diff options
| author | Takashi Iwai <tiwai@suse.de> | 2021-06-09 18:25:51 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2021-06-10 10:15:21 +0200 |
| commit | 30b7ba6972d59cdf3ffce161ab9005a5f7562f9f (patch) | |
| tree | afd4532fa65453e22d32e598e3aa528934f87786 /sound | |
| parent | a202bd1ad86d59c07f24f0a201c5ade320b51e30 (diff) | |
ALSA: core: Add continuous and vmalloc mmap ops
The mmap of continuous pages and vmalloc'ed pages are relatively
easily done in a shot with the existing helper functions.
Implement the mmap ops for those types, so that the mmap works without
relying on the page fault handling.
Link: https://lore.kernel.org/r/20210609162551.7842-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
| -rw-r--r-- | sound/core/memalloc.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c index bdcb9230acf8..83b79edfa52d 100644 --- a/sound/core/memalloc.c +++ b/sound/core/memalloc.c @@ -211,9 +211,19 @@ static void snd_dma_continuous_free(struct snd_dma_buffer *dmab) free_pages_exact(dmab->area, dmab->bytes); } +static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + return remap_pfn_range(area, area->vm_start, + dmab->addr >> PAGE_SHIFT, + area->vm_end - area->vm_start, + area->vm_page_prot); +} + static const struct snd_malloc_ops snd_dma_continuous_ops = { .alloc = snd_dma_continuous_alloc, .free = snd_dma_continuous_free, + .mmap = snd_dma_continuous_mmap, }; /* @@ -232,6 +242,12 @@ static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab) vfree(dmab->area); } +static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab, + struct vm_area_struct *area) +{ + return remap_vmalloc_range(area, dmab->area, 0); +} + static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab, size_t offset) { @@ -259,6 +275,7 @@ snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab, static const struct snd_malloc_ops snd_dma_vmalloc_ops = { .alloc = snd_dma_vmalloc_alloc, .free = snd_dma_vmalloc_free, + .mmap = snd_dma_vmalloc_mmap, .get_addr = snd_dma_vmalloc_get_addr, .get_page = snd_dma_vmalloc_get_page, .get_chunk_size = snd_dma_vmalloc_get_chunk_size, |