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24#include <linux/module.h>
25#include <linux/proc_fs.h>
26#include <linux/init.h>
27#include <linux/pci.h>
28#include <linux/slab.h>
29#include <linux/mm.h>
30#include <linux/seq_file.h>
31#include <asm/uaccess.h>
32#include <linux/dma-mapping.h>
33#include <linux/moduleparam.h>
34#include <linux/mutex.h>
35#include <sound/memalloc.h>
36#ifdef CONFIG_SBUS
37#include <asm/sbus.h>
38#endif
39
40
41MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
42MODULE_DESCRIPTION("Memory allocator for ALSA system.");
43MODULE_LICENSE("GPL");
44
45
46
47
48
49void *snd_malloc_sgbuf_pages(struct device *device,
50 size_t size, struct snd_dma_buffer *dmab,
51 size_t *res_size);
52int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
53
54
55
56
57static DEFINE_MUTEX(list_mutex);
58static LIST_HEAD(mem_list_head);
59
60
61struct snd_mem_list {
62 struct snd_dma_buffer buffer;
63 unsigned int id;
64 struct list_head list;
65};
66
67
68#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
69
70#ifdef CONFIG_SND_DEBUG
71#define __ASTRING__(x) #x
72#define snd_assert(expr, args...) do {\
73 if (!(expr)) {\
74 printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
75 args;\
76 }\
77} while (0)
78#else
79#define snd_assert(expr, args...)
80#endif
81
82
83
84
85
86#if defined(__i386__)
87
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102
103static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
104 dma_addr_t *dma_handle,
105 gfp_t flags)
106{
107 void *ret;
108 u64 dma_mask, coherent_dma_mask;
109
110 if (dev == NULL || !dev->dma_mask)
111 return dma_alloc_coherent(dev, size, dma_handle, flags);
112 dma_mask = *dev->dma_mask;
113 coherent_dma_mask = dev->coherent_dma_mask;
114 *dev->dma_mask = 0xffffffff;
115 dev->coherent_dma_mask = 0xffffffff;
116 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
117 *dev->dma_mask = dma_mask;
118 dev->coherent_dma_mask = coherent_dma_mask;
119 if (ret) {
120
121 if (((unsigned long)*dma_handle + size - 1) & ~dma_mask) {
122
123 dma_free_coherent(dev, size, ret, *dma_handle);
124 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
125 }
126 } else {
127
128 if (dma_mask != 0xffffffffUL) {
129
130 flags &= ~GFP_KERNEL;
131 flags |= GFP_ATOMIC;
132 ret = dma_alloc_coherent(dev, size, dma_handle, flags);
133 }
134 }
135 return ret;
136}
137
138
139#undef dma_alloc_coherent
140#define dma_alloc_coherent snd_dma_hack_alloc_coherent
141
142#endif
143
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148
149
150static long snd_allocated_pages;
151
152static inline void inc_snd_pages(int order)
153{
154 snd_allocated_pages += 1 << order;
155}
156
157static inline void dec_snd_pages(int order)
158{
159 snd_allocated_pages -= 1 << order;
160}
161
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170
171void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
172{
173 int pg;
174 void *res;
175
176 snd_assert(size > 0, return NULL);
177 snd_assert(gfp_flags != 0, return NULL);
178 gfp_flags |= __GFP_COMP;
179 pg = get_order(size);
180 if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
181 inc_snd_pages(pg);
182 return res;
183}
184
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190
191
192void snd_free_pages(void *ptr, size_t size)
193{
194 int pg;
195
196 if (ptr == NULL)
197 return;
198 pg = get_order(size);
199 dec_snd_pages(pg);
200 free_pages((unsigned long) ptr, pg);
201}
202
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206
207
208
209#ifdef CONFIG_HAS_DMA
210
211static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
212{
213 int pg;
214 void *res;
215 gfp_t gfp_flags;
216
217 snd_assert(size > 0, return NULL);
218 snd_assert(dma != NULL, return NULL);
219 pg = get_order(size);
220 gfp_flags = GFP_KERNEL
221 | __GFP_COMP
222 | __GFP_NORETRY
223 | __GFP_NOWARN;
224 res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
225 if (res != NULL)
226 inc_snd_pages(pg);
227
228 return res;
229}
230
231
232static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
233 dma_addr_t dma)
234{
235 int pg;
236
237 if (ptr == NULL)
238 return;
239 pg = get_order(size);
240 dec_snd_pages(pg);
241 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
242}
243#endif
244
245#ifdef CONFIG_SBUS
246
247static void *snd_malloc_sbus_pages(struct device *dev, size_t size,
248 dma_addr_t *dma_addr)
249{
250 struct sbus_dev *sdev = (struct sbus_dev *)dev;
251 int pg;
252 void *res;
253
254 snd_assert(size > 0, return NULL);
255 snd_assert(dma_addr != NULL, return NULL);
256 pg = get_order(size);
257 res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr);
258 if (res != NULL)
259 inc_snd_pages(pg);
260 return res;
261}
262
263static void snd_free_sbus_pages(struct device *dev, size_t size,
264 void *ptr, dma_addr_t dma_addr)
265{
266 struct sbus_dev *sdev = (struct sbus_dev *)dev;
267 int pg;
268
269 if (ptr == NULL)
270 return;
271 pg = get_order(size);
272 dec_snd_pages(pg);
273 sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr);
274}
275
276#endif
277
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298int snd_dma_alloc_pages(int type, struct device *device, size_t size,
299 struct snd_dma_buffer *dmab)
300{
301 snd_assert(size > 0, return -ENXIO);
302 snd_assert(dmab != NULL, return -ENXIO);
303
304 dmab->dev.type = type;
305 dmab->dev.dev = device;
306 dmab->bytes = 0;
307 switch (type) {
308 case SNDRV_DMA_TYPE_CONTINUOUS:
309 dmab->area = snd_malloc_pages(size, (unsigned long)device);
310 dmab->addr = 0;
311 break;
312#ifdef CONFIG_SBUS
313 case SNDRV_DMA_TYPE_SBUS:
314 dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr);
315 break;
316#endif
317#ifdef CONFIG_HAS_DMA
318 case SNDRV_DMA_TYPE_DEV:
319 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
320 break;
321 case SNDRV_DMA_TYPE_DEV_SG:
322 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
323 break;
324#endif
325 default:
326 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
327 dmab->area = NULL;
328 dmab->addr = 0;
329 return -ENXIO;
330 }
331 if (! dmab->area)
332 return -ENOMEM;
333 dmab->bytes = size;
334 return 0;
335}
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351
352int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
353 struct snd_dma_buffer *dmab)
354{
355 int err;
356
357 snd_assert(size > 0, return -ENXIO);
358 snd_assert(dmab != NULL, return -ENXIO);
359
360 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
361 if (err != -ENOMEM)
362 return err;
363 size >>= 1;
364 if (size <= PAGE_SIZE)
365 return -ENOMEM;
366 }
367 if (! dmab->area)
368 return -ENOMEM;
369 return 0;
370}
371
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375
376
377
378
379void snd_dma_free_pages(struct snd_dma_buffer *dmab)
380{
381 switch (dmab->dev.type) {
382 case SNDRV_DMA_TYPE_CONTINUOUS:
383 snd_free_pages(dmab->area, dmab->bytes);
384 break;
385#ifdef CONFIG_SBUS
386 case SNDRV_DMA_TYPE_SBUS:
387 snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
388 break;
389#endif
390#ifdef CONFIG_HAS_DMA
391 case SNDRV_DMA_TYPE_DEV:
392 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
393 break;
394 case SNDRV_DMA_TYPE_DEV_SG:
395 snd_free_sgbuf_pages(dmab);
396 break;
397#endif
398 default:
399 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
400 }
401}
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414size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
415{
416 struct snd_mem_list *mem;
417
418 snd_assert(dmab, return 0);
419
420 mutex_lock(&list_mutex);
421 list_for_each_entry(mem, &mem_list_head, list) {
422 if (mem->id == id &&
423 (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
424 ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
425 struct device *dev = dmab->dev.dev;
426 list_del(&mem->list);
427 *dmab = mem->buffer;
428 if (dmab->dev.dev == NULL)
429 dmab->dev.dev = dev;
430 kfree(mem);
431 mutex_unlock(&list_mutex);
432 return dmab->bytes;
433 }
434 }
435 mutex_unlock(&list_mutex);
436 return 0;
437}
438
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447
448int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
449{
450 struct snd_mem_list *mem;
451
452 snd_assert(dmab, return -EINVAL);
453 mem = kmalloc(sizeof(*mem), GFP_KERNEL);
454 if (! mem)
455 return -ENOMEM;
456 mutex_lock(&list_mutex);
457 mem->buffer = *dmab;
458 mem->id = id;
459 list_add_tail(&mem->list, &mem_list_head);
460 mutex_unlock(&list_mutex);
461 return 0;
462}
463
464
465
466
467static void free_all_reserved_pages(void)
468{
469 struct list_head *p;
470 struct snd_mem_list *mem;
471
472 mutex_lock(&list_mutex);
473 while (! list_empty(&mem_list_head)) {
474 p = mem_list_head.next;
475 mem = list_entry(p, struct snd_mem_list, list);
476 list_del(p);
477 snd_dma_free_pages(&mem->buffer);
478 kfree(mem);
479 }
480 mutex_unlock(&list_mutex);
481}
482
483
484#ifdef CONFIG_PROC_FS
485
486
487
488#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
489static struct proc_dir_entry *snd_mem_proc;
490
491static int snd_mem_proc_read(struct seq_file *seq, void *offset)
492{
493 long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
494 struct snd_mem_list *mem;
495 int devno;
496 static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };
497
498 mutex_lock(&list_mutex);
499 seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
500 pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
501 devno = 0;
502 list_for_each_entry(mem, &mem_list_head, list) {
503 devno++;
504 seq_printf(seq, "buffer %d : ID %08x : type %s\n",
505 devno, mem->id, types[mem->buffer.dev.type]);
506 seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
507 (unsigned long)mem->buffer.addr,
508 (int)mem->buffer.bytes);
509 }
510 mutex_unlock(&list_mutex);
511 return 0;
512}
513
514static int snd_mem_proc_open(struct inode *inode, struct file *file)
515{
516 return single_open(file, snd_mem_proc_read, NULL);
517}
518
519
520#ifdef CONFIG_PCI
521#define gettoken(bufp) strsep(bufp, " \t\n")
522
523static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
524 size_t count, loff_t * ppos)
525{
526 char buf[128];
527 char *token, *p;
528
529 if (count > sizeof(buf) - 1)
530 return -EINVAL;
531 if (copy_from_user(buf, buffer, count))
532 return -EFAULT;
533 buf[count] = '\0';
534
535 p = buf;
536 token = gettoken(&p);
537 if (! token || *token == '#')
538 return count;
539 if (strcmp(token, "add") == 0) {
540 char *endp;
541 int vendor, device, size, buffers;
542 long mask;
543 int i, alloced;
544 struct pci_dev *pci;
545
546 if ((token = gettoken(&p)) == NULL ||
547 (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
548 (token = gettoken(&p)) == NULL ||
549 (device = simple_strtol(token, NULL, 0)) <= 0 ||
550 (token = gettoken(&p)) == NULL ||
551 (mask = simple_strtol(token, NULL, 0)) < 0 ||
552 (token = gettoken(&p)) == NULL ||
553 (size = memparse(token, &endp)) < 64*1024 ||
554 size > 16*1024*1024 ||
555 (token = gettoken(&p)) == NULL ||
556 (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
557 buffers > 4) {
558 printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
559 return count;
560 }
561 vendor &= 0xffff;
562 device &= 0xffff;
563
564 alloced = 0;
565 pci = NULL;
566 while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
567 if (mask > 0 && mask < 0xffffffff) {
568 if (pci_set_dma_mask(pci, mask) < 0 ||
569 pci_set_consistent_dma_mask(pci, mask) < 0) {
570 printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
571 return count;
572 }
573 }
574 for (i = 0; i < buffers; i++) {
575 struct snd_dma_buffer dmab;
576 memset(&dmab, 0, sizeof(dmab));
577 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
578 size, &dmab) < 0) {
579 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
580 pci_dev_put(pci);
581 return count;
582 }
583 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
584 }
585 alloced++;
586 }
587 if (! alloced) {
588 for (i = 0; i < buffers; i++) {
589 struct snd_dma_buffer dmab;
590 memset(&dmab, 0, sizeof(dmab));
591
592
593
594 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
595 size, &dmab) < 0) {
596 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
597 break;
598 }
599 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
600 }
601 }
602 } else if (strcmp(token, "erase") == 0)
603
604 free_all_reserved_pages();
605 else
606 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
607 return count;
608}
609#endif
610
611static const struct file_operations snd_mem_proc_fops = {
612 .owner = THIS_MODULE,
613 .open = snd_mem_proc_open,
614 .read = seq_read,
615#ifdef CONFIG_PCI
616 .write = snd_mem_proc_write,
617#endif
618 .llseek = seq_lseek,
619 .release = single_release,
620};
621
622#endif
623
624
625
626
627
628static int __init snd_mem_init(void)
629{
630#ifdef CONFIG_PROC_FS
631 snd_mem_proc = create_proc_entry(SND_MEM_PROC_FILE, 0644, NULL);
632 if (snd_mem_proc)
633 snd_mem_proc->proc_fops = &snd_mem_proc_fops;
634#endif
635 return 0;
636}
637
638static void __exit snd_mem_exit(void)
639{
640 remove_proc_entry(SND_MEM_PROC_FILE, NULL);
641 free_all_reserved_pages();
642 if (snd_allocated_pages > 0)
643 printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages);
644}
645
646
647module_init(snd_mem_init)
648module_exit(snd_mem_exit)
649
650
651
652
653
654EXPORT_SYMBOL(snd_dma_alloc_pages);
655EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
656EXPORT_SYMBOL(snd_dma_free_pages);
657
658EXPORT_SYMBOL(snd_dma_get_reserved_buf);
659EXPORT_SYMBOL(snd_dma_reserve_buf);
660
661EXPORT_SYMBOL(snd_malloc_pages);
662EXPORT_SYMBOL(snd_free_pages);
663