drm_dma.h

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    1 /* drm_dma.c -- DMA IOCTL and function support -*- linux-c -*-
    2  * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com */
    3 /*-
    4  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
    5  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
    6  * All Rights Reserved.
    7  *
    8  * Permission is hereby granted, free of charge, to any person obtaining a
    9  * copy of this software and associated documentation files (the "Software"),
   10  * to deal in the Software without restriction, including without limitation
   11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   12  * and/or sell copies of the Software, and to permit persons to whom the
   13  * Software is furnished to do so, subject to the following conditions:
   14  *
   15  * The above copyright notice and this permission notice (including the next
   16  * paragraph) shall be included in all copies or substantial portions of the
   17  * Software.
   18  *
   19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
   22  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
   23  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
   24  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
   25  * OTHER DEALINGS IN THE SOFTWARE.
   26  *
   27  * Authors:
   28  *    Rickard E. (Rik) Faith <faith@valinux.com>
   29  *    Gareth Hughes <gareth@valinux.com>
   30  *
   31  * $FreeBSD$
   32  */
   33 
   34 #include "dev/drm/drmP.h"
   35 
   36 #ifndef __HAVE_DMA_WAITQUEUE
   37 #define __HAVE_DMA_WAITQUEUE    0
   38 #endif
   39 #ifndef __HAVE_DMA_RECLAIM
   40 #define __HAVE_DMA_RECLAIM      0
   41 #endif
   42 #ifndef __HAVE_SHARED_IRQ
   43 #define __HAVE_SHARED_IRQ       0
   44 #endif
   45 
   46 #if __HAVE_DMA
   47 
   48 int DRM(dma_setup)( drm_device_t *dev )
   49 {
   50 
   51         dev->dma = DRM(calloc)(1, sizeof(*dev->dma), DRM_MEM_DRIVER);
   52         if (dev->dma == NULL)
   53                 return DRM_ERR(ENOMEM);
   54 
   55         DRM_SPININIT(dev->dma_lock, "drmdma");
   56 
   57         return 0;
   58 }
   59 
   60 void DRM(dma_takedown)(drm_device_t *dev)
   61 {
   62         drm_device_dma_t  *dma = dev->dma;
   63         int               i, j;
   64 
   65         if (dma == NULL)
   66                 return;
   67 
   68                                 /* Clear dma buffers */
   69         for (i = 0; i <= DRM_MAX_ORDER; i++) {
   70 #if __HAVE_PCI_DMA
   71                 if (dma->bufs[i].seg_count) {
   72                         DRM_DEBUG("order %d: buf_count = %d,"
   73                                   " seg_count = %d\n",
   74                                   i,
   75                                   dma->bufs[i].buf_count,
   76                                   dma->bufs[i].seg_count);
   77                         for (j = 0; j < dma->bufs[i].seg_count; j++) {
   78                                 if (dma->bufs[i].seglist[j] != 0)
   79                                         DRM(pci_free)(dev, dma->bufs[i].buf_size,
   80                                             (void *)dma->bufs[i].seglist[j],
   81                                             dma->bufs[i].seglist_bus[j]);
   82                         }
   83                         DRM(free)(dma->bufs[i].seglist,
   84                                   dma->bufs[i].seg_count
   85                                   * sizeof(*dma->bufs[0].seglist),
   86                                   DRM_MEM_SEGS);
   87                         DRM(free)(dma->bufs[i].seglist_bus,
   88                                   dma->bufs[i].seg_count
   89                                   * sizeof(*dma->bufs[0].seglist_bus),
   90                                   DRM_MEM_SEGS);
   91                 }
   92 #endif /* __HAVE_PCI_DMA */
   93 
   94                 if (dma->bufs[i].buf_count) {
   95                         for (j = 0; j < dma->bufs[i].buf_count; j++) {
   96                                 DRM(free)(dma->bufs[i].buflist[j].dev_private,
   97                                         dma->bufs[i].buflist[j].dev_priv_size,
   98                                         DRM_MEM_BUFS);
   99                         }
  100                         DRM(free)(dma->bufs[i].buflist,
  101                                   dma->bufs[i].buf_count *
  102                                   sizeof(*dma->bufs[0].buflist),
  103                                   DRM_MEM_BUFS);
  104                 }
  105         }
  106 
  107         DRM(free)(dma->buflist, dma->buf_count * sizeof(*dma->buflist),
  108             DRM_MEM_BUFS);
  109         DRM(free)(dma->pagelist, dma->page_count * sizeof(*dma->pagelist),
  110             DRM_MEM_PAGES);
  111         DRM(free)(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER);
  112         dev->dma = NULL;
  113         DRM_SPINUNINIT(dev->dma_lock);
  114 }
  115 
  116 
  117 void DRM(free_buffer)(drm_device_t *dev, drm_buf_t *buf)
  118 {
  119         if (!buf) return;
  120 
  121         buf->pending  = 0;
  122         buf->filp     = NULL;
  123         buf->used     = 0;
  124 }
  125 
  126 #if !__HAVE_DMA_RECLAIM
  127 void DRM(reclaim_buffers)(drm_device_t *dev, DRMFILE filp)
  128 {
  129         drm_device_dma_t *dma = dev->dma;
  130         int              i;
  131 
  132         if (!dma) return;
  133         for (i = 0; i < dma->buf_count; i++) {
  134                 if (dma->buflist[i]->filp == filp) {
  135                         switch (dma->buflist[i]->list) {
  136                         case DRM_LIST_NONE:
  137                                 DRM(free_buffer)(dev, dma->buflist[i]);
  138                                 break;
  139                         case DRM_LIST_WAIT:
  140                                 dma->buflist[i]->list = DRM_LIST_RECLAIM;
  141                                 break;
  142                         default:
  143                                 /* Buffer already on hardware. */
  144                                 break;
  145                         }
  146                 }
  147         }
  148 }
  149 #endif
  150 
  151 #if !__HAVE_IRQ
  152 /* This stub DRM_IOCTL_CONTROL handler is for the drivers that used to require
  153  * IRQs for DMA but no longer do.  It maintains compatibility with the X Servers
  154  * that try to use the control ioctl by simply returning success.
  155  */
  156 int DRM(control)( DRM_IOCTL_ARGS )
  157 {
  158         drm_control_t ctl;
  159 
  160         DRM_COPY_FROM_USER_IOCTL( ctl, (drm_control_t *) data, sizeof(ctl) );
  161 
  162         switch ( ctl.func ) {
  163         case DRM_INST_HANDLER:
  164         case DRM_UNINST_HANDLER:
  165                 return 0;
  166         default:
  167                 return DRM_ERR(EINVAL);
  168         }
  169 }
  170 #endif
  171 
  172 #endif /* __HAVE_DMA */

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FreeBSD/Linux Kernel Cross Reference sys/dev/drm/drm_dma.h

FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_dma.h