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 | 34 | #include <linux/vmalloc.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
760285e7 | 36 | #include <drm/drmP.h> |
1da177e4 LT |
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 | ||
3d914e83 | 49 | static 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 | ||
3d914e83 DV |
67 | void drm_legacy_sg_cleanup(struct drm_device *dev) |
68 | { | |
69 | if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && | |
70 | !drm_core_check_feature(dev, DRIVER_MODESET)) { | |
71 | drm_sg_cleanup(dev->sg); | |
72 | dev->sg = NULL; | |
73 | } | |
74 | } | |
d1f2b55a DA |
75 | #ifdef _LP64 |
76 | # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) | |
77 | #else | |
78 | # define ScatterHandle(x) (unsigned int)(x) | |
79 | #endif | |
80 | ||
1d8d29cf DV |
81 | int drm_sg_alloc(struct drm_device *dev, void *data, |
82 | struct drm_file *file_priv) | |
1da177e4 | 83 | { |
1d8d29cf | 84 | struct drm_scatter_gather *request = data; |
55910517 | 85 | struct drm_sg_mem *entry; |
1da177e4 LT |
86 | unsigned long pages, i, j; |
87 | ||
3e684eae | 88 | DRM_DEBUG("\n"); |
1da177e4 LT |
89 | |
90 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
91 | return -EINVAL; | |
92 | ||
b5e89ed5 | 93 | if (dev->sg) |
1da177e4 LT |
94 | return -EINVAL; |
95 | ||
f35119d6 | 96 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
b5e89ed5 | 97 | if (!entry) |
1da177e4 LT |
98 | return -ENOMEM; |
99 | ||
c153f45f | 100 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
3e684eae | 101 | DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages); |
1da177e4 LT |
102 | |
103 | entry->pages = pages; | |
f35119d6 | 104 | entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL); |
b5e89ed5 | 105 | if (!entry->pagelist) { |
9a298b2a | 106 | kfree(entry); |
1da177e4 LT |
107 | return -ENOMEM; |
108 | } | |
109 | ||
f35119d6 | 110 | entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL); |
b5e89ed5 | 111 | if (!entry->busaddr) { |
9a298b2a EA |
112 | kfree(entry->pagelist); |
113 | kfree(entry); | |
1da177e4 LT |
114 | return -ENOMEM; |
115 | } | |
b5e89ed5 | 116 | |
6876b3ba | 117 | entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT); |
b5e89ed5 | 118 | if (!entry->virtual) { |
9a298b2a EA |
119 | kfree(entry->busaddr); |
120 | kfree(entry->pagelist); | |
121 | kfree(entry); | |
1da177e4 LT |
122 | return -ENOMEM; |
123 | } | |
124 | ||
125 | /* This also forces the mapping of COW pages, so our page list | |
126 | * will be valid. Please don't remove it... | |
127 | */ | |
b5e89ed5 | 128 | memset(entry->virtual, 0, pages << PAGE_SHIFT); |
1da177e4 | 129 | |
d1f2b55a | 130 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
1da177e4 | 131 | |
3e684eae MN |
132 | DRM_DEBUG("handle = %08lx\n", entry->handle); |
133 | DRM_DEBUG("virtual = %p\n", entry->virtual); | |
1da177e4 | 134 | |
b5e89ed5 DA |
135 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
136 | i += PAGE_SIZE, j++) { | |
1da177e4 LT |
137 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
138 | if (!entry->pagelist[j]) | |
139 | goto failed; | |
140 | SetPageReserved(entry->pagelist[j]); | |
141 | } | |
142 | ||
c153f45f | 143 | request->handle = entry->handle; |
1da177e4 LT |
144 | |
145 | dev->sg = entry; | |
146 | ||
147 | #if DEBUG_SCATTER | |
148 | /* Verify that each page points to its virtual address, and vice | |
149 | * versa. | |
150 | */ | |
151 | { | |
b5e89ed5 | 152 | int error = 0; |
1da177e4 | 153 | |
b5e89ed5 DA |
154 | for (i = 0; i < pages; i++) { |
155 | unsigned long *tmp; | |
1da177e4 | 156 | |
b5e89ed5 DA |
157 | tmp = page_address(entry->pagelist[i]); |
158 | for (j = 0; | |
159 | j < PAGE_SIZE / sizeof(unsigned long); | |
160 | j++, tmp++) { | |
161 | *tmp = 0xcafebabe; | |
162 | } | |
163 | tmp = (unsigned long *)((u8 *) entry->virtual + | |
164 | (PAGE_SIZE * i)); | |
165 | for (j = 0; | |
166 | j < PAGE_SIZE / sizeof(unsigned long); | |
167 | j++, tmp++) { | |
168 | if (*tmp != 0xcafebabe && error == 0) { | |
169 | error = 1; | |
170 | DRM_ERROR("Scatter allocation error, " | |
171 | "pagelist does not match " | |
172 | "virtual mapping\n"); | |
173 | } | |
174 | } | |
175 | tmp = page_address(entry->pagelist[i]); | |
176 | for (j = 0; | |
177 | j < PAGE_SIZE / sizeof(unsigned long); | |
178 | j++, tmp++) { | |
179 | *tmp = 0; | |
1da177e4 LT |
180 | } |
181 | } | |
b5e89ed5 DA |
182 | if (error == 0) |
183 | DRM_ERROR("Scatter allocation matches pagelist\n"); | |
1da177e4 LT |
184 | } |
185 | #endif | |
186 | ||
187 | return 0; | |
188 | ||
b5e89ed5 DA |
189 | failed: |
190 | drm_sg_cleanup(entry); | |
1da177e4 LT |
191 | return -ENOMEM; |
192 | } | |
193 | ||
c153f45f EA |
194 | int drm_sg_free(struct drm_device *dev, void *data, |
195 | struct drm_file *file_priv) | |
196 | { | |
197 | struct drm_scatter_gather *request = data; | |
55910517 | 198 | struct drm_sg_mem *entry; |
1da177e4 LT |
199 | |
200 | if (!drm_core_check_feature(dev, DRIVER_SG)) | |
201 | return -EINVAL; | |
202 | ||
1da177e4 LT |
203 | entry = dev->sg; |
204 | dev->sg = NULL; | |
205 | ||
c153f45f | 206 | if (!entry || entry->handle != request->handle) |
1da177e4 LT |
207 | return -EINVAL; |
208 | ||
3e684eae | 209 | DRM_DEBUG("virtual = %p\n", entry->virtual); |
1da177e4 | 210 | |
b5e89ed5 | 211 | drm_sg_cleanup(entry); |
1da177e4 LT |
212 | |
213 | return 0; | |
214 | } |