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
  39/**
  40 * Initialize the DMA data.
  41 *
  42 * \param dev DRM device.
  43 * \return zero on success or a negative value on failure.
  44 *
  45 * Allocate and initialize a drm_device_dma structure.
  46 */
  47int drm_dma_setup(struct drm_device *dev)
  48{
  49        int i;
  50
  51        dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
  52        if (!dev->dma)
  53                return -ENOMEM;
  54
  55        for (i = 0; i <= DRM_MAX_ORDER; i++)
  56                memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  57
  58        return 0;
  59}
  60
  61/**
  62 * Cleanup the DMA resources.
  63 *
  64 * \param dev DRM device.
  65 *
  66 * Free all pages associated with DMA buffers, the buffers and pages lists, and
  67 * finally the drm_device::dma structure itself.
  68 */
  69void drm_dma_takedown(struct drm_device *dev)
  70{
  71        struct drm_device_dma *dma = dev->dma;
  72        int i, j;
  73
  74        if (!dma)
  75                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_pci_free(dev, dma->bufs[i].seglist[j]);
  88                                }
  89                        }
  90                        kfree(dma->bufs[i].seglist);
  91                }
  92                if (dma->bufs[i].buf_count) {
  93                        for (j = 0; j < dma->bufs[i].buf_count; j++) {
  94                                kfree(dma->bufs[i].buflist[j].dev_private);
  95                        }
  96                        kfree(dma->bufs[i].buflist);
  97                }
  98        }
  99
 100        kfree(dma->buflist);
 101        kfree(dma->pagelist);
 102        kfree(dev->dma);
 103        dev->dma = NULL;
 104}
 105
 106/**
 107 * Free a buffer.
 108 *
 109 * \param dev DRM device.
 110 * \param buf buffer to free.
 111 *
 112 * Resets the fields of \p buf.
 113 */
 114void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 115{
 116        if (!buf)
 117                return;
 118
 119        buf->waiting = 0;
 120        buf->pending = 0;
 121        buf->file_priv = NULL;
 122        buf->used = 0;
 123}
 124
 125/**
 126 * Reclaim the buffers.
 127 *
 128 * \param file_priv DRM file private.
 129 *
 130 * Frees each buffer associated with \p file_priv not already on the hardware.
 131 */
 132void drm_core_reclaim_buffers(struct drm_device *dev,
 133                              struct drm_file *file_priv)
 134{
 135        struct drm_device_dma *dma = dev->dma;
 136        int i;
 137
 138        if (!dma)
 139                return;
 140        for (i = 0; i < dma->buf_count; i++) {
 141                if (dma->buflist[i]->file_priv == file_priv) {
 142                        switch (dma->buflist[i]->list) {
 143                        case DRM_LIST_NONE:
 144                                drm_free_buffer(dev, dma->buflist[i]);
 145                                break;
 146                        case DRM_LIST_WAIT:
 147                                dma->buflist[i]->list = DRM_LIST_RECLAIM;
 148                                break;
 149                        default:
 150                                /* Buffer already on hardware. */
 151                                break;
 152                        }
 153                }
 154        }
 155}
 156
 157EXPORT_SYMBOL(drm_core_reclaim_buffers);
 158