iova.h File Reference

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

Go to the source code of this file.

Data Structures
struct	iova
struct	iova_domain

Macros
#define	IOVA_START_PFN   (1)

Functions
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)

Macro Definition Documentation

#define IOVA_START_PFN   (1)

Definition at line 20 of file iova.h.

Function Documentation

void __free_iova	(	struct iova_domain *	iovad,
		struct iova *	iova
	)

__free_iova - frees the given iova : iova domain in question. : iova in question. Frees the given iova belonging to the giving domain

Definition at line 286 of file iova.c.

struct iova* alloc_iova ( struct iova_domain *  iovad, unsigned long  size, unsigned long  limit_pfn, bool  size_aligned  )

read

alloc_iova - allocates an iova : - iova domain in question : - size of page frames to allocate : - max limit address : - set if size_aligned address range is required This function allocates an iova in the range limit_pfn to IOVA_START_PFN looking from limit_pfn instead from IOVA_START_PFN. If the size_aligned flag is set then the allocated address iova->pfn_lo will be naturally aligned on roundup_power_of_two(size).

Definition at line 211 of file iova.c.

struct iova* alloc_iova_mem ( void  )

read

Definition at line 528 of file intel-iommu.c.

void copy_reserved_iova	(	struct iova_domain *	from,
		struct iova_domain *	to
	)

copy_reserved_iova - copies the reserved between domains : - source doamin from where to copy : - destination domin where to copy This function copies reserved iova's from one doamin to other.

Definition at line 420 of file iova.c.

struct iova* find_iova ( struct iova_domain *  iovad, unsigned long  pfn  )

read

find_iova - find's an iova for a given pfn : - iova domain in question. : - page frame number This function finds and returns an iova belonging to the given doamin which matches the given pfn.

Definition at line 246 of file iova.c.

void free_iova	(	struct iova_domain *	iovad,
		unsigned long	pfn
	)

free_iova - finds and frees the iova for a given pfn : - iova domain in question. : - pfn that is allocated previously This functions finds an iova for a given pfn and then frees the iova from that domain.

Definition at line 305 of file iova.c.

void free_iova_mem

(

struct iova *

iova

)

Definition at line 533 of file intel-iommu.c.

void init_iova_domain	(	struct iova_domain *	iovad,
		unsigned long	pfn_32bit
	)

Definition at line 23 of file iova.c.

void put_iova_domain

(

struct iova_domain *

iovad

)

put_iova_domain - destroys the iova doamin : - iova domain in question. All the iova's in that domain are destroyed.

Definition at line 318 of file iova.c.

struct iova* reserve_iova ( struct iova_domain *  iovad, unsigned long  pfn_lo, unsigned long  pfn_hi  )

read

reserve_iova - reserves an iova in the given range : - iova domain pointer : - lower page frame address :- higher pfn adderss This function allocates reserves the address range from pfn_lo to pfn_hi so that this address is not dished out as part of alloc_iova.

Definition at line 380 of file iova.c.