sound/core/memalloc.c

   1 /*
   2  *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
   3  *                   Takashi Iwai <tiwai@suse.de>
   4  *
   5  *  Generic memory allocators
   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/module.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/init.h>
  27 #include <linux/pci.h>
  28 #include <linux/slab.h>
  29 #include <linux/mm.h>
  30 #include <linux/seq_file.h>
  31 #include <asm/uaccess.h>
  32 #include <linux/dma-mapping.h>
  33 #include <linux/moduleparam.h>
  34 #include <linux/mutex.h>
  35 #include <sound/memalloc.h>
  36 #ifdef CONFIG_SBUS
  37 #include <asm/sbus.h>
  38 #endif
  39
  40
  41 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
  42 MODULE_DESCRIPTION("Memory allocator for ALSA system.");
  43 MODULE_LICENSE("GPL");
  44
  45
  46 /*
  47  */
  48
  49 void *snd_malloc_sgbuf_pages(struct device *device,
  50                              size_t size, struct snd_dma_buffer *dmab,
  51                              size_t *res_size);
  52 int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
  53
  54 /*
  55  */
  56
  57 static DEFINE_MUTEX(list_mutex);
  58 static LIST_HEAD(mem_list_head);
  59
  60 /* buffer preservation list */
  61 struct snd_mem_list {
  62         struct snd_dma_buffer buffer;
  63         unsigned int id;
  64         struct list_head list;
  65 };
  66
  67 /* id for pre-allocated buffers */
  68 #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
  69
  70 #ifdef CONFIG_SND_DEBUG
  71 #define __ASTRING__(x) #x
  72 #define snd_assert(expr, args...) do {\
  73         if (!(expr)) {\
  74                 printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
  75                 args;\
  76         }\
  77 } while (0)
  78 #else
  79 #define snd_assert(expr, args...) /**/
  80 #endif
  81
  82 /*
  83  *
  84  *  Generic memory allocators
  85  *
  86  */
  87
  88 static long snd_allocated_pages; /* holding the number of allocated pages */
  89
  90 static inline void inc_snd_pages(int order)
  91 {
  92         snd_allocated_pages += 1 << order;
  93 }
  94
  95 static inline void dec_snd_pages(int order)
  96 {
  97         snd_allocated_pages -= 1 << order;
  98 }
  99
 100 /**
 101  * snd_malloc_pages - allocate pages with the given size
 102  * @size: the size to allocate in bytes
 103  * @gfp_flags: the allocation conditions, GFP_XXX
 104  *
 105  * Allocates the physically contiguous pages with the given size.
 106  *
 107  * Returns the pointer of the buffer, or NULL if no enoguh memory.
 108  */
 109 void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
 110 {
 111         int pg;
 112         void *res;
 113
 114         snd_assert(size > 0, return NULL);
 115         snd_assert(gfp_flags != 0, return NULL);
 116         gfp_flags |= __GFP_COMP;        /* compound page lets parts be mapped */
 117         pg = get_order(size);
 118         if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
 119                 inc_snd_pages(pg);
 120         return res;
 121 }
 122
 123 /**
 124  * snd_free_pages - release the pages
 125  * @ptr: the buffer pointer to release
 126  * @size: the allocated buffer size
 127  *
 128  * Releases the buffer allocated via snd_malloc_pages().
 129  */
 130 void snd_free_pages(void *ptr, size_t size)
 131 {
 132         int pg;
 133
 134         if (ptr == NULL)
 135                 return;
 136         pg = get_order(size);
 137         dec_snd_pages(pg);
 138         free_pages((unsigned long) ptr, pg);
 139 }
 140
 141 /*
 142  *
 143  *  Bus-specific memory allocators
 144  *
 145  */
 146
 147 #ifdef CONFIG_HAS_DMA
 148 /* allocate the coherent DMA pages */
 149 static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
 150 {
 151         int pg;
 152         void *res;
 153         gfp_t gfp_flags;
 154
 155         snd_assert(size > 0, return NULL);
 156         snd_assert(dma != NULL, return NULL);
 157         pg = get_order(size);
 158         gfp_flags = GFP_KERNEL
 159                 | __GFP_COMP    /* compound page lets parts be mapped */
 160                 | __GFP_NORETRY /* don't trigger OOM-killer */
 161                 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
 162         res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
 163         if (res != NULL)
 164                 inc_snd_pages(pg);
 165
 166         return res;
 167 }
 168
 169 /* free the coherent DMA pages */
 170 static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
 171                                dma_addr_t dma)
 172 {
 173         int pg;
 174
 175         if (ptr == NULL)
 176                 return;
 177         pg = get_order(size);
 178         dec_snd_pages(pg);
 179         dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
 180 }
 181 #endif /* CONFIG_HAS_DMA */
 182
 183 #ifdef CONFIG_SBUS
 184
 185 static void *snd_malloc_sbus_pages(struct device *dev, size_t size,
 186                                    dma_addr_t *dma_addr)
 187 {
 188         struct sbus_dev *sdev = (struct sbus_dev *)dev;
 189         int pg;
 190         void *res;
 191
 192         snd_assert(size > 0, return NULL);
 193         snd_assert(dma_addr != NULL, return NULL);
 194         pg = get_order(size);
 195         res = sbus_alloc_consistent(sdev, PAGE_SIZE * (1 << pg), dma_addr);
 196         if (res != NULL)
 197                 inc_snd_pages(pg);
 198         return res;
 199 }
 200
 201 static void snd_free_sbus_pages(struct device *dev, size_t size,
 202                                 void *ptr, dma_addr_t dma_addr)
 203 {
 204         struct sbus_dev *sdev = (struct sbus_dev *)dev;
 205         int pg;
 206
 207         if (ptr == NULL)
 208                 return;
 209         pg = get_order(size);
 210         dec_snd_pages(pg);
 211         sbus_free_consistent(sdev, PAGE_SIZE * (1 << pg), ptr, dma_addr);
 212 }
 213
 214 #endif /* CONFIG_SBUS */
 215
 216 /*
 217  *
 218  *  ALSA generic memory management
 219  *
 220  */
 221
 222
 223 /**
 224  * snd_dma_alloc_pages - allocate the buffer area according to the given type
 225  * @type: the DMA buffer type
 226  * @device: the device pointer
 227  * @size: the buffer size to allocate
 228  * @dmab: buffer allocation record to store the allocated data
 229  *
 230  * Calls the memory-allocator function for the corresponding
 231  * buffer type.
 232  *
 233  * Returns zero if the buffer with the given size is allocated successfuly,
 234  * other a negative value at error.
 235  */
 236 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
 237                         struct snd_dma_buffer *dmab)
 238 {
 239         snd_assert(size > 0, return -ENXIO);
 240         snd_assert(dmab != NULL, return -ENXIO);
 241
 242         dmab->dev.type = type;
 243         dmab->dev.dev = device;
 244         dmab->bytes = 0;
 245         switch (type) {
 246         case SNDRV_DMA_TYPE_CONTINUOUS:
 247                 dmab->area = snd_malloc_pages(size, (unsigned long)device);
 248                 dmab->addr = 0;
 249                 break;
 250 #ifdef CONFIG_SBUS
 251         case SNDRV_DMA_TYPE_SBUS:
 252                 dmab->area = snd_malloc_sbus_pages(device, size, &dmab->addr);
 253                 break;
 254 #endif
 255 #ifdef CONFIG_HAS_DMA
 256         case SNDRV_DMA_TYPE_DEV:
 257                 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
 258                 break;
 259         case SNDRV_DMA_TYPE_DEV_SG:
 260                 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
 261                 break;
 262 #endif
 263         default:
 264                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
 265                 dmab->area = NULL;
 266                 dmab->addr = 0;
 267                 return -ENXIO;
 268         }
 269         if (! dmab->area)
 270                 return -ENOMEM;
 271         dmab->bytes = size;
 272         return 0;
 273 }
 274
 275 /**
 276  * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
 277  * @type: the DMA buffer type
 278  * @device: the device pointer
 279  * @size: the buffer size to allocate
 280  * @dmab: buffer allocation record to store the allocated data
 281  *
 282  * Calls the memory-allocator function for the corresponding
 283  * buffer type.  When no space is left, this function reduces the size and
 284  * tries to allocate again.  The size actually allocated is stored in
 285  * res_size argument.
 286  *
 287  * Returns zero if the buffer with the given size is allocated successfuly,
 288  * other a negative value at error.
 289  */
 290 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
 291                                  struct snd_dma_buffer *dmab)
 292 {
 293         int err;
 294
 295         snd_assert(size > 0, return -ENXIO);
 296         snd_assert(dmab != NULL, return -ENXIO);
 297
 298         while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
 299                 if (err != -ENOMEM)
 300                         return err;
 301                 size >>= 1;
 302                 if (size <= PAGE_SIZE)
 303                         return -ENOMEM;
 304         }
 305         if (! dmab->area)
 306                 return -ENOMEM;
 307         return 0;
 308 }
 309
 310
 311 /**
 312  * snd_dma_free_pages - release the allocated buffer
 313  * @dmab: the buffer allocation record to release
 314  *
 315  * Releases the allocated buffer via snd_dma_alloc_pages().
 316  */
 317 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
 318 {
 319         switch (dmab->dev.type) {
 320         case SNDRV_DMA_TYPE_CONTINUOUS:
 321                 snd_free_pages(dmab->area, dmab->bytes);
 322                 break;
 323 #ifdef CONFIG_SBUS
 324         case SNDRV_DMA_TYPE_SBUS:
 325                 snd_free_sbus_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
 326                 break;
 327 #endif
 328 #ifdef CONFIG_HAS_DMA
 329         case SNDRV_DMA_TYPE_DEV:
 330                 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
 331                 break;
 332         case SNDRV_DMA_TYPE_DEV_SG:
 333                 snd_free_sgbuf_pages(dmab);
 334                 break;
 335 #endif
 336         default:
 337                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
 338         }
 339 }
 340
 341
 342 /**
 343  * snd_dma_get_reserved - get the reserved buffer for the given device
 344  * @dmab: the buffer allocation record to store
 345  * @id: the buffer id
 346  *
 347  * Looks for the reserved-buffer list and re-uses if the same buffer
 348  * is found in the list.  When the buffer is found, it's removed from the free list.
 349  *
 350  * Returns the size of buffer if the buffer is found, or zero if not found.
 351  */
 352 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
 353 {
 354         struct snd_mem_list *mem;
 355
 356         snd_assert(dmab, return 0);
 357
 358         mutex_lock(&list_mutex);
 359         list_for_each_entry(mem, &mem_list_head, list) {
 360                 if (mem->id == id &&
 361                     (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
 362                      ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
 363                         struct device *dev = dmab->dev.dev;
 364                         list_del(&mem->list);
 365                         *dmab = mem->buffer;
 366                         if (dmab->dev.dev == NULL)
 367                                 dmab->dev.dev = dev;
 368                         kfree(mem);
 369                         mutex_unlock(&list_mutex);
 370                         return dmab->bytes;
 371                 }
 372         }
 373         mutex_unlock(&list_mutex);
 374         return 0;
 375 }
 376
 377 /**
 378  * snd_dma_reserve_buf - reserve the buffer
 379  * @dmab: the buffer to reserve
 380  * @id: the buffer id
 381  *
 382  * Reserves the given buffer as a reserved buffer.
 383  *
 384  * Returns zero if successful, or a negative code at error.
 385  */
 386 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
 387 {
 388         struct snd_mem_list *mem;
 389
 390         snd_assert(dmab, return -EINVAL);
 391         mem = kmalloc(sizeof(*mem), GFP_KERNEL);
 392         if (! mem)
 393                 return -ENOMEM;
 394         mutex_lock(&list_mutex);
 395         mem->buffer = *dmab;
 396         mem->id = id;
 397         list_add_tail(&mem->list, &mem_list_head);
 398         mutex_unlock(&list_mutex);
 399         return 0;
 400 }
 401
 402 /*
 403  * purge all reserved buffers
 404  */
 405 static void free_all_reserved_pages(void)
 406 {
 407         struct list_head *p;
 408         struct snd_mem_list *mem;
 409
 410         mutex_lock(&list_mutex);
 411         while (! list_empty(&mem_list_head)) {
 412                 p = mem_list_head.next;
 413                 mem = list_entry(p, struct snd_mem_list, list);
 414                 list_del(p);
 415                 snd_dma_free_pages(&mem->buffer);
 416                 kfree(mem);
 417         }
 418         mutex_unlock(&list_mutex);
 419 }
 420
 421
 422 #ifdef CONFIG_PROC_FS
 423 /*
 424  * proc file interface
 425  */
 426 #define SND_MEM_PROC_FILE       "driver/snd-page-alloc"
 427 static struct proc_dir_entry *snd_mem_proc;
 428
 429 static int snd_mem_proc_read(struct seq_file *seq, void *offset)
 430 {
 431         long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
 432         struct snd_mem_list *mem;
 433         int devno;
 434         static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG", "SBUS" };
 435
 436         mutex_lock(&list_mutex);
 437         seq_printf(seq, "pages  : %li bytes (%li pages per %likB)\n",
 438                    pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
 439         devno = 0;
 440         list_for_each_entry(mem, &mem_list_head, list) {
 441                 devno++;
 442                 seq_printf(seq, "buffer %d : ID %08x : type %s\n",
 443                            devno, mem->id, types[mem->buffer.dev.type]);
 444                 seq_printf(seq, "  addr = 0x%lx, size = %d bytes\n",
 445                            (unsigned long)mem->buffer.addr,
 446                            (int)mem->buffer.bytes);
 447         }
 448         mutex_unlock(&list_mutex);
 449         return 0;
 450 }
 451
 452 static int snd_mem_proc_open(struct inode *inode, struct file *file)
 453 {
 454         return single_open(file, snd_mem_proc_read, NULL);
 455 }
 456
 457 /* FIXME: for pci only - other bus? */
 458 #ifdef CONFIG_PCI
 459 #define gettoken(bufp) strsep(bufp, " \t\n")
 460
 461 static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
 462                                   size_t count, loff_t * ppos)
 463 {
 464         char buf[128];
 465         char *token, *p;
 466
 467         if (count > sizeof(buf) - 1)
 468                 return -EINVAL;
 469         if (copy_from_user(buf, buffer, count))
 470                 return -EFAULT;
 471         buf[count] = '\0';
 472
 473         p = buf;
 474         token = gettoken(&p);
 475         if (! token || *token == '#')
 476                 return count;
 477         if (strcmp(token, "add") == 0) {
 478                 char *endp;
 479                 int vendor, device, size, buffers;
 480                 long mask;
 481                 int i, alloced;
 482                 struct pci_dev *pci;
 483
 484                 if ((token = gettoken(&p)) == NULL ||
 485                     (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
 486                     (token = gettoken(&p)) == NULL ||
 487                     (device = simple_strtol(token, NULL, 0)) <= 0 ||
 488                     (token = gettoken(&p)) == NULL ||
 489                     (mask = simple_strtol(token, NULL, 0)) < 0 ||
 490                     (token = gettoken(&p)) == NULL ||
 491                     (size = memparse(token, &endp)) < 64*1024 ||
 492                     size > 16*1024*1024 /* too big */ ||
 493                     (token = gettoken(&p)) == NULL ||
 494                     (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
 495                     buffers > 4) {
 496                         printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
 497                         return count;
 498                 }
 499                 vendor &= 0xffff;
 500                 device &= 0xffff;
 501
 502                 alloced = 0;
 503                 pci = NULL;
 504                 while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
 505                         if (mask > 0 && mask < 0xffffffff) {
 506                                 if (pci_set_dma_mask(pci, mask) < 0 ||
 507                                     pci_set_consistent_dma_mask(pci, mask) < 0) {
 508                                         printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
 509                                         pci_dev_put(pci);
 510                                         return count;
 511                                 }
 512                         }
 513                         for (i = 0; i < buffers; i++) {
 514                                 struct snd_dma_buffer dmab;
 515                                 memset(&dmab, 0, sizeof(dmab));
 516                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
 517                                                         size, &dmab) < 0) {
 518                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 519                                         pci_dev_put(pci);
 520                                         return count;
 521                                 }
 522                                 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
 523                         }
 524                         alloced++;
 525                 }
 526                 if (! alloced) {
 527                         for (i = 0; i < buffers; i++) {
 528                                 struct snd_dma_buffer dmab;
 529                                 memset(&dmab, 0, sizeof(dmab));
 530                                 /* FIXME: We can allocate only in ZONE_DMA
 531                                  * without a device pointer!
 532                                  */
 533                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
 534                                                         size, &dmab) < 0) {
 535                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 536                                         break;
 537                                 }
 538                                 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
 539                         }
 540                 }
 541         } else if (strcmp(token, "erase") == 0)
 542                 /* FIXME: need for releasing each buffer chunk? */
 543                 free_all_reserved_pages();
 544         else
 545                 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
 546         return count;
 547 }
 548 #endif /* CONFIG_PCI */
 549
 550 static const struct file_operations snd_mem_proc_fops = {
 551         .owner          = THIS_MODULE,
 552         .open           = snd_mem_proc_open,
 553         .read           = seq_read,
 554 #ifdef CONFIG_PCI
 555         .write          = snd_mem_proc_write,
 556 #endif
 557         .llseek         = seq_lseek,
 558         .release        = single_release,
 559 };
 560
 561 #endif /* CONFIG_PROC_FS */
 562
 563 /*
 564  * module entry
 565  */
 566
 567 static int __init snd_mem_init(void)
 568 {
 569 #ifdef CONFIG_PROC_FS
 570         snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
 571                                    &snd_mem_proc_fops);
 572 #endif
 573         return 0;
 574 }
 575
 576 static void __exit snd_mem_exit(void)
 577 {
 578         remove_proc_entry(SND_MEM_PROC_FILE, NULL);
 579         free_all_reserved_pages();
 580         if (snd_allocated_pages > 0)
 581                 printk(KERN_ERR "snd-malloc: Memory leak?  pages not freed = %li\n", snd_allocated_pages);
 582 }
 583
 584
 585 module_init(snd_mem_init)
 586 module_exit(snd_mem_exit)
 587
 588
 589 /*
 590  * exports
 591  */
 592 EXPORT_SYMBOL(snd_dma_alloc_pages);
 593 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
 594 EXPORT_SYMBOL(snd_dma_free_pages);
 595
 596 EXPORT_SYMBOL(snd_dma_get_reserved_buf);
 597 EXPORT_SYMBOL(snd_dma_reserve_buf);
 598
 599 EXPORT_SYMBOL(snd_malloc_pages);
 600 EXPORT_SYMBOL(snd_free_pages);