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e469e2045f
The recent changes in IOMMU made the non-contiguous page allocations as default, hence we can simply use the standard DMA allocation for the S/G pages as well. In this patch, we simplify the code by trying the standard DMA allocation at first, instead of dma_alloc_noncontiguous(). For the case without IOMMU, we still need to manage the S/G pages manually, so we keep the same fallback routines like before. The fallback types (SNDRV_DMA_TYPE_DEV_SG_FALLBACK & co) are dropped / folded into SNDRV_DMA_TYPE_DEV_SG and co now. The allocation via the standard DMA call overrides the type accordingly, hence we don't have to have extra fallback types any longer. OTOH, SNDRV_DMA_TYPE_DEV_SG is no longer an alias but became its own type back again. Note that this patch requires another prerequisite fix for memmalloc helper to use the DMA API for WC pages on x86. Link: https://bugzilla.kernel.org/show_bug.cgi?id=219087 Link: https://patch.msgid.link/20240801064808.31205-2-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
121 lines
3.6 KiB
C
121 lines
3.6 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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/*
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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 3 /* S/G pages */
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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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