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Dave Airlieb5e89ed2005-09-25 14:28:13 +10001/**
2 * \file drm_memory.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * Memory management wrappers for DRM
4 *
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
7 */
8
Dave Airlieb5e89ed2005-09-25 14:28:13 +10009/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/highmem.h>
37#include "drmP.h"
38
Linus Torvalds1da177e2005-04-16 15:20:36 -070039/**
40 * Called when "/proc/dri/%dev%/mem" is read.
Dave Airlieb5e89ed2005-09-25 14:28:13 +100041 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * \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.
49 *
Dave Airlieb5e89ed2005-09-25 14:28:13 +100050 * No-op.
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 */
52int drm_mem_info(char *buf, char **start, off_t offset,
Dave Airlieb5e89ed2005-09-25 14:28:13 +100053 int len, int *eof, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 return 0;
56}
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058#if __OS_HAS_AGP
Adrian Bunk031de962006-04-10 23:18:27 -070059static void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +100060 struct drm_device * dev)
Dave Airlie31f64bd2006-04-07 16:55:43 +100061{
Dave Airlie07613ba2009-06-12 14:11:41 +100062 unsigned long i, num_pages =
Dave Airlie31f64bd2006-04-07 16:55:43 +100063 PAGE_ALIGN(size) / PAGE_SIZE;
64 struct drm_agp_mem *agpmem;
65 struct page **page_map;
Dave Airlie07613ba2009-06-12 14:11:41 +100066 struct page **phys_page_map;
Dave Airlie31f64bd2006-04-07 16:55:43 +100067 void *addr;
68
69 size = PAGE_ALIGN(size);
70
71#ifdef __alpha__
72 offset -= dev->hose->mem_space->start;
73#endif
74
Dave Airliebd1b3312007-05-26 05:01:51 +100075 list_for_each_entry(agpmem, &dev->agp->memory, head)
Dave Airlie31f64bd2006-04-07 16:55:43 +100076 if (agpmem->bound <= offset
77 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
78 (offset + size))
79 break;
80 if (!agpmem)
81 return NULL;
82
83 /*
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...).
87 */
88 /* note: use vmalloc() because num_pages could be large... */
89 page_map = vmalloc(num_pages * sizeof(struct page *));
90 if (!page_map)
91 return NULL;
92
Dave Airlie07613ba2009-06-12 14:11:41 +100093 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
Dave Airlie31f64bd2006-04-07 16:55:43 +100094 for (i = 0; i < num_pages; ++i)
Dave Airlie07613ba2009-06-12 14:11:41 +100095 page_map[i] = phys_page_map[i];
Dave Airlie31f64bd2006-04-07 16:55:43 +100096 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
97 vfree(page_map);
98
99 return addr;
100}
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102/** Wrapper around agp_allocate_memory() */
Dave Airlie84b1fd12007-07-11 15:53:27 +1000103DRM_AGP_MEM *drm_alloc_agp(struct drm_device * dev, int pages, u32 type)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Dave Airlieb5d499c2005-07-10 18:17:42 +1000105 return drm_agp_allocate_memory(dev->agp->bridge, pages, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108/** Wrapper around agp_free_memory() */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000109int drm_free_agp(DRM_AGP_MEM * handle, int pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
111 return drm_agp_free_memory(handle) ? 0 : -EINVAL;
112}
Eric Anholt673a3942008-07-30 12:06:12 -0700113EXPORT_SYMBOL(drm_free_agp);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000114
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115/** Wrapper around agp_bind_memory() */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000116int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
118 return drm_agp_bind_memory(handle, start);
119}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000120
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121/** Wrapper around agp_unbind_memory() */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000122int drm_unbind_agp(DRM_AGP_MEM * handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123{
124 return drm_agp_unbind_memory(handle);
125}
Eric Anholt673a3942008-07-30 12:06:12 -0700126EXPORT_SYMBOL(drm_unbind_agp);
Adrian Bunk031de962006-04-10 23:18:27 -0700127
128#else /* __OS_HAS_AGP */
Adrian Bunk031de962006-04-10 23:18:27 -0700129static inline void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +1000130 struct drm_device * dev)
Adrian Bunk031de962006-04-10 23:18:27 -0700131{
132 return NULL;
133}
134
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000135#endif /* agp */
Dave Airlie31f64bd2006-04-07 16:55:43 +1000136
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100137void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100138{
139 if (drm_core_has_AGP(dev) &&
140 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
141 map->handle = agp_remap(map->offset, map->size, dev);
142 else
143 map->handle = ioremap(map->offset, map->size);
144}
145EXPORT_SYMBOL(drm_core_ioremap);
146
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100147void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
Dave Airlie242e3df2008-07-15 15:48:05 +1000148{
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000149 if (drm_core_has_AGP(dev) &&
150 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
151 map->handle = agp_remap(map->offset, map->size, dev);
152 else
153 map->handle = ioremap_wc(map->offset, map->size);
Dave Airlie242e3df2008-07-15 15:48:05 +1000154}
155EXPORT_SYMBOL(drm_core_ioremap_wc);
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000156
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100157void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100158{
159 if (!map->handle || !map->size)
160 return;
161
162 if (drm_core_has_AGP(dev) &&
163 dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
164 vunmap(map->handle);
165 else
166 iounmap(map->handle);
167}
168EXPORT_SYMBOL(drm_core_ioremapfree);