63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2006, Intel Corporation.
|
||
|
|
*
|
||
|
|
* This file is released under the GPLv2.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2006 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>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We need a fixed PAGE_SIZE of 4K irrespective of
|
||
|
|
* arch PAGE_SIZE for IOMMU page tables.
|
||
|
|
*/
|
||
|
|
#define PAGE_SHIFT_4K (12)
|
||
|
|
#define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K)
|
||
|
|
#define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K)
|
||
|
|
#define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K)
|
||
|
|
|
||
|
|
/* IO virtual address start page frame number */
|
||
|
|
#define IOVA_START_PFN (1)
|
||
|
|
|
||
|
|
#define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K)
|
||
|
|
#define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK)
|
||
|
|
#define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK)
|
||
|
|
|
||
|
|
/* 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_alloc_lock;/* Lock to protect iova allocation */
|
||
|
|
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 */
|
||
|
|
};
|
||
|
|
|
||
|
|
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);
|
||
|
|
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);
|
||
|
|
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
|
||
|
|
void put_iova_domain(struct iova_domain *iovad);
|
||
|
|
|
||
|
|
#endif
|