sys/dev/drm/drm_scatter.c

   1 /*-
   2  * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org>
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * $FreeBSD: src/sys/dev/drm2/drm_scatter.c,v 1.1 2012/05/22 11:07:44 kib Exp $
  25  */
  26
  27 /** @file drm_scatter.c
  28  * Allocation of memory for scatter-gather mappings by the graphics chip.
  29  * The memory allocated here is then made into an aperture in the card
  30  * by mapping the pages into the GART.
  31  */
  32
  33 #include <drm/drmP.h>
  34 #include "drm_legacy.h"
  35
  36 static void drm_sg_cleanup(struct drm_sg_mem * entry)
  37 {
  38         if (entry == NULL)
  39                 return;
  40
  41         if (entry->vaddr != 0)
  42                 kmem_free(&kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages));
  43
  44         kfree(entry->busaddr);
  45         kfree(entry);
  46 }
  47
  48 void drm_legacy_sg_cleanup(struct drm_device *dev)
  49 {
  50         if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg &&
  51             !drm_core_check_feature(dev, DRIVER_MODESET)) {
  52                 drm_sg_cleanup(dev->sg);
  53                 dev->sg = NULL;
  54         }
  55 }
  56
  57 int drm_legacy_sg_alloc(struct drm_device *dev, void *data,
  58                         struct drm_file *file_priv)
  59 {
  60         struct drm_scatter_gather *request = data;
  61         struct drm_sg_mem *entry;
  62         vm_size_t size;
  63         vm_pindex_t pindex;
  64
  65         if (dev->sg)
  66                 return -EINVAL;
  67
  68         DRM_DEBUG("request size=%ld\n", request->size);
  69
  70         entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO);
  71
  72         size = round_page(request->size);
  73         entry->pages = OFF_TO_IDX(size);
  74         entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr),
  75             M_DRM, M_WAITOK | M_ZERO);
  76
  77         entry->vaddr = kmem_alloc_attr(&kernel_map, size,
  78                                        VM_SUBSYS_DRM_SCAT, M_WAITOK | M_ZERO,
  79                                        0, BUS_SPACE_MAXADDR_32BIT,
  80                                        VM_MEMATTR_WRITE_COMBINING);
  81         if (entry->vaddr == 0) {
  82                 drm_sg_cleanup(entry);
  83                 return (-ENOMEM);
  84         }
  85
  86         for(pindex = 0; pindex < entry->pages; pindex++) {
  87                 entry->busaddr[pindex] =
  88                     vtophys(entry->vaddr + IDX_TO_OFF(pindex));
  89         }
  90
  91         DRM_LOCK(dev);
  92         if (dev->sg) {
  93                 DRM_UNLOCK(dev);
  94                 drm_sg_cleanup(entry);
  95                 return (-EINVAL);
  96         }
  97         dev->sg = entry;
  98         DRM_UNLOCK(dev);
  99
 100         request->handle = entry->vaddr;
 101
 102         DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n",
 103             entry->pages, (uintmax_t)entry->vaddr,
 104             *(unsigned long *)entry->vaddr);
 105
 106         return (0);
 107 }
 108
 109 int drm_legacy_sg_free(struct drm_device *dev, void *data,
 110                        struct drm_file *file_priv)
 111 {
 112         struct drm_scatter_gather *request = data;
 113         struct drm_sg_mem *entry;
 114
 115         DRM_LOCK(dev);
 116         entry = dev->sg;
 117         dev->sg = NULL;
 118         DRM_UNLOCK(dev);
 119
 120         if (!entry || entry->vaddr != request->handle)
 121                 return (-EINVAL);
 122
 123         DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr);
 124
 125         drm_sg_cleanup(entry);
 126
 127         return (0);
 128 }