linux/include/linux/iova.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Author: Anil S Keshavamurthy <[email protected]>
 */

#ifndef _IOVA_H_
#define _IOVA_H_

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

/* iova structure */
struct iova { … };


struct iova_rcache;

/* holds all the iova translations for a domain */
struct iova_domain { … };

static inline unsigned long iova_size(struct iova *iova)
{ … }

static inline unsigned long iova_shift(struct iova_domain *iovad)
{ … }

static inline unsigned long iova_mask(struct iova_domain *iovad)
{ … }

static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
{ … }

static inline size_t iova_align(struct iova_domain *iovad, size_t size)
{ … }

static inline size_t iova_align_down(struct iova_domain *iovad, size_t size)
{ … }

static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
{ … }

static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
{ … }

#if IS_REACHABLE(CONFIG_IOMMU_IOVA)
int iova_cache_get(void);
void iova_cache_put(void);

unsigned long iova_rcache_range(void);

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);
void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
		    unsigned long size);
unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
			      unsigned long limit_pfn, bool flush_rcache);
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
	unsigned long pfn_hi);
void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
	unsigned long start_pfn);
int iova_domain_init_rcaches(struct iova_domain *iovad);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);
#else
static inline int iova_cache_get(void)
{
	return -ENOTSUPP;
}

static inline void iova_cache_put(void)
{
}

static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
{
}

static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
{
}

static inline struct iova *alloc_iova(struct iova_domain *iovad,
				      unsigned long size,
				      unsigned long limit_pfn,
				      bool size_aligned)
{
	return NULL;
}

static inline void free_iova_fast(struct iova_domain *iovad,
				  unsigned long pfn,
				  unsigned long size)
{
}

static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
					    unsigned long size,
					    unsigned long limit_pfn,
					    bool flush_rcache)
{
	return 0;
}

static inline struct iova *reserve_iova(struct iova_domain *iovad,
					unsigned long pfn_lo,
					unsigned long pfn_hi)
{
	return NULL;
}

static inline void init_iova_domain(struct iova_domain *iovad,
				    unsigned long granule,
				    unsigned long start_pfn)
{
}

static inline struct iova *find_iova(struct iova_domain *iovad,
				     unsigned long pfn)
{
	return NULL;
}

static inline void put_iova_domain(struct iova_domain *iovad)
{
}

#endif

#endif