release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/gpu/drm/drm_dma.c

   1 /**
   2  * \file drm_dma.c
   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(struct drm_device *dev)
  47 {
  48         int i;
  49
  50         dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
  51         if (!dev->dma)
  52                 return -ENOMEM;
  53
  54         for (i = 0; i <= DRM_MAX_ORDER; i++)
  55                 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  56
  57         return 0;
  58 }
  59
  60 /**
  61  * Cleanup the DMA resources.
  62  *
  63  * \param dev DRM device.
  64  *
  65  * Free all pages associated with DMA buffers, the buffers and pages lists, and
  66  * finally the drm_device::dma structure itself.
  67  */
  68 void drm_dma_takedown(struct drm_device *dev)
  69 {
  70         struct drm_device_dma *dma = dev->dma;
  71         int i, j;
  72
  73         if (!dma)
  74                 return;
  75
  76         /* Clear dma buffers */
  77         for (i = 0; i <= DRM_MAX_ORDER; i++) {
  78                 if (dma->bufs[i].seg_count) {
  79                         DRM_DEBUG("order %d: buf_count = %d,"
  80                                   " seg_count = %d\n",
  81                                   i,
  82                                   dma->bufs[i].buf_count,
  83                                   dma->bufs[i].seg_count);
  84                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
  85                                 if (dma->bufs[i].seglist[j]) {
  86                                         drm_pci_free(dev, dma->bufs[i].seglist[j]);
  87                                 }
  88                         }
  89                         kfree(dma->bufs[i].seglist);
  90                 }
  91                 if (dma->bufs[i].buf_count) {
  92                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
  93                                 kfree(dma->bufs[i].buflist[j].dev_private);
  94                         }
  95                         kfree(dma->bufs[i].buflist);
  96                 }
  97         }
  98
  99         kfree(dma->buflist);
 100         kfree(dma->pagelist);
 101         kfree(dev->dma);
 102         dev->dma = NULL;
 103 }
 104
 105 /**
 106  * Free a buffer.
 107  *
 108  * \param dev DRM device.
 109  * \param buf buffer to free.
 110  *
 111  * Resets the fields of \p buf.
 112  */
 113 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 114 {
 115         if (!buf)
 116                 return;
 117
 118         buf->waiting = 0;
 119         buf->pending = 0;
 120         buf->file_priv = NULL;
 121         buf->used = 0;
 122
 123         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
 124             && waitqueue_active(&buf->dma_wait)) {
 125                 wake_up_interruptible(&buf->dma_wait);
 126         }
 127 }
 128
 129 /**
 130  * Reclaim the buffers.
 131  *
 132  * \param file_priv DRM file private.
 133  *
 134  * Frees each buffer associated with \p file_priv not already on the hardware.
 135  */
 136 void drm_core_reclaim_buffers(struct drm_device *dev,
 137                               struct drm_file *file_priv)
 138 {
 139         struct drm_device_dma *dma = dev->dma;
 140         int i;
 141
 142         if (!dma)
 143                 return;
 144         for (i = 0; i < dma->buf_count; i++) {
 145                 if (dma->buflist[i]->file_priv == file_priv) {
 146                         switch (dma->buflist[i]->list) {
 147                         case DRM_LIST_NONE:
 148                                 drm_free_buffer(dev, dma->buflist[i]);
 149                                 break;
 150                         case DRM_LIST_WAIT:
 151                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 152                                 break;
 153                         default:
 154                                 /* Buffer already on hardware. */
 155                                 break;
 156                         }
 157                 }
 158         }
 159 }
 160
 161 EXPORT_SYMBOL(drm_core_reclaim_buffers);