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|
/*
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
* Takashi Iwai <tiwai@suse.de>
*
* Generic memory allocators
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <linux/dma-mapping.h>
#include <linux/moduleparam.h>
#include <asm/semaphore.h>
#include <sound/memalloc.h>
#ifdef CONFIG_SBUS
#include <asm/sbus.h>
#endif
MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>, Jaroslav Kysela <perex@suse.cz>");
MODULE_DESCRIPTION("Memory allocator for ALSA system.");
MODULE_LICENSE("GPL");
#ifndef SNDRV_CARDS
#define SNDRV_CARDS 8
#endif
/*
*/
void *snd_malloc_sgbuf_pages(struct device *device,
size_t size, struct snd_dma_buffer *dmab,
size_t *res_size);
int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
/*
*/
static DECLARE_MUTEX(list_mutex);
static LIST_HEAD(mem_list_head);
/* buffer preservation list */
struct snd_mem_list {
struct snd_dma_buffer buffer;
unsigned int id;
struct list_head list;
};
/* id for pre-allocated buffers */
#define SNDRV_DMA_DEVICE_UNUSED (unsigned int)-1
#ifdef CONFIG_SND_DEBUG
#define __ASTRING__(x) #x
#define snd_assert(expr, args...) do {\
if (!(expr)) {\
printk(KERN_ERR "snd-malloc: BUG? (%s) (called from %p)\n", __ASTRING__(expr), __builtin_return_address(0));\
args;\
}\
} while (0)
#else
#define snd_assert(expr, args...) /**/
#endif
/*
* Hacks
*/
#if defined(__i386__) || defined(__ppc__) || defined(__x86_64__)
/*
* A hack to allocate large buffers via dma_alloc_coherent()
*
* since dma_alloc_coherent always tries GFP_DMA when the requested
* pci memory region is below 32bit, it happens quite often that even
* 2 order of pages cannot be allocated.
*
* so in the following, we allocate at first without dma_mask, so that
* allocation will be done without GFP_DMA. if the area doesn't match
* with the requested region, then realloate with the original dma_mask
* again.
*
* Really, we want to move this type of thing into dma_alloc_coherent()
* so dma_mask doesn't have to be messed with.
*/
static void *snd_dma_hack_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle,
gfp_t flags)
{
void *ret;
u64 dma_mask, coherent_dma_mask;
if (dev == NULL || !dev->dma_mask)
return dma_alloc_coherent(dev, size, dma_handle, flags);
dma_mask = *dev->dma_mask;
coherent_dma_mask = dev->coherent_dma_mask;
*dev->dma_mask = 0xffffffff; /* do without masking */
dev->coherent_dma_mask = 0xffffffff; /* do without masking */
ret = dma_alloc_coherent(dev, size, dma_handle, flags);
*dev->dma_mask = dma_mask; /* restore */
dev->coherent_dma_mask = coherent_dma_mask; /* restore */
if (ret) {
/* obtained address is out of range? */
if (((unsigned long)*dma_handle + size - 1) & ~dma_mask) {
/* reallocate with the proper mask */
dma_free_coherent(dev, size, ret, *dma_handle);
ret = dma_alloc_coherent(dev, size, dma_handle, flags);
}
} else {
/* wish to success now with the proper mask... */
if (dma_mask != 0xffffffffUL) {
/* allocation with GFP_ATOMIC to avoid the long stall */
flags &= ~GFP_KERNEL;
flags |= GFP_ATOMIC;
ret = dma_alloc_coherent(dev, size, dma_handle, flags);
}
}
return ret;
}
/* redefine dma_alloc_coherent for some architectures */
#undef dma_alloc_coherent
#define dma_alloc_coherent snd_dma_hack_alloc_coherent
#endif /* arch */
#if ! defined(__arm__)
#define NEED_RESERVE_PAGES
#endif
/*
*
* Generic memory allocators
*
*/
static long snd_allocated_pages; /* holding the number of allocated pages */
static inline void inc_snd_pages(int order)
{
snd_allocated_pages += 1 << order;
}
static inline void dec_snd_pages(int order)
{
snd_allocated_pages -= 1 << order;
}
static void mark_pages(struct page *page, int order)
{
struct page *last_page = page + (1 << order);
while (page < last_page)
SetPageReserved(page++);
}
static void unmark_pages(struct page *page, int order)
{
struct page *last_page = page + (1 << order);
while (page < last_page)
ClearPageReserved(page++);
}
/**
* snd_malloc_pages - allocate pages with the given size
* @size: the size to allocate in bytes
* @gfp_flags: the allocation conditions, GFP_XXX
*
* Allocates the physically contiguous pages with the given size.
*
* Returns the pointer of the buffer, or NULL if no enoguh memory.
*/
void *snd_malloc_pages(size_t size, gfp_t gfp_flags)
{
int pg;
void *res;
snd_assert(size > 0, return NULL);
snd_assert(gfp_flags != 0, return NULL);
pg = get_order(size);
if ((res = (void *) __get_free_pages(gfp_flags, pg)) != NULL) {
mark_pages(virt_to_page(res), pg);
inc_snd_pages(pg);
}
return res;
}
/**
* snd_free_pages - release the pages
* @ptr: the buffer pointer to release
* @size: the allocated buffer size
*
* Releases the buffer allocated via snd_malloc_pages().
*/
void snd_free_pages(void *ptr, size_t size)
{
int pg;
if (ptr == NULL)
return;
pg = get_order(size);
dec_snd_pages(pg);
unmark_pages(virt_to_page(ptr), pg);
free_pages((unsigned long) ptr, pg);
}
/*
*
* Bus-specific memory allocators
*
*/
/* allocate the coherent DMA pages */
static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma)
{
int pg;
void *res;
gfp_t gfp_flags;
snd_assert(size > 0, return NULL);
snd_assert(dma != NULL, return NULL);
pg = get_order(size);
gfp_flags = GFP_KERNEL
| __GFP_NORETRY /* don't trigger OOM-killer */
| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
res = dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);
if (res != NULL) {
#ifdef NEED_RESERVE_PAGES
mark_pages(virt_to_page(res), pg); /* should be dma_to_page() */
#endif
inc_snd_pages(pg);
}
return res;
}
/* free the coherent DMA pages */
static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,
dma_addr_t dma)
{
int pg;
if (ptr == NULL)
return;
pg = get_order(size);
dec_snd_pages(pg);
#ifdef NEED_RESERVE_PAGES
unmark_pages(virt_to_page(ptr), pg); /* should be dma_to_page() */
#endif
dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);
}
#ifdef CONFIG_SBUS
static void
|