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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 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); |
da3cec35 TI |
110 | if (blk->mapped_page < 0) |
111 | continue; | |
1da177e4 LT |
112 | size = blk->mapped_page - page; |
113 | if (size == npages) { | |
114 | *nextp = pos; | |
115 | return page; | |
116 | } | |
117 | else if (size > max_size) { | |
118 | /* we look for the maximum empty hole */ | |
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 | * map a memory block onto emu10k1's PTB | |
136 | * | |
137 | * call with memblk_lock held | |
138 | */ | |
eb4698f3 | 139 | static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
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) /* not found */ | |
146 | return page; | |
147 | /* insert this block in the proper position of mapped list */ | |
148 | list_add_tail(&blk->mapped_link, next); | |
149 | /* append this as a newest block in order list */ | |
150 | list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); | |
151 | blk->mapped_page = page; | |
152 | /* fill PTB */ | |
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 | * unmap the block | |
162 | * return the size of resultant empty pages | |
163 | * | |
164 | * call with memblk_lock held | |
165 | */ | |
eb4698f3 | 166 | static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
167 | { |
168 | int start_page, end_page, mpage, pg; | |
169 | struct list_head *p; | |
eb4698f3 | 170 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
171 | |
172 | /* calculate the expected size of empty region */ | |
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 | /* remove links */ | |
185 | list_del(&blk->mapped_link); | |
186 | list_del(&blk->mapped_order_link); | |
187 | /* clear PTB */ | |
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; /* return the new empty size */ | |
195 | } | |
196 | ||
197 | /* | |
198 | * search empty pages with the given size, and create a memory block | |
199 | * | |
200 | * unlike synth_alloc the memory block is aligned to the page start | |
201 | */ | |
eb4698f3 TI |
202 | static struct snd_emu10k1_memblk * |
203 | search_empty(struct snd_emu10k1 *emu, int size) | |
1da177e4 LT |
204 | { |
205 | struct list_head *p; | |
eb4698f3 | 206 | struct snd_emu10k1_memblk *blk; |
1da177e4 LT |
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 | /* create a new memory block */ | |
eb4698f3 | 222 | blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev); |
1da177e4 LT |
223 | if (blk == NULL) |
224 | return NULL; | |
225 | blk->mem.offset = aligned_page_offset(page); /* set aligned offset */ | |
226 | emu10k1_memblk_init(blk); | |
227 | return blk; | |
228 | } | |
229 | ||
230 | ||
231 | /* | |
232 | * check if the given pointer is valid for pages | |
233 | */ | |
eb4698f3 | 234 | static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) |
1da177e4 LT |
235 | { |
236 | if (addr & ~emu->dma_mask) { | |
99b359ba | 237 | snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr); |
1da177e4 LT |
238 | return 0; |
239 | } | |
240 | if (addr & (EMUPAGESIZE-1)) { | |
99b359ba | 241 | snd_printk(KERN_ERR "page is not aligned\n"); |
1da177e4 LT |
242 | return 0; |
243 | } | |
244 | return 1; | |
245 | } | |
246 | ||
247 | /* | |
248 | * map the given memory block on PTB. | |
249 | * if the block is already mapped, update the link order. | |
250 | * if no empty pages are found, tries to release unsed memory blocks | |
251 | * and retry the mapping. | |
252 | */ | |
eb4698f3 | 253 | int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
254 | { |
255 | int err; | |
256 | int size; | |
257 | struct list_head *p, *nextp; | |
eb4698f3 | 258 | struct snd_emu10k1_memblk *deleted; |
1da177e4 LT |
259 | unsigned long flags; |
260 | ||
261 | spin_lock_irqsave(&emu->memblk_lock, flags); | |
262 | if (blk->mapped_page >= 0) { | |
263 | /* update order link */ | |
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 | /* no enough page - try to unmap some blocks */ | |
271 | /* starting from the oldest block */ | |
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 | /* ok the empty region is enough large */ | |
281 | err = map_memblk(emu, blk); | |
282 | break; | |
283 | } | |
284 | } | |
285 | } | |
286 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
287 | return err; | |
288 | } | |
289 | ||
2dd31dee TI |
290 | EXPORT_SYMBOL(snd_emu10k1_memblk_map); |
291 | ||
1da177e4 LT |
292 | /* |
293 | * page allocation for DMA | |
294 | */ | |
eb4698f3 TI |
295 | struct snd_util_memblk * |
296 | snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) | |
1da177e4 | 297 | { |
eb4698f3 | 298 | struct snd_pcm_runtime *runtime = substream->runtime; |
1da177e4 | 299 | struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream); |
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 | |
62932df8 | 313 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
314 | blk = search_empty(emu, runtime->dma_bytes); |
315 | if (blk == NULL) { | |
62932df8 | 316 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
317 | return NULL; |
318 | } | |
319 | /* fill buffer addresses but pointers are not stored so that | |
320 | * snd_free_pci_page() is not called in in synth_free() | |
321 | */ | |
322 | idx = 0; | |
323 | for (page = blk->first_page; page <= blk->last_page; page++, idx++) { | |
324 | dma_addr_t addr; | |
325 | #ifdef CONFIG_SND_DEBUG | |
326 | if (idx >= sgbuf->pages) { | |
327 | printk(KERN_ERR "emu: pages overflow! (%d-%d) for %d\n", | |
328 | blk->first_page, blk->last_page, sgbuf->pages); | |
62932df8 | 329 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
330 | return NULL; |
331 | } | |
332 | #endif | |
333 | addr = sgbuf->table[idx].addr; | |
334 | if (! is_valid_page(emu, addr)) { | |
335 | printk(KERN_ERR "emu: failure page = %d\n", idx); | |
62932df8 | 336 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
337 | return NULL; |
338 | } | |
339 | emu->page_addr_table[page] = addr; | |
340 | emu->page_ptr_table[page] = NULL; | |
341 | } | |
342 | ||
343 | /* set PTB entries */ | |
344 | blk->map_locked = 1; /* do not unmap this block! */ | |
345 | err = snd_emu10k1_memblk_map(emu, blk); | |
346 | if (err < 0) { | |
eb4698f3 | 347 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 348 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
349 | return NULL; |
350 | } | |
62932df8 | 351 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 352 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
353 | } |
354 | ||
355 | ||
356 | /* | |
357 | * release DMA buffer from page table | |
358 | */ | |
eb4698f3 | 359 | int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) |
1da177e4 | 360 | { |
da3cec35 TI |
361 | if (snd_BUG_ON(!emu || !blk)) |
362 | return -EINVAL; | |
1da177e4 LT |
363 | return snd_emu10k1_synth_free(emu, blk); |
364 | } | |
365 | ||
366 | ||
367 | /* | |
368 | * memory allocation using multiple pages (for synth) | |
369 | * Unlike the DMA allocation above, non-contiguous pages are assined. | |
370 | */ | |
371 | ||
372 | /* | |
373 | * allocate a synth sample area | |
374 | */ | |
eb4698f3 TI |
375 | struct snd_util_memblk * |
376 | snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) | |
1da177e4 | 377 | { |
eb4698f3 TI |
378 | struct snd_emu10k1_memblk *blk; |
379 | struct snd_util_memhdr *hdr = hw->memhdr; | |
1da177e4 | 380 | |
62932df8 | 381 | mutex_lock(&hdr->block_mutex); |
eb4698f3 | 382 | blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); |
1da177e4 | 383 | if (blk == NULL) { |
62932df8 | 384 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
385 | return NULL; |
386 | } | |
387 | if (synth_alloc_pages(hw, blk)) { | |
eb4698f3 | 388 | __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); |
62932df8 | 389 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
390 | return NULL; |
391 | } | |
392 | snd_emu10k1_memblk_map(hw, blk); | |
62932df8 | 393 | mutex_unlock(&hdr->block_mutex); |
eb4698f3 | 394 | return (struct snd_util_memblk *)blk; |
1da177e4 LT |
395 | } |
396 | ||
2dd31dee | 397 | EXPORT_SYMBOL(snd_emu10k1_synth_alloc); |
1da177e4 LT |
398 | |
399 | /* | |
400 | * free a synth sample area | |
401 | */ | |
402 | int | |
eb4698f3 | 403 | snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) |
1da177e4 | 404 | { |
eb4698f3 TI |
405 | struct snd_util_memhdr *hdr = emu->memhdr; |
406 | struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; | |
1da177e4 LT |
407 | unsigned long flags; |
408 | ||
62932df8 | 409 | mutex_lock(&hdr->block_mutex); |
1da177e4 LT |
410 | spin_lock_irqsave(&emu->memblk_lock, flags); |
411 | if (blk->mapped_page >= 0) | |
412 | unmap_memblk(emu, blk); | |
413 | spin_unlock_irqrestore(&emu->memblk_lock, flags); | |
414 | synth_free_pages(emu, blk); | |
415 | __snd_util_mem_free(hdr, memblk); | |
62932df8 | 416 | mutex_unlock(&hdr->block_mutex); |
1da177e4 LT |
417 | return 0; |
418 | } | |
419 | ||
2dd31dee | 420 | EXPORT_SYMBOL(snd_emu10k1_synth_free); |
1da177e4 LT |
421 | |
422 | /* check new allocation range */ | |
eb4698f3 TI |
423 | static void get_single_page_range(struct snd_util_memhdr *hdr, |
424 | struct snd_emu10k1_memblk *blk, | |
425 | int *first_page_ret, int *last_page_ret) | |
1da177e4 LT |
426 | { |
427 | struct list_head *p; | |
eb4698f3 | 428 | struct snd_emu10k1_memblk *q; |
1da177e4 LT |
429 | int first_page, last_page; |
430 | first_page = blk->first_page; | |
431 | if ((p = blk->mem.list.prev) != &hdr->block) { | |
432 | q = get_emu10k1_memblk(p, mem.list); | |
433 | if (q->last_page == first_page) | |
434 | first_page++; /* first page was already allocated */ | |
435 | } | |
436 | last_page = blk->last_page; | |
437 | if ((p = blk->mem.list.next) != &hdr->block) { | |
438 | q = get_emu10k1_memblk(p, mem.list); | |
439 | if (q->first_page == last_page) | |
440 | last_page--; /* last page was already allocated */ | |
441 | } | |
442 | *first_page_ret = first_page; | |
443 | *last_page_ret = last_page; | |
444 | } | |
445 | ||
a5003fc0 TI |
446 | /* release allocated pages */ |
447 | static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, | |
448 | int last_page) | |
449 | { | |
450 | int page; | |
451 | ||
452 | for (page = first_page; page <= last_page; page++) { | |
453 | free_page((unsigned long)emu->page_ptr_table[page]); | |
454 | emu->page_addr_table[page] = 0; | |
455 | emu->page_ptr_table[page] = NULL; | |
456 | } | |
457 | } | |
458 | ||
1da177e4 LT |
459 | /* |
460 | * allocate kernel pages | |
461 | */ | |
eb4698f3 | 462 | static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 LT |
463 | { |
464 | int page, first_page, last_page; | |
1da177e4 LT |
465 | |
466 | emu10k1_memblk_init(blk); | |
467 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
468 | /* allocate kernel pages */ | |
469 | for (page = first_page; page <= last_page; page++) { | |
a5003fc0 TI |
470 | /* first try to allocate from <4GB zone */ |
471 | struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | | |
472 | __GFP_NOWARN); | |
9f515b68 | 473 | if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { |
28437305 TI |
474 | if (p) |
475 | __free_page(p); | |
a5003fc0 | 476 | /* try to allocate from <16MB zone */ |
28437305 | 477 | p = alloc_page(GFP_ATOMIC | GFP_DMA | |
a5003fc0 TI |
478 | __GFP_NORETRY | /* no OOM-killer */ |
479 | __GFP_NOWARN); | |
9f515b68 | 480 | } |
a5003fc0 TI |
481 | if (!p) { |
482 | __synth_free_pages(emu, first_page, page - 1); | |
483 | return -ENOMEM; | |
1da177e4 | 484 | } |
a5003fc0 TI |
485 | emu->page_addr_table[page] = page_to_phys(p); |
486 | emu->page_ptr_table[page] = page_address(p); | |
1da177e4 LT |
487 | } |
488 | return 0; | |
1da177e4 LT |
489 | } |
490 | ||
491 | /* | |
492 | * free pages | |
493 | */ | |
eb4698f3 | 494 | static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) |
1da177e4 | 495 | { |
a5003fc0 | 496 | int first_page, last_page; |
1da177e4 LT |
497 | |
498 | get_single_page_range(emu->memhdr, blk, &first_page, &last_page); | |
a5003fc0 | 499 | __synth_free_pages(emu, first_page, last_page); |
1da177e4 LT |
500 | return 0; |
501 | } | |
502 | ||
503 | /* calculate buffer pointer from offset address */ | |
eb4698f3 | 504 | static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) |
1da177e4 LT |
505 | { |
506 | char *ptr; | |
da3cec35 TI |
507 | if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) |
508 | return NULL; | |
1da177e4 LT |
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); |