sound/pci/emu10k1/memory.c

   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/time.h>
  26 #include <linux/mutex.h>
  27
  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 */
  52 static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
  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 }
  61 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
  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  */
  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);
  76
  77 #define get_emu10k1_memblk(l,member)    list_entry(l, struct snd_emu10k1_memblk, member)
  78
  79
  80 /* initialize emu10k1 part */
  81 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
  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  */
 100 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
 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) {
 109                 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
 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  */
 138 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 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  */
 165 static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 166 {
 167         int start_page, end_page, mpage, pg;
 168         struct list_head *p;
 169         struct snd_emu10k1_memblk *q;
 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  */
 201 static struct snd_emu10k1_memblk *
 202 search_empty(struct snd_emu10k1 *emu, int size)
 203 {
 204         struct list_head *p;
 205         struct snd_emu10k1_memblk *blk;
 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 */
 221         blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
 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  */
 233 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
 234 {
 235         if (addr & ~emu->dma_mask) {
 236                 snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
 237                 return 0;
 238         }
 239         if (addr & (EMUPAGESIZE-1)) {
 240                 snd_printk(KERN_ERR "page is not aligned\n");
 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  */
 252 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 253 {
 254         int err;
 255         int size;
 256         struct list_head *p, *nextp;
 257         struct snd_emu10k1_memblk *deleted;
 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
 289 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
 290
 291 /*
 292  * page allocation for DMA
 293  */
 294 struct snd_util_memblk *
 295 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
 296 {
 297         struct snd_pcm_runtime *runtime = substream->runtime;
 298         struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
 299         struct snd_util_memhdr *hdr;
 300         struct snd_emu10k1_memblk *blk;
 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
 308         mutex_lock(&hdr->block_mutex);
 309         blk = search_empty(emu, runtime->dma_bytes);
 310         if (blk == NULL) {
 311                 mutex_unlock(&hdr->block_mutex);
 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);
 324                         mutex_unlock(&hdr->block_mutex);
 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);
 331                         mutex_unlock(&hdr->block_mutex);
 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) {
 342                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 343                 mutex_unlock(&hdr->block_mutex);
 344                 return NULL;
 345         }
 346         mutex_unlock(&hdr->block_mutex);
 347         return (struct snd_util_memblk *)blk;
 348 }
 349
 350
 351 /*
 352  * release DMA buffer from page table
 353  */
 354 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
 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  */
 369 struct snd_util_memblk *
 370 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
 371 {
 372         struct snd_emu10k1_memblk *blk;
 373         struct snd_util_memhdr *hdr = hw->memhdr;
 374
 375         mutex_lock(&hdr->block_mutex);
 376         blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
 377         if (blk == NULL) {
 378                 mutex_unlock(&hdr->block_mutex);
 379                 return NULL;
 380         }
 381         if (synth_alloc_pages(hw, blk)) {
 382                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 383                 mutex_unlock(&hdr->block_mutex);
 384                 return NULL;
 385         }
 386         snd_emu10k1_memblk_map(hw, blk);
 387         mutex_unlock(&hdr->block_mutex);
 388         return (struct snd_util_memblk *)blk;
 389 }
 390
 391 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
 392
 393 /*
 394  * free a synth sample area
 395  */
 396 int
 397 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
 398 {
 399         struct snd_util_memhdr *hdr = emu->memhdr;
 400         struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
 401         unsigned long flags;
 402
 403         mutex_lock(&hdr->block_mutex);
 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);
 410         mutex_unlock(&hdr->block_mutex);
 411         return 0;
 412 }
 413
 414 EXPORT_SYMBOL(snd_emu10k1_synth_free);
 415
 416 /* check new allocation range */
 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)
 420 {
 421         struct list_head *p;
 422         struct snd_emu10k1_memblk *q;
 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  */
 443 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 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  */
 482 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 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 */
 505 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
 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) {
 511                 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
 512                 return NULL;
 513         }
 514         ptr += offset & (PAGE_SIZE - 1);
 515         return (void*)ptr;
 516 }
 517
 518 /*
 519  * bzero(blk + offset, size)
 520  */
 521 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
 522                             int offset, int size)
 523 {
 524         int page, nextofs, end_offset, temp, temp1;
 525         void *ptr;
 526         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 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
 546 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
 547
 548 /*
 549  * copy_from_user(blk + offset, data, size)
 550  */
 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)
 553 {
 554         int page, nextofs, end_offset, temp, temp1;
 555         void *ptr;
 556         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 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 }
 576
 577 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);