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Commit | Line | Data |
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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 | 24 | #include <linux/pci.h> |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 | 26 | #include <linux/time.h> |
62932df8 IM |
27 | #include <linux/mutex.h> |
28 | ||
1da177e4 LT |
29 | #include <sound/core.h> |
30 | #include <sound/emu10k1.h> | |
31 | ||
32 | /* page arguments of these two macros are Emu page (4096 bytes), not like | |
33 | * aligned pages in others | |
34 | */ | |
35 | #define __set_ptb_entry(emu,page,addr) \ | |
36 | (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page))) | |
37 | ||
38 | #define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) | |
39 | #define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES) | |
40 | /* get aligned page from offset address */ | |
41 | #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) | |
42 | /* get offset address from aligned page */ | |
43 | #define aligned_page_offset(page) ((page) << PAGE_SHIFT) | |
44 | ||
45 | #if PAGE_SIZE == 4096 | |
46 | /* page size == EMUPAGESIZE */ | |
47 | /* fill PTB entrie(s) corresponding to page with addr */ | |
48 | #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) | |
49 | /* fill PTB entrie(s) corresponding to page with silence pointer */ | |
50 | #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) | |
51 | #else | |
52 | /* fill PTB entries -- we need to fill UNIT_PAGES entries */ | |
eb4698f3 | 53 | static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr) |
1da177e4 LT |
54 | { |
55 | int i; | |
56 | page *= UNIT_PAGES; | |
57 | for (i = 0; i < UNIT_PAGES; i++, page++) { | |
58 | __set_ptb_entry(emu, page, addr); | |
59 | addr += EMUPAGESIZE; | |
60 | } | |
61 | } | |
eb4698f3 | 62 | static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page) |
1da177e4 LT |
63 | { |
64 | int i; | |
65 | page *= UNIT_PAGES; | |
66 | for (i = 0; i < UNIT_PAGES; i++, page++) | |
67 | /* do not increment ptr */ | |
68 | __set_ptb_entry(emu, page, emu->silent_page.addr); | |
69 | } | |
70 | #endif /* PAGE_SIZE */ | |
71 | ||
72 | ||
73 | /* | |
74 | */ | |
eb4698f3 TI |
75 | static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); |
76 | static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); | |
1da177e4 | 77 | |
eb4698f3 | 78 | #define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member) |
1da177e4 LT |
79 | |
80 | ||
81 | /* initialize emu10k1 part */ | |
eb4698f3 | 82 | static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
83 | { |
84 | blk->mapped_page = -1; | |
85 | INIT_LIST_HEAD(&blk->mapped_link); | |
86 | INIT_LIST_HEAD(&blk->mapped_order_link); | |
87 | blk->map_locked = 0; | |
88 | ||
89 | blk->first_page = get_aligned_page(blk->mem.offset); | |
90 | blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1); | |
91 | blk->pages = blk->last_page - blk->first_page + 1; | |
92 | } | |
93 | ||
94 | /* | |
95 | * search empty region on PTB with the given size | |
96 | * | |
97 | * if an empty region is found, return the page and store the next mapped block | |
98 | * in nextp | |
99 | * if not found, return a negative error code. | |
100 | */ | |
eb4698f3 | 101 | static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp) |
1da177e4 LT |
102 | { |
103 | int page = 0, found_page = -ENOMEM; | |
104 | int max_size = npages; | |
105 | int size; | |
106 | struct list_head *candidate = &emu->mapped_link_head; | |
107 | struct list_head *pos; | |
108 | ||
109 | list_for_each (pos, &emu->mapped_link_head) { | |
eb4698f3 | 110 | struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link); |
da3cec35 TI |
111 | if (blk->mapped_page < 0) |
112 | continue; | |
1da177e4 LT |
113 | size = blk->mapped_page - page; |
114 | if (size == npages) { | |
115 | *nextp = pos; | |
116 | return page; | |
117 | } | |
118 | else if (size > max_size) { | |
119 | /* we look for the maximum empty hole */ | |
120 | max_size = size; | |
121 | candidate = pos; | |
122 | found_page = page; | |
123 | } | |
124 | page = blk->mapped_page + blk->pages; | |
125 | } | |
126 | size = MAX_ALIGN_PAGES - page; | |
127 | if (size >= max_size) { | |
128 | *nextp = pos; | |
129 | return page; | |
130 | } | |
131 | *nextp = candidate; | |
132 | return found_page; | |
133 | } | |
134 | ||
135 | /* | |
136 | * map a memory block onto emu10k1's PTB | |
137 | * | |
138 | * call with memblk_lock held | |
139 | */ | |
eb4698f3 | 140 | static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
141 | { |
142 | int page, pg; | |
143 | struct list_head *next; | |
144 | ||
145 | page = search_empty_map_area(emu, blk->pages, &next); | |
146 | if (page < 0) /* not found */ | |
147 | return page; | |
148 | /* insert this block in the proper position of mapped list */ | |
149 | list_add_tail(&blk->mapped_link, next); | |
150 | /* append this as a newest block in order list */ | |
151 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
152 | blk->mapped_page = page; | |
153 | /* fill PTB */ | |
154 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
155 | set_ptb_entry(emu, page, emu->page_addr_table[pg]); | |
156 | page++; | |
157 | } | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* | |
162 | * unmap the block | |
163 | * return the size of resultant empty pages | |
164 | * | |
165 | * call with memblk_lock held | |
166 | */ | |
eb4698f3 | 167 | static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
168 | { |
169 | int start_page, end_page, mpage, pg; | |
170 | struct list_head *p; | |
eb4698f3 | 171 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
172 | |
173 | /* calculate the expected size of empty region */ | |
174 | if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { | |
175 | q = get_emu10k1_memblk(p, mapped_link); | |
176 | start_page = q->mapped_page + q->pages; | |
177 | } else | |
178 | start_page = 0; | |
179 | if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { | |
180 | q = get_emu10k1_memblk(p, mapped_link); | |
181 | end_page = q->mapped_page; | |
182 | } else | |
183 | end_page = MAX_ALIGN_PAGES; | |
184 | ||
185 | /* remove links */ | |
186 | list_del(&blk->mapped_link); | |
187 | list_del(&blk->mapped_order_link); | |
188 | /* clear PTB */ | |
189 | mpage = blk->mapped_page; | |
190 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
191 | set_silent_ptb(emu, mpage); | |
192 | mpage++; | |
193 | } | |
194 | blk->mapped_page = -1; | |
195 | return end_page - start_page; /* return the new empty size */ | |
196 | } | |
197 | ||
198 | /* | |
199 | * search empty pages with the given size, and create a memory block | |
200 | * | |
201 | * unlike synth_alloc the memory block is aligned to the page start | |
202 | */ | |
eb4698f3 TI |
203 | static struct snd_emu10k1_memblk * |
204 | search_empty(struct snd_emu10k1 *emu, int size) | |
1da177e4 LT |
205 | { |
206 | struct list_head *p; | |
eb4698f3 | 207 | struct snd_emu10k1_memblk *blk; |
1da177e4 LT |
208 | int page, psize; |
209 | ||
210 | psize = get_aligned_page(size + PAGE_SIZE -1); | |
211 | page = 0; | |
212 | list_for_each(p, &emu->memhdr->block) { | |
213 | blk = get_emu10k1_memblk(p, mem.list); | |
214 | if (page + psize <= blk->first_page) | |
215 | goto __found_pages; | |
216 | page = blk->last_page + 1; | |
217 | } | |
218 | if (page + psize > emu->max_cache_pages) | |
219 | return NULL; | |
220 | ||
221 | __found_pages: | |
222 | /* create a new memory block */ | |
eb4698f3 | 223 | blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); |
1da177e4 LT |
224 | if (blk == NULL) |
225 | return NULL; | |
226 | blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ | |
227 | emu10k1_memblk_init(blk); | |
228 | return blk; | |
229 | } | |
230 | ||
231 | ||
232 | /* | |
233 | * check if the given pointer is valid for pages | |
234 | */ | |
eb4698f3 | 235 | static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) |
1da177e4 LT |
236 | { |
237 | if (addr & ~emu->dma_mask) { | |
99b359ba | 238 | snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr); |
1da177e4 LT |
239 | return 0; |
240 | } | |
241 | if (addr & (EMUPAGESIZE-1)) { | |
99b359ba | 242 | snd_printk(KERN_ERR "page is not aligned\n"); |
1da177e4 LT |
243 | return 0; |
244 | } | |
245 | return 1; | |
246 | } | |
247 | ||
248 | /* | |
249 | * map the given memory block on PTB. | |
250 | * if the block is already mapped, update the link order. | |
25985edc | 251 | * if no empty pages are found, tries to release unused memory blocks |
1da177e4 LT |
252 | * and retry the mapping. |
253 | */ | |
eb4698f3 | 254 | int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
255 | { |
256 | int err; | |
257 | int size; | |
258 | struct list_head *p, *nextp; | |
eb4698f3 | 259 | struct snd_emu10k1_memblk *deleted; |
1da177e4 LT |
260 | unsigned long flags; |
261 | ||
262 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
263 | if (blk->mapped_page >= 0) { | |
264 | /* update order link */ | |
265 | list_del(&blk->mapped_order_link); | |
266 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
267 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
268 | return 0; | |
269 | } | |
270 | if ((err = map_memblk(emu, blk)) < 0) { | |
271 | /* no enough page - try to unmap some blocks */ | |
272 | /* starting from the oldest block */ | |
273 | p = emu->mapped_order_link_head.next; | |
274 | for (; p != &emu->mapped_order_link_head; p = nextp) { | |
275 | nextp = p->next; | |
276 | deleted = get_emu10k1_memblk(p, mapped_order_link); | |
277 | if (deleted->map_locked) | |
278 | continue; | |
279 | size = unmap_memblk(emu, deleted); | |
280 | if (size >= blk->pages) { | |
281 | /* ok the empty region is enough large */ | |
282 | err = map_memblk(emu, blk); | |
283 | break; | |
284 | } | |
285 | } | |
286 | } | |
287 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
288 | return err; | |
289 | } | |
290 | ||
2dd31dee TI |
291 | EXPORT_SYMBOL(snd_emu10k1_memblk_map); |
292 | ||
1da177e4 LT |
293 | /* |
294 | * page allocation for DMA | |
295 | */ | |
eb4698f3 TI |
296 | struct snd_util_memblk * |
297 | snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) | |
1da177e4 | 298 | { |
eb4698f3 | 299 | struct snd_pcm_runtime *runtime = substream->runtime; |
eb4698f3 TI |
300 | struct snd_util_memhdr *hdr; |
301 | struct snd_emu10k1_memblk *blk; | |
1da177e4 LT |
302 | int page, err, idx; |
303 | ||
da3cec35 TI |
304 | if (snd_BUG_ON(!emu)) |
305 | return NULL; | |
306 | if (snd_BUG_ON(runtime->dma_bytes <= 0 || | |
307 | runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE)) | |
308 | return NULL; | |
1da177e4 | 309 | hdr = emu->memhdr; |
da3cec35 TI |
310 | if (snd_BUG_ON(!hdr)) |
311 | return NULL; | |
1da177e4 | 312 | |
56385a12 JK |
313 | idx = runtime->period_size >= runtime->buffer_size ? |
314 | (emu->delay_pcm_irq * 2) : 0; | |
62932df8 | 315 | mutex_lock(&hdr->block_mutex); |
56385a12 | 316 | blk = search_empty(emu, runtime->dma_bytes + idx); |
1da177e4 | 317 | if (blk == NULL) { |
62932df8 | 318 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
319 | return NULL; |
320 | } | |
321 | /* fill buffer addresses but pointers are not stored so that | |
322 | * snd_free_pci_page() is not called in in synth_free() | |
323 | */ | |
324 | idx = 0; | |
325 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { | |
77a23f26 | 326 | unsigned long ofs = idx << PAGE_SHIFT; |
1da177e4 | 327 | dma_addr_t addr; |
77a23f26 | 328 | addr = snd_pcm_sgbuf_get_addr(substream, ofs); |
1da177e4 LT |
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 | 355 | { |
da3cec35 TI |
356 | if (snd_BUG_ON(!emu || !blk)) |
357 | return -EINVAL; | |
1da177e4 LT |
358 | return snd_emu10k1_synth_free(emu, blk); |
359 | } | |
360 | ||
361 | ||
362 | /* | |
363 | * memory allocation using multiple pages (for synth) | |
364 | * Unlike the DMA allocation above, non-contiguous pages are assined. | |
365 | */ | |
366 | ||
367 | /* | |
368 | * allocate a synth sample area | |
369 | */ | |
eb4698f3 TI |
370 | struct snd_util_memblk * |
371 | snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) | |
1da177e4 | 372 | { |
eb4698f3 TI |
373 | struct snd_emu10k1_memblk *blk; |
374 | struct snd_util_memhdr *hdr = hw->memhdr; | |
1da177e4 | 375 | |
62932df8 | 376 | mutex_lock(&hdr->block_mutex); |
eb4698f3 | 377 | blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); |
1da177e4 | 378 | if (blk == NULL) { |
62932df8 | 379 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
380 | return NULL; |
381 | } | |
382 | if (synth_alloc_pages(hw, blk)) { | |
eb4698f3 | 383 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 384 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
385 | return NULL; |
386 | } | |
387 | snd_emu10k1_memblk_map(hw, blk); | |
62932df8 | 388 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 389 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
390 | } |
391 | ||
2dd31dee | 392 | EXPORT_SYMBOL(snd_emu10k1_synth_alloc); |
1da177e4 LT |
393 | |
394 | /* | |
395 | * free a synth sample area | |
396 | */ | |
397 | int | |
eb4698f3 | 398 | snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) |
1da177e4 | 399 | { |
eb4698f3 TI |
400 | struct snd_util_memhdr *hdr = emu->memhdr; |
401 | struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; | |
1da177e4 LT |
402 | unsigned long flags; |
403 | ||
62932df8 | 404 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
405 | spin_lock_irqsave(&emu->memblk_lock, flags); |
406 | if (blk->mapped_page >= 0) | |
407 | unmap_memblk(emu, blk); | |
408 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
409 | synth_free_pages(emu, blk); | |
410 | __snd_util_mem_free(hdr, memblk); | |
62932df8 | 411 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
412 | return 0; |
413 | } | |
414 | ||
2dd31dee | 415 | EXPORT_SYMBOL(snd_emu10k1_synth_free); |
1da177e4 LT |
416 | |
417 | /* check new allocation range */ | |
eb4698f3 TI |
418 | static void get_single_page_range(struct snd_util_memhdr *hdr, |
419 | struct snd_emu10k1_memblk *blk, | |
420 | int *first_page_ret, int *last_page_ret) | |
1da177e4 LT |
421 | { |
422 | struct list_head *p; | |
eb4698f3 | 423 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
424 | int first_page, last_page; |
425 | first_page = blk->first_page; | |
426 | if ((p = blk->mem.list.prev) != &hdr->block) { | |
427 | q = get_emu10k1_memblk(p, mem.list); | |
428 | if (q->last_page == first_page) | |
429 | first_page++; /* first page was already allocated */ | |
430 | } | |
431 | last_page = blk->last_page; | |
432 | if ((p = blk->mem.list.next) != &hdr->block) { | |
433 | q = get_emu10k1_memblk(p, mem.list); | |
434 | if (q->first_page == last_page) | |
435 | last_page--; /* last page was already allocated */ | |
436 | } | |
437 | *first_page_ret = first_page; | |
438 | *last_page_ret = last_page; | |
439 | } | |
440 | ||
a5003fc0 TI |
441 | /* release allocated pages */ |
442 | static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, | |
443 | int last_page) | |
444 | { | |
445 | int page; | |
446 | ||
447 | for (page = first_page; page <= last_page; page++) { | |
448 | free_page((unsigned long)emu->page_ptr_table[page]); | |
449 | emu->page_addr_table[page] = 0; | |
450 | emu->page_ptr_table[page] = NULL; | |
451 | } | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * allocate kernel pages | |
456 | */ | |
eb4698f3 | 457 | static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
458 | { |
459 | int page, first_page, last_page; | |
1da177e4 LT |
460 | |
461 | emu10k1_memblk_init(blk); | |
462 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
463 | /* allocate kernel pages */ | |
464 | for (page = first_page; page <= last_page; page++) { | |
a5003fc0 TI |
465 | /* first try to allocate from <4GB zone */ |
466 | struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | | |
467 | __GFP_NOWARN); | |
9f515b68 | 468 | if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { |
28437305 TI |
469 | if (p) |
470 | __free_page(p); | |
a5003fc0 | 471 | /* try to allocate from <16MB zone */ |
28437305 | 472 | p = alloc_page(GFP_ATOMIC | GFP_DMA | |
a5003fc0 TI |
473 | __GFP_NORETRY | /* no OOM-killer */ |
474 | __GFP_NOWARN); | |
9f515b68 | 475 | } |
a5003fc0 TI |
476 | if (!p) { |
477 | __synth_free_pages(emu, first_page, page - 1); | |
478 | return -ENOMEM; | |
1da177e4 | 479 | } |
a5003fc0 TI |
480 | emu->page_addr_table[page] = page_to_phys(p); |
481 | emu->page_ptr_table[page] = page_address(p); | |
1da177e4 LT |
482 | } |
483 | return 0; | |
1da177e4 LT |
484 | } |
485 | ||
486 | /* | |
487 | * free pages | |
488 | */ | |
eb4698f3 | 489 | static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 | 490 | { |
a5003fc0 | 491 | int first_page, last_page; |
1da177e4 LT |
492 | |
493 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
a5003fc0 | 494 | __synth_free_pages(emu, first_page, last_page); |
1da177e4 LT |
495 | return 0; |
496 | } | |
497 | ||
498 | /* calculate buffer pointer from offset address */ | |
eb4698f3 | 499 | static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
1da177e4 LT |
500 | { |
501 | char *ptr; | |
da3cec35 TI |
502 | if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) |
503 | return NULL; | |
1da177e4 LT |
504 | ptr = emu->page_ptr_table[page]; |
505 | if (! ptr) { | |
99b359ba | 506 | printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page); |
1da177e4 LT |
507 | return NULL; |
508 | } | |
509 | ptr += offset & (PAGE_SIZE - 1); | |
510 | return (void*)ptr; | |
511 | } | |
512 | ||
513 | /* | |
514 | * bzero(blk + offset, size) | |
515 | */ | |
eb4698f3 TI |
516 | int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
517 | int offset, int size) | |
1da177e4 LT |
518 | { |
519 | int page, nextofs, end_offset, temp, temp1; | |
520 | void *ptr; | |
eb4698f3 | 521 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
522 | |
523 | offset += blk->offset & (PAGE_SIZE - 1); | |
524 | end_offset = offset + size; | |
525 | page = get_aligned_page(offset); | |
526 | do { | |
527 | nextofs = aligned_page_offset(page + 1); | |
528 | temp = nextofs - offset; | |
529 | temp1 = end_offset - offset; | |
530 | if (temp1 < temp) | |
531 | temp = temp1; | |
532 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
533 | if (ptr) | |
534 | memset(ptr, 0, temp); | |
535 | offset = nextofs; | |
536 | page++; | |
537 | } while (offset < end_offset); | |
538 | return 0; | |
539 | } | |
540 | ||
2dd31dee TI |
541 | EXPORT_SYMBOL(snd_emu10k1_synth_bzero); |
542 | ||
1da177e4 LT |
543 | /* |
544 | * copy_from_user(blk + offset, data, size) | |
545 | */ | |
eb4698f3 TI |
546 | int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
547 | int offset, const char __user *data, int size) | |
1da177e4 LT |
548 | { |
549 | int page, nextofs, end_offset, temp, temp1; | |
550 | void *ptr; | |
eb4698f3 | 551 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
552 | |
553 | offset += blk->offset & (PAGE_SIZE - 1); | |
554 | end_offset = offset + size; | |
555 | page = get_aligned_page(offset); | |
556 | do { | |
557 | nextofs = aligned_page_offset(page + 1); | |
558 | temp = nextofs - offset; | |
559 | temp1 = end_offset - offset; | |
560 | if (temp1 < temp) | |
561 | temp = temp1; | |
562 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
563 | if (ptr && copy_from_user(ptr, data, temp)) | |
564 | return -EFAULT; | |
565 | offset = nextofs; | |
566 | data += temp; | |
567 | page++; | |
568 | } while (offset < end_offset); | |
569 | return 0; | |
570 | } | |
2dd31dee TI |
571 | |
572 | EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); |