256 строки
6.5 KiB
C
256 строки
6.5 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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/*
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*
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* Bus-specific memory allocators
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*
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*/
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#ifdef CONFIG_HAS_DMA
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/* allocate the coherent DMA pages */
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static void snd_malloc_dev_pages(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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}
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/* free the coherent DMA pages */
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static void snd_free_dev_pages(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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#ifdef CONFIG_GENERIC_ALLOCATOR
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/**
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* snd_malloc_dev_iram - allocate memory from on-chip internal ram
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* @dmab: buffer allocation record to store the allocated data
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* @size: number of bytes to allocate from the iram
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*
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* This function requires iram phandle provided via of_node
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*/
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static void snd_malloc_dev_iram(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 = NULL;
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dmab->area = NULL;
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dmab->addr = 0;
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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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if (!pool)
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return;
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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(pool, size, &dmab->addr);
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}
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/**
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* snd_free_dev_iram - free allocated specific memory from on-chip internal ram
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* @dmab: buffer allocation record to store the allocated data
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*/
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static void snd_free_dev_iram(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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#endif /* CONFIG_GENERIC_ALLOCATOR */
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#endif /* CONFIG_HAS_DMA */
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/*
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*
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* ALSA generic memory management
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*
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*/
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static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,
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gfp_t default_gfp)
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{
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if (!dev)
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return default_gfp;
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else
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return (__force gfp_t)(unsigned long)dev;
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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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gfp_t gfp;
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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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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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switch (type) {
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case SNDRV_DMA_TYPE_CONTINUOUS:
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gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);
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dmab->area = alloc_pages_exact(size, gfp);
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break;
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case SNDRV_DMA_TYPE_VMALLOC:
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gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);
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dmab->area = __vmalloc(size, gfp);
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break;
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#ifdef CONFIG_HAS_DMA
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#ifdef CONFIG_GENERIC_ALLOCATOR
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case SNDRV_DMA_TYPE_DEV_IRAM:
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snd_malloc_dev_iram(dmab, size);
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if (dmab->area)
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break;
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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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#endif /* CONFIG_GENERIC_ALLOCATOR */
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fallthrough;
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case SNDRV_DMA_TYPE_DEV:
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case SNDRV_DMA_TYPE_DEV_UC:
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snd_malloc_dev_pages(dmab, size);
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break;
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#endif
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#ifdef CONFIG_SND_DMA_SGBUF
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case SNDRV_DMA_TYPE_DEV_SG:
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case SNDRV_DMA_TYPE_DEV_UC_SG:
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snd_malloc_sgbuf_pages(device, size, dmab, NULL);
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break;
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#endif
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default:
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pr_err("snd-malloc: invalid device type %d\n", type);
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return -ENXIO;
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}
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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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switch (dmab->dev.type) {
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case SNDRV_DMA_TYPE_CONTINUOUS:
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free_pages_exact(dmab->area, dmab->bytes);
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break;
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case SNDRV_DMA_TYPE_VMALLOC:
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vfree(dmab->area);
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break;
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#ifdef CONFIG_HAS_DMA
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#ifdef CONFIG_GENERIC_ALLOCATOR
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case SNDRV_DMA_TYPE_DEV_IRAM:
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snd_free_dev_iram(dmab);
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break;
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#endif /* CONFIG_GENERIC_ALLOCATOR */
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case SNDRV_DMA_TYPE_DEV:
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case SNDRV_DMA_TYPE_DEV_UC:
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snd_free_dev_pages(dmab);
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break;
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#endif
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#ifdef CONFIG_SND_DMA_SGBUF
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case SNDRV_DMA_TYPE_DEV_SG:
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case SNDRV_DMA_TYPE_DEV_UC_SG:
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snd_free_sgbuf_pages(dmab);
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break;
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#endif
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default:
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pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);
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}
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}
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EXPORT_SYMBOL(snd_dma_free_pages);
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