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TOMOYO Linux Cross Reference
Linux/sound/pci/emu10k1/memory.c

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  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 #include <linux/export.h>
 29 
 30 #include <sound/core.h>
 31 #include <sound/emu10k1.h>
 32 
 33 /* page arguments of these two macros are Emu page (4096 bytes), not like
 34  * aligned pages in others
 35  */
 36 #define __set_ptb_entry(emu,page,addr) \
 37         (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << (emu->address_mode)) | (page)))
 38 
 39 #define UNIT_PAGES              (PAGE_SIZE / EMUPAGESIZE)
 40 #define MAX_ALIGN_PAGES0                (MAXPAGES0 / UNIT_PAGES)
 41 #define MAX_ALIGN_PAGES1                (MAXPAGES1 / UNIT_PAGES)
 42 /* get aligned page from offset address */
 43 #define get_aligned_page(offset)        ((offset) >> PAGE_SHIFT)
 44 /* get offset address from aligned page */
 45 #define aligned_page_offset(page)       ((page) << PAGE_SHIFT)
 46 
 47 #if PAGE_SIZE == 4096
 48 /* page size == EMUPAGESIZE */
 49 /* fill PTB entrie(s) corresponding to page with addr */
 50 #define set_ptb_entry(emu,page,addr)    __set_ptb_entry(emu,page,addr)
 51 /* fill PTB entrie(s) corresponding to page with silence pointer */
 52 #define set_silent_ptb(emu,page)        __set_ptb_entry(emu,page,emu->silent_page.addr)
 53 #else
 54 /* fill PTB entries -- we need to fill UNIT_PAGES entries */
 55 static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
 56 {
 57         int i;
 58         page *= UNIT_PAGES;
 59         for (i = 0; i < UNIT_PAGES; i++, page++) {
 60                 __set_ptb_entry(emu, page, addr);
 61                 addr += EMUPAGESIZE;
 62         }
 63 }
 64 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
 65 {
 66         int i;
 67         page *= UNIT_PAGES;
 68         for (i = 0; i < UNIT_PAGES; i++, page++)
 69                 /* do not increment ptr */
 70                 __set_ptb_entry(emu, page, emu->silent_page.addr);
 71 }
 72 #endif /* PAGE_SIZE */
 73 
 74 
 75 /*
 76  */
 77 static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
 78 static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
 79 
 80 #define get_emu10k1_memblk(l,member)    list_entry(l, struct snd_emu10k1_memblk, member)
 81 
 82 
 83 /* initialize emu10k1 part */
 84 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
 85 {
 86         blk->mapped_page = -1;
 87         INIT_LIST_HEAD(&blk->mapped_link);
 88         INIT_LIST_HEAD(&blk->mapped_order_link);
 89         blk->map_locked = 0;
 90 
 91         blk->first_page = get_aligned_page(blk->mem.offset);
 92         blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
 93         blk->pages = blk->last_page - blk->first_page + 1;
 94 }
 95 
 96 /*
 97  * search empty region on PTB with the given size
 98  *
 99  * if an empty region is found, return the page and store the next mapped block
100  * in nextp
101  * if not found, return a negative error code.
102  */
103 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
104 {
105         int page = 0, found_page = -ENOMEM;
106         int max_size = npages;
107         int size;
108         struct list_head *candidate = &emu->mapped_link_head;
109         struct list_head *pos;
110 
111         list_for_each (pos, &emu->mapped_link_head) {
112                 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
113                 if (blk->mapped_page < 0)
114                         continue;
115                 size = blk->mapped_page - page;
116                 if (size == npages) {
117                         *nextp = pos;
118                         return page;
119                 }
120                 else if (size > max_size) {
121                         /* we look for the maximum empty hole */
122                         max_size = size;
123                         candidate = pos;
124                         found_page = page;
125                 }
126                 page = blk->mapped_page + blk->pages;
127         }
128         size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page;
129         if (size >= max_size) {
130                 *nextp = pos;
131                 return page;
132         }
133         *nextp = candidate;
134         return found_page;
135 }
136 
137 /*
138  * map a memory block onto emu10k1's PTB
139  *
140  * call with memblk_lock held
141  */
142 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
143 {
144         int page, pg;
145         struct list_head *next;
146 
147         page = search_empty_map_area(emu, blk->pages, &next);
148         if (page < 0) /* not found */
149                 return page;
150         /* insert this block in the proper position of mapped list */
151         list_add_tail(&blk->mapped_link, next);
152         /* append this as a newest block in order list */
153         list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
154         blk->mapped_page = page;
155         /* fill PTB */
156         for (pg = blk->first_page; pg <= blk->last_page; pg++) {
157                 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
158                 page++;
159         }
160         return 0;
161 }
162 
163 /*
164  * unmap the block
165  * return the size of resultant empty pages
166  *
167  * call with memblk_lock held
168  */
169 static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
170 {
171         int start_page, end_page, mpage, pg;
172         struct list_head *p;
173         struct snd_emu10k1_memblk *q;
174 
175         /* calculate the expected size of empty region */
176         if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) {
177                 q = get_emu10k1_memblk(p, mapped_link);
178                 start_page = q->mapped_page + q->pages;
179         } else
180                 start_page = 0;
181         if ((p = blk->mapped_link.next) != &emu->mapped_link_head) {
182                 q = get_emu10k1_memblk(p, mapped_link);
183                 end_page = q->mapped_page;
184         } else
185                 end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0);
186 
187         /* remove links */
188         list_del(&blk->mapped_link);
189         list_del(&blk->mapped_order_link);
190         /* clear PTB */
191         mpage = blk->mapped_page;
192         for (pg = blk->first_page; pg <= blk->last_page; pg++) {
193                 set_silent_ptb(emu, mpage);
194                 mpage++;
195         }
196         blk->mapped_page = -1;
197         return end_page - start_page; /* return the new empty size */
198 }
199 
200 /*
201  * search empty pages with the given size, and create a memory block
202  *
203  * unlike synth_alloc the memory block is aligned to the page start
204  */
205 static struct snd_emu10k1_memblk *
206 search_empty(struct snd_emu10k1 *emu, int size)
207 {
208         struct list_head *p;
209         struct snd_emu10k1_memblk *blk;
210         int page, psize;
211 
212         psize = get_aligned_page(size + PAGE_SIZE -1);
213         page = 0;
214         list_for_each(p, &emu->memhdr->block) {
215                 blk = get_emu10k1_memblk(p, mem.list);
216                 if (page + psize <= blk->first_page)
217                         goto __found_pages;
218                 page = blk->last_page + 1;
219         }
220         if (page + psize > emu->max_cache_pages)
221                 return NULL;
222 
223 __found_pages:
224         /* create a new memory block */
225         blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
226         if (blk == NULL)
227                 return NULL;
228         blk->mem.offset = aligned_page_offset(page); /* set aligned offset */
229         emu10k1_memblk_init(blk);
230         return blk;
231 }
232 
233 
234 /*
235  * check if the given pointer is valid for pages
236  */
237 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
238 {
239         if (addr & ~emu->dma_mask) {
240                 dev_err(emu->card->dev,
241                         "max memory size is 0x%lx (addr = 0x%lx)!!\n",
242                         emu->dma_mask, (unsigned long)addr);
243                 return 0;
244         }
245         if (addr & (EMUPAGESIZE-1)) {
246                 dev_err(emu->card->dev, "page is not aligned\n");
247                 return 0;
248         }
249         return 1;
250 }
251 
252 /*
253  * map the given memory block on PTB.
254  * if the block is already mapped, update the link order.
255  * if no empty pages are found, tries to release unused memory blocks
256  * and retry the mapping.
257  */
258 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
259 {
260         int err;
261         int size;
262         struct list_head *p, *nextp;
263         struct snd_emu10k1_memblk *deleted;
264         unsigned long flags;
265 
266         spin_lock_irqsave(&emu->memblk_lock, flags);
267         if (blk->mapped_page >= 0) {
268                 /* update order link */
269                 list_move_tail(&blk->mapped_order_link,
270                                &emu->mapped_order_link_head);
271                 spin_unlock_irqrestore(&emu->memblk_lock, flags);
272                 return 0;
273         }
274         if ((err = map_memblk(emu, blk)) < 0) {
275                 /* no enough page - try to unmap some blocks */
276                 /* starting from the oldest block */
277                 p = emu->mapped_order_link_head.next;
278                 for (; p != &emu->mapped_order_link_head; p = nextp) {
279                         nextp = p->next;
280                         deleted = get_emu10k1_memblk(p, mapped_order_link);
281                         if (deleted->map_locked)
282                                 continue;
283                         size = unmap_memblk(emu, deleted);
284                         if (size >= blk->pages) {
285                                 /* ok the empty region is enough large */
286                                 err = map_memblk(emu, blk);
287                                 break;
288                         }
289                 }
290         }
291         spin_unlock_irqrestore(&emu->memblk_lock, flags);
292         return err;
293 }
294 
295 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
296 
297 /*
298  * page allocation for DMA
299  */
300 struct snd_util_memblk *
301 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
302 {
303         struct snd_pcm_runtime *runtime = substream->runtime;
304         struct snd_util_memhdr *hdr;
305         struct snd_emu10k1_memblk *blk;
306         int page, err, idx;
307 
308         if (snd_BUG_ON(!emu))
309                 return NULL;
310         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
311                        runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE))
312                 return NULL;
313         hdr = emu->memhdr;
314         if (snd_BUG_ON(!hdr))
315                 return NULL;
316 
317         idx = runtime->period_size >= runtime->buffer_size ?
318                                         (emu->delay_pcm_irq * 2) : 0;
319         mutex_lock(&hdr->block_mutex);
320         blk = search_empty(emu, runtime->dma_bytes + idx);
321         if (blk == NULL) {
322                 mutex_unlock(&hdr->block_mutex);
323                 return NULL;
324         }
325         /* fill buffer addresses but pointers are not stored so that
326          * snd_free_pci_page() is not called in in synth_free()
327          */
328         idx = 0;
329         for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
330                 unsigned long ofs = idx << PAGE_SHIFT;
331                 dma_addr_t addr;
332                 if (ofs >= runtime->dma_bytes)
333                         addr = emu->silent_page.addr;
334                 else
335                         addr = snd_pcm_sgbuf_get_addr(substream, ofs);
336                 if (! is_valid_page(emu, addr)) {
337                         dev_err(emu->card->dev,
338                                 "emu: failure page = %d\n", idx);
339                         mutex_unlock(&hdr->block_mutex);
340                         return NULL;
341                 }
342                 emu->page_addr_table[page] = addr;
343                 emu->page_ptr_table[page] = NULL;
344         }
345 
346         /* set PTB entries */
347         blk->map_locked = 1; /* do not unmap this block! */
348         err = snd_emu10k1_memblk_map(emu, blk);
349         if (err < 0) {
350                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
351                 mutex_unlock(&hdr->block_mutex);
352                 return NULL;
353         }
354         mutex_unlock(&hdr->block_mutex);
355         return (struct snd_util_memblk *)blk;
356 }
357 
358 
359 /*
360  * release DMA buffer from page table
361  */
362 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
363 {
364         if (snd_BUG_ON(!emu || !blk))
365                 return -EINVAL;
366         return snd_emu10k1_synth_free(emu, blk);
367 }
368 
369 
370 /*
371  * memory allocation using multiple pages (for synth)
372  * Unlike the DMA allocation above, non-contiguous pages are assined.
373  */
374 
375 /*
376  * allocate a synth sample area
377  */
378 struct snd_util_memblk *
379 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
380 {
381         struct snd_emu10k1_memblk *blk;
382         struct snd_util_memhdr *hdr = hw->memhdr; 
383 
384         mutex_lock(&hdr->block_mutex);
385         blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
386         if (blk == NULL) {
387                 mutex_unlock(&hdr->block_mutex);
388                 return NULL;
389         }
390         if (synth_alloc_pages(hw, blk)) {
391                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
392                 mutex_unlock(&hdr->block_mutex);
393                 return NULL;
394         }
395         snd_emu10k1_memblk_map(hw, blk);
396         mutex_unlock(&hdr->block_mutex);
397         return (struct snd_util_memblk *)blk;
398 }
399 
400 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
401 
402 /*
403  * free a synth sample area
404  */
405 int
406 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
407 {
408         struct snd_util_memhdr *hdr = emu->memhdr; 
409         struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
410         unsigned long flags;
411 
412         mutex_lock(&hdr->block_mutex);
413         spin_lock_irqsave(&emu->memblk_lock, flags);
414         if (blk->mapped_page >= 0)
415                 unmap_memblk(emu, blk);
416         spin_unlock_irqrestore(&emu->memblk_lock, flags);
417         synth_free_pages(emu, blk);
418          __snd_util_mem_free(hdr, memblk);
419         mutex_unlock(&hdr->block_mutex);
420         return 0;
421 }
422 
423 EXPORT_SYMBOL(snd_emu10k1_synth_free);
424 
425 /* check new allocation range */
426 static void get_single_page_range(struct snd_util_memhdr *hdr,
427                                   struct snd_emu10k1_memblk *blk,
428                                   int *first_page_ret, int *last_page_ret)
429 {
430         struct list_head *p;
431         struct snd_emu10k1_memblk *q;
432         int first_page, last_page;
433         first_page = blk->first_page;
434         if ((p = blk->mem.list.prev) != &hdr->block) {
435                 q = get_emu10k1_memblk(p, mem.list);
436                 if (q->last_page == first_page)
437                         first_page++;  /* first page was already allocated */
438         }
439         last_page = blk->last_page;
440         if ((p = blk->mem.list.next) != &hdr->block) {
441                 q = get_emu10k1_memblk(p, mem.list);
442                 if (q->first_page == last_page)
443                         last_page--; /* last page was already allocated */
444         }
445         *first_page_ret = first_page;
446         *last_page_ret = last_page;
447 }
448 
449 /* release allocated pages */
450 static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
451                                int last_page)
452 {
453         int page;
454 
455         for (page = first_page; page <= last_page; page++) {
456                 free_page((unsigned long)emu->page_ptr_table[page]);
457                 emu->page_addr_table[page] = 0;
458                 emu->page_ptr_table[page] = NULL;
459         }
460 }
461 
462 /*
463  * allocate kernel pages
464  */
465 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
466 {
467         int page, first_page, last_page;
468 
469         emu10k1_memblk_init(blk);
470         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
471         /* allocate kernel pages */
472         for (page = first_page; page <= last_page; page++) {
473                 /* first try to allocate from <4GB zone */
474                 struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
475                                             __GFP_NOWARN);
476                 if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
477                         if (p)
478                                 __free_page(p);
479                         /* try to allocate from <16MB zone */
480                         p = alloc_page(GFP_ATOMIC | GFP_DMA |
481                                        __GFP_NORETRY | /* no OOM-killer */
482                                        __GFP_NOWARN);
483                 }
484                 if (!p) {
485                         __synth_free_pages(emu, first_page, page - 1);
486                         return -ENOMEM;
487                 }
488                 emu->page_addr_table[page] = page_to_phys(p);
489                 emu->page_ptr_table[page] = page_address(p);
490         }
491         return 0;
492 }
493 
494 /*
495  * free pages
496  */
497 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
498 {
499         int first_page, last_page;
500 
501         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
502         __synth_free_pages(emu, first_page, last_page);
503         return 0;
504 }
505 
506 /* calculate buffer pointer from offset address */
507 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
508 {
509         char *ptr;
510         if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
511                 return NULL;
512         ptr = emu->page_ptr_table[page];
513         if (! ptr) {
514                 dev_err(emu->card->dev,
515                         "access to NULL ptr: page = %d\n", page);
516                 return NULL;
517         }
518         ptr += offset & (PAGE_SIZE - 1);
519         return (void*)ptr;
520 }
521 
522 /*
523  * bzero(blk + offset, size)
524  */
525 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
526                             int offset, int size)
527 {
528         int page, nextofs, end_offset, temp, temp1;
529         void *ptr;
530         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
531 
532         offset += blk->offset & (PAGE_SIZE - 1);
533         end_offset = offset + size;
534         page = get_aligned_page(offset);
535         do {
536                 nextofs = aligned_page_offset(page + 1);
537                 temp = nextofs - offset;
538                 temp1 = end_offset - offset;
539                 if (temp1 < temp)
540                         temp = temp1;
541                 ptr = offset_ptr(emu, page + p->first_page, offset);
542                 if (ptr)
543                         memset(ptr, 0, temp);
544                 offset = nextofs;
545                 page++;
546         } while (offset < end_offset);
547         return 0;
548 }
549 
550 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
551 
552 /*
553  * copy_from_user(blk + offset, data, size)
554  */
555 int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
556                                      int offset, const char __user *data, int size)
557 {
558         int page, nextofs, end_offset, temp, temp1;
559         void *ptr;
560         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
561 
562         offset += blk->offset & (PAGE_SIZE - 1);
563         end_offset = offset + size;
564         page = get_aligned_page(offset);
565         do {
566                 nextofs = aligned_page_offset(page + 1);
567                 temp = nextofs - offset;
568                 temp1 = end_offset - offset;
569                 if (temp1 < temp)
570                         temp = temp1;
571                 ptr = offset_ptr(emu, page + p->first_page, offset);
572                 if (ptr && copy_from_user(ptr, data, temp))
573                         return -EFAULT;
574                 offset = nextofs;
575                 data += temp;
576                 page++;
577         } while (offset < end_offset);
578         return 0;
579 }
580 
581 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);
582 

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