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
  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  */
  47 int 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  */
  69 void 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  */
 114 void 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  */
 132 void 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
 157 EXPORT_SYMBOL(drm_core_reclaim_buffers);