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 <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  */
  48 int 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  */
  78 void 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  */
 128 void 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  */
 146 void 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 }