bsd/drm_lists.h

   1 /* drm_lists.h -- Buffer list handling routines -*- linux-c -*-
   2  * Created: Mon Apr 19 20:54:22 1999 by faith@valinux.com
   3  *
   4  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
   5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   6  * All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the next
  16  * paragraph) shall be included in all copies or substantial portions of the
  17  * Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  25  * OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  * Authors:
  28  *    Rickard E. (Rik) Faith <faith@valinux.com>
  29  *    Gareth Hughes <gareth@valinux.com>
  30  */
  31
  32 #define __NO_VERSION__
  33 #include "drmP.h"
  34
  35 #if __HAVE_DMA_WAITLIST
  36
  37 int DRM(waitlist_create)(drm_waitlist_t *bl, int count)
  38 {
  39         if (bl->count)
  40                 DRM_OS_RETURN( EINVAL );
  41
  42         bl->bufs       = DRM(alloc)((bl->count + 2) * sizeof(*bl->bufs),
  43                                     DRM_MEM_BUFLISTS);
  44
  45         if(!bl->bufs) DRM_OS_RETURN(ENOMEM);
  46
  47         memset(bl->bufs, 0, sizeof(*bl->bufs));
  48
  49         bl->count      = count;
  50         bl->rp         = bl->bufs;
  51         bl->wp         = bl->bufs;
  52         bl->end        = &bl->bufs[bl->count+1];
  53         DRM_OS_SPININIT( bl->write_lock, "writelock" );
  54         DRM_OS_SPININIT( bl->read_lock, "readlock" );
  55         return 0;
  56 }
  57
  58 int DRM(waitlist_destroy)(drm_waitlist_t *bl)
  59 {
  60         if (bl->rp != bl->wp)
  61                 DRM_OS_RETURN( EINVAL );
  62         if (bl->bufs) DRM(free)(bl->bufs,
  63                                 (bl->count + 2) * sizeof(*bl->bufs),
  64                                 DRM_MEM_BUFLISTS);
  65         bl->count = 0;
  66         bl->bufs  = NULL;
  67         bl->rp    = NULL;
  68         bl->wp    = NULL;
  69         bl->end   = NULL;
  70         return 0;
  71 }
  72
  73 int DRM(waitlist_put)(drm_waitlist_t *bl, drm_buf_t *buf)
  74 {
  75         int           left;
  76         int             s;
  77         left = DRM_LEFTCOUNT(bl);
  78         if (!left) {
  79                 DRM_ERROR("Overflow while adding buffer %d from pid %d\n",
  80                           buf->idx, buf->pid);
  81                 DRM_OS_RETURN( EINVAL );
  82         }
  83 #if __HAVE_DMA_HISTOGRAM
  84         getnanotime(&buf->time_queued);
  85 #endif
  86         buf->list        = DRM_LIST_WAIT;
  87
  88         DRM_OS_SPINLOCK(&bl->write_lock);
  89         s = spldrm();
  90         *bl->wp = buf;
  91         if (++bl->wp >= bl->end) bl->wp = bl->bufs;
  92         splx(s);
  93         DRM_OS_SPINUNLOCK(&bl->write_lock);
  94
  95         return 0;
  96 }
  97
  98 drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl)
  99 {
 100         drm_buf_t     *buf;
 101         int             s;
 102
 103         DRM_OS_SPINLOCK(&bl->read_lock);
 104         s = spldrm();
 105         buf = *bl->rp;
 106         if (bl->rp == bl->wp) {
 107                 splx(s);
 108                 DRM_OS_SPINUNLOCK(&bl->read_lock);
 109                 return NULL;
 110         }
 111         if (++bl->rp >= bl->end) bl->rp = bl->bufs;
 112         splx(s);
 113         DRM_OS_SPINUNLOCK(&bl->read_lock);
 114
 115         return buf;
 116 }
 117
 118 #endif /* __HAVE_DMA_WAITLIST */
 119
 120
 121 #if __HAVE_DMA_FREELIST
 122
 123 int DRM(freelist_create)(drm_freelist_t *bl, int count)
 124 {
 125         atomic_set(&bl->count, 0);
 126         bl->next      = NULL;
 127         bl->waiting = 0;
 128
 129         bl->low_mark  = 0;
 130         bl->high_mark = 0;
 131         atomic_set(&bl->wfh,   0);
 132         DRM_OS_SPININIT( bl->lock, "freelistlock" );
 133         ++bl->initialized;
 134         return 0;
 135 }
 136
 137 int DRM(freelist_destroy)(drm_freelist_t *bl)
 138 {
 139         atomic_set(&bl->count, 0);
 140         bl->next = NULL;
 141         return 0;
 142 }
 143
 144 int DRM(freelist_put)(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf)
 145 {
 146         drm_device_dma_t *dma  = dev->dma;
 147
 148         if (!dma) {
 149                 DRM_ERROR("No DMA support\n");
 150                 return 1;
 151         }
 152
 153         if (buf->waiting || buf->pending || buf->list == DRM_LIST_FREE) {
 154                 DRM_ERROR("Freed buffer %d: w%d, p%d, l%d\n",
 155                           buf->idx, buf->waiting, buf->pending, buf->list);
 156         }
 157         if (!bl) return 1;
 158 #if __HAVE_DMA_HISTOGRAM
 159         getnanotime(&buf->time_queued);
 160         DRM(histogram_compute)(dev, buf);
 161 #endif
 162         buf->list       = DRM_LIST_FREE;
 163
 164         DRM_OS_SPINLOCK( &bl->lock );
 165         buf->next       = bl->next;
 166         bl->next        = buf;
 167         DRM_OS_SPINUNLOCK( &bl->lock );
 168
 169         atomic_inc(&bl->count);
 170         if (atomic_read(&bl->count) > dma->buf_count) {
 171                 DRM_ERROR("%ld of %d buffers free after addition of %d\n",
 172                           (unsigned long)atomic_read(&bl->count),
 173                                 dma->buf_count, buf->idx);
 174                 return 1;
 175         }
 176                                 /* Check for high water mark */
 177         if (atomic_read(&bl->wfh) && atomic_read(&bl->count)>=bl->high_mark) {
 178                 atomic_set(&bl->wfh, 0);
 179                 DRM_OS_WAKEUP_INT(&bl->waiting);
 180         }
 181         return 0;
 182 }
 183
 184 static drm_buf_t *DRM(freelist_try)(drm_freelist_t *bl)
 185 {
 186         drm_buf_t         *buf;
 187
 188         if (!bl) return NULL;
 189
 190                                 /* Get buffer */
 191         DRM_OS_SPINLOCK(&bl->lock);
 192         if (!bl->next) {
 193                 DRM_OS_SPINUNLOCK(&bl->lock);
 194                 return NULL;
 195         }
 196         buf       = bl->next;
 197         bl->next  = bl->next->next;
 198         DRM_OS_SPINUNLOCK(&bl->lock);
 199
 200         atomic_dec(&bl->count);
 201         buf->next = NULL;
 202         buf->list = DRM_LIST_NONE;
 203         if (buf->waiting || buf->pending) {
 204                 DRM_ERROR("Free buffer %d: w%d, p%d, l%d\n",
 205                           buf->idx, buf->waiting, buf->pending, buf->list);
 206         }
 207
 208         return buf;
 209 }
 210
 211 drm_buf_t *DRM(freelist_get)(drm_freelist_t *bl, int block)
 212 {
 213         drm_buf_t         *buf  = NULL;
 214         int     error;
 215
 216         if (!bl || !bl->initialized) return NULL;
 217
 218                                 /* Check for low water mark */
 219         if (atomic_read(&bl->count) <= bl->low_mark) /* Became low */
 220                 atomic_set(&bl->wfh, 1);
 221         if (atomic_read(&bl->wfh)) {
 222                 if (block) {
 223                         for (;;) {
 224                                 if (!atomic_read(&bl->wfh)
 225                                     && (buf = DRM(freelist_try(bl)))) break;
 226                                 error = tsleep(&bl->waiting, PZERO|PCATCH,
 227                                                "drmfg", 0);
 228                                 if (error)
 229                                         break;
 230                         }
 231                 }
 232                 return buf;
 233         }
 234
 235         return DRM(freelist_try)(bl);
 236 }
 237
 238 #endif /* __HAVE_DMA_FREELIST */