;
 165         unsigned long flags;
 166
 167         spin_lock_irqsave(q->lock, flags);
 168
 169         /*
 170          *      Keep pulling response QEs off the response queue and waking
 171          *      up the waiters until there are no more QEs. We then return
 172          *      back to the system.
 173          */
 174         dprintk((KERN_INFO
 175           "dev=%p, dev->comm_phys=%x, dev->comm_addr=%p, dev->comm_size=%u\n",
 176           dev, (u32)dev->comm_phys, dev->comm_addr, (unsigned)dev->comm_size));
 177
 178         while(aac_consumer_get(dev, q, &entry))
 179         {
 180                 struct fib fibctx;
 181                 struct hw_fib * hw_fib;
 182                 u32 index;
 183                 struct fib *fib = &fibctx;
 184
 185                 index = le32_to_cpu(entry->addr / sizeof(struct hw_fib));
 186                 hw_fib = &dev->aif_base_va[index];
 187
 188                 /*
 189                  *      Allocate a FIB at all costs. For non queued stuff
 190                  *      we can just use the stack so we are happy. We need
 191                  *      a fib object in order to manage the linked lists
 192                  */
 193                 if (dev->aif_thread)
 194                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC))==NULL)
 195                                 fib = &fibctx;
 196
 197                 memset(fib, 0, sizeof(struct fib));
 198                 INIT_LIST_HEAD(&fib->fiblink);
 199                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 200                 fib->size = sizeof(struct fib);
 201                 fib->hw_fib = hw_fib;
 202                 fib->data = hw_fib->data;
 203                 fib->dev = dev;
 204
 205                 if (dev->aif_thread && fib != &fibctx)
 206                 {
 207                         list_add_tail(&fib->fiblink, &q->cmdq);
 208                         aac_consumer_free(dev, q, HostNormCmdQueue);
 209                         wake_up_interruptible(&q->cmdready);
 210                 } else {
 211                         aac_consumer_free(dev, q, HostNormCmdQueue);
 212                         spin_unlock_irqrestore(q->lock, flags);
 213                         /*
 214                          *      Set the status of this FIB
 215                          */
 216                         *(u32 *)hw_fib->data = cpu_to_le32(ST_OK);
 217                         fib_adapter_complete(fib, sizeof(u32));
 218                         spin_lock_irqsave(q->lock, flags);
 219                 }
 220         }
 221         spin_unlock_irqrestore(q->lock, flags);
 222         return 0;
 223 }