1/* 2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 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 24#include <linux/pci.h> 25#include <linux/gfp.h> 26#include <linux/time.h> 27#include <linux/mutex.h> 28#include <linux/export.h> 29 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) << (emu->address_mode)) | (page))) 38 39#define UNIT_PAGES (PAGE_SIZE / EMUPAGESIZE) 40#define MAX_ALIGN_PAGES0 (MAXPAGES0 / UNIT_PAGES) 41#define MAX_ALIGN_PAGES1 (MAXPAGES1 / UNIT_PAGES) 42/* get aligned page from offset address */ 43#define get_aligned_page(offset) ((offset) >> PAGE_SHIFT) 44/* get offset address from aligned page */ 45#define aligned_page_offset(page) ((page) << PAGE_SHIFT) 46 47#if PAGE_SIZE == 4096 48/* page size == EMUPAGESIZE */ 49/* fill PTB entrie(s) corresponding to page with addr */ 50#define set_ptb_entry(emu,page,addr) __set_ptb_entry(emu,page,addr) 51/* fill PTB entrie(s) corresponding to page with silence pointer */ 52#define set_silent_ptb(emu,page) __set_ptb_entry(emu,page,emu->silent_page.addr) 53#else 54/* fill PTB entries -- we need to fill UNIT_PAGES entries */ 55static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr) 56{ 57 int i; 58 page *= UNIT_PAGES; 59 for (i = 0; i < UNIT_PAGES; i++, page++) { 60 __set_ptb_entry(emu, page, addr); 61 addr += EMUPAGESIZE; 62 } 63} 64static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page) 65{ 66 int i; 67 page *= UNIT_PAGES; 68 for (i = 0; i < UNIT_PAGES; i++, page++) 69 /* do not increment ptr */ 70 __set_ptb_entry(emu, page, emu->silent_page.addr); 71} 72#endif /* PAGE_SIZE */ 73 74 75/* 76 */ 77static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); 78static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk); 79 80#define get_emu10k1_memblk(l,member) list_entry(l, struct snd_emu10k1_memblk, member) 81 82 83/* initialize emu10k1 part */ 84static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk) 85{ 86 blk->mapped_page = -1; 87 INIT_LIST_HEAD(&blk->mapped_link); 88 INIT_LIST_HEAD(&blk->mapped_order_link); 89 blk->map_locked = 0; 90 91 blk->first_page = get_aligned_page(blk->mem.offset); 92 blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1); 93 blk->pages = blk->last_page - blk->first_page + 1; 94} 95 96/* 97 * search empty region on PTB with the given size 98 * 99 * if an empty region is found, return the page and store the next mapped block 100 * in nextp 101 * if not found, return a negative error code. 102 */ 103static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp) 104{ 105 int page = 0, found_page = -ENOMEM; 106 int max_size = npages; 107 int size; 108 struct list_head *candidate = &emu->mapped_link_head; 109 struct list_head *pos; 110 111 list_for_each (pos, &emu->mapped_link_head) { 112 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link); 113 if (blk->mapped_page < 0) 114 continue; 115 size = blk->mapped_page - page; 116 if (size == npages) { 117 *nextp = pos; 118 return page; 119 } 120 else if (size > max_size) { 121 /* we look for the maximum empty hole */ 122 max_size = size; 123 candidate = pos; 124 found_page = page; 125 } 126 page = blk->mapped_page + blk->pages; 127 } 128 size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page; 129 if (size >= max_size) { 130 *nextp = pos; 131 return page; 132 } 133 *nextp = candidate; 134 return found_page; 135} 136 137/* 138 * map a memory block onto emu10k1's PTB 139 * 140 * call with memblk_lock held 141 */ 142static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) 143{ 144 int page, pg; 145 struct list_head *next; 146 147 page = search_empty_map_area(emu, blk->pages, &next); 148 if (page < 0) /* not found */ 149 return page; 150 /* insert this block in the proper position of mapped list */ 151 list_add_tail(&blk->mapped_link, next); 152 /* append this as a newest block in order list */ 153 list_add_tail(&blk->mapped_order_link, &emu->mapped_order_link_head); 154 blk->mapped_page = page; 155 /* fill PTB */ 156 for (pg = blk->first_page; pg <= blk->last_page; pg++) { 157 set_ptb_entry(emu, page, emu->page_addr_table[pg]); 158 page++; 159 } 160 return 0; 161} 162 163/* 164 * unmap the block 165 * return the size of resultant empty pages 166 * 167 * call with memblk_lock held 168 */ 169static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) 170{ 171 int start_page, end_page, mpage, pg; 172 struct list_head *p; 173 struct snd_emu10k1_memblk *q; 174 175 /* calculate the expected size of empty region */ 176 if ((p = blk->mapped_link.prev) != &emu->mapped_link_head) { 177 q = get_emu10k1_memblk(p, mapped_link); 178 start_page = q->mapped_page + q->pages; 179 } else 180 start_page = 0; 181 if ((p = blk->mapped_link.next) != &emu->mapped_link_head) { 182 q = get_emu10k1_memblk(p, mapped_link); 183 end_page = q->mapped_page; 184 } else 185 end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0); 186 187 /* remove links */ 188 list_del(&blk->mapped_link); 189 list_del(&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, 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 */ 205static struct snd_emu10k1_memblk * 206search_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(emu->memhdr, psize << PAGE_SHIFT, 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 */ 237static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr) 238{ 239 if (addr & ~emu->dma_mask) { 240 dev_err(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(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 */ 258int 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(&blk->mapped_order_link, 270 &emu->mapped_order_link_head); 271 spin_unlock_irqrestore(&emu->memblk_lock, flags); 272 return 0; 273 } 274 if ((err = map_memblk(emu, blk)) < 0) { 275 /* no enough page - try to unmap some blocks */ 276 /* starting from the oldest block */ 277 p = emu->mapped_order_link_head.next; 278 for (; p != &emu->mapped_order_link_head; p = nextp) { 279 nextp = p->next; 280 deleted = get_emu10k1_memblk(p, mapped_order_link); 281 if (deleted->map_locked) 282 continue; 283 size = unmap_memblk(emu, deleted); 284 if (size >= blk->pages) { 285 /* ok the empty region is enough large */ 286 err = map_memblk(emu, blk); 287 break; 288 } 289 } 290 } 291 spin_unlock_irqrestore(&emu->memblk_lock, flags); 292 return err; 293} 294 295EXPORT_SYMBOL(snd_emu10k1_memblk_map); 296 297/* 298 * page allocation for DMA 299 */ 300struct snd_util_memblk * 301snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream) 302{ 303 struct snd_pcm_runtime *runtime = substream->runtime; 304 struct snd_util_memhdr *hdr; 305 struct snd_emu10k1_memblk *blk; 306 int page, err, idx; 307 308 if (snd_BUG_ON(!emu)) 309 return NULL; 310 if (snd_BUG_ON(runtime->dma_bytes <= 0 || 311 runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE)) 312 return NULL; 313 hdr = emu->memhdr; 314 if (snd_BUG_ON(!hdr)) 315 return NULL; 316 317 idx = runtime->period_size >= runtime->buffer_size ? 318 (emu->delay_pcm_irq * 2) : 0; 319 mutex_lock(&hdr->block_mutex); 320 blk = search_empty(emu, runtime->dma_bytes + idx); 321 if (blk == NULL) { 322 mutex_unlock(&hdr->block_mutex); 323 return NULL; 324 } 325 /* fill buffer addresses but pointers are not stored so that 326 * snd_free_pci_page() is not called in in synth_free() 327 */ 328 idx = 0; 329 for (page = blk->first_page; page <= blk->last_page; page++, idx++) { 330 unsigned long ofs = idx << PAGE_SHIFT; 331 dma_addr_t addr; 332 if (ofs >= runtime->dma_bytes) 333 addr = emu->silent_page.addr; 334 else 335 addr = snd_pcm_sgbuf_get_addr(substream, ofs); 336 if (! is_valid_page(emu, addr)) { 337 dev_err(emu->card->dev, 338 "emu: failure page = %d\n", idx); 339 mutex_unlock(&hdr->block_mutex); 340 return NULL; 341 } 342 emu->page_addr_table[page] = addr; 343 emu->page_ptr_table[page] = NULL; 344 } 345 346 /* set PTB entries */ 347 blk->map_locked = 1; /* do not unmap this block! */ 348 err = snd_emu10k1_memblk_map(emu, blk); 349 if (err < 0) { 350 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); 351 mutex_unlock(&hdr->block_mutex); 352 return NULL; 353 } 354 mutex_unlock(&hdr->block_mutex); 355 return (struct snd_util_memblk *)blk; 356} 357 358 359/* 360 * release DMA buffer from page table 361 */ 362int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk) 363{ 364 if (snd_BUG_ON(!emu || !blk)) 365 return -EINVAL; 366 return snd_emu10k1_synth_free(emu, blk); 367} 368 369 370/* 371 * memory allocation using multiple pages (for synth) 372 * Unlike the DMA allocation above, non-contiguous pages are assined. 373 */ 374 375/* 376 * allocate a synth sample area 377 */ 378struct snd_util_memblk * 379snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size) 380{ 381 struct snd_emu10k1_memblk *blk; 382 struct snd_util_memhdr *hdr = hw->memhdr; 383 384 mutex_lock(&hdr->block_mutex); 385 blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size); 386 if (blk == NULL) { 387 mutex_unlock(&hdr->block_mutex); 388 return NULL; 389 } 390 if (synth_alloc_pages(hw, blk)) { 391 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk); 392 mutex_unlock(&hdr->block_mutex); 393 return NULL; 394 } 395 snd_emu10k1_memblk_map(hw, blk); 396 mutex_unlock(&hdr->block_mutex); 397 return (struct snd_util_memblk *)blk; 398} 399 400EXPORT_SYMBOL(snd_emu10k1_synth_alloc); 401 402/* 403 * free a synth sample area 404 */ 405int 406snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk) 407{ 408 struct snd_util_memhdr *hdr = emu->memhdr; 409 struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk; 410 unsigned long flags; 411 412 mutex_lock(&hdr->block_mutex); 413 spin_lock_irqsave(&emu->memblk_lock, flags); 414 if (blk->mapped_page >= 0) 415 unmap_memblk(emu, blk); 416 spin_unlock_irqrestore(&emu->memblk_lock, flags); 417 synth_free_pages(emu, blk); 418 __snd_util_mem_free(hdr, memblk); 419 mutex_unlock(&hdr->block_mutex); 420 return 0; 421} 422 423EXPORT_SYMBOL(snd_emu10k1_synth_free); 424 425/* check new allocation range */ 426static void get_single_page_range(struct snd_util_memhdr *hdr, 427 struct snd_emu10k1_memblk *blk, 428 int *first_page_ret, int *last_page_ret) 429{ 430 struct list_head *p; 431 struct snd_emu10k1_memblk *q; 432 int first_page, last_page; 433 first_page = blk->first_page; 434 if ((p = blk->mem.list.prev) != &hdr->block) { 435 q = get_emu10k1_memblk(p, mem.list); 436 if (q->last_page == first_page) 437 first_page++; /* first page was already allocated */ 438 } 439 last_page = blk->last_page; 440 if ((p = blk->mem.list.next) != &hdr->block) { 441 q = get_emu10k1_memblk(p, mem.list); 442 if (q->first_page == last_page) 443 last_page--; /* last page was already allocated */ 444 } 445 *first_page_ret = first_page; 446 *last_page_ret = last_page; 447} 448 449/* release allocated pages */ 450static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page, 451 int last_page) 452{ 453 int page; 454 455 for (page = first_page; page <= last_page; page++) { 456 free_page((unsigned long)emu->page_ptr_table[page]); 457 emu->page_addr_table[page] = 0; 458 emu->page_ptr_table[page] = NULL; 459 } 460} 461 462/* 463 * allocate kernel pages 464 */ 465static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) 466{ 467 int page, first_page, last_page; 468 469 emu10k1_memblk_init(blk); 470 get_single_page_range(emu->memhdr, blk, &first_page, &last_page); 471 /* allocate kernel pages */ 472 for (page = first_page; page <= last_page; page++) { 473 /* first try to allocate from <4GB zone */ 474 struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 | 475 __GFP_NOWARN); 476 if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) { 477 if (p) 478 __free_page(p); 479 /* try to allocate from <16MB zone */ 480 p = alloc_page(GFP_ATOMIC | GFP_DMA | 481 __GFP_NORETRY | /* no OOM-killer */ 482 __GFP_NOWARN); 483 } 484 if (!p) { 485 __synth_free_pages(emu, first_page, page - 1); 486 return -ENOMEM; 487 } 488 emu->page_addr_table[page] = page_to_phys(p); 489 emu->page_ptr_table[page] = page_address(p); 490 } 491 return 0; 492} 493 494/* 495 * free pages 496 */ 497static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk) 498{ 499 int first_page, last_page; 500 501 get_single_page_range(emu->memhdr, blk, &first_page, &last_page); 502 __synth_free_pages(emu, first_page, last_page); 503 return 0; 504} 505 506/* calculate buffer pointer from offset address */ 507static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset) 508{ 509 char *ptr; 510 if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages)) 511 return NULL; 512 ptr = emu->page_ptr_table[page]; 513 if (! ptr) { 514 dev_err(emu->card->dev, 515 "access to NULL ptr: page = %d\n", page); 516 return NULL; 517 } 518 ptr += offset & (PAGE_SIZE - 1); 519 return (void*)ptr; 520} 521 522/* 523 * bzero(blk + offset, size) 524 */ 525int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, 526 int offset, int size) 527{ 528 int page, nextofs, end_offset, temp, temp1; 529 void *ptr; 530 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; 531 532 offset += blk->offset & (PAGE_SIZE - 1); 533 end_offset = offset + size; 534 page = get_aligned_page(offset); 535 do { 536 nextofs = aligned_page_offset(page + 1); 537 temp = nextofs - offset; 538 temp1 = end_offset - offset; 539 if (temp1 < temp) 540 temp = temp1; 541 ptr = offset_ptr(emu, page + p->first_page, offset); 542 if (ptr) 543 memset(ptr, 0, temp); 544 offset = nextofs; 545 page++; 546 } while (offset < end_offset); 547 return 0; 548} 549 550EXPORT_SYMBOL(snd_emu10k1_synth_bzero); 551 552/* 553 * copy_from_user(blk + offset, data, size) 554 */ 555int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk, 556 int offset, const char __user *data, int size) 557{ 558 int page, nextofs, end_offset, temp, temp1; 559 void *ptr; 560 struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk; 561 562 offset += blk->offset & (PAGE_SIZE - 1); 563 end_offset = offset + size; 564 page = get_aligned_page(offset); 565 do { 566 nextofs = aligned_page_offset(page + 1); 567 temp = nextofs - offset; 568 temp1 = end_offset - offset; 569 if (temp1 < temp) 570 temp = temp1; 571 ptr = offset_ptr(emu, page + p->first_page, offset); 572 if (ptr && copy_from_user(ptr, data, temp)) 573 return -EFAULT; 574 offset = nextofs; 575 data += temp; 576 page++; 577 } while (offset < end_offset); 578 return 0; 579} 580 581EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user); 582