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_MODESET)) {
  54                return 0;
  55        }
  56
  57        dev->buf_use = 0;
  58        atomic_set(&dev->buf_alloc, 0);
  59
  60        dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
  61        if (!dev->dma)
  62                return -ENOMEM;
  63
  64        for (i = 0; i <= DRM_MAX_ORDER; i++)
  65                memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  66
  67        return 0;
  68}
  69
  70/**
  71 * Cleanup the DMA resources.
  72 *
  73 * \param dev DRM device.
  74 *
  75 * Free all pages associated with DMA buffers, the buffers and pages lists, and
  76 * finally the drm_device::dma structure itself.
  77 */
  78void drm_legacy_dma_takedown(struct drm_device *dev)
  79{
  80        struct drm_device_dma *dma = dev->dma;
  81        int i, j;
  82
  83        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
  84            drm_core_check_feature(dev, DRIVER_MODESET)) {
  85                return;
  86        }
  87
  88        if (!dma)
  89                return;
  90
  91        /* Clear dma buffers */
  92        for (i = 0; i <= DRM_MAX_ORDER; i++) {
  93                if (dma->bufs[i].seg_count) {
  94                        DRM_DEBUG("order %d: buf_count = %d,"
  95                                  " seg_count = %d\n",
  96                                  i,
  97                                  dma->bufs[i].buf_count,
  98                                  dma->bufs[i].seg_count);
  99                        for (j = 0; j < dma->bufs[i].seg_count; j++) {
 100                                if (dma->bufs[i].seglist[j]) {
 101                                        drm_pci_free(dev, dma->bufs[i].seglist[j]);
 102                                }
 103                        }
 104                        kfree(dma->bufs[i].seglist);
 105                }
 106                if (dma->bufs[i].buf_count) {
 107                        for (j = 0; j < dma->bufs[i].buf_count; j++) {
 108                                kfree(dma->bufs[i].buflist[j].dev_private);
 109                        }
 110                        kfree(dma->bufs[i].buflist);
 111                }
 112        }
 113
 114        kfree(dma->buflist);
 115        kfree(dma->pagelist);
 116        kfree(dev->dma);
 117        dev->dma = NULL;
 118}
 119
 120/**
 121 * Free a buffer.
 122 *
 123 * \param dev DRM device.
 124 * \param buf buffer to free.
 125 *
 126 * Resets the fields of \p buf.
 127 */
 128void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 129{
 130        if (!buf)
 131                return;
 132
 133        buf->waiting = 0;
 134        buf->pending = 0;
 135        buf->file_priv = NULL;
 136        buf->used = 0;
 137}
 138
 139/**
 140 * Reclaim the buffers.
 141 *
 142 * \param file_priv DRM file private.
 143 *
 144 * Frees each buffer associated with \p file_priv not already on the hardware.
 145 */
 146void drm_legacy_reclaim_buffers(struct drm_device *dev,
 147                                struct drm_file *file_priv)
 148{
 149        struct drm_device_dma *dma = dev->dma;
 150        int i;
 151
 152        if (!dma)
 153                return;
 154        for (i = 0; i < dma->buf_count; i++) {
 155                if (dma->buflist[i]->file_priv == file_priv) {
 156                        switch (dma->buflist[i]->list) {
 157                        case DRM_LIST_NONE:
 158                                drm_legacy_free_buffer(dev, dma->buflist[i]);
 159                                break;
 160                        case DRM_LIST_WAIT:
 161                                dma->buflist[i]->list = DRM_LIST_RECLAIM;
 162                                break;
 163                        default:
 164                                /* Buffer already on hardware. */
 165                                break;
 166                        }
 167                }
 168        }
 169}
 170