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/pci.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/slab.h>
  38 #include <linux/completion.h>
  39 #include <linux/blkdev.h>
  40 #include <asm/semaphore.h>
  41
  42 #include "aacraid.h"
  43
  44 /**
  45  *      aac_response_normal     -       Handle command replies
  46  *      @q: Queue to read from
  47  *
  48  *      This DPC routine will be run when the adapter interrupts us to let us
  49  *      know there is a response on our normal priority queue. We will pull off
  50  *      all QE there are and wake up all the waiters before exiting. We will
  51  *      take a spinlock out on the queue before operating on it.
  52  */
  53
  54 unsigned int aac_response_normal(struct aac_queue * q)
  55 {
  56         struct aac_dev * dev = q->dev;
  57         struct aac_entry *entry;
  58         struct hw_fib * hwfib;
  59         struct fib * fib;
  60         int consumed = 0;
  61         unsigned long flags;
  62
  63         spin_lock_irqsave(q->lock, flags);
  64         /*
  65          *      Keep pulling response QEs off the response queue and waking
  66          *      up the waiters until there are no more QEs. We then return
  67          *      back to the system. If no response was requesed we just
  68          *      deallocate the Fib here and continue.
  69          */
  70         while(aac_consumer_get(dev, q, &entry))
  71         {
  72                 int fast;
  73                 u32 index = le32_to_cpu(entry->addr);
  74                 fast = index & 0x01;
  75                 fib = &dev->fibs[index >> 2];
  76                 hwfib = fib->hw_fib_va;
  77
  78                 aac_consumer_free(dev, q, HostNormRespQueue);
  79                 /*
  80                  *      Remove this fib from the Outstanding I/O queue.
  81                  *      But only if it has not already been timed out.
  82                  *
  83                  *      If the fib has been timed out already, then just
  84                  *      continue. The caller has already been notified that
  85                  *      the fib timed out.
  86                  */
  87                 dev->queues->queue[AdapNormCmdQueue].numpending--;
  88
  89                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
  90                         spin_unlock_irqrestore(q->lock, flags);
  91                         aac_fib_complete(fib);
  92                         aac_fib_free(fib);
  93                         spin_lock_irqsave(q->lock, flags);
  94                         continue;
  95                 }
  96                 spin_unlock_irqrestore(q->lock, flags);
  97
  98                 if (fast) {
  99                         /*
 100                          *      Doctor the fib
 101                          */
 102                         *(__le32 *)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                         __le32 *pstatus = (__le32 *)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                         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         u32 index = le32_to_cpu(Index);
 236
 237         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, Index));
 238         if ((index & 0x00000002L)) {
 239                 struct hw_fib * hw_fib;
 240                 struct fib * fib;
 241                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 242                 unsigned long flags;
 243
 244                 if (index == 0xFFFFFFFEL) /* Special Case */
 245                         return 0;         /* Do nothing */
 246                 /*
 247                  *      Allocate a FIB. For non queued stuff we can just use
 248                  * the stack so we are happy. We need a fib object in order to
 249                  * manage the linked lists.
 250                  */
 251                 if ((!dev->aif_thread)
 252                  || (!(fib = kmalloc(sizeof(struct fib),GFP_ATOMIC))))
 253                         return 1;
 254                 if (!(hw_fib = kmalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 255                         kfree (fib);
 256                         return 1;
 257                 }
 258                 memset(hw_fib, 0, sizeof(struct hw_fib));
 259                 memcpy(hw_fib, (struct hw_fib *)(((ptrdiff_t)(dev->regs.sa)) +
 260                   (index & ~0x00000002L)), sizeof(struct hw_fib));
 261                 memset(fib, 0, sizeof(struct fib));
 262                 INIT_LIST_HEAD(&fib->fiblink);
 263                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 264                 fib->size = sizeof(struct fib);
 265                 fib->hw_fib_va = hw_fib;
 266                 fib->data = hw_fib->data;
 267                 fib->dev = dev;
 268
 269                 spin_lock_irqsave(q->lock, flags);
 270                 list_add_tail(&fib->fiblink, &q->cmdq);
 271                 wake_up_interruptible(&q->cmdready);
 272                 spin_unlock_irqrestore(q->lock, flags);
 273                 return 1;
 274         } else {
 275                 int fast = index & 0x01;
 276                 struct fib * fib = &dev->fibs[index >> 2];
 277                 struct hw_fib * hwfib = fib->hw_fib_va;
 278
 279                 /*
 280                  *      Remove this fib from the Outstanding I/O queue.
 281                  *      But only if it has not already been timed out.
 282                  *
 283                  *      If the fib has been timed out already, then just
 284                  *      continue. The caller has already been notified that
 285                  *      the fib timed out.
 286                  */
 287                 dev->queues->queue[AdapNormCmdQueue].numpending--;
 288
 289                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 290                         aac_fib_complete(fib);
 291                         aac_fib_free(fib);
 292                         return 0;
 293                 }
 294
 295                 if (fast) {
 296                         /*
 297                          *      Doctor the fib
 298                          */
 299                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 300                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 301                 }
 302
 303                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 304
 305                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 306                 {
 307                         u32 *pstatus = (u32 *)hwfib->data;
 308                         if (*pstatus & cpu_to_le32(0xffff0000))
 309                                 *pstatus = cpu_to_le32(ST_OK);
 310                 }
 311                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 312                 {
 313                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 314                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 315                         else
 316                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 317                         /*
 318                          *      NOTE:  we cannot touch the fib after this
 319                          *          call, because it may have been deallocated.
 320                          */
 321                         fib->callback(fib->callback_data, fib);
 322                 } else {
 323                         unsigned long flagv;
 324                         dprintk((KERN_INFO "event_wait up\n"));
 325                         spin_lock_irqsave(&fib->event_lock, flagv);
 326                         if (!fib->done)
 327                                 fib->done = 1;
 328                         up(&fib->event_wait);
 329                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 330                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 331                 }
 332                 return 0;
 333         }
 334 }