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_noncached_wc(PAGE_KERNEL)
48 # else
49 # define PAGE_AGP PAGE_KERNEL
50 # endif
51 #endif
52
agp_remap(unsigned long offset,unsigned long size,struct drm_device * dev)53 static 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(array_size(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() */
drm_free_agp(struct agp_memory * handle,int pages)97 void drm_free_agp(struct agp_memory * handle, int pages)
98 {
99 agp_free_memory(handle);
100 }
101
102 /** Wrapper around agp_bind_memory() */
drm_bind_agp(struct agp_memory * handle,unsigned int start)103 int 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() */
drm_unbind_agp(struct agp_memory * handle)109 int drm_unbind_agp(struct agp_memory * handle)
110 {
111 return agp_unbind_memory(handle);
112 }
113
114 #else /* CONFIG_AGP */
agp_remap(unsigned long offset,unsigned long size,struct drm_device * dev)115 static 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
drm_legacy_ioremap(struct drm_local_map * map,struct drm_device * dev)123 void 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 }
130 EXPORT_SYMBOL(drm_legacy_ioremap);
131
drm_legacy_ioremap_wc(struct drm_local_map * map,struct drm_device * dev)132 void 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 }
139 EXPORT_SYMBOL(drm_legacy_ioremap_wc);
140
drm_legacy_ioremapfree(struct drm_local_map * map,struct drm_device * dev)141 void 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 }
151 EXPORT_SYMBOL(drm_legacy_ioremapfree);
152
drm_get_max_iomem(void)153 u64 drm_get_max_iomem(void)
154 {
155 struct resource *tmp;
156 resource_size_t max_iomem = 0;
157
158 for (tmp = iomem_resource.child; tmp; tmp = tmp->sibling) {
159 max_iomem = max(max_iomem, tmp->end);
160 }
161
162 return max_iomem;
163 }
164 EXPORT_SYMBOL(drm_get_max_iomem);
165
