aboutsummaryrefslogtreecommitdiffstats
path: root/sound/core/memalloc.c
blob: f057430db0d01021d6b2c27df157b64a4958fd7a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
/*
 *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
 *                   Takashi Iwai <tiwai@suse.de>
 * 
 *  Generic memory allocators
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <sound/memalloc.h>
#ifdef CONFIG_SBUS
#include <asm/sbus.h>
#endif


MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("Memory allocator for ALSA system.");
MODULE_LICENSE("GPL");


/*
 */

void *snd_malloc_sgbuf_pages(struct device *device,
                             size_t size, struct snd_dma_buffer *dmab,
			     size_t *res_size);
int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);

/*
 */

static DEFINE_MUTEX(list_mutex);
static LIST_HEAD(mem_list_head);

/* buffer preservation list */
struct snd_mem_list {
	struct snd_dma_buffer buffer;
	unsigned int id;
	struct list_head list;
};

/* id for pre-allocated buffers */
#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1

#ifdef CONFIG_SND_DEBUG
#define __ASTRING__(x) #x
#define snd_assert(expr, args...) do {\
	if (!(expr)) {\
		printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
		args;\
	}\
} while (0)
#else
#define snd_assert(expr, args...) /**/
#endif

/*
 *  Hacks
 */

#if defined(__i386__)
/*
 * A hack to allocate large buffers via dma_alloc_coherent()
 *
 * since dma_alloc_coherent always tries GFP_DMA when the requested
 * pci memory region is below 32bit, it happens quite often that even
 * 2 order of pages cannot be allocated.
 *
 * so in the following, we allocate at first without dma_mask, so that
 * allocation will be done without GFP_DMA.  if the area doesn't match
 * with the requested region, then realloate with the original dma_mask
 * again.
 *
 * Really, we want to move this type of thing into dma_alloc_coherent()
 * so dma_mask doesn't have to be messed with.
 */

static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
					 dma_addr_t *dma_handle,
					 gfp_t flags)
{
	void *ret;
	u64 dma_mask, coherent_dma_mask;

	if (dev == NULL || !dev->dma_mask)
		return dma_alloc_coherent(dev, size, dma_handle, flags);
	dma_mask = *dev->dma_mask;
	coherent_dma_mask = dev->coherent_dma_mask;
	*dev->dma_mask = 0xffffffff; 	/* do without masking */
	dev->coherent_dma_mask = 0xffffffff; 	/* do without masking */
	ret = dma_alloc_coherent(dev, size, dma_handle, flags);
	*dev->dma_mask = dma_mask;	/* restore */
	dev->coherent_dma_mask = coherent_dma_mask;	/* restore */
	if (ret) {
		/* obtained address is out of range? */
		if (((unsigned long)*dma_handle + size - 1) & ~dma_mask) {
			/* reallocate with the proper mask */
			dma_free_coherent(dev, size, ret, *dma_handle);
			ret = dma_alloc_coherent(dev, size, dma_handle, flags);
		}
	} else {
		/* wish to success now with the proper mask... */
		if (dma_mask != 0xffffffffUL) {
			/* allocation with GFP_ATOMIC to avoid the long stall */
			flags &= ~GFP_KERNEL;
			flags |= GFP_ATOMIC;
			ret = dma_alloc_coherent(dev, size, dma_handle, flags);
		}
	}
	return ret;
}

/* redefine dma_alloc_coherent for some architectures */
#undef dma_alloc_coherent
#define dma_alloc_coherent snd_dma_hack_alloc_coherent

#endif /* arch */

/*
 *
 *  Generic memory allocators
 *
 */

static long snd_allocated_pages; /* holding the number of allocated pages */

static inline void inc_snd_pages(int order)
{
	snd_allocated_pages += 1 << order;
}

static inline void dec_snd_pages(int order)
{
	snd_allocated_pages -= 1 << order;
}

/**
 * snd_malloc_pages - allocate pages with the given size
 * @size: the size to allocate in bytes
 * @gfp_flags: the allocation conditions, GFP_XXX
 *
 * Allocates the physically contiguous pages with the given size.
 *
 * Returns the pointer of the buffer, or NULL if no enoguh memory.
 */
void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
{
	int pg;
	void *res;

	snd_assert(size > 0, return NULL);
	snd_assert(gfp_flags != 0, return NULL);
	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */
	pg = get_order(size);
	if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
		inc_snd_pages(pg);
	return res;
}

/**
 * snd_free_pages - release the pages
 * @ptr: the buffer pointer to release
 * @size: the allocated buffer size
 *
 * Releases the buffer allocated via snd_malloc_pages().
 */
void snd_free_pages(void *ptr, size_t size)
{
	int pg;

	if (ptr == NULL)
		return;
	pg = get_order(size);
	dec_snd_pages(pg);
	free_pages((unsigned long) ptr, pg);
}

/*
 *
 *  Bus-specific memory allocators
 *
 */

/* allocate the coherent DMA pages */
static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
{
	int pg;
	void *res;
	gfp_t gfp_flags;

	snd_assert(size > 0, return NULL);
	snd_assert(dma != NULL, return NULL);
	pg = get_order(size);
	gfp_flags = GFP_KERNEL
		| __GFP_COMP	/* compound page lets parts be mapped */
		| __GFP_NORETRY /* don't trigger OOM-killer */
		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
	res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
	if (res != NULL)
		inc_snd_pages(pg);

	return res;
}

/* free the coherent DMA pages */
static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
			       dma_addr_t dma)
{
	int pg;

	if (ptr == NULL)
		return;
	pg = get_order(size);
	dec_snd_pages(pg);
	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
}

#ifdef CONFIG_SBUS

static void *snd_malloc_sbus_pages(struct device *dev, size_t size,
				   dma_addr_t *dma_addr)
{
	struct sbus_dev *sdev = (struct sbus_dev *)dev;
	int pg;
	void *res;

	snd_assert(size > 0, return NULL);
	snd_assert(dma_addr != NULL, return NULL);
	pg = get_order(size);
	res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr);
	if (res != NULL)
		inc_snd_pages(pg);
	return res;
}

static void snd_free_sbus_pages(struct device *dev, size_t size,
				void *ptr, dma_addr_t dma_addr)
{
	struct sbus_dev *sdev = (struct sbus_dev *)dev;
	int pg;

	if (ptr == NULL)
		return;
	pg = get_order(size);
	dec_snd_pages(pg);
	sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr);
}

#endif /* CONFIG_SBUS */

/*
 *
 *  ALSA generic memory management
 *
 */


/**
 * snd_dma_alloc_pages - allocate the buffer area according to the given type
 * @type: the DMA buffer type
 * @device: the device pointer
 * @size: the buffer size to allocate
 * @dmab: buffer allocation record to store the allocated data
 *
 * Calls the memory-allocator function for the corresponding
 * buffer type.
 * 
 * Returns zero if the buffer with the given size is allocated successfuly,
 * other a negative value at error.
 */
int snd_dma_alloc_pages(int type, struct device *device, size_t size,
			struct snd_dma_buffer *dmab)
{
	snd_assert(size > 0, return -ENXIO);
	snd_assert(dmab != NULL, return -ENXIO);

	dmab->dev.type = type;
	dmab->dev.dev = device;
	dmab->bytes = 0;
	switch (type) {
	case SNDRV_DMA_TYPE_CONTINUOUS:
		dmab->area = snd_malloc_pages(size, (unsigned long)device);
		dmab->addr = 0;
		break;
#ifdef CONFIG_SBUS
	case SNDRV_DMA_TYPE_SBUS:
		dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr);
		break;
#endif
	case SNDRV_DMA_TYPE_DEV:
		dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
		break;
	case SNDRV_DMA_TYPE_DEV_SG:
		snd_malloc_sgbuf_pages(device, size, dmab, NULL);
		break;
	default:
		printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
		dmab->area = NULL;
		dmab->addr = 0;
		return -ENXIO;
	}
	if (! dmab->area)
		return -ENOMEM;
	dmab->bytes = size;
	return 0;
}

/**
 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
 * @type: the DMA buffer type
 * @device: the device pointer
 * @size: the buffer size to allocate
 * @dmab: buffer allocation record to store the allocated data
 *
 * Calls the memory-allocator function for the corresponding
 * buffer type.  When no space is left, this function reduces the size and
 * tries to allocate again.  The size actually allocated is stored in
 * res_size argument.
 * 
 * Returns zero if the buffer with the given size is allocated successfuly,
 * other a negative value at error.
 */
int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
				 struct snd_dma_buffer *dmab)
{
	int err;

	snd_assert(size > 0, return -ENXIO);
	snd_assert(dmab != NULL, return -ENXIO);

	while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
		if (err != -ENOMEM)
			return err;
		size >>= 1;
		if (size <= PAGE_SIZE)
			return -ENOMEM;
	}
	if (! dmab->area)
		return -ENOMEM;
	return 0;
}


/**
 * snd_dma_free_pages - release the allocated buffer
 * @dmab: the buffer allocation record to release
 *
 * Releases the allocated buffer via snd_dma_alloc_pages().
 */
void snd_dma_free_pages(struct snd_dma_buffer *dmab)
{
	switch (dmab->dev.type) {
	case SNDRV_DMA_TYPE_CONTINUOUS:
		snd_free_pages(dmab->area, dmab->bytes);
		break;
#ifdef CONFIG_SBUS
	case SNDRV_DMA_TYPE_SBUS:
		snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
		break;
#endif
	case SNDRV_DMA_TYPE_DEV:
		snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
		break;
	case SNDRV_DMA_TYPE_DEV_SG:
		snd_free_sgbuf_pages(dmab);
		break;
	default:
		printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
	}
}


/**
 * snd_dma_get_reserved - get the reserved buffer for the given device
 * @dmab: the buffer allocation record to store
 * @id: the buffer id
 *
 * Looks for the reserved-buffer list and re-uses if the same buffer
 * is found in the list.  When the buffer is found, it's removed from the free list.
 *
 * Returns the size of buffer if the buffer is found, or zero if not found.
 */
size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
{
	struct snd_mem_list *mem;

	snd_assert(dmab, return 0);

	mutex_lock(&list_mutex);
	list_for_each_entry(mem, &mem_list_head, list) {
		if (mem->id == id &&
		    (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
		     ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
			struct device *dev = dmab->dev.dev;
			list_del(&mem->list);
			*dmab = mem->buffer;
			if (dmab->dev.dev == NULL)
				dmab->dev.dev = dev;
			kfree(mem);
			mutex_unlock(&list_mutex);
			return dmab->bytes;
		}
	}
	mutex_unlock(&list_mutex);
	return 0;
}

/**
 * snd_dma_reserve_buf - reserve the buffer
 * @dmab: the buffer to reserve
 * @id: the buffer id
 *
 * Reserves the given buffer as a reserved buffer.
 * 
 * Returns zero if successful, or a negative code at error.
 */
int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
{
	struct snd_mem_list *mem;

	snd_assert(dmab, return -EINVAL);
	mem = kmalloc(sizeof(*mem), GFP_KERNEL);
	if (! mem)
		return -ENOMEM;
	mutex_lock(&list_mutex);
	mem->buffer = *dmab;
	mem->id = id;
	list_add_tail(&mem->list, &mem_list_head);
	mutex_unlock(&list_mutex);
	return 0;
}

/*
 * purge all reserved buffers
 */
static void free_all_reserved_pages(void)
{
	struct list_head *p;
	struct snd_mem_list *mem;

	mutex_lock(&list_mutex);
	while (! list_empty(&mem_list_head)) {
		p = mem_list_head.next;
		mem = list_entry(p, struct snd_mem_list, list);
		list_del(p);
		snd_dma_free_pages(&mem->buffer);
		kfree(mem);
	}
	mutex_unlock(&list_mutex);
}


#ifdef CONFIG_PROC_FS
/*
 * proc file interface
 */
#define SND_MEM_PROC_FILE	"driver/snd-page-alloc"
static struct proc_dir_entry *snd_mem_proc;

static int snd_mem_proc_read(char *page, char **start, off_t off,
			     int count, int *eof, void *data)
{
	int len = 0;
	long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
	struct snd_mem_list *mem;
	int devno;
	static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };

	mutex_lock(&list_mutex);
	len += snprintf(page + len, count - len,
			"pages  : %li bytes (%li pages per %likB)\n",
			pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
	devno = 0;
	list_for_each_entry(mem, &mem_list_head, list) {
		devno++;
		len += snprintf(page + len, count - len,
				"buffer %d : ID %08x : type %s\n",
				devno, mem->id, types[mem->buffer.dev.type]);
		len += snprintf(page + len, count - len,
				"  addr = 0x%lx, size = %d bytes\n",
				(unsigned long)mem->buffer.addr, (int)mem->buffer.bytes);
	}
	mutex_unlock(&list_mutex);
	return len;
}

/* FIXME: for pci only - other bus? */
#ifdef CONFIG_PCI
#define gettoken(bufp) strsep(bufp, " \t\n")

static int snd_mem_proc_write(struct file *file, const char __user *buffer,
			      unsigned long count, void *data)
{
	char buf[128];
	char *token, *p;

	if (count > ARRAY_SIZE(buf) - 1)
		count = ARRAY_SIZE(buf) - 1;
	if (copy_from_user(buf, buffer, count))
		return -EFAULT;
	buf[ARRAY_SIZE(buf) - 1] = '\0';

	p = buf;
	token = gettoken(&p);
	if (! token || *token == '#')
		return (int)count;
	if (strcmp(token, "add") == 0) {
		char *endp;
		int vendor, device, size, buffers;
		long mask;
		int i, alloced;
		struct pci_dev *pci;

		if ((token = gettoken(&p)) == NULL ||
		    (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
		    (token = gettoken(&p)) == NULL ||
		    (device = simple_strtol(token, NULL, 0)) <= 0 ||
		    (token = gettoken(&p)) == NULL ||
		    (mask = simple_strtol(token, NULL, 0)) < 0 ||
		    (token = gettoken(&p)) == NULL ||
		    (size = memparse(token, &endp)) < 64*1024 ||
		    size > 16*1024*1024 /* too big */ ||
		    (token = gettoken(&p)) == NULL ||
		    (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
		    buffers > 4) {
			printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
			return (int)count;
		}
		vendor &= 0xffff;
		device &= 0xffff;

		alloced = 0;
		pci = NULL;
		while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
			if (mask > 0 && mask < 0xffffffff) {
				if (pci_set_dma_mask(pci, mask) < 0 ||
				    pci_set_consistent_dma_mask(pci, mask) < 0) {
					printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
					return (int)count;
				}
			}
			for (i = 0; i < buffers; i++) {
				struct snd_dma_buffer dmab;
				memset(&dmab, 0, sizeof(dmab));
				if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
							size, &dmab) < 0) {
					printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
					pci_dev_put(pci);
					return (int)count;
				}
				snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
			}
			alloced++;
		}
		if (! alloced) {
			for (i = 0; i < buffers; i++) {
				struct snd_dma_buffer dmab;
				memset(&dmab, 0, sizeof(dmab));
				/* FIXME: We can allocate only in ZONE_DMA
				 * without a device pointer!
				 */
				if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
							size, &dmab) < 0) {
					printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
					break;
				}
				snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
			}
		}
	} else if (strcmp(token, "erase") == 0)
		/* FIXME: need for releasing each buffer chunk? */
		free_all_reserved_pages();
	else
		printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
	return (int)count;
}
#endif /* CONFIG_PCI */
#endif /* CONFIG_PROC_FS */

/*
 * module entry
 */

static int __init snd_mem_init(void)
{
#ifdef CONFIG_PROC_FS
	snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL);
	if (snd_mem_proc) {
		snd_mem_proc->read_proc = snd_mem_proc_read;
#ifdef CONFIG_PCI
		snd_mem_proc->write_proc = snd_mem_proc_write;
#endif
	}
#endif
	return 0;
}

static void __exit snd_mem_exit(void)
{
	remove_proc_entry(SND_MEM_PROC_FILE, NULL);
	free_all_reserved_pages();
	if (snd_allocated_pages > 0)
		printk(KERN_ERR "snd-malloc: Memory leak?  pages not freed = %li\n", snd_allocated_pages);
}


module_init(snd_mem_init)
module_exit(snd_mem_exit)


/*
 * exports
 */
EXPORT_SYMBOL(snd_dma_alloc_pages);
EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
EXPORT_SYMBOL(snd_dma_free_pages);

EXPORT_SYMBOL(snd_dma_get_reserved_buf);
EXPORT_SYMBOL(snd_dma_reserve_buf);

EXPORT_SYMBOL(snd_malloc_pages);
EXPORT_SYMBOL(snd_free_pages);