/* * 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, 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); struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); void put_iova_domain(struct iova_domain *iovad); #endif