blob: fc0ebd273ef827d140993fda0ac8e2650c19632e [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>
David Herrmanncc5ea592014-08-29 12:12:32 +020039#include "drm_legacy.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Daniel Vettera7fb8a22015-09-09 16:45:52 +020041#if IS_ENABLED(CONFIG_AGP)
David Herrmannd6db6562014-08-29 12:12:35 +020042
43#ifdef HAVE_PAGE_AGP
44# include <asm/agp.h>
45#else
46# ifdef __powerpc__
Benjamin Herrenschmidt37035e72016-06-27 19:00:23 +100047# define PAGE_AGP pgprot_noncached_wc(PAGE_KERNEL)
David Herrmannd6db6562014-08-29 12:12:35 +020048# else
49# define PAGE_AGP PAGE_KERNEL
50# endif
51#endif
52
Adrian Bunk031de962006-04-10 23:18:27 -070053static void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +100054 struct drm_device * dev)
Dave Airlie31f64bd2006-04-07 16:55:43 +100055{
Dave Airlie07613ba2009-06-12 14:11:41 +100056 unsigned long i, num_pages =
Dave Airlie31f64bd2006-04-07 16:55:43 +100057 PAGE_ALIGN(size) / PAGE_SIZE;
58 struct drm_agp_mem *agpmem;
59 struct page **page_map;
Dave Airlie07613ba2009-06-12 14:11:41 +100060 struct page **phys_page_map;
Dave Airlie31f64bd2006-04-07 16:55:43 +100061 void *addr;
62
63 size = PAGE_ALIGN(size);
64
65#ifdef __alpha__
66 offset -= dev->hose->mem_space->start;
67#endif
68
Dave Airliebd1b3312007-05-26 05:01:51 +100069 list_for_each_entry(agpmem, &dev->agp->memory, head)
Dave Airlie31f64bd2006-04-07 16:55:43 +100070 if (agpmem->bound <= offset
71 && (agpmem->bound + (agpmem->pages << PAGE_SHIFT)) >=
72 (offset + size))
73 break;
Dan Carpenter404b0172010-04-27 14:11:05 -070074 if (&agpmem->head == &dev->agp->memory)
Dave Airlie31f64bd2006-04-07 16:55:43 +100075 return NULL;
76
77 /*
78 * OK, we're mapping AGP space on a chipset/platform on which memory accesses by
79 * the CPU do not get remapped by the GART. We fix this by using the kernel's
80 * page-table instead (that's probably faster anyhow...).
81 */
82 /* note: use vmalloc() because num_pages could be large... */
83 page_map = vmalloc(num_pages * sizeof(struct page *));
84 if (!page_map)
85 return NULL;
86
Dave Airlie07613ba2009-06-12 14:11:41 +100087 phys_page_map = (agpmem->memory->pages + (offset - agpmem->bound) / PAGE_SIZE);
Dave Airlie31f64bd2006-04-07 16:55:43 +100088 for (i = 0; i < num_pages; ++i)
Dave Airlie07613ba2009-06-12 14:11:41 +100089 page_map[i] = phys_page_map[i];
Dave Airlie31f64bd2006-04-07 16:55:43 +100090 addr = vmap(page_map, num_pages, VM_IOREMAP, PAGE_AGP);
91 vfree(page_map);
92
93 return addr;
94}
95
Linus Torvalds1da177e2005-04-16 15:20:36 -070096/** Wrapper around agp_free_memory() */
Daniel Vetterd2e546b2013-12-11 11:34:40 +010097void drm_free_agp(struct agp_memory * handle, int pages)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Daniel Vetter89c37262010-08-23 22:53:36 +020099 agp_free_memory(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100}
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102/** Wrapper around agp_bind_memory() */
Daniel Vetterd2e546b2013-12-11 11:34:40 +0100103int drm_bind_agp(struct agp_memory * handle, unsigned int start)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
Daniel Vetter89c37262010-08-23 22:53:36 +0200105 return agp_bind_memory(handle, start);
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_unbind_memory() */
Daniel Vetterd2e546b2013-12-11 11:34:40 +0100109int drm_unbind_agp(struct agp_memory * handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110{
Daniel Vetter89c37262010-08-23 22:53:36 +0200111 return agp_unbind_memory(handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
Adrian Bunk031de962006-04-10 23:18:27 -0700113
Daniel Vettera7fb8a22015-09-09 16:45:52 +0200114#else /* CONFIG_AGP */
Adrian Bunk031de962006-04-10 23:18:27 -0700115static inline void *agp_remap(unsigned long offset, unsigned long size,
Dave Airlie84b1fd12007-07-11 15:53:27 +1000116 struct drm_device * dev)
Adrian Bunk031de962006-04-10 23:18:27 -0700117{
118 return NULL;
119}
120
Daniel Vettera7fb8a22015-09-09 16:45:52 +0200121#endif /* CONFIG_AGP */
Dave Airlie31f64bd2006-04-07 16:55:43 +1000122
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200123void drm_legacy_ioremap(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100124{
Daniel Vetterd9906752013-12-11 11:34:35 +0100125 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100126 map->handle = agp_remap(map->offset, map->size, dev);
127 else
128 map->handle = ioremap(map->offset, map->size);
129}
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200130EXPORT_SYMBOL(drm_legacy_ioremap);
Christoph Hellwig004a7722007-01-08 21:56:59 +1100131
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200132void drm_legacy_ioremap_wc(struct drm_local_map *map, struct drm_device *dev)
Dave Airlie242e3df2008-07-15 15:48:05 +1000133{
Daniel Vetterd9906752013-12-11 11:34:35 +0100134 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000135 map->handle = agp_remap(map->offset, map->size, dev);
136 else
137 map->handle = ioremap_wc(map->offset, map->size);
Dave Airlie242e3df2008-07-15 15:48:05 +1000138}
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200139EXPORT_SYMBOL(drm_legacy_ioremap_wc);
Dave Airlie9b8d5a12009-02-07 11:15:41 +1000140
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200141void drm_legacy_ioremapfree(struct drm_local_map *map, struct drm_device *dev)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100142{
143 if (!map->handle || !map->size)
144 return;
145
Daniel Vetterd9906752013-12-11 11:34:35 +0100146 if (dev->agp && dev->agp->cant_use_aperture && map->type == _DRM_AGP)
Christoph Hellwig004a7722007-01-08 21:56:59 +1100147 vunmap(map->handle);
148 else
149 iounmap(map->handle);
150}
Daniel Vetter86c1fbd2014-09-10 12:43:56 +0200151EXPORT_SYMBOL(drm_legacy_ioremapfree);