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