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linux
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 "drmP.h"
38
39#ifdef DEBUG_MEMORY
40#include "drm_memory_debug.h"
41#else
42
43/** No-op. */
44void drm_mem_init(void)
45{
46}
47
48/**
49 * Called when "/proc/dri/%dev%/mem" is read.
50 *
51 * \param buf output buffer.
52 * \param start start of output data.
53 * \param offset requested start offset.
54 * \param len requested number of bytes.
55 * \param eof whether there is no more data to return.
56 * \param data private data.
57 * \return number of written bytes.
58 *
59 * No-op.
60 */
61int drm_mem_info(char *buf, char **start, off_t offset,
62 int len, int *eof, void *data)
63{
64 return 0;
65}
66
67/** Wrapper around kmalloc() and kfree() */
68void *drm_realloc(void *oldpt, size_t oldsize, size_t size, int area)
69{
70 void *pt;
71
72 if (!(pt = kmalloc(size, GFP_KERNEL)))
73 return NULL;
74 if (oldpt && oldsize) {
75 memcpy(pt, oldpt, oldsize);
76 kfree(oldpt);
77 }
78 return pt;
79}
80
81#if __OS_HAS_AGP
82static void *agp_remap(unsigned long offset, unsigned long size,
83 drm_device_t * dev)
84{
85 unsigned long *phys_addr_map, i, num_pages =
86 PAGE_ALIGN(size) / PAGE_SIZE;
87 struct drm_agp_mem *agpmem;
88 struct page **page_map;
89 void *addr;
90
91 size = PAGE_ALIGN(size);
92
93#ifdef __alpha__
94 offset -= dev->hose->mem_space->start;
95#endif
96
97 for (agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next)
98 if (agpmem->bound <= offset
99 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
100 (offset + size))
101 break;
102 if (!agpmem)
103 return NULL;
104
105 /*
106 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
107 * the CPU do not get remapped by the GART. We fix this by using the kernel's
108 * page-table instead (that's probably faster anyhow...).
109 */
110 /* note: use vmalloc() because num_pages could be large... */
111 page_map = vmalloc(num_pages * sizeof(struct page *));
112 if (!page_map)
113 return NULL;
114
115 phys_addr_map =
116 agpmem->memory->memory + (offset - agpmem->bound) / PAGE_SIZE;
117 for (i = 0; i < num_pages; ++i)
118 page_map[i] = pfn_to_page(phys_addr_map[i] >> PAGE_SHIFT);
119 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
120 vfree(page_map);
121
122 return addr;
123}
124
125/** Wrapper around agp_allocate_memory() */
126DRM_AGP_MEM *drm_alloc_agp(drm_device_t * dev, int pages, u32 type)
127{
128 return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
129}
130
131/** Wrapper around agp_free_memory() */
132int drm_free_agp(DRM_AGP_MEM * handle, int pages)
133{
134 return drm_agp_free_memory(handle) ? 0 : -EINVAL;
135}
136
137/** Wrapper around agp_bind_memory() */
138int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
139{
140 return drm_agp_bind_memory(handle, start);
141}
142
143/** Wrapper around agp_unbind_memory() */
144int drm_unbind_agp(DRM_AGP_MEM * handle)
145{
146 return drm_agp_unbind_memory(handle);
147}
148
149#else /* __OS_HAS_AGP */
150static inline void *agp_remap(unsigned long offset, unsigned long size,
151 drm_device_t * dev)
152{
153 return NULL;
154}
155
156#endif /* agp */
157
158#endif /* debug_memory */
159
160void drm_core_ioremap(struct drm_map *map, struct drm_device *dev)
161{
162 if (drm_core_has_AGP(dev) &&
163 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
164 map->handle = agp_remap(map->offset, map->size, dev);
165 else
166 map->handle = ioremap(map->offset, map->size);
167}
168EXPORT_SYMBOL(drm_core_ioremap);
169
170void drm_core_ioremapfree(struct drm_map *map, struct drm_device *dev)
171{
172 if (!map->handle || !map->size)
173 return;
174
175 if (drm_core_has_AGP(dev) &&
176 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
177 vunmap(map->handle);
178 else
179 iounmap(map->handle);
180}
181EXPORT_SYMBOL(drm_core_ioremapfree);
182