1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24#include <linux/pci.h>
25#include <linux/time.h>
26#include <linux/mutex.h>
27
28#include <sound/core.h>
29#include <sound/emu10k1.h>
30
31
32
33
34#define __set_ptb_entry(emu,page,addr) \
35 (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page)))
36
37#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE)
38#define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES)
39
40#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT)
41
42#define aligned_page_offset(page) ((page) << PAGE_SHIFT)
43
44#if PAGE_SIZE == 4096
45
46
47#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr)
48
49#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr)
50#else
51
52static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
53{
54 int i;
55 page *= UNIT_PAGES;
56 for (i = 0; i < UNIT_PAGES; i++, page++) {
57 __set_ptb_entry(emu, page, addr);
58 addr += EMUPAGESIZE;
59 }
60}
61static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
62{
63 int i;
64 page *= UNIT_PAGES;
65 for (i = 0; i < UNIT_PAGES; i++, page++)
66
67 __set_ptb_entry(emu, page, emu->silent_page.addr);
68}
69#endif
70
71
72
73
74static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
75static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
76
77#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member)
78
79
80
81static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
82{
83 blk->mapped_page = -1;
84 INIT_LIST_HEAD(&blk->mapped_link);
85 INIT_LIST_HEAD(&blk->mapped_order_link);
86 blk->map_locked = 0;
87
88 blk->first_page = get_aligned_page(blk->mem.offset);
89 blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
90 blk->pages = blk->last_page - blk->first_page + 1;
91}
92
93
94
95
96
97
98
99
100static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
101{
102 int page = 0, found_page = -ENOMEM;
103 int max_size = npages;
104 int size;
105 struct list_head *candidate = &emu->mapped_link_head;
106 struct list_head *pos;
107
108 list_for_each (pos, &emu->mapped_link_head) {
109 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
110 if (blk->mapped_page < 0)
111 continue;
112 size = blk->mapped_page - page;
113 if (size == npages) {
114 *nextp = pos;
115 return page;
116 }
117 else if (size > max_size) {
118
119 max_size = size;
120 candidate = pos;
121 found_page = page;
122 }
123 page = blk->mapped_page + blk->pages;
124 }
125 size = MAX_ALIGN_PAGES - page;
126 if (size >= max_size) {
127 *nextp = pos;
128 return page;
129 }
130 *nextp = candidate;
131 return found_page;
132}
133
134
135
136
137
138
139static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
140{
141 int page, pg;
142 struct list_head *next;
143
144 page = search_empty_map_area(emu, blk->pages, &next);
145 if (page < 0)
146 return page;
147
148 list_add_tail(&blk->mapped_link, next);
149
150 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head);
151 blk->mapped_page = page;
152
153 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
154 set_ptb_entry(emu, page, emu->page_addr_table[pg]);
155 page++;
156 }
157 return 0;
158}
159
160
161
162
163
164
165
166static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
167{
168 int start_page, end_page, mpage, pg;
169 struct list_head *p;
170 struct snd_emu10k1_memblk *q;
171
172
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;
183
184
185 list_del(&blk->mapped_link);
186 list_del(&blk->mapped_order_link);
187
188 mpage = blk->mapped_page;
189 for (pg = blk->first_page; pg <= blk->last_page; pg++) {
190 set_silent_ptb(emu, mpage);
191 mpage++;
192 }
193 blk->mapped_page = -1;
194 return end_page - start_page;
195}
196
197
198
199
200
201
202static struct snd_emu10k1_memblk *
203search_empty(struct snd_emu10k1 *emu, int size)
204{
205 struct list_head *p;
206 struct snd_emu10k1_memblk *blk;
207 int page, psize;
208
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;
216 }
217 if (page + psize > emu->max_cache_pages)
218 return NULL;
219
220__found_pages:
221
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);
226 emu10k1_memblk_init(blk);
227 return blk;
228}
229
230
231
232
233
234static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
235{
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;
239 }
240 if (addr & (EMUPAGESIZE-1)) {
241 snd_printk(KERN_ERR "page is not aligned\n");
242 return 0;
243 }
244 return 1;
245}
246
247
248
249
250
251
252
253int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
254{
255 int err;
256 int size;
257 struct list_head *p, *nextp;
258 struct snd_emu10k1_memblk *deleted;
259 unsigned long flags;
260
261 spin_lock_irqsave(&emu->memblk_lock, flags);
262 if (blk->mapped_page >= 0) {
263
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;
268 }
269 if ((err = map_memblk(emu, blk)) < 0) {
270
271
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
281 err = map_memblk(emu, blk);
282 break;
283 }
284 }
285 }
286 spin_unlock_irqrestore(&emu->memblk_lock, flags);
287 return err;
288}
289
290EXPORT_SYMBOL(snd_emu10k1_memblk_map);
291
292
293
294
295struct snd_util_memblk *
296snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
297{
298 struct snd_pcm_runtime *runtime = substream->runtime;
299 struct snd_util_memhdr *hdr;
300 struct snd_emu10k1_memblk *blk;
301 int page, err, idx;
302
303 if (snd_BUG_ON(!emu))
304 return NULL;
305 if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
306 runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE))
307 return NULL;
308 hdr = emu->memhdr;
309 if (snd_BUG_ON(!hdr))
310 return NULL;
311
312 mutex_lock(&hdr->block_mutex);
313 blk = search_empty(emu, runtime->dma_bytes);
314 if (blk == NULL) {
315 mutex_unlock(&hdr->block_mutex);
316 return NULL;
317 }
318
319
320
321 idx = 0;
322 for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
323 unsigned long ofs = idx << PAGE_SHIFT;
324 dma_addr_t addr;
325 addr = snd_pcm_sgbuf_get_addr(substream, ofs);
326 if (! is_valid_page(emu, addr)) {
327 printk(KERN_ERR "emu: failure page = %d\n", idx);
328 mutex_unlock(&hdr->block_mutex);
329 return NULL;
330 }
331 emu->page_addr_table[page] = addr;
332 emu->page_ptr_table[page] = NULL;
333 }
334
335
336 blk->map_locked = 1;
337 err = snd_emu10k1_memblk_map(emu, blk);
338 if (err < 0) {
339 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
340 mutex_unlock(&hdr->block_mutex);
341 return NULL;
342 }
343 mutex_unlock(&hdr->block_mutex);
344 return (struct snd_util_memblk *)blk;
345}
346
347
348
349
350
351int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
352{
353 if (snd_BUG_ON(!emu || !blk))
354 return -EINVAL;
355 return snd_emu10k1_synth_free(emu, blk);
356}
357
358
359
360
361
362
363
364
365
366
367struct snd_util_memblk *
368snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
369{
370 struct snd_emu10k1_memblk *blk;
371 struct snd_util_memhdr *hdr = hw->memhdr;
372
373 mutex_lock(&hdr->block_mutex);
374 blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
375 if (blk == NULL) {
376 mutex_unlock(&hdr->block_mutex);
377 return NULL;
378 }
379 if (synth_alloc_pages(hw, blk)) {
380 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
381 mutex_unlock(&hdr->block_mutex);
382 return NULL;
383 }
384 snd_emu10k1_memblk_map(hw, blk);
385 mutex_unlock(&hdr->block_mutex);
386 return (struct snd_util_memblk *)blk;
387}
388
389EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
390
391
392
393
394int
395snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
396{
397 struct snd_util_memhdr *hdr = emu->memhdr;
398 struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
399 unsigned long flags;
400
401 mutex_lock(&hdr->block_mutex);
402 spin_lock_irqsave(&emu->memblk_lock, flags);
403 if (blk->mapped_page >= 0)
404 unmap_memblk(emu, blk);
405 spin_unlock_irqrestore(&emu->memblk_lock, flags);
406 synth_free_pages(emu, blk);
407 __snd_util_mem_free(hdr, memblk);
408 mutex_unlock(&hdr->block_mutex);
409 return 0;
410}
411
412EXPORT_SYMBOL(snd_emu10k1_synth_free);
413
414
415static void get_single_page_range(struct snd_util_memhdr *hdr,
416 struct snd_emu10k1_memblk *blk,
417 int *first_page_ret, int *last_page_ret)
418{
419 struct list_head *p;
420 struct snd_emu10k1_memblk *q;
421 int first_page, last_page;
422 first_page = blk->first_page;
423 if ((p = blk->mem.list.prev) != &hdr->block) {
424 q = get_emu10k1_memblk(p, mem.list);
425 if (q->last_page == first_page)
426 first_page++;
427 }
428 last_page = blk->last_page;
429 if ((p = blk->mem.list.next) != &hdr->block) {
430 q = get_emu10k1_memblk(p, mem.list);
431 if (q->first_page == last_page)
432 last_page--;
433 }
434 *first_page_ret = first_page;
435 *last_page_ret = last_page;
436}
437
438
439static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
440 int last_page)
441{
442 int page;
443
444 for (page = first_page; page <= last_page; page++) {
445 free_page((unsigned long)emu->page_ptr_table[page]);
446 emu->page_addr_table[page] = 0;
447 emu->page_ptr_table[page] = NULL;
448 }
449}
450
451
452
453
454static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
455{
456 int page, first_page, last_page;
457
458 emu10k1_memblk_init(blk);
459 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
460
461 for (page = first_page; page <= last_page; page++) {
462
463 struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
464 __GFP_NOWARN);
465 if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
466 if (p)
467 __free_page(p);
468
469 p = alloc_page(GFP_ATOMIC | GFP_DMA |
470 __GFP_NORETRY |
471 __GFP_NOWARN);
472 }
473 if (!p) {
474 __synth_free_pages(emu, first_page, page - 1);
475 return -ENOMEM;
476 }
477 emu->page_addr_table[page] = page_to_phys(p);
478 emu->page_ptr_table[page] = page_address(p);
479 }
480 return 0;
481}
482
483
484
485
486static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
487{
488 int first_page, last_page;
489
490 get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
491 __synth_free_pages(emu, first_page, last_page);
492 return 0;
493}
494
495
496static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
497{
498 char *ptr;
499 if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
500 return NULL;
501 ptr = emu->page_ptr_table[page];
502 if (! ptr) {
503 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
504 return NULL;
505 }
506 ptr += offset & (PAGE_SIZE - 1);
507 return (void*)ptr;
508}
509
510
511
512
513int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
514 int offset, int size)
515{
516 int page, nextofs, end_offset, temp, temp1;
517 void *ptr;
518 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
519
520 offset += blk->offset & (PAGE_SIZE - 1);
521 end_offset = offset + size;
522 page = get_aligned_page(offset);
523 do {
524 nextofs = aligned_page_offset(page + 1);
525 temp = nextofs - offset;
526 temp1 = end_offset - offset;
527 if (temp1 < temp)
528 temp = temp1;
529 ptr = offset_ptr(emu, page + p->first_page, offset);
530 if (ptr)
531 memset(ptr, 0, temp);
532 offset = nextofs;
533 page++;
534 } while (offset < end_offset);
535 return 0;
536}
537
538EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
539
540
541
542
543int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
544 int offset, const char __user *data, int size)
545{
546 int page, nextofs, end_offset, temp, temp1;
547 void *ptr;
548 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
549
550 offset += blk->offset & (PAGE_SIZE - 1);
551 end_offset = offset + size;
552 page = get_aligned_page(offset);
553 do {
554 nextofs = aligned_page_offset(page + 1);
555 temp = nextofs - offset;
556 temp1 = end_offset - offset;
557 if (temp1 < temp)
558 temp = temp1;
559 ptr = offset_ptr(emu, page + p->first_page, offset);
560 if (ptr && copy_from_user(ptr, data, temp))
561 return -EFAULT;
562 offset = nextofs;
563 data += temp;
564 page++;
565 } while (offset < end_offset);
566 return 0;
567}
568
569EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);
570