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 >> 2];
  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                         dev->queues->queue[AdapNormCmdQueue].numpending--;
  90                 else {
  91                         printk(KERN_WARNING "aacraid: FIB timeout (%x).\n", fib->flags);
  92                         printk(KERN_DEBUG"aacraid: hwfib=%p fib index=%i fib=%p\n",hwfib, hwfib->header.SenderData,fib);
  93                         continue;
  94                 }
  95                 spin_unlock_irqrestore(q->lock, flags);
  96
  97                 if (fast) {
  98                         /*
  99                          *      Doctor the fib
 100                          */
 101                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 102                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 103                 }
 104
 105                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 106
 107                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 108                 {
 109                         __le32 *pstatus = (__le32 *)hwfib->data;
 110                         if (*pstatus & cpu_to_le32(0xffff0000))
 111                                 *pstatus = cpu_to_le32(ST_OK);
 112                 }
 113                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 114                 {
 115                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 116                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 117                         else
 118                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 119                         /*
 120                          *      NOTE:  we cannot touch the fib after this
 121                          *          call, because it may have been deallocated.
 122                          */
 123                         fib->callback(fib->callback_data, fib);
 124                 } else {
 125                         unsigned long flagv;
 126                         spin_lock_irqsave(&fib->event_lock, flagv);
 127                         fib->done = 1;
 128                         up(&fib->event_wait);
 129                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 130                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 131                 }
 132                 consumed++;
 133                 spin_lock_irqsave(q->lock, flags);
 134         }
 135
 136         if (consumed > aac_config.peak_fibs)
 137                 aac_config.peak_fibs = consumed;
 138         if (consumed == 0)
 139                 aac_config.zero_fibs++;
 140
 141         spin_unlock_irqrestore(q->lock, flags);
 142         return 0;
 143 }
 144
 145
 146 /**
 147  *      aac_command_normal      -       handle commands
 148  *      @q: queue to process
 149  *
 150  *      This DPC routine will be queued when the adapter interrupts us to
 151  *      let us know there is a command on our normal priority queue. We will
 152  *      pull off all QE there are and wake up all the waiters before exiting.
 153  *      We will take a spinlock out on the queue before operating on it.
 154  */
 155
 156 unsigned int aac_command_normal(struct aac_queue *q)
 157 {
 158         struct aac_dev * dev = q->dev;
 159         struct aac_entry *entry;
 160         unsigned long flags;
 161
 162         spin_lock_irqsave(q->lock, flags);
 163
 164         /*
 165          *      Keep pulling response QEs off the response queue and waking
 166          *      up the waiters until there are no more QEs. We then return
 167          *      back to the system.
 168          */
 169         while(aac_consumer_get(dev, q, &entry))
 170         {
 171                 struct fib fibctx;
 172                 struct hw_fib * hw_fib;
 173                 u32 index;
 174                 struct fib *fib = &fibctx;
 175
 176                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 177                 hw_fib = &dev->aif_base_va[index];
 178
 179                 /*
 180                  *      Allocate a FIB at all costs. For non queued stuff
 181                  *      we can just use the stack so we are happy. We need
 182                  *      a fib object in order to manage the linked lists
 183                  */
 184                 if (dev->aif_thread)
 185                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 186                                 fib = &fibctx;
 187
 188                 memset(fib, 0, sizeof(struct fib));
 189                 INIT_LIST_HEAD(&fib->fiblink);
 190                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 191                 fib->size = sizeof(struct fib);
 192                 fib->hw_fib = hw_fib;
 193                 fib->data = hw_fib->data;
 194                 fib->dev = dev;
 195
 196
 197                 if (dev->aif_thread && fib != &fibctx) {
 198                         list_add_tail(&fib->fiblink, &q->cmdq);
 199                         aac_consumer_free(dev, q, HostNormCmdQueue);
 200                         wake_up_interruptible(&q->cmdready);
 201                 } else {
 202                         aac_consumer_free(dev, q, HostNormCmdQueue);
 203                         spin_unlock_irqrestore(q->lock, flags);
 204                         /*
 205                          *      Set the status of this FIB
 206                          */
 207                         *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
 208                         aac_fib_adapter_complete(fib, sizeof(u32));
 209                         spin_lock_irqsave(q->lock, flags);
 210                 }
 211         }
 212         spin_unlock_irqrestore(q->lock, flags);
 213         return 0;
 214 }
 215
 216
 217 /**
 218  *      aac_intr_normal -       Handle command replies
 219  *      @dev: Device
 220  *      @index: completion reference
 221  *
 222  *      This DPC routine will be run when the adapter interrupts us to let us
 223  *      know there is a response on our normal priority queue. We will pull off
 224  *      all QE there are and wake up all the waiters before exiting.
 225  */
 226
 227 unsigned int aac_intr_normal(struct aac_dev * dev, u32 Index)
 228 {
 229         u32 index = le32_to_cpu(Index);
 230
 231         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, Index));
 232         if ((index & 0x00000002L)) {
 233                 struct hw_fib * hw_fib;
 234                 struct fib * fib;
 235                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 236                 unsigned long flags;
 237
 238                 if (index == 0xFFFFFFFEL) /* Special Case */
 239                         return 0;         /* Do nothing */
 240                 /*
 241                  *      Allocate a FIB. For non queued stuff we can just use
 242                  * the stack so we are happy. We need a fib object in order to
 243                  * manage the linked lists.
 244                  */
 245                 if ((!dev->aif_thread)
 246                  || (!(fib = kmalloc(sizeof(struct fib),GFP_ATOMIC))))
 247                         return 1;
 248                 if (!(hw_fib = kmalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 249                         kfree (fib);
 250                         return 1;
 251                 }
 252                 memset(hw_fib, 0, sizeof(struct hw_fib));
 253                 memcpy(hw_fib, (struct hw_fib *)(((unsigned long)(dev->regs.sa)) + (index & ~0x00000002L)), sizeof(struct hw_fib));
 254                 memset(fib, 0, sizeof(struct fib));
 255                 INIT_LIST_HEAD(&fib->fiblink);
 256                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 257                 fib->size = sizeof(struct fib);
 258                 fib->hw_fib = hw_fib;
 259                 fib->data = hw_fib->data;
 260                 fib->dev = dev;
 261
 262                 spin_lock_irqsave(q->lock, flags);
 263                 list_add_tail(&fib->fiblink, &q->cmdq);
 264                 wake_up_interruptible(&q->cmdready);
 265                 spin_unlock_irqrestore(q->lock, flags);
 266                 return 1;
 267         } else {
 268                 int fast = index & 0x01;
 269                 struct fib * fib = &dev->fibs[index >> 2];
 270                 struct hw_fib * hwfib = fib->hw_fib;
 271
 272                 /*
 273                  *      Remove this fib from the Outstanding I/O queue.
 274                  *      But only if it has not already been timed out.
 275                  *
 276                  *      If the fib has been timed out already, then just
 277                  *      continue. The caller has already been notified that
 278                  *      the fib timed out.
 279                  */
 280                 if ((fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 281                         printk(KERN_WARNING "aacraid: FIB timeout (%x).\n", fib->flags);
 282                         printk(KERN_DEBUG"aacraid: hwfib=%p index=%i fib=%p\n",hwfib, hwfib->header.SenderData,fib);
 283                         return 0;
 284                 }
 285
 286                 dev->queues->queue[AdapNormCmdQueue].numpending--;
 287
 288                 if (fast) {
 289                         /*
 290                          *      Doctor the fib
 291                          */
 292                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 293                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 294                 }
 295
 296                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 297
 298                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 299                 {
 300                         u32 *pstatus = (u32 *)hwfib->data;
 301                         if (*pstatus & cpu_to_le32(0xffff0000))
 302                                 *pstatus = cpu_to_le32(ST_OK);
 303                 }
 304                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 305                 {
 306                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 307                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 308                         else
 309                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 310                         /*
 311                          *      NOTE:  we cannot touch the fib after this
 312                          *          call, because it may have been deallocated.
 313                          */
 314                         fib->callback(fib->callback_data, fib);
 315                 } else {
 316                         unsigned long flagv;
 317                         dprintk((KERN_INFO "event_wait up\n"));
 318                         spin_lock_irqsave(&fib->event_lock, flagv);
 319                         fib->done = 1;
 320                         up(&fib->event_wait);
 321                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 322                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 323                 }
 324                 return 0;
 325         }
 326 }