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 | ||
0500c04e | 34 | #include <linux/mm.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
0500c04e SR |
36 | #include <linux/vmalloc.h> |
37 | ||
38 | #include <drm/drm.h> | |
39 | #include <drm/drm_drv.h> | |
40 | #include <drm/drm_print.h> | |
41 | ||
9ec4e2ff | 42 | #include "drm_legacy.h" |
1da177e4 LT |
43 | |
44 | #define DEBUG_SCATTER 0 | |
45 | ||
6876b3ba BH |
46 | static inline void *drm_vmalloc_dma(unsigned long size) |
47 | { | |
48 | #if defined(__powerpc__) && defined(CONFIG_NOT_COHERENT_CACHE) | |
37035e74 | 49 | return __vmalloc(size, GFP_KERNEL, pgprot_noncached_wc(PAGE_KERNEL)); |
6876b3ba BH |
50 | #else |
51 | return vmalloc_32(size); | |
52 | #endif | |
53 | } | |
54 | ||
3d914e83 | 55 | static void drm_sg_cleanup(struct drm_sg_mem * entry) |
1da177e4 LT |
56 | { |
57 | struct page *page; | |
58 | int i; | |
59 | ||
b5e89ed5 | 60 | for (i = 0; i < entry->pages; i++) { |
1da177e4 | 61 | page = entry->pagelist[i]; |
b5e89ed5 DA |
62 | if (page) |
63 | ClearPageReserved(page); | |
1da177e4 LT |
64 | } |
65 | ||
b5e89ed5 DA |
66 | vfree(entry->virtual); |
67 | ||
9a298b2a EA |
68 | kfree(entry->busaddr); |
69 | kfree(entry->pagelist); | |
70 | kfree(entry); | |
1da177e4 LT |
71 | } |
72 | ||
3d914e83 DV |
73 | void drm_legacy_sg_cleanup(struct drm_device *dev) |
74 | { | |
75 | if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && | |
fa538645 | 76 | drm_core_check_feature(dev, DRIVER_LEGACY)) { |
3d914e83 DV |
77 | drm_sg_cleanup(dev->sg); |
78 | dev->sg = NULL; | |
79 | } | |
80 | } | |
d1f2b55a DA |
81 | #ifdef _LP64 |
82 | # define ScatterHandle(x) (unsigned int)((x >> 32) + (x & ((1L << 32) - 1))) | |
83 | #else | |
84 | # define ScatterHandle(x) (unsigned int)(x) | |
85 | #endif | |
86 | ||
9ec4e2ff DV |
87 | int drm_legacy_sg_alloc(struct drm_device *dev, void *data, |
88 | struct drm_file *file_priv) | |
1da177e4 | 89 | { |
1d8d29cf | 90 | struct drm_scatter_gather *request = data; |
55910517 | 91 | struct drm_sg_mem *entry; |
1da177e4 LT |
92 | unsigned long pages, i, j; |
93 | ||
3e684eae | 94 | DRM_DEBUG("\n"); |
1da177e4 | 95 | |
fa538645 | 96 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
69fdf420 | 97 | return -EOPNOTSUPP; |
8e194bbf | 98 | |
1da177e4 | 99 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
69fdf420 | 100 | return -EOPNOTSUPP; |
1da177e4 | 101 | |
b5e89ed5 | 102 | if (dev->sg) |
1da177e4 LT |
103 | return -EINVAL; |
104 | ||
f35119d6 | 105 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
b5e89ed5 | 106 | if (!entry) |
1da177e4 LT |
107 | return -ENOMEM; |
108 | ||
c153f45f | 109 | pages = (request->size + PAGE_SIZE - 1) / PAGE_SIZE; |
3e684eae | 110 | DRM_DEBUG("size=%ld pages=%ld\n", request->size, pages); |
1da177e4 LT |
111 | |
112 | entry->pages = pages; | |
f35119d6 | 113 | entry->pagelist = kcalloc(pages, sizeof(*entry->pagelist), GFP_KERNEL); |
b5e89ed5 | 114 | if (!entry->pagelist) { |
9a298b2a | 115 | kfree(entry); |
1da177e4 LT |
116 | return -ENOMEM; |
117 | } | |
118 | ||
f35119d6 | 119 | entry->busaddr = kcalloc(pages, sizeof(*entry->busaddr), GFP_KERNEL); |
b5e89ed5 | 120 | if (!entry->busaddr) { |
9a298b2a EA |
121 | kfree(entry->pagelist); |
122 | kfree(entry); | |
1da177e4 LT |
123 | return -ENOMEM; |
124 | } | |
b5e89ed5 | 125 | |
6876b3ba | 126 | entry->virtual = drm_vmalloc_dma(pages << PAGE_SHIFT); |
b5e89ed5 | 127 | if (!entry->virtual) { |
9a298b2a EA |
128 | kfree(entry->busaddr); |
129 | kfree(entry->pagelist); | |
130 | kfree(entry); | |
1da177e4 LT |
131 | return -ENOMEM; |
132 | } | |
133 | ||
134 | /* This also forces the mapping of COW pages, so our page list | |
135 | * will be valid. Please don't remove it... | |
136 | */ | |
b5e89ed5 | 137 | memset(entry->virtual, 0, pages << PAGE_SHIFT); |
1da177e4 | 138 | |
d1f2b55a | 139 | entry->handle = ScatterHandle((unsigned long)entry->virtual); |
1da177e4 | 140 | |
3e684eae MN |
141 | DRM_DEBUG("handle = %08lx\n", entry->handle); |
142 | DRM_DEBUG("virtual = %p\n", entry->virtual); | |
1da177e4 | 143 | |
b5e89ed5 DA |
144 | for (i = (unsigned long)entry->virtual, j = 0; j < pages; |
145 | i += PAGE_SIZE, j++) { | |
1da177e4 LT |
146 | entry->pagelist[j] = vmalloc_to_page((void *)i); |
147 | if (!entry->pagelist[j]) | |
148 | goto failed; | |
149 | SetPageReserved(entry->pagelist[j]); | |
150 | } | |
151 | ||
c153f45f | 152 | request->handle = entry->handle; |
1da177e4 LT |
153 | |
154 | dev->sg = entry; | |
155 | ||
156 | #if DEBUG_SCATTER | |
157 | /* Verify that each page points to its virtual address, and vice | |
158 | * versa. | |
159 | */ | |
160 | { | |
b5e89ed5 | 161 | int error = 0; |
1da177e4 | 162 | |
b5e89ed5 DA |
163 | for (i = 0; i < pages; i++) { |
164 | unsigned long *tmp; | |
1da177e4 | 165 | |
b5e89ed5 DA |
166 | tmp = page_address(entry->pagelist[i]); |
167 | for (j = 0; | |
168 | j < PAGE_SIZE / sizeof(unsigned long); | |
169 | j++, tmp++) { | |
170 | *tmp = 0xcafebabe; | |
171 | } | |
172 | tmp = (unsigned long *)((u8 *) entry->virtual + | |
173 | (PAGE_SIZE * i)); | |
174 | for (j = 0; | |
175 | j < PAGE_SIZE / sizeof(unsigned long); | |
176 | j++, tmp++) { | |
177 | if (*tmp != 0xcafebabe && error == 0) { | |
178 | error = 1; | |
179 | DRM_ERROR("Scatter allocation error, " | |
180 | "pagelist does not match " | |
181 | "virtual mapping\n"); | |
182 | } | |
183 | } | |
184 | tmp = page_address(entry->pagelist[i]); | |
185 | for (j = 0; | |
186 | j < PAGE_SIZE / sizeof(unsigned long); | |
187 | j++, tmp++) { | |
188 | *tmp = 0; | |
1da177e4 LT |
189 | } |
190 | } | |
b5e89ed5 DA |
191 | if (error == 0) |
192 | DRM_ERROR("Scatter allocation matches pagelist\n"); | |
1da177e4 LT |
193 | } |
194 | #endif | |
195 | ||
196 | return 0; | |
197 | ||
b5e89ed5 DA |
198 | failed: |
199 | drm_sg_cleanup(entry); | |
1da177e4 LT |
200 | return -ENOMEM; |
201 | } | |
202 | ||
9ec4e2ff DV |
203 | int drm_legacy_sg_free(struct drm_device *dev, void *data, |
204 | struct drm_file *file_priv) | |
c153f45f EA |
205 | { |
206 | struct drm_scatter_gather *request = data; | |
55910517 | 207 | struct drm_sg_mem *entry; |
1da177e4 | 208 | |
fa538645 | 209 | if (!drm_core_check_feature(dev, DRIVER_LEGACY)) |
69fdf420 | 210 | return -EOPNOTSUPP; |
8e194bbf | 211 | |
1da177e4 | 212 | if (!drm_core_check_feature(dev, DRIVER_SG)) |
69fdf420 | 213 | return -EOPNOTSUPP; |
1da177e4 | 214 | |
1da177e4 LT |
215 | entry = dev->sg; |
216 | dev->sg = NULL; | |
217 | ||
c153f45f | 218 | if (!entry || entry->handle != request->handle) |
1da177e4 LT |
219 | return -EINVAL; |
220 | ||
3e684eae | 221 | DRM_DEBUG("virtual = %p\n", entry->virtual); |
1da177e4 | 222 | |
b5e89ed5 | 223 | drm_sg_cleanup(entry); |
1da177e4 LT |
224 | |
225 | return 0; | |
226 | } |