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
  38#include <drm/drm_drv.h>
  39#include <drm/drm_pci.h>
  40#include <drm/drm_print.h>
  41
  42#include "drm_legacy.h"
  43
  44/**
  45 * Initialize the DMA data.
  46 *
  47 * \param dev DRM device.
  48 * \return zero on success or a negative value on failure.
  49 *
  50 * Allocate and initialize a drm_device_dma structure.
  51 */
  52int drm_legacy_dma_setup(struct drm_device *dev)
  53{
  54        int i;
  55
  56        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
  57            !drm_core_check_feature(dev, DRIVER_LEGACY))
  58                return 0;
  59
  60        dev->buf_use = 0;
  61        atomic_set(&dev->buf_alloc, 0);
  62
  63        dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
  64        if (!dev->dma)
  65                return -ENOMEM;
  66
  67        for (i = 0; i <= DRM_MAX_ORDER; i++)
  68                memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  69
  70        return 0;
  71}
  72
  73/**
  74 * Cleanup the DMA resources.
  75 *
  76 * \param dev DRM device.
  77 *
  78 * Free all pages associated with DMA buffers, the buffers and pages lists, and
  79 * finally the drm_device::dma structure itself.
  80 */
  81void drm_legacy_dma_takedown(struct drm_device *dev)
  82{
  83        struct drm_device_dma *dma = dev->dma;
  84        int i, j;
  85
  86        if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
  87            !drm_core_check_feature(dev, DRIVER_LEGACY))
  88                return;
  89
  90        if (!dma)
  91                return;
  92
  93        /* Clear dma buffers */
  94        for (i = 0; i <= DRM_MAX_ORDER; i++) {
  95                if (dma->bufs[i].seg_count) {
  96                        DRM_DEBUG("order %d: buf_count = %d,"
  97                                  " seg_count = %d\n",
  98                                  i,
  99                                  dma->bufs[i].buf_count,
 100                                  dma->bufs[i].seg_count);
 101                        for (j = 0; j < dma->bufs[i].seg_count; j++) {
 102                                if (dma->bufs[i].seglist[j]) {
 103                                        drm_pci_free(dev, dma->bufs[i].seglist[j]);
 104                                }
 105                        }
 106                        kfree(dma->bufs[i].seglist);
 107                }
 108                if (dma->bufs[i].buf_count) {
 109                        for (j = 0; j < dma->bufs[i].buf_count; j++) {
 110                                kfree(dma->bufs[i].buflist[j].dev_private);
 111                        }
 112                        kfree(dma->bufs[i].buflist);
 113                }
 114        }
 115
 116        kfree(dma->buflist);
 117        kfree(dma->pagelist);
 118        kfree(dev->dma);
 119        dev->dma = NULL;
 120}
 121
 122/**
 123 * Free a buffer.
 124 *
 125 * \param dev DRM device.
 126 * \param buf buffer to free.
 127 *
 128 * Resets the fields of \p buf.
 129 */
 130void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
 131{
 132        if (!buf)
 133                return;
 134
 135        buf->waiting = 0;
 136        buf->pending = 0;
 137        buf->file_priv = NULL;
 138        buf->used = 0;
 139}
 140
 141/**
 142 * Reclaim the buffers.
 143 *
 144 * \param file_priv DRM file private.
 145 *
 146 * Frees each buffer associated with \p file_priv not already on the hardware.
 147 */
 148void drm_legacy_reclaim_buffers(struct drm_device *dev,
 149                                struct drm_file *file_priv)
 150{
 151        struct drm_device_dma *dma = dev->dma;
 152        int i;
 153
 154        if (!dma)
 155                return;
 156        for (i = 0; i < dma->buf_count; i++) {
 157                if (dma->buflist[i]->file_priv == file_priv) {
 158                        switch (dma->buflist[i]->list) {
 159                        case DRM_LIST_NONE:
 160                                drm_legacy_free_buffer(dev, dma->buflist[i]);
 161                                break;
 162                        case DRM_LIST_WAIT:
 163                                dma->buflist[i]->list = DRM_LIST_RECLAIM;
 164                                break;
 165                        default:
 166                                /* Buffer already on hardware. */
 167                                break;
 168                        }
 169                }
 170        }
 171}
 172