blob: d15e09b0ae0bf8c322712d5e3101f7dc8d53eb6a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/**
Dave Airlieb5e89ed2005-09-25 14:28:13 +10002 * \file drm_scatter.c
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * IOCTLs to manage scatter/gather memory
4 *
5 * \author Gareth Hughes <gareth@valinux.com>
6 */
7
8/*
9 * Created: Mon Dec 18 23:20:54 2000 by gareth@valinux.com
10 *
11 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
12 * All Rights Reserved.
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining a
15 * copy of this software and associated documentation files (the "Software"),
16 * to deal in the Software without restriction, including without limitation
17 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
18 * and/or sell copies of the Software, and to permit persons to whom the
19 * Software is furnished to do so, subject to the following conditions:
20 *
21 * The above copyright notice and this permission notice (including the next
22 * paragraph) shall be included in all copies or substantial portions of the
23 * Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
28 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
29 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
30 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
31 * DEALINGS IN THE SOFTWARE.
32 */
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/vmalloc.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "drmP.h"
37
38#define DEBUG_SCATTER 0
39
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -070040static inline void *drm_vmalloc_dma(unsigned long size)
41{
42#if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE)
43 return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE);
44#else
45 return vmalloc_32(size);
46#endif
47}
48
Dave Airlie55910512007-07-11 16:53:40 +100049void drm_sg_cleanup(struct drm_sg_mem * entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070050{
51 struct page *page;
52 int i;
53
Dave Airlieb5e89ed2005-09-25 14:28:13 +100054 for (i = 0; i < entry->pages; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 page = entry->pagelist[i];
Dave Airlieb5e89ed2005-09-25 14:28:13 +100056 if (page)
57 ClearPageReserved(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 }
59
Dave Airlieb5e89ed2005-09-25 14:28:13 +100060 vfree(entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Eric Anholt9a298b22009-03-24 12:23:04 -070062 kfree(entry->busaddr);
63 kfree(entry->pagelist);
64 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065}
66
Dave Airlied1f2b552005-08-05 22:11:22 +100067#ifdef _LP64
68# define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1)))
69#else
70# define ScatterHandle(x) (unsigned int)(x)
71#endif
72
Eric Anholtc153f452007-09-03 12:06:45 +100073int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
Dave Airlie55910512007-07-11 16:53:40 +100075 struct drm_sg_mem *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 unsigned long pages, i, j;
77
Márton Németh3e684ea2008-01-24 15:58:57 +100078 DRM_DEBUG("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
80 if (!drm_core_check_feature(dev, DRIVER_SG))
81 return -EINVAL;
82
Dave Airlieb5e89ed2005-09-25 14:28:13 +100083 if (dev->sg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 return -EINVAL;
85
Eric Anholt9a298b22009-03-24 12:23:04 -070086 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100087 if (!entry)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 return -ENOMEM;
89
Dave Airlieb5e89ed2005-09-25 14:28:13 +100090 memset(entry, 0, sizeof(*entry));
Eric Anholtc153f452007-09-03 12:06:45 +100091 pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE;
Márton Németh3e684ea2008-01-24 15:58:57 +100092 DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 entry->pages = pages;
Eric Anholt9a298b22009-03-24 12:23:04 -070095 entry->pagelist = kmalloc(pages * sizeof(*entry->pagelist), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +100096 if (!entry->pagelist) {
Eric Anholt9a298b22009-03-24 12:23:04 -070097 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 return -ENOMEM;
99 }
100
101 memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist));
102
Eric Anholt9a298b22009-03-24 12:23:04 -0700103 entry->busaddr = kmalloc(pages * sizeof(*entry->busaddr), GFP_KERNEL);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000104 if (!entry->busaddr) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700105 kfree(entry->pagelist);
106 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 return -ENOMEM;
108 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000109 memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
Benjamin Herrenschmidt6876b3b2008-03-28 14:23:07 -0700111 entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT);
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000112 if (!entry->virtual) {
Eric Anholt9a298b22009-03-24 12:23:04 -0700113 kfree(entry->busaddr);
114 kfree(entry->pagelist);
115 kfree(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 return -ENOMEM;
117 }
118
119 /* This also forces the mapping of COW pages, so our page list
120 * will be valid. Please don't remove it...
121 */
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000122 memset(entry->virtual, 0, pages << PAGE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Dave Airlied1f2b552005-08-05 22:11:22 +1000124 entry->handle = ScatterHandle((unsigned long)entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Márton Németh3e684ea2008-01-24 15:58:57 +1000126 DRM_DEBUG("handle = %08lx\n", entry->handle);
127 DRM_DEBUG("virtual = %p\n", entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000129 for (i = (unsigned long)entry->virtual, j = 0; j < pages;
130 i += PAGE_SIZE, j++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 entry->pagelist[j] = vmalloc_to_page((void *)i);
132 if (!entry->pagelist[j])
133 goto failed;
134 SetPageReserved(entry->pagelist[j]);
135 }
136
Eric Anholtc153f452007-09-03 12:06:45 +1000137 request->handle = entry->handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 dev->sg = entry;
140
141#if DEBUG_SCATTER
142 /* Verify that each page points to its virtual address, and vice
143 * versa.
144 */
145 {
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000146 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000148 for (i = 0; i < pages; i++) {
149 unsigned long *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000151 tmp = page_address(entry->pagelist[i]);
152 for (j = 0;
153 j < PAGE_SIZE / sizeof(unsigned long);
154 j++, tmp++) {
155 *tmp = 0xcafebabe;
156 }
157 tmp = (unsigned long *)((u8 *) entry->virtual +
158 (PAGE_SIZE * i));
159 for (j = 0;
160 j < PAGE_SIZE / sizeof(unsigned long);
161 j++, tmp++) {
162 if (*tmp != 0xcafebabe && error == 0) {
163 error = 1;
164 DRM_ERROR("Scatter allocation error, "
165 "pagelist does not match "
166 "virtual mapping\n");
167 }
168 }
169 tmp = page_address(entry->pagelist[i]);
170 for (j = 0;
171 j < PAGE_SIZE / sizeof(unsigned long);
172 j++, tmp++) {
173 *tmp = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
175 }
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000176 if (error == 0)
177 DRM_ERROR("Scatter allocation matches pagelist\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179#endif
180
181 return 0;
182
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000183 failed:
184 drm_sg_cleanup(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return -ENOMEM;
186}
Eric Anholtc153f452007-09-03 12:06:45 +1000187
188int drm_sg_alloc_ioctl(struct drm_device *dev, void *data,
189 struct drm_file *file_priv)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Eric Anholtc153f452007-09-03 12:06:45 +1000191 struct drm_scatter_gather *request = data;
192
193 return drm_sg_alloc(dev, request);
194
195}
196
197int drm_sg_free(struct drm_device *dev, void *data,
198 struct drm_file *file_priv)
199{
200 struct drm_scatter_gather *request = data;
Dave Airlie55910512007-07-11 16:53:40 +1000201 struct drm_sg_mem *entry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 if (!drm_core_check_feature(dev, DRIVER_SG))
204 return -EINVAL;
205
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 entry = dev->sg;
207 dev->sg = NULL;
208
Eric Anholtc153f452007-09-03 12:06:45 +1000209 if (!entry || entry->handle != request->handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return -EINVAL;
211
Márton Németh3e684ea2008-01-24 15:58:57 +1000212 DRM_DEBUG("virtual = %p\n", entry->virtual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Dave Airlieb5e89ed2005-09-25 14:28:13 +1000214 drm_sg_cleanup(entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 return 0;
217}