From a202bd1ad86d59c07f24f0a201c5ade320b51e30 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Wed, 9 Jun 2021 18:25:50 +0200
Subject: ALSA: core: Move mmap handler into memalloc ops
This patch moves the mmap handling code into the common memalloc
handler. It allows us to reduce the memory-type specific code in PCM
code gracefully.
Link: https://lore.kernel.org/r/20210609162551.7842-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/memalloc.c | 36 ++++++++++++++++++++++++++++++++++++
1 file changed, 36 insertions(+)
(limited to 'sound/core/memalloc.c')
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index ad68bcdf82cf..bdcb9230acf8 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -127,6 +127,23 @@ void snd_dma_free_pages(struct snd_dma_buffer *dmab)
}
EXPORT_SYMBOL(snd_dma_free_pages);
+/**
+ * snd_dma_buffer_mmap - perform mmap of the given DMA buffer
+ * @dmab: buffer allocation information
+ * @area: VM area information
+ */
+int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
+
+ if (ops && ops->mmap)
+ return ops->mmap(dmab, area);
+ else
+ return -ENOENT;
+}
+EXPORT_SYMBOL(snd_dma_buffer_mmap);
+
/**
* snd_sgbuf_get_addr - return the physical address at the corresponding offset
* @dmab: buffer allocation information
@@ -283,9 +300,20 @@ static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
}
+static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
+ 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_iram_ops = {
.alloc = snd_dma_iram_alloc,
.free = snd_dma_iram_free,
+ .mmap = snd_dma_iram_mmap,
};
#endif /* CONFIG_GENERIC_ALLOCATOR */
@@ -320,9 +348,17 @@ static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
}
+static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ return dma_mmap_coherent(dmab->dev.dev, area,
+ dmab->area, dmab->addr, dmab->bytes);
+}
+
static const struct snd_malloc_ops snd_dma_dev_ops = {
.alloc = snd_dma_dev_alloc,
.free = snd_dma_dev_free,
+ .mmap = snd_dma_dev_mmap,
};
#endif /* CONFIG_HAS_DMA */
--
cgit