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