// SPDX-License-Identifier: GPL-2.0-or-later/* *  Copyright (c) by Jaroslav Kysela <perex@perex.cz> *                   Takashi Iwai <tiwai@suse.de> *  *  Generic memory allocators */ #include <linux/slab.h>#include <linux/mm.h>#include <linux/dma-mapping.h>#include <linux/genalloc.h>#include <linux/vmalloc.h>#ifdef CONFIG_X86#include <asm/set_memory.h>#endif#include <sound/memalloc.h> /* * *  Bus-specific memory allocators * */ #ifdef CONFIG_HAS_DMA/* allocate the coherent DMA pages */static void snd_malloc_dev_pages(struct snd_dma_buffer *dmab, size_t size){	gfp_t gfp_flags; 	gfp_flags = GFP_KERNEL		| __GFP_COMP	/* compound page lets parts be mapped */		| __GFP_NORETRY /* don't trigger OOM-killer */		| __GFP_NOWARN; /* no stack trace print - this call is non-critical */	dmab->area = dma_alloc_coherent(dmab->dev.dev, size, &dmab->addr,					gfp_flags);#ifdef CONFIG_X86	if (dmab->area && dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)		set_memory_wc((unsigned long)dmab->area,			      PAGE_ALIGN(size) >> PAGE_SHIFT);#endif} /* free the coherent DMA pages */static void snd_free_dev_pages(struct snd_dma_buffer *dmab){#ifdef CONFIG_X86	if (dmab->dev.type == SNDRV_DMA_TYPE_DEV_UC)		set_memory_wb((unsigned long)dmab->area,			      PAGE_ALIGN(dmab->bytes) >> PAGE_SHIFT);#endif	dma_free_coherent(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);} #ifdef CONFIG_GENERIC_ALLOCATOR/** * snd_malloc_dev_iram - allocate memory from on-chip internal ram * @dmab: buffer allocation record to store the allocated data * @size: number of bytes to allocate from the iram * * This function requires iram phandle provided via of_node */static void snd_malloc_dev_iram(struct snd_dma_buffer *dmab, size_t size){	struct device *dev = dmab->dev.dev;	struct gen_pool *pool = NULL; 	dmab->area = NULL;	dmab->addr = 0; 	if (dev->of_node)		pool = of_gen_pool_get(dev->of_node, "iram", 0); 	if (!pool)		return; 	/* Assign the pool into private_data field */	dmab->private_data = pool; 	dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,					PAGE_SIZE);} /** * snd_free_dev_iram - free allocated specific memory from on-chip internal ram * @dmab: buffer allocation record to store the allocated data */static void snd_free_dev_iram(struct snd_dma_buffer *dmab){	struct gen_pool *pool = dmab->private_data; 	if (pool && dmab->area)		gen_pool_free(pool, (unsigned long)dmab->area, dmab->bytes);}#endif /* CONFIG_GENERIC_ALLOCATOR */#endif /* CONFIG_HAS_DMA */ /* * *  ALSA generic memory management * */ static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev,					  gfp_t default_gfp){	if (!dev)		return default_gfp;	else		return (__force gfp_t)(unsigned long)dev;} /** * snd_dma_alloc_pages - allocate the buffer area according to the given type * @type: the DMA buffer type * @device: the device pointer * @size: the buffer size to allocate * @dmab: buffer allocation record to store the allocated data * * Calls the memory-allocator function for the corresponding * buffer type. * * Return: Zero if the buffer with the given size is allocated successfully, * otherwise a negative value on error. */int snd_dma_alloc_pages(int type, struct device *device, size_t size,			struct snd_dma_buffer *dmab){	gfp_t gfp; 	if (WARN_ON(!size))		return -ENXIO;	if (WARN_ON(!dmab))		return -ENXIO; 	size = PAGE_ALIGN(size);	dmab->dev.type = type;	dmab->dev.dev = device;	dmab->bytes = 0;	dmab->area = NULL;	dmab->addr = 0;	dmab->private_data = NULL;	switch (type) {	case SNDRV_DMA_TYPE_CONTINUOUS:		gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL);		dmab->area = alloc_pages_exact(size, gfp);		break;	case SNDRV_DMA_TYPE_VMALLOC:		gfp = snd_mem_get_gfp_flags(device, GFP_KERNEL | __GFP_HIGHMEM);		dmab->area = __vmalloc(size, gfp);		break;#ifdef CONFIG_HAS_DMA#ifdef CONFIG_GENERIC_ALLOCATOR	case SNDRV_DMA_TYPE_DEV_IRAM:		snd_malloc_dev_iram(dmab, size);		if (dmab->area)			break;		/* Internal memory might have limited size and no enough space,		 * so if we fail to malloc, try to fetch memory traditionally.		 */		dmab->dev.type = SNDRV_DMA_TYPE_DEV;		fallthrough;#endif /* CONFIG_GENERIC_ALLOCATOR */	case SNDRV_DMA_TYPE_DEV:	case SNDRV_DMA_TYPE_DEV_UC:		snd_malloc_dev_pages(dmab, size);		break;#endif#ifdef CONFIG_SND_DMA_SGBUF	case SNDRV_DMA_TYPE_DEV_SG:	case SNDRV_DMA_TYPE_DEV_UC_SG:		snd_malloc_sgbuf_pages(device, size, dmab, NULL);		break;#endif	default:		pr_err("snd-malloc: invalid device type %d\n", type);		return -ENXIO;	}	if (! dmab->area)		return -ENOMEM;	dmab->bytes = size;	return 0;}EXPORT_SYMBOL(snd_dma_alloc_pages); /** * snd_dma_alloc_pages_fallback - allocate the buffer area according to the given type with fallback * @type: the DMA buffer type * @device: the device pointer * @size: the buffer size to allocate * @dmab: buffer allocation record to store the allocated data * * Calls the memory-allocator function for the corresponding * buffer type.  When no space is left, this function reduces the size and * tries to allocate again.  The size actually allocated is stored in * res_size argument. * * Return: Zero if the buffer with the given size is allocated successfully, * otherwise a negative value on error. */int snd_dma_alloc_pages_fallback(int type, struct device *device, size_t size,				 struct snd_dma_buffer *dmab){	int err; 	while ((err = snd_dma_alloc_pages(type, device, size, dmab)) < 0) {		if (err != -ENOMEM)			return err;		if (size <= PAGE_SIZE)			return -ENOMEM;		size >>= 1;		size = PAGE_SIZE << get_order(size);	}	if (! dmab->area)		return -ENOMEM;	return 0;}EXPORT_SYMBOL(snd_dma_alloc_pages_fallback);  /** * snd_dma_free_pages - release the allocated buffer * @dmab: the buffer allocation record to release * * Releases the allocated buffer via snd_dma_alloc_pages(). */void snd_dma_free_pages(struct snd_dma_buffer *dmab){	switch (dmab->dev.type) {	case SNDRV_DMA_TYPE_CONTINUOUS:		free_pages_exact(dmab->area, dmab->bytes);		break;	case SNDRV_DMA_TYPE_VMALLOC:		vfree(dmab->area);		break;#ifdef CONFIG_HAS_DMA#ifdef CONFIG_GENERIC_ALLOCATOR	case SNDRV_DMA_TYPE_DEV_IRAM:		snd_free_dev_iram(dmab);		break;#endif /* CONFIG_GENERIC_ALLOCATOR */	case SNDRV_DMA_TYPE_DEV:	case SNDRV_DMA_TYPE_DEV_UC:		snd_free_dev_pages(dmab);		break;#endif#ifdef CONFIG_SND_DMA_SGBUF	case SNDRV_DMA_TYPE_DEV_SG:	case SNDRV_DMA_TYPE_DEV_UC_SG:		snd_free_sgbuf_pages(dmab);		break;#endif	default:		pr_err("snd-malloc: invalid device type %d\n", dmab->dev.type);	}}EXPORT_SYMBOL(snd_dma_free_pages);