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