Linux 2.6.24.5
[linux/fpc-iii.git] / sound / pci / emu10k1 / memory.c
blob48097c6bb15c20eb679cc23f17c8a1763a2cde79
1 /*
2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
3 * Copyright (c) by Takashi Iwai <tiwai@suse.de>
5 * EMU10K1 memory page allocation (PTB area)
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 <sound/driver.h>
25 #include <linux/pci.h>
26 #include <linux/time.h>
27 #include <linux/mutex.h>
29 #include <sound/core.h>
30 #include <sound/emu10k1.h>
32 /* page arguments of these two macros are Emu page (4096 bytes), not like
33 * aligned pages in others
35 #define __set_ptb_entry(emu,page,addr) \
36 (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
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)
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)
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;
62 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
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);
70 #endif /* PAGE_SIZE */
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);
78 #define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
81 /* initialize emu10k1 part */
82 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
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;
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;
95 * search empty region on PTB with the given size
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.
101 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
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;
109 list_for_each (pos, &emu->mapped_link_head) {
110 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
111 snd_assert(blk->mapped_page >= 0, continue);
112 size = blk->mapped_page - page;
113 if (size == npages) {
114 *nextp = pos;
115 return page;
117 else if (size > max_size) {
118 /* we look for the maximum empty hole */
119 max_size = size;
120 candidate = pos;
121 found_page = page;
123 page = blk->mapped_page + blk->pages;
125 size = MAX_ALIGN_PAGES - page;
126 if (size >= max_size) {
127 *nextp = pos;
128 return page;
130 *nextp = candidate;
131 return found_page;
135 * map a memory block onto emu10k1's PTB
137 * call with memblk_lock held
139 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
141 int page, pg;
142 struct list_head *next;
144 page = search_empty_map_area(emu, blk->pages, &next);
145 if (page < 0) /* not found */
146 return page;
147 /* insert this block in the proper position of mapped list */
148 list_add_tail(&blk->mapped_link, next);
149 /* append this as a newest block in order list */
150 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
151 blk->mapped_page = page;
152 /* fill PTB */
153 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
154 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
155 page++;
157 return 0;
161 * unmap the block
162 * return the size of resultant empty pages
164 * call with memblk_lock held
166 static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
168 int start_page, end_page, mpage, pg;
169 struct list_head *p;
170 struct snd_emu10k1_memblk *q;
172 /* calculate the expected size of empty region */
173 if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
174 q = get_emu10k1_memblk(p, mapped_link);
175 start_page = q->mapped_page + q->pages;
176 } else
177 start_page = 0;
178 if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
179 q = get_emu10k1_memblk(p, mapped_link);
180 end_page = q->mapped_page;
181 } else
182 end_page = MAX_ALIGN_PAGES;
184 /* remove links */
185 list_del(&blk->mapped_link);
186 list_del(&blk->mapped_order_link);
187 /* clear PTB */
188 mpage = blk->mapped_page;
189 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
190 set_silent_ptb(emu, mpage);
191 mpage++;
193 blk->mapped_page = -1;
194 return end_page - start_page; /* return the new empty size */
198 * search empty pages with the given size, and create a memory block
200 * unlike synth_alloc the memory block is aligned to the page start
202 static struct snd_emu10k1_memblk *
203 search_empty(struct snd_emu10k1 *emu, int size)
205 struct list_head *p;
206 struct snd_emu10k1_memblk *blk;
207 int page, psize;
209 psize = get_aligned_page(size + PAGE_SIZE -1);
210 page = 0;
211 list_for_each(p, &emu->memhdr->block) {
212 blk = get_emu10k1_memblk(p, mem.list);
213 if (page + psize <= blk->first_page)
214 goto __found_pages;
215 page = blk->last_page + 1;
217 if (page + psize > emu->max_cache_pages)
218 return NULL;
220 __found_pages:
221 /* create a new memory block */
222 blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
223 if (blk == NULL)
224 return NULL;
225 blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
226 emu10k1_memblk_init(blk);
227 return blk;
232 * check if the given pointer is valid for pages
234 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
236 if (addr & ~emu->dma_mask) {
237 snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
238 return 0;
240 if (addr & (EMUPAGESIZE-1)) {
241 snd_printk(KERN_ERR "page is not aligned\n");
242 return 0;
244 return 1;
248 * map the given memory block on PTB.
249 * if the block is already mapped, update the link order.
250 * if no empty pages are found, tries to release unsed memory blocks
251 * and retry the mapping.
253 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
255 int err;
256 int size;
257 struct list_head *p, *nextp;
258 struct snd_emu10k1_memblk *deleted;
259 unsigned long flags;
261 spin_lock_irqsave(&emu->memblk_lock, flags);
262 if (blk->mapped_page >= 0) {
263 /* update order link */
264 list_del(&blk->mapped_order_link);
265 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
266 spin_unlock_irqrestore(&emu->memblk_lock, flags);
267 return 0;
269 if ((err = map_memblk(emu, blk)) < 0) {
270 /* no enough page - try to unmap some blocks */
271 /* starting from the oldest block */
272 p = emu->mapped_order_link_head.next;
273 for (; p != &emu->mapped_order_link_head; p = nextp) {
274 nextp = p->next;
275 deleted = get_emu10k1_memblk(p, mapped_order_link);
276 if (deleted->map_locked)
277 continue;
278 size = unmap_memblk(emu, deleted);
279 if (size >= blk->pages) {
280 /* ok the empty region is enough large */
281 err = map_memblk(emu, blk);
282 break;
286 spin_unlock_irqrestore(&emu->memblk_lock, flags);
287 return err;
290 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
293 * page allocation for DMA
295 struct snd_util_memblk *
296 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
300 struct snd_util_memhdr *hdr;
301 struct snd_emu10k1_memblk *blk;
302 int page, err, idx;
304 snd_assert(emu, return NULL);
305 snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL);
306 hdr = emu->memhdr;
307 snd_assert(hdr, return NULL);
309 mutex_lock(&hdr->block_mutex);
310 blk = search_empty(emu, runtime->dma_bytes);
311 if (blk == NULL) {
312 mutex_unlock(&hdr->block_mutex);
313 return NULL;
315 /* fill buffer addresses but pointers are not stored so that
316 * snd_free_pci_page() is not called in in synth_free()
318 idx = 0;
319 for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
320 dma_addr_t addr;
321 #ifdef CONFIG_SND_DEBUG
322 if (idx >= sgbuf->pages) {
323 printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n",
324 blk->first_page, blk->last_page, sgbuf->pages);
325 mutex_unlock(&hdr->block_mutex);
326 return NULL;
328 #endif
329 addr = sgbuf->table[idx].addr;
330 if (! is_valid_page(emu, addr)) {
331 printk(KERN_ERR "emu: failure page = %d\n", idx);
332 mutex_unlock(&hdr->block_mutex);
333 return NULL;
335 emu->page_addr_table[page] = addr;
336 emu->page_ptr_table[page] = NULL;
339 /* set PTB entries */
340 blk->map_locked = 1; /* do not unmap this block! */
341 err = snd_emu10k1_memblk_map(emu, blk);
342 if (err < 0) {
343 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
344 mutex_unlock(&hdr->block_mutex);
345 return NULL;
347 mutex_unlock(&hdr->block_mutex);
348 return (struct snd_util_memblk *)blk;
353 * release DMA buffer from page table
355 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
357 snd_assert(emu && blk, return -EINVAL);
358 return snd_emu10k1_synth_free(emu, blk);
363 * memory allocation using multiple pages (for synth)
364 * Unlike the DMA allocation above, non-contiguous pages are assined.
368 * allocate a synth sample area
370 struct snd_util_memblk *
371 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
373 struct snd_emu10k1_memblk *blk;
374 struct snd_util_memhdr *hdr = hw->memhdr;
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;
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;
387 snd_emu10k1_memblk_map(hw, blk);
388 mutex_unlock(&hdr->block_mutex);
389 return (struct snd_util_memblk *)blk;
392 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
395 * free a synth sample area
398 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
400 struct snd_util_memhdr *hdr = emu->memhdr;
401 struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
402 unsigned long flags;
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;
415 EXPORT_SYMBOL(snd_emu10k1_synth_free);
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)
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 */
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 */
437 *first_page_ret = first_page;
438 *last_page_ret = last_page;
442 * allocate kernel pages
444 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
446 int page, first_page, last_page;
447 struct snd_dma_buffer dmab;
449 emu10k1_memblk_init(blk);
450 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
451 /* allocate kernel pages */
452 for (page = first_page; page <= last_page; page++) {
453 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci),
454 PAGE_SIZE, &dmab) < 0)
455 goto __fail;
456 if (! is_valid_page(emu, dmab.addr)) {
457 snd_dma_free_pages(&dmab);
458 goto __fail;
460 emu->page_addr_table[page] = dmab.addr;
461 emu->page_ptr_table[page] = dmab.area;
463 return 0;
465 __fail:
466 /* release allocated pages */
467 last_page = page - 1;
468 for (page = first_page; page <= last_page; page++) {
469 dmab.area = emu->page_ptr_table[page];
470 dmab.addr = emu->page_addr_table[page];
471 dmab.bytes = PAGE_SIZE;
472 snd_dma_free_pages(&dmab);
473 emu->page_addr_table[page] = 0;
474 emu->page_ptr_table[page] = NULL;
477 return -ENOMEM;
481 * free pages
483 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
485 int page, first_page, last_page;
486 struct snd_dma_buffer dmab;
488 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
489 dmab.dev.type = SNDRV_DMA_TYPE_DEV;
490 dmab.dev.dev = snd_dma_pci_data(emu->pci);
491 for (page = first_page; page <= last_page; page++) {
492 if (emu->page_ptr_table[page] == NULL)
493 continue;
494 dmab.area = emu->page_ptr_table[page];
495 dmab.addr = emu->page_addr_table[page];
496 dmab.bytes = PAGE_SIZE;
497 snd_dma_free_pages(&dmab);
498 emu->page_addr_table[page] = 0;
499 emu->page_ptr_table[page] = NULL;
502 return 0;
505 /* calculate buffer pointer from offset address */
506 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
508 char *ptr;
509 snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL);
510 ptr = emu->page_ptr_table[page];
511 if (! ptr) {
512 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
513 return NULL;
515 ptr += offset & (PAGE_SIZE - 1);
516 return (void*)ptr;
520 * bzero(blk + offset, size)
522 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
523 int offset, int size)
525 int page, nextofs, end_offset, temp, temp1;
526 void *ptr;
527 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
529 offset += blk->offset & (PAGE_SIZE - 1);
530 end_offset = offset + size;
531 page = get_aligned_page(offset);
532 do {
533 nextofs = aligned_page_offset(page + 1);
534 temp = nextofs - offset;
535 temp1 = end_offset - offset;
536 if (temp1 < temp)
537 temp = temp1;
538 ptr = offset_ptr(emu, page + p->first_page, offset);
539 if (ptr)
540 memset(ptr, 0, temp);
541 offset = nextofs;
542 page++;
543 } while (offset < end_offset);
544 return 0;
547 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
550 * copy_from_user(blk + offset, data, size)
552 int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
553 int offset, const char __user *data, int size)
555 int page, nextofs, end_offset, temp, temp1;
556 void *ptr;
557 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
559 offset += blk->offset & (PAGE_SIZE - 1);
560 end_offset = offset + size;
561 page = get_aligned_page(offset);
562 do {
563 nextofs = aligned_page_offset(page + 1);
564 temp = nextofs - offset;
565 temp1 = end_offset - offset;
566 if (temp1 < temp)
567 temp = temp1;
568 ptr = offset_ptr(emu, page + p->first_page, offset);
569 if (ptr && copy_from_user(ptr, data, temp))
570 return -EFAULT;
571 offset = nextofs;
572 data += temp;
573 page++;
574 } while (offset < end_offset);
575 return 0;
578 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);