408 lines
11 KiB
C
408 lines
11 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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#include <linux/slab.h>
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#include <linux/mm.h>
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#include <linux/dma-mapping.h>
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#include <linux/genalloc.h>
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#include <linux/vmalloc.h>
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#ifdef CONFIG_X86
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#include <asm/set_memory.h>
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#endif
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#include <sound/memalloc.h>
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#include "memalloc_local.h"
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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab);
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/* a cast to gfp flag from the dev pointer; for CONTINUOUS and VMALLOC types */
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static inline gfp_t snd_mem_get_gfp_flags(const struct snd_dma_buffer *dmab,
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gfp_t default_gfp)
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{
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if (!dmab->dev.dev)
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return default_gfp;
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else
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return (__force gfp_t)(unsigned long)dmab->dev.dev;
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}
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static int __snd_dma_alloc_pages(struct snd_dma_buffer *dmab, size_t size)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (WARN_ON_ONCE(!ops || !ops->alloc))
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return -EINVAL;
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return ops->alloc(dmab, size);
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}
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/**
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* snd_dma_alloc_pages - allocate the buffer area according to the given type
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* @type: the DMA buffer type
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* @device: the device pointer
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type.
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*
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* Return: Zero if the buffer with the given size is allocated successfully,
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* otherwise a negative value on error.
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*/
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int snd_dma_alloc_pages(int type, struct device *device, size_t size,
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struct snd_dma_buffer *dmab)
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{
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int err;
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if (WARN_ON(!size))
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return -ENXIO;
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if (WARN_ON(!dmab))
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return -ENXIO;
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size = PAGE_ALIGN(size);
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dmab->dev.type = type;
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dmab->dev.dev = device;
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dmab->bytes = 0;
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dmab->area = NULL;
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dmab->addr = 0;
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dmab->private_data = NULL;
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err = __snd_dma_alloc_pages(dmab, size);
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if (err < 0)
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return err;
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if (!dmab->area)
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return -ENOMEM;
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dmab->bytes = size;
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return 0;
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}
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EXPORT_SYMBOL(snd_dma_alloc_pages);
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/**
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* snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback
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* @type: the DMA buffer type
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* @device: the device pointer
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* @size: the buffer size to allocate
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* @dmab: buffer allocation record to store the allocated data
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*
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* Calls the memory-allocator function for the corresponding
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* buffer type. When no space is left, this function reduces the size and
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* tries to allocate again. The size actually allocated is stored in
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* res_size argument.
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*
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* Return: Zero if the buffer with the given size is allocated successfully,
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* otherwise a negative value on error.
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*/
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int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,
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struct snd_dma_buffer *dmab)
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{
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int err;
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while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {
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if (err != -ENOMEM)
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return err;
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if (size <= PAGE_SIZE)
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return -ENOMEM;
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size >>= 1;
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size = PAGE_SIZE << get_order(size);
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}
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if (! dmab->area)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);
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/**
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* snd_dma_free_pages - release the allocated buffer
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* @dmab: the buffer allocation record to release
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*
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* Releases the allocated buffer via snd_dma_alloc_pages().
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*/
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void snd_dma_free_pages(struct snd_dma_buffer *dmab)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->free)
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ops->free(dmab);
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}
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EXPORT_SYMBOL(snd_dma_free_pages);
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/**
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* snd_dma_buffer_mmap - perform mmap of the given DMA buffer
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* @dmab: buffer allocation information
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* @area: VM area information
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*/
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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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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->mmap)
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return ops->mmap(dmab, area);
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else
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return -ENOENT;
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}
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EXPORT_SYMBOL(snd_dma_buffer_mmap);
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/**
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* snd_sgbuf_get_addr - return the physical address at the corresponding offset
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* @dmab: buffer allocation information
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* @offset: offset in the ring buffer
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*/
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dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab, size_t offset)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_addr)
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return ops->get_addr(dmab, offset);
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else
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return dmab->addr + offset;
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}
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EXPORT_SYMBOL(snd_sgbuf_get_addr);
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/**
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* snd_sgbuf_get_page - return the physical page at the corresponding offset
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* @dmab: buffer allocation information
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* @offset: offset in the ring buffer
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*/
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struct page *snd_sgbuf_get_page(struct snd_dma_buffer *dmab, size_t offset)
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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_page)
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return ops->get_page(dmab, offset);
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else
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return virt_to_page(dmab->area + offset);
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}
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EXPORT_SYMBOL(snd_sgbuf_get_page);
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/**
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* snd_sgbuf_get_chunk_size - compute the max chunk size with continuous pages
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* on sg-buffer
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* @dmab: buffer allocation information
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* @ofs: offset in the ring buffer
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* @size: the requested size
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*/
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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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{
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const struct snd_malloc_ops *ops = snd_dma_get_ops(dmab);
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if (ops && ops->get_chunk_size)
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return ops->get_chunk_size(dmab, ofs, size);
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else
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return size;
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}
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EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);
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/*
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* Continuous pages allocator
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*/
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static int snd_dma_continuous_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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gfp_t gfp = snd_mem_get_gfp_flags(dmab, GFP_KERNEL);
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dmab->area = alloc_pages_exact(size, gfp);
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return 0;
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}
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static void snd_dma_continuous_free(struct snd_dma_buffer *dmab)
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{
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free_pages_exact(dmab->area, dmab->bytes);
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}
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static int snd_dma_continuous_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return remap_pfn_range(area, area->vm_start,
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dmab->addr >> PAGE_SHIFT,
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area->vm_end - area->vm_start,
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area->vm_page_prot);
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}
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static const struct snd_malloc_ops snd_dma_continuous_ops = {
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.alloc = snd_dma_continuous_alloc,
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.free = snd_dma_continuous_free,
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.mmap = snd_dma_continuous_mmap,
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};
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/*
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* VMALLOC allocator
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*/
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static int snd_dma_vmalloc_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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gfp_t gfp = snd_mem_get_gfp_flags(dmab, GFP_KERNEL | __GFP_HIGHMEM);
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dmab->area = __vmalloc(size, gfp);
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return 0;
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}
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static void snd_dma_vmalloc_free(struct snd_dma_buffer *dmab)
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{
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vfree(dmab->area);
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}
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static int snd_dma_vmalloc_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return remap_vmalloc_range(area, dmab->area, 0);
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}
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static dma_addr_t snd_dma_vmalloc_get_addr(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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return page_to_phys(vmalloc_to_page(dmab->area + offset)) +
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offset % PAGE_SIZE;
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}
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static struct page *snd_dma_vmalloc_get_page(struct snd_dma_buffer *dmab,
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size_t offset)
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{
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return vmalloc_to_page(dmab->area + offset);
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}
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static unsigned int
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snd_dma_vmalloc_get_chunk_size(struct snd_dma_buffer *dmab,
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unsigned int ofs, unsigned int size)
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{
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ofs %= PAGE_SIZE;
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size += ofs;
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if (size > PAGE_SIZE)
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size = PAGE_SIZE;
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return size - ofs;
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}
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static const struct snd_malloc_ops snd_dma_vmalloc_ops = {
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.alloc = snd_dma_vmalloc_alloc,
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.free = snd_dma_vmalloc_free,
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.mmap = snd_dma_vmalloc_mmap,
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.get_addr = snd_dma_vmalloc_get_addr,
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.get_page = snd_dma_vmalloc_get_page,
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.get_chunk_size = snd_dma_vmalloc_get_chunk_size,
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};
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#ifdef CONFIG_HAS_DMA
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/*
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* IRAM allocator
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*/
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#ifdef CONFIG_GENERIC_ALLOCATOR
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static int snd_dma_iram_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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struct device *dev = dmab->dev.dev;
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struct gen_pool *pool;
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if (dev->of_node) {
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pool = of_gen_pool_get(dev->of_node, "iram", 0);
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/* Assign the pool into private_data field */
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dmab->private_data = pool;
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dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
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PAGE_SIZE);
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if (dmab->area)
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return 0;
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}
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/* Internal memory might have limited size and no enough space,
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* so if we fail to malloc, try to fetch memory traditionally.
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*/
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dmab->dev.type = SNDRV_DMA_TYPE_DEV;
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return __snd_dma_alloc_pages(dmab, size);
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}
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static void snd_dma_iram_free(struct snd_dma_buffer *dmab)
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{
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struct gen_pool *pool = dmab->private_data;
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if (pool && dmab->area)
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gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);
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}
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static int snd_dma_iram_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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area->vm_page_prot = pgprot_writecombine(area->vm_page_prot);
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return remap_pfn_range(area, area->vm_start,
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dmab->addr >> PAGE_SHIFT,
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area->vm_end - area->vm_start,
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area->vm_page_prot);
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}
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static const struct snd_malloc_ops snd_dma_iram_ops = {
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.alloc = snd_dma_iram_alloc,
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.free = snd_dma_iram_free,
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.mmap = snd_dma_iram_mmap,
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};
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#endif /* CONFIG_GENERIC_ALLOCATOR */
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/*
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* Coherent device pages allocator
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*/
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static int snd_dma_dev_alloc(struct snd_dma_buffer *dmab, size_t size)
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{
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gfp_t gfp_flags;
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gfp_flags = GFP_KERNEL
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| __GFP_COMP /* compound page lets parts be mapped */
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| __GFP_NORETRY /* don't trigger OOM-killer */
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| __GFP_NOWARN; /* no stack trace print - this call is non-critical */
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dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,
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gfp_flags);
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#ifdef CONFIG_X86
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if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
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set_memory_wc((unsigned long)dmab->area,
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PAGE_ALIGN(size) >> PAGE_SHIFT);
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#endif
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return 0;
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}
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static void snd_dma_dev_free(struct snd_dma_buffer *dmab)
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{
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#ifdef CONFIG_X86
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if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)
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set_memory_wb((unsigned long)dmab->area,
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PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);
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#endif
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dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);
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}
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static int snd_dma_dev_mmap(struct snd_dma_buffer *dmab,
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struct vm_area_struct *area)
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{
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return dma_mmap_coherent(dmab->dev.dev, area,
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dmab->area, dmab->addr, dmab->bytes);
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}
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static const struct snd_malloc_ops snd_dma_dev_ops = {
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.alloc = snd_dma_dev_alloc,
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.free = snd_dma_dev_free,
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.mmap = snd_dma_dev_mmap,
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};
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#endif /* CONFIG_HAS_DMA */
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/*
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* Entry points
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*/
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static const struct snd_malloc_ops *dma_ops[] = {
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[SNDRV_DMA_TYPE_CONTINUOUS] = &snd_dma_continuous_ops,
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[SNDRV_DMA_TYPE_VMALLOC] = &snd_dma_vmalloc_ops,
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#ifdef CONFIG_HAS_DMA
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[SNDRV_DMA_TYPE_DEV] = &snd_dma_dev_ops,
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[SNDRV_DMA_TYPE_DEV_UC] = &snd_dma_dev_ops,
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#ifdef CONFIG_GENERIC_ALLOCATOR
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[SNDRV_DMA_TYPE_DEV_IRAM] = &snd_dma_iram_ops,
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#endif /* CONFIG_GENERIC_ALLOCATOR */
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#endif /* CONFIG_HAS_DMA */
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#ifdef CONFIG_SND_DMA_SGBUF
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[SNDRV_DMA_TYPE_DEV_SG] = &snd_dma_sg_ops,
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[SNDRV_DMA_TYPE_DEV_UC_SG] = &snd_dma_sg_ops,
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#endif
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};
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static const struct snd_malloc_ops *snd_dma_get_ops(struct snd_dma_buffer *dmab)
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{
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if (WARN_ON_ONCE(dmab->dev.type <= SNDRV_DMA_TYPE_UNKNOWN ||
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dmab->dev.type >= ARRAY_SIZE(dma_ops)))
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return NULL;
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return dma_ops[dmab->dev.type];
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}
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