1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
4 | * Copyright (c) by Takashi Iwai <tiwai@suse.de> |
5 | * |
6 | * EMU10K1 memory page allocation (PTB area) |
7 | */ |
8 | |
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 | /* page arguments of these two macros are Emu page (4096 bytes), not like |
19 | * aligned pages in others |
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 | /* get aligned page from offset address */ |
31 | #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) |
32 | /* get offset address from aligned page */ |
33 | #define aligned_page_offset(page) ((page) << PAGE_SHIFT) |
34 | |
35 | #if PAGE_SIZE == EMUPAGESIZE && !IS_ENABLED(CONFIG_DYNAMIC_DEBUG) |
36 | /* fill PTB entrie(s) corresponding to page with addr */ |
37 | #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) |
38 | /* fill PTB entrie(s) corresponding to page with silence pointer */ |
39 | #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) |
40 | #else |
41 | /* fill PTB entries -- we need to fill UNIT_PAGES entries */ |
42 | static 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 | } |
53 | static 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 | /* do not increment ptr */ |
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 /* PAGE_SIZE */ |
65 | |
66 | |
67 | /* |
68 | */ |
69 | static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); |
70 | static 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 | /* initialize emu10k1 part */ |
76 | static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) |
77 | { |
78 | blk->mapped_page = -1; |
79 | INIT_LIST_HEAD(list: &blk->mapped_link); |
80 | INIT_LIST_HEAD(list: &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 | * search empty region on PTB with the given size |
90 | * |
91 | * if an empty region is found, return the page and store the next mapped block |
92 | * in nextp |
93 | * if not found, return a negative error code. |
94 | */ |
95 | static 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 | /* we look for the maximum empty hole */ |
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 | * map a memory block onto emu10k1's PTB |
131 | * |
132 | * call with memblk_lock held |
133 | */ |
134 | static 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, npages: blk->pages, nextp: &next); |
140 | if (page < 0) /* not found */ |
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 | /* insert this block in the proper position of mapped list */ |
147 | list_add_tail(new: &blk->mapped_link, head: next); |
148 | /* append this as a newest block in order list */ |
149 | list_add_tail(new: &blk->mapped_order_link, head: &emu->mapped_order_link_head); |
150 | blk->mapped_page = page; |
151 | /* fill PTB */ |
152 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { |
153 | set_ptb_entry(emu, page, addr: emu->page_addr_table[pg]); |
154 | page++; |
155 | } |
156 | return 0; |
157 | } |
158 | |
159 | /* |
160 | * unmap the block |
161 | * return the size of resultant empty pages |
162 | * |
163 | * call with memblk_lock held |
164 | */ |
165 | static 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 | /* calculate the expected size of empty region */ |
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 | /* remove links */ |
188 | list_del(entry: &blk->mapped_link); |
189 | list_del(entry: &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, page: 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(hdr: emu->memhdr, units: psize << PAGE_SHIFT, prev: 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_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 | * 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(list: &blk->mapped_order_link, |
270 | head: &emu->mapped_order_link_head); |
271 | spin_unlock_irqrestore(lock: &emu->memblk_lock, flags); |
272 | return 0; |
273 | } |
274 | err = map_memblk(emu, blk); |
275 | if (err < 0) { |
276 | /* no enough page - try to unmap some blocks */ |
277 | /* starting from the oldest block */ |
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, blk: deleted); |
285 | if (size >= blk->pages) { |
286 | /* ok the empty region is enough large */ |
287 | err = map_memblk(emu, blk); |
288 | break; |
289 | } |
290 | } |
291 | } |
292 | spin_unlock_irqrestore(lock: &emu->memblk_lock, flags); |
293 | return err; |
294 | } |
295 | |
296 | EXPORT_SYMBOL(snd_emu10k1_memblk_map); |
297 | |
298 | /* |
299 | * page allocation for DMA |
300 | */ |
301 | struct snd_util_memblk * |
302 | snd_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 | mutex_lock(&hdr->block_mutex); |
319 | blk = search_empty(emu, size: runtime->dma_bytes); |
320 | if (blk == NULL) { |
321 | mutex_unlock(lock: &hdr->block_mutex); |
322 | return NULL; |
323 | } |
324 | /* fill buffer addresses but pointers are not stored so that |
325 | * snd_free_pci_page() is not called in synth_free() |
326 | */ |
327 | idx = 0; |
328 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { |
329 | unsigned long ofs = idx << PAGE_SHIFT; |
330 | dma_addr_t addr; |
331 | if (ofs >= runtime->dma_bytes) |
332 | addr = emu->silent_page.addr; |
333 | else |
334 | addr = snd_pcm_sgbuf_get_addr(substream, ofs); |
335 | if (! is_valid_page(emu, addr)) { |
336 | dev_err_ratelimited(emu->card->dev, |
337 | "emu: failure page = %d\n" , idx); |
338 | mutex_unlock(lock: &hdr->block_mutex); |
339 | return NULL; |
340 | } |
341 | emu->page_addr_table[page] = addr; |
342 | emu->page_ptr_table[page] = NULL; |
343 | } |
344 | |
345 | /* set PTB entries */ |
346 | blk->map_locked = 1; /* do not unmap this block! */ |
347 | err = snd_emu10k1_memblk_map(emu, blk); |
348 | if (err < 0) { |
349 | __snd_util_mem_free(hdr, blk: (struct snd_util_memblk *)blk); |
350 | mutex_unlock(lock: &hdr->block_mutex); |
351 | return NULL; |
352 | } |
353 | mutex_unlock(lock: &hdr->block_mutex); |
354 | return (struct snd_util_memblk *)blk; |
355 | } |
356 | |
357 | |
358 | /* |
359 | * release DMA buffer from page table |
360 | */ |
361 | int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) |
362 | { |
363 | if (snd_BUG_ON(!emu || !blk)) |
364 | return -EINVAL; |
365 | return snd_emu10k1_synth_free(emu, blk); |
366 | } |
367 | |
368 | /* |
369 | * allocate DMA pages, widening the allocation if necessary |
370 | * |
371 | * See the comment above snd_emu10k1_detect_iommu() in emu10k1_main.c why |
372 | * this might be needed. |
373 | * |
374 | * If you modify this function check whether __synth_free_pages() also needs |
375 | * changes. |
376 | */ |
377 | int snd_emu10k1_alloc_pages_maybe_wider(struct snd_emu10k1 *emu, size_t size, |
378 | struct snd_dma_buffer *dmab) |
379 | { |
380 | if (emu->iommu_workaround) { |
381 | size_t npages = DIV_ROUND_UP(size, PAGE_SIZE); |
382 | size_t size_real = npages * PAGE_SIZE; |
383 | |
384 | /* |
385 | * The device has been observed to accesses up to 256 extra |
386 | * bytes, but use 1k to be safe. |
387 | */ |
388 | if (size_real < size + 1024) |
389 | size += PAGE_SIZE; |
390 | } |
391 | |
392 | return snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, |
393 | dev: &emu->pci->dev, size, dmab); |
394 | } |
395 | |
396 | /* |
397 | * memory allocation using multiple pages (for synth) |
398 | * Unlike the DMA allocation above, non-contiguous pages are assined. |
399 | */ |
400 | |
401 | /* |
402 | * allocate a synth sample area |
403 | */ |
404 | struct snd_util_memblk * |
405 | snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) |
406 | { |
407 | struct snd_emu10k1_memblk *blk; |
408 | struct snd_util_memhdr *hdr = hw->memhdr; |
409 | |
410 | mutex_lock(&hdr->block_mutex); |
411 | blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); |
412 | if (blk == NULL) { |
413 | mutex_unlock(lock: &hdr->block_mutex); |
414 | return NULL; |
415 | } |
416 | if (synth_alloc_pages(hw, blk)) { |
417 | __snd_util_mem_free(hdr, blk: (struct snd_util_memblk *)blk); |
418 | mutex_unlock(lock: &hdr->block_mutex); |
419 | return NULL; |
420 | } |
421 | snd_emu10k1_memblk_map(hw, blk); |
422 | mutex_unlock(lock: &hdr->block_mutex); |
423 | return (struct snd_util_memblk *)blk; |
424 | } |
425 | |
426 | EXPORT_SYMBOL(snd_emu10k1_synth_alloc); |
427 | |
428 | /* |
429 | * free a synth sample area |
430 | */ |
431 | int |
432 | snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) |
433 | { |
434 | struct snd_util_memhdr *hdr = emu->memhdr; |
435 | struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; |
436 | unsigned long flags; |
437 | |
438 | mutex_lock(&hdr->block_mutex); |
439 | spin_lock_irqsave(&emu->memblk_lock, flags); |
440 | if (blk->mapped_page >= 0) |
441 | unmap_memblk(emu, blk); |
442 | spin_unlock_irqrestore(lock: &emu->memblk_lock, flags); |
443 | synth_free_pages(hw: emu, blk); |
444 | __snd_util_mem_free(hdr, blk: memblk); |
445 | mutex_unlock(lock: &hdr->block_mutex); |
446 | return 0; |
447 | } |
448 | |
449 | EXPORT_SYMBOL(snd_emu10k1_synth_free); |
450 | |
451 | /* check new allocation range */ |
452 | static void get_single_page_range(struct snd_util_memhdr *hdr, |
453 | struct snd_emu10k1_memblk *blk, |
454 | int *first_page_ret, int *last_page_ret) |
455 | { |
456 | struct list_head *p; |
457 | struct snd_emu10k1_memblk *q; |
458 | int first_page, last_page; |
459 | first_page = blk->first_page; |
460 | p = blk->mem.list.prev; |
461 | if (p != &hdr->block) { |
462 | q = get_emu10k1_memblk(p, mem.list); |
463 | if (q->last_page == first_page) |
464 | first_page++; /* first page was already allocated */ |
465 | } |
466 | last_page = blk->last_page; |
467 | p = blk->mem.list.next; |
468 | if (p != &hdr->block) { |
469 | q = get_emu10k1_memblk(p, mem.list); |
470 | if (q->first_page == last_page) |
471 | last_page--; /* last page was already allocated */ |
472 | } |
473 | *first_page_ret = first_page; |
474 | *last_page_ret = last_page; |
475 | } |
476 | |
477 | /* release allocated pages */ |
478 | static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, |
479 | int last_page) |
480 | { |
481 | struct snd_dma_buffer dmab; |
482 | int page; |
483 | |
484 | dmab.dev.type = SNDRV_DMA_TYPE_DEV; |
485 | dmab.dev.dev = &emu->pci->dev; |
486 | |
487 | for (page = first_page; page <= last_page; page++) { |
488 | if (emu->page_ptr_table[page] == NULL) |
489 | continue; |
490 | dmab.area = emu->page_ptr_table[page]; |
491 | dmab.addr = emu->page_addr_table[page]; |
492 | |
493 | /* |
494 | * please keep me in sync with logic in |
495 | * snd_emu10k1_alloc_pages_maybe_wider() |
496 | */ |
497 | dmab.bytes = PAGE_SIZE; |
498 | if (emu->iommu_workaround) |
499 | dmab.bytes *= 2; |
500 | |
501 | snd_dma_free_pages(dmab: &dmab); |
502 | emu->page_addr_table[page] = 0; |
503 | emu->page_ptr_table[page] = NULL; |
504 | } |
505 | } |
506 | |
507 | /* |
508 | * allocate kernel pages |
509 | */ |
510 | static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
511 | { |
512 | int page, first_page, last_page; |
513 | struct snd_dma_buffer dmab; |
514 | |
515 | emu10k1_memblk_init(blk); |
516 | get_single_page_range(hdr: emu->memhdr, blk, first_page_ret: &first_page, last_page_ret: &last_page); |
517 | /* allocate kernel pages */ |
518 | for (page = first_page; page <= last_page; page++) { |
519 | if (snd_emu10k1_alloc_pages_maybe_wider(emu, PAGE_SIZE, |
520 | dmab: &dmab) < 0) |
521 | goto __fail; |
522 | if (!is_valid_page(emu, addr: dmab.addr)) { |
523 | snd_dma_free_pages(dmab: &dmab); |
524 | goto __fail; |
525 | } |
526 | emu->page_addr_table[page] = dmab.addr; |
527 | emu->page_ptr_table[page] = dmab.area; |
528 | } |
529 | return 0; |
530 | |
531 | __fail: |
532 | /* release allocated pages */ |
533 | last_page = page - 1; |
534 | __synth_free_pages(emu, first_page, last_page); |
535 | |
536 | return -ENOMEM; |
537 | } |
538 | |
539 | /* |
540 | * free pages |
541 | */ |
542 | static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
543 | { |
544 | int first_page, last_page; |
545 | |
546 | get_single_page_range(hdr: emu->memhdr, blk, first_page_ret: &first_page, last_page_ret: &last_page); |
547 | __synth_free_pages(emu, first_page, last_page); |
548 | return 0; |
549 | } |
550 | |
551 | /* calculate buffer pointer from offset address */ |
552 | static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
553 | { |
554 | char *ptr; |
555 | if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) |
556 | return NULL; |
557 | ptr = emu->page_ptr_table[page]; |
558 | if (! ptr) { |
559 | dev_err(emu->card->dev, |
560 | "access to NULL ptr: page = %d\n" , page); |
561 | return NULL; |
562 | } |
563 | ptr += offset & (PAGE_SIZE - 1); |
564 | return (void*)ptr; |
565 | } |
566 | |
567 | /* |
568 | * bzero(blk + offset, size) |
569 | */ |
570 | int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
571 | int offset, int size) |
572 | { |
573 | int page, nextofs, end_offset, temp, temp1; |
574 | void *ptr; |
575 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
576 | |
577 | offset += blk->offset & (PAGE_SIZE - 1); |
578 | end_offset = offset + size; |
579 | page = get_aligned_page(offset); |
580 | do { |
581 | nextofs = aligned_page_offset(page + 1); |
582 | temp = nextofs - offset; |
583 | temp1 = end_offset - offset; |
584 | if (temp1 < temp) |
585 | temp = temp1; |
586 | ptr = offset_ptr(emu, page: page + p->first_page, offset); |
587 | if (ptr) |
588 | memset(ptr, 0, temp); |
589 | offset = nextofs; |
590 | page++; |
591 | } while (offset < end_offset); |
592 | return 0; |
593 | } |
594 | |
595 | EXPORT_SYMBOL(snd_emu10k1_synth_bzero); |
596 | |
597 | /* |
598 | * copy_from_user(blk + offset, data, size) |
599 | */ |
600 | int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
601 | int offset, const char __user *data, int size) |
602 | { |
603 | int page, nextofs, end_offset, temp, temp1; |
604 | void *ptr; |
605 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
606 | |
607 | offset += blk->offset & (PAGE_SIZE - 1); |
608 | end_offset = offset + size; |
609 | page = get_aligned_page(offset); |
610 | do { |
611 | nextofs = aligned_page_offset(page + 1); |
612 | temp = nextofs - offset; |
613 | temp1 = end_offset - offset; |
614 | if (temp1 < temp) |
615 | temp = temp1; |
616 | ptr = offset_ptr(emu, page: page + p->first_page, offset); |
617 | if (ptr && copy_from_user(to: ptr, from: data, n: temp)) |
618 | return -EFAULT; |
619 | offset = nextofs; |
620 | data += temp; |
621 | page++; |
622 | } while (offset < end_offset); |
623 | return 0; |
624 | } |
625 | |
626 | EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); |
627 | |