sys/dev/drm/drm_scatter.c

   1 /*-
   2  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
   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  * Authors:
  25  *   Gareth Hughes <gareth@valinux.com>
  26  *   Eric Anholt <anholt@FreeBSD.org>
  27  *
  28  */
  29
  30 /** @file drm_scatter.c
  31  * Allocation of memory for scatter-gather mappings by the graphics chip.
  32  *
  33  * The memory allocated here is then made into an aperture in the card
  34  * by drm_ati_pcigart_init().
  35  */
  36
  37 #include "dev/drm/drmP.h"
  38
  39 static void drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs,
  40                             int nsegs, int error);
  41
  42 int
  43 drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request)
  44 {
  45         struct drm_sg_mem *entry;
  46         struct drm_dma_handle *dmah;
  47         unsigned long pages;
  48         int ret;
  49
  50         if (dev->sg)
  51                 return EINVAL;
  52
  53         entry = malloc(sizeof(*entry), DRM_MEM_SGLISTS, M_WAITOK | M_ZERO);
  54         if (!entry)
  55                 return ENOMEM;
  56
  57         pages = round_page(request->size) / PAGE_SIZE;
  58         DRM_DEBUG("sg size=%ld pages=%ld\n", request->size, pages);
  59
  60         entry->pages = pages;
  61
  62         entry->busaddr = malloc(pages * sizeof(*entry->busaddr), DRM_MEM_PAGES,
  63             M_WAITOK | M_ZERO);
  64         if (!entry->busaddr) {
  65                 free(entry, DRM_MEM_SGLISTS);
  66                 return ENOMEM;
  67         }
  68
  69         dmah = malloc(sizeof(struct drm_dma_handle), DRM_MEM_DMA,
  70             M_ZERO | M_NOWAIT);
  71         if (dmah == NULL) {
  72                 free(entry->busaddr, DRM_MEM_PAGES);
  73                 free(entry, DRM_MEM_SGLISTS);
  74                 return ENOMEM;
  75         }
  76
  77         ret = bus_dma_tag_create(NULL, PAGE_SIZE, 0, /* tag, align, boundary */
  78             BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
  79             NULL, NULL, /* filtfunc, filtfuncargs */
  80             request->size, pages, /* maxsize, nsegs */
  81             PAGE_SIZE, 0, /* maxsegsize, flags */
  82             &dmah->tag);
  83         if (ret != 0) {
  84                 free(dmah, DRM_MEM_DMA);
  85                 free(entry->busaddr, DRM_MEM_PAGES);
  86                 free(entry, DRM_MEM_SGLISTS);
  87                 return ENOMEM;
  88         }
  89
  90         /* XXX BUS_DMA_NOCACHE */
  91         ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
  92             BUS_DMA_WAITOK | BUS_DMA_ZERO , &dmah->map);
  93         if (ret != 0) {
  94                 bus_dma_tag_destroy(dmah->tag);
  95                 free(dmah, DRM_MEM_DMA);
  96                 free(entry->busaddr, DRM_MEM_PAGES);
  97                 free(entry, DRM_MEM_SGLISTS);
  98                 return ENOMEM;
  99         }
 100
 101         ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr,
 102             request->size, drm_sg_alloc_cb, entry, BUS_DMA_NOWAIT);
 103         if (ret != 0) {
 104                 bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
 105                 bus_dma_tag_destroy(dmah->tag);
 106                 free(dmah, DRM_MEM_DMA);
 107                 free(entry->busaddr, DRM_MEM_PAGES);
 108                 free(entry, DRM_MEM_SGLISTS);
 109                 return ENOMEM;
 110         }
 111
 112         entry->dmah = dmah;
 113         entry->handle = (unsigned long)dmah->vaddr;
 114
 115         DRM_DEBUG("sg alloc handle  = %08lx\n", entry->handle);
 116
 117         entry->virtual = (void *)entry->handle;
 118         request->handle = entry->handle;
 119
 120         DRM_LOCK();
 121         if (dev->sg) {
 122                 DRM_UNLOCK();
 123                 drm_sg_cleanup(entry);
 124                 return EINVAL;
 125         }
 126         dev->sg = entry;
 127         DRM_UNLOCK();
 128
 129         return 0;
 130 }
 131
 132 static void
 133 drm_sg_alloc_cb(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
 134 {
 135         struct drm_sg_mem *entry = arg;
 136         int i;
 137
 138         if (error != 0)
 139             return;
 140
 141         for(i = 0 ; i < nsegs ; i++) {
 142                 entry->busaddr[i] = segs[i].ds_addr;
 143         }
 144 }
 145
 146 int
 147 drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
 148                    struct drm_file *file_priv)
 149 {
 150         struct drm_scatter_gather *request = data;
 151
 152         DRM_DEBUG("\n");
 153
 154         return drm_sg_alloc(dev, request);
 155 }
 156
 157 void
 158 drm_sg_cleanup(struct drm_sg_mem *entry)
 159 {
 160         struct drm_dma_handle *dmah = entry->dmah;
 161
 162         bus_dmamap_unload(dmah->tag, dmah->map);
 163         bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
 164         bus_dma_tag_destroy(dmah->tag);
 165         free(dmah, DRM_MEM_DMA);
 166         free(entry->busaddr, DRM_MEM_PAGES);
 167         free(entry, DRM_MEM_SGLISTS);
 168 }
 169
 170 int
 171 drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv)
 172 {
 173         struct drm_scatter_gather *request = data;
 174         struct drm_sg_mem *entry;
 175
 176         DRM_LOCK();
 177         entry = dev->sg;
 178         dev->sg = NULL;
 179         DRM_UNLOCK();
 180
 181         if (!entry || entry->handle != request->handle)
 182                 return EINVAL;
 183
 184         DRM_DEBUG("sg free virtual = 0x%lx\n", entry->handle);
 185
 186         drm_sg_cleanup(entry);
 187
 188         return 0;
 189 }