drivers/char/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 "drmP.h"
  37
  38 /**
  39  * Initialize the DMA data.
  40  *
  41  * \param dev DRM device.
  42  * \return zero on success or a negative value on failure.
  43  *
  44  * Allocate and initialize a drm_device_dma structure.
  45  */
  46 int drm_dma_setup(drm_device_t * dev)
  47 {
  48         int i;
  49
  50         dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
  51         if (!dev->dma)
  52                 return -ENOMEM;
  53
  54         memset(dev->dma, 0, sizeof(*dev->dma));
  55
  56         for (i = 0; i <= DRM_MAX_ORDER; i++)
  57                 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
  58
  59         return 0;
  60 }
  61
  62 /**
  63  * Cleanup the DMA resources.
  64  *
  65  * \param dev DRM device.
  66  *
  67  * Free all pages associated with DMA buffers, the buffers and pages lists, and
  68  * finally the the drm_device::dma structure itself.
  69  */
  70 void drm_dma_takedown(drm_device_t * dev)
  71 {
  72         drm_device_dma_t *dma = dev->dma;
  73         int i, j;
  74
  75         if (!dma)
  76                 return;
  77
  78         /* Clear dma buffers */
  79         for (i = 0; i <= DRM_MAX_ORDER; i++) {
  80                 if (dma->bufs[i].seg_count) {
  81                         DRM_DEBUG("order %d: buf_count = %d,"
  82                                   " seg_count = %d\n",
  83                                   i,
  84                                   dma->bufs[i].buf_count,
  85                                   dma->bufs[i].seg_count);
  86                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
  87                                 if (dma->bufs[i].seglist[j]) {
  88                                         drm_pci_free(dev, dma->bufs[i].seglist[j]);
  89                                 }
  90                         }
  91                         drm_free(dma->bufs[i].seglist,
  92                                  dma->bufs[i].seg_count
  93                                  * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
  94                 }
  95                 if (dma->bufs[i].buf_count) {
  96                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
  97                                 if (dma->bufs[i].buflist[j].dev_private) {
  98                                         drm_free(dma->bufs[i].buflist[j].
  99                                                  dev_private,
 100                                                  dma->bufs[i].buflist[j].
 101                                                  dev_priv_size, DRM_MEM_BUFS);
 102                                 }
 103                         }
 104                         drm_free(dma->bufs[i].buflist,
 105                                  dma->bufs[i].buf_count *
 106                                  sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
 107                 }
 108         }
 109
 110         if (dma->buflist) {
 111                 drm_free(dma->buflist,
 112                          dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
 113         }
 114
 115         if (dma->pagelist) {
 116                 drm_free(dma->pagelist,
 117                          dma->page_count * sizeof(*dma->pagelist),
 118                          DRM_MEM_PAGES);
 119         }
 120         drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
 121         dev->dma = NULL;
 122 }
 123
 124 /**
 125  * Free a buffer.
 126  *
 127  * \param dev DRM device.
 128  * \param buf buffer to free.
 129  *
 130  * Resets the fields of \p buf.
 131  */
 132 void drm_free_buffer(drm_device_t * dev, drm_buf_t * buf)
 133 {
 134         if (!buf)
 135                 return;
 136
 137         buf->waiting = 0;
 138         buf->pending = 0;
 139         buf->filp = NULL;
 140         buf->used = 0;
 141
 142         if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
 143             && waitqueue_active(&buf->dma_wait)) {
 144                 wake_up_interruptible(&buf->dma_wait);
 145         }
 146 }
 147
 148 /**
 149  * Reclaim the buffers.
 150  *
 151  * \param filp file pointer.
 152  *
 153  * Frees each buffer associated with \p filp not already on the hardware.
 154  */
 155 void drm_core_reclaim_buffers(drm_device_t * dev, struct file *filp)
 156 {
 157         drm_device_dma_t *dma = dev->dma;
 158         int i;
 159
 160         if (!dma)
 161                 return;
 162         for (i = 0; i < dma->buf_count; i++) {
 163                 if (dma->buflist[i]->filp == filp) {
 164                         switch (dma->buflist[i]->list) {
 165                         case DRM_LIST_NONE:
 166                                 drm_free_buffer(dev, dma->buflist[i]);
 167                                 break;
 168                         case DRM_LIST_WAIT:
 169                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
 170                                 break;
 171                         default:
 172                                 /* Buffer already on hardware. */
 173                                 break;
 174                         }
 175                 }
 176         }
 177 }
 178
 179 EXPORT_SYMBOL(drm_core_reclaim_buffers);