[linux-2.6-block.git] / include / linux / dma-iommu.h

/*
 * Copyright (C) 2014-2015 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef __DMA_IOMMU_H
#define __DMA_IOMMU_H

#ifdef __KERNEL__
#include <asm/errno.h>

#ifdef CONFIG_IOMMU_DMA
#include <linux/iommu.h>

int iommu_dma_init(void);

/* Domain management interface for IOMMU drivers */
int iommu_get_dma_cookie(struct iommu_domain *domain);
void iommu_put_dma_cookie(struct iommu_domain *domain);

/* Setup call for arch DMA mapping code */
int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);

/* General helpers for DMA-API <-> IOMMU-API interaction */
int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);

/*
 * These implement the bulk of the relevant DMA mapping callbacks, but require
 * the arch code to take care of attributes and cache maintenance
 */
struct page **iommu_dma_alloc(struct device *dev, size_t size, gfp_t gfp,
		unsigned long attrs, int prot, dma_addr_t *handle,
		void (*flush_page)(struct device *, const void *, phys_addr_t));
void iommu_dma_free(struct device *dev, struct page **pages, size_t size,
		dma_addr_t *handle);

int iommu_dma_mmap(struct page **pages, size_t size, struct vm_area_struct *vma);

dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
		unsigned long offset, size_t size, int prot);
int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg,
		int nents, int prot);

/*
 * Arch code with no special attribute handling may use these
 * directly as DMA mapping callbacks for simplicity
 */
void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
		enum dma_data_direction dir, unsigned long attrs);
void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents,
		enum dma_data_direction dir, unsigned long attrs);
int iommu_dma_supported(struct device *dev, u64 mask);
int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);

#else

struct iommu_domain;

static inline int iommu_dma_init(void)
{
	return 0;
}

static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
{
	return -ENODEV;
}

static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
{
}

#endif	/* CONFIG_IOMMU_DMA */
#endif	/* __KERNEL__ */
#endif	/* __DMA_IOMMU_H */
Commit	Line	Data
0db2e5d1 RM	1	/*
	2	* Copyright (C) 2014-2015 ARM Ltd.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	15	*/
	16	#ifndef __DMA_IOMMU_H
	17	#define __DMA_IOMMU_H
	18
	19	#ifdef __KERNEL__
	20	#include <asm/errno.h>
	21
	22	#ifdef CONFIG_IOMMU_DMA
	23	#include <linux/iommu.h>
	24
	25	int iommu_dma_init(void);
	26
	27	/* Domain management interface for IOMMU drivers */
	28	int iommu_get_dma_cookie(struct iommu_domain *domain);
	29	void iommu_put_dma_cookie(struct iommu_domain *domain);
	30
	31	/* Setup call for arch DMA mapping code */
	32	int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, u64 size);
	33
	34	/* General helpers for DMA-API <-> IOMMU-API interaction */
	35	int dma_direction_to_prot(enum dma_data_direction dir, bool coherent);
	36
	37	/*
	38	* These implement the bulk of the relevant DMA mapping callbacks, but require
	39	* the arch code to take care of attributes and cache maintenance
	40	*/
3b6b7e19	41	struct page *iommu_dma_alloc(struct device dev, size_t size, gfp_t gfp,
00085f1e	42	unsigned long attrs, int prot, dma_addr_t *handle,
0db2e5d1 RM	43	void (flush_page)(struct device , const void *, phys_addr_t));
	44	void iommu_dma_free(struct device dev, struct page *pages, size_t size,
	45	dma_addr_t *handle);
	46
	47	int iommu_dma_mmap(struct page *pages, size_t size, struct vm_area_struct vma);
	48
	49	dma_addr_t iommu_dma_map_page(struct device dev, struct page page,
	50	unsigned long offset, size_t size, int prot);
	51	int iommu_dma_map_sg(struct device dev, struct scatterlist sg,
	52	int nents, int prot);
	53
	54	/*
	55	* Arch code with no special attribute handling may use these
	56	* directly as DMA mapping callbacks for simplicity
	57	*/
	58	void iommu_dma_unmap_page(struct device *dev, dma_addr_t handle, size_t size,
00085f1e	59	enum dma_data_direction dir, unsigned long attrs);
0db2e5d1	60	void iommu_dma_unmap_sg(struct device dev, struct scatterlist sg, int nents,
00085f1e	61	enum dma_data_direction dir, unsigned long attrs);
0db2e5d1 RM	62	int iommu_dma_supported(struct device *dev, u64 mask);
	63	int iommu_dma_mapping_error(struct device *dev, dma_addr_t dma_addr);
	64
	65	#else
	66
	67	struct iommu_domain;
	68
	69	static inline int iommu_dma_init(void)
	70	{
	71	return 0;
	72	}
	73
	74	static inline int iommu_get_dma_cookie(struct iommu_domain *domain)
	75	{
	76	return -ENODEV;
	77	}
	78
	79	static inline void iommu_put_dma_cookie(struct iommu_domain *domain)
	80	{
	81	}
	82
	83	#endif /* CONFIG_IOMMU_DMA */
	84	#endif /* __KERNEL__ */
	85	#endif /* __DMA_IOMMU_H */