Root/drivers/gpu/drm/drm_memory.c

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 "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

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