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/genalloc.h>
  34 #include <linux/moduleparam.h>
  35 #include <linux/mutex.h>
  36 #include <sound/memalloc.h>
  37
  38
  39 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
  40 MODULE_DESCRIPTION("Memory allocator for ALSA system.");
  41 MODULE_LICENSE("GPL");
  42
  43
  44 /*
  45  */
  46
  47 static DEFINE_MUTEX(list_mutex);
  48 static LIST_HEAD(mem_list_head);
  49
  50 /* buffer preservation list */
  51 struct snd_mem_list {
  52         struct snd_dma_buffer buffer;
  53         unsigned int id;
  54         struct list_head list;
  55 };
  56
  57 /* id for pre-allocated buffers */
  58 #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
  59
  60 /*
  61  *
  62  *  Generic memory allocators
  63  *
  64  */
  65
  66 static long snd_allocated_pages; /* holding the number of allocated pages */
  67
  68 static inline void inc_snd_pages(int order)
  69 {
  70         snd_allocated_pages += 1 << order;
  71 }
  72
  73 static inline void dec_snd_pages(int order)
  74 {
  75         snd_allocated_pages -= 1 << order;
  76 }
  77
  78 /**
  79  * snd_malloc_pages - allocate pages with the given size
  80  * @size: the size to allocate in bytes
  81  * @gfp_flags: the allocation conditions, GFP_XXX
  82  *
  83  * Allocates the physically contiguous pages with the given size.
  84  *
  85  * Return: The pointer of the buffer, or %NULL if no enough memory.
  86  */
  87 void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
  88 {
  89         int pg;
  90         void *res;
  91
  92         if (WARN_ON(!size))
  93                 return NULL;
  94         if (WARN_ON(!gfp_flags))
  95                 return NULL;
  96         gfp_flags |= __GFP_COMP;        /* compound page lets parts be mapped */
  97         pg = get_order(size);
  98         if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
  99                 inc_snd_pages(pg);
 100         return res;
 101 }
 102
 103 /**
 104  * snd_free_pages - release the pages
 105  * @ptr: the buffer pointer to release
 106  * @size: the allocated buffer size
 107  *
 108  * Releases the buffer allocated via snd_malloc_pages().
 109  */
 110 void snd_free_pages(void *ptr, size_t size)
 111 {
 112         int pg;
 113
 114         if (ptr == NULL)
 115                 return;
 116         pg = get_order(size);
 117         dec_snd_pages(pg);
 118         free_pages((unsigned long) ptr, pg);
 119 }
 120
 121 /*
 122  *
 123  *  Bus-specific memory allocators
 124  *
 125  */
 126
 127 #ifdef CONFIG_HAS_DMA
 128 /* allocate the coherent DMA pages */
 129 static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
 130 {
 131         int pg;
 132         void *res;
 133         gfp_t gfp_flags;
 134
 135         if (WARN_ON(!dma))
 136                 return NULL;
 137         pg = get_order(size);
 138         gfp_flags = GFP_KERNEL
 139                 | __GFP_COMP    /* compound page lets parts be mapped */
 140                 | __GFP_NORETRY /* don't trigger OOM-killer */
 141                 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
 142         res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
 143         if (res != NULL)
 144                 inc_snd_pages(pg);
 145
 146         return res;
 147 }
 148
 149 /* free the coherent DMA pages */
 150 static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
 151                                dma_addr_t dma)
 152 {
 153         int pg;
 154
 155         if (ptr == NULL)
 156                 return;
 157         pg = get_order(size);
 158         dec_snd_pages(pg);
 159         dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
 160 }
 161
 162 #ifdef CONFIG_GENERIC_ALLOCATOR
 163 /**
 164  * snd_malloc_dev_iram - allocate memory from on-chip internal ram
 165  * @dmab: buffer allocation record to store the allocated data
 166  * @size: number of bytes to allocate from the iram
 167  *
 168  * This function requires iram phandle provided via of_node
 169  */
 170 static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size)
 171 {
 172         struct device *dev = dmab->dev.dev;
 173         struct gen_pool *pool = NULL;
 174
 175         dmab->area = NULL;
 176         dmab->addr = 0;
 177
 178         if (dev->of_node)
 179                 pool = of_get_named_gen_pool(dev->of_node, "iram", 0);
 180
 181         if (!pool)
 182                 return;
 183
 184         /* Assign the pool into private_data field */
 185         dmab->private_data = pool;
 186
 187         dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
 188 }
 189
 190 /**
 191  * snd_free_dev_iram - free allocated specific memory from on-chip internal ram
 192  * @dmab: buffer allocation record to store the allocated data
 193  */
 194 static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
 195 {
 196         struct gen_pool *pool = dmab->private_data;
 197
 198         if (pool && dmab->area)
 199                 gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
 200 }
 201 #endif /* CONFIG_GENERIC_ALLOCATOR */
 202 #endif /* CONFIG_HAS_DMA */
 203
 204 /*
 205  *
 206  *  ALSA generic memory management
 207  *
 208  */
 209
 210
 211 /**
 212  * snd_dma_alloc_pages - allocate the buffer area according to the given type
 213  * @type: the DMA buffer type
 214  * @device: the device pointer
 215  * @size: the buffer size to allocate
 216  * @dmab: buffer allocation record to store the allocated data
 217  *
 218  * Calls the memory-allocator function for the corresponding
 219  * buffer type.
 220  *
 221  * Return: Zero if the buffer with the given size is allocated successfully,
 222  * otherwise a negative value on error.
 223  */
 224 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
 225                         struct snd_dma_buffer *dmab)
 226 {
 227         if (WARN_ON(!size))
 228                 return -ENXIO;
 229         if (WARN_ON(!dmab))
 230                 return -ENXIO;
 231
 232         dmab->dev.type = type;
 233         dmab->dev.dev = device;
 234         dmab->bytes = 0;
 235         switch (type) {
 236         case SNDRV_DMA_TYPE_CONTINUOUS:
 237                 dmab->area = snd_malloc_pages(size,
 238                                         (__force gfp_t)(unsigned long)device);
 239                 dmab->addr = 0;
 240                 break;
 241 #ifdef CONFIG_HAS_DMA
 242 #ifdef CONFIG_GENERIC_ALLOCATOR
 243         case SNDRV_DMA_TYPE_DEV_IRAM:
 244                 snd_malloc_dev_iram(dmab, size);
 245                 if (dmab->area)
 246                         break;
 247                 /* Internal memory might have limited size and no enough space,
 248                  * so if we fail to malloc, try to fetch memory traditionally.
 249                  */
 250                 dmab->dev.type = SNDRV_DMA_TYPE_DEV;
 251 #endif /* CONFIG_GENERIC_ALLOCATOR */
 252         case SNDRV_DMA_TYPE_DEV:
 253                 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
 254                 break;
 255 #endif
 256 #ifdef CONFIG_SND_DMA_SGBUF
 257         case SNDRV_DMA_TYPE_DEV_SG:
 258                 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
 259                 break;
 260 #endif
 261         default:
 262                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
 263                 dmab->area = NULL;
 264                 dmab->addr = 0;
 265                 return -ENXIO;
 266         }
 267         if (! dmab->area)
 268                 return -ENOMEM;
 269         dmab->bytes = size;
 270         return 0;
 271 }
 272
 273 /**
 274  * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
 275  * @type: the DMA buffer type
 276  * @device: the device pointer
 277  * @size: the buffer size to allocate
 278  * @dmab: buffer allocation record to store the allocated data
 279  *
 280  * Calls the memory-allocator function for the corresponding
 281  * buffer type.  When no space is left, this function reduces the size and
 282  * tries to allocate again.  The size actually allocated is stored in
 283  * res_size argument.
 284  *
 285  * Return: Zero if the buffer with the given size is allocated successfully,
 286  * otherwise a negative value on error.
 287  */
 288 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
 289                                  struct snd_dma_buffer *dmab)
 290 {
 291         int err;
 292
 293         while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
 294                 size_t aligned_size;
 295                 if (err != -ENOMEM)
 296                         return err;
 297                 if (size <= PAGE_SIZE)
 298                         return -ENOMEM;
 299                 aligned_size = PAGE_SIZE << get_order(size);
 300                 if (size != aligned_size)
 301                         size = aligned_size;
 302                 else
 303                         size >>= 1;
 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_HAS_DMA
 324 #ifdef CONFIG_GENERIC_ALLOCATOR
 325         case SNDRV_DMA_TYPE_DEV_IRAM:
 326                 snd_free_dev_iram(dmab);
 327                 break;
 328 #endif /* CONFIG_GENERIC_ALLOCATOR */
 329         case SNDRV_DMA_TYPE_DEV:
 330                 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
 331                 break;
 332 #endif
 333 #ifdef CONFIG_SND_DMA_SGBUF
 334         case SNDRV_DMA_TYPE_DEV_SG:
 335                 snd_free_sgbuf_pages(dmab);
 336                 break;
 337 #endif
 338         default:
 339                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
 340         }
 341 }
 342
 343
 344 /**
 345  * snd_dma_get_reserved - get the reserved buffer for the given device
 346  * @dmab: the buffer allocation record to store
 347  * @id: the buffer id
 348  *
 349  * Looks for the reserved-buffer list and re-uses if the same buffer
 350  * is found in the list.  When the buffer is found, it's removed from the free list.
 351  *
 352  * Return: The size of buffer if the buffer is found, or zero if not found.
 353  */
 354 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
 355 {
 356         struct snd_mem_list *mem;
 357
 358         if (WARN_ON(!dmab))
 359                 return 0;
 360
 361         mutex_lock(&list_mutex);
 362         list_for_each_entry(mem, &mem_list_head, list) {
 363                 if (mem->id == id &&
 364                     (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
 365                      ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
 366                         struct device *dev = dmab->dev.dev;
 367                         list_del(&mem->list);
 368                         *dmab = mem->buffer;
 369                         if (dmab->dev.dev == NULL)
 370                                 dmab->dev.dev = dev;
 371                         kfree(mem);
 372                         mutex_unlock(&list_mutex);
 373                         return dmab->bytes;
 374                 }
 375         }
 376         mutex_unlock(&list_mutex);
 377         return 0;
 378 }
 379
 380 /**
 381  * snd_dma_reserve_buf - reserve the buffer
 382  * @dmab: the buffer to reserve
 383  * @id: the buffer id
 384  *
 385  * Reserves the given buffer as a reserved buffer.
 386  *
 387  * Return: Zero if successful, or a negative code on error.
 388  */
 389 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
 390 {
 391         struct snd_mem_list *mem;
 392
 393         if (WARN_ON(!dmab))
 394                 return -EINVAL;
 395         mem = kmalloc(sizeof(*mem), GFP_KERNEL);
 396         if (! mem)
 397                 return -ENOMEM;
 398         mutex_lock(&list_mutex);
 399         mem->buffer = *dmab;
 400         mem->id = id;
 401         list_add_tail(&mem->list, &mem_list_head);
 402         mutex_unlock(&list_mutex);
 403         return 0;
 404 }
 405
 406 /*
 407  * purge all reserved buffers
 408  */
 409 static void free_all_reserved_pages(void)
 410 {
 411         struct list_head *p;
 412         struct snd_mem_list *mem;
 413
 414         mutex_lock(&list_mutex);
 415         while (! list_empty(&mem_list_head)) {
 416                 p = mem_list_head.next;
 417                 mem = list_entry(p, struct snd_mem_list, list);
 418                 list_del(p);
 419                 snd_dma_free_pages(&mem->buffer);
 420                 kfree(mem);
 421         }
 422         mutex_unlock(&list_mutex);
 423 }
 424
 425
 426 #ifdef CONFIG_PROC_FS
 427 /*
 428  * proc file interface
 429  */
 430 #define SND_MEM_PROC_FILE       "driver/snd-page-alloc"
 431 static struct proc_dir_entry *snd_mem_proc;
 432
 433 static int snd_mem_proc_read(struct seq_file *seq, void *offset)
 434 {
 435         long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
 436         struct snd_mem_list *mem;
 437         int devno;
 438         static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
 439
 440         mutex_lock(&list_mutex);
 441         seq_printf(seq, "pages  : %li bytes (%li pages per %likB)\n",
 442                    pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
 443         devno = 0;
 444         list_for_each_entry(mem, &mem_list_head, list) {
 445                 devno++;
 446                 seq_printf(seq, "buffer %d : ID %08x : type %s\n",
 447                            devno, mem->id, types[mem->buffer.dev.type]);
 448                 seq_printf(seq, "  addr = 0x%lx, size = %d bytes\n",
 449                            (unsigned long)mem->buffer.addr,
 450                            (int)mem->buffer.bytes);
 451         }
 452         mutex_unlock(&list_mutex);
 453         return 0;
 454 }
 455
 456 static int snd_mem_proc_open(struct inode *inode, struct file *file)
 457 {
 458         return single_open(file, snd_mem_proc_read, NULL);
 459 }
 460
 461 /* FIXME: for pci only - other bus? */
 462 #ifdef CONFIG_PCI
 463 #define gettoken(bufp) strsep(bufp, " \t\n")
 464
 465 static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
 466                                   size_t count, loff_t * ppos)
 467 {
 468         char buf[128];
 469         char *token, *p;
 470
 471         if (count > sizeof(buf) - 1)
 472                 return -EINVAL;
 473         if (copy_from_user(buf, buffer, count))
 474                 return -EFAULT;
 475         buf[count] = '\0';
 476
 477         p = buf;
 478         token = gettoken(&p);
 479         if (! token || *token == '#')
 480                 return count;
 481         if (strcmp(token, "add") == 0) {
 482                 char *endp;
 483                 int vendor, device, size, buffers;
 484                 long mask;
 485                 int i, alloced;
 486                 struct pci_dev *pci;
 487
 488                 if ((token = gettoken(&p)) == NULL ||
 489                     (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
 490                     (token = gettoken(&p)) == NULL ||
 491                     (device = simple_strtol(token, NULL, 0)) <= 0 ||
 492                     (token = gettoken(&p)) == NULL ||
 493                     (mask = simple_strtol(token, NULL, 0)) < 0 ||
 494                     (token = gettoken(&p)) == NULL ||
 495                     (size = memparse(token, &endp)) < 64*1024 ||
 496                     size > 16*1024*1024 /* too big */ ||
 497                     (token = gettoken(&p)) == NULL ||
 498                     (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
 499                     buffers > 4) {
 500                         printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
 501                         return count;
 502                 }
 503                 vendor &= 0xffff;
 504                 device &= 0xffff;
 505
 506                 alloced = 0;
 507                 pci = NULL;
 508                 while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
 509                         if (mask > 0 && mask < 0xffffffff) {
 510                                 if (pci_set_dma_mask(pci, mask) < 0 ||
 511                                     pci_set_consistent_dma_mask(pci, mask) < 0) {
 512                                         printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
 513                                         pci_dev_put(pci);
 514                                         return count;
 515                                 }
 516                         }
 517                         for (i = 0; i < buffers; i++) {
 518                                 struct snd_dma_buffer dmab;
 519                                 memset(&dmab, 0, sizeof(dmab));
 520                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
 521                                                         size, &dmab) < 0) {
 522                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 523                                         pci_dev_put(pci);
 524                                         return count;
 525                                 }
 526                                 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
 527                         }
 528                         alloced++;
 529                 }
 530                 if (! alloced) {
 531                         for (i = 0; i < buffers; i++) {
 532                                 struct snd_dma_buffer dmab;
 533                                 memset(&dmab, 0, sizeof(dmab));
 534                                 /* FIXME: We can allocate only in ZONE_DMA
 535                                  * without a device pointer!
 536                                  */
 537                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
 538                                                         size, &dmab) < 0) {
 539                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 540                                         break;
 541                                 }
 542                                 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
 543                         }
 544                 }
 545         } else if (strcmp(token, "erase") == 0)
 546                 /* FIXME: need for releasing each buffer chunk? */
 547                 free_all_reserved_pages();
 548         else
 549                 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
 550         return count;
 551 }
 552 #endif /* CONFIG_PCI */
 553
 554 static const struct file_operations snd_mem_proc_fops = {
 555         .owner          = THIS_MODULE,
 556         .open           = snd_mem_proc_open,
 557         .read           = seq_read,
 558 #ifdef CONFIG_PCI
 559         .write          = snd_mem_proc_write,
 560 #endif
 561         .llseek         = seq_lseek,
 562         .release        = single_release,
 563 };
 564
 565 #endif /* CONFIG_PROC_FS */
 566
 567 /*
 568  * module entry
 569  */
 570
 571 static int __init snd_mem_init(void)
 572 {
 573 #ifdef CONFIG_PROC_FS
 574         snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
 575                                    &snd_mem_proc_fops);
 576 #endif
 577         return 0;
 578 }
 579
 580 static void __exit snd_mem_exit(void)
 581 {
 582         remove_proc_entry(SND_MEM_PROC_FILE, NULL);
 583         free_all_reserved_pages();
 584         if (snd_allocated_pages > 0)
 585                 printk(KERN_ERR "snd-malloc: Memory leak?  pages not freed = %li\n", snd_allocated_pages);
 586 }
 587
 588
 589 module_init(snd_mem_init)
 590 module_exit(snd_mem_exit)
 591
 592
 593 /*
 594  * exports
 595  */
 596 EXPORT_SYMBOL(snd_dma_alloc_pages);
 597 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
 598 EXPORT_SYMBOL(snd_dma_free_pages);
 599
 600 EXPORT_SYMBOL(snd_dma_get_reserved_buf);
 601 EXPORT_SYMBOL(snd_dma_reserve_buf);
 602
 603 EXPORT_SYMBOL(snd_malloc_pages);
 604 EXPORT_SYMBOL(snd_free_pages);