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9#include <linux/pci.h>
10#include <linux/gfp.h>
11#include <linux/time.h>
12#include <linux/mutex.h>
13#include <linux/export.h>
14
15#include <sound/core.h>
16#include <sound/emu10k1.h>
17
18
19
20
21#define __set_ptb_entry(emu,page,addr) \
22 (((__le32 *)(emu)->ptb_pages.area)[page] = \
23 cpu_to_le32(((addr) << (emu->address_mode)) | (page)))
24#define __get_ptb_entry(emu, page) \
25 (le32_to_cpu(((__le32 *)(emu)->ptb_pages.area)[page]))
26
27#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
28#define MAX_ALIGN_PAGES0 (MAXPAGES0 / UNIT_PAGES)
29#define MAX_ALIGN_PAGES1 (MAXPAGES1 / UNIT_PAGES)
30
31#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
32
33#define aligned_page_offset(page) ((page) << PAGE_SHIFT)
34
35#if PAGE_SIZE == EMUPAGESIZE && !IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
36
37#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
38
39#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
40#else
41
42static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
43{
44 int i;
45 page *= UNIT_PAGES;
46 for (i = 0; i < UNIT_PAGES; i++, page++) {
47 __set_ptb_entry(emu, page, addr);
48 dev_dbg(emu->card->dev, "mapped page %d to entry %.8x\n", page,
49 (unsigned int)__get_ptb_entry(emu, page));
50 addr += EMUPAGESIZE;
51 }
52}
53static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
54{
55 int i;
56 page *= UNIT_PAGES;
57 for (i = 0; i < UNIT_PAGES; i++, page++) {
58
59 __set_ptb_entry(emu, page, emu->silent_page.addr);
60 dev_dbg(emu->card->dev, "mapped silent page %d to entry %.8x\n",
61 page, (unsigned int)__get_ptb_entry(emu, page));
62 }
63}
64#endif
65
66
67
68
69static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
70static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
71
72#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
73
74
75
76static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
77{
78 blk->mapped_page = -1;
79 INIT_LIST_HEAD(&blk->mapped_link);
80 INIT_LIST_HEAD(&blk->mapped_order_link);
81 blk->map_locked = 0;
82
83 blk->first_page = get_aligned_page(blk->mem.offset);
84 blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
85 blk->pages = blk->last_page - blk->first_page + 1;
86}
87
88
89
90
91
92
93
94
95static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
96{
97 int page = 1, found_page = -ENOMEM;
98 int max_size = npages;
99 int size;
100 struct list_head *candidate = &emu->mapped_link_head;
101 struct list_head *pos;
102
103 list_for_each (pos, &emu->mapped_link_head) {
104 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
105 if (blk->mapped_page < 0)
106 continue;
107 size = blk->mapped_page - page;
108 if (size == npages) {
109 *nextp = pos;
110 return page;
111 }
112 else if (size > max_size) {
113
114 max_size = size;
115 candidate = pos;
116 found_page = page;
117 }
118 page = blk->mapped_page + blk->pages;
119 }
120 size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page;
121 if (size >= max_size) {
122 *nextp = pos;
123 return page;
124 }
125 *nextp = candidate;
126 return found_page;
127}
128
129
130
131
132
133
134static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
135{
136 int page, pg;
137 struct list_head *next;
138
139 page = search_empty_map_area(emu, blk->pages, &next);
140 if (page < 0)
141 return page;
142 if (page == 0) {
143 dev_err(emu->card->dev, "trying to map zero (reserved) page\n");
144 return -EINVAL;
145 }
146
147 list_add_tail(&blk->mapped_link, next);
148
149 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
150 blk->mapped_page = page;
151
152 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
153 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
154 page++;
155 }
156 return 0;
157}
158
159
160
161
162
163
164
165static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
166{
167 int start_page, end_page, mpage, pg;
168 struct list_head *p;
169 struct snd_emu10k1_memblk *q;
170
171
172 p = blk->mapped_link.prev;
173 if (p != &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 = 1;
178 }
179 p = blk->mapped_link.next;
180 if (p != &emu->mapped_link_head) {
181 q = get_emu10k1_memblk(p, mapped_link);
182 end_page = q->mapped_page;
183 } else {
184 end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0);
185 }
186
187
188 list_del(&blk->mapped_link);
189 list_del(&blk->mapped_order_link);
190
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;
198}
199
200
201
202
203
204
205static struct snd_emu10k1_memblk *
206search_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
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);
229 emu10k1_memblk_init(blk);
230 return blk;
231}
232
233
234
235
236
237static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
238{
239 if (addr & ~emu->dma_mask) {
240 dev_err_ratelimited(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_ratelimited(emu->card->dev, "page is not aligned\n");
247 return 0;
248 }
249 return 1;
250}
251
252
253
254
255
256
257
258int 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
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 err = map_memblk(emu, blk);
275 if (err < 0) {
276
277
278 p = emu->mapped_order_link_head.next;
279 for (; p != &emu->mapped_order_link_head; p = nextp) {
280 nextp = p->next;
281 deleted = get_emu10k1_memblk(p, mapped_order_link);
282 if (deleted->map_locked)
283 continue;
284 size = unmap_memblk(emu, deleted);
285 if (size >= blk->pages) {
286
287 err = map_memblk(emu, blk);
288 break;
289 }
290 }
291 }
292 spin_unlock_irqrestore(&emu->memblk_lock, flags);
293 return err;
294}
295
296EXPORT_SYMBOL(snd_emu10k1_memblk_map);
297
298
299
300
301struct snd_util_memblk *
302snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
303{
304 struct snd_pcm_runtime *runtime = substream->runtime;
305 struct snd_util_memhdr *hdr;
306 struct snd_emu10k1_memblk *blk;
307 int page, err, idx;
308
309 if (snd_BUG_ON(!emu))
310 return NULL;
311 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
312 runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE))
313 return NULL;
314 hdr = emu->memhdr;
315 if (snd_BUG_ON(!hdr))
316 return NULL;
317
318 idx = runtime->period_size >= runtime->buffer_size ?
319 (emu->delay_pcm_irq * 2) : 0;
320 mutex_lock(&hdr->block_mutex);
321 blk = search_empty(emu, runtime->dma_bytes + idx);
322 if (blk == NULL) {
323 mutex_unlock(&hdr->block_mutex);
324 return NULL;
325 }
326
327
328
329 idx = 0;
330 for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
331 unsigned long ofs = idx << PAGE_SHIFT;
332 dma_addr_t addr;
333 if (ofs >= runtime->dma_bytes)
334 addr = emu->silent_page.addr;
335 else
336 addr = snd_pcm_sgbuf_get_addr(substream, ofs);
337 if (! is_valid_page(emu, addr)) {
338 dev_err_ratelimited(emu->card->dev,
339 "emu: failure page = %d\n", idx);
340 mutex_unlock(&hdr->block_mutex);
341 return NULL;
342 }
343 emu->page_addr_table[page] = addr;
344 emu->page_ptr_table[page] = NULL;
345 }
346
347
348 blk->map_locked = 1;
349 err = snd_emu10k1_memblk_map(emu, blk);
350 if (err < 0) {
351 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
352 mutex_unlock(&hdr->block_mutex);
353 return NULL;
354 }
355 mutex_unlock(&hdr->block_mutex);
356 return (struct snd_util_memblk *)blk;
357}
358
359
360
361
362
363int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
364{
365 if (snd_BUG_ON(!emu || !blk))
366 return -EINVAL;
367 return snd_emu10k1_synth_free(emu, blk);
368}
369
370
371
372
373
374
375
376
377
378
379int snd_emu10k1_alloc_pages_maybe_wider(struct snd_emu10k1 *emu, size_t size,
380 struct snd_dma_buffer *dmab)
381{
382 if (emu->iommu_workaround) {
383 size_t npages = DIV_ROUND_UP(size, PAGE_SIZE);
384 size_t size_real = npages * PAGE_SIZE;
385
386
387
388
389
390 if (size_real < size + 1024)
391 size += PAGE_SIZE;
392 }
393
394 return snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
395 &emu->pci->dev, size, dmab);
396}
397
398
399
400
401
402
403
404
405
406struct snd_util_memblk *
407snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
408{
409 struct snd_emu10k1_memblk *blk;
410 struct snd_util_memhdr *hdr = hw->memhdr;
411
412 mutex_lock(&hdr->block_mutex);
413 blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
414 if (blk == NULL) {
415 mutex_unlock(&hdr->block_mutex);
416 return NULL;
417 }
418 if (synth_alloc_pages(hw, blk)) {
419 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
420 mutex_unlock(&hdr->block_mutex);
421 return NULL;
422 }
423 snd_emu10k1_memblk_map(hw, blk);
424 mutex_unlock(&hdr->block_mutex);
425 return (struct snd_util_memblk *)blk;
426}
427
428EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
429
430
431
432
433int
434snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
435{
436 struct snd_util_memhdr *hdr = emu->memhdr;
437 struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
438 unsigned long flags;
439
440 mutex_lock(&hdr->block_mutex);
441 spin_lock_irqsave(&emu->memblk_lock, flags);
442 if (blk->mapped_page >= 0)
443 unmap_memblk(emu, blk);
444 spin_unlock_irqrestore(&emu->memblk_lock, flags);
445 synth_free_pages(emu, blk);
446 __snd_util_mem_free(hdr, memblk);
447 mutex_unlock(&hdr->block_mutex);
448 return 0;
449}
450
451EXPORT_SYMBOL(snd_emu10k1_synth_free);
452
453
454static void get_single_page_range(struct snd_util_memhdr *hdr,
455 struct snd_emu10k1_memblk *blk,
456 int *first_page_ret, int *last_page_ret)
457{
458 struct list_head *p;
459 struct snd_emu10k1_memblk *q;
460 int first_page, last_page;
461 first_page = blk->first_page;
462 p = blk->mem.list.prev;
463 if (p != &hdr->block) {
464 q = get_emu10k1_memblk(p, mem.list);
465 if (q->last_page == first_page)
466 first_page++;
467 }
468 last_page = blk->last_page;
469 p = blk->mem.list.next;
470 if (p != &hdr->block) {
471 q = get_emu10k1_memblk(p, mem.list);
472 if (q->first_page == last_page)
473 last_page--;
474 }
475 *first_page_ret = first_page;
476 *last_page_ret = last_page;
477}
478
479
480static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
481 int last_page)
482{
483 struct snd_dma_buffer dmab;
484 int page;
485
486 dmab.dev.type = SNDRV_DMA_TYPE_DEV;
487 dmab.dev.dev = &emu->pci->dev;
488
489 for (page = first_page; page <= last_page; page++) {
490 if (emu->page_ptr_table[page] == NULL)
491 continue;
492 dmab.area = emu->page_ptr_table[page];
493 dmab.addr = emu->page_addr_table[page];
494
495
496
497
498
499 dmab.bytes = PAGE_SIZE;
500 if (emu->iommu_workaround)
501 dmab.bytes *= 2;
502
503 snd_dma_free_pages(&dmab);
504 emu->page_addr_table[page] = 0;
505 emu->page_ptr_table[page] = NULL;
506 }
507}
508
509
510
511
512static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
513{
514 int page, first_page, last_page;
515 struct snd_dma_buffer dmab;
516
517 emu10k1_memblk_init(blk);
518 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
519
520 for (page = first_page; page <= last_page; page++) {
521 if (snd_emu10k1_alloc_pages_maybe_wider(emu, PAGE_SIZE,
522 &dmab) < 0)
523 goto __fail;
524 if (!is_valid_page(emu, dmab.addr)) {
525 snd_dma_free_pages(&dmab);
526 goto __fail;
527 }
528 emu->page_addr_table[page] = dmab.addr;
529 emu->page_ptr_table[page] = dmab.area;
530 }
531 return 0;
532
533__fail:
534
535 last_page = page - 1;
536 __synth_free_pages(emu, first_page, last_page);
537
538 return -ENOMEM;
539}
540
541
542
543
544static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
545{
546 int first_page, last_page;
547
548 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
549 __synth_free_pages(emu, first_page, last_page);
550 return 0;
551}
552
553
554static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
555{
556 char *ptr;
557 if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
558 return NULL;
559 ptr = emu->page_ptr_table[page];
560 if (! ptr) {
561 dev_err(emu->card->dev,
562 "access to NULL ptr: page = %d\n", page);
563 return NULL;
564 }
565 ptr += offset & (PAGE_SIZE - 1);
566 return (void*)ptr;
567}
568
569
570
571
572int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
573 int offset, int size)
574{
575 int page, nextofs, end_offset, temp, temp1;
576 void *ptr;
577 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
578
579 offset += blk->offset & (PAGE_SIZE - 1);
580 end_offset = offset + size;
581 page = get_aligned_page(offset);
582 do {
583 nextofs = aligned_page_offset(page + 1);
584 temp = nextofs - offset;
585 temp1 = end_offset - offset;
586 if (temp1 < temp)
587 temp = temp1;
588 ptr = offset_ptr(emu, page + p->first_page, offset);
589 if (ptr)
590 memset(ptr, 0, temp);
591 offset = nextofs;
592 page++;
593 } while (offset < end_offset);
594 return 0;
595}
596
597EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
598
599
600
601
602int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
603 int offset, const char __user *data, int size)
604{
605 int page, nextofs, end_offset, temp, temp1;
606 void *ptr;
607 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
608
609 offset += blk->offset & (PAGE_SIZE - 1);
610 end_offset = offset + size;
611 page = get_aligned_page(offset);
612 do {
613 nextofs = aligned_page_offset(page + 1);
614 temp = nextofs - offset;
615 temp1 = end_offset - offset;
616 if (temp1 < temp)
617 temp = temp1;
618 ptr = offset_ptr(emu, page + p->first_page, offset);
619 if (ptr && copy_from_user(ptr, data, temp))
620 return -EFAULT;
621 offset = nextofs;
622 data += temp;
623 page++;
624 } while (offset < end_offset);
625 return 0;
626}
627
628EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);
629