2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
5 * Generic memory allocators
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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>
30 #include <linux/seq_file.h>
31 #include <asm/uaccess.h>
32 #include <linux/dma-mapping.h>
33 #include <linux/genalloc.h>
34 #include <linux/moduleparam.h>
35 #include <linux/mutex.h>
36 #include <sound/memalloc.h>
39 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
40 MODULE_DESCRIPTION("Memory allocator for ALSA system.");
41 MODULE_LICENSE("GPL");
47 static DEFINE_MUTEX(list_mutex);
48 static LIST_HEAD(mem_list_head);
50 /* buffer preservation list */
52 struct snd_dma_buffer buffer;
54 struct list_head list;
57 /* id for pre-allocated buffers */
58 #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
62 * Generic memory allocators
66 static long snd_allocated_pages; /* holding the number of allocated pages */
68 static inline void inc_snd_pages(int order)
70 snd_allocated_pages += 1 << order;
73 static inline void dec_snd_pages(int order)
75 snd_allocated_pages -= 1 << order;
79 * snd_malloc_pages - allocate pages with the given size
80 * @size: the size to allocate in bytes
81 * @gfp_flags: the allocation conditions, GFP_XXX
83 * Allocates the physically contiguous pages with the given size.
85 * Return: The pointer of the buffer, or %NULL if no enough memory.
87 void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
94 if (WARN_ON(!gfp_flags))
96 gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
98 if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
104 * snd_free_pages - release the pages
105 * @ptr: the buffer pointer to release
106 * @size: the allocated buffer size
108 * Releases the buffer allocated via snd_malloc_pages().
110 void snd_free_pages(void *ptr, size_t size)
116 pg = get_order(size);
118 free_pages((unsigned long) ptr, pg);
123 * Bus-specific memory allocators
127 #ifdef CONFIG_HAS_DMA
128 /* allocate the coherent DMA pages */
129 static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
137 pg = get_order(size);
138 gfp_flags = GFP_KERNEL
139 | __GFP_COMP /* compound page lets parts be mapped */
140 | __GFP_NORETRY /* don't trigger OOM-killer */
141 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
142 res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
149 /* free the coherent DMA pages */
150 static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
157 pg = get_order(size);
159 dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
163 * snd_malloc_dev_iram - allocate memory from on-chip internal ram
164 * @dmab: buffer allocation record to store the allocated data
165 * @size: number of bytes to allocate from the iram
167 * This function requires iram phandle provided via of_node
169 void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
171 struct device *dev = dmab->dev.dev;
172 struct gen_pool *pool = NULL;
175 pool = of_get_named_gen_pool(dev->of_node, "iram", 0);
180 /* Assign the pool into private_data field */
181 dmab->private_data = pool;
183 dmab->area = (void *)gen_pool_alloc(pool, size);
187 dmab->addr = gen_pool_virt_to_phys(pool, (unsigned long)dmab->area);
191 * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
192 * @dmab: buffer allocation record to store the allocated data
194 void snd_free_dev_iram(struct snd_dma_buffer *dmab)
196 struct gen_pool *pool = dmab->private_data;
198 if (pool && dmab->area)
199 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
201 #endif /* CONFIG_HAS_DMA */
205 * ALSA generic memory management
211 * snd_dma_alloc_pages - allocate the buffer area according to the given type
212 * @type: the DMA buffer type
213 * @device: the device pointer
214 * @size: the buffer size to allocate
215 * @dmab: buffer allocation record to store the allocated data
217 * Calls the memory-allocator function for the corresponding
220 * Return: Zero if the buffer with the given size is allocated successfully,
221 * otherwise a negative value on error.
223 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
224 struct snd_dma_buffer *dmab)
231 dmab->dev.type = type;
232 dmab->dev.dev = device;
235 case SNDRV_DMA_TYPE_CONTINUOUS:
236 dmab->area = snd_malloc_pages(size,
237 (__force gfp_t)(unsigned long)device);
240 #ifdef CONFIG_HAS_DMA
241 #ifdef CONFIG_GENERIC_ALLOCATOR
242 case SNDRV_DMA_TYPE_DEV_IRAM:
243 snd_malloc_dev_iram(dmab, size);
246 /* Internal memory might have limited size and no enough space,
247 * so if we fail to malloc, try to fetch memory traditionally.
249 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
250 #endif /* CONFIG_GENERIC_ALLOCATOR */
251 case SNDRV_DMA_TYPE_DEV:
252 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
255 #ifdef CONFIG_SND_DMA_SGBUF
256 case SNDRV_DMA_TYPE_DEV_SG:
257 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
261 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
273 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
274 * @type: the DMA buffer type
275 * @device: the device pointer
276 * @size: the buffer size to allocate
277 * @dmab: buffer allocation record to store the allocated data
279 * Calls the memory-allocator function for the corresponding
280 * buffer type. When no space is left, this function reduces the size and
281 * tries to allocate again. The size actually allocated is stored in
284 * Return: Zero if the buffer with the given size is allocated successfully,
285 * otherwise a negative value on error.
287 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
288 struct snd_dma_buffer *dmab)
292 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
296 if (size <= PAGE_SIZE)
298 aligned_size = PAGE_SIZE << get_order(size);
299 if (size != aligned_size)
311 * snd_dma_free_pages - release the allocated buffer
312 * @dmab: the buffer allocation record to release
314 * Releases the allocated buffer via snd_dma_alloc_pages().
316 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
318 switch (dmab->dev.type) {
319 case SNDRV_DMA_TYPE_CONTINUOUS:
320 snd_free_pages(dmab->area, dmab->bytes);
322 #ifdef CONFIG_HAS_DMA
323 #ifdef CONFIG_GENERIC_ALLOCATOR
324 case SNDRV_DMA_TYPE_DEV_IRAM:
325 snd_free_dev_iram(dmab);
327 #endif /* CONFIG_GENERIC_ALLOCATOR */
328 case SNDRV_DMA_TYPE_DEV:
329 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
332 #ifdef CONFIG_SND_DMA_SGBUF
333 case SNDRV_DMA_TYPE_DEV_SG:
334 snd_free_sgbuf_pages(dmab);
338 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
344 * snd_dma_get_reserved - get the reserved buffer for the given device
345 * @dmab: the buffer allocation record to store
348 * Looks for the reserved-buffer list and re-uses if the same buffer
349 * is found in the list. When the buffer is found, it's removed from the free list.
351 * Return: The size of buffer if the buffer is found, or zero if not found.
353 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
355 struct snd_mem_list *mem;
360 mutex_lock(&list_mutex);
361 list_for_each_entry(mem, &mem_list_head, list) {
363 (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
364 ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
365 struct device *dev = dmab->dev.dev;
366 list_del(&mem->list);
368 if (dmab->dev.dev == NULL)
371 mutex_unlock(&list_mutex);
375 mutex_unlock(&list_mutex);
380 * snd_dma_reserve_buf - reserve the buffer
381 * @dmab: the buffer to reserve
384 * Reserves the given buffer as a reserved buffer.
386 * Return: Zero if successful, or a negative code on error.
388 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
390 struct snd_mem_list *mem;
394 mem = kmalloc(sizeof(*mem), GFP_KERNEL);
397 mutex_lock(&list_mutex);
400 list_add_tail(&mem->list, &mem_list_head);
401 mutex_unlock(&list_mutex);
406 * purge all reserved buffers
408 static void free_all_reserved_pages(void)
411 struct snd_mem_list *mem;
413 mutex_lock(&list_mutex);
414 while (! list_empty(&mem_list_head)) {
415 p = mem_list_head.next;
416 mem = list_entry(p, struct snd_mem_list, list);
418 snd_dma_free_pages(&mem->buffer);
421 mutex_unlock(&list_mutex);
425 #ifdef CONFIG_PROC_FS
427 * proc file interface
429 #define SND_MEM_PROC_FILE "driver/snd-page-alloc"
430 static struct proc_dir_entry *snd_mem_proc;
432 static int snd_mem_proc_read(struct seq_file *seq, void *offset)
434 long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
435 struct snd_mem_list *mem;
437 static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
439 mutex_lock(&list_mutex);
440 seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
441 pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
443 list_for_each_entry(mem, &mem_list_head, list) {
445 seq_printf(seq, "buffer %d : ID %08x : type %s\n",
446 devno, mem->id, types[mem->buffer.dev.type]);
447 seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
448 (unsigned long)mem->buffer.addr,
449 (int)mem->buffer.bytes);
451 mutex_unlock(&list_mutex);
455 static int snd_mem_proc_open(struct inode *inode, struct file *file)
457 return single_open(file, snd_mem_proc_read, NULL);
460 /* FIXME: for pci only - other bus? */
462 #define gettoken(bufp) strsep(bufp, " \t\n")
464 static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
465 size_t count, loff_t * ppos)
470 if (count > sizeof(buf) - 1)
472 if (copy_from_user(buf, buffer, count))
477 token = gettoken(&p);
478 if (! token || *token == '#')
480 if (strcmp(token, "add") == 0) {
482 int vendor, device, size, buffers;
487 if ((token = gettoken(&p)) == NULL ||
488 (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
489 (token = gettoken(&p)) == NULL ||
490 (device = simple_strtol(token, NULL, 0)) <= 0 ||
491 (token = gettoken(&p)) == NULL ||
492 (mask = simple_strtol(token, NULL, 0)) < 0 ||
493 (token = gettoken(&p)) == NULL ||
494 (size = memparse(token, &endp)) < 64*1024 ||
495 size > 16*1024*1024 /* too big */ ||
496 (token = gettoken(&p)) == NULL ||
497 (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
499 printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
507 while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
508 if (mask > 0 && mask < 0xffffffff) {
509 if (pci_set_dma_mask(pci, mask) < 0 ||
510 pci_set_consistent_dma_mask(pci, mask) < 0) {
511 printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
516 for (i = 0; i < buffers; i++) {
517 struct snd_dma_buffer dmab;
518 memset(&dmab, 0, sizeof(dmab));
519 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
521 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
525 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
530 for (i = 0; i < buffers; i++) {
531 struct snd_dma_buffer dmab;
532 memset(&dmab, 0, sizeof(dmab));
533 /* FIXME: We can allocate only in ZONE_DMA
534 * without a device pointer!
536 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
538 printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
541 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
544 } else if (strcmp(token, "erase") == 0)
545 /* FIXME: need for releasing each buffer chunk? */
546 free_all_reserved_pages();
548 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
551 #endif /* CONFIG_PCI */
553 static const struct file_operations snd_mem_proc_fops = {
554 .owner = THIS_MODULE,
555 .open = snd_mem_proc_open,
558 .write = snd_mem_proc_write,
561 .release = single_release,
564 #endif /* CONFIG_PROC_FS */
570 static int __init snd_mem_init(void)
572 #ifdef CONFIG_PROC_FS
573 snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
579 static void __exit snd_mem_exit(void)
581 remove_proc_entry(SND_MEM_PROC_FILE, NULL);
582 free_all_reserved_pages();
583 if (snd_allocated_pages > 0)
584 printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages);
588 module_init(snd_mem_init)
589 module_exit(snd_mem_exit)
595 EXPORT_SYMBOL(snd_dma_alloc_pages);
596 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
597 EXPORT_SYMBOL(snd_dma_free_pages);
599 EXPORT_SYMBOL(snd_dma_get_reserved_buf);
600 EXPORT_SYMBOL(snd_dma_reserve_buf);
602 EXPORT_SYMBOL(snd_malloc_pages);
603 EXPORT_SYMBOL(snd_free_pages);