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ALSA: memalloc: Support WC allocation on all architectures 

There are the generic DMA API calls for allocating and managing the
pages with the write-combined attribute.  Let's use them for all
architectures but x86; x86 still needs the special handling to
override the page attributes.

Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20210802072815.13551-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2021-08-02 09:28:04 +02:00
parent ac9245a540
commit d5c5055816
1 changed files with 39 additions and 7 deletions
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46
sound/core/memalloc.c
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@ -373,19 +373,20 @@ static const struct snd_malloc_ops snd_dma_iram_ops = {
};
#endif /* CONFIG_GENERIC_ALLOCATOR */
#define DEFAULT_GFP \
(GFP_KERNEL | \
__GFP_COMP | /* compound page lets parts be mapped */ \
__GFP_NORETRY | /* don't trigger OOM-killer */ \
__GFP_NOWARN) /* no stack trace print - this call is non-critical */
/*
* Coherent device pages allocator
*/
static void *snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
{
gfp_t gfp_flags;
void *p;
gfp_flags = GFP_KERNEL
| __GFP_COMP /* compound page lets parts be mapped */
| __GFP_NORETRY /* don't trigger OOM-killer */
| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
p = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, gfp_flags);
p = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
#ifdef CONFIG_X86
if (p && dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC)
set_memory_wc((unsigned long)p, PAGE_ALIGN(size) >> PAGE_SHIFT);
@ -415,6 +416,37 @@ static const struct snd_malloc_ops snd_dma_dev_ops = {
.free = snd_dma_dev_free,
.mmap = snd_dma_dev_mmap,
};
/*
* Write-combined pages
*/
#ifdef CONFIG_X86
/* On x86, share the same ops as the standard dev ops */
#define snd_dma_wc_ops snd_dma_dev_ops
#else /* CONFIG_X86 */
static void *snd_dma_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
{
return dma_alloc_wc(dmab->dev.dev, size, &dmab->addr, DEFAULT_GFP);
}
static void snd_dma_wc_free(struct snd_dma_buffer *dmab)
{
dma_free_wc(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
}
static int snd_dma_wc_mmap(struct snd_dma_buffer *dmab,
struct vm_area_struct *area)
{
return dma_mmap_wc(dmab->dev.dev, area,
dmab->area, dmab->addr, dmab->bytes);
}
static const struct snd_malloc_ops snd_dma_wc_ops = {
.alloc = snd_dma_wc_alloc,
.free = snd_dma_wc_free,
.mmap = snd_dma_wc_mmap,
};
#endif /* CONFIG_X86 */
#endif /* CONFIG_HAS_DMA */
/*
@ -425,7 +457,7 @@ static const struct snd_malloc_ops *dma_ops[] = {
[SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops,
#ifdef CONFIG_HAS_DMA
[SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops,
[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_dev_ops,
[SNDRV_DMA_TYPE_DEV_WC] = &snd_dma_wc_ops,
#ifdef CONFIG_GENERIC_ALLOCATOR
[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
#endif /* CONFIG_GENERIC_ALLOCATOR */