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 <linux/pci.h>
  38
  39 #include <drm/drm_drv.h>
  40 #include <drm/drm_print.h>
  41
  42 #include "drm_legacy.h"
  43
  44 /**
  45  * drm_legacy_dma_setup() - Initialize the DMA data.
  46  *
  47  * @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  */
  52 int 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  * drm_legacy_dma_takedown() - Cleanup the DMA resources.
  75  *
  76  * @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  */
  81 void 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  * drm_legacy_free_buffer() - Free a buffer.
 124  *
 125  * @dev: DRM device.
 126  * @buf: buffer to free.
 127  *
 128  * Resets the fields of \p buf.
 129  */
 130 void 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  * drm_legacy_reclaim_buffers() - Reclaim the buffers.
 143  *
 144  * @dev: DRM device.
 145  * @file_priv: DRM file private.
 146  *
 147  * Frees each buffer associated with \p file_priv not already on the hardware.
 148  */
 149 void drm_legacy_reclaim_buffers(struct drm_device *dev,
 150                                 struct drm_file *file_priv)
 151 {
 152         struct drm_device_dma *dma = dev->dma;
 153         int i;
 154
 155         if (!dma)
 156                 return;
 157         for (i = 0; i < dma->buf_count; i++) {
 158                 if (dma->buflist[i]->file_priv == file_priv) {
 159                         switch (dma->buflist[i]->list) {
 160                         case DRM_LIST_NONE:
 161                                 drm_legacy_free_buffer(dev, dma->buflist[i]);
 162                                 break;
 163                         case DRM_LIST_WAIT:
 164                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 165                                 break;
 166                         default:
 167                                 /* Buffer already on hardware. */
 168                                 break;
 169                         }
 170                 }
 171         }
 172 }