drivers/char/drm/drm_dma.c

   1 /**
   2  * \file drm_dma.h
   3  * DMA IOCTL and function support
   4  *
   5  * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6  * \author Gareth Hughes <gareth@valinux.com>
   7  */
   8
   9 /*
  10  * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
  11  *
  12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
  13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  14  * All Rights Reserved.
  15  *
  16  * Permission is hereby granted, free of charge, to any person obtaining a
  17  * copy of this software and associated documentation files (the "Software"),
  18  * to deal in the Software without restriction, including without limitation
  19  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  20  * and/or sell copies of the Software, and to permit persons to whom the
  21  * Software is furnished to do so, subject to the following conditions:
  22  *
  23  * The above copyright notice and this permission notice (including the next
  24  * paragraph) shall be included in all copies or substantial portions of the
  25  * Software.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  30  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  31  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  32  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  33  * OTHER DEALINGS IN THE SOFTWARE.
  34  */
  35
  36 #include "drmP.h"
  37
  38 /**
  39  * Initialize the DMA data.
  40  *
  41  * \param dev DRM device.
  42  * \return zero on success or a negative value on failure.
  43  *
  44  * Allocate and initialize a drm_device_dma structure.
  45  */
  46 int drm_dma_setup( drm_device_t *dev )
  47 {
  48         int i;
  49
  50         dev->dma = drm_alloc( sizeof(*dev->dma), DRM_MEM_DRIVER );
  51         if ( !dev->dma )
  52                 return -ENOMEM;
  53
  54         memset( dev->dma, 0, sizeof(*dev->dma) );
  55
  56         for ( i = 0 ; i <= DRM_MAX_ORDER ; i++ )
  57                 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  58
  59         return 0;
  60 }
  61
  62 /**
  63  * Cleanup the DMA resources.
  64  *
  65  * \param dev DRM device.
  66  *
  67  * Free all pages associated with DMA buffers, the buffers and pages lists, and
  68  * finally the the drm_device::dma structure itself.
  69  */
  70 void drm_dma_takedown(drm_device_t *dev)
  71 {
  72         drm_device_dma_t  *dma = dev->dma;
  73         int               i, j;
  74
  75         if (!dma) return;
  76
  77                                 /* Clear dma buffers */
  78         for (i = 0; i <= DRM_MAX_ORDER; i++) {
  79                 if (dma->bufs[i].seg_count) {
  80                         DRM_DEBUG("order %d: buf_count = %d,"
  81                                   " seg_count = %d\n",
  82                                   i,
  83                                   dma->bufs[i].buf_count,
  84                                   dma->bufs[i].seg_count);
  85                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
  86                                 if (dma->bufs[i].seglist[j]) {
  87                                         drm_free_pages(dma->bufs[i].seglist[j],
  88                                                         dma->bufs[i].page_order,
  89                                                         DRM_MEM_DMA);
  90                                 }
  91                         }
  92                         drm_free(dma->bufs[i].seglist,
  93                                   dma->bufs[i].seg_count
  94                                   * sizeof(*dma->bufs[0].seglist),
  95                                   DRM_MEM_SEGS);
  96                 }
  97                 if (dma->bufs[i].buf_count) {
  98                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
  99                                 if (dma->bufs[i].buflist[j].dev_private) {
 100                                         drm_free(dma->bufs[i].buflist[j].dev_private,
 101                                                   dma->bufs[i].buflist[j].dev_priv_size,
 102                                                   DRM_MEM_BUFS);
 103                                 }
 104                         }
 105                         drm_free(dma->bufs[i].buflist,
 106                                   dma->bufs[i].buf_count *
 107                                   sizeof(*dma->bufs[0].buflist),
 108                                   DRM_MEM_BUFS);
 109                 }
 110         }
 111
 112         if (dma->buflist) {
 113                 drm_free(dma->buflist,
 114                           dma->buf_count * sizeof(*dma->buflist),
 115                           DRM_MEM_BUFS);
 116         }
 117
 118         if (dma->pagelist) {
 119                 drm_free(dma->pagelist,
 120                           dma->page_count * sizeof(*dma->pagelist),
 121                           DRM_MEM_PAGES);
 122         }
 123         drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
 124         dev->dma = NULL;
 125 }
 126
 127
 128 /**
 129  * Free a buffer.
 130  *
 131  * \param dev DRM device.
 132  * \param buf buffer to free.
 133  *
 134  * Resets the fields of \p buf.
 135  */
 136 void drm_free_buffer(drm_device_t *dev, drm_buf_t *buf)
 137 {
 138         if (!buf) return;
 139
 140         buf->waiting  = 0;
 141         buf->pending  = 0;
 142         buf->filp     = NULL;
 143         buf->used     = 0;
 144
 145         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE) && waitqueue_active(&buf->dma_wait)) {
 146                 wake_up_interruptible(&buf->dma_wait);
 147         }
 148 }
 149
 150 /**
 151  * Reclaim the buffers.
 152  *
 153  * \param filp file pointer.
 154  *
 155  * Frees each buffer associated with \p filp not already on the hardware.
 156  */
 157 void drm_core_reclaim_buffers(drm_device_t *dev, struct file *filp)
 158 {
 159         drm_device_dma_t *dma = dev->dma;
 160         int              i;
 161
 162         if (!dma) return;
 163         for (i = 0; i < dma->buf_count; i++) {
 164                 if (dma->buflist[i]->filp == filp) {
 165                         switch (dma->buflist[i]->list) {
 166                         case DRM_LIST_NONE:
 167                                 drm_free_buffer(dev, dma->buflist[i]);
 168                                 break;
 169                         case DRM_LIST_WAIT:
 170                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 171                                 break;
 172                         default:
 173                                 /* Buffer already on hardware. */
 174                                 break;
 175                         }
 176                 }
 177         }
 178 }
 179 EXPORT_SYMBOL(drm_core_reclaim_buffers);
 180