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 = kmalloc(sizeof(*dev->dma), GFP_KERNEL);
  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 drm_device::dma structure itself.
  69  */
  70 void drm_dma_takedown(struct drm_device *dev)
  71 {
  72         struct drm_device_dma *dma = dev->dma;
  73         int i, j;
  74
  75         if (!dma)
  76                 return;
  77
  78         /* Clear dma buffers */
  79         for (i = 0; i <= DRM_MAX_ORDER; i++) {
  80                 if (dma->bufs[i].seg_count) {
  81                         DRM_DEBUG("order %d: buf_count = %d,"
  82                                   " seg_count = %d\n",
  83                                   i,
  84                                   dma->bufs[i].buf_count,
  85                                   dma->bufs[i].seg_count);
  86                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
  87                                 if (dma->bufs[i].seglist[j]) {
  88                                         drm_pci_free(dev, dma->bufs[i].seglist[j]);
  89                                 }
  90                         }
  91                         kfree(dma->bufs[i].seglist);
  92                 }
  93                 if (dma->bufs[i].buf_count) {
  94                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
  95                                 kfree(dma->bufs[i].buflist[j].dev_private);
  96                         }
  97                         kfree(dma->bufs[i].buflist);
  98                 }
  99         }
 100
 101         kfree(dma->buflist);
 102         kfree(dma->pagelist);
 103         kfree(dev->dma);
 104         dev->dma = NULL;
 105 }
 106
 107 /**
 108  * Free a buffer.
 109  *
 110  * \param dev DRM device.
 111  * \param buf buffer to free.
 112  *
 113  * Resets the fields of \p buf.
 114  */
 115 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 116 {
 117         if (!buf)
 118                 return;
 119
 120         buf->waiting = 0;
 121         buf->pending = 0;
 122         buf->file_priv = NULL;
 123         buf->used = 0;
 124
 125         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
 126             && waitqueue_active(&buf->dma_wait)) {
 127                 wake_up_interruptible(&buf->dma_wait);
 128         }
 129 }
 130
 131 /**
 132  * Reclaim the buffers.
 133  *
 134  * \param file_priv DRM file private.
 135  *
 136  * Frees each buffer associated with \p file_priv not already on the hardware.
 137  */
 138 void drm_core_reclaim_buffers(struct drm_device *dev,
 139                               struct drm_file *file_priv)
 140 {
 141         struct drm_device_dma *dma = dev->dma;
 142         int i;
 143
 144         if (!dma)
 145                 return;
 146         for (i = 0; i < dma->buf_count; i++) {
 147                 if (dma->buflist[i]->file_priv == file_priv) {
 148                         switch (dma->buflist[i]->list) {
 149                         case DRM_LIST_NONE:
 150                                 drm_free_buffer(dev, dma->buflist[i]);
 151                                 break;
 152                         case DRM_LIST_WAIT:
 153                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 154                                 break;
 155                         default:
 156                                 /* Buffer already on hardware. */
 157                                 break;
 158                         }
 159                 }
 160         }
 161 }
 162
 163 EXPORT_SYMBOL(drm_core_reclaim_buffers);