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Add linux-next specific files for 20110716
[linux-2.6/next.git] / sound / pci / emu10k1 / memory.c
blobc250614dadd0c9c2d0ed3dc4cdfdca7a8148332b
1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
4 *
5 * EMU10K1 memory page allocation (PTB area)
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/pci.h>
25 #include <linux/gfp.h>
26 #include <linux/time.h>
27 #include <linux/mutex.h>
28
29 #include <sound/core.h>
30 #include <sound/emu10k1.h>
31
32 /* page arguments of these two macros are Emu page (4096 bytes), not like
33 * aligned pages in others
34 */
35 #define __set_ptb_entry(emu,page,addr) \
36 (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
37
38 #define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
39 #define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES)
40 /* get aligned page from offset address */
41 #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
42 /* get offset address from aligned page */
43 #define aligned_page_offset(page) ((page) << PAGE_SHIFT)
44
45 #if PAGE_SIZE == 4096
46 /* page size == EMUPAGESIZE */
47 /* fill PTB entrie(s) corresponding to page with addr */
48 #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
49 /* fill PTB entrie(s) corresponding to page with silence pointer */
50 #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
51 #else
52 /* fill PTB entries -- we need to fill UNIT_PAGES entries */
53 static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
54 {
55 int i;
56 page *= UNIT_PAGES;
57 for (i = 0; i < UNIT_PAGES; i++, page++) {
58 __set_ptb_entry(emu, page, addr);
59 addr += EMUPAGESIZE;
60 }
61 }
62 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
63 {
64 int i;
65 page *= UNIT_PAGES;
66 for (i = 0; i < UNIT_PAGES; i++, page++)
67 /* do not increment ptr */
68 __set_ptb_entry(emu, page, emu->silent_page.addr);
69 }
70 #endif /* PAGE_SIZE */
71
72
73 /*
74 */
75 static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
76 static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
77
78 #define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
79
80
81 /* initialize emu10k1 part */
82 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
83 {
84 blk->mapped_page = -1;
85 INIT_LIST_HEAD(&blk->mapped_link);
86 INIT_LIST_HEAD(&blk->mapped_order_link);
87 blk->map_locked = 0;
88
89 blk->first_page = get_aligned_page(blk->mem.offset);
90 blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
91 blk->pages = blk->last_page - blk->first_page + 1;
92 }
93
94 /*
95 * search empty region on PTB with the given size
96 *
97 * if an empty region is found, return the page and store the next mapped block
98 * in nextp
99 * if not found, return a negative error code.
100 */
101 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
102 {
103 int page = 0, found_page = -ENOMEM;
104 int max_size = npages;
105 int size;
106 struct list_head *candidate = &emu->mapped_link_head;
107 struct list_head *pos;
108
109 list_for_each (pos, &emu->mapped_link_head) {
110 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
111 if (blk->mapped_page < 0)
112 continue;
113 size = blk->mapped_page - page;
114 if (size == npages) {
115 *nextp = pos;
116 return page;
117 }
118 else if (size > max_size) {
119 /* we look for the maximum empty hole */
120 max_size = size;
121 candidate = pos;
122 found_page = page;
123 }
124 page = blk->mapped_page + blk->pages;
125 }
126 size = MAX_ALIGN_PAGES - page;
127 if (size >= max_size) {
128 *nextp = pos;
129 return page;
130 }
131 *nextp = candidate;
132 return found_page;
133 }
134
135 /*
136 * map a memory block onto emu10k1's PTB
137 *
138 * call with memblk_lock held
139 */
140 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
141 {
142 int page, pg;
143 struct list_head *next;
144
145 page = search_empty_map_area(emu, blk->pages, &next);
146 if (page < 0) /* not found */
147 return page;
148 /* insert this block in the proper position of mapped list */
149 list_add_tail(&blk->mapped_link, next);
150 /* append this as a newest block in order list */
151 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
152 blk->mapped_page = page;
153 /* fill PTB */
154 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
155 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
156 page++;
157 }
158 return 0;
159 }
160
161 /*
162 * unmap the block
163 * return the size of resultant empty pages
164 *
165 * call with memblk_lock held
166 */
167 static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
168 {
169 int start_page, end_page, mpage, pg;
170 struct list_head *p;
171 struct snd_emu10k1_memblk *q;
172
173 /* calculate the expected size of empty region */
174 if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
175 q = get_emu10k1_memblk(p, mapped_link);
176 start_page = q->mapped_page + q->pages;
177 } else
178 start_page = 0;
179 if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
180 q = get_emu10k1_memblk(p, mapped_link);
181 end_page = q->mapped_page;
182 } else
183 end_page = MAX_ALIGN_PAGES;
184
185 /* remove links */
186 list_del(&blk->mapped_link);
187 list_del(&blk->mapped_order_link);
188 /* clear PTB */
189 mpage = blk->mapped_page;
190 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
191 set_silent_ptb(emu, mpage);
192 mpage++;
193 }
194 blk->mapped_page = -1;
195 return end_page - start_page; /* return the new empty size */
196 }
197
198 /*
199 * search empty pages with the given size, and create a memory block
200 *
201 * unlike synth_alloc the memory block is aligned to the page start
202 */
203 static struct snd_emu10k1_memblk *
204 search_empty(struct snd_emu10k1 *emu, int size)
205 {
206 struct list_head *p;
207 struct snd_emu10k1_memblk *blk;
208 int page, psize;
209
210 psize = get_aligned_page(size + PAGE_SIZE -1);
211 page = 0;
212 list_for_each(p, &emu->memhdr->block) {
213 blk = get_emu10k1_memblk(p, mem.list);
214 if (page + psize <= blk->first_page)
215 goto __found_pages;
216 page = blk->last_page + 1;
217 }
218 if (page + psize > emu->max_cache_pages)
219 return NULL;
220
221 __found_pages:
222 /* create a new memory block */
223 blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
224 if (blk == NULL)
225 return NULL;
226 blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
227 emu10k1_memblk_init(blk);
228 return blk;
229 }
230
231
232 /*
233 * check if the given pointer is valid for pages
234 */
235 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
236 {
237 if (addr & ~emu->dma_mask) {
238 snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
239 return 0;
240 }
241 if (addr & (EMUPAGESIZE-1)) {
242 snd_printk(KERN_ERR "page is not aligned\n");
243 return 0;
244 }
245 return 1;
246 }
247
248 /*
249 * map the given memory block on PTB.
250 * if the block is already mapped, update the link order.
251 * if no empty pages are found, tries to release unused memory blocks
252 * and retry the mapping.
253 */
254 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
255 {
256 int err;
257 int size;
258 struct list_head *p, *nextp;
259 struct snd_emu10k1_memblk *deleted;
260 unsigned long flags;
261
262 spin_lock_irqsave(&emu->memblk_lock, flags);
263 if (blk->mapped_page >= 0) {
264 /* update order link */
265 list_del(&blk->mapped_order_link);
266 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
267 spin_unlock_irqrestore(&emu->memblk_lock, flags);
268 return 0;
269 }
270 if ((err = map_memblk(emu, blk)) < 0) {
271 /* no enough page - try to unmap some blocks */
272 /* starting from the oldest block */
273 p = emu->mapped_order_link_head.next;
274 for (; p != &emu->mapped_order_link_head; p = nextp) {
275 nextp = p->next;
276 deleted = get_emu10k1_memblk(p, mapped_order_link);
277 if (deleted->map_locked)
278 continue;
279 size = unmap_memblk(emu, deleted);
280 if (size >= blk->pages) {
281 /* ok the empty region is enough large */
282 err = map_memblk(emu, blk);
283 break;
284 }
285 }
286 }
287 spin_unlock_irqrestore(&emu->memblk_lock, flags);
288 return err;
289 }
290
291 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
292
293 /*
294 * page allocation for DMA
295 */
296 struct snd_util_memblk *
297 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
298 {
299 struct snd_pcm_runtime *runtime = substream->runtime;
300 struct snd_util_memhdr *hdr;
301 struct snd_emu10k1_memblk *blk;
302 int page, err, idx;
303
304 if (snd_BUG_ON(!emu))
305 return NULL;
306 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
307 runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE))
308 return NULL;
309 hdr = emu->memhdr;
310 if (snd_BUG_ON(!hdr))
311 return NULL;
312
313 idx = runtime->period_size >= runtime->buffer_size ?
314 (emu->delay_pcm_irq * 2) : 0;
315 mutex_lock(&hdr->block_mutex);
316 blk = search_empty(emu, runtime->dma_bytes + idx);
317 if (blk == NULL) {
318 mutex_unlock(&hdr->block_mutex);
319 return NULL;
320 }
321 /* fill buffer addresses but pointers are not stored so that
322 * snd_free_pci_page() is not called in in synth_free()
323 */
324 idx = 0;
325 for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
326 unsigned long ofs = idx << PAGE_SHIFT;
327 dma_addr_t addr;
328 addr = snd_pcm_sgbuf_get_addr(substream, ofs);
329 if (! is_valid_page(emu, addr)) {
330 printk(KERN_ERR "emu: failure page = %d\n", idx);
331 mutex_unlock(&hdr->block_mutex);
332 return NULL;
333 }
334 emu->page_addr_table[page] = addr;
335 emu->page_ptr_table[page] = NULL;
336 }
337
338 /* set PTB entries */
339 blk->map_locked = 1; /* do not unmap this block! */
340 err = snd_emu10k1_memblk_map(emu, blk);
341 if (err < 0) {
342 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
343 mutex_unlock(&hdr->block_mutex);
344 return NULL;
345 }
346 mutex_unlock(&hdr->block_mutex);
347 return (struct snd_util_memblk *)blk;
348 }
349
350
351 /*
352 * release DMA buffer from page table
353 */
354 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
355 {
356 if (snd_BUG_ON(!emu || !blk))
357 return -EINVAL;
358 return snd_emu10k1_synth_free(emu, blk);
359 }
360
361
362 /*
363 * memory allocation using multiple pages (for synth)
364 * Unlike the DMA allocation above, non-contiguous pages are assined.
365 */
366
367 /*
368 * allocate a synth sample area
369 */
370 struct snd_util_memblk *
371 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
372 {
373 struct snd_emu10k1_memblk *blk;
374 struct snd_util_memhdr *hdr = hw->memhdr;
375
376 mutex_lock(&hdr->block_mutex);
377 blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
378 if (blk == NULL) {
379 mutex_unlock(&hdr->block_mutex);
380 return NULL;
381 }
382 if (synth_alloc_pages(hw, blk)) {
383 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
384 mutex_unlock(&hdr->block_mutex);
385 return NULL;
386 }
387 snd_emu10k1_memblk_map(hw, blk);
388 mutex_unlock(&hdr->block_mutex);
389 return (struct snd_util_memblk *)blk;
390 }
391
392 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
393
394 /*
395 * free a synth sample area
396 */
397 int
398 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
399 {
400 struct snd_util_memhdr *hdr = emu->memhdr;
401 struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
402 unsigned long flags;
403
404 mutex_lock(&hdr->block_mutex);
405 spin_lock_irqsave(&emu->memblk_lock, flags);
406 if (blk->mapped_page >= 0)
407 unmap_memblk(emu, blk);
408 spin_unlock_irqrestore(&emu->memblk_lock, flags);
409 synth_free_pages(emu, blk);
410 __snd_util_mem_free(hdr, memblk);
411 mutex_unlock(&hdr->block_mutex);
412 return 0;
413 }
414
415 EXPORT_SYMBOL(snd_emu10k1_synth_free);
416
417 /* check new allocation range */
418 static void get_single_page_range(struct snd_util_memhdr *hdr,
419 struct snd_emu10k1_memblk *blk,
420 int *first_page_ret, int *last_page_ret)
421 {
422 struct list_head *p;
423 struct snd_emu10k1_memblk *q;
424 int first_page, last_page;
425 first_page = blk->first_page;
426 if ((p = blk->mem.list.prev) != &hdr->block) {
427 q = get_emu10k1_memblk(p, mem.list);
428 if (q->last_page == first_page)
429 first_page++; /* first page was already allocated */
430 }
431 last_page = blk->last_page;
432 if ((p = blk->mem.list.next) != &hdr->block) {
433 q = get_emu10k1_memblk(p, mem.list);
434 if (q->first_page == last_page)
435 last_page--; /* last page was already allocated */
436 }
437 *first_page_ret = first_page;
438 *last_page_ret = last_page;
439 }
440
441 /* release allocated pages */
442 static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
443 int last_page)
444 {
445 int page;
446
447 for (page = first_page; page <= last_page; page++) {
448 free_page((unsigned long)emu->page_ptr_table[page]);
449 emu->page_addr_table[page] = 0;
450 emu->page_ptr_table[page] = NULL;
451 }
452 }
453
454 /*
455 * allocate kernel pages
456 */
457 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
458 {
459 int page, first_page, last_page;
460
461 emu10k1_memblk_init(blk);
462 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
463 /* allocate kernel pages */
464 for (page = first_page; page <= last_page; page++) {
465 /* first try to allocate from <4GB zone */
466 struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
467 __GFP_NOWARN);
468 if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
469 if (p)
470 __free_page(p);
471 /* try to allocate from <16MB zone */
472 p = alloc_page(GFP_ATOMIC | GFP_DMA |
473 __GFP_NORETRY | /* no OOM-killer */
474 __GFP_NOWARN);
475 }
476 if (!p) {
477 __synth_free_pages(emu, first_page, page - 1);
478 return -ENOMEM;
479 }
480 emu->page_addr_table[page] = page_to_phys(p);
481 emu->page_ptr_table[page] = page_address(p);
482 }
483 return 0;
484 }
485
486 /*
487 * free pages
488 */
489 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
490 {
491 int first_page, last_page;
492
493 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
494 __synth_free_pages(emu, first_page, last_page);
495 return 0;
496 }
497
498 /* calculate buffer pointer from offset address */
499 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
500 {
501 char *ptr;
502 if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
503 return NULL;
504 ptr = emu->page_ptr_table[page];
505 if (! ptr) {
506 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
507 return NULL;
508 }
509 ptr += offset & (PAGE_SIZE - 1);
510 return (void*)ptr;
511 }
512
513 /*
514 * bzero(blk + offset, size)
515 */
516 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
517 int offset, int size)
518 {
519 int page, nextofs, end_offset, temp, temp1;
520 void *ptr;
521 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
522
523 offset += blk->offset & (PAGE_SIZE - 1);
524 end_offset = offset + size;
525 page = get_aligned_page(offset);
526 do {
527 nextofs = aligned_page_offset(page + 1);
528 temp = nextofs - offset;
529 temp1 = end_offset - offset;
530 if (temp1 < temp)
531 temp = temp1;
532 ptr = offset_ptr(emu, page + p->first_page, offset);
533 if (ptr)
534 memset(ptr, 0, temp);
535 offset = nextofs;
536 page++;
537 } while (offset < end_offset);
538 return 0;
539 }
540
541 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
542
543 /*
544 * copy_from_user(blk + offset, data, size)
545 */
546 int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
547 int offset, const char __user *data, int size)
548 {
549 int page, nextofs, end_offset, temp, temp1;
550 void *ptr;
551 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
552
553 offset += blk->offset & (PAGE_SIZE - 1);
554 end_offset = offset + size;
555 page = get_aligned_page(offset);
556 do {
557 nextofs = aligned_page_offset(page + 1);
558 temp = nextofs - offset;
559 temp1 = end_offset - offset;
560 if (temp1 < temp)
561 temp = temp1;
562 ptr = offset_ptr(emu, page + p->first_page, offset);
563 if (ptr && copy_from_user(ptr, data, temp))
564 return -EFAULT;
565 offset = nextofs;
566 data += temp;
567 page++;
568 } while (offset < end_offset);
569 return 0;
570 }
571
572 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);
linux-next