blob: 126d50ea181f110abaf22e059425e55e0ef99c16 [file] [log] [blame]
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>
Paul Gortmaker2d1a8a42011-08-30 18:16:33 -040037#include <linux/export.h>
David Howells760285e2012-10-02 18:01:07 +010038#include <drm/drmP.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#if __OS_HAS_AGP
Adrian Bunk031de962006-04-10 23:18:27 -070041static void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +100042 struct drm_device * dev)
Dave Airlie31f64bd2006-04-07 16:55:43 +100043{
Dave Airlie07613ba2009-06-12 14:11:41 +100044 unsigned long i, num_pages =
Dave Airlie31f64bd2006-04-07 16:55:43 +100045 PAGE_ALIGN(size) / PAGE_SIZE;
46 struct drm_agp_mem *agpmem;
47 struct page **page_map;
Dave Airlie07613ba2009-06-12 14:11:41 +100048 struct page **phys_page_map;
Dave Airlie31f64bd2006-04-07 16:55:43 +100049 void *addr;
50
51 size = PAGE_ALIGN(size);
52
53#ifdef __alpha__
54 offset -= dev->hose->mem_space->start;
55#endif
56
Dave Airliebd1b3312007-05-26 05:01:51 +100057 list_for_each_entry(agpmem, &dev->agp->memory, head)
Dave Airlie31f64bd2006-04-07 16:55:43 +100058 if (agpmem->bound <= offset
59 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
60 (offset + size))
61 break;
Dan Carpenter404b0172010-04-27 14:11:05 -070062 if (&agpmem->head == &dev->agp->memory)
Dave Airlie31f64bd2006-04-07 16:55:43 +100063 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
Dave Airlie07613ba2009-06-12 14:11:41 +100075 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
Dave Airlie31f64bd2006-04-07 16:55:43 +100076 for (i = 0; i < num_pages; ++i)
Dave Airlie07613ba2009-06-12 14:11:41 +100077 page_map[i] = phys_page_map[i];
Dave Airlie31f64bd2006-04-07 16:55:43 +100078 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
79 vfree(page_map);
80
81 return addr;
82}
83
Linus Torvalds1da177e2005-04-16 15:20:36 -070084/** Wrapper around agp_free_memory() */
Daniel Vetter690bb512010-08-23 22:53:35 +020085void drm_free_agp(DRM_AGP_MEM * handle, int pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Daniel Vetter89c37262010-08-23 22:53:36 +020087 agp_free_memory(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
Eric Anholt673a3942008-07-30 12:06:12 -070089EXPORT_SYMBOL(drm_free_agp);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091/** Wrapper around agp_bind_memory() */
Dave Airlieb5e89ed2005-09-25 14:28:13 +100092int drm_bind_agp(DRM_AGP_MEM * handle, unsigned int start)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
Daniel Vetter89c37262010-08-23 22:53:36 +020094 return agp_bind_memory(handle, start);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
Dave Airlieb5e89ed2005-09-25 14:28:13 +100096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/** Wrapper around agp_unbind_memory() */
Dave Airlieb5e89ed2005-09-25 14:28:13 +100098int drm_unbind_agp(DRM_AGP_MEM * handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
Daniel Vetter89c37262010-08-23 22:53:36 +0200100 return agp_unbind_memory(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
Eric Anholt673a3942008-07-30 12:06:12 -0700102EXPORT_SYMBOL(drm_unbind_agp);
Adrian Bunk031de962006-04-10 23:18:27 -0700103
104#else /* __OS_HAS_AGP */
Adrian Bunk031de962006-04-10 23:18:27 -0700105static inline void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +1000106 struct drm_device * dev)
Adrian Bunk031de962006-04-10 23:18:27 -0700107{
108 return NULL;
109}
110
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000111#endif /* agp */
Dave Airlie31f64bd2006-04-07 16:55:43 +1000112
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100113void drm_core_ioremap(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100114{
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}
121EXPORT_SYMBOL(drm_core_ioremap);
122
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100123void drm_core_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
Dave Airlie242e3df2008-07-15 15:48:05 +1000124{
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000125 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);
Dave Airlie242e3df2008-07-15 15:48:05 +1000130}
131EXPORT_SYMBOL(drm_core_ioremap_wc);
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000132
Benjamin Herrenschmidtf77d3902009-02-02 16:55:46 +1100133void drm_core_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100134{
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}
144EXPORT_SYMBOL(drm_core_ioremapfree);