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#include "drm_legacy.h"
  40
  41#if IS_ENABLED(CONFIG_AGP)
  42
  43#ifdef HAVE_PAGE_AGP
  44# include <asm/agp.h>
  45#else
  46# ifdef __powerpc__
  47#  define PAGE_AGP      __pgprot(_PAGE_KERNEL | _PAGE_NO_CACHE)
  48# else
  49#  define PAGE_AGP      PAGE_KERNEL
  50# endif
  51#endif
  52
  53static void *agp_remap(unsigned long offset, unsigned long size,
  54                       struct drm_device * dev)
  55{
  56        unsigned long i, num_pages =
  57            PAGE_ALIGN(size) / PAGE_SIZE;
  58        struct drm_agp_mem *agpmem;
  59        struct page **page_map;
  60        struct page **phys_page_map;
  61        void *addr;
  62
  63        size = PAGE_ALIGN(size);
  64
  65#ifdef __alpha__
  66        offset -= dev->hose->mem_space->start;
  67#endif
  68
  69        list_for_each_entry(agpmem, &dev->agp->memory, head)
  70                if (agpmem->bound <= offset
  71                    && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
  72                    (offset + size))
  73                        break;
  74        if (&agpmem->head == &dev->agp->memory)
  75                return NULL;
  76
  77        /*
  78         * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
  79         * the CPU do not get remapped by the GART.  We fix this by using the kernel's
  80         * page-table instead (that's probably faster anyhow...).
  81         */
  82        /* note: use vmalloc() because num_pages could be large... */
  83        page_map = vmalloc(num_pages * sizeof(struct page *));
  84        if (!page_map)
  85                return NULL;
  86
  87        phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
  88        for (i = 0; i < num_pages; ++i)
  89                page_map[i] = phys_page_map[i];
  90        addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
  91        vfree(page_map);
  92
  93        return addr;
  94}
  95
  96/** Wrapper around agp_free_memory() */
  97void drm_free_agp(struct agp_memory * handle, int pages)
  98{
  99        agp_free_memory(handle);
 100}
 101
 102/** Wrapper around agp_bind_memory() */
 103int drm_bind_agp(struct agp_memory * handle, unsigned int start)
 104{
 105        return agp_bind_memory(handle, start);
 106}
 107
 108/** Wrapper around agp_unbind_memory() */
 109int drm_unbind_agp(struct agp_memory * handle)
 110{
 111        return agp_unbind_memory(handle);
 112}
 113
 114#else /*  CONFIG_AGP  */
 115static inline void *agp_remap(unsigned long offset, unsigned long size,
 116                              struct drm_device * dev)
 117{
 118        return NULL;
 119}
 120
 121#endif /* CONFIG_AGP */
 122
 123void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
 124{
 125        if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 126                map->handle = agp_remap(map->offset, map->size, dev);
 127        else
 128                map->handle = ioremap(map->offset, map->size);
 129}
 130EXPORT_SYMBOL(drm_legacy_ioremap);
 131
 132void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
 133{
 134        if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 135                map->handle = agp_remap(map->offset, map->size, dev);
 136        else
 137                map->handle = ioremap_wc(map->offset, map->size);
 138}
 139EXPORT_SYMBOL(drm_legacy_ioremap_wc);
 140
 141void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
 142{
 143        if (!map->handle || !map->size)
 144                return;
 145
 146        if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
 147                vunmap(map->handle);
 148        else
 149                iounmap(map->handle);
 150}
 151EXPORT_SYMBOL(drm_legacy_ioremapfree);
 152