forked from luck/tmp_suning_uos_patched
51e9f2e665
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 <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Takashi Iwai <tiwai@suse.de>
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*
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* Generic memory allocators
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __SOUND_MEMALLOC_H
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#define __SOUND_MEMALLOC_H
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struct device;
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/*
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* buffer device info
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*/
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struct snd_dma_device {
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int type; /* SNDRV_DMA_TYPE_XXX */
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struct device *dev; /* generic device */
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};
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#ifndef snd_dma_pci_data
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#define snd_dma_pci_data(pci) (&(pci)->dev)
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#define snd_dma_isa_data() NULL
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#define snd_dma_sbus_data(sbus) ((struct device *)(sbus))
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#define snd_dma_continuous_data(x) ((struct device *)(unsigned long)(x))
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#endif
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/*
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* buffer types
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*/
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#define SNDRV_DMA_TYPE_UNKNOWN 0 /* not defined */
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#define SNDRV_DMA_TYPE_CONTINUOUS 1 /* continuous no-DMA memory */
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#define SNDRV_DMA_TYPE_DEV 2 /* generic device continuous */
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#define SNDRV_DMA_TYPE_DEV_SG 3 /* generic device SG-buffer */
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#define SNDRV_DMA_TYPE_SBUS 4 /* SBUS continuous */
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/*
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* info for buffer allocation
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*/
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struct snd_dma_buffer {
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struct snd_dma_device dev; /* device type */
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unsigned char *area; /* virtual pointer */
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dma_addr_t addr; /* physical address */
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size_t bytes; /* buffer size in bytes */
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void *private_data; /* private for allocator; don't touch */
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};
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/*
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* Scatter-Gather generic device pages
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*/
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void *snd_malloc_sgbuf_pages(struct device *device,
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size_t size, struct snd_dma_buffer *dmab,
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size_t *res_size);
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int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
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struct snd_sg_page {
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void *buf;
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dma_addr_t addr;
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};
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struct snd_sg_buf {
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int size; /* allocated byte size */
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int pages; /* allocated pages */
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int tblsize; /* allocated table size */
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struct snd_sg_page *table; /* address table */
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struct page **page_table; /* page table (for vmap/vunmap) */
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struct device *dev;
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};
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/*
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* return the pages matching with the given byte size
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*/
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static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
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{
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return (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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/*
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* return the physical address at the corresponding offset
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*/
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static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
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{
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dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
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addr &= PAGE_MASK;
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return addr + offset % PAGE_SIZE;
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}
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/*
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* return the virtual address at the corresponding offset
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*/
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static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
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{
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return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
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}
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/* allocate/release a buffer */
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int snd_dma_alloc_pages(int type, struct device *dev, size_t size,
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struct snd_dma_buffer *dmab);
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int snd_dma_alloc_pages_fallback(int type, struct device *dev, size_t size,
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struct snd_dma_buffer *dmab);
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void snd_dma_free_pages(struct snd_dma_buffer *dmab);
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/* buffer-preservation managements */
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#define snd_dma_pci_buf_id(pci) (((unsigned int)(pci)->vendor << 16) | (pci)->device)
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size_t snd_dma_get_reserved_buf(struct snd_dma_buffer *dmab, unsigned int id);
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int snd_dma_reserve_buf(struct snd_dma_buffer *dmab, unsigned int id);
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/* basic memory allocation functions */
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void *snd_malloc_pages(size_t size, gfp_t gfp_flags);
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void snd_free_pages(void *ptr, size_t size);
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#endif /* __SOUND_MEMALLOC_H */
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