Loading...
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);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Takashi Iwai <tiwai@suse.de>
5 *
6 * Generic memory allocators
7 */
8
9#include <linux/slab.h>
10#include <linux/mm.h>
11#include <linux/dma-mapping.h>
12#include <linux/dma-map-ops.h>
13#include <linux/genalloc.h>
14#include <linux/highmem.h>
15#include <linux/vmalloc.h>
16#ifdef CONFIG_X86
17#include <asm/set_memory.h>
18#endif
19#include <sound/memalloc.h>
20#include "memalloc_local.h"
21
22#define DEFAULT_GFP \
23 (GFP_KERNEL | \
24 __GFP_RETRY_MAYFAIL | /* don't trigger OOM-killer */ \
25 __GFP_NOWARN) /* no stack trace print - this call is non-critical */
26
27static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab);
28
29#ifdef CONFIG_SND_DMA_SGBUF
30static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size);
31#endif
32
33static void *__snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size)
34{
35 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
36
37 if (WARN_ON_ONCE(!ops || !ops->alloc))
38 return NULL;
39 return ops->alloc(dmab, size);
40}
41
42/**
43 * snd_dma_alloc_dir_pages - allocate the buffer area according to the given
44 * type and direction
45 * @type: the DMA buffer type
46 * @device: the device pointer
47 * @dir: DMA direction
48 * @size: the buffer size to allocate
49 * @dmab: buffer allocation record to store the allocated data
50 *
51 * Calls the memory-allocator function for the corresponding
52 * buffer type.
53 *
54 * Return: Zero if the buffer with the given size is allocated successfully,
55 * otherwise a negative value on error.
56 */
57int snd_dma_alloc_dir_pages(int type, struct device *device,
58 enum dma_data_direction dir, size_t size,
59 struct snd_dma_buffer *dmab)
60{
61 if (WARN_ON(!size))
62 return -ENXIO;
63 if (WARN_ON(!dmab))
64 return -ENXIO;
65
66 size = PAGE_ALIGN(size);
67 dmab->dev.type = type;
68 dmab->dev.dev = device;
69 dmab->dev.dir = dir;
70 dmab->bytes = 0;
71 dmab->addr = 0;
72 dmab->private_data = NULL;
73 dmab->area = __snd_dma_alloc_pages(dmab, size);
74 if (!dmab->area)
75 return -ENOMEM;
76 dmab->bytes = size;
77 return 0;
78}
79EXPORT_SYMBOL(snd_dma_alloc_dir_pages);
80
81/**
82 * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
83 * @type: the DMA buffer type
84 * @device: the device pointer
85 * @size: the buffer size to allocate
86 * @dmab: buffer allocation record to store the allocated data
87 *
88 * Calls the memory-allocator function for the corresponding
89 * buffer type. When no space is left, this function reduces the size and
90 * tries to allocate again. The size actually allocated is stored in
91 * res_size argument.
92 *
93 * Return: Zero if the buffer with the given size is allocated successfully,
94 * otherwise a negative value on error.
95 */
96int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
97 struct snd_dma_buffer *dmab)
98{
99 int err;
100
101 while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
102 if (err != -ENOMEM)
103 return err;
104 if (size <= PAGE_SIZE)
105 return -ENOMEM;
106 size >>= 1;
107 size = PAGE_SIZE << get_order(size);
108 }
109 if (! dmab->area)
110 return -ENOMEM;
111 return 0;
112}
113EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
114
115/**
116 * snd_dma_free_pages - release the allocated buffer
117 * @dmab: the buffer allocation record to release
118 *
119 * Releases the allocated buffer via snd_dma_alloc_pages().
120 */
121void snd_dma_free_pages(struct snd_dma_buffer *dmab)
122{
123 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
124
125 if (ops && ops->free)
126 ops->free(dmab);
127}
128EXPORT_SYMBOL(snd_dma_free_pages);
129
130/* called by devres */
131static void __snd_release_pages(struct device *dev, void *res)
132{
133 snd_dma_free_pages(res);
134}
135
136/**
137 * snd_devm_alloc_dir_pages - allocate the buffer and manage with devres
138 * @dev: the device pointer
139 * @type: the DMA buffer type
140 * @dir: DMA direction
141 * @size: the buffer size to allocate
142 *
143 * Allocate buffer pages depending on the given type and manage using devres.
144 * The pages will be released automatically at the device removal.
145 *
146 * Unlike snd_dma_alloc_pages(), this function requires the real device pointer,
147 * hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or
148 * SNDRV_DMA_TYPE_VMALLOC type.
149 *
150 * Return: the snd_dma_buffer object at success, or NULL if failed
151 */
152struct snd_dma_buffer *
153snd_devm_alloc_dir_pages(struct device *dev, int type,
154 enum dma_data_direction dir, size_t size)
155{
156 struct snd_dma_buffer *dmab;
157 int err;
158
159 if (WARN_ON(type == SNDRV_DMA_TYPE_CONTINUOUS ||
160 type == SNDRV_DMA_TYPE_VMALLOC))
161 return NULL;
162
163 dmab = devres_alloc(__snd_release_pages, sizeof(*dmab), GFP_KERNEL);
164 if (!dmab)
165 return NULL;
166
167 err = snd_dma_alloc_dir_pages(type, dev, dir, size, dmab);
168 if (err < 0) {
169 devres_free(dmab);
170 return NULL;
171 }
172
173 devres_add(dev, dmab);
174 return dmab;
175}
176EXPORT_SYMBOL_GPL(snd_devm_alloc_dir_pages);
177
178/**
179 * snd_dma_buffer_mmap - perform mmap of the given DMA buffer
180 * @dmab: buffer allocation information
181 * @area: VM area information
182 *
183 * Return: zero if successful, or a negative error code
184 */
185int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
186 struct vm_area_struct *area)
187{
188 const struct snd_malloc_ops *ops;
189
190 if (!dmab)
191 return -ENOENT;
192 ops = snd_dma_get_ops(dmab);
193 if (ops && ops->mmap)
194 return ops->mmap(dmab, area);
195 else
196 return -ENOENT;
197}
198EXPORT_SYMBOL(snd_dma_buffer_mmap);
199
200#ifdef CONFIG_HAS_DMA
201/**
202 * snd_dma_buffer_sync - sync DMA buffer between CPU and device
203 * @dmab: buffer allocation information
204 * @mode: sync mode
205 */
206void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
207 enum snd_dma_sync_mode mode)
208{
209 const struct snd_malloc_ops *ops;
210
211 if (!dmab || !dmab->dev.need_sync)
212 return;
213 ops = snd_dma_get_ops(dmab);
214 if (ops && ops->sync)
215 ops->sync(dmab, mode);
216}
217EXPORT_SYMBOL_GPL(snd_dma_buffer_sync);
218#endif /* CONFIG_HAS_DMA */
219
220/**
221 * snd_sgbuf_get_addr - return the physical address at the corresponding offset
222 * @dmab: buffer allocation information
223 * @offset: offset in the ring buffer
224 *
225 * Return: the physical address
226 */
227dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset)
228{
229 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
230
231 if (ops && ops->get_addr)
232 return ops->get_addr(dmab, offset);
233 else
234 return dmab->addr + offset;
235}
236EXPORT_SYMBOL(snd_sgbuf_get_addr);
237
238/**
239 * snd_sgbuf_get_page - return the physical page at the corresponding offset
240 * @dmab: buffer allocation information
241 * @offset: offset in the ring buffer
242 *
243 * Return: the page pointer
244 */
245struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset)
246{
247 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
248
249 if (ops && ops->get_page)
250 return ops->get_page(dmab, offset);
251 else
252 return virt_to_page(dmab->area + offset);
253}
254EXPORT_SYMBOL(snd_sgbuf_get_page);
255
256/**
257 * snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
258 * on sg-buffer
259 * @dmab: buffer allocation information
260 * @ofs: offset in the ring buffer
261 * @size: the requested size
262 *
263 * Return: the chunk size
264 */
265unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
266 unsigned int ofs, unsigned int size)
267{
268 const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
269
270 if (ops && ops->get_chunk_size)
271 return ops->get_chunk_size(dmab, ofs, size);
272 else
273 return size;
274}
275EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
276
277/*
278 * Continuous pages allocator
279 */
280static void *do_alloc_pages(struct device *dev, size_t size, dma_addr_t *addr,
281 bool wc)
282{
283 void *p;
284 gfp_t gfp = GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN;
285
286 again:
287 p = alloc_pages_exact(size, gfp);
288 if (!p)
289 return NULL;
290 *addr = page_to_phys(virt_to_page(p));
291 if (!dev)
292 return p;
293 if ((*addr + size - 1) & ~dev->coherent_dma_mask) {
294 if (IS_ENABLED(CONFIG_ZONE_DMA32) && !(gfp & GFP_DMA32)) {
295 gfp |= GFP_DMA32;
296 goto again;
297 }
298 if (IS_ENABLED(CONFIG_ZONE_DMA) && !(gfp & GFP_DMA)) {
299 gfp = (gfp & ~GFP_DMA32) | GFP_DMA;
300 goto again;
301 }
302 }
303#ifdef CONFIG_X86
304 if (wc)
305 set_memory_wc((unsigned long)(p), size >> PAGE_SHIFT);
306#endif
307 return p;
308}
309
310static void do_free_pages(void *p, size_t size, bool wc)
311{
312#ifdef CONFIG_X86
313 if (wc)
314 set_memory_wb((unsigned long)(p), size >> PAGE_SHIFT);
315#endif
316 free_pages_exact(p, size);
317}
318
319
320static void *snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size)
321{
322 return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, false);
323}
324
325static void snd_dma_continuous_free(struct snd_dma_buffer *dmab)
326{
327 do_free_pages(dmab->area, dmab->bytes, false);
328}
329
330static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
331 struct vm_area_struct *area)
332{
333 return remap_pfn_range(area, area->vm_start,
334 dmab->addr >> PAGE_SHIFT,
335 area->vm_end - area->vm_start,
336 area->vm_page_prot);
337}
338
339static const struct snd_malloc_ops snd_dma_continuous_ops = {
340 .alloc = snd_dma_continuous_alloc,
341 .free = snd_dma_continuous_free,
342 .mmap = snd_dma_continuous_mmap,
343};
344
345/*
346 * VMALLOC allocator
347 */
348static void *snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size)
349{
350 return vmalloc(size);
351}
352
353static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab)
354{
355 vfree(dmab->area);
356}
357
358static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab,
359 struct vm_area_struct *area)
360{
361 return remap_vmalloc_range(area, dmab->area, 0);
362}
363
364#define get_vmalloc_page_addr(dmab, offset) \
365 page_to_phys(vmalloc_to_page((dmab)->area + (offset)))
366
367static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab,
368 size_t offset)
369{
370 return get_vmalloc_page_addr(dmab, offset) + offset % PAGE_SIZE;
371}
372
373static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab,
374 size_t offset)
375{
376 return vmalloc_to_page(dmab->area + offset);
377}
378
379static unsigned int
380snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab,
381 unsigned int ofs, unsigned int size)
382{
383 unsigned int start, end;
384 unsigned long addr;
385
386 start = ALIGN_DOWN(ofs, PAGE_SIZE);
387 end = ofs + size - 1; /* the last byte address */
388 /* check page continuity */
389 addr = get_vmalloc_page_addr(dmab, start);
390 for (;;) {
391 start += PAGE_SIZE;
392 if (start > end)
393 break;
394 addr += PAGE_SIZE;
395 if (get_vmalloc_page_addr(dmab, start) != addr)
396 return start - ofs;
397 }
398 /* ok, all on continuous pages */
399 return size;
400}
401
402static const struct snd_malloc_ops snd_dma_vmalloc_ops = {
403 .alloc = snd_dma_vmalloc_alloc,
404 .free = snd_dma_vmalloc_free,
405 .mmap = snd_dma_vmalloc_mmap,
406 .get_addr = snd_dma_vmalloc_get_addr,
407 .get_page = snd_dma_vmalloc_get_page,
408 .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
409};
410
411#ifdef CONFIG_HAS_DMA
412/*
413 * IRAM allocator
414 */
415#ifdef CONFIG_GENERIC_ALLOCATOR
416static void *snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size)
417{
418 struct device *dev = dmab->dev.dev;
419 struct gen_pool *pool;
420 void *p;
421
422 if (dev->of_node) {
423 pool = of_gen_pool_get(dev->of_node, "iram", 0);
424 /* Assign the pool into private_data field */
425 dmab->private_data = pool;
426
427 p = gen_pool_dma_alloc_align(pool, size, &dmab->addr, PAGE_SIZE);
428 if (p)
429 return p;
430 }
431
432 /* Internal memory might have limited size and no enough space,
433 * so if we fail to malloc, try to fetch memory traditionally.
434 */
435 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
436 return __snd_dma_alloc_pages(dmab, size);
437}
438
439static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
440{
441 struct gen_pool *pool = dmab->private_data;
442
443 if (pool && dmab->area)
444 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
445}
446
447static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab,
448 struct vm_area_struct *area)
449{
450 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
451 return remap_pfn_range(area, area->vm_start,
452 dmab->addr >> PAGE_SHIFT,
453 area->vm_end - area->vm_start,
454 area->vm_page_prot);
455}
456
457static const struct snd_malloc_ops snd_dma_iram_ops = {
458 .alloc = snd_dma_iram_alloc,
459 .free = snd_dma_iram_free,
460 .mmap = snd_dma_iram_mmap,
461};
462#endif /* CONFIG_GENERIC_ALLOCATOR */
463
464/*
465 * Coherent device pages allocator
466 */
467static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
468{
469 return dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
470}
471
472static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
473{
474 dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
475}
476
477static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
478 struct vm_area_struct *area)
479{
480 return dma_mmap_coherent(dmab->dev.dev, area,
481 dmab->area, dmab->addr, dmab->bytes);
482}
483
484static const struct snd_malloc_ops snd_dma_dev_ops = {
485 .alloc = snd_dma_dev_alloc,
486 .free = snd_dma_dev_free,
487 .mmap = snd_dma_dev_mmap,
488};
489
490/*
491 * Write-combined pages
492 */
493/* x86-specific allocations */
494#ifdef CONFIG_SND_DMA_SGBUF
495static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
496{
497 return do_alloc_pages(dmab->dev.dev, size, &dmab->addr, true);
498}
499
500static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
501{
502 do_free_pages(dmab->area, dmab->bytes, true);
503}
504
505static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
506 struct vm_area_struct *area)
507{
508 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
509 return snd_dma_continuous_mmap(dmab, area);
510}
511#else
512static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
513{
514 return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
515}
516
517static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
518{
519 dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
520}
521
522static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
523 struct vm_area_struct *area)
524{
525 return dma_mmap_wc(dmab->dev.dev, area,
526 dmab->area, dmab->addr, dmab->bytes);
527}
528#endif /* CONFIG_SND_DMA_SGBUF */
529
530static const struct snd_malloc_ops snd_dma_wc_ops = {
531 .alloc = snd_dma_wc_alloc,
532 .free = snd_dma_wc_free,
533 .mmap = snd_dma_wc_mmap,
534};
535
536/*
537 * Non-contiguous pages allocator
538 */
539static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size)
540{
541 struct sg_table *sgt;
542 void *p;
543
544#ifdef CONFIG_SND_DMA_SGBUF
545 if (cpu_feature_enabled(X86_FEATURE_XENPV))
546 return snd_dma_sg_fallback_alloc(dmab, size);
547#endif
548 sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,
549 DEFAULT_GFP, 0);
550#ifdef CONFIG_SND_DMA_SGBUF
551 if (!sgt && !get_dma_ops(dmab->dev.dev))
552 return snd_dma_sg_fallback_alloc(dmab, size);
553#endif
554 if (!sgt)
555 return NULL;
556
557 dmab->dev.need_sync = dma_need_sync(dmab->dev.dev,
558 sg_dma_address(sgt->sgl));
559 p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt);
560 if (p) {
561 dmab->private_data = sgt;
562 /* store the first page address for convenience */
563 dmab->addr = snd_sgbuf_get_addr(dmab, 0);
564 } else {
565 dma_free_noncontiguous(dmab->dev.dev, size, sgt, dmab->dev.dir);
566 }
567 return p;
568}
569
570static void snd_dma_noncontig_free(struct snd_dma_buffer *dmab)
571{
572 dma_vunmap_noncontiguous(dmab->dev.dev, dmab->area);
573 dma_free_noncontiguous(dmab->dev.dev, dmab->bytes, dmab->private_data,
574 dmab->dev.dir);
575}
576
577static int snd_dma_noncontig_mmap(struct snd_dma_buffer *dmab,
578 struct vm_area_struct *area)
579{
580 return dma_mmap_noncontiguous(dmab->dev.dev, area,
581 dmab->bytes, dmab->private_data);
582}
583
584static void snd_dma_noncontig_sync(struct snd_dma_buffer *dmab,
585 enum snd_dma_sync_mode mode)
586{
587 if (mode == SNDRV_DMA_SYNC_CPU) {
588 if (dmab->dev.dir == DMA_TO_DEVICE)
589 return;
590 invalidate_kernel_vmap_range(dmab->area, dmab->bytes);
591 dma_sync_sgtable_for_cpu(dmab->dev.dev, dmab->private_data,
592 dmab->dev.dir);
593 } else {
594 if (dmab->dev.dir == DMA_FROM_DEVICE)
595 return;
596 flush_kernel_vmap_range(dmab->area, dmab->bytes);
597 dma_sync_sgtable_for_device(dmab->dev.dev, dmab->private_data,
598 dmab->dev.dir);
599 }
600}
601
602static inline void snd_dma_noncontig_iter_set(struct snd_dma_buffer *dmab,
603 struct sg_page_iter *piter,
604 size_t offset)
605{
606 struct sg_table *sgt = dmab->private_data;
607
608 __sg_page_iter_start(piter, sgt->sgl, sgt->orig_nents,
609 offset >> PAGE_SHIFT);
610}
611
612static dma_addr_t snd_dma_noncontig_get_addr(struct snd_dma_buffer *dmab,
613 size_t offset)
614{
615 struct sg_dma_page_iter iter;
616
617 snd_dma_noncontig_iter_set(dmab, &iter.base, offset);
618 __sg_page_iter_dma_next(&iter);
619 return sg_page_iter_dma_address(&iter) + offset % PAGE_SIZE;
620}
621
622static struct page *snd_dma_noncontig_get_page(struct snd_dma_buffer *dmab,
623 size_t offset)
624{
625 struct sg_page_iter iter;
626
627 snd_dma_noncontig_iter_set(dmab, &iter, offset);
628 __sg_page_iter_next(&iter);
629 return sg_page_iter_page(&iter);
630}
631
632static unsigned int
633snd_dma_noncontig_get_chunk_size(struct snd_dma_buffer *dmab,
634 unsigned int ofs, unsigned int size)
635{
636 struct sg_dma_page_iter iter;
637 unsigned int start, end;
638 unsigned long addr;
639
640 start = ALIGN_DOWN(ofs, PAGE_SIZE);
641 end = ofs + size - 1; /* the last byte address */
642 snd_dma_noncontig_iter_set(dmab, &iter.base, start);
643 if (!__sg_page_iter_dma_next(&iter))
644 return 0;
645 /* check page continuity */
646 addr = sg_page_iter_dma_address(&iter);
647 for (;;) {
648 start += PAGE_SIZE;
649 if (start > end)
650 break;
651 addr += PAGE_SIZE;
652 if (!__sg_page_iter_dma_next(&iter) ||
653 sg_page_iter_dma_address(&iter) != addr)
654 return start - ofs;
655 }
656 /* ok, all on continuous pages */
657 return size;
658}
659
660static const struct snd_malloc_ops snd_dma_noncontig_ops = {
661 .alloc = snd_dma_noncontig_alloc,
662 .free = snd_dma_noncontig_free,
663 .mmap = snd_dma_noncontig_mmap,
664 .sync = snd_dma_noncontig_sync,
665 .get_addr = snd_dma_noncontig_get_addr,
666 .get_page = snd_dma_noncontig_get_page,
667 .get_chunk_size = snd_dma_noncontig_get_chunk_size,
668};
669
670/* x86-specific SG-buffer with WC pages */
671#ifdef CONFIG_SND_DMA_SGBUF
672#define sg_wc_address(it) ((unsigned long)page_address(sg_page_iter_page(it)))
673
674static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
675{
676 void *p = snd_dma_noncontig_alloc(dmab, size);
677 struct sg_table *sgt = dmab->private_data;
678 struct sg_page_iter iter;
679
680 if (!p)
681 return NULL;
682 if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG)
683 return p;
684 for_each_sgtable_page(sgt, &iter, 0)
685 set_memory_wc(sg_wc_address(&iter), 1);
686 return p;
687}
688
689static void snd_dma_sg_wc_free(struct snd_dma_buffer *dmab)
690{
691 struct sg_table *sgt = dmab->private_data;
692 struct sg_page_iter iter;
693
694 for_each_sgtable_page(sgt, &iter, 0)
695 set_memory_wb(sg_wc_address(&iter), 1);
696 snd_dma_noncontig_free(dmab);
697}
698
699static int snd_dma_sg_wc_mmap(struct snd_dma_buffer *dmab,
700 struct vm_area_struct *area)
701{
702 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
703 return dma_mmap_noncontiguous(dmab->dev.dev, area,
704 dmab->bytes, dmab->private_data);
705}
706
707static const struct snd_malloc_ops snd_dma_sg_wc_ops = {
708 .alloc = snd_dma_sg_wc_alloc,
709 .free = snd_dma_sg_wc_free,
710 .mmap = snd_dma_sg_wc_mmap,
711 .sync = snd_dma_noncontig_sync,
712 .get_addr = snd_dma_noncontig_get_addr,
713 .get_page = snd_dma_noncontig_get_page,
714 .get_chunk_size = snd_dma_noncontig_get_chunk_size,
715};
716
717/* Fallback SG-buffer allocations for x86 */
718struct snd_dma_sg_fallback {
719 bool use_dma_alloc_coherent;
720 size_t count;
721 struct page **pages;
722 /* DMA address array; the first page contains #pages in ~PAGE_MASK */
723 dma_addr_t *addrs;
724};
725
726static void __snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab,
727 struct snd_dma_sg_fallback *sgbuf)
728{
729 size_t i, size;
730
731 if (sgbuf->pages && sgbuf->addrs) {
732 i = 0;
733 while (i < sgbuf->count) {
734 if (!sgbuf->pages[i] || !sgbuf->addrs[i])
735 break;
736 size = sgbuf->addrs[i] & ~PAGE_MASK;
737 if (WARN_ON(!size))
738 break;
739 if (sgbuf->use_dma_alloc_coherent)
740 dma_free_coherent(dmab->dev.dev, size << PAGE_SHIFT,
741 page_address(sgbuf->pages[i]),
742 sgbuf->addrs[i] & PAGE_MASK);
743 else
744 do_free_pages(page_address(sgbuf->pages[i]),
745 size << PAGE_SHIFT, false);
746 i += size;
747 }
748 }
749 kvfree(sgbuf->pages);
750 kvfree(sgbuf->addrs);
751 kfree(sgbuf);
752}
753
754static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size)
755{
756 struct snd_dma_sg_fallback *sgbuf;
757 struct page **pagep, *curp;
758 size_t chunk, npages;
759 dma_addr_t *addrp;
760 dma_addr_t addr;
761 void *p;
762
763 /* correct the type */
764 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_SG)
765 dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK;
766 else if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
767 dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
768
769 sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
770 if (!sgbuf)
771 return NULL;
772 sgbuf->use_dma_alloc_coherent = cpu_feature_enabled(X86_FEATURE_XENPV);
773 size = PAGE_ALIGN(size);
774 sgbuf->count = size >> PAGE_SHIFT;
775 sgbuf->pages = kvcalloc(sgbuf->count, sizeof(*sgbuf->pages), GFP_KERNEL);
776 sgbuf->addrs = kvcalloc(sgbuf->count, sizeof(*sgbuf->addrs), GFP_KERNEL);
777 if (!sgbuf->pages || !sgbuf->addrs)
778 goto error;
779
780 pagep = sgbuf->pages;
781 addrp = sgbuf->addrs;
782 chunk = (PAGE_SIZE - 1) << PAGE_SHIFT; /* to fit in low bits in addrs */
783 while (size > 0) {
784 chunk = min(size, chunk);
785 if (sgbuf->use_dma_alloc_coherent)
786 p = dma_alloc_coherent(dmab->dev.dev, chunk, &addr, DEFAULT_GFP);
787 else
788 p = do_alloc_pages(dmab->dev.dev, chunk, &addr, false);
789 if (!p) {
790 if (chunk <= PAGE_SIZE)
791 goto error;
792 chunk >>= 1;
793 chunk = PAGE_SIZE << get_order(chunk);
794 continue;
795 }
796
797 size -= chunk;
798 /* fill pages */
799 npages = chunk >> PAGE_SHIFT;
800 *addrp = npages; /* store in lower bits */
801 curp = virt_to_page(p);
802 while (npages--) {
803 *pagep++ = curp++;
804 *addrp++ |= addr;
805 addr += PAGE_SIZE;
806 }
807 }
808
809 p = vmap(sgbuf->pages, sgbuf->count, VM_MAP, PAGE_KERNEL);
810 if (!p)
811 goto error;
812
813 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
814 set_pages_array_wc(sgbuf->pages, sgbuf->count);
815
816 dmab->private_data = sgbuf;
817 /* store the first page address for convenience */
818 dmab->addr = sgbuf->addrs[0] & PAGE_MASK;
819 return p;
820
821 error:
822 __snd_dma_sg_fallback_free(dmab, sgbuf);
823 return NULL;
824}
825
826static void snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab)
827{
828 struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
829
830 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
831 set_pages_array_wb(sgbuf->pages, sgbuf->count);
832 vunmap(dmab->area);
833 __snd_dma_sg_fallback_free(dmab, dmab->private_data);
834}
835
836static dma_addr_t snd_dma_sg_fallback_get_addr(struct snd_dma_buffer *dmab,
837 size_t offset)
838{
839 struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
840 size_t index = offset >> PAGE_SHIFT;
841
842 return (sgbuf->addrs[index] & PAGE_MASK) | (offset & ~PAGE_MASK);
843}
844
845static int snd_dma_sg_fallback_mmap(struct snd_dma_buffer *dmab,
846 struct vm_area_struct *area)
847{
848 struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
849
850 if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
851 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
852 return vm_map_pages(area, sgbuf->pages, sgbuf->count);
853}
854
855static const struct snd_malloc_ops snd_dma_sg_fallback_ops = {
856 .alloc = snd_dma_sg_fallback_alloc,
857 .free = snd_dma_sg_fallback_free,
858 .mmap = snd_dma_sg_fallback_mmap,
859 .get_addr = snd_dma_sg_fallback_get_addr,
860 /* reuse vmalloc helpers */
861 .get_page = snd_dma_vmalloc_get_page,
862 .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
863};
864#endif /* CONFIG_SND_DMA_SGBUF */
865
866/*
867 * Non-coherent pages allocator
868 */
869static void *snd_dma_noncoherent_alloc(struct snd_dma_buffer *dmab, size_t size)
870{
871 void *p;
872
873 p = dma_alloc_noncoherent(dmab->dev.dev, size, &dmab->addr,
874 dmab->dev.dir, DEFAULT_GFP);
875 if (p)
876 dmab->dev.need_sync = dma_need_sync(dmab->dev.dev, dmab->addr);
877 return p;
878}
879
880static void snd_dma_noncoherent_free(struct snd_dma_buffer *dmab)
881{
882 dma_free_noncoherent(dmab->dev.dev, dmab->bytes, dmab->area,
883 dmab->addr, dmab->dev.dir);
884}
885
886static int snd_dma_noncoherent_mmap(struct snd_dma_buffer *dmab,
887 struct vm_area_struct *area)
888{
889 area->vm_page_prot = vm_get_page_prot(area->vm_flags);
890 return dma_mmap_pages(dmab->dev.dev, area,
891 area->vm_end - area->vm_start,
892 virt_to_page(dmab->area));
893}
894
895static void snd_dma_noncoherent_sync(struct snd_dma_buffer *dmab,
896 enum snd_dma_sync_mode mode)
897{
898 if (mode == SNDRV_DMA_SYNC_CPU) {
899 if (dmab->dev.dir != DMA_TO_DEVICE)
900 dma_sync_single_for_cpu(dmab->dev.dev, dmab->addr,
901 dmab->bytes, dmab->dev.dir);
902 } else {
903 if (dmab->dev.dir != DMA_FROM_DEVICE)
904 dma_sync_single_for_device(dmab->dev.dev, dmab->addr,
905 dmab->bytes, dmab->dev.dir);
906 }
907}
908
909static const struct snd_malloc_ops snd_dma_noncoherent_ops = {
910 .alloc = snd_dma_noncoherent_alloc,
911 .free = snd_dma_noncoherent_free,
912 .mmap = snd_dma_noncoherent_mmap,
913 .sync = snd_dma_noncoherent_sync,
914};
915
916#endif /* CONFIG_HAS_DMA */
917
918/*
919 * Entry points
920 */
921static const struct snd_malloc_ops *snd_dma_ops[] = {
922 [SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops,
923 [SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops,
924#ifdef CONFIG_HAS_DMA
925 [SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops,
926 [SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops,
927 [SNDRV_DMA_TYPE_NONCONTIG] = &snd_dma_noncontig_ops,
928 [SNDRV_DMA_TYPE_NONCOHERENT] = &snd_dma_noncoherent_ops,
929#ifdef CONFIG_SND_DMA_SGBUF
930 [SNDRV_DMA_TYPE_DEV_WC_SG] = &snd_dma_sg_wc_ops,
931#endif
932#ifdef CONFIG_GENERIC_ALLOCATOR
933 [SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
934#endif /* CONFIG_GENERIC_ALLOCATOR */
935#ifdef CONFIG_SND_DMA_SGBUF
936 [SNDRV_DMA_TYPE_DEV_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
937 [SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
938#endif
939#endif /* CONFIG_HAS_DMA */
940};
941
942static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
943{
944 if (WARN_ON_ONCE(!dmab))
945 return NULL;
946 if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||
947 dmab->dev.type >= ARRAY_SIZE(snd_dma_ops)))
948 return NULL;
949 return snd_dma_ops[dmab->dev.type];
950}