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 | 24 | #include <linux/pci.h> |
5a0e3ad6 | 25 | #include <linux/gfp.h> |
1da177e4 | 26 | #include <linux/time.h> |
62932df8 | 27 | #include <linux/mutex.h> |
d81a6d71 | 28 | #include <linux/export.h> |
62932df8 | 29 | |
1da177e4 LT |
30 | #include <sound/core.h> |
31 | #include <sound/emu10k1.h> | |
32 | ||
33 | /* page arguments of these two macros are Emu page (4096 bytes), not like | |
34 | * aligned pages in others | |
35 | */ | |
36 | #define __set_ptb_entry(emu,page,addr) \ | |
37 | (((u32 *)(emu)->ptb_pages.area)[page] = cpu_to_le32(((addr) << 1) | (page))) | |
38 | ||
39 | #define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) | |
40 | #define MAX_ALIGN_PAGES (MAXPAGES / UNIT_PAGES) | |
41 | /* get aligned page from offset address */ | |
42 | #define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) | |
43 | /* get offset address from aligned page */ | |
44 | #define aligned_page_offset(page) ((page) << PAGE_SHIFT) | |
45 | ||
46 | #if PAGE_SIZE == 4096 | |
47 | /* page size == EMUPAGESIZE */ | |
48 | /* fill PTB entrie(s) corresponding to page with addr */ | |
49 | #define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) | |
50 | /* fill PTB entrie(s) corresponding to page with silence pointer */ | |
51 | #define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) | |
52 | #else | |
53 | /* fill PTB entries -- we need to fill UNIT_PAGES entries */ | |
eb4698f3 | 54 | static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr) |
1da177e4 LT |
55 | { |
56 | int i; | |
57 | page *= UNIT_PAGES; | |
58 | for (i = 0; i < UNIT_PAGES; i++, page++) { | |
59 | __set_ptb_entry(emu, page, addr); | |
60 | addr += EMUPAGESIZE; | |
61 | } | |
62 | } | |
eb4698f3 | 63 | static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page) |
1da177e4 LT |
64 | { |
65 | int i; | |
66 | page *= UNIT_PAGES; | |
67 | for (i = 0; i < UNIT_PAGES; i++, page++) | |
68 | /* do not increment ptr */ | |
69 | __set_ptb_entry(emu, page, emu->silent_page.addr); | |
70 | } | |
71 | #endif /* PAGE_SIZE */ | |
72 | ||
73 | ||
74 | /* | |
75 | */ | |
eb4698f3 TI |
76 | static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); |
77 | static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); | |
1da177e4 | 78 | |
eb4698f3 | 79 | #define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member) |
1da177e4 LT |
80 | |
81 | ||
82 | /* initialize emu10k1 part */ | |
eb4698f3 | 83 | static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
84 | { |
85 | blk->mapped_page = -1; | |
86 | INIT_LIST_HEAD(&blk->mapped_link); | |
87 | INIT_LIST_HEAD(&blk->mapped_order_link); | |
88 | blk->map_locked = 0; | |
89 | ||
90 | blk->first_page = get_aligned_page(blk->mem.offset); | |
91 | blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1); | |
92 | blk->pages = blk->last_page - blk->first_page + 1; | |
93 | } | |
94 | ||
95 | /* | |
96 | * search empty region on PTB with the given size | |
97 | * | |
98 | * if an empty region is found, return the page and store the next mapped block | |
99 | * in nextp | |
100 | * if not found, return a negative error code. | |
101 | */ | |
eb4698f3 | 102 | static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp) |
1da177e4 LT |
103 | { |
104 | int page = 0, found_page = -ENOMEM; | |
105 | int max_size = npages; | |
106 | int size; | |
107 | struct list_head *candidate = &emu->mapped_link_head; | |
108 | struct list_head *pos; | |
109 | ||
110 | list_for_each (pos, &emu->mapped_link_head) { | |
eb4698f3 | 111 | struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link); |
da3cec35 TI |
112 | if (blk->mapped_page < 0) |
113 | continue; | |
1da177e4 LT |
114 | size = blk->mapped_page - page; |
115 | if (size == npages) { | |
116 | *nextp = pos; | |
117 | return page; | |
118 | } | |
119 | else if (size > max_size) { | |
120 | /* we look for the maximum empty hole */ | |
121 | max_size = size; | |
122 | candidate = pos; | |
123 | found_page = page; | |
124 | } | |
125 | page = blk->mapped_page + blk->pages; | |
126 | } | |
127 | size = MAX_ALIGN_PAGES - page; | |
128 | if (size >= max_size) { | |
129 | *nextp = pos; | |
130 | return page; | |
131 | } | |
132 | *nextp = candidate; | |
133 | return found_page; | |
134 | } | |
135 | ||
136 | /* | |
137 | * map a memory block onto emu10k1's PTB | |
138 | * | |
139 | * call with memblk_lock held | |
140 | */ | |
eb4698f3 | 141 | static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
142 | { |
143 | int page, pg; | |
144 | struct list_head *next; | |
145 | ||
146 | page = search_empty_map_area(emu, blk->pages, &next); | |
147 | if (page < 0) /* not found */ | |
148 | return page; | |
149 | /* insert this block in the proper position of mapped list */ | |
150 | list_add_tail(&blk->mapped_link, next); | |
151 | /* append this as a newest block in order list */ | |
152 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
153 | blk->mapped_page = page; | |
154 | /* fill PTB */ | |
155 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
156 | set_ptb_entry(emu, page, emu->page_addr_table[pg]); | |
157 | page++; | |
158 | } | |
159 | return 0; | |
160 | } | |
161 | ||
162 | /* | |
163 | * unmap the block | |
164 | * return the size of resultant empty pages | |
165 | * | |
166 | * call with memblk_lock held | |
167 | */ | |
eb4698f3 | 168 | static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
169 | { |
170 | int start_page, end_page, mpage, pg; | |
171 | struct list_head *p; | |
eb4698f3 | 172 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
173 | |
174 | /* calculate the expected size of empty region */ | |
175 | if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { | |
176 | q = get_emu10k1_memblk(p, mapped_link); | |
177 | start_page = q->mapped_page + q->pages; | |
178 | } else | |
179 | start_page = 0; | |
180 | if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { | |
181 | q = get_emu10k1_memblk(p, mapped_link); | |
182 | end_page = q->mapped_page; | |
183 | } else | |
184 | end_page = MAX_ALIGN_PAGES; | |
185 | ||
186 | /* remove links */ | |
187 | list_del(&blk->mapped_link); | |
188 | list_del(&blk->mapped_order_link); | |
189 | /* clear PTB */ | |
190 | mpage = blk->mapped_page; | |
191 | for (pg = blk->first_page; pg <= blk->last_page; pg++) { | |
192 | set_silent_ptb(emu, mpage); | |
193 | mpage++; | |
194 | } | |
195 | blk->mapped_page = -1; | |
196 | return end_page - start_page; /* return the new empty size */ | |
197 | } | |
198 | ||
199 | /* | |
200 | * search empty pages with the given size, and create a memory block | |
201 | * | |
202 | * unlike synth_alloc the memory block is aligned to the page start | |
203 | */ | |
eb4698f3 TI |
204 | static struct snd_emu10k1_memblk * |
205 | search_empty(struct snd_emu10k1 *emu, int size) | |
1da177e4 LT |
206 | { |
207 | struct list_head *p; | |
eb4698f3 | 208 | struct snd_emu10k1_memblk *blk; |
1da177e4 LT |
209 | int page, psize; |
210 | ||
211 | psize = get_aligned_page(size + PAGE_SIZE -1); | |
212 | page = 0; | |
213 | list_for_each(p, &emu->memhdr->block) { | |
214 | blk = get_emu10k1_memblk(p, mem.list); | |
215 | if (page + psize <= blk->first_page) | |
216 | goto __found_pages; | |
217 | page = blk->last_page + 1; | |
218 | } | |
219 | if (page + psize > emu->max_cache_pages) | |
220 | return NULL; | |
221 | ||
222 | __found_pages: | |
223 | /* create a new memory block */ | |
eb4698f3 | 224 | blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); |
1da177e4 LT |
225 | if (blk == NULL) |
226 | return NULL; | |
227 | blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ | |
228 | emu10k1_memblk_init(blk); | |
229 | return blk; | |
230 | } | |
231 | ||
232 | ||
233 | /* | |
234 | * check if the given pointer is valid for pages | |
235 | */ | |
eb4698f3 | 236 | static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) |
1da177e4 LT |
237 | { |
238 | if (addr & ~emu->dma_mask) { | |
99b359ba | 239 | snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr); |
1da177e4 LT |
240 | return 0; |
241 | } | |
242 | if (addr & (EMUPAGESIZE-1)) { | |
99b359ba | 243 | snd_printk(KERN_ERR "page is not aligned\n"); |
1da177e4 LT |
244 | return 0; |
245 | } | |
246 | return 1; | |
247 | } | |
248 | ||
249 | /* | |
250 | * map the given memory block on PTB. | |
251 | * if the block is already mapped, update the link order. | |
25985edc | 252 | * if no empty pages are found, tries to release unused memory blocks |
1da177e4 LT |
253 | * and retry the mapping. |
254 | */ | |
eb4698f3 | 255 | int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
256 | { |
257 | int err; | |
258 | int size; | |
259 | struct list_head *p, *nextp; | |
eb4698f3 | 260 | struct snd_emu10k1_memblk *deleted; |
1da177e4 LT |
261 | unsigned long flags; |
262 | ||
263 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
264 | if (blk->mapped_page >= 0) { | |
265 | /* update order link */ | |
266 | list_del(&blk->mapped_order_link); | |
267 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
268 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
269 | return 0; | |
270 | } | |
271 | if ((err = map_memblk(emu, blk)) < 0) { | |
272 | /* no enough page - try to unmap some blocks */ | |
273 | /* starting from the oldest block */ | |
274 | p = emu->mapped_order_link_head.next; | |
275 | for (; p != &emu->mapped_order_link_head; p = nextp) { | |
276 | nextp = p->next; | |
277 | deleted = get_emu10k1_memblk(p, mapped_order_link); | |
278 | if (deleted->map_locked) | |
279 | continue; | |
280 | size = unmap_memblk(emu, deleted); | |
281 | if (size >= blk->pages) { | |
282 | /* ok the empty region is enough large */ | |
283 | err = map_memblk(emu, blk); | |
284 | break; | |
285 | } | |
286 | } | |
287 | } | |
288 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
289 | return err; | |
290 | } | |
291 | ||
2dd31dee TI |
292 | EXPORT_SYMBOL(snd_emu10k1_memblk_map); |
293 | ||
1da177e4 LT |
294 | /* |
295 | * page allocation for DMA | |
296 | */ | |
eb4698f3 TI |
297 | struct snd_util_memblk * |
298 | snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) | |
1da177e4 | 299 | { |
eb4698f3 | 300 | struct snd_pcm_runtime *runtime = substream->runtime; |
eb4698f3 TI |
301 | struct snd_util_memhdr *hdr; |
302 | struct snd_emu10k1_memblk *blk; | |
1da177e4 LT |
303 | int page, err, idx; |
304 | ||
da3cec35 TI |
305 | if (snd_BUG_ON(!emu)) |
306 | return NULL; | |
307 | if (snd_BUG_ON(runtime->dma_bytes <= 0 || | |
308 | runtime->dma_bytes >= MAXPAGES * EMUPAGESIZE)) | |
309 | return NULL; | |
1da177e4 | 310 | hdr = emu->memhdr; |
da3cec35 TI |
311 | if (snd_BUG_ON(!hdr)) |
312 | return NULL; | |
1da177e4 | 313 | |
56385a12 JK |
314 | idx = runtime->period_size >= runtime->buffer_size ? |
315 | (emu->delay_pcm_irq * 2) : 0; | |
62932df8 | 316 | mutex_lock(&hdr->block_mutex); |
56385a12 | 317 | blk = search_empty(emu, runtime->dma_bytes + idx); |
1da177e4 | 318 | if (blk == NULL) { |
62932df8 | 319 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
320 | return NULL; |
321 | } | |
322 | /* fill buffer addresses but pointers are not stored so that | |
323 | * snd_free_pci_page() is not called in in synth_free() | |
324 | */ | |
325 | idx = 0; | |
326 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { | |
77a23f26 | 327 | unsigned long ofs = idx << PAGE_SHIFT; |
1da177e4 | 328 | dma_addr_t addr; |
77a23f26 | 329 | addr = snd_pcm_sgbuf_get_addr(substream, ofs); |
1da177e4 LT |
330 | if (! is_valid_page(emu, addr)) { |
331 | printk(KERN_ERR "emu: failure page = %d\n", idx); | |
62932df8 | 332 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
333 | return NULL; |
334 | } | |
335 | emu->page_addr_table[page] = addr; | |
336 | emu->page_ptr_table[page] = NULL; | |
337 | } | |
338 | ||
339 | /* set PTB entries */ | |
340 | blk->map_locked = 1; /* do not unmap this block! */ | |
341 | err = snd_emu10k1_memblk_map(emu, blk); | |
342 | if (err < 0) { | |
eb4698f3 | 343 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 344 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
345 | return NULL; |
346 | } | |
62932df8 | 347 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 348 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
349 | } |
350 | ||
351 | ||
352 | /* | |
353 | * release DMA buffer from page table | |
354 | */ | |
eb4698f3 | 355 | int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) |
1da177e4 | 356 | { |
da3cec35 TI |
357 | if (snd_BUG_ON(!emu || !blk)) |
358 | return -EINVAL; | |
1da177e4 LT |
359 | return snd_emu10k1_synth_free(emu, blk); |
360 | } | |
361 | ||
362 | ||
363 | /* | |
364 | * memory allocation using multiple pages (for synth) | |
365 | * Unlike the DMA allocation above, non-contiguous pages are assined. | |
366 | */ | |
367 | ||
368 | /* | |
369 | * allocate a synth sample area | |
370 | */ | |
eb4698f3 TI |
371 | struct snd_util_memblk * |
372 | snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) | |
1da177e4 | 373 | { |
eb4698f3 TI |
374 | struct snd_emu10k1_memblk *blk; |
375 | struct snd_util_memhdr *hdr = hw->memhdr; | |
1da177e4 | 376 | |
62932df8 | 377 | mutex_lock(&hdr->block_mutex); |
eb4698f3 | 378 | blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); |
1da177e4 | 379 | if (blk == NULL) { |
62932df8 | 380 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
381 | return NULL; |
382 | } | |
383 | if (synth_alloc_pages(hw, blk)) { | |
eb4698f3 | 384 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 385 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
386 | return NULL; |
387 | } | |
388 | snd_emu10k1_memblk_map(hw, blk); | |
62932df8 | 389 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 390 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
391 | } |
392 | ||
2dd31dee | 393 | EXPORT_SYMBOL(snd_emu10k1_synth_alloc); |
1da177e4 LT |
394 | |
395 | /* | |
396 | * free a synth sample area | |
397 | */ | |
398 | int | |
eb4698f3 | 399 | snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) |
1da177e4 | 400 | { |
eb4698f3 TI |
401 | struct snd_util_memhdr *hdr = emu->memhdr; |
402 | struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; | |
1da177e4 LT |
403 | unsigned long flags; |
404 | ||
62932df8 | 405 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
406 | spin_lock_irqsave(&emu->memblk_lock, flags); |
407 | if (blk->mapped_page >= 0) | |
408 | unmap_memblk(emu, blk); | |
409 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
410 | synth_free_pages(emu, blk); | |
411 | __snd_util_mem_free(hdr, memblk); | |
62932df8 | 412 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
413 | return 0; |
414 | } | |
415 | ||
2dd31dee | 416 | EXPORT_SYMBOL(snd_emu10k1_synth_free); |
1da177e4 LT |
417 | |
418 | /* check new allocation range */ | |
eb4698f3 TI |
419 | static void get_single_page_range(struct snd_util_memhdr *hdr, |
420 | struct snd_emu10k1_memblk *blk, | |
421 | int *first_page_ret, int *last_page_ret) | |
1da177e4 LT |
422 | { |
423 | struct list_head *p; | |
eb4698f3 | 424 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
425 | int first_page, last_page; |
426 | first_page = blk->first_page; | |
427 | if ((p = blk->mem.list.prev) != &hdr->block) { | |
428 | q = get_emu10k1_memblk(p, mem.list); | |
429 | if (q->last_page == first_page) | |
430 | first_page++; /* first page was already allocated */ | |
431 | } | |
432 | last_page = blk->last_page; | |
433 | if ((p = blk->mem.list.next) != &hdr->block) { | |
434 | q = get_emu10k1_memblk(p, mem.list); | |
435 | if (q->first_page == last_page) | |
436 | last_page--; /* last page was already allocated */ | |
437 | } | |
438 | *first_page_ret = first_page; | |
439 | *last_page_ret = last_page; | |
440 | } | |
441 | ||
a5003fc0 TI |
442 | /* release allocated pages */ |
443 | static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, | |
444 | int last_page) | |
445 | { | |
446 | int page; | |
447 | ||
448 | for (page = first_page; page <= last_page; page++) { | |
449 | free_page((unsigned long)emu->page_ptr_table[page]); | |
450 | emu->page_addr_table[page] = 0; | |
451 | emu->page_ptr_table[page] = NULL; | |
452 | } | |
453 | } | |
454 | ||
1da177e4 LT |
455 | /* |
456 | * allocate kernel pages | |
457 | */ | |
eb4698f3 | 458 | static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
459 | { |
460 | int page, first_page, last_page; | |
1da177e4 LT |
461 | |
462 | emu10k1_memblk_init(blk); | |
463 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
464 | /* allocate kernel pages */ | |
465 | for (page = first_page; page <= last_page; page++) { | |
a5003fc0 TI |
466 | /* first try to allocate from <4GB zone */ |
467 | struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | | |
468 | __GFP_NOWARN); | |
9f515b68 | 469 | if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { |
28437305 TI |
470 | if (p) |
471 | __free_page(p); | |
a5003fc0 | 472 | /* try to allocate from <16MB zone */ |
28437305 | 473 | p = alloc_page(GFP_ATOMIC | GFP_DMA | |
a5003fc0 TI |
474 | __GFP_NORETRY | /* no OOM-killer */ |
475 | __GFP_NOWARN); | |
9f515b68 | 476 | } |
a5003fc0 TI |
477 | if (!p) { |
478 | __synth_free_pages(emu, first_page, page - 1); | |
479 | return -ENOMEM; | |
1da177e4 | 480 | } |
a5003fc0 TI |
481 | emu->page_addr_table[page] = page_to_phys(p); |
482 | emu->page_ptr_table[page] = page_address(p); | |
1da177e4 LT |
483 | } |
484 | return 0; | |
1da177e4 LT |
485 | } |
486 | ||
487 | /* | |
488 | * free pages | |
489 | */ | |
eb4698f3 | 490 | static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 | 491 | { |
a5003fc0 | 492 | int first_page, last_page; |
1da177e4 LT |
493 | |
494 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
a5003fc0 | 495 | __synth_free_pages(emu, first_page, last_page); |
1da177e4 LT |
496 | return 0; |
497 | } | |
498 | ||
499 | /* calculate buffer pointer from offset address */ | |
eb4698f3 | 500 | static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
1da177e4 LT |
501 | { |
502 | char *ptr; | |
da3cec35 TI |
503 | if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) |
504 | return NULL; | |
1da177e4 LT |
505 | ptr = emu->page_ptr_table[page]; |
506 | if (! ptr) { | |
99b359ba | 507 | printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page); |
1da177e4 LT |
508 | return NULL; |
509 | } | |
510 | ptr += offset & (PAGE_SIZE - 1); | |
511 | return (void*)ptr; | |
512 | } | |
513 | ||
514 | /* | |
515 | * bzero(blk + offset, size) | |
516 | */ | |
eb4698f3 TI |
517 | int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
518 | int offset, int size) | |
1da177e4 LT |
519 | { |
520 | int page, nextofs, end_offset, temp, temp1; | |
521 | void *ptr; | |
eb4698f3 | 522 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
523 | |
524 | offset += blk->offset & (PAGE_SIZE - 1); | |
525 | end_offset = offset + size; | |
526 | page = get_aligned_page(offset); | |
527 | do { | |
528 | nextofs = aligned_page_offset(page + 1); | |
529 | temp = nextofs - offset; | |
530 | temp1 = end_offset - offset; | |
531 | if (temp1 < temp) | |
532 | temp = temp1; | |
533 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
534 | if (ptr) | |
535 | memset(ptr, 0, temp); | |
536 | offset = nextofs; | |
537 | page++; | |
538 | } while (offset < end_offset); | |
539 | return 0; | |
540 | } | |
541 | ||
2dd31dee TI |
542 | EXPORT_SYMBOL(snd_emu10k1_synth_bzero); |
543 | ||
1da177e4 LT |
544 | /* |
545 | * copy_from_user(blk + offset, data, size) | |
546 | */ | |
eb4698f3 TI |
547 | int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, |
548 | int offset, const char __user *data, int size) | |
1da177e4 LT |
549 | { |
550 | int page, nextofs, end_offset, temp, temp1; | |
551 | void *ptr; | |
eb4698f3 | 552 | struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; |
1da177e4 LT |
553 | |
554 | offset += blk->offset & (PAGE_SIZE - 1); | |
555 | end_offset = offset + size; | |
556 | page = get_aligned_page(offset); | |
557 | do { | |
558 | nextofs = aligned_page_offset(page + 1); | |
559 | temp = nextofs - offset; | |
560 | temp1 = end_offset - offset; | |
561 | if (temp1 < temp) | |
562 | temp = temp1; | |
563 | ptr = offset_ptr(emu, page + p->first_page, offset); | |
564 | if (ptr && copy_from_user(ptr, data, temp)) | |
565 | return -EFAULT; | |
566 | offset = nextofs; | |
567 | data += temp; | |
568 | page++; | |
569 | } while (offset < end_offset); | |
570 | return 0; | |
571 | } | |
2dd31dee TI |
572 | |
573 | EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); |