drivers/scsi/aacraid/dpcsup.c

   1 /*
   2  *      Adaptec AAC series RAID controller driver
   3  *      (c) Copyright 2001 Red Hat Inc.
   4  *
   5  * based on the old aacraid driver that is..
   6  * Adaptec aacraid device driver for Linux.
   7  *
   8  * Copyright (c) 2000-2010 Adaptec, Inc.
   9  *               2010 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2, or (at your option)
  14  * any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; see the file COPYING.  If not, write to
  23  * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Module Name:
  26  *  dpcsup.c
  27  *
  28  * Abstract: All DPC processing routines for the cyclone board occur here.
  29  *
  30  *
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/init.h>
  35 #include <linux/types.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/slab.h>
  38 #include <linux/completion.h>
  39 #include <linux/blkdev.h>
  40 #include <linux/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, mflags;
  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                 atomic_dec(&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                         fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
 105                 }
 106
 107                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 108
 109                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 110                 {
 111                         __le32 *pstatus = (__le32 *)hwfib->data;
 112                         if (*pstatus & cpu_to_le32(0xffff0000))
 113                                 *pstatus = cpu_to_le32(ST_OK);
 114                 }
 115                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 116                 {
 117                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 118                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 119                         else
 120                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 121                         /*
 122                          *      NOTE:  we cannot touch the fib after this
 123                          *          call, because it may have been deallocated.
 124                          */
 125                         fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
 126                         fib->callback(fib->callback_data, fib);
 127                 } else {
 128                         unsigned long flagv;
 129                         spin_lock_irqsave(&fib->event_lock, flagv);
 130                         if (!fib->done) {
 131                                 fib->done = 1;
 132                                 up(&fib->event_wait);
 133                         }
 134                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 135
 136                         spin_lock_irqsave(&dev->manage_lock, mflags);
 137                         dev->management_fib_count--;
 138                         spin_unlock_irqrestore(&dev->manage_lock, mflags);
 139
 140                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 141                         if (fib->done == 2) {
 142                                 spin_lock_irqsave(&fib->event_lock, flagv);
 143                                 fib->done = 0;
 144                                 spin_unlock_irqrestore(&fib->event_lock, flagv);
 145                                 aac_fib_complete(fib);
 146                                 aac_fib_free(fib);
 147                         }
 148                 }
 149                 consumed++;
 150                 spin_lock_irqsave(q->lock, flags);
 151         }
 152
 153         if (consumed > aac_config.peak_fibs)
 154                 aac_config.peak_fibs = consumed;
 155         if (consumed == 0)
 156                 aac_config.zero_fibs++;
 157
 158         spin_unlock_irqrestore(q->lock, flags);
 159         return 0;
 160 }
 161
 162
 163 /**
 164  *      aac_command_normal      -       handle commands
 165  *      @q: queue to process
 166  *
 167  *      This DPC routine will be queued when the adapter interrupts us to
 168  *      let us know there is a command on our normal priority queue. We will
 169  *      pull off all QE there are and wake up all the waiters before exiting.
 170  *      We will take a spinlock out on the queue before operating on it.
 171  */
 172
 173 unsigned int aac_command_normal(struct aac_queue *q)
 174 {
 175         struct aac_dev * dev = q->dev;
 176         struct aac_entry *entry;
 177         unsigned long flags;
 178
 179         spin_lock_irqsave(q->lock, flags);
 180
 181         /*
 182          *      Keep pulling response QEs off the response queue and waking
 183          *      up the waiters until there are no more QEs. We then return
 184          *      back to the system.
 185          */
 186         while(aac_consumer_get(dev, q, &entry))
 187         {
 188                 struct fib fibctx;
 189                 struct hw_fib * hw_fib;
 190                 u32 index;
 191                 struct fib *fib = &fibctx;
 192
 193                 index = le32_to_cpu(entry->addr) / sizeof(struct hw_fib);
 194                 hw_fib = &dev->aif_base_va[index];
 195
 196                 /*
 197                  *      Allocate a FIB at all costs. For non queued stuff
 198                  *      we can just use the stack so we are happy. We need
 199                  *      a fib object in order to manage the linked lists
 200                  */
 201                 if (dev->aif_thread)
 202                         if((fib = kmalloc(sizeof(struct fib), GFP_ATOMIC)) == NULL)
 203                                 fib = &fibctx;
 204
 205                 memset(fib, 0, sizeof(struct fib));
 206                 INIT_LIST_HEAD(&fib->fiblink);
 207                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 208                 fib->size = sizeof(struct fib);
 209                 fib->hw_fib_va = hw_fib;
 210                 fib->data = hw_fib->data;
 211                 fib->dev = dev;
 212
 213
 214                 if (dev->aif_thread && fib != &fibctx) {
 215                         list_add_tail(&fib->fiblink, &q->cmdq);
 216                         aac_consumer_free(dev, q, HostNormCmdQueue);
 217                         wake_up_interruptible(&q->cmdready);
 218                 } else {
 219                         aac_consumer_free(dev, q, HostNormCmdQueue);
 220                         spin_unlock_irqrestore(q->lock, flags);
 221                         /*
 222                          *      Set the status of this FIB
 223                          */
 224                         *(__le32 *)hw_fib->data = cpu_to_le32(ST_OK);
 225                         aac_fib_adapter_complete(fib, sizeof(u32));
 226                         spin_lock_irqsave(q->lock, flags);
 227                 }
 228         }
 229         spin_unlock_irqrestore(q->lock, flags);
 230         return 0;
 231 }
 232
 233 /*
 234  *
 235  * aac_aif_callback
 236  * @context: the context set in the fib - here it is scsi cmd
 237  * @fibptr: pointer to the fib
 238  *
 239  * Handles the AIFs - new method (SRC)
 240  *
 241  */
 242
 243 static void aac_aif_callback(void *context, struct fib * fibptr)
 244 {
 245         struct fib *fibctx;
 246         struct aac_dev *dev;
 247         struct aac_aifcmd *cmd;
 248         int status;
 249
 250         fibctx = (struct fib *)context;
 251         BUG_ON(fibptr == NULL);
 252         dev = fibptr->dev;
 253
 254         if (fibptr->hw_fib_va->header.XferState &
 255             cpu_to_le32(NoMoreAifDataAvailable)) {
 256                 aac_fib_complete(fibptr);
 257                 aac_fib_free(fibptr);
 258                 return;
 259         }
 260
 261         aac_intr_normal(dev, 0, 1, 0, fibptr->hw_fib_va);
 262
 263         aac_fib_init(fibctx);
 264         cmd = (struct aac_aifcmd *) fib_data(fibctx);
 265         cmd->command = cpu_to_le32(AifReqEvent);
 266
 267         status = aac_fib_send(AifRequest,
 268                 fibctx,
 269                 sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
 270                 FsaNormal,
 271                 0, 1,
 272                 (fib_callback)aac_aif_callback, fibctx);
 273 }
 274
 275
 276 /**
 277  *      aac_intr_normal -       Handle command replies
 278  *      @dev: Device
 279  *      @index: completion reference
 280  *
 281  *      This DPC routine will be run when the adapter interrupts us to let us
 282  *      know there is a response on our normal priority queue. We will pull off
 283  *      all QE there are and wake up all the waiters before exiting.
 284  */
 285 unsigned int aac_intr_normal(struct aac_dev *dev, u32 index,
 286                         int isAif, int isFastResponse, struct hw_fib *aif_fib)
 287 {
 288         unsigned long mflags;
 289         dprintk((KERN_INFO "aac_intr_normal(%p,%x)\n", dev, index));
 290         if (isAif == 1) {       /* AIF - common */
 291                 struct hw_fib * hw_fib;
 292                 struct fib * fib;
 293                 struct aac_queue *q = &dev->queues->queue[HostNormCmdQueue];
 294                 unsigned long flags;
 295
 296                 /*
 297                  *      Allocate a FIB. For non queued stuff we can just use
 298                  * the stack so we are happy. We need a fib object in order to
 299                  * manage the linked lists.
 300                  */
 301                 if ((!dev->aif_thread)
 302                  || (!(fib = kzalloc(sizeof(struct fib),GFP_ATOMIC))))
 303                         return 1;
 304                 if (!(hw_fib = kzalloc(sizeof(struct hw_fib),GFP_ATOMIC))) {
 305                         kfree (fib);
 306                         return 1;
 307                 }
 308                 if (aif_fib != NULL) {
 309                         memcpy(hw_fib, aif_fib, sizeof(struct hw_fib));
 310                 } else {
 311                         memcpy(hw_fib,
 312                                 (struct hw_fib *)(((uintptr_t)(dev->regs.sa)) +
 313                                 index), sizeof(struct hw_fib));
 314                 }
 315                 INIT_LIST_HEAD(&fib->fiblink);
 316                 fib->type = FSAFS_NTC_FIB_CONTEXT;
 317                 fib->size = sizeof(struct fib);
 318                 fib->hw_fib_va = hw_fib;
 319                 fib->data = hw_fib->data;
 320                 fib->dev = dev;
 321
 322                 spin_lock_irqsave(q->lock, flags);
 323                 list_add_tail(&fib->fiblink, &q->cmdq);
 324                 wake_up_interruptible(&q->cmdready);
 325                 spin_unlock_irqrestore(q->lock, flags);
 326                 return 1;
 327         } else if (isAif == 2) {        /* AIF - new (SRC) */
 328                 struct fib *fibctx;
 329                 struct aac_aifcmd *cmd;
 330
 331                 fibctx = aac_fib_alloc(dev);
 332                 if (!fibctx)
 333                         return 1;
 334                 aac_fib_init(fibctx);
 335
 336                 cmd = (struct aac_aifcmd *) fib_data(fibctx);
 337                 cmd->command = cpu_to_le32(AifReqEvent);
 338
 339                 return aac_fib_send(AifRequest,
 340                         fibctx,
 341                         sizeof(struct hw_fib)-sizeof(struct aac_fibhdr),
 342                         FsaNormal,
 343                         0, 1,
 344                         (fib_callback)aac_aif_callback, fibctx);
 345         } else {
 346                 struct fib *fib = &dev->fibs[index];
 347                 struct hw_fib * hwfib = fib->hw_fib_va;
 348
 349                 /*
 350                  *      Remove this fib from the Outstanding I/O queue.
 351                  *      But only if it has not already been timed out.
 352                  *
 353                  *      If the fib has been timed out already, then just
 354                  *      continue. The caller has already been notified that
 355                  *      the fib timed out.
 356                  */
 357                 atomic_dec(&dev->queues->queue[AdapNormCmdQueue].numpending);
 358
 359                 if (unlikely(fib->flags & FIB_CONTEXT_FLAG_TIMED_OUT)) {
 360                         aac_fib_complete(fib);
 361                         aac_fib_free(fib);
 362                         return 0;
 363                 }
 364
 365                 if (isFastResponse) {
 366                         /*
 367                          *      Doctor the fib
 368                          */
 369                         *(__le32 *)hwfib->data = cpu_to_le32(ST_OK);
 370                         hwfib->header.XferState |= cpu_to_le32(AdapterProcessed);
 371                         fib->flags |= FIB_CONTEXT_FLAG_FASTRESP;
 372                 }
 373
 374                 FIB_COUNTER_INCREMENT(aac_config.FibRecved);
 375
 376                 if (hwfib->header.Command == cpu_to_le16(NuFileSystem))
 377                 {
 378                         __le32 *pstatus = (__le32 *)hwfib->data;
 379                         if (*pstatus & cpu_to_le32(0xffff0000))
 380                                 *pstatus = cpu_to_le32(ST_OK);
 381                 }
 382                 if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected | Async))
 383                 {
 384                         if (hwfib->header.XferState & cpu_to_le32(NoResponseExpected))
 385                                 FIB_COUNTER_INCREMENT(aac_config.NoResponseRecved);
 386                         else
 387                                 FIB_COUNTER_INCREMENT(aac_config.AsyncRecved);
 388                         /*
 389                          *      NOTE:  we cannot touch the fib after this
 390                          *          call, because it may have been deallocated.
 391                          */
 392                         if (likely(fib->callback && fib->callback_data)) {
 393                                 fib->flags &= FIB_CONTEXT_FLAG_FASTRESP;
 394                                 fib->callback(fib->callback_data, fib);
 395                         } else {
 396                                 aac_fib_complete(fib);
 397                         }
 398                 } else {
 399                         unsigned long flagv;
 400                         dprintk((KERN_INFO "event_wait up\n"));
 401                         spin_lock_irqsave(&fib->event_lock, flagv);
 402                         if (!fib->done) {
 403                                 fib->done = 1;
 404                                 up(&fib->event_wait);
 405                         }
 406                         spin_unlock_irqrestore(&fib->event_lock, flagv);
 407
 408                         spin_lock_irqsave(&dev->manage_lock, mflags);
 409                         dev->management_fib_count--;
 410                         spin_unlock_irqrestore(&dev->manage_lock, mflags);
 411
 412                         FIB_COUNTER_INCREMENT(aac_config.NormalRecved);
 413                         if (fib->done == 2) {
 414                                 spin_lock_irqsave(&fib->event_lock, flagv);
 415                                 fib->done = 0;
 416                                 spin_unlock_irqrestore(&fib->event_lock, flagv);
 417                                 aac_fib_complete(fib);
 418                         }
 419
 420                 }
 421                 return 0;
 422         }
 423 }