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/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) << 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 */
  54 static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
  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 }
  63 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
  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  */
  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);
  78
  79 #define get_emu10k1_memblk(l,member)    list_entry(l, struct snd_emu10k1_memblk, member)
  80
  81
  82 /* initialize emu10k1 part */
  83 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
  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  */
 102 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
 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) {
 111                 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
 112                 if (blk->mapped_page < 0)
 113                         continue;
 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  */
 141 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 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  */
 168 static int unmap_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 169 {
 170         int start_page, end_page, mpage, pg;
 171         struct list_head *p;
 172         struct snd_emu10k1_memblk *q;
 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  */
 204 static struct snd_emu10k1_memblk *
 205 search_empty(struct snd_emu10k1 *emu, int size)
 206 {
 207         struct list_head *p;
 208         struct snd_emu10k1_memblk *blk;
 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 */
 224         blk = (struct snd_emu10k1_memblk *)__snd_util_memblk_new(emu->memhdr, psize << PAGE_SHIFT, p->prev);
 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  */
 236 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
 237 {
 238         if (addr & ~emu->dma_mask) {
 239                 snd_printk(KERN_ERR "max memory size is 0x%lx (addr = 0x%lx)!!\n", emu->dma_mask, (unsigned long)addr);
 240                 return 0;
 241         }
 242         if (addr & (EMUPAGESIZE-1)) {
 243                 snd_printk(KERN_ERR "page is not aligned\n");
 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.
 252  * if no empty pages are found, tries to release unused memory blocks
 253  * and retry the mapping.
 254  */
 255 int snd_emu10k1_memblk_map(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 256 {
 257         int err;
 258         int size;
 259         struct list_head *p, *nextp;
 260         struct snd_emu10k1_memblk *deleted;
 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
 292 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
 293
 294 /*
 295  * page allocation for DMA
 296  */
 297 struct snd_util_memblk *
 298 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
 299 {
 300         struct snd_pcm_runtime *runtime = substream->runtime;
 301         struct snd_util_memhdr *hdr;
 302         struct snd_emu10k1_memblk *blk;
 303         int page, err, idx;
 304
 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;
 310         hdr = emu->memhdr;
 311         if (snd_BUG_ON(!hdr))
 312                 return NULL;
 313
 314         idx = runtime->period_size >= runtime->buffer_size ?
 315                                         (emu->delay_pcm_irq * 2) : 0;
 316         mutex_lock(&hdr->block_mutex);
 317         blk = search_empty(emu, runtime->dma_bytes + idx);
 318         if (blk == NULL) {
 319                 mutex_unlock(&hdr->block_mutex);
 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++) {
 327                 unsigned long ofs = idx << PAGE_SHIFT;
 328                 dma_addr_t addr;
 329                 addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 330                 if (! is_valid_page(emu, addr)) {
 331                         printk(KERN_ERR "emu: failure page = %d\n", idx);
 332                         mutex_unlock(&hdr->block_mutex);
 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) {
 343                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 344                 mutex_unlock(&hdr->block_mutex);
 345                 return NULL;
 346         }
 347         mutex_unlock(&hdr->block_mutex);
 348         return (struct snd_util_memblk *)blk;
 349 }
 350
 351
 352 /*
 353  * release DMA buffer from page table
 354  */
 355 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
 356 {
 357         if (snd_BUG_ON(!emu || !blk))
 358                 return -EINVAL;
 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  */
 371 struct snd_util_memblk *
 372 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
 373 {
 374         struct snd_emu10k1_memblk *blk;
 375         struct snd_util_memhdr *hdr = hw->memhdr;
 376
 377         mutex_lock(&hdr->block_mutex);
 378         blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
 379         if (blk == NULL) {
 380                 mutex_unlock(&hdr->block_mutex);
 381                 return NULL;
 382         }
 383         if (synth_alloc_pages(hw, blk)) {
 384                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 385                 mutex_unlock(&hdr->block_mutex);
 386                 return NULL;
 387         }
 388         snd_emu10k1_memblk_map(hw, blk);
 389         mutex_unlock(&hdr->block_mutex);
 390         return (struct snd_util_memblk *)blk;
 391 }
 392
 393 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
 394
 395 /*
 396  * free a synth sample area
 397  */
 398 int
 399 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
 400 {
 401         struct snd_util_memhdr *hdr = emu->memhdr;
 402         struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
 403         unsigned long flags;
 404
 405         mutex_lock(&hdr->block_mutex);
 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);
 412         mutex_unlock(&hdr->block_mutex);
 413         return 0;
 414 }
 415
 416 EXPORT_SYMBOL(snd_emu10k1_synth_free);
 417
 418 /* check new allocation range */
 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)
 422 {
 423         struct list_head *p;
 424         struct snd_emu10k1_memblk *q;
 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
 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
 455 /*
 456  * allocate kernel pages
 457  */
 458 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 459 {
 460         int page, first_page, last_page;
 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++) {
 466                 /* first try to allocate from <4GB zone */
 467                 struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
 468                                             __GFP_NOWARN);
 469                 if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT))) {
 470                         if (p)
 471                                 __free_page(p);
 472                         /* try to allocate from <16MB zone */
 473                         p = alloc_page(GFP_ATOMIC | GFP_DMA |
 474                                        __GFP_NORETRY | /* no OOM-killer */
 475                                        __GFP_NOWARN);
 476                 }
 477                 if (!p) {
 478                         __synth_free_pages(emu, first_page, page - 1);
 479                         return -ENOMEM;
 480                 }
 481                 emu->page_addr_table[page] = page_to_phys(p);
 482                 emu->page_ptr_table[page] = page_address(p);
 483         }
 484         return 0;
 485 }
 486
 487 /*
 488  * free pages
 489  */
 490 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 491 {
 492         int first_page, last_page;
 493
 494         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
 495         __synth_free_pages(emu, first_page, last_page);
 496         return 0;
 497 }
 498
 499 /* calculate buffer pointer from offset address */
 500 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
 501 {
 502         char *ptr;
 503         if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
 504                 return NULL;
 505         ptr = emu->page_ptr_table[page];
 506         if (! ptr) {
 507                 printk(KERN_ERR "emu10k1: access to NULL ptr: page = %d\n", page);
 508                 return NULL;
 509         }
 510         ptr += offset & (PAGE_SIZE - 1);
 511         return (void*)ptr;
 512 }
 513
 514 /*
 515  * bzero(blk + offset, size)
 516  */
 517 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
 518                             int offset, int size)
 519 {
 520         int page, nextofs, end_offset, temp, temp1;
 521         void *ptr;
 522         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 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
 542 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
 543
 544 /*
 545  * copy_from_user(blk + offset, data, size)
 546  */
 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)
 549 {
 550         int page, nextofs, end_offset, temp, temp1;
 551         void *ptr;
 552         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 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 }
 572
 573 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);