LXR linux/drivers/gpu/drm/drm

   1/**
   2 * \file drm_memory.c
   3 * Memory management wrappers for DRM
   4 *
   5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
   6 * \author Gareth Hughes <gareth@valinux.com>
   7 */
   8
   9/*
  10 * Created: Thu Feb  4 14:00:34 1999 by faith@valinux.com
  11 *
  12 * Copyright 1999 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 <linux/highmem.h>
  37#include <linux/export.h>
  38#include <drm/drmP.h>
  39
  40#if __OS_HAS_AGP
  41static void *agp_remap(unsigned long offset, unsigned long size,
  42                       struct drm_device * dev)
  43{
  44        unsigned long i, num_pages =
  45            PAGE_ALIGN(size) / PAGE_SIZE;
  46        struct drm_agp_mem *agpmem;
  47        struct page **page_map;
  48        struct page **phys_page_map;
  49        void *addr;
  50
  51        size = PAGE_ALIGN(size);
  52
  53#ifdef __alpha__
  54        offset -= dev->hose->mem_space->start;
  55#endif
  56
  57        list_for_each_entry(agpmem, &dev->agp->memory, head)
  58                if (agpmem->bound <= offset
  59                    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
  60                    (offset + size))
  61                        break;
  62        if (&agpmem->head == &dev->agp->memory)
  63                return NULL;
  64
  65        /*
  66         * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
  67         * the CPU do not get remapped by the GART.  We fix this by using the kernel's
  68         * page-table instead (that's probably faster anyhow...).
  69         */
  70        /* note: use vmalloc() because num_pages could be large... */
  71        page_map = vmalloc(num_pages * sizeof(struct page *));
  72        if (!page_map)
  73                return NULL;
  74
  75        phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
  76        for (i = 0; i < num_pages; ++i)
  77                page_map[i] = phys_page_map[i];
  78        addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
  79        vfree(page_map);
  80
  81        return addr;
  82}
  83
  84/** Wrapper around agp_free_memory() */
  85void drm_free_agp(DRM_AGP_MEM * handle, int pages)
  86{
  87        agp_free_memory(handle);
  88}
  89EXPORT_SYMBOL(drm_free_agp);
  90
  91/** Wrapper around agp_bind_memory() */
  92int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
  93{
  94        return agp_bind_memory(handle, start);
  95}
  96
  97/** Wrapper around agp_unbind_memory() */
  98int drm_unbind_agp(DRM_AGP_MEM * handle)
  99{
 100        return agp_unbind_memory(handle);
 101}
 102EXPORT_SYMBOL(drm_unbind_agp);
 103
 104#else  /*  __OS_HAS_AGP  */
 105static inline void *agp_remap(unsigned long offset, unsigned long size,
 106                              struct drm_device * dev)
 107{
 108        return NULL;
 109}
 110
 111#endif                          /* agp */
 112
 113void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
 114{
 115        if (drm_core_has_AGP(dev) &&
 116            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 117                map->handle = agp_remap(map->offset, map->size, dev);
 118        else
 119                map->handle = ioremap(map->offset, map->size);
 120}
 121EXPORT_SYMBOL(drm_core_ioremap);
 122
 123void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
 124{
 125        if (drm_core_has_AGP(dev) &&
 126            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 127                map->handle = agp_remap(map->offset, map->size, dev);
 128        else
 129                map->handle = ioremap_wc(map->offset, map->size);
 130}
 131EXPORT_SYMBOL(drm_core_ioremap_wc);
 132
 133void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
 134{
 135        if (!map->handle || !map->size)
 136                return;
 137
 138        if (drm_core_has_AGP(dev) &&
 139            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 140                vunmap(map->handle);
 141        else
 142                iounmap(map->handle);
 143}
 144EXPORT_SYMBOL(drm_core_ioremapfree);
 145