Root/sound/core/memalloc.c

1/*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Takashi Iwai <tiwai@suse.de>
4 *
5 * Generic memory allocators
6 *
7 *
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.
12 *
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.
17 *
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
21 *
22 */
23
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
37
38MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
39MODULE_DESCRIPTION("Memory allocator for ALSA system.");
40MODULE_LICENSE("GPL");
41
42
43/*
44 */
45
46static DEFINE_MUTEX(list_mutex);
47static LIST_HEAD(mem_list_head);
48
49/* buffer preservation list */
50struct snd_mem_list {
51    struct snd_dma_buffer buffer;
52    unsigned int id;
53    struct list_head list;
54};
55
56/* id for pre-allocated buffers */
57#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
58
59/*
60 *
61 * Generic memory allocators
62 *
63 */
64
65static long snd_allocated_pages; /* holding the number of allocated pages */
66
67static inline void inc_snd_pages(int order)
68{
69    snd_allocated_pages += 1 << order;
70}
71
72static inline void dec_snd_pages(int order)
73{
74    snd_allocated_pages -= 1 << order;
75}
76
77/**
78 * snd_malloc_pages - allocate pages with the given size
79 * @size: the size to allocate in bytes
80 * @gfp_flags: the allocation conditions, GFP_XXX
81 *
82 * Allocates the physically contiguous pages with the given size.
83 *
84 * Returns the pointer of the buffer, or NULL if no enoguh memory.
85 */
86void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
87{
88    int pg;
89    void *res;
90
91    if (WARN_ON(!size))
92        return NULL;
93    if (WARN_ON(!gfp_flags))
94        return NULL;
95    gfp_flags |= __GFP_COMP; /* compound page lets parts be mapped */
96    pg = get_order(size);
97    if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
98        inc_snd_pages(pg);
99    return res;
100}
101
102/**
103 * snd_free_pages - release the pages
104 * @ptr: the buffer pointer to release
105 * @size: the allocated buffer size
106 *
107 * Releases the buffer allocated via snd_malloc_pages().
108 */
109void snd_free_pages(void *ptr, size_t size)
110{
111    int pg;
112
113    if (ptr == NULL)
114        return;
115    pg = get_order(size);
116    dec_snd_pages(pg);
117    free_pages((unsigned long) ptr, pg);
118}
119
120/*
121 *
122 * Bus-specific memory allocators
123 *
124 */
125
126#ifdef CONFIG_HAS_DMA
127/* allocate the coherent DMA pages */
128static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
129{
130    int pg;
131    void *res;
132    gfp_t gfp_flags;
133
134    if (WARN_ON(!dma))
135        return NULL;
136    pg = get_order(size);
137    gfp_flags = GFP_KERNEL
138        | __GFP_COMP /* compound page lets parts be mapped */
139        | __GFP_NORETRY /* don't trigger OOM-killer */
140        | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
141    res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
142    if (res != NULL)
143        inc_snd_pages(pg);
144
145    return res;
146}
147
148/* free the coherent DMA pages */
149static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
150                   dma_addr_t dma)
151{
152    int pg;
153
154    if (ptr == NULL)
155        return;
156    pg = get_order(size);
157    dec_snd_pages(pg);
158    dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
159}
160#endif /* CONFIG_HAS_DMA */
161
162/*
163 *
164 * ALSA generic memory management
165 *
166 */
167
168
169/**
170 * snd_dma_alloc_pages - allocate the buffer area according to the given type
171 * @type: the DMA buffer type
172 * @device: the device pointer
173 * @size: the buffer size to allocate
174 * @dmab: buffer allocation record to store the allocated data
175 *
176 * Calls the memory-allocator function for the corresponding
177 * buffer type.
178 *
179 * Returns zero if the buffer with the given size is allocated successfuly,
180 * other a negative value at error.
181 */
182int snd_dma_alloc_pages(int type, struct device *device, size_t size,
183            struct snd_dma_buffer *dmab)
184{
185    if (WARN_ON(!size))
186        return -ENXIO;
187    if (WARN_ON(!dmab))
188        return -ENXIO;
189
190    dmab->dev.type = type;
191    dmab->dev.dev = device;
192    dmab->bytes = 0;
193    switch (type) {
194    case SNDRV_DMA_TYPE_CONTINUOUS:
195        dmab->area = snd_malloc_pages(size,
196                    (__force gfp_t)(unsigned long)device);
197        dmab->addr = 0;
198        break;
199#ifdef CONFIG_HAS_DMA
200    case SNDRV_DMA_TYPE_DEV:
201        dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
202        break;
203#endif
204#ifdef CONFIG_SND_DMA_SGBUF
205    case SNDRV_DMA_TYPE_DEV_SG:
206        snd_malloc_sgbuf_pages(device, size, dmab, NULL);
207        break;
208#endif
209    default:
210        printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
211        dmab->area = NULL;
212        dmab->addr = 0;
213        return -ENXIO;
214    }
215    if (! dmab->area)
216        return -ENOMEM;
217    dmab->bytes = size;
218    return 0;
219}
220
221/**
222 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
223 * @type: the DMA buffer type
224 * @device: the device pointer
225 * @size: the buffer size to allocate
226 * @dmab: buffer allocation record to store the allocated data
227 *
228 * Calls the memory-allocator function for the corresponding
229 * buffer type. When no space is left, this function reduces the size and
230 * tries to allocate again. The size actually allocated is stored in
231 * res_size argument.
232 *
233 * Returns zero if the buffer with the given size is allocated successfuly,
234 * other a negative value at error.
235 */
236int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
237                 struct snd_dma_buffer *dmab)
238{
239    int err;
240
241    while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
242        size_t aligned_size;
243        if (err != -ENOMEM)
244            return err;
245        if (size <= PAGE_SIZE)
246            return -ENOMEM;
247        aligned_size = PAGE_SIZE << get_order(size);
248        if (size != aligned_size)
249            size = aligned_size;
250        else
251            size >>= 1;
252    }
253    if (! dmab->area)
254        return -ENOMEM;
255    return 0;
256}
257
258
259/**
260 * snd_dma_free_pages - release the allocated buffer
261 * @dmab: the buffer allocation record to release
262 *
263 * Releases the allocated buffer via snd_dma_alloc_pages().
264 */
265void snd_dma_free_pages(struct snd_dma_buffer *dmab)
266{
267    switch (dmab->dev.type) {
268    case SNDRV_DMA_TYPE_CONTINUOUS:
269        snd_free_pages(dmab->area, dmab->bytes);
270        break;
271#ifdef CONFIG_HAS_DMA
272    case SNDRV_DMA_TYPE_DEV:
273        snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
274        break;
275#endif
276#ifdef CONFIG_SND_DMA_SGBUF
277    case SNDRV_DMA_TYPE_DEV_SG:
278        snd_free_sgbuf_pages(dmab);
279        break;
280#endif
281    default:
282        printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
283    }
284}
285
286
287/**
288 * snd_dma_get_reserved - get the reserved buffer for the given device
289 * @dmab: the buffer allocation record to store
290 * @id: the buffer id
291 *
292 * Looks for the reserved-buffer list and re-uses if the same buffer
293 * is found in the list. When the buffer is found, it's removed from the free list.
294 *
295 * Returns the size of buffer if the buffer is found, or zero if not found.
296 */
297size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
298{
299    struct snd_mem_list *mem;
300
301    if (WARN_ON(!dmab))
302        return 0;
303
304    mutex_lock(&list_mutex);
305    list_for_each_entry(mem, &mem_list_head, list) {
306        if (mem->id == id &&
307            (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
308             ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
309            struct device *dev = dmab->dev.dev;
310            list_del(&mem->list);
311            *dmab = mem->buffer;
312            if (dmab->dev.dev == NULL)
313                dmab->dev.dev = dev;
314            kfree(mem);
315            mutex_unlock(&list_mutex);
316            return dmab->bytes;
317        }
318    }
319    mutex_unlock(&list_mutex);
320    return 0;
321}
322
323/**
324 * snd_dma_reserve_buf - reserve the buffer
325 * @dmab: the buffer to reserve
326 * @id: the buffer id
327 *
328 * Reserves the given buffer as a reserved buffer.
329 *
330 * Returns zero if successful, or a negative code at error.
331 */
332int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
333{
334    struct snd_mem_list *mem;
335
336    if (WARN_ON(!dmab))
337        return -EINVAL;
338    mem = kmalloc(sizeof(*mem), GFP_KERNEL);
339    if (! mem)
340        return -ENOMEM;
341    mutex_lock(&list_mutex);
342    mem->buffer = *dmab;
343    mem->id = id;
344    list_add_tail(&mem->list, &mem_list_head);
345    mutex_unlock(&list_mutex);
346    return 0;
347}
348
349/*
350 * purge all reserved buffers
351 */
352static void free_all_reserved_pages(void)
353{
354    struct list_head *p;
355    struct snd_mem_list *mem;
356
357    mutex_lock(&list_mutex);
358    while (! list_empty(&mem_list_head)) {
359        p = mem_list_head.next;
360        mem = list_entry(p, struct snd_mem_list, list);
361        list_del(p);
362        snd_dma_free_pages(&mem->buffer);
363        kfree(mem);
364    }
365    mutex_unlock(&list_mutex);
366}
367
368
369#ifdef CONFIG_PROC_FS
370/*
371 * proc file interface
372 */
373#define SND_MEM_PROC_FILE "driver/snd-page-alloc"
374static struct proc_dir_entry *snd_mem_proc;
375
376static int snd_mem_proc_read(struct seq_file *seq, void *offset)
377{
378    long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
379    struct snd_mem_list *mem;
380    int devno;
381    static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
382
383    mutex_lock(&list_mutex);
384    seq_printf(seq, "pages : %li bytes (%li pages per %likB)\n",
385           pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
386    devno = 0;
387    list_for_each_entry(mem, &mem_list_head, list) {
388        devno++;
389        seq_printf(seq, "buffer %d : ID %08x : type %s\n",
390               devno, mem->id, types[mem->buffer.dev.type]);
391        seq_printf(seq, " addr = 0x%lx, size = %d bytes\n",
392               (unsigned long)mem->buffer.addr,
393               (int)mem->buffer.bytes);
394    }
395    mutex_unlock(&list_mutex);
396    return 0;
397}
398
399static int snd_mem_proc_open(struct inode *inode, struct file *file)
400{
401    return single_open(file, snd_mem_proc_read, NULL);
402}
403
404/* FIXME: for pci only - other bus? */
405#ifdef CONFIG_PCI
406#define gettoken(bufp) strsep(bufp, " \t\n")
407
408static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
409                  size_t count, loff_t * ppos)
410{
411    char buf[128];
412    char *token, *p;
413
414    if (count > sizeof(buf) - 1)
415        return -EINVAL;
416    if (copy_from_user(buf, buffer, count))
417        return -EFAULT;
418    buf[count] = '\0';
419
420    p = buf;
421    token = gettoken(&p);
422    if (! token || *token == '#')
423        return count;
424    if (strcmp(token, "add") == 0) {
425        char *endp;
426        int vendor, device, size, buffers;
427        long mask;
428        int i, alloced;
429        struct pci_dev *pci;
430
431        if ((token = gettoken(&p)) == NULL ||
432            (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
433            (token = gettoken(&p)) == NULL ||
434            (device = simple_strtol(token, NULL, 0)) <= 0 ||
435            (token = gettoken(&p)) == NULL ||
436            (mask = simple_strtol(token, NULL, 0)) < 0 ||
437            (token = gettoken(&p)) == NULL ||
438            (size = memparse(token, &endp)) < 64*1024 ||
439            size > 16*1024*1024 /* too big */ ||
440            (token = gettoken(&p)) == NULL ||
441            (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
442            buffers > 4) {
443            printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
444            return count;
445        }
446        vendor &= 0xffff;
447        device &= 0xffff;
448
449        alloced = 0;
450        pci = NULL;
451        while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
452            if (mask > 0 && mask < 0xffffffff) {
453                if (pci_set_dma_mask(pci, mask) < 0 ||
454                    pci_set_consistent_dma_mask(pci, mask) < 0) {
455                    printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
456                    pci_dev_put(pci);
457                    return count;
458                }
459            }
460            for (i = 0; i < buffers; i++) {
461                struct snd_dma_buffer dmab;
462                memset(&dmab, 0, sizeof(dmab));
463                if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
464                            size, &dmab) < 0) {
465                    printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
466                    pci_dev_put(pci);
467                    return count;
468                }
469                snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
470            }
471            alloced++;
472        }
473        if (! alloced) {
474            for (i = 0; i < buffers; i++) {
475                struct snd_dma_buffer dmab;
476                memset(&dmab, 0, sizeof(dmab));
477                /* FIXME: We can allocate only in ZONE_DMA
478                 * without a device pointer!
479                 */
480                if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
481                            size, &dmab) < 0) {
482                    printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
483                    break;
484                }
485                snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
486            }
487        }
488    } else if (strcmp(token, "erase") == 0)
489        /* FIXME: need for releasing each buffer chunk? */
490        free_all_reserved_pages();
491    else
492        printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
493    return count;
494}
495#endif /* CONFIG_PCI */
496
497static const struct file_operations snd_mem_proc_fops = {
498    .owner = THIS_MODULE,
499    .open = snd_mem_proc_open,
500    .read = seq_read,
501#ifdef CONFIG_PCI
502    .write = snd_mem_proc_write,
503#endif
504    .llseek = seq_lseek,
505    .release = single_release,
506};
507
508#endif /* CONFIG_PROC_FS */
509
510/*
511 * module entry
512 */
513
514static int __init snd_mem_init(void)
515{
516#ifdef CONFIG_PROC_FS
517    snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
518                   &snd_mem_proc_fops);
519#endif
520    return 0;
521}
522
523static void __exit snd_mem_exit(void)
524{
525    remove_proc_entry(SND_MEM_PROC_FILE, NULL);
526    free_all_reserved_pages();
527    if (snd_allocated_pages > 0)
528        printk(KERN_ERR "snd-malloc: Memory leak? pages not freed = %li\n", snd_allocated_pages);
529}
530
531
532module_init(snd_mem_init)
533module_exit(snd_mem_exit)
534
535
536/*
537 * exports
538 */
539EXPORT_SYMBOL(snd_dma_alloc_pages);
540EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
541EXPORT_SYMBOL(snd_dma_free_pages);
542
543EXPORT_SYMBOL(snd_dma_get_reserved_buf);
544EXPORT_SYMBOL(snd_dma_reserve_buf);
545
546EXPORT_SYMBOL(snd_malloc_pages);
547EXPORT_SYMBOL(snd_free_pages);
548

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