sound/pci/emu10k1/memory.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   4  *  Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5  *
   6  *  EMU10K1 memory page allocation (PTB area)
   7  */
   8
   9 #include <linux/pci.h>
  10 #include <linux/gfp.h>
  11 #include <linux/time.h>
  12 #include <linux/mutex.h>
  13 #include <linux/export.h>
  14
  15 #include <sound/core.h>
  16 #include <sound/emu10k1.h>
  17
  18 /* page arguments of these two macros are Emu page (4096 bytes), not like
  19  * aligned pages in others
  20  */
  21 #define __set_ptb_entry(emu,page,addr) \
  22         (((__le32 *)(emu)->ptb_pages.area)[page] = \
  23          cpu_to_le32(((addr) << (emu->address_mode)) | (page)))
  24 #define __get_ptb_entry(emu, page) \
  25         (le32_to_cpu(((__le32 *)(emu)->ptb_pages.area)[page]))
  26
  27 #define UNIT_PAGES              (PAGE_SIZE / EMUPAGESIZE)
  28 #define MAX_ALIGN_PAGES0                (MAXPAGES0 / UNIT_PAGES)
  29 #define MAX_ALIGN_PAGES1                (MAXPAGES1 / UNIT_PAGES)
  30 /* get aligned page from offset address */
  31 #define get_aligned_page(offset)        ((offset) >> PAGE_SHIFT)
  32 /* get offset address from aligned page */
  33 #define aligned_page_offset(page)       ((page) << PAGE_SHIFT)
  34
  35 #if PAGE_SIZE == EMUPAGESIZE && !IS_ENABLED(CONFIG_DYNAMIC_DEBUG)
  36 /* fill PTB entrie(s) corresponding to page with addr */
  37 #define set_ptb_entry(emu,page,addr)    __set_ptb_entry(emu,page,addr)
  38 /* fill PTB entrie(s) corresponding to page with silence pointer */
  39 #define set_silent_ptb(emu,page)        __set_ptb_entry(emu,page,emu->silent_page.addr)
  40 #else
  41 /* fill PTB entries -- we need to fill UNIT_PAGES entries */
  42 static inline void set_ptb_entry(struct snd_emu10k1 *emu, int page, dma_addr_t addr)
  43 {
  44         int i;
  45         page *= UNIT_PAGES;
  46         for (i = 0; i < UNIT_PAGES; i++, page++) {
  47                 __set_ptb_entry(emu, page, addr);
  48                 dev_dbg(emu->card->dev, "mapped page %d to entry %.8x\n", page,
  49                         (unsigned int)__get_ptb_entry(emu, page));
  50                 addr += EMUPAGESIZE;
  51         }
  52 }
  53 static inline void set_silent_ptb(struct snd_emu10k1 *emu, int page)
  54 {
  55         int i;
  56         page *= UNIT_PAGES;
  57         for (i = 0; i < UNIT_PAGES; i++, page++) {
  58                 /* do not increment ptr */
  59                 __set_ptb_entry(emu, page, emu->silent_page.addr);
  60                 dev_dbg(emu->card->dev, "mapped silent page %d to entry %.8x\n",
  61                         page, (unsigned int)__get_ptb_entry(emu, page));
  62         }
  63 }
  64 #endif /* PAGE_SIZE */
  65
  66
  67 /*
  68  */
  69 static int synth_alloc_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
  70 static int synth_free_pages(struct snd_emu10k1 *hw, struct snd_emu10k1_memblk *blk);
  71
  72 #define get_emu10k1_memblk(l,member)    list_entry(l, struct snd_emu10k1_memblk, member)
  73
  74
  75 /* initialize emu10k1 part */
  76 static void emu10k1_memblk_init(struct snd_emu10k1_memblk *blk)
  77 {
  78         blk->mapped_page = -1;
  79         INIT_LIST_HEAD(&blk->mapped_link);
  80         INIT_LIST_HEAD(&blk->mapped_order_link);
  81         blk->map_locked = 0;
  82
  83         blk->first_page = get_aligned_page(blk->mem.offset);
  84         blk->last_page = get_aligned_page(blk->mem.offset + blk->mem.size - 1);
  85         blk->pages = blk->last_page - blk->first_page + 1;
  86 }
  87
  88 /*
  89  * search empty region on PTB with the given size
  90  *
  91  * if an empty region is found, return the page and store the next mapped block
  92  * in nextp
  93  * if not found, return a negative error code.
  94  */
  95 static int search_empty_map_area(struct snd_emu10k1 *emu, int npages, struct list_head **nextp)
  96 {
  97         int page = 1, found_page = -ENOMEM;
  98         int max_size = npages;
  99         int size;
 100         struct list_head *candidate = &emu->mapped_link_head;
 101         struct list_head *pos;
 102
 103         list_for_each (pos, &emu->mapped_link_head) {
 104                 struct snd_emu10k1_memblk *blk = get_emu10k1_memblk(pos, mapped_link);
 105                 if (blk->mapped_page < 0)
 106                         continue;
 107                 size = blk->mapped_page - page;
 108                 if (size == npages) {
 109                         *nextp = pos;
 110                         return page;
 111                 }
 112                 else if (size > max_size) {
 113                         /* we look for the maximum empty hole */
 114                         max_size = size;
 115                         candidate = pos;
 116                         found_page = page;
 117                 }
 118                 page = blk->mapped_page + blk->pages;
 119         }
 120         size = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0) - page;
 121         if (size >= max_size) {
 122                 *nextp = pos;
 123                 return page;
 124         }
 125         *nextp = candidate;
 126         return found_page;
 127 }
 128
 129 /*
 130  * map a memory block onto emu10k1's PTB
 131  *
 132  * call with memblk_lock held
 133  */
 134 static int map_memblk(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 135 {
 136         int page, pg;
 137         struct list_head *next;
 138
 139         page = search_empty_map_area(emu, blk->pages, &next);
 140         if (page < 0) /* not found */
 141                 return page;
 142         if (page == 0) {
 143                 dev_err(emu->card->dev, "trying to map zero (reserved) page\n");
 144                 return -EINVAL;
 145         }
 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         p = blk->mapped_link.prev;
 173         if (p != &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 = 1;
 178         }
 179         p = blk->mapped_link.next;
 180         if (p != &emu->mapped_link_head) {
 181                 q = get_emu10k1_memblk(p, mapped_link);
 182                 end_page = q->mapped_page;
 183         } else {
 184                 end_page = (emu->address_mode ? MAX_ALIGN_PAGES1 : MAX_ALIGN_PAGES0);
 185         }
 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  */
 205 static struct snd_emu10k1_memblk *
 206 search_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  */
 237 static int is_valid_page(struct snd_emu10k1 *emu, dma_addr_t addr)
 238 {
 239         if (addr & ~emu->dma_mask) {
 240                 dev_err_ratelimited(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_ratelimited(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  */
 258 int 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         err = map_memblk(emu, blk);
 275         if (err < 0) {
 276                 /* no enough page - try to unmap some blocks */
 277                 /* starting from the oldest block */
 278                 p = emu->mapped_order_link_head.next;
 279                 for (; p != &emu->mapped_order_link_head; p = nextp) {
 280                         nextp = p->next;
 281                         deleted = get_emu10k1_memblk(p, mapped_order_link);
 282                         if (deleted->map_locked)
 283                                 continue;
 284                         size = unmap_memblk(emu, deleted);
 285                         if (size >= blk->pages) {
 286                                 /* ok the empty region is enough large */
 287                                 err = map_memblk(emu, blk);
 288                                 break;
 289                         }
 290                 }
 291         }
 292         spin_unlock_irqrestore(&emu->memblk_lock, flags);
 293         return err;
 294 }
 295
 296 EXPORT_SYMBOL(snd_emu10k1_memblk_map);
 297
 298 /*
 299  * page allocation for DMA
 300  */
 301 struct snd_util_memblk *
 302 snd_emu10k1_alloc_pages(struct snd_emu10k1 *emu, struct snd_pcm_substream *substream)
 303 {
 304         struct snd_pcm_runtime *runtime = substream->runtime;
 305         struct snd_util_memhdr *hdr;
 306         struct snd_emu10k1_memblk *blk;
 307         int page, err, idx;
 308
 309         if (snd_BUG_ON(!emu))
 310                 return NULL;
 311         if (snd_BUG_ON(runtime->dma_bytes <= 0 ||
 312                        runtime->dma_bytes >= (emu->address_mode ? MAXPAGES1 : MAXPAGES0) * EMUPAGESIZE))
 313                 return NULL;
 314         hdr = emu->memhdr;
 315         if (snd_BUG_ON(!hdr))
 316                 return NULL;
 317
 318         idx = runtime->period_size >= runtime->buffer_size ?
 319                                         (emu->delay_pcm_irq * 2) : 0;
 320         mutex_lock(&hdr->block_mutex);
 321         blk = search_empty(emu, runtime->dma_bytes + idx);
 322         if (blk == NULL) {
 323                 mutex_unlock(&hdr->block_mutex);
 324                 return NULL;
 325         }
 326         /* fill buffer addresses but pointers are not stored so that
 327          * snd_free_pci_page() is not called in in synth_free()
 328          */
 329         idx = 0;
 330         for (page = blk->first_page; page <= blk->last_page; page++, idx++) {
 331                 unsigned long ofs = idx << PAGE_SHIFT;
 332                 dma_addr_t addr;
 333                 if (ofs >= runtime->dma_bytes)
 334                         addr = emu->silent_page.addr;
 335                 else
 336                         addr = snd_pcm_sgbuf_get_addr(substream, ofs);
 337                 if (! is_valid_page(emu, addr)) {
 338                         dev_err_ratelimited(emu->card->dev,
 339                                 "emu: failure page = %d\n", idx);
 340                         mutex_unlock(&hdr->block_mutex);
 341                         return NULL;
 342                 }
 343                 emu->page_addr_table[page] = addr;
 344                 emu->page_ptr_table[page] = NULL;
 345         }
 346
 347         /* set PTB entries */
 348         blk->map_locked = 1; /* do not unmap this block! */
 349         err = snd_emu10k1_memblk_map(emu, blk);
 350         if (err < 0) {
 351                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 352                 mutex_unlock(&hdr->block_mutex);
 353                 return NULL;
 354         }
 355         mutex_unlock(&hdr->block_mutex);
 356         return (struct snd_util_memblk *)blk;
 357 }
 358
 359
 360 /*
 361  * release DMA buffer from page table
 362  */
 363 int snd_emu10k1_free_pages(struct snd_emu10k1 *emu, struct snd_util_memblk *blk)
 364 {
 365         if (snd_BUG_ON(!emu || !blk))
 366                 return -EINVAL;
 367         return snd_emu10k1_synth_free(emu, blk);
 368 }
 369
 370 /*
 371  * allocate DMA pages, widening the allocation if necessary
 372  *
 373  * See the comment above snd_emu10k1_detect_iommu() in emu10k1_main.c why
 374  * this might be needed.
 375  *
 376  * If you modify this function check whether __synth_free_pages() also needs
 377  * changes.
 378  */
 379 int snd_emu10k1_alloc_pages_maybe_wider(struct snd_emu10k1 *emu, size_t size,
 380                                         struct snd_dma_buffer *dmab)
 381 {
 382         if (emu->iommu_workaround) {
 383                 size_t npages = DIV_ROUND_UP(size, PAGE_SIZE);
 384                 size_t size_real = npages * PAGE_SIZE;
 385
 386                 /*
 387                  * The device has been observed to accesses up to 256 extra
 388                  * bytes, but use 1k to be safe.
 389                  */
 390                 if (size_real < size + 1024)
 391                         size += PAGE_SIZE;
 392         }
 393
 394         return snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
 395                                    &emu->pci->dev, size, dmab);
 396 }
 397
 398 /*
 399  * memory allocation using multiple pages (for synth)
 400  * Unlike the DMA allocation above, non-contiguous pages are assined.
 401  */
 402
 403 /*
 404  * allocate a synth sample area
 405  */
 406 struct snd_util_memblk *
 407 snd_emu10k1_synth_alloc(struct snd_emu10k1 *hw, unsigned int size)
 408 {
 409         struct snd_emu10k1_memblk *blk;
 410         struct snd_util_memhdr *hdr = hw->memhdr;
 411
 412         mutex_lock(&hdr->block_mutex);
 413         blk = (struct snd_emu10k1_memblk *)__snd_util_mem_alloc(hdr, size);
 414         if (blk == NULL) {
 415                 mutex_unlock(&hdr->block_mutex);
 416                 return NULL;
 417         }
 418         if (synth_alloc_pages(hw, blk)) {
 419                 __snd_util_mem_free(hdr, (struct snd_util_memblk *)blk);
 420                 mutex_unlock(&hdr->block_mutex);
 421                 return NULL;
 422         }
 423         snd_emu10k1_memblk_map(hw, blk);
 424         mutex_unlock(&hdr->block_mutex);
 425         return (struct snd_util_memblk *)blk;
 426 }
 427
 428 EXPORT_SYMBOL(snd_emu10k1_synth_alloc);
 429
 430 /*
 431  * free a synth sample area
 432  */
 433 int
 434 snd_emu10k1_synth_free(struct snd_emu10k1 *emu, struct snd_util_memblk *memblk)
 435 {
 436         struct snd_util_memhdr *hdr = emu->memhdr;
 437         struct snd_emu10k1_memblk *blk = (struct snd_emu10k1_memblk *)memblk;
 438         unsigned long flags;
 439
 440         mutex_lock(&hdr->block_mutex);
 441         spin_lock_irqsave(&emu->memblk_lock, flags);
 442         if (blk->mapped_page >= 0)
 443                 unmap_memblk(emu, blk);
 444         spin_unlock_irqrestore(&emu->memblk_lock, flags);
 445         synth_free_pages(emu, blk);
 446          __snd_util_mem_free(hdr, memblk);
 447         mutex_unlock(&hdr->block_mutex);
 448         return 0;
 449 }
 450
 451 EXPORT_SYMBOL(snd_emu10k1_synth_free);
 452
 453 /* check new allocation range */
 454 static void get_single_page_range(struct snd_util_memhdr *hdr,
 455                                   struct snd_emu10k1_memblk *blk,
 456                                   int *first_page_ret, int *last_page_ret)
 457 {
 458         struct list_head *p;
 459         struct snd_emu10k1_memblk *q;
 460         int first_page, last_page;
 461         first_page = blk->first_page;
 462         p = blk->mem.list.prev;
 463         if (p != &hdr->block) {
 464                 q = get_emu10k1_memblk(p, mem.list);
 465                 if (q->last_page == first_page)
 466                         first_page++;  /* first page was already allocated */
 467         }
 468         last_page = blk->last_page;
 469         p = blk->mem.list.next;
 470         if (p != &hdr->block) {
 471                 q = get_emu10k1_memblk(p, mem.list);
 472                 if (q->first_page == last_page)
 473                         last_page--; /* last page was already allocated */
 474         }
 475         *first_page_ret = first_page;
 476         *last_page_ret = last_page;
 477 }
 478
 479 /* release allocated pages */
 480 static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
 481                                int last_page)
 482 {
 483         struct snd_dma_buffer dmab;
 484         int page;
 485
 486         dmab.dev.type = SNDRV_DMA_TYPE_DEV;
 487         dmab.dev.dev = &emu->pci->dev;
 488
 489         for (page = first_page; page <= last_page; page++) {
 490                 if (emu->page_ptr_table[page] == NULL)
 491                         continue;
 492                 dmab.area = emu->page_ptr_table[page];
 493                 dmab.addr = emu->page_addr_table[page];
 494
 495                 /*
 496                  * please keep me in sync with logic in
 497                  * snd_emu10k1_alloc_pages_maybe_wider()
 498                  */
 499                 dmab.bytes = PAGE_SIZE;
 500                 if (emu->iommu_workaround)
 501                         dmab.bytes *= 2;
 502
 503                 snd_dma_free_pages(&dmab);
 504                 emu->page_addr_table[page] = 0;
 505                 emu->page_ptr_table[page] = NULL;
 506         }
 507 }
 508
 509 /*
 510  * allocate kernel pages
 511  */
 512 static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 513 {
 514         int page, first_page, last_page;
 515         struct snd_dma_buffer dmab;
 516
 517         emu10k1_memblk_init(blk);
 518         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
 519         /* allocate kernel pages */
 520         for (page = first_page; page <= last_page; page++) {
 521                 if (snd_emu10k1_alloc_pages_maybe_wider(emu, PAGE_SIZE,
 522                                                         &dmab) < 0)
 523                         goto __fail;
 524                 if (!is_valid_page(emu, dmab.addr)) {
 525                         snd_dma_free_pages(&dmab);
 526                         goto __fail;
 527                 }
 528                 emu->page_addr_table[page] = dmab.addr;
 529                 emu->page_ptr_table[page] = dmab.area;
 530         }
 531         return 0;
 532
 533 __fail:
 534         /* release allocated pages */
 535         last_page = page - 1;
 536         __synth_free_pages(emu, first_page, last_page);
 537
 538         return -ENOMEM;
 539 }
 540
 541 /*
 542  * free pages
 543  */
 544 static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
 545 {
 546         int first_page, last_page;
 547
 548         get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
 549         __synth_free_pages(emu, first_page, last_page);
 550         return 0;
 551 }
 552
 553 /* calculate buffer pointer from offset address */
 554 static inline void *offset_ptr(struct snd_emu10k1 *emu, int page, int offset)
 555 {
 556         char *ptr;
 557         if (snd_BUG_ON(page < 0 || page >= emu->max_cache_pages))
 558                 return NULL;
 559         ptr = emu->page_ptr_table[page];
 560         if (! ptr) {
 561                 dev_err(emu->card->dev,
 562                         "access to NULL ptr: page = %d\n", page);
 563                 return NULL;
 564         }
 565         ptr += offset & (PAGE_SIZE - 1);
 566         return (void*)ptr;
 567 }
 568
 569 /*
 570  * bzero(blk + offset, size)
 571  */
 572 int snd_emu10k1_synth_bzero(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
 573                             int offset, int size)
 574 {
 575         int page, nextofs, end_offset, temp, temp1;
 576         void *ptr;
 577         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 578
 579         offset += blk->offset & (PAGE_SIZE - 1);
 580         end_offset = offset + size;
 581         page = get_aligned_page(offset);
 582         do {
 583                 nextofs = aligned_page_offset(page + 1);
 584                 temp = nextofs - offset;
 585                 temp1 = end_offset - offset;
 586                 if (temp1 < temp)
 587                         temp = temp1;
 588                 ptr = offset_ptr(emu, page + p->first_page, offset);
 589                 if (ptr)
 590                         memset(ptr, 0, temp);
 591                 offset = nextofs;
 592                 page++;
 593         } while (offset < end_offset);
 594         return 0;
 595 }
 596
 597 EXPORT_SYMBOL(snd_emu10k1_synth_bzero);
 598
 599 /*
 600  * copy_from_user(blk + offset, data, size)
 601  */
 602 int snd_emu10k1_synth_copy_from_user(struct snd_emu10k1 *emu, struct snd_util_memblk *blk,
 603                                      int offset, const char __user *data, int size)
 604 {
 605         int page, nextofs, end_offset, temp, temp1;
 606         void *ptr;
 607         struct snd_emu10k1_memblk *p = (struct snd_emu10k1_memblk *)blk;
 608
 609         offset += blk->offset & (PAGE_SIZE - 1);
 610         end_offset = offset + size;
 611         page = get_aligned_page(offset);
 612         do {
 613                 nextofs = aligned_page_offset(page + 1);
 614                 temp = nextofs - offset;
 615                 temp1 = end_offset - offset;
 616                 if (temp1 < temp)
 617                         temp = temp1;
 618                 ptr = offset_ptr(emu, page + p->first_page, offset);
 619                 if (ptr && copy_from_user(ptr, data, temp))
 620                         return -EFAULT;
 621                 offset = nextofs;
 622                 data += temp;
 623                 page++;
 624         } while (offset < end_offset);
 625         return 0;
 626 }
 627
 628 EXPORT_SYMBOL(snd_emu10k1_synth_copy_from_user);