/* *  Copyright (c) by Jaroslav Kysela <perex@perex.cz> *                   Takashi Iwai <tiwai@suse.de> *  *  Generic memory allocators * * *   This program is free software; you can redistribute it and/or modify *   it under the terms of the GNU General Public License as published by *   the Free Software Foundation; either version 2 of the License, or *   (at your option) any later version. * *   This program is distributed in the hope that it will be useful, *   but WITHOUT ANY WARRANTY; without even the implied warranty of *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *   GNU General Public License for more details. * *   You should have received a copy of the GNU General Public License *   along with this program; if not, write to the Free Software *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA * */ #include <linux/slab.h>#include <linux/mm.h>#include <linux/dma-mapping.h>#include <linux/genalloc.h>#include <sound/memalloc.h> /* * *  Generic memory allocators * */ /** * snd_malloc_pages - allocate pages with the given size * @size: the size to allocate in bytes * @gfp_flags: the allocation conditions, GFP_XXX * * Allocates the physically contiguous pages with the given size. * * Return: The pointer of the buffer, or %NULL if no enough memory. */void *snd_malloc_pages(size_t size, gfp_t gfp_flags){	int pg; 	if (WARN_ON(!size))		return NULL;	if (WARN_ON(!gfp_flags))		return NULL;	gfp_flags |= __GFP_COMP;	/* compound page lets parts be mapped */	pg = get_order(size);	return (void *) __get_free_pages(gfp_flags, pg);}EXPORT_SYMBOL(snd_malloc_pages); /** * snd_free_pages - release the pages * @ptr: the buffer pointer to release * @size: the allocated buffer size * * Releases the buffer allocated via snd_malloc_pages(). */void snd_free_pages(void *ptr, size_t size){	int pg; 	if (ptr == NULL)		return;	pg = get_order(size);	free_pages((unsigned long) ptr, pg);}EXPORT_SYMBOL(snd_free_pages); /* * *  Bus-specific memory allocators * */ #ifdef CONFIG_HAS_DMA/* allocate the coherent DMA pages */static void *snd_malloc_dev_pages(struct device *dev, size_t size, dma_addr_t *dma){	int pg;	gfp_t gfp_flags; 	if (WARN_ON(!dma))		return NULL;	pg = get_order(size);	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 */	return dma_alloc_coherent(dev, PAGE_SIZE << pg, dma, gfp_flags);} /* free the coherent DMA pages */static void snd_free_dev_pages(struct device *dev, size_t size, void *ptr,			       dma_addr_t dma){	int pg; 	if (ptr == NULL)		return;	pg = get_order(size);	dma_free_coherent(dev, PAGE_SIZE << pg, ptr, dma);} #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(pool, size, &dmab->addr);} /** * 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 * */  /** * 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){	if (WARN_ON(!size))		return -ENXIO;	if (WARN_ON(!dmab))		return -ENXIO; 	dmab->dev.type = type;	dmab->dev.dev = device;	dmab->bytes = 0;	switch (type) {	case SNDRV_DMA_TYPE_CONTINUOUS:		dmab->area = snd_malloc_pages(size,					(__force gfp_t)(unsigned long)device);		dmab->addr = 0;		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;#endif /* CONFIG_GENERIC_ALLOCATOR */	case SNDRV_DMA_TYPE_DEV:		dmab->area = snd_malloc_dev_pages(device, size, &dmab->addr);		break;#endif#ifdef CONFIG_SND_DMA_SGBUF	case SNDRV_DMA_TYPE_DEV_SG:		snd_malloc_sgbuf_pages(device, size, dmab, NULL);		break;#endif	default:		pr_err("snd-malloc: invalid device type %d\n", type);		dmab->area = NULL;		dmab->addr = 0;		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) {		size_t aligned_size;		if (err != -ENOMEM)			return err;		if (size <= PAGE_SIZE)			return -ENOMEM;		aligned_size = PAGE_SIZE << get_order(size);		if (size != aligned_size)			size = aligned_size;		else			size >>= 1;	}	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:		snd_free_pages(dmab->area, dmab->bytes);		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:		snd_free_dev_pages(dmab->dev.dev, dmab->bytes, dmab->area, dmab->addr);		break;#endif#ifdef CONFIG_SND_DMA_SGBUF	case SNDRV_DMA_TYPE_DEV_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);