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 "drmP.h"
  38
  39/**
  40 * Called when "/proc/dri/%dev%/mem" is read.
  41 *
  42 * \param buf output buffer.
  43 * \param start start of output data.
  44 * \param offset requested start offset.
  45 * \param len requested number of bytes.
  46 * \param eof whether there is no more data to return.
  47 * \param data private data.
  48 * \return number of written bytes.
  49 *
  50 * No-op.
  51 */
  52int drm_mem_info(char *buf, char **start, off_t offset,
  53                 int len, int *eof, void *data)
  54{
  55        return 0;
  56}
  57
  58#if __OS_HAS_AGP
  59static void *agp_remap(unsigned long offset, unsigned long size,
  60                       struct drm_device * dev)
  61{
  62        unsigned long i, num_pages =
  63            PAGE_ALIGN(size) / PAGE_SIZE;
  64        struct drm_agp_mem *agpmem;
  65        struct page **page_map;
  66        struct page **phys_page_map;
  67        void *addr;
  68
  69        size = PAGE_ALIGN(size);
  70
  71#ifdef __alpha__
  72        offset -= dev->hose->mem_space->start;
  73#endif
  74
  75        list_for_each_entry(agpmem, &dev->agp->memory, head)
  76                if (agpmem->bound <= offset
  77                    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
  78                    (offset + size))
  79                        break;
  80        if (!agpmem)
  81                return NULL;
  82
  83        /*
  84         * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
  85         * the CPU do not get remapped by the GART.  We fix this by using the kernel's
  86         * page-table instead (that's probably faster anyhow...).
  87         */
  88        /* note: use vmalloc() because num_pages could be large... */
  89        page_map = vmalloc(num_pages * sizeof(struct page *));
  90        if (!page_map)
  91                return NULL;
  92
  93        phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
  94        for (i = 0; i < num_pages; ++i)
  95                page_map[i] = phys_page_map[i];
  96        addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
  97        vfree(page_map);
  98
  99        return addr;
 100}
 101
 102/** Wrapper around agp_allocate_memory() */
 103DRM_AGP_MEM *drm_alloc_agp(struct drm_device * dev, int pages, u32 type)
 104{
 105        return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
 106}
 107
 108/** Wrapper around agp_free_memory() */
 109int drm_free_agp(DRM_AGP_MEM * handle, int pages)
 110{
 111        return drm_agp_free_memory(handle) ? 0 : -EINVAL;
 112}
 113EXPORT_SYMBOL(drm_free_agp);
 114
 115/** Wrapper around agp_bind_memory() */
 116int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
 117{
 118        return drm_agp_bind_memory(handle, start);
 119}
 120
 121/** Wrapper around agp_unbind_memory() */
 122int drm_unbind_agp(DRM_AGP_MEM * handle)
 123{
 124        return drm_agp_unbind_memory(handle);
 125}
 126EXPORT_SYMBOL(drm_unbind_agp);
 127
 128#else  /*  __OS_HAS_AGP  */
 129static inline void *agp_remap(unsigned long offset, unsigned long size,
 130                              struct drm_device * dev)
 131{
 132        return NULL;
 133}
 134
 135#endif                          /* agp */
 136
 137void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
 138{
 139        if (drm_core_has_AGP(dev) &&
 140            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 141                map->handle = agp_remap(map->offset, map->size, dev);
 142        else
 143                map->handle = ioremap(map->offset, map->size);
 144}
 145EXPORT_SYMBOL(drm_core_ioremap);
 146
 147void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
 148{
 149        if (drm_core_has_AGP(dev) &&
 150            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 151                map->handle = agp_remap(map->offset, map->size, dev);
 152        else
 153                map->handle = ioremap_wc(map->offset, map->size);
 154}
 155EXPORT_SYMBOL(drm_core_ioremap_wc);
 156
 157void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
 158{
 159        if (!map->handle || !map->size)
 160                return;
 161
 162        if (drm_core_has_AGP(dev) &&
 163            dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 164                vunmap(map->handle);
 165        else
 166                iounmap(map->handle);
 167}
 168EXPORT_SYMBOL(drm_core_ioremapfree);
 169