From 51e9f2e665bf2b6a01be275d64c336d942c59a66 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 30 Jul 2008 15:13:33 +0200 Subject: [PATCH] ALSA: Allocate larger pages in sgbuf Most hardwares have limited buffer-descriptor table length. This also restricts the max buffer size of the sound driver. For example, snd-hda-intel has 1MB buffer size limit, and this is because it can have at most 256 BDL entries. For supporting larger buffers, we need to allocate larger pages even for sg-buffers. This patch changes the sgbuf allocation code to try to allocate larger pages first. At each head of the allocated pages, the number of allocated pages is stored in the lowest bits of the corresponding entry of the table addr field. This change isn't visible as long as the driver uses snd_sgbuf_get_addr() helper. Also, the patch adds a new function, snd_pcm_sgbuf_get_chunk_size(). This returns the size of the chunk on continuous pages starting at the given position offset. If the chunk reaches to a non-continuous page, it returns the size to the boundary. Signed-off-by: Takashi Iwai Signed-off-by: Jaroslav Kysela --- include/sound/memalloc.h | 4 ++- include/sound/pcm.h | 3 +- sound/core/pcm_memory.c | 26 +++++++++++++++++ sound/core/sgbuf.c | 62 +++++++++++++++++++++++++++++----------- 4 files changed, 77 insertions(+), 18 deletions(-) diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h index 96d0dc17145..d787a6b4a10 100644 --- a/include/sound/memalloc.h +++ b/include/sound/memalloc.h @@ -97,7 +97,9 @@ static inline unsigned int snd_sgbuf_aligned_pages(size_t size) */ static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset) { - return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE; + dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr; + addr &= PAGE_MASK; + return addr + offset % PAGE_SIZE; } /* diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 8db89630c82..40c5a6fa6bc 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -996,7 +996,8 @@ snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs) struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigned long offset); - +unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, + unsigned int ofs, unsigned int size); /* handle mmap counter - PCM mmap callback should handle this counter properly */ static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area) diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c index 859b1185e69..a6d42808828 100644 --- a/sound/core/pcm_memory.c +++ b/sound/core/pcm_memory.c @@ -324,6 +324,32 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); +/* + * compute the max chunk size with continuous pages on sg-buffer + */ +unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream, + unsigned int ofs, unsigned int size) +{ + struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream); + unsigned int start, end, pg; + + start = ofs >> PAGE_SHIFT; + end = (ofs + size - 1) >> PAGE_SHIFT; + /* check page continuity */ + pg = sg->table[start].addr >> PAGE_SHIFT; + for (;;) { + start++; + if (start > end) + break; + pg++; + if ((sg->table[start].addr >> PAGE_SHIFT) != pg) + return (start << PAGE_SHIFT) - ofs; + } + /* ok, all on continuous pages */ + return size; +} +EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size); + /** * snd_pcm_lib_malloc_pages - allocate the DMA buffer * @substream: the substream to allocate the DMA buffer to diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c index cefd228cd2a..d4564edd61d 100644 --- a/sound/core/sgbuf.c +++ b/sound/core/sgbuf.c @@ -41,9 +41,11 @@ int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab) tmpb.dev.type = SNDRV_DMA_TYPE_DEV; tmpb.dev.dev = sgbuf->dev; for (i = 0; i < sgbuf->pages; i++) { + if (!(sgbuf->table[i].addr & ~PAGE_MASK)) + continue; /* continuous pages */ tmpb.area = sgbuf->table[i].buf; - tmpb.addr = sgbuf->table[i].addr; - tmpb.bytes = PAGE_SIZE; + tmpb.addr = sgbuf->table[i].addr & PAGE_MASK; + tmpb.bytes = (sgbuf->table[i].addr & ~PAGE_MASK) << PAGE_SHIFT; snd_dma_free_pages(&tmpb); } if (dmab->area) @@ -58,13 +60,17 @@ int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab) return 0; } +#define MAX_ALLOC_PAGES 32 + void *snd_malloc_sgbuf_pages(struct device *device, size_t size, struct snd_dma_buffer *dmab, size_t *res_size) { struct snd_sg_buf *sgbuf; - unsigned int i, pages; + unsigned int i, pages, chunk, maxpages; struct snd_dma_buffer tmpb; + struct snd_sg_page *table; + struct page **pgtable; dmab->area = NULL; dmab->addr = 0; @@ -74,31 +80,55 @@ void *snd_malloc_sgbuf_pages(struct device *device, sgbuf->dev = device; pages = snd_sgbuf_aligned_pages(size); sgbuf->tblsize = sgbuf_align_table(pages); - sgbuf->table = kcalloc(sgbuf->tblsize, sizeof(*sgbuf->table), GFP_KERNEL); - if (! sgbuf->table) + table = kcalloc(sgbuf->tblsize, sizeof(*table), GFP_KERNEL); + if (!table) goto _failed; - sgbuf->page_table = kcalloc(sgbuf->tblsize, sizeof(*sgbuf->page_table), GFP_KERNEL); - if (! sgbuf->page_table) + sgbuf->table = table; + pgtable = kcalloc(sgbuf->tblsize, sizeof(*pgtable), GFP_KERNEL); + if (!pgtable) goto _failed; + sgbuf->page_table = pgtable; - /* allocate each page */ - for (i = 0; i < pages; i++) { - if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, device, PAGE_SIZE, &tmpb) < 0) { - if (res_size == NULL) + /* allocate pages */ + maxpages = MAX_ALLOC_PAGES; + while (pages > 0) { + chunk = pages; + /* don't be too eager to take a huge chunk */ + if (chunk > maxpages) + chunk = maxpages; + chunk <<= PAGE_SHIFT; + if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, device, + chunk, &tmpb) < 0) { + if (!sgbuf->pages) + return NULL; + if (!res_size) goto _failed; - *res_size = size = sgbuf->pages * PAGE_SIZE; + size = sgbuf->pages * PAGE_SIZE; break; } - sgbuf->table[i].buf = tmpb.area; - sgbuf->table[i].addr = tmpb.addr; - sgbuf->page_table[i] = virt_to_page(tmpb.area); - sgbuf->pages++; + chunk = tmpb.bytes >> PAGE_SHIFT; + for (i = 0; i < chunk; i++) { + table->buf = tmpb.area; + table->addr = tmpb.addr; + if (!i) + table->addr |= chunk; /* mark head */ + table++; + *pgtable++ = virt_to_page(tmpb.area); + tmpb.area += PAGE_SIZE; + tmpb.addr += PAGE_SIZE; + } + sgbuf->pages += chunk; + pages -= chunk; + if (chunk < maxpages) + maxpages = chunk; } sgbuf->size = size; dmab->area = vmap(sgbuf->page_table, sgbuf->pages, VM_MAP, PAGE_KERNEL); if (! dmab->area) goto _failed; + if (res_size) + *res_size = sgbuf->size; return dmab->area; _failed: -- 2.41.1