path: root/include/linux/dma-map-ops.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * This header is for implementations of dma_map_ops and related code.
 * It should not be included in drivers just using the DMA API.
 */
#ifndef _LINUX_DMA_MAP_OPS_H
#define _LINUX_DMA_MAP_OPS_H

#include <linux/dma-mapping.h>
#include <linux/pgtable.h>

struct cma;

struct dma_map_ops {
	void *(*alloc)(struct device *dev, size_t size,
			dma_addr_t *dma_handle, gfp_t gfp,
			unsigned long attrs);
	void (*free)(struct device *dev, size_t size, void *vaddr,
			dma_addr_t dma_handle, unsigned long attrs);
	struct page *(*alloc_pages)(struct device *dev, size_t size,
			dma_addr_t *dma_handle, enum dma_data_direction dir,
			gfp_t gfp);
	void (*free_pages)(struct device *dev, size_t size, struct page *vaddr,
			dma_addr_t dma_handle, enum dma_data_direction dir);
	void *(*alloc_noncoherent)(struct device *dev, size_t size,
			dma_addr_t *dma_handle, enum dma_data_direction dir,
			gfp_t gfp);
	void (*free_noncoherent)(struct device *dev, size_t size, void *vaddr,
			dma_addr_t dma_handle, enum dma_data_direction dir);
	int (*mmap)(struct device *, struct vm_area_struct *,
			void *, dma_addr_t, size_t, unsigned long attrs);

	int (*get_sgtable)(struct device *dev, struct sg_table *sgt,
			void *cpu_addr, dma_addr_t dma_addr, size_t size,
			unsigned long attrs);

	dma_addr_t (*map_page)(struct device *dev, struct page *page,
			unsigned long offset, size_t size,
			enum dma_data_direction dir, unsigned long attrs);
	void (*unmap_page)(struct device *dev, dma_addr_t dma_handle,
			size_t size, enum dma_data_direction dir,
			unsigned long attrs);
	/*
	 * map_sg returns 0 on error and a value > 0 on success.
	 * It should never return a value < 0.
	 */
	int (*map_sg)(struct device *dev, struct scatterlist *sg, int nents,
			enum dma_data_direction dir, unsigned long attrs);
	void (*unmap_sg)(struct device *dev, struct scatterlist *sg, int nents,
			enum dma_data_direction dir, unsigned long attrs);
	dma_addr_t (*map_resource)(struct device *dev, phys_addr_t phys_addr,
			size_t size, enum dma_data_direction dir,
			unsigned long attrs);
	void (*unmap_resource)(struct device *dev, dma_addr_t dma_handle,
			size_t size, enum dma_data_direction dir,
			unsigned long attrs);
	void (*sync_single_for_cpu)(struct device *dev, dma_addr_t dma_handle,
			size_t size, enum dma_data_direction dir);
	void (*sync_single_for_device)(struct device *dev,
			dma_addr_t dma_handle, size_t size,
			enum dma_data_direction dir);
	void (*sync_sg_for_cpu)(struct device *dev, struct scatterlist *sg,
			int nents, enum dma_data_direction dir);
	void (*sync_sg_for_device)(struct device *dev, struct scatterlist *sg,
			int nents, enum dma_data_direction dir);
	void (*cache_sync)(struct device *dev, void *vaddr, size_t size,
			enum dma_data_direction direction);
	int (*dma_supported)(struct device *dev, u64 mask);
	u64 (*get_required_mask)(struct device *dev);
	size_t (*max_mapping_size)(struct device *dev);
	unsigned long (*get_merge_boundary)(struct device *dev);
};

#ifdef CONFIG_DMA_OPS
#include <asm/dma-mapping.h>

static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
	if (dev->dma_ops)
		return dev->dma_ops;
	return get_arch_dma_ops(dev->bus);
}

static inline void set_dma_ops(struct device *dev,
			       const struct dma_map_ops *dma_ops)
{
	dev->dma_ops = dma_ops;
}
#else /* CONFIG_DMA_OPS */
static inline const struct dma_map_ops *get_dma_ops(struct device *dev)
{
	return NULL;
}
static inline void set_dma_ops(struct device *dev,
			       const struct dma_map_ops *dma_ops)
{
}
#endif /* CONFIG_DMA_OPS */

#ifdef CONFIG_DMA_CMA
extern struct cma *dma_contiguous_default_area;

static inline struct cma *dev_get_cma_area(struct device *dev)
{
	if (dev && dev->cma_area)
		return dev->cma_area;
	return dma_contiguous_default_area;
}

void dma_contiguous_reserve(phys_addr_t addr_limit);
int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
		phys_addr_t limit, struct cma **res_cma, bool fixed);

struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
				       unsigned int order, bool no_warn);
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
				 int count);
struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp);
void dma_free_contiguous(struct device *dev, struct page *page, size_t size);

void dma_contiguous_early_fixup(phys_addr_t base, unsigned long size);
#else /* CONFIG_DMA_CMA */
static inline struct cma *dev_get_cma_area(struct device *dev)
{
	return NULL;
}
static inline void dma_contiguous_reserve(phys_addr_t limit)
{
}
static inline int dma_contiguous_reserve_area(phys_addr_t size,
		phys_addr_t base, phys_addr_t limit, struct cma **res_cma,
		bool fixed)
{
	return -ENOSYS;
}
static inline struct page *dma_alloc_from_contiguous(struct device *dev,
		size_t count, unsigned int order, bool no_warn)
{
	return NULL;
}
static inline bool dma_release_from_contiguous(struct device *dev,
		struct page *pages, int count)
{
	return false;
}
/* Use fallback alloc() and free() when CONFIG_DMA_CMA=n */
static inline struct page *dma_alloc_contiguous(struct device *dev, size_t size,
		gfp_t gfp)
{
	return NULL;
}
static inline void dma_free_contiguous(struct device *dev, struct page *page,
		size_t size)
{
	__free_pages(page, get_order(size));
}
#endif /* CONFIG_DMA_CMA*/

#ifdef CONFIG_DMA_PERNUMA_CMA
void dma_pernuma_cma_reserve(void);
#else
static inline void dma_pernuma_cma_reserve(void) { }
#endif /* CONFIG_DMA_PERNUMA_CMA */

#ifdef CONFIG_DMA_DECLARE_COHERENT
int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
		dma_addr_t device_addr, size_t size);
int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size,
		dma_addr_t *dma_handle, void **ret);
int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr);
int dma_mmap_from_dev_coherent(struct device *dev, struct vm_area_struct *vma,
		void *cpu_addr, size_t size, int *ret);

void *dma_alloc_from_global_coherent(struct device *dev, ssize_t size,
		dma_addr_t *dma_handle);
int dma_release_from_global_coherent(int order, void *vaddr);
int dma_mmap_from_global_coherent(struct vm_area_struct *vma, void *cpu_addr,
		size_t size, int *ret);

#else
static inline int dma_declare_coherent_memory(struct device *dev,
		phys_addr_t phys_addr, dma_addr_t device_addr, size_t size)
{
	return -ENOSYS;