forked from Minki/linux
2c95b92ecd
This is a second attempt to unify the x86-specific SG-buffer handling
code with the new standard non-contiguous page handler.
The first try (in commit 2d9ea39917) failed due to the wrong page
and address calculations, hence reverted. (And the second try failed
due to a copy&paste error.) Now it's corrected with the previous fix
for noncontig pages, and the proper sg page iteration by this patch.
After the migration, SNDRV_DMA_TYPE_DMA_SG becomes identical with
SNDRV_DMA_TYPE_NONCONTIG on x86, while others still fall back to
SNDRV_DMA_TYPE_DEV.
Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Tested-by: Harald Arnesen <harald@skogtun.org>
Link: https://lore.kernel.org/r/20211017074859.24112-4-tiwai@suse.de
Link: https://lore.kernel.org/r/20211109062235.22310-1-tiwai@suse.de
Link: https://lore.kernel.org/r/20211116073358.19741-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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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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#ifndef __SOUND_MEMALLOC_H
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#define __SOUND_MEMALLOC_H
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#include <linux/dma-direction.h>
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#include <asm/page.h>
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struct device;
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struct vm_area_struct;
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struct sg_table;
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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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enum dma_data_direction dir; /* DMA direction */
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bool need_sync; /* explicit sync needed? */
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struct device *dev; /* generic device */
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};
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#define snd_dma_continuous_data(x) ((struct device *)(__force unsigned long)(x))
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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_WC 5 /* continuous write-combined */
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#ifdef CONFIG_GENERIC_ALLOCATOR
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#define SNDRV_DMA_TYPE_DEV_IRAM 4 /* generic device iram-buffer */
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#else
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#define SNDRV_DMA_TYPE_DEV_IRAM SNDRV_DMA_TYPE_DEV
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#endif
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#define SNDRV_DMA_TYPE_VMALLOC 7 /* vmalloc'ed buffer */
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#define SNDRV_DMA_TYPE_NONCONTIG 8 /* non-coherent SG buffer */
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#define SNDRV_DMA_TYPE_NONCOHERENT 9 /* non-coherent buffer */
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#ifdef CONFIG_SND_DMA_SGBUF
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_NONCONTIG
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#define SNDRV_DMA_TYPE_DEV_WC_SG 6 /* SG write-combined */
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#else
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#define SNDRV_DMA_TYPE_DEV_SG SNDRV_DMA_TYPE_DEV /* no SG-buf support */
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#define SNDRV_DMA_TYPE_DEV_WC_SG SNDRV_DMA_TYPE_DEV_WC
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#endif
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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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* 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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/* allocate/release a buffer */
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int snd_dma_alloc_dir_pages(int type, struct device *dev,
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enum dma_data_direction dir, size_t size,
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struct snd_dma_buffer *dmab);
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static inline int snd_dma_alloc_pages(int type, struct device *dev,
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size_t size, struct snd_dma_buffer *dmab)
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{
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return snd_dma_alloc_dir_pages(type, dev, DMA_BIDIRECTIONAL, size, dmab);
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}
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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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int snd_dma_buffer_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area);
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enum snd_dma_sync_mode { SNDRV_DMA_SYNC_CPU, SNDRV_DMA_SYNC_DEVICE };
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#ifdef CONFIG_HAS_DMA
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void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
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enum snd_dma_sync_mode mode);
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#else
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static inline void snd_dma_buffer_sync(struct snd_dma_buffer *dmab,
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enum snd_dma_sync_mode mode) {}
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#endif
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dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset);
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struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset);
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unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
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unsigned int ofs, unsigned int size);
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/* device-managed memory allocator */
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struct snd_dma_buffer *snd_devm_alloc_dir_pages(struct device *dev, int type,
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enum dma_data_direction dir,
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size_t size);
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static inline struct snd_dma_buffer *
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snd_devm_alloc_pages(struct device *dev, int type, size_t size)
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{
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return snd_devm_alloc_dir_pages(dev, type, DMA_BIDIRECTIONAL, size);
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}
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static inline struct sg_table *
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snd_dma_noncontig_sg_table(struct snd_dma_buffer *dmab)
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{
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return dmab->private_data;
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}
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#endif /* __SOUND_MEMALLOC_H */
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