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[ALSA] emu10k1 - simplify page allocation for synth 

Simplify the page allocation of emu10k1 driver for emux synth support.
Since these pages aren't be necessarily coherent, we can avoid
expensive DMA-coherent routines.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2008-05-30 09:49:41 +02:00
parent 2621f0338c
commit a5003fc041
1 changed files with 28 additions and 38 deletions
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66
sound/pci/emu10k1/memory.c
View File

@ -437,43 +437,46 @@ static void get_single_page_range(struct snd_util_memhdr *hdr,
*last_page_ret = last_page;
}
/* release allocated pages */
static void __synth_free_pages(struct snd_emu10k1 *emu, int first_page,
int last_page)
{
int page;
for (page = first_page; page <= last_page; page++) {
free_page((unsigned long)emu->page_ptr_table[page]);
emu->page_addr_table[page] = 0;
emu->page_ptr_table[page] = NULL;
}
}
/*
* allocate kernel pages
*/
static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
int page, first_page, last_page;
struct snd_dma_buffer dmab;
emu10k1_memblk_init(blk);
get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
/* allocate kernel pages */
for (page = first_page; page <= last_page; page++) {
if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(emu->pci),
PAGE_SIZE, &dmab) < 0)
goto __fail;
if (! is_valid_page(emu, dmab.addr)) {
snd_dma_free_pages(&dmab);
goto __fail;
/* first try to allocate from <4GB zone */
struct page *p = alloc_page(GFP_KERNEL | GFP_DMA32 |
__GFP_NOWARN);
if (!p || (page_to_pfn(p) & ~(emu->dma_mask >> PAGE_SHIFT)))
/* try to allocate from <16MB zone */
p = alloc_page(GFP_DMA |
__GFP_NORETRY | /* no OOM-killer */
__GFP_NOWARN);
if (!p) {
__synth_free_pages(emu, first_page, page - 1);
return -ENOMEM;
}
emu->page_addr_table[page] = dmab.addr;
emu->page_ptr_table[page] = dmab.area;
emu->page_addr_table[page] = page_to_phys(p);
emu->page_ptr_table[page] = page_address(p);
}
return 0;
__fail:
/* release allocated pages */
last_page = page - 1;
for (page = first_page; page <= last_page; page++) {
dmab.area = emu->page_ptr_table[page];
dmab.addr = emu->page_addr_table[page];
dmab.bytes = PAGE_SIZE;
snd_dma_free_pages(&dmab);
emu->page_addr_table[page] = 0;
emu->page_ptr_table[page] = NULL;
}
return -ENOMEM;
}
/*
@ -481,23 +484,10 @@ static int synth_alloc_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk
*/
static int synth_free_pages(struct snd_emu10k1 *emu, struct snd_emu10k1_memblk *blk)
{
int page, first_page, last_page;
struct snd_dma_buffer dmab;
int first_page, last_page;
get_single_page_range(emu->memhdr, blk, &first_page, &last_page);
dmab.dev.type = SNDRV_DMA_TYPE_DEV;
dmab.dev.dev = snd_dma_pci_data(emu->pci);
for (page = first_page; page <= last_page; page++) {
if (emu->page_ptr_table[page] == NULL)
continue;
dmab.area = emu->page_ptr_table[page];
dmab.addr = emu->page_addr_table[page];
dmab.bytes = PAGE_SIZE;
snd_dma_free_pages(&dmab);
emu->page_addr_table[page] = 0;
emu->page_ptr_table[page] = NULL;
}
__synth_free_pages(emu, first_page, last_page);
return 0;
}