LXR linux/drivers/gpu/drm/drm

   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 <linux/export.h>
  37#include <drm/drmP.h>
  38#include "drm_legacy.h"
  39
  40/**
  41 * Initialize the DMA data.
  42 *
  43 * \param dev DRM device.
  44 * \return zero on success or a negative value on failure.
  45 *
  46 * Allocate and initialize a drm_device_dma structure.
  47 */
  48int drm_legacy_dma_setup(struct drm_device *dev)
  49{
  50        int i;
  51
  52        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
  53            !drm_core_check_feature(dev, DRIVER_LEGACY))
  54                return 0;
  55
  56        dev->buf_use = 0;
  57        atomic_set(&dev->buf_alloc, 0);
  58
  59        dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
  60        if (!dev->dma)
  61                return -ENOMEM;
  62
  63        for (i = 0; i <= DRM_MAX_ORDER; i++)
  64                memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  65
  66        return 0;
  67}
  68
  69/**
  70 * Cleanup the DMA resources.
  71 *
  72 * \param dev DRM device.
  73 *
  74 * Free all pages associated with DMA buffers, the buffers and pages lists, and
  75 * finally the drm_device::dma structure itself.
  76 */
  77void drm_legacy_dma_takedown(struct drm_device *dev)
  78{
  79        struct drm_device_dma *dma = dev->dma;
  80        int i, j;
  81
  82        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
  83            !drm_core_check_feature(dev, DRIVER_LEGACY))
  84                return;
  85
  86        if (!dma)
  87                return;
  88
  89        /* Clear dma buffers */
  90        for (i = 0; i <= DRM_MAX_ORDER; i++) {
  91                if (dma->bufs[i].seg_count) {
  92                        DRM_DEBUG("order %d: buf_count = %d,"
  93                                  " seg_count = %d\n",
  94                                  i,
  95                                  dma->bufs[i].buf_count,
  96                                  dma->bufs[i].seg_count);
  97                        for (j = 0; j < dma->bufs[i].seg_count; j++) {
  98                                if (dma->bufs[i].seglist[j]) {
  99                                        drm_pci_free(dev, dma->bufs[i].seglist[j]);
 100                                }
 101                        }
 102                        kfree(dma->bufs[i].seglist);
 103                }
 104                if (dma->bufs[i].buf_count) {
 105                        for (j = 0; j < dma->bufs[i].buf_count; j++) {
 106                                kfree(dma->bufs[i].buflist[j].dev_private);
 107                        }
 108                        kfree(dma->bufs[i].buflist);
 109                }
 110        }
 111
 112        kfree(dma->buflist);
 113        kfree(dma->pagelist);
 114        kfree(dev->dma);
 115        dev->dma = NULL;
 116}
 117
 118/**
 119 * Free a buffer.
 120 *
 121 * \param dev DRM device.
 122 * \param buf buffer to free.
 123 *
 124 * Resets the fields of \p buf.
 125 */
 126void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 127{
 128        if (!buf)
 129                return;
 130
 131        buf->waiting = 0;
 132        buf->pending = 0;
 133        buf->file_priv = NULL;
 134        buf->used = 0;
 135}
 136
 137/**
 138 * Reclaim the buffers.
 139 *
 140 * \param file_priv DRM file private.
 141 *
 142 * Frees each buffer associated with \p file_priv not already on the hardware.
 143 */
 144void drm_legacy_reclaim_buffers(struct drm_device *dev,
 145                                struct drm_file *file_priv)
 146{
 147        struct drm_device_dma *dma = dev->dma;
 148        int i;
 149
 150        if (!dma)
 151                return;
 152        for (i = 0; i < dma->buf_count; i++) {
 153                if (dma->buflist[i]->file_priv == file_priv) {
 154                        switch (dma->buflist[i]->list) {
 155                        case DRM_LIST_NONE:
 156                                drm_legacy_free_buffer(dev, dma->buflist[i]);
 157                                break;
 158                        case DRM_LIST_WAIT:
 159                                dma->buflist[i]->list = DRM_LIST_RECLAIM;
 160                                break;
 161                        default:
 162                                /* Buffer already on hardware. */
 163                                break;
 164                        }
 165                }
 166        }
 167}
 168