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 <asm/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->callback(fib->callback_data, fib);
 124                 } else {
 125                         unsigned long flagv;
 126                         spin_lock_irqsave(&fib->event_lock, flagv);
 127                         if (!fib->done)
 128                                 fib->done = 1;
 129                         up(&fib->event_wait);
 130                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 131                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 132                         if (fib->done == 2) {
 133                                 aac_fib_complete(fib);
 134                                 aac_fib_free(fib);
 135                         }
 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         while(aac_consumer_get(dev, q, &entry))
 175         {
 176                 struct fib fibctx;
 177                 struct hw_fib * hw_fib;
 178                 u32 index;
 179                 struct fib *fib = &fibctx;
 180
 181                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 182                 hw_fib = &dev->aif_base_va[index];
 183
 184                 /*
 185                  *      Allocate a FIB at all costs. For non queued stuff
 186                  *      we can just use the stack so we are happy. We need
 187                  *      a fib object in order to manage the linked lists
 188                  */
 189                 if (dev->aif_thread)
 190                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 191                                 fib = &fibctx;
 192
 193                 memset(fib, 0, sizeof(struct fib));
 194                 INIT_LIST_HEAD(&fib->fiblink);
 195                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 196                 fib->size = sizeof(struct fib);
 197                 fib->hw_fib_va = hw_fib;
 198                 fib->data = hw_fib->data;
 199                 fib->dev = dev;
 200
 201
 202                 if (dev->aif_thread && fib != &fibctx) {
 203                         list_add_tail(&fib->fiblink, &q->cmdq);
 204                         aac_consumer_free(dev, q, HostNormCmdQueue);
 205                         wake_up_interruptible(&q->cmdready);
 206                 } else {
 207                         aac_consumer_free(dev, q, HostNormCmdQueue);
 208                         spin_unlock_irqrestore(q->lock, flags);
 209                         /*
 210                          *      Set the status of this FIB
 211                          */
 212                         *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
 213                         aac_fib_adapter_complete(fib, sizeof(u32));
 214                         spin_lock_irqsave(q->lock, flags);
 215                 }
 216         }
 217         spin_unlock_irqrestore(q->lock, flags);
 218         return 0;
 219 }
 220
 221
 222 /**
 223  *      aac_intr_normal -       Handle command replies
 224  *      @dev: Device
 225  *      @index: completion reference
 226  *
 227  *      This DPC routine will be run when the adapter interrupts us to let us
 228  *      know there is a response on our normal priority queue. We will pull off
 229  *      all QE there are and wake up all the waiters before exiting.
 230  */
 231
 232 unsigned int aac_intr_normal(struct aac_dev * dev, u32 Index)
 233 {
 234         u32 index = le32_to_cpu(Index);
 235
 236         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, Index));
 237         if ((index & 0x00000002L)) {
 238                 struct hw_fib * hw_fib;
 239                 struct fib * fib;
 240                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 241                 unsigned long flags;
 242
 243                 if (index == 0xFFFFFFFEL) /* Special Case */
 244                         return 0;         /* Do nothing */
 245                 /*
 246                  *      Allocate a FIB. For non queued stuff we can just use
 247                  * the stack so we are happy. We need a fib object in order to
 248                  * manage the linked lists.
 249                  */
 250                 if ((!dev->aif_thread)
 251                  || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
 252                         return 1;
 253                 if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 254                         kfree (fib);
 255                         return 1;
 256                 }
 257                 memcpy(hw_fib, (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
 258                   (index & ~0x00000002L)), sizeof(struct hw_fib));
 259                 INIT_LIST_HEAD(&fib->fiblink);
 260                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 261                 fib->size = sizeof(struct fib);
 262                 fib->hw_fib_va = 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_va;
 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                 dev->queues->queue[AdapNormCmdQueue].numpending--;
 285
 286                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 287                         aac_fib_complete(fib);
 288                         aac_fib_free(fib);
 289                         return 0;
 290                 }
 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 }