Commit | Line | Data |
---|---|---|
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 LT |
34 | #include <linux/vmalloc.h> |
35 | #include "drmP.h" | |
36 | ||
37 | #define DEBUG_SCATTER 0 | |
38 | ||
6876b3ba BH |
39 | static inline void *drm_vmalloc_dma(unsigned long size) |
40 | { | |
41 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
42 | return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL | _PAGE_NO_CACHE); | |
43 | #else | |
44 | return vmalloc_32(size); | |
45 | #endif | |
46 | } | |
47 | ||
55910517 | 48 | void drm_sg_cleanup(struct drm_sg_mem * entry) |
1da177e4 LT |
49 | { |
50 | struct page *page; | |
51 | int i; | |
52 | ||
b5e89ed5 | 53 | for (i = 0; i < entry->pages; i++) { |
1da177e4 | 54 | page = entry->pagelist[i]; |
b5e89ed5 DA |
55 | if (page) |
56 | ClearPageReserved(page); | |
1da177e4 LT |
57 | } |
58 | ||
b5e89ed5 DA |
59 | vfree(entry->virtual); |
60 | ||
61 | drm_free(entry->busaddr, | |
62 | entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); | |
63 | drm_free(entry->pagelist, | |
64 | entry->pages * sizeof(*entry->pagelist), DRM_MEM_PAGES); | |
65 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); | |
1da177e4 LT |
66 | } |
67 | ||
d1f2b55a DA |
68 | #ifdef _LP64 |
69 | # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) | |
70 | #else | |
71 | # define ScatterHandle(x) (unsigned int)(x) | |
72 | #endif | |
73 | ||
c153f45f | 74 | int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) |
1da177e4 | 75 | { |
55910517 | 76 | struct drm_sg_mem *entry; |
1da177e4 LT |
77 | unsigned long pages, i, j; |
78 | ||
3e684eae | 79 | DRM_DEBUG("\n"); |
1da177e4 LT |
80 | |
81 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
82 | return -EINVAL; | |
83 | ||
b5e89ed5 | 84 | if (dev->sg) |
1da177e4 LT |
85 | return -EINVAL; |
86 | ||
b5e89ed5 DA |
87 | entry = drm_alloc(sizeof(*entry), DRM_MEM_SGLISTS); |
88 | if (!entry) | |
1da177e4 LT |
89 | return -ENOMEM; |
90 | ||
b5e89ed5 | 91 | memset(entry, 0, sizeof(*entry)); |
c153f45f | 92 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
3e684eae | 93 | DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages); |
1da177e4 LT |
94 | |
95 | entry->pages = pages; | |
b5e89ed5 DA |
96 | entry->pagelist = drm_alloc(pages * sizeof(*entry->pagelist), |
97 | DRM_MEM_PAGES); | |
98 | if (!entry->pagelist) { | |
99 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); | |
1da177e4 LT |
100 | return -ENOMEM; |
101 | } | |
102 | ||
103 | memset(entry->pagelist, 0, pages * sizeof(*entry->pagelist)); | |
104 | ||
b5e89ed5 DA |
105 | entry->busaddr = drm_alloc(pages * sizeof(*entry->busaddr), |
106 | DRM_MEM_PAGES); | |
107 | if (!entry->busaddr) { | |
108 | drm_free(entry->pagelist, | |
109 | entry->pages * sizeof(*entry->pagelist), | |
110 | DRM_MEM_PAGES); | |
111 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); | |
1da177e4 LT |
112 | return -ENOMEM; |
113 | } | |
b5e89ed5 DA |
114 | memset((void *)entry->busaddr, 0, pages * sizeof(*entry->busaddr)); |
115 | ||
6876b3ba | 116 | entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT); |
b5e89ed5 DA |
117 | if (!entry->virtual) { |
118 | drm_free(entry->busaddr, | |
119 | entry->pages * sizeof(*entry->busaddr), DRM_MEM_PAGES); | |
120 | drm_free(entry->pagelist, | |
121 | entry->pages * sizeof(*entry->pagelist), | |
122 | DRM_MEM_PAGES); | |
123 | drm_free(entry, sizeof(*entry), DRM_MEM_SGLISTS); | |
1da177e4 LT |
124 | return -ENOMEM; |
125 | } | |
126 | ||
127 | /* This also forces the mapping of COW pages, so our page list | |
128 | * will be valid. Please don't remove it... | |
129 | */ | |
b5e89ed5 | 130 | memset(entry->virtual, 0, pages << PAGE_SHIFT); |
1da177e4 | 131 | |
d1f2b55a | 132 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
1da177e4 | 133 | |
3e684eae MN |
134 | DRM_DEBUG("handle = %08lx\n", entry->handle); |
135 | DRM_DEBUG("virtual = %p\n", entry->virtual); | |
1da177e4 | 136 | |
b5e89ed5 DA |
137 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
138 | i += PAGE_SIZE, j++) { | |
1da177e4 LT |
139 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
140 | if (!entry->pagelist[j]) | |
141 | goto failed; | |
142 | SetPageReserved(entry->pagelist[j]); | |
143 | } | |
144 | ||
c153f45f | 145 | request->handle = entry->handle; |
1da177e4 LT |
146 | |
147 | dev->sg = entry; | |
148 | ||
149 | #if DEBUG_SCATTER | |
150 | /* Verify that each page points to its virtual address, and vice | |
151 | * versa. | |
152 | */ | |
153 | { | |
b5e89ed5 | 154 | int error = 0; |
1da177e4 | 155 | |
b5e89ed5 DA |
156 | for (i = 0; i < pages; i++) { |
157 | unsigned long *tmp; | |
1da177e4 | 158 | |
b5e89ed5 DA |
159 | tmp = page_address(entry->pagelist[i]); |
160 | for (j = 0; | |
161 | j < PAGE_SIZE / sizeof(unsigned long); | |
162 | j++, tmp++) { | |
163 | *tmp = 0xcafebabe; | |
164 | } | |
165 | tmp = (unsigned long *)((u8 *) entry->virtual + | |
166 | (PAGE_SIZE * i)); | |
167 | for (j = 0; | |
168 | j < PAGE_SIZE / sizeof(unsigned long); | |
169 | j++, tmp++) { | |
170 | if (*tmp != 0xcafebabe && error == 0) { | |
171 | error = 1; | |
172 | DRM_ERROR("Scatter allocation error, " | |
173 | "pagelist does not match " | |
174 | "virtual mapping\n"); | |
175 | } | |
176 | } | |
177 | tmp = page_address(entry->pagelist[i]); | |
178 | for (j = 0; | |
179 | j < PAGE_SIZE / sizeof(unsigned long); | |
180 | j++, tmp++) { | |
181 | *tmp = 0; | |
1da177e4 LT |
182 | } |
183 | } | |
b5e89ed5 DA |
184 | if (error == 0) |
185 | DRM_ERROR("Scatter allocation matches pagelist\n"); | |
1da177e4 LT |
186 | } |
187 | #endif | |
188 | ||
189 | return 0; | |
190 | ||
b5e89ed5 DA |
191 | failed: |
192 | drm_sg_cleanup(entry); | |
1da177e4 LT |
193 | return -ENOMEM; |
194 | } | |
c153f45f EA |
195 | EXPORT_SYMBOL(drm_sg_alloc); |
196 | ||
1da177e4 | 197 | |
c153f45f EA |
198 | int drm_sg_alloc_ioctl(struct drm_device *dev, void *data, |
199 | struct drm_file *file_priv) | |
1da177e4 | 200 | { |
c153f45f EA |
201 | struct drm_scatter_gather *request = data; |
202 | ||
203 | return drm_sg_alloc(dev, request); | |
204 | ||
205 | } | |
206 | ||
207 | int drm_sg_free(struct drm_device *dev, void *data, | |
208 | struct drm_file *file_priv) | |
209 | { | |
210 | struct drm_scatter_gather *request = data; | |
55910517 | 211 | struct drm_sg_mem *entry; |
1da177e4 LT |
212 | |
213 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
214 | return -EINVAL; | |
215 | ||
1da177e4 LT |
216 | entry = dev->sg; |
217 | dev->sg = NULL; | |
218 | ||
c153f45f | 219 | if (!entry || entry->handle != request->handle) |
1da177e4 LT |
220 | return -EINVAL; |
221 | ||
3e684eae | 222 | DRM_DEBUG("virtual = %p\n", entry->virtual); |
1da177e4 | 223 | |
b5e89ed5 | 224 | drm_sg_cleanup(entry); |
1da177e4 LT |
225 | |
226 | return 0; | |
227 | } |