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