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-rw-r--r--sound/core/memalloc.c111
1 files changed, 110 insertions, 1 deletions
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 6fd763d4d15b..15dc7160ba34 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -499,6 +499,10 @@ static const struct snd_malloc_ops snd_dma_wc_ops = {
};
#endif /* CONFIG_X86 */
+#ifdef CONFIG_SND_DMA_SGBUF
+static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size);
+#endif
+
/*
* Non-contiguous pages allocator
*/
@@ -509,8 +513,18 @@ static void *snd_dma_noncontig_alloc(struct snd_dma_buffer *dmab, size_t size)
sgt = dma_alloc_noncontiguous(dmab->dev.dev, size, dmab->dev.dir,
DEFAULT_GFP, 0);
- if (!sgt)
+ if (!sgt) {
+#ifdef CONFIG_SND_DMA_SGBUF
+ if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG)
+ dmab->dev.type = SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK;
+ else
+ dmab->dev.type = SNDRV_DMA_TYPE_DEV_SG_FALLBACK;
+ return snd_dma_sg_fallback_alloc(dmab, size);
+#else
return NULL;
+#endif
+ }
+
dmab->dev.need_sync = dma_need_sync(dmab->dev.dev,
sg_dma_address(sgt->sgl));
p = dma_vmap_noncontiguous(dmab->dev.dev, size, sgt);
@@ -633,6 +647,8 @@ static void *snd_dma_sg_wc_alloc(struct snd_dma_buffer *dmab, size_t size)
if (!p)
return NULL;
+ if (dmab->dev.type != SNDRV_DMA_TYPE_DEV_WC_SG)
+ return p;
for_each_sgtable_page(sgt, &iter, 0)
set_memory_wc(sg_wc_address(&iter), 1);
return p;
@@ -665,6 +681,95 @@ static const struct snd_malloc_ops snd_dma_sg_wc_ops = {
.get_page = snd_dma_noncontig_get_page,
.get_chunk_size = snd_dma_noncontig_get_chunk_size,
};
+
+/* Fallback SG-buffer allocations for x86 */
+struct snd_dma_sg_fallback {
+ size_t count;
+ struct page **pages;
+ dma_addr_t *addrs;
+};
+
+static void __snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab,
+ struct snd_dma_sg_fallback *sgbuf)
+{
+ size_t i;
+
+ if (sgbuf->count && dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
+ set_pages_array_wb(sgbuf->pages, sgbuf->count);
+ for (i = 0; i < sgbuf->count && sgbuf->pages[i]; i++)
+ dma_free_coherent(dmab->dev.dev, PAGE_SIZE,
+ page_address(sgbuf->pages[i]),
+ sgbuf->addrs[i]);
+ kvfree(sgbuf->pages);
+ kvfree(sgbuf->addrs);
+ kfree(sgbuf);
+}
+
+static void *snd_dma_sg_fallback_alloc(struct snd_dma_buffer *dmab, size_t size)
+{
+ struct snd_dma_sg_fallback *sgbuf;
+ struct page **pages;
+ size_t i, count;
+ void *p;
+
+ sgbuf = kzalloc(sizeof(*sgbuf), GFP_KERNEL);
+ if (!sgbuf)
+ return NULL;
+ count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+ pages = kvcalloc(count, sizeof(*pages), GFP_KERNEL);
+ if (!pages)
+ goto error;
+ sgbuf->pages = pages;
+ sgbuf->addrs = kvcalloc(count, sizeof(*sgbuf->addrs), GFP_KERNEL);
+ if (!sgbuf->addrs)
+ goto error;
+
+ for (i = 0; i < count; sgbuf->count++, i++) {
+ p = dma_alloc_coherent(dmab->dev.dev, PAGE_SIZE,
+ &sgbuf->addrs[i], DEFAULT_GFP);
+ if (!p)
+ goto error;
+ sgbuf->pages[i] = virt_to_page(p);
+ }
+
+ if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
+ set_pages_array_wc(pages, count);
+ p = vmap(pages, count, VM_MAP, PAGE_KERNEL);
+ if (!p)
+ goto error;
+ dmab->private_data = sgbuf;
+ return p;
+
+ error:
+ __snd_dma_sg_fallback_free(dmab, sgbuf);
+ return NULL;
+}
+
+static void snd_dma_sg_fallback_free(struct snd_dma_buffer *dmab)
+{
+ vunmap(dmab->area);
+ __snd_dma_sg_fallback_free(dmab, dmab->private_data);
+}
+
+static int snd_dma_sg_fallback_mmap(struct snd_dma_buffer *dmab,
+ struct vm_area_struct *area)
+{
+ struct snd_dma_sg_fallback *sgbuf = dmab->private_data;
+
+ if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK)
+ area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
+ return vm_map_pages(area, sgbuf->pages, sgbuf->count);
+}
+
+static const struct snd_malloc_ops snd_dma_sg_fallback_ops = {
+ .alloc = snd_dma_sg_fallback_alloc,
+ .free = snd_dma_sg_fallback_free,
+ .mmap = snd_dma_sg_fallback_mmap,
+ /* reuse vmalloc helpers */
+ .get_addr = snd_dma_vmalloc_get_addr,
+ .get_page = snd_dma_vmalloc_get_page,
+ .get_chunk_size = snd_dma_vmalloc_get_chunk_size,
+};
#endif /* CONFIG_SND_DMA_SGBUF */
/*
@@ -736,6 +841,10 @@ static const struct snd_malloc_ops *dma_ops[] = {
#ifdef CONFIG_GENERIC_ALLOCATOR
[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
#endif /* CONFIG_GENERIC_ALLOCATOR */
+#ifdef CONFIG_SND_DMA_SGBUF
+ [SNDRV_DMA_TYPE_DEV_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
+ [SNDRV_DMA_TYPE_DEV_WC_SG_FALLBACK] = &snd_dma_sg_fallback_ops,
+#endif
#endif /* CONFIG_HAS_DMA */
};