git.oblomov.eu Git - linux-2.6/blob - 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) 2000-2007 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/spinlock.h>
  36 #include <linux/slab.h>
  37 #include <linux/completion.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/semaphore.h>
  40
  41 #include "aacraid.h"
  42
  43 /**
  44  *      aac_response_normal     -       Handle command replies
  45  *      @q: Queue to read from
  46  *
  47  *      This DPC routine will be run when the adapter interrupts us to let us
  48  *      know there is a response on our normal priority queue. We will pull off
  49  *      all QE there are and wake up all the waiters before exiting. We will
  50  *      take a spinlock out on the queue before operating on it.
  51  */
  52
  53 unsigned int aac_response_normal(struct aac_queue * q)
  54 {
  55         struct aac_dev * dev = q->dev;
  56         struct aac_entry *entry;
  57         struct hw_fib * hwfib;
  58         struct fib * fib;
  59         int consumed = 0;
  60         unsigned long flags;
  61
  62         spin_lock_irqsave(q->lock, flags);
  63         /*
  64          *      Keep pulling response QEs off the response queue and waking
  65          *      up the waiters until there are no more QEs. We then return
  66          *      back to the system. If no response was requesed we just
  67          *      deallocate the Fib here and continue.
  68          */
  69         while(aac_consumer_get(dev, q, &entry))
  70         {
  71                 int fast;
  72                 u32 index = le32_to_cpu(entry->addr);
  73                 fast = index & 0x01;
  74                 fib = &dev->fibs[index >> 2];
  75                 hwfib = fib->hw_fib_va;
  76
  77                 aac_consumer_free(dev, q, HostNormRespQueue);
  78                 /*
  79                  *      Remove this fib from the Outstanding I/O queue.
  80                  *      But only if it has not already been timed out.
  81                  *
  82                  *      If the fib has been timed out already, then just
  83                  *      continue. The caller has already been notified that
  84                  *      the fib timed out.
  85                  */
  86                 dev->queues->queue[AdapNormCmdQueue].numpending--;
  87
  88                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
  89                         spin_unlock_irqrestore(q->lock, flags);
  90                         aac_fib_complete(fib);
  91                         aac_fib_free(fib);
  92                         spin_lock_irqsave(q->lock, flags);
  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->flags = 0;
 124                         fib->callback(fib->callback_data, fib);
 125                 } else {
 126                         unsigned long flagv;
 127                         spin_lock_irqsave(&fib->event_lock, flagv);
 128                         if (!fib->done)
 129                                 fib->done = 1;
 130                         up(&fib->event_wait);
 131                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 132                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 133                         if (fib->done == 2) {
 134                                 aac_fib_complete(fib);
 135                                 aac_fib_free(fib);
 136                         }
 137                 }
 138                 consumed++;
 139                 spin_lock_irqsave(q->lock, flags);
 140         }
 141
 142         if (consumed > aac_config.peak_fibs)
 143                 aac_config.peak_fibs = consumed;
 144         if (consumed == 0)
 145                 aac_config.zero_fibs++;
 146
 147         spin_unlock_irqrestore(q->lock, flags);
 148         return 0;
 149 }
 150
 151
 152 /**
 153  *      aac_command_normal      -       handle commands
 154  *      @q: queue to process
 155  *
 156  *      This DPC routine will be queued when the adapter interrupts us to
 157  *      let us know there is a command on our normal priority queue. We will
 158  *      pull off all QE there are and wake up all the waiters before exiting.
 159  *      We will take a spinlock out on the queue before operating on it.
 160  */
 161
 162 unsigned int aac_command_normal(struct aac_queue *q)
 163 {
 164         struct aac_dev * dev = q->dev;
 165         struct aac_entry *entry;
 166         unsigned long flags;
 167
 168         spin_lock_irqsave(q->lock, flags);
 169
 170         /*
 171          *      Keep pulling response QEs off the response queue and waking
 172          *      up the waiters until there are no more QEs. We then return
 173          *      back to the system.
 174          */
 175         while(aac_consumer_get(dev, q, &entry))
 176         {
 177                 struct fib fibctx;
 178                 struct hw_fib * hw_fib;
 179                 u32 index;
 180                 struct fib *fib = &fibctx;
 181
 182                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 183                 hw_fib = &dev->aif_base_va[index];
 184
 185                 /*
 186                  *      Allocate a FIB at all costs. For non queued stuff
 187                  *      we can just use the stack so we are happy. We need
 188                  *      a fib object in order to manage the linked lists
 189                  */
 190                 if (dev->aif_thread)
 191                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 192                                 fib = &fibctx;
 193
 194                 memset(fib, 0, sizeof(struct fib));
 195                 INIT_LIST_HEAD(&fib->fiblink);
 196                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 197                 fib->size = sizeof(struct fib);
 198                 fib->hw_fib_va = hw_fib;
 199                 fib->data = hw_fib->data;
 200                 fib->dev = dev;
 201
 202
 203                 if (dev->aif_thread && fib != &fibctx) {
 204                         list_add_tail(&fib->fiblink, &q->cmdq);
 205                         aac_consumer_free(dev, q, HostNormCmdQueue);
 206                         wake_up_interruptible(&q->cmdready);
 207                 } else {
 208                         aac_consumer_free(dev, q, HostNormCmdQueue);
 209                         spin_unlock_irqrestore(q->lock, flags);
 210                         /*
 211                          *      Set the status of this FIB
 212                          */
 213                         *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
 214                         aac_fib_adapter_complete(fib, sizeof(u32));
 215                         spin_lock_irqsave(q->lock, flags);
 216                 }
 217         }
 218         spin_unlock_irqrestore(q->lock, flags);
 219         return 0;
 220 }
 221
 222
 223 /**
 224  *      aac_intr_normal -       Handle command replies
 225  *      @dev: Device
 226  *      @index: completion reference
 227  *
 228  *      This DPC routine will be run when the adapter interrupts us to let us
 229  *      know there is a response on our normal priority queue. We will pull off
 230  *      all QE there are and wake up all the waiters before exiting.
 231  */
 232
 233 unsigned int aac_intr_normal(struct aac_dev * dev, u32 index)
 234 {
 235         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
 236         if ((index & 0x00000002L)) {
 237                 struct hw_fib * hw_fib;
 238                 struct fib * fib;
 239                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 240                 unsigned long flags;
 241
 242                 if (index == 0xFFFFFFFEL) /* Special Case */
 243                         return 0;         /* Do nothing */
 244                 /*
 245                  *      Allocate a FIB. For non queued stuff we can just use
 246                  * the stack so we are happy. We need a fib object in order to
 247                  * manage the linked lists.
 248                  */
 249                 if ((!dev->aif_thread)
 250                  || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
 251                         return 1;
 252                 if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 253                         kfree (fib);
 254                         return 1;
 255                 }
 256                 memcpy(hw_fib, (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
 257                   (index & ~0x00000002L)), sizeof(struct hw_fib));
 258                 INIT_LIST_HEAD(&fib->fiblink);
 259                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 260                 fib->size = sizeof(struct fib);
 261                 fib->hw_fib_va = hw_fib;
 262                 fib->data = hw_fib->data;
 263                 fib->dev = dev;
 264
 265                 spin_lock_irqsave(q->lock, flags);
 266                 list_add_tail(&fib->fiblink, &q->cmdq);
 267                 wake_up_interruptible(&q->cmdready);
 268                 spin_unlock_irqrestore(q->lock, flags);
 269                 return 1;
 270         } else {
 271                 int fast = index & 0x01;
 272                 struct fib * fib = &dev->fibs[index >> 2];
 273                 struct hw_fib * hwfib = fib->hw_fib_va;
 274
 275                 /*
 276                  *      Remove this fib from the Outstanding I/O queue.
 277                  *      But only if it has not already been timed out.
 278                  *
 279                  *      If the fib has been timed out already, then just
 280                  *      continue. The caller has already been notified that
 281                  *      the fib timed out.
 282                  */
 283                 dev->queues->queue[AdapNormCmdQueue].numpending--;
 284
 285                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 286                         aac_fib_complete(fib);
 287                         aac_fib_free(fib);
 288                         return 0;
 289                 }
 290
 291                 if (fast) {
 292                         /*
 293                          *      Doctor the fib
 294                          */
 295                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 296                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 297                 }
 298
 299                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 300
 301                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 302                 {
 303                         __le32 *pstatus = (__le32 *)hwfib->data;
 304                         if (*pstatus & cpu_to_le32(0xffff0000))
 305                                 *pstatus = cpu_to_le32(ST_OK);
 306                 }
 307                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 308                 {
 309                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 310                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 311                         else
 312                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 313                         /*
 314                          *      NOTE:  we cannot touch the fib after this
 315                          *          call, because it may have been deallocated.
 316                          */
 317                         fib->flags = 0;
 318                         fib->callback(fib->callback_data, fib);
 319                 } else {
 320                         unsigned long flagv;
 321                         dprintk((KERN_INFO "event_wait up\n"));
 322                         spin_lock_irqsave(&fib->event_lock, flagv);
 323                         if (!fib->done)
 324                                 fib->done = 1;
 325                         up(&fib->event_wait);
 326                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 327                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 328                 }
 329                 return 0;
 330         }
 331 }