release/src-rt-6.x.4708/linux/linux-2.6.36/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
  37
  38 MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@perex.cz>");
  39 MODULE_DESCRIPTION("Memory allocator for ALSA system.");
  40 MODULE_LICENSE("GPL");
  41
  42
  43 /*
  44  */
  45
  46 static DEFINE_MUTEX(list_mutex);
  47 static LIST_HEAD(mem_list_head);
  48
  49 /* buffer preservation list */
  50 struct snd_mem_list {
  51         struct snd_dma_buffer buffer;
  52         unsigned int id;
  53         struct list_head list;
  54 };
  55
  56 /* id for pre-allocated buffers */
  57 #define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
  58
  59 /*
  60  *
  61  *  Generic memory allocators
  62  *
  63  */
  64
  65 static long snd_allocated_pages; /* holding the number of allocated pages */
  66
  67 static inline void inc_snd_pages(int order)
  68 {
  69         snd_allocated_pages += 1 << order;
  70 }
  71
  72 static inline void dec_snd_pages(int order)
  73 {
  74         snd_allocated_pages -= 1 << order;
  75 }
  76
  77 /**
  78  * snd_malloc_pages - allocate pages with the given size
  79  * @size: the size to allocate in bytes
  80  * @gfp_flags: the allocation conditions, GFP_XXX
  81  *
  82  * Allocates the physically contiguous pages with the given size.
  83  *
  84  * Returns the pointer of the buffer, or NULL if no enoguh memory.
  85  */
  86 void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
  87 {
  88         int pg;
  89         void *res;
  90
  91         if (WARN_ON(!size))
  92                 return NULL;
  93         if (WARN_ON(!gfp_flags))
  94                 return NULL;
  95         gfp_flags |= __GFP_COMP;        /* compound page lets parts be mapped */
  96         pg = get_order(size);
  97         if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL)
  98                 inc_snd_pages(pg);
  99         return res;
 100 }
 101
 102 /**
 103  * snd_free_pages - release the pages
 104  * @ptr: the buffer pointer to release
 105  * @size: the allocated buffer size
 106  *
 107  * Releases the buffer allocated via snd_malloc_pages().
 108  */
 109 void snd_free_pages(void *ptr, size_t size)
 110 {
 111         int pg;
 112
 113         if (ptr == NULL)
 114                 return;
 115         pg = get_order(size);
 116         dec_snd_pages(pg);
 117         free_pages((unsigned long) ptr, pg);
 118 }
 119
 120 /*
 121  *
 122  *  Bus-specific memory allocators
 123  *
 124  */
 125
 126 #ifdef CONFIG_HAS_DMA
 127 /* allocate the coherent DMA pages */
 128 static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
 129 {
 130         int pg;
 131         void *res;
 132         gfp_t gfp_flags;
 133
 134         if (WARN_ON(!dma))
 135                 return NULL;
 136         pg = get_order(size);
 137         gfp_flags = GFP_KERNEL
 138                 | __GFP_COMP    /* compound page lets parts be mapped */
 139                 | __GFP_NORETRY /* don't trigger OOM-killer */
 140                 | __GFP_NOWARN; /* no stack trace print - this call is non-critical */
 141         res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
 142         if (res != NULL)
 143                 inc_snd_pages(pg);
 144
 145         return res;
 146 }
 147
 148 /* free the coherent DMA pages */
 149 static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
 150                                dma_addr_t dma)
 151 {
 152         int pg;
 153
 154         if (ptr == NULL)
 155                 return;
 156         pg = get_order(size);
 157         dec_snd_pages(pg);
 158         dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
 159 }
 160 #endif /* CONFIG_HAS_DMA */
 161
 162 /*
 163  *
 164  *  ALSA generic memory management
 165  *
 166  */
 167
 168
 169 /**
 170  * snd_dma_alloc_pages - allocate the buffer area according to the given type
 171  * @type: the DMA buffer type
 172  * @device: the device pointer
 173  * @size: the buffer size to allocate
 174  * @dmab: buffer allocation record to store the allocated data
 175  *
 176  * Calls the memory-allocator function for the corresponding
 177  * buffer type.
 178  *
 179  * Returns zero if the buffer with the given size is allocated successfuly,
 180  * other a negative value at error.
 181  */
 182 int snd_dma_alloc_pages(int type, struct device *device, size_t size,
 183                         struct snd_dma_buffer *dmab)
 184 {
 185         if (WARN_ON(!size))
 186                 return -ENXIO;
 187         if (WARN_ON(!dmab))
 188                 return -ENXIO;
 189
 190         dmab->dev.type = type;
 191         dmab->dev.dev = device;
 192         dmab->bytes = 0;
 193         switch (type) {
 194         case SNDRV_DMA_TYPE_CONTINUOUS:
 195                 dmab->area = snd_malloc_pages(size, (unsigned long)device);
 196                 dmab->addr = 0;
 197                 break;
 198 #ifdef CONFIG_HAS_DMA
 199         case SNDRV_DMA_TYPE_DEV:
 200                 dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);
 201                 break;
 202 #endif
 203 #ifdef CONFIG_SND_DMA_SGBUF
 204         case SNDRV_DMA_TYPE_DEV_SG:
 205                 snd_malloc_sgbuf_pages(device, size, dmab, NULL);
 206                 break;
 207 #endif
 208         default:
 209                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", type);
 210                 dmab->area = NULL;
 211                 dmab->addr = 0;
 212                 return -ENXIO;
 213         }
 214         if (! dmab->area)
 215                 return -ENOMEM;
 216         dmab->bytes = size;
 217         return 0;
 218 }
 219
 220 /**
 221  * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
 222  * @type: the DMA buffer type
 223  * @device: the device pointer
 224  * @size: the buffer size to allocate
 225  * @dmab: buffer allocation record to store the allocated data
 226  *
 227  * Calls the memory-allocator function for the corresponding
 228  * buffer type.  When no space is left, this function reduces the size and
 229  * tries to allocate again.  The size actually allocated is stored in
 230  * res_size argument.
 231  *
 232  * Returns zero if the buffer with the given size is allocated successfuly,
 233  * other a negative value at error.
 234  */
 235 int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
 236                                  struct snd_dma_buffer *dmab)
 237 {
 238         int err;
 239
 240         while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
 241                 size_t aligned_size;
 242                 if (err != -ENOMEM)
 243                         return err;
 244                 if (size <= PAGE_SIZE)
 245                         return -ENOMEM;
 246                 aligned_size = PAGE_SIZE << get_order(size);
 247                 if (size != aligned_size)
 248                         size = aligned_size;
 249                 else
 250                         size >>= 1;
 251         }
 252         if (! dmab->area)
 253                 return -ENOMEM;
 254         return 0;
 255 }
 256
 257
 258 /**
 259  * snd_dma_free_pages - release the allocated buffer
 260  * @dmab: the buffer allocation record to release
 261  *
 262  * Releases the allocated buffer via snd_dma_alloc_pages().
 263  */
 264 void snd_dma_free_pages(struct snd_dma_buffer *dmab)
 265 {
 266         switch (dmab->dev.type) {
 267         case SNDRV_DMA_TYPE_CONTINUOUS:
 268                 snd_free_pages(dmab->area, dmab->bytes);
 269                 break;
 270 #ifdef CONFIG_HAS_DMA
 271         case SNDRV_DMA_TYPE_DEV:
 272                 snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
 273                 break;
 274 #endif
 275 #ifdef CONFIG_SND_DMA_SGBUF
 276         case SNDRV_DMA_TYPE_DEV_SG:
 277                 snd_free_sgbuf_pages(dmab);
 278                 break;
 279 #endif
 280         default:
 281                 printk(KERN_ERR "snd-malloc: invalid device type %d\n", dmab->dev.type);
 282         }
 283 }
 284
 285
 286 /**
 287  * snd_dma_get_reserved - get the reserved buffer for the given device
 288  * @dmab: the buffer allocation record to store
 289  * @id: the buffer id
 290  *
 291  * Looks for the reserved-buffer list and re-uses if the same buffer
 292  * is found in the list.  When the buffer is found, it's removed from the free list.
 293  *
 294  * Returns the size of buffer if the buffer is found, or zero if not found.
 295  */
 296 size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id)
 297 {
 298         struct snd_mem_list *mem;
 299
 300         if (WARN_ON(!dmab))
 301                 return 0;
 302
 303         mutex_lock(&list_mutex);
 304         list_for_each_entry(mem, &mem_list_head, list) {
 305                 if (mem->id == id &&
 306                     (mem->buffer.dev.dev == NULL || dmab->dev.dev == NULL ||
 307                      ! memcmp(&mem->buffer.dev, &dmab->dev, sizeof(dmab->dev)))) {
 308                         struct device *dev = dmab->dev.dev;
 309                         list_del(&mem->list);
 310                         *dmab = mem->buffer;
 311                         if (dmab->dev.dev == NULL)
 312                                 dmab->dev.dev = dev;
 313                         kfree(mem);
 314                         mutex_unlock(&list_mutex);
 315                         return dmab->bytes;
 316                 }
 317         }
 318         mutex_unlock(&list_mutex);
 319         return 0;
 320 }
 321
 322 /**
 323  * snd_dma_reserve_buf - reserve the buffer
 324  * @dmab: the buffer to reserve
 325  * @id: the buffer id
 326  *
 327  * Reserves the given buffer as a reserved buffer.
 328  *
 329  * Returns zero if successful, or a negative code at error.
 330  */
 331 int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id)
 332 {
 333         struct snd_mem_list *mem;
 334
 335         if (WARN_ON(!dmab))
 336                 return -EINVAL;
 337         mem = kmalloc(sizeof(*mem), GFP_KERNEL);
 338         if (! mem)
 339                 return -ENOMEM;
 340         mutex_lock(&list_mutex);
 341         mem->buffer = *dmab;
 342         mem->id = id;
 343         list_add_tail(&mem->list, &mem_list_head);
 344         mutex_unlock(&list_mutex);
 345         return 0;
 346 }
 347
 348 /*
 349  * purge all reserved buffers
 350  */
 351 static void free_all_reserved_pages(void)
 352 {
 353         struct list_head *p;
 354         struct snd_mem_list *mem;
 355
 356         mutex_lock(&list_mutex);
 357         while (! list_empty(&mem_list_head)) {
 358                 p = mem_list_head.next;
 359                 mem = list_entry(p, struct snd_mem_list, list);
 360                 list_del(p);
 361                 snd_dma_free_pages(&mem->buffer);
 362                 kfree(mem);
 363         }
 364         mutex_unlock(&list_mutex);
 365 }
 366
 367
 368 #ifdef CONFIG_PROC_FS
 369 /*
 370  * proc file interface
 371  */
 372 #define SND_MEM_PROC_FILE       "driver/snd-page-alloc"
 373 static struct proc_dir_entry *snd_mem_proc;
 374
 375 static int snd_mem_proc_read(struct seq_file *seq, void *offset)
 376 {
 377         long pages = snd_allocated_pages >> (PAGE_SHIFT-12);
 378         struct snd_mem_list *mem;
 379         int devno;
 380         static char *types[] = { "UNKNOWN", "CONT", "DEV", "DEV-SG" };
 381
 382         mutex_lock(&list_mutex);
 383         seq_printf(seq, "pages  : %li bytes (%li pages per %likB)\n",
 384                    pages * PAGE_SIZE, pages, PAGE_SIZE / 1024);
 385         devno = 0;
 386         list_for_each_entry(mem, &mem_list_head, list) {
 387                 devno++;
 388                 seq_printf(seq, "buffer %d : ID %08x : type %s\n",
 389                            devno, mem->id, types[mem->buffer.dev.type]);
 390                 seq_printf(seq, "  addr = 0x%lx, size = %d bytes\n",
 391                            (unsigned long)mem->buffer.addr,
 392                            (int)mem->buffer.bytes);
 393         }
 394         mutex_unlock(&list_mutex);
 395         return 0;
 396 }
 397
 398 static int snd_mem_proc_open(struct inode *inode, struct file *file)
 399 {
 400         return single_open(file, snd_mem_proc_read, NULL);
 401 }
 402
 403 #ifdef CONFIG_PCI
 404 #define gettoken(bufp) strsep(bufp, " \t\n")
 405
 406 static ssize_t snd_mem_proc_write(struct file *file, const char __user * buffer,
 407                                   size_t count, loff_t * ppos)
 408 {
 409         char buf[128];
 410         char *token, *p;
 411
 412         if (count > sizeof(buf) - 1)
 413                 return -EINVAL;
 414         if (copy_from_user(buf, buffer, count))
 415                 return -EFAULT;
 416         buf[count] = '\0';
 417
 418         p = buf;
 419         token = gettoken(&p);
 420         if (! token || *token == '#')
 421                 return count;
 422         if (strcmp(token, "add") == 0) {
 423                 char *endp;
 424                 int vendor, device, size, buffers;
 425                 long mask;
 426                 int i, alloced;
 427                 struct pci_dev *pci;
 428
 429                 if ((token = gettoken(&p)) == NULL ||
 430                     (vendor = simple_strtol(token, NULL, 0)) <= 0 ||
 431                     (token = gettoken(&p)) == NULL ||
 432                     (device = simple_strtol(token, NULL, 0)) <= 0 ||
 433                     (token = gettoken(&p)) == NULL ||
 434                     (mask = simple_strtol(token, NULL, 0)) < 0 ||
 435                     (token = gettoken(&p)) == NULL ||
 436                     (size = memparse(token, &endp)) < 64*1024 ||
 437                     size > 16*1024*1024 /* too big */ ||
 438                     (token = gettoken(&p)) == NULL ||
 439                     (buffers = simple_strtol(token, NULL, 0)) <= 0 ||
 440                     buffers > 4) {
 441                         printk(KERN_ERR "snd-page-alloc: invalid proc write format\n");
 442                         return count;
 443                 }
 444                 vendor &= 0xffff;
 445                 device &= 0xffff;
 446
 447                 alloced = 0;
 448                 pci = NULL;
 449                 while ((pci = pci_get_device(vendor, device, pci)) != NULL) {
 450                         if (mask > 0 && mask < 0xffffffff) {
 451                                 if (pci_set_dma_mask(pci, mask) < 0 ||
 452                                     pci_set_consistent_dma_mask(pci, mask) < 0) {
 453                                         printk(KERN_ERR "snd-page-alloc: cannot set DMA mask %lx for pci %04x:%04x\n", mask, vendor, device);
 454                                         pci_dev_put(pci);
 455                                         return count;
 456                                 }
 457                         }
 458                         for (i = 0; i < buffers; i++) {
 459                                 struct snd_dma_buffer dmab;
 460                                 memset(&dmab, 0, sizeof(dmab));
 461                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(pci),
 462                                                         size, &dmab) < 0) {
 463                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 464                                         pci_dev_put(pci);
 465                                         return count;
 466                                 }
 467                                 snd_dma_reserve_buf(&dmab, snd_dma_pci_buf_id(pci));
 468                         }
 469                         alloced++;
 470                 }
 471                 if (! alloced) {
 472                         for (i = 0; i < buffers; i++) {
 473                                 struct snd_dma_buffer dmab;
 474                                 memset(&dmab, 0, sizeof(dmab));
 475                                 if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, NULL,
 476                                                         size, &dmab) < 0) {
 477                                         printk(KERN_ERR "snd-page-alloc: cannot allocate buffer pages (size = %d)\n", size);
 478                                         break;
 479                                 }
 480                                 snd_dma_reserve_buf(&dmab, (unsigned int)((vendor << 16) | device));
 481                         }
 482                 }
 483         } else if (strcmp(token, "erase") == 0)
 484                 free_all_reserved_pages();
 485         else
 486                 printk(KERN_ERR "snd-page-alloc: invalid proc cmd\n");
 487         return count;
 488 }
 489 #endif /* CONFIG_PCI */
 490
 491 static const struct file_operations snd_mem_proc_fops = {
 492         .owner          = THIS_MODULE,
 493         .open           = snd_mem_proc_open,
 494         .read           = seq_read,
 495 #ifdef CONFIG_PCI
 496         .write          = snd_mem_proc_write,
 497 #endif
 498         .llseek         = seq_lseek,
 499         .release        = single_release,
 500 };
 501
 502 #endif /* CONFIG_PROC_FS */
 503
 504 /*
 505  * module entry
 506  */
 507
 508 static int __init snd_mem_init(void)
 509 {
 510 #ifdef CONFIG_PROC_FS
 511         snd_mem_proc = proc_create(SND_MEM_PROC_FILE, 0644, NULL,
 512                                    &snd_mem_proc_fops);
 513 #endif
 514         return 0;
 515 }
 516
 517 static void __exit snd_mem_exit(void)
 518 {
 519         remove_proc_entry(SND_MEM_PROC_FILE, NULL);
 520         free_all_reserved_pages();
 521         if (snd_allocated_pages > 0)
 522                 printk(KERN_ERR "snd-malloc: Memory leak?  pages not freed = %li\n", snd_allocated_pages);
 523 }
 524
 525
 526 module_init(snd_mem_init)
 527 module_exit(snd_mem_exit)
 528
 529
 530 /*
 531  * exports
 532  */
 533 EXPORT_SYMBOL(snd_dma_alloc_pages);
 534 EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
 535 EXPORT_SYMBOL(snd_dma_free_pages);
 536
 537 EXPORT_SYMBOL(snd_dma_get_reserved_buf);
 538 EXPORT_SYMBOL(snd_dma_reserve_buf);
 539
 540 EXPORT_SYMBOL(snd_malloc_pages);
 541 EXPORT_SYMBOL(snd_free_pages);