/* * drivers/base/dma-mapping.c - arch-independent dma-mapping routines * * Copyright (c) 2006  SUSE Linux Products GmbH * Copyright (c) 2006  Tejun Heo <teheo@suse.de> * * This file is released under the GPLv2. */ #include <linux/dma-mapping.h>#include <linux/export.h>#include <linux/gfp.h> /* * Managed DMA API */struct dma_devres {	size_t		size;	void		*vaddr;	dma_addr_t	dma_handle;}; static void dmam_coherent_release(struct device *dev, void *res){	struct dma_devres *this = res; 	dma_free_coherent(dev, this->size, this->vaddr, this->dma_handle);} static void dmam_noncoherent_release(struct device *dev, void *res){	struct dma_devres *this = res; 	dma_free_noncoherent(dev, this->size, this->vaddr, this->dma_handle);} static int dmam_match(struct device *dev, void *res, void *match_data){	struct dma_devres *this = res, *match = match_data; 	if (this->vaddr == match->vaddr) {		WARN_ON(this->size != match->size ||			this->dma_handle != match->dma_handle);		return 1;	}	return 0;} /** * dmam_alloc_coherent - Managed dma_alloc_coherent() * @dev: Device to allocate coherent memory for * @size: Size of allocation * @dma_handle: Out argument for allocated DMA handle * @gfp: Allocation flags * * Managed dma_alloc_coherent().  Memory allocated using this function * will be automatically released on driver detach. * * RETURNS: * Pointer to allocated memory on success, NULL on failure. */void * dmam_alloc_coherent(struct device *dev, size_t size,			   dma_addr_t *dma_handle, gfp_t gfp){	struct dma_devres *dr;	void *vaddr; 	dr = devres_alloc(dmam_coherent_release, sizeof(*dr), gfp);	if (!dr)		return NULL; 	vaddr = dma_alloc_coherent(dev, size, dma_handle, gfp);	if (!vaddr) {		devres_free(dr);		return NULL;	} 	dr->vaddr = vaddr;	dr->dma_handle = *dma_handle;	dr->size = size; 	devres_add(dev, dr); 	return vaddr;}EXPORT_SYMBOL(dmam_alloc_coherent); /** * dmam_free_coherent - Managed dma_free_coherent() * @dev: Device to free coherent memory for * @size: Size of allocation * @vaddr: Virtual address of the memory to free * @dma_handle: DMA handle of the memory to free * * Managed dma_free_coherent(). */void dmam_free_coherent(struct device *dev, size_t size, void *vaddr,			dma_addr_t dma_handle){	struct dma_devres match_data = { size, vaddr, dma_handle }; 	dma_free_coherent(dev, size, vaddr, dma_handle);	WARN_ON(devres_destroy(dev, dmam_coherent_release, dmam_match,			       &match_data));}EXPORT_SYMBOL(dmam_free_coherent); /** * dmam_alloc_non_coherent - Managed dma_alloc_non_coherent() * @dev: Device to allocate non_coherent memory for * @size: Size of allocation * @dma_handle: Out argument for allocated DMA handle * @gfp: Allocation flags * * Managed dma_alloc_non_coherent().  Memory allocated using this * function will be automatically released on driver detach. * * RETURNS: * Pointer to allocated memory on success, NULL on failure. */void *dmam_alloc_noncoherent(struct device *dev, size_t size,			     dma_addr_t *dma_handle, gfp_t gfp){	struct dma_devres *dr;	void *vaddr; 	dr = devres_alloc(dmam_noncoherent_release, sizeof(*dr), gfp);	if (!dr)		return NULL; 	vaddr = dma_alloc_noncoherent(dev, size, dma_handle, gfp);	if (!vaddr) {		devres_free(dr);		return NULL;	} 	dr->vaddr = vaddr;	dr->dma_handle = *dma_handle;	dr->size = size; 	devres_add(dev, dr); 	return vaddr;}EXPORT_SYMBOL(dmam_alloc_noncoherent); /** * dmam_free_coherent - Managed dma_free_noncoherent() * @dev: Device to free noncoherent memory for * @size: Size of allocation * @vaddr: Virtual address of the memory to free * @dma_handle: DMA handle of the memory to free * * Managed dma_free_noncoherent(). */void dmam_free_noncoherent(struct device *dev, size_t size, void *vaddr,			   dma_addr_t dma_handle){	struct dma_devres match_data = { size, vaddr, dma_handle }; 	dma_free_noncoherent(dev, size, vaddr, dma_handle);	WARN_ON(!devres_destroy(dev, dmam_noncoherent_release, dmam_match,				&match_data));}EXPORT_SYMBOL(dmam_free_noncoherent); #ifdef ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY static void dmam_coherent_decl_release(struct device *dev, void *res){	dma_release_declared_memory(dev);} /** * dmam_declare_coherent_memory - Managed dma_declare_coherent_memory() * @dev: Device to declare coherent memory for * @bus_addr: Bus address of coherent memory to be declared * @device_addr: Device address of coherent memory to be declared * @size: Size of coherent memory to be declared * @flags: Flags * * Managed dma_declare_coherent_memory(). * * RETURNS: * 0 on success, -errno on failure. */int dmam_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,				 dma_addr_t device_addr, size_t size, int flags){	void *res;	int rc; 	res = devres_alloc(dmam_coherent_decl_release, 0, GFP_KERNEL);	if (!res)		return -ENOMEM; 	rc = dma_declare_coherent_memory(dev, bus_addr, device_addr, size,					 flags);	if (rc == 0)		devres_add(dev, res);	else		devres_free(res); 	return rc;}EXPORT_SYMBOL(dmam_declare_coherent_memory); /** * dmam_release_declared_memory - Managed dma_release_declared_memory(). * @dev: Device to release declared coherent memory for * * Managed dmam_release_declared_memory(). */void dmam_release_declared_memory(struct device *dev){	WARN_ON(devres_destroy(dev, dmam_coherent_decl_release, NULL, NULL));}EXPORT_SYMBOL(dmam_release_declared_memory); #endif