usr/src/uts/common/io/drm/drm_scatter.c

   1 /*
   2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /* BEGIN CSTYLED */
   7
   8 /* drm_scatter.h -- IOCTLs to manage scatter/gather memory -*- linux-c -*-
   9  * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com */
  10 /*-
  11  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
  12  * All Rights Reserved.
  13  *
  14  * Permission is hereby granted, free of charge, to any person obtaining a
  15  * copy of this software and associated documentation files (the "Software"),
  16  * to deal in the Software without restriction, including without limitation
  17  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  18  * and/or sell copies of the Software, and to permit persons to whom the
  19  * Software is furnished to do so, subject to the following conditions:
  20  *
  21  * The above copyright notice and this permission notice (including the next
  22  * paragraph) shall be included in all copies or substantial portions of the
  23  * Software.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  26  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  27  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  28  * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  29  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  30  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  31  * DEALINGS IN THE SOFTWARE.
  32  *
  33  * Authors:
  34  *   Gareth Hughes <gareth@valinux.com>
  35  *   Eric Anholt <anholt@FreeBSD.org>
  36  *
  37  */
  38 /* END CSTYLED */
  39
  40 #include "drmP.h"
  41 #include <sys/gfx_private.h>
  42 #include "drm_io32.h"
  43
  44 #define DEBUG_SCATTER 0
  45
  46 #ifdef  _LP64
  47 #define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
  48 #else
  49 #define ScatterHandle(x) (unsigned int)(x)
  50 #endif
  51
  52 void
  53 drm_sg_cleanup(drm_device_t *dev, drm_sg_mem_t *entry)
  54 {
  55         int     pages = entry->pages;
  56
  57         if (entry->busaddr) {
  58                 kmem_free(entry->busaddr, sizeof (*entry->busaddr) * pages);
  59                 entry->busaddr = NULL;
  60         }
  61
  62         ASSERT(entry->umem_cookie == NULL);
  63
  64         if (entry->dmah_sg) {
  65                 drm_pci_free(dev, entry->dmah_sg);
  66                 entry->dmah_sg = NULL;
  67         }
  68
  69         if (entry->dmah_gart) {
  70                 drm_pci_free(dev, entry->dmah_gart);
  71                 entry->dmah_gart = NULL;
  72         }
  73
  74         if (entry) {
  75                 drm_free(entry, sizeof (drm_sg_mem_t), DRM_MEM_SGLISTS);
  76                 entry = NULL;
  77         }
  78 }
  79
  80 /*ARGSUSED*/
  81 int
  82 drm_sg_alloc(DRM_IOCTL_ARGS)
  83 {
  84         DRM_DEVICE;
  85         unsigned long pages;
  86         drm_sg_mem_t            *entry;
  87         drm_dma_handle_t        *dmah;
  88         drm_scatter_gather_t request;
  89
  90         DRM_DEBUG("%s\n", "drm_sg_alloc");
  91
  92         if (dev->sg)
  93                 return (EINVAL);
  94
  95 #ifdef  _MULTI_DATAMODEL
  96         if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
  97                 drm_scatter_gather_32_t request32;
  98
  99                 DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
 100                     sizeof (request32));
 101                 request.size = request32.size;
 102                 request.handle = request32.handle;
 103         } else
 104 #endif
 105                 DRM_COPYFROM_WITH_RETURN(&request, (void *)data,
 106                     sizeof (request));
 107
 108         pages = btopr(request.size);
 109         DRM_DEBUG("sg size=%ld pages=%ld\n", request.size, pages);
 110         entry = kmem_zalloc(sizeof (*entry), KM_SLEEP);
 111         entry->pages = (int)pages;
 112         dmah = drm_pci_alloc(dev, ptob(pages), 4096, 0xfffffffful, pages);
 113         if (dmah == NULL)
 114                 goto err_exit;
 115         entry->busaddr = (void *)kmem_zalloc(sizeof (*entry->busaddr) *
 116             pages, KM_SLEEP);
 117
 118         entry->handle = ScatterHandle((unsigned long)dmah->vaddr);
 119         entry->virtual = (void *)dmah->vaddr;
 120         request.handle = entry->handle;
 121         entry->dmah_sg = dmah;
 122 #ifdef  _MULTI_DATAMODEL
 123         if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
 124                 drm_scatter_gather_32_t data32;
 125
 126                 data32.size = (uint32_t)request.size;
 127                 data32.handle = (uint32_t)request.handle;
 128
 129                 DRM_COPYTO_WITH_RETURN((void *)data, &data32,
 130                     sizeof (data32));
 131         } else
 132 #endif
 133                 DRM_COPYTO_WITH_RETURN((void *)data, &request,
 134                     sizeof (request));
 135
 136         DRM_LOCK();
 137         if (dev->sg) {
 138                 DRM_UNLOCK();
 139                 drm_sg_cleanup(dev, entry);
 140                 return (EINVAL);
 141         }
 142         dev->sg = entry;
 143         DRM_UNLOCK();
 144
 145         return (0);
 146
 147 err_exit:
 148         drm_sg_cleanup(dev, entry);
 149         return (ENOMEM);
 150 }
 151
 152 /*ARGSUSED*/
 153 int
 154 drm_sg_free(DRM_IOCTL_ARGS)
 155 {
 156         DRM_DEVICE;
 157         drm_scatter_gather_t request;
 158         drm_sg_mem_t *entry;
 159
 160 #ifdef  _MULTI_DATAMODEL
 161         if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
 162                 drm_scatter_gather_32_t request32;
 163
 164                 DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
 165                     sizeof (request32));
 166                 request.size = request32.size;
 167                 request.handle = request32.handle;
 168         } else
 169 #endif
 170                 DRM_COPYFROM_WITH_RETURN(&request, (void *)data,
 171                     sizeof (request));
 172
 173         DRM_LOCK();
 174         entry = dev->sg;
 175         dev->sg = NULL;
 176         DRM_UNLOCK();
 177
 178         if (!entry || entry->handle != request.handle)
 179                 return (EINVAL);
 180
 181         drm_sg_cleanup(dev, entry);
 182
 183         return (0);
 184 }