[mirror_ubuntu-bionic-kernel.git] / include / linux / iova.h

/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * This file is released under the GPLv2.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *
 */

#ifndef _IOVA_H_
#define _IOVA_H_

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/rbtree.h>
#include <linux/dma-mapping.h>

/* IO virtual address start page frame number */
#define IOVA_START_PFN		(1)

/* iova structure */
struct iova {
	struct rb_node	node;
	unsigned long	pfn_hi; /* IOMMU dish out addr hi */
	unsigned long	pfn_lo; /* IOMMU dish out addr lo */
};

/* holds all the iova translations for a domain */
struct iova_domain {
	spinlock_t	iova_rbtree_lock; /* Lock to protect update of rbtree */
	struct rb_root	rbroot;		/* iova domain rbtree root */
	struct rb_node	*cached32_node; /* Save last alloced node */
	unsigned long	dma_32bit_pfn;
};

struct iova *alloc_iova_mem(void);
void free_iova_mem(struct iova *iova);
void free_iova(struct iova_domain *iovad, unsigned long pfn);
void __free_iova(struct iova_domain *iovad, struct iova *iova);
struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
	unsigned long limit_pfn,
	bool size_aligned);
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
	unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);
struct iova *split_and_remove_iova(struct iova_domain *iovad,
	struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);

#endif
Commit	Line	Data
f8de50eb KA	1	/*
	2	* Copyright (c) 2006, Intel Corporation.
	3	*
	4	* This file is released under the GPLv2.
	5	*
98bcef56	6	* Copyright (C) 2006-2008 Intel Corporation
98bcef56	7	* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
f8de50eb KA	8	*
	9	*/
	10
	11	#ifndef _IOVA_H_
	12	#define _IOVA_H_
	13
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
	16	#include <linux/rbtree.h>
	17	#include <linux/dma-mapping.h>
	18
f8de50eb KA	19	/* IO virtual address start page frame number */
	20	#define IOVA_START_PFN (1)
	21
f8de50eb KA	22	/* iova structure */
	23	struct iova {
	24	struct rb_node node;
	25	unsigned long pfn_hi; /* IOMMU dish out addr hi */
	26	unsigned long pfn_lo; /* IOMMU dish out addr lo */
	27	};
	28
	29	/* holds all the iova translations for a domain */
	30	struct iova_domain {
f8de50eb KA	31	spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
	32	struct rb_root rbroot; /* iova domain rbtree root */
	33	struct rb_node cached32_node; / Save last alloced node */
f661197e	34	unsigned long dma_32bit_pfn;
f8de50eb KA	35	};
	36
	37	struct iova *alloc_iova_mem(void);
	38	void free_iova_mem(struct iova *iova);
	39	void free_iova(struct iova_domain *iovad, unsigned long pfn);
	40	void __free_iova(struct iova_domain iovad, struct iova iova);
	41	struct iova alloc_iova(struct iova_domain iovad, unsigned long size,
f76aec76 KA	42	unsigned long limit_pfn,
f76aec76 KA	43	bool size_aligned);
f8de50eb KA	44	struct iova reserve_iova(struct iova_domain iovad, unsigned long pfn_lo,
	45	unsigned long pfn_hi);
	46	void copy_reserved_iova(struct iova_domain from, struct iova_domain to);
f661197e	47	void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
f8de50eb KA	48	struct iova find_iova(struct iova_domain iovad, unsigned long pfn);
f8de50eb KA	49	void put_iova_domain(struct iova_domain *iovad);
75f05569 JL	50	struct iova split_and_remove_iova(struct iova_domain iovad,
75f05569 JL	51	struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
f8de50eb KA	52
f8de50eb KA	53	#endif