3 * Memory management wrappers for DRM
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Thu Feb 4 14:00:34 1999 by faith@valinux.com
12 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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:
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
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.
36 #include <linux/highmem.h>
40 * Called when "/proc/dri/%dev%/mem" is read.
42 * \param buf output buffer.
43 * \param start start of output data.
44 * \param offset requested start offset.
45 * \param len requested number of bytes.
46 * \param eof whether there is no more data to return.
47 * \param data private data.
48 * \return number of written bytes.
52 int drm_mem_info(char *buf
, char **start
, off_t offset
,
53 int len
, int *eof
, void *data
)
59 static void *agp_remap(unsigned long offset
, unsigned long size
,
60 struct drm_device
* dev
)
62 unsigned long i
, num_pages
=
63 PAGE_ALIGN(size
) / PAGE_SIZE
;
64 struct drm_agp_mem
*agpmem
;
65 struct page
**page_map
;
66 struct page
**phys_page_map
;
69 size
= PAGE_ALIGN(size
);
72 offset
-= dev
->hose
->mem_space
->start
;
75 list_for_each_entry(agpmem
, &dev
->agp
->memory
, head
)
76 if (agpmem
->bound
<= offset
77 && (agpmem
->bound
+ (agpmem
->pages
<< PAGE_SHIFT
)) >=
80 if (&agpmem
->head
== &dev
->agp
->memory
)
84 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
85 * the CPU do not get remapped by the GART. We fix this by using the kernel's
86 * page-table instead (that's probably faster anyhow...).
88 /* note: use vmalloc() because num_pages could be large... */
89 page_map
= vmalloc(num_pages
* sizeof(struct page
*));
93 phys_page_map
= (agpmem
->memory
->pages
+ (offset
- agpmem
->bound
) / PAGE_SIZE
);
94 for (i
= 0; i
< num_pages
; ++i
)
95 page_map
[i
] = phys_page_map
[i
];
96 addr
= vmap(page_map
, num_pages
, VM_IOREMAP
, PAGE_AGP
);
102 /** Wrapper around agp_free_memory() */
103 void drm_free_agp(DRM_AGP_MEM
* handle
, int pages
)
105 agp_free_memory(handle
);
107 EXPORT_SYMBOL(drm_free_agp
);
109 /** Wrapper around agp_bind_memory() */
110 int drm_bind_agp(DRM_AGP_MEM
* handle
, unsigned int start
)
112 return agp_bind_memory(handle
, start
);
115 /** Wrapper around agp_unbind_memory() */
116 int drm_unbind_agp(DRM_AGP_MEM
* handle
)
118 return agp_unbind_memory(handle
);
120 EXPORT_SYMBOL(drm_unbind_agp
);
122 #else /* __OS_HAS_AGP */
123 static inline void *agp_remap(unsigned long offset
, unsigned long size
,
124 struct drm_device
* dev
)
131 void drm_core_ioremap(struct drm_local_map
*map
, struct drm_device
*dev
)
133 if (drm_core_has_AGP(dev
) &&
134 dev
->agp
&& dev
->agp
->cant_use_aperture
&& map
->type
== _DRM_AGP
)
135 map
->handle
= agp_remap(map
->offset
, map
->size
, dev
);
137 map
->handle
= ioremap(map
->offset
, map
->size
);
139 EXPORT_SYMBOL(drm_core_ioremap
);
141 void drm_core_ioremap_wc(struct drm_local_map
*map
, struct drm_device
*dev
)
143 if (drm_core_has_AGP(dev
) &&
144 dev
->agp
&& dev
->agp
->cant_use_aperture
&& map
->type
== _DRM_AGP
)
145 map
->handle
= agp_remap(map
->offset
, map
->size
, dev
);
147 map
->handle
= ioremap_wc(map
->offset
, map
->size
);
149 EXPORT_SYMBOL(drm_core_ioremap_wc
);
151 void drm_core_ioremapfree(struct drm_local_map
*map
, struct drm_device
*dev
)
153 if (!map
->handle
|| !map
->size
)
156 if (drm_core_has_AGP(dev
) &&
157 dev
->agp
&& dev
->agp
->cant_use_aperture
&& map
->type
== _DRM_AGP
)
160 iounmap(map
->handle
);
162 EXPORT_SYMBOL(drm_core_ioremapfree
);
This page took 0.03342 seconds and 5 git commands to generate.