sys/dev/drm/drm_dma.c

   1 /*-
   2  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
   3  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Rickard E. (Rik) Faith <faith@valinux.com>
  27  *    Gareth Hughes <gareth@valinux.com>
  28  *
  29  */
  30
  31 /** @file drm_dma.c
  32  * Support code for DMA buffer management.
  33  *
  34  * The implementation used to be significantly more complicated, but the
  35  * complexity has been moved into the drivers as different buffer management
  36  * schemes evolved.
  37  */
  38
  39 #include "dev/drm/drmP.h"
  40
  41 int drm_dma_setup(struct drm_device *dev)
  42 {
  43
  44         dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
  45         if (dev->dma == NULL)
  46                 return ENOMEM;
  47
  48         DRM_SPININIT(&dev->dma_lock, "drmdma");
  49
  50         return 0;
  51 }
  52
  53 void drm_dma_takedown(struct drm_device *dev)
  54 {
  55         drm_device_dma_t  *dma = dev->dma;
  56         int               i, j;
  57
  58         if (dma == NULL)
  59                 return;
  60
  61         /* Clear dma buffers */
  62         for (i = 0; i <= DRM_MAX_ORDER; i++) {
  63                 if (dma->bufs[i].seg_count) {
  64                         DRM_DEBUG("order %d: buf_count = %d,"
  65                             " seg_count = %d\n", i, dma->bufs[i].buf_count,
  66                             dma->bufs[i].seg_count);
  67                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
  68                                 drm_pci_free(dev, dma->bufs[i].seglist[j]);
  69                         }
  70                         free(dma->bufs[i].seglist, DRM_MEM_SEGS);
  71                 }
  72
  73                 if (dma->bufs[i].buf_count) {
  74                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
  75                                 free(dma->bufs[i].buflist[j].dev_private,
  76                                     DRM_MEM_BUFS);
  77                         }
  78                         free(dma->bufs[i].buflist, DRM_MEM_BUFS);
  79                 }
  80         }
  81
  82         free(dma->buflist, DRM_MEM_BUFS);
  83         free(dma->pagelist, DRM_MEM_PAGES);
  84         free(dev->dma, DRM_MEM_DRIVER);
  85         dev->dma = NULL;
  86         DRM_SPINUNINIT(&dev->dma_lock);
  87 }
  88
  89
  90 void drm_free_buffer(struct drm_device *dev, drm_buf_t *buf)
  91 {
  92         if (!buf)
  93                 return;
  94
  95         buf->pending  = 0;
  96         buf->file_priv= NULL;
  97         buf->used     = 0;
  98 }
  99
 100 void drm_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv)
 101 {
 102         drm_device_dma_t *dma = dev->dma;
 103         int              i;
 104
 105         if (!dma)
 106                 return;
 107
 108         for (i = 0; i < dma->buf_count; i++) {
 109                 if (dma->buflist[i]->file_priv == file_priv) {
 110                         switch (dma->buflist[i]->list) {
 111                         case DRM_LIST_NONE:
 112                                 drm_free_buffer(dev, dma->buflist[i]);
 113                                 break;
 114                         case DRM_LIST_WAIT:
 115                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 116                                 break;
 117                         default:
 118                                 /* Buffer already on hardware. */
 119                                 break;
 120                         }
 121                 }
 122         }
 123 }
 124
 125 /* Call into the driver-specific DMA handler */
 126 int drm_dma(struct drm_device *dev, void *data, struct drm_file *file_priv)
 127 {
 128
 129         if (dev->driver->dma_ioctl) {
 130                 /* shared code returns -errno */
 131                 return -dev->driver->dma_ioctl(dev, data, file_priv);
 132         } else {
 133                 DRM_DEBUG("DMA ioctl on driver with no dma handler\n");
 134                 return EINVAL;
 135         }
 136 }