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Commit | Line | Data |
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1da177e4 | 1 | /** |
b5e89ed5 | 2 | * \file drm_scatter.c |
1da177e4 LT |
3 | * 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 | ||
1da177e4 | 34 | #include <linux/vmalloc.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
1da177e4 LT |
36 | #include "drmP.h" |
37 | ||
38 | #define DEBUG_SCATTER 0 | |
39 | ||
6876b3ba BH |
40 | static 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 | ||
55910517 | 49 | void drm_sg_cleanup(struct drm_sg_mem * entry) |
1da177e4 LT |
50 | { |
51 | struct page *page; | |
52 | int i; | |
53 | ||
b5e89ed5 | 54 | for (i = 0; i < entry->pages; i++) { |
1da177e4 | 55 | page = entry->pagelist[i]; |
b5e89ed5 DA |
56 | if (page) |
57 | ClearPageReserved(page); | |
1da177e4 LT |
58 | } |
59 | ||
b5e89ed5 DA |
60 | vfree(entry->virtual); |
61 | ||
9a298b2a EA |
62 | kfree(entry->busaddr); |
63 | kfree(entry->pagelist); | |
64 | kfree(entry); | |
1da177e4 LT |
65 | } |
66 | ||
d1f2b55a DA |
67 | #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 | ||
c153f45f | 73 | int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) |
1da177e4 | 74 | { |
55910517 | 75 | struct drm_sg_mem *entry; |
1da177e4 LT |
76 | unsigned long pages, i, j; |
77 | ||
3e684eae | 78 | DRM_DEBUG("\n"); |
1da177e4 LT |
79 | |
80 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
81 | return -EINVAL; | |
82 | ||
b5e89ed5 | 83 | if (dev->sg) |
1da177e4 LT |
84 | return -EINVAL; |
85 | ||
9a298b2a | 86 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
b5e89ed5 | 87 | if (!entry) |
1da177e4 LT |
88 | return -ENOMEM; |
89 | ||
b5e89ed5 | 90 | memset(entry, 0, sizeof(*entry)); |
c153f45f | 91 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
3e684eae | 92 | DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages); |
1da177e4 LT |
93 | |
94 | entry->pages = pages; | |
9a298b2a | 95 | entry->pagelist = kmalloc(pages * sizeof(*entry->pagelist), GFP_KERNEL); |
b5e89ed5 | 96 | if (!entry->pagelist) { |
9a298b2a | 97 | kfree(entry); |
1da177e4 LT |
98 | return -ENOMEM; |
99 | } | |
100 | ||
101 | memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist)); | |
102 | ||
9a298b2a | 103 | entry->busaddr = kmalloc(pages * sizeof(*entry->busaddr), GFP_KERNEL); |
b5e89ed5 | 104 | if (!entry->busaddr) { |
9a298b2a EA |
105 | kfree(entry->pagelist); |
106 | kfree(entry); | |
1da177e4 LT |
107 | return -ENOMEM; |
108 | } | |
b5e89ed5 DA |
109 | memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr)); |
110 | ||
6876b3ba | 111 | entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT); |
b5e89ed5 | 112 | if (!entry->virtual) { |
9a298b2a EA |
113 | kfree(entry->busaddr); |
114 | kfree(entry->pagelist); | |
115 | kfree(entry); | |
1da177e4 LT |
116 | 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 | */ | |
b5e89ed5 | 122 | memset(entry->virtual, 0, pages << PAGE_SHIFT); |
1da177e4 | 123 | |
d1f2b55a | 124 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
1da177e4 | 125 | |
3e684eae MN |
126 | DRM_DEBUG("handle = %08lx\n", entry->handle); |
127 | DRM_DEBUG("virtual = %p\n", entry->virtual); | |
1da177e4 | 128 | |
b5e89ed5 DA |
129 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
130 | i += PAGE_SIZE, j++) { | |
1da177e4 LT |
131 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
132 | if (!entry->pagelist[j]) | |
133 | goto failed; | |
134 | SetPageReserved(entry->pagelist[j]); | |
135 | } | |
136 | ||
c153f45f | 137 | request->handle = entry->handle; |
1da177e4 LT |
138 | |
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 | { | |
b5e89ed5 | 146 | int error = 0; |
1da177e4 | 147 | |
b5e89ed5 DA |
148 | for (i = 0; i < pages; i++) { |
149 | unsigned long *tmp; | |
1da177e4 | 150 | |
b5e89ed5 DA |
151 | 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; | |
1da177e4 LT |
174 | } |
175 | } | |
b5e89ed5 DA |
176 | if (error == 0) |
177 | DRM_ERROR("Scatter allocation matches pagelist\n"); | |
1da177e4 LT |
178 | } |
179 | #endif | |
180 | ||
181 | return 0; | |
182 | ||
b5e89ed5 DA |
183 | failed: |
184 | drm_sg_cleanup(entry); | |
1da177e4 LT |
185 | return -ENOMEM; |
186 | } | |
c153f45f EA |
187 | EXPORT_SYMBOL(drm_sg_alloc); |
188 | ||
1da177e4 | 189 | |
c153f45f EA |
190 | int drm_sg_alloc_ioctl(struct drm_device *dev, void *data, |
191 | struct drm_file *file_priv) | |
1da177e4 | 192 | { |
c153f45f EA |
193 | struct drm_scatter_gather *request = data; |
194 | ||
195 | return drm_sg_alloc(dev, request); | |
196 | ||
197 | } | |
198 | ||
199 | int drm_sg_free(struct drm_device *dev, void *data, | |
200 | struct drm_file *file_priv) | |
201 | { | |
202 | struct drm_scatter_gather *request = data; | |
55910517 | 203 | struct drm_sg_mem *entry; |
1da177e4 LT |
204 | |
205 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
206 | return -EINVAL; | |
207 | ||
1da177e4 LT |
208 | entry = dev->sg; |
209 | dev->sg = NULL; | |
210 | ||
c153f45f | 211 | if (!entry || entry->handle != request->handle) |
1da177e4 LT |
212 | return -EINVAL; |
213 | ||
3e684eae | 214 | DRM_DEBUG("virtual = %p\n", entry->virtual); |
1da177e4 | 215 | |
b5e89ed5 | 216 | drm_sg_cleanup(entry); |
1da177e4 LT |
217 | |
218 | return 0; | |
219 | } |