1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
3 *
4 * Memory allocation helpers.
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #include <sound/driver.h>
24 #include <asm/io.h>
25 #include <asm/uaccess.h>
26 #include <linux/init.h>
27 #include <linux/slab.h>
28 #include <linux/time.h>
29 #include <linux/pci.h>
30 #include <sound/core.h>
31 #include <sound/info.h>
32
33 /*
34 * memory allocation helpers and debug routines
35 */
36
37 #ifdef CONFIG_SND_DEBUG_MEMORY
38
39 struct snd_alloc_track {
40 unsigned long magic;
41 void *caller;
42 size_t size;
43 struct list_head list;
44 long data[0];
45 };
46
47 #define snd_alloc_track_entry(obj) (struct snd_alloc_track *)((char*)obj - (unsigned long)((struct snd_alloc_track *)0)->data)
48
49 static long snd_alloc_kmalloc;
50 static long snd_alloc_vmalloc;
51 static LIST_HEAD(snd_alloc_kmalloc_list);
52 static LIST_HEAD(snd_alloc_vmalloc_list);
53 static spinlock_t snd_alloc_kmalloc_lock = SPIN_LOCK_UNLOCKED;
54 static spinlock_t snd_alloc_vmalloc_lock = SPIN_LOCK_UNLOCKED;
55 #define KMALLOC_MAGIC 0x87654321
56 #define VMALLOC_MAGIC 0x87654320
57 static snd_info_entry_t *snd_memory_info_entry;
58
59 void snd_memory_init(void)
60 {
61 snd_alloc_kmalloc = 0;
62 snd_alloc_vmalloc = 0;
63 }
64
65 void snd_memory_done(void)
66 {
67 struct list_head *head;
68 struct snd_alloc_track *t;
69
70 if (snd_alloc_kmalloc > 0)
71 snd_printk(KERN_ERR "Not freed snd_alloc_kmalloc = %li\n", snd_alloc_kmalloc);
72 if (snd_alloc_vmalloc > 0)
73 snd_printk(KERN_ERR "Not freed snd_alloc_vmalloc = %li\n", snd_alloc_vmalloc);
74 list_for_each_prev(head, &snd_alloc_kmalloc_list) {
75 t = list_entry(head, struct snd_alloc_track, list);
76 if (t->magic != KMALLOC_MAGIC) {
77 snd_printk(KERN_ERR "Corrupted kmalloc\n");
78 break;
79 }
80 snd_printk(KERN_ERR "kmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);
81 }
82 list_for_each_prev(head, &snd_alloc_vmalloc_list) {
83 t = list_entry(head, struct snd_alloc_track, list);
84 if (t->magic != VMALLOC_MAGIC) {
85 snd_printk(KERN_ERR "Corrupted vmalloc\n");
86 break;
87 }
88 snd_printk(KERN_ERR "vmalloc(%ld) from %p not freed\n", (long) t->size, t->caller);
89 }
90 }
91
92 static void *__snd_kmalloc(size_t size, int flags, void *caller)
93 {
94 unsigned long cpu_flags;
95 struct snd_alloc_track *t;
96 void *ptr;
97
98 ptr = snd_wrapper_kmalloc(size + sizeof(struct snd_alloc_track), flags);
99 if (ptr != NULL) {
100 t = (struct snd_alloc_track *)ptr;
101 t->magic = KMALLOC_MAGIC;
102 t->caller = caller;
103 spin_lock_irqsave(&snd_alloc_kmalloc_lock, cpu_flags);
104 list_add_tail(&t->list, &snd_alloc_kmalloc_list);
105 spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, cpu_flags);
106 t->size = size;
107 snd_alloc_kmalloc += size;
108 ptr = t->data;
109 }
110 return ptr;
111 }
112
113 #define _snd_kmalloc(size, flags) __snd_kmalloc((size), (flags), __builtin_return_address(0));
114 void *snd_hidden_kmalloc(size_t size, int flags)
115 {
116 return _snd_kmalloc(size, flags);
117 }
118
119 void *snd_hidden_kcalloc(size_t n, size_t size, int flags)
120 {
121 void *ret = NULL;
122 if (n != 0 && size > INT_MAX / n)
123 return ret;
124 ret = _snd_kmalloc(n * size, flags);
125 if (ret)
126 memset(ret, 0, n * size);
127 return ret;
128 }
129
130 void snd_hidden_kfree(const void *obj)
131 {
132 unsigned long flags;
133 struct snd_alloc_track *t;
134 if (obj == NULL)
135 return;
136 t = snd_alloc_track_entry(obj);
137 if (t->magic != KMALLOC_MAGIC) {
138 snd_printk(KERN_WARNING "bad kfree (called from %p)\n", __builtin_return_address(0));
139 return;
140 }
141 spin_lock_irqsave(&snd_alloc_kmalloc_lock, flags);
142 list_del(&t->list);
143 spin_unlock_irqrestore(&snd_alloc_kmalloc_lock, flags);
144 t->magic = 0;
145 snd_alloc_kmalloc -= t->size;
146 obj = t;
147 snd_wrapper_kfree(obj);
148 }
149
150 void *snd_hidden_vmalloc(unsigned long size)
151 {
152 void *ptr;
153 ptr = snd_wrapper_vmalloc(size + sizeof(struct snd_alloc_track));
154 if (ptr) {
155 struct snd_alloc_track *t = (struct snd_alloc_track *)ptr;
156 t->magic = VMALLOC_MAGIC;
157 t->caller = __builtin_return_address(0);
158 spin_lock(&snd_alloc_vmalloc_lock);
159 list_add_tail(&t->list, &snd_alloc_vmalloc_list);
160 spin_unlock(&snd_alloc_vmalloc_lock);
161 t->size = size;
162 snd_alloc_vmalloc += size;
163 ptr = t->data;
164 }
165 return ptr;
166 }
167
168 void snd_hidden_vfree(void *obj)
169 {
170 struct snd_alloc_track *t;
171 if (obj == NULL)
172 return;
173 t = snd_alloc_track_entry(obj);
174 if (t->magic != VMALLOC_MAGIC) {
175 snd_printk(KERN_ERR "bad vfree (called from %p)\n", __builtin_return_address(0));
176 return;
177 }
178 spin_lock(&snd_alloc_vmalloc_lock);
179 list_del(&t->list);
180 spin_unlock(&snd_alloc_vmalloc_lock);
181 t->magic = 0;
182 snd_alloc_vmalloc -= t->size;
183 obj = t;
184 snd_wrapper_vfree(obj);
185 }
186
187 static void snd_memory_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
188 {
189 snd_iprintf(buffer, "kmalloc: %li bytes\n", snd_alloc_kmalloc);
190 snd_iprintf(buffer, "vmalloc: %li bytes\n", snd_alloc_vmalloc);
191 }
192
193 int __init snd_memory_info_init(void)
194 {
195 snd_info_entry_t *entry;
196
197 entry = snd_info_create_module_entry(THIS_MODULE, "meminfo", NULL);
198 if (entry) {
199 entry->c.text.read_size = 256;
200 entry->c.text.read = snd_memory_info_read;
201 if (snd_info_register(entry) < 0) {
202 snd_info_free_entry(entry);
203 entry = NULL;
204 }
205 }
206 snd_memory_info_entry = entry;
207 return 0;
208 }
209
210 int __exit snd_memory_info_done(void)
211 {
212 if (snd_memory_info_entry)
213 snd_info_unregister(snd_memory_info_entry);
214 return 0;
215 }
216
217 #else
218
219 #define _snd_kmalloc kmalloc
220
221 #endif /* CONFIG_SND_DEBUG_MEMORY */
222
223 /**
224 * snd_kmalloc_strdup - copy the string
225 * @string: the original string
226 * @flags: allocation conditions, GFP_XXX
227 *
228 * Allocates a memory chunk via kmalloc() and copies the string to it.
229 *
230 * Returns the pointer, or NULL if no enoguh memory.
231 */
232 char *snd_kmalloc_strdup(const char *string, int flags)
233 {
234 size_t len;
235 char *ptr;
236
237 if (!string)
238 return NULL;
239 len = strlen(string) + 1;
240 ptr = _snd_kmalloc(len, flags);
241 if (ptr)
242 memcpy(ptr, string, len);
243 return ptr;
244 }
245
246 /**
247 * copy_to_user_fromio - copy data from mmio-space to user-space
248 * @dst: the destination pointer on user-space
249 * @src: the source pointer on mmio
250 * @count: the data size to copy in bytes
251 *
252 * Copies the data from mmio-space to user-space.
253 *
254 * Returns zero if successful, or non-zero on failure.
255 */
256 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count)
257 {
258 #if defined(__i386__) || defined(CONFIG_SPARC32)
259 return copy_to_user(dst, (const void*)src, count) ? -EFAULT : 0;
260 #else
261 char buf[256];
262 while (count) {
263 size_t c = count;
264 if (c > sizeof(buf))
265 c = sizeof(buf);
266 memcpy_fromio(buf, (void __iomem *)src, c);
267 if (copy_to_user(dst, buf, c))
268 return -EFAULT;
269 count -= c;
270 dst += c;
271 src += c;
272 }
273 return 0;
274 #endif
275 }
276
277 /**
278 * copy_from_user_toio - copy data from user-space to mmio-space
279 * @dst: the destination pointer on mmio-space
280 * @src: the source pointer on user-space
281 * @count: the data size to copy in bytes
282 *
283 * Copies the data from user-space to mmio-space.
284 *
285 * Returns zero if successful, or non-zero on failure.
286 */
287 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
288 {
289 #if defined(__i386__) || defined(CONFIG_SPARC32)
290 return copy_from_user((void*)dst, src, count) ? -EFAULT : 0;
291 #else
292 char buf[256];
293 while (count) {
294 size_t c = count;
295 if (c > sizeof(buf))
296 c = sizeof(buf);
297 if (copy_from_user(buf, src, c))
298 return -EFAULT;
299 memcpy_toio(dst, buf, c);
300 count -= c;
301 dst += c;
302 src += c;
303 }
304 return 0;
305 #endif
306 }
307
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