Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
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 | ||
1da177e4 LT |
24 | #include <linux/pci.h> |
25 | #include <linux/time.h> | |
62932df8 IM |
26 | #include <linux/mutex.h> |
27 | ||
1da177e4 LT |
28 | #include <sound/core.h> |
29 | #include <sound/emu10k1.h> | |
30 | ||
31 | /* page arguments of these two macros are Emu page (4096 bytes), not like | |
32 | * aligned pages in others | |
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 | /* get aligned page from offset address */ | |
40 | #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) | |
41 | /* get offset address from aligned page */ | |
42 | #define aligned_page_offset(page) ((page) << PAGE_SHIFT) | |
43 | ||
44 | #if PAGE_SIZE == 4096 | |
45 | /* page size == EMUPAGESIZE */ | |
46 | /* fill PTB entrie(s) corresponding to page with addr */ | |
47 | #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) | |
48 | /* fill PTB entrie(s) corresponding to page with silence pointer */ | |
49 | #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) | |
50 | #else | |
51 | /* fill PTB entries -- we need to fill UNIT_PAGES entries */ | |
eb4698f3 | 52 | static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr) |
1da177e4 LT |
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 | } | |
eb4698f3 | 61 | static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page) |
1da177e4 LT |
62 | { |
63 | int i; | |
64 | page *= UNIT_PAGES; | |
65 | for (i = 0; i < UNIT_PAGES; i++, page++) | |
66 | /* do not increment ptr */ | |
67 | __set_ptb_entry(emu, page, emu->silent_page.addr); | |
68 | } | |
69 | #endif /* PAGE_SIZE */ | |
70 | ||
71 | ||
72 | /* | |
73 | */ | |
eb4698f3 TI |
74 | static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); |
75 | static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); | |
1da177e4 | 76 | |
eb4698f3 | 77 | #define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member) |
1da177e4 LT |
78 | |
79 | ||
80 | /* initialize emu10k1 part */ | |
eb4698f3 | 81 | static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
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 | * search empty region on PTB with the given size | |
95 | * | |
96 | * if an empty region is found, return the page and store the next mapped block | |
97 | * in nextp | |
98 | * if not found, return a negative error code. | |
99 | */ | |
eb4698f3 | 100 | static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp) |
1da177e4 LT |
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) { | |
eb4698f3 | 109 | struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link); |
1da177e4 LT |
110 | snd_assert(blk->mapped_page >= 0, continue); |
111 | size = blk->mapped_page - page; | |
112 | if (size == npages) { | |
113 | *nextp = pos; | |
114 | return page; | |
115 | } | |
116 | else if (size > max_size) { | |
117 | /* we look for the maximum empty hole */ | |
118 | max_size = size; | |
119 | candidate = pos; | |
120 | found_page = page; | |
121 | } | |
122 | page = blk->mapped_page + blk->pages; | |
123 | } | |
124 | size = MAX_ALIGN_PAGES - page; | |
125 | if (size >= max_size) { | |
126 | *nextp = pos; | |
127 | return page; | |
128 | } | |
129 | *nextp = candidate; | |
130 | return found_page; | |
131 | } | |
132 | ||
133 | /* | |
134 | * map a memory block onto emu10k1's PTB | |
135 | * | |
136 | * call with memblk_lock held | |
137 | */ | |
eb4698f3 | 138 | static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
139 | { |
140 | int page, pg; | |
141 | struct list_head *next; | |
142 | ||
143 | page = search_empty_map_area(emu, blk->pages, &next); | |
144 | if (page < 0) /* not found */ | |
145 | return page; | |
146 | /* insert this block in the proper position of mapped list */ | |
147 | list_add_tail(&blk->mapped_link, next); | |
148 | /* append this as a newest block in order list */ | |
149 | list_add_tail(&blk->mapped_order_link, &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, 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 | */ | |
eb4698f3 | 165 | static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
166 | { |
167 | int start_page, end_page, mpage, pg; | |
168 | struct list_head *p; | |
eb4698f3 | 169 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
170 | |
171 | /* calculate the expected size of empty region */ | |
172 | if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { | |
173 | q = get_emu10k1_memblk(p, mapped_link); | |
174 | start_page = q->mapped_page + q->pages; | |
175 | } else | |
176 | start_page = 0; | |
177 | if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { | |
178 | q = get_emu10k1_memblk(p, mapped_link); | |
179 | end_page = q->mapped_page; | |
180 | } else | |
181 | end_page = MAX_ALIGN_PAGES; | |
182 | ||
183 | /* remove links */ | |
184 | list_del(&blk->mapped_link); | |
185 | list_del(&blk->mapped_order_link); | |
186 | /* clear PTB */ | |
187 | mpage = blk->mapped_page; | |
188 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
189 | set_silent_ptb(emu, mpage); | |
190 | mpage++; | |
191 | } | |
192 | blk->mapped_page = -1; | |
193 | return end_page - start_page; /* return the new empty size */ | |
194 | } | |
195 | ||
196 | /* | |
197 | * search empty pages with the given size, and create a memory block | |
198 | * | |
199 | * unlike synth_alloc the memory block is aligned to the page start | |
200 | */ | |
eb4698f3 TI |
201 | static struct snd_emu10k1_memblk * |
202 | search_empty(struct snd_emu10k1 *emu, int size) | |
1da177e4 LT |
203 | { |
204 | struct list_head *p; | |
eb4698f3 | 205 | struct snd_emu10k1_memblk *blk; |
1da177e4 LT |
206 | int page, psize; |
207 | ||
208 | psize = get_aligned_page(size + PAGE_SIZE -1); | |
209 | page = 0; | |
210 | list_for_each(p, &emu->memhdr->block) { | |
211 | blk = get_emu10k1_memblk(p, mem.list); | |
212 | if (page + psize <= blk->first_page) | |
213 | goto __found_pages; | |
214 | page = blk->last_page + 1; | |
215 | } | |
216 | if (page + psize > emu->max_cache_pages) | |
217 | return NULL; | |
218 | ||
219 | __found_pages: | |
220 | /* create a new memory block */ | |
eb4698f3 | 221 | blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); |
1da177e4 LT |
222 | if (blk == NULL) |
223 | return NULL; | |
224 | blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ | |
225 | emu10k1_memblk_init(blk); | |
226 | return blk; | |
227 | } | |
228 | ||
229 | ||
230 | /* | |
231 | * check if the given pointer is valid for pages | |
232 | */ | |
eb4698f3 | 233 | static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) |
1da177e4 LT |
234 | { |
235 | if (addr & ~emu->dma_mask) { | |
99b359ba | 236 | snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr); |
1da177e4 LT |
237 | return 0; |
238 | } | |
239 | if (addr & (EMUPAGESIZE-1)) { | |
99b359ba | 240 | snd_printk(KERN_ERR "page is not aligned\n"); |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | return 1; | |
244 | } | |
245 | ||
246 | /* | |
247 | * map the given memory block on PTB. | |
248 | * if the block is already mapped, update the link order. | |
249 | * if no empty pages are found, tries to release unsed memory blocks | |
250 | * and retry the mapping. | |
251 | */ | |
eb4698f3 | 252 | int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
253 | { |
254 | int err; | |
255 | int size; | |
256 | struct list_head *p, *nextp; | |
eb4698f3 | 257 | struct snd_emu10k1_memblk *deleted; |
1da177e4 LT |
258 | unsigned long flags; |
259 | ||
260 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
261 | if (blk->mapped_page >= 0) { | |
262 | /* update order link */ | |
263 | list_del(&blk->mapped_order_link); | |
264 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
265 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
266 | return 0; | |
267 | } | |
268 | if ((err = map_memblk(emu, blk)) < 0) { | |
269 | /* no enough page - try to unmap some blocks */ | |
270 | /* starting from the oldest block */ | |
271 | p = emu->mapped_order_link_head.next; | |
272 | for (; p != &emu->mapped_order_link_head; p = nextp) { | |
273 | nextp = p->next; | |
274 | deleted = get_emu10k1_memblk(p, mapped_order_link); | |
275 | if (deleted->map_locked) | |
276 | continue; | |
277 | size = unmap_memblk(emu, deleted); | |
278 | if (size >= blk->pages) { | |
279 | /* ok the empty region is enough large */ | |
280 | err = map_memblk(emu, blk); | |
281 | break; | |
282 | } | |
283 | } | |
284 | } | |
285 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
286 | return err; | |
287 | } | |
288 | ||
2dd31dee TI |
289 | EXPORT_SYMBOL(snd_emu10k1_memblk_map); |
290 | ||
1da177e4 LT |
291 | /* |
292 | * page allocation for DMA | |
293 | */ | |
eb4698f3 TI |
294 | struct snd_util_memblk * |
295 | snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) | |
1da177e4 | 296 | { |
eb4698f3 | 297 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 298 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); |
eb4698f3 TI |
299 | struct snd_util_memhdr *hdr; |
300 | struct snd_emu10k1_memblk *blk; | |
1da177e4 LT |
301 | int page, err, idx; |
302 | ||
303 | snd_assert(emu, return NULL); | |
304 | snd_assert(runtime->dma_bytes > 0 && runtime->dma_bytes < MAXPAGES * EMUPAGESIZE, return NULL); | |
305 | hdr = emu->memhdr; | |
306 | snd_assert(hdr, return NULL); | |
307 | ||
62932df8 | 308 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
309 | blk = search_empty(emu, runtime->dma_bytes); |
310 | if (blk == NULL) { | |
62932df8 | 311 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
312 | return NULL; |
313 | } | |
314 | /* fill buffer addresses but pointers are not stored so that | |
315 | * snd_free_pci_page() is not called in in synth_free() | |
316 | */ | |
317 | idx = 0; | |
318 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { | |
319 | dma_addr_t addr; | |
320 | #ifdef CONFIG_SND_DEBUG | |
321 | if (idx >= sgbuf->pages) { | |
322 | printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n", | |
323 | blk->first_page, blk->last_page, sgbuf->pages); | |
62932df8 | 324 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
325 | return NULL; |
326 | } | |
327 | #endif | |
328 | addr = sgbuf->table[idx].addr; | |
329 | if (! is_valid_page(emu, addr)) { | |
330 | printk(KERN_ERR "emu: failure page = %d\n", idx); | |
62932df8 | 331 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
332 | return NULL; |
333 | } | |
334 | emu->page_addr_table[page] = addr; | |
335 | emu->page_ptr_table[page] = NULL; | |
336 | } | |
337 | ||
338 | /* set PTB entries */ | |
339 | blk->map_locked = 1; /* do not unmap this block! */ | |
340 | err = snd_emu10k1_memblk_map(emu, blk); | |
341 | if (err < 0) { | |
eb4698f3 | 342 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 343 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
344 | return NULL; |
345 | } | |
62932df8 | 346 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 347 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
348 | } |
349 | ||
350 | ||
351 | /* | |
352 | * release DMA buffer from page table | |
353 | */ | |
eb4698f3 | 354 | int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) |
1da177e4 LT |
355 | { |
356 | snd_assert(emu && blk, return -EINVAL); | |
357 | return snd_emu10k1_synth_free(emu, blk); | |
358 | } | |
359 | ||
360 | ||
361 | /* | |
362 | * memory allocation using multiple pages (for synth) | |
363 | * Unlike the DMA allocation above, non-contiguous pages are assined. | |
364 | */ | |
365 | ||
366 | /* | |
367 | * allocate a synth sample area | |
368 | */ | |
eb4698f3 TI |
369 | struct snd_util_memblk * |
370 | snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) | |
1da177e4 | 371 | { |
eb4698f3 TI |
372 | struct snd_emu10k1_memblk *blk; |
373 | struct snd_util_memhdr *hdr = hw->memhdr; | |
1da177e4 | 374 | |
62932df8 | 375 | mutex_lock(&hdr->block_mutex); |
eb4698f3 | 376 | blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); |
1da177e4 | 377 | if (blk == NULL) { |
62932df8 | 378 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
379 | return NULL; |
380 | } | |
381 | if (synth_alloc_pages(hw, blk)) { | |
eb4698f3 | 382 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 383 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
384 | return NULL; |
385 | } | |
386 | snd_emu10k1_memblk_map(hw, blk); | |
62932df8 | 387 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 388 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
389 | } |
390 | ||
2dd31dee | 391 | EXPORT_SYMBOL(snd_emu10k1_synth_alloc); |
1da177e4 LT |
392 | |
393 | /* | |
394 | * free a synth sample area | |
395 | */ | |
396 | int | |
eb4698f3 | 397 | snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) |
1da177e4 | 398 | { |
eb4698f3 TI |
399 | struct snd_util_memhdr *hdr = emu->memhdr; |
400 | struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; | |
1da177e4 LT |
401 | unsigned long flags; |
402 | ||
62932df8 | 403 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
404 | spin_lock_irqsave(&emu->memblk_lock, flags); |
405 | if (blk->mapped_page >= 0) | |
406 | unmap_memblk(emu, blk); | |
407 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
408 | synth_free_pages(emu, blk); | |
409 | __snd_util_mem_free(hdr, memblk); | |
62932df8 | 410 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
411 | return 0; |
412 | } | |
413 | ||
2dd31dee | 414 | EXPORT_SYMBOL(snd_emu10k1_synth_free); |
1da177e4 LT |
415 | |
416 | /* check new allocation range */ | |
eb4698f3 TI |
417 | static void get_single_page_range(struct snd_util_memhdr *hdr, |
418 | struct snd_emu10k1_memblk *blk, | |
419 | int *first_page_ret, int *last_page_ret) | |
1da177e4 LT |
420 | { |
421 | struct list_head *p; | |
eb4698f3 | 422 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
423 | int first_page, last_page; |
424 | first_page = blk->first_page; | |
425 | if ((p = blk->mem.list.prev) != &hdr->block) { | |
426 | q = get_emu10k1_memblk(p, mem.list); | |
427 | if (q->last_page == first_page) | |
428 | first_page++; /* first page was already allocated */ | |
429 | } | |
430 | last_page = blk->last_page; | |
431 | if ((p = blk->mem.list.next) != &hdr->block) { | |
432 | q = get_emu10k1_memblk(p, mem.list); | |
433 | if (q->first_page == last_page) | |
434 | last_page--; /* last page was already allocated */ | |
435 | } | |
436 | *first_page_ret = first_page; | |
437 | *last_page_ret = last_page; | |
438 | } | |
439 | ||
440 | /* | |
441 | * allocate kernel pages | |
442 | */ | |
eb4698f3 | 443 | static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
444 | { |
445 | int page, first_page, last_page; | |
446 | struct snd_dma_buffer dmab; | |
447 | ||
448 | emu10k1_memblk_init(blk); | |
449 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
450 | /* allocate kernel pages */ | |
451 | for (page = first_page; page <= last_page; page++) { | |
452 | if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci), | |
453 | PAGE_SIZE, &dmab) < 0) | |
454 | goto __fail; | |
455 | if (! is_valid_page(emu, dmab.addr)) { | |
456 | snd_dma_free_pages(&dmab); | |
457 | goto __fail; | |
458 | } | |
459 | emu->page_addr_table[page] = dmab.addr; | |
460 | emu->page_ptr_table[page] = dmab.area; | |
461 | } | |
462 | return 0; | |
463 | ||
464 | __fail: | |
465 | /* release allocated pages */ | |
466 | last_page = page - 1; | |
467 | for (page = first_page; page <= last_page; page++) { | |
468 | dmab.area = emu->page_ptr_table[page]; | |
469 | dmab.addr = emu->page_addr_table[page]; | |
470 | dmab.bytes = PAGE_SIZE; | |
471 | snd_dma_free_pages(&dmab); | |
472 | emu->page_addr_table[page] = 0; | |
473 | emu->page_ptr_table[page] = NULL; | |
474 | } | |
475 | ||
476 | return -ENOMEM; | |
477 | } | |
478 | ||
479 | /* | |
480 | * free pages | |
481 | */ | |
eb4698f3 | 482 | static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
483 | { |
484 | int page, first_page, last_page; | |
485 | struct snd_dma_buffer dmab; | |
486 | ||
487 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
488 | dmab.dev.type = SNDRV_DMA_TYPE_DEV; | |
489 | dmab.dev.dev = snd_dma_pci_data(emu->pci); | |
490 | for (page = first_page; page <= last_page; page++) { | |
491 | if (emu->page_ptr_table[page] == NULL) | |
492 | continue; | |
493 | dmab.area = emu->page_ptr_table[page]; | |
494 | dmab.addr = emu->page_addr_table[page]; | |
495 | dmab.bytes = PAGE_SIZE; | |
496 | snd_dma_free_pages(&dmab); | |
497 | emu->page_addr_table[page] = 0; | |
498 | emu->page_ptr_table[page] = NULL; | |
499 | } | |
500 | ||
501 | return 0; | |
502 | } | |
503 | ||
504 | /* calculate buffer pointer from offset address */ | |
eb4698f3 | 505 | static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
1da177e4 LT |
506 | { |
507 | char *ptr; | |
508 | snd_assert(page >= 0 && page < emu->max_cache_pages, return NULL); | |
509 | ptr = emu->page_ptr_table[page]; | |
510 | if (! ptr) { | |
99b359ba | 511 | printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page); |
1da177e4 LT |
512 | return NULL; |
513 | } | |
514 | ptr += offset & (PAGE_SIZE - 1); | |
515 | return (void*)ptr; | |
516 | } | |
517 | ||
518 | /* | |
519 | * bzero(blk + offset, size) | |
520 | */ | |
eb4698f3 TI |
521 | int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
522 | int offset, int size) | |
1da177e4 LT |
523 | { |
524 | int page, nextofs, end_offset, temp, temp1; | |
525 | void *ptr; | |
eb4698f3 | 526 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
527 | |
528 | offset += blk->offset & (PAGE_SIZE - 1); | |
529 | end_offset = offset + size; | |
530 | page = get_aligned_page(offset); | |
531 | do { | |
532 | nextofs = aligned_page_offset(page + 1); | |
533 | temp = nextofs - offset; | |
534 | temp1 = end_offset - offset; | |
535 | if (temp1 < temp) | |
536 | temp = temp1; | |
537 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
538 | if (ptr) | |
539 | memset(ptr, 0, temp); | |
540 | offset = nextofs; | |
541 | page++; | |
542 | } while (offset < end_offset); | |
543 | return 0; | |
544 | } | |
545 | ||
2dd31dee TI |
546 | EXPORT_SYMBOL(snd_emu10k1_synth_bzero); |
547 | ||
1da177e4 LT |
548 | /* |
549 | * copy_from_user(blk + offset, data, size) | |
550 | */ | |
eb4698f3 TI |
551 | int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
552 | int offset, const char __user *data, int size) | |
1da177e4 LT |
553 | { |
554 | int page, nextofs, end_offset, temp, temp1; | |
555 | void *ptr; | |
eb4698f3 | 556 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
557 | |
558 | offset += blk->offset & (PAGE_SIZE - 1); | |
559 | end_offset = offset + size; | |
560 | page = get_aligned_page(offset); | |
561 | do { | |
562 | nextofs = aligned_page_offset(page + 1); | |
563 | temp = nextofs - offset; | |
564 | temp1 = end_offset - offset; | |
565 | if (temp1 < temp) | |
566 | temp = temp1; | |
567 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
568 | if (ptr && copy_from_user(ptr, data, temp)) | |
569 | return -EFAULT; | |
570 | offset = nextofs; | |
571 | data += temp; | |
572 | page++; | |
573 | } while (offset < end_offset); | |
574 | return 0; | |
575 | } | |
2dd31dee TI |
576 | |
577 | EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); |