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
agp_remap(unsigned long offset,unsigned long size,struct drm_device * dev)41 static 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() */
drm_free_agp(DRM_AGP_MEM * handle,int pages)85 void drm_free_agp(DRM_AGP_MEM * handle, int pages)
86 {
87 agp_free_memory(handle);
88 }
89 EXPORT_SYMBOL(drm_free_agp);
90
91 /** Wrapper around agp_bind_memory() */
drm_bind_agp(DRM_AGP_MEM * handle,unsigned int start)92 int 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() */
drm_unbind_agp(DRM_AGP_MEM * handle)98 int drm_unbind_agp(DRM_AGP_MEM * handle)
99 {
100 return agp_unbind_memory(handle);
101 }
102 EXPORT_SYMBOL(drm_unbind_agp);
103
104 #else /* __OS_HAS_AGP */
agp_remap(unsigned long offset,unsigned long size,struct drm_device * dev)105 static 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
drm_core_ioremap(struct drm_local_map * map,struct drm_device * dev)113 void 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 }
121 EXPORT_SYMBOL(drm_core_ioremap);
122
drm_core_ioremap_wc(struct drm_local_map * map,struct drm_device * dev)123 void 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 }
131 EXPORT_SYMBOL(drm_core_ioremap_wc);
132
drm_core_ioremapfree(struct drm_local_map * map,struct drm_device * dev)133 void 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 }
144 EXPORT_SYMBOL(drm_core_ioremapfree);
145