projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| f8de50eb KA |
1 | /* |
| 2 | * Copyright (c) 2006, Intel Corporation. | |
| 3 | * | |
| 4 | * This file is released under the GPLv2. | |
| 5 | * | |
| 6 | * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> | |
| 7 | * | |
| 8 | */ | |
| 9 | ||
| 10 | #ifndef _IOVA_H_ | |
| 11 | #define _IOVA_H_ | |
| 12 | ||
| 13 | #include <linux/types.h> | |
| 14 | #include <linux/kernel.h> | |
| 15 | #include <linux/rbtree.h> | |
| 16 | #include <linux/dma-mapping.h> | |
| 17 | ||
| 18 | /* | |
| 19 | * We need a fixed PAGE_SIZE of 4K irrespective of | |
| 20 | * arch PAGE_SIZE for IOMMU page tables. | |
| 21 | */ | |
| 22 | #define PAGE_SHIFT_4K (12) | |
| 23 | #define PAGE_SIZE_4K (1UL << PAGE_SHIFT_4K) | |
| 24 | #define PAGE_MASK_4K (((u64)-1) << PAGE_SHIFT_4K) | |
| 25 | #define PAGE_ALIGN_4K(addr) (((addr) + PAGE_SIZE_4K - 1) & PAGE_MASK_4K) | |
| 26 | ||
| 27 | /* IO virtual address start page frame number */ | |
| 28 | #define IOVA_START_PFN (1) | |
| 29 | ||
| 30 | #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT_4K) | |
| 31 | #define DMA_32BIT_PFN IOVA_PFN(DMA_32BIT_MASK) | |
| 32 | #define DMA_64BIT_PFN IOVA_PFN(DMA_64BIT_MASK) | |
| 33 | ||
| 34 | /* iova structure */ | |
| 35 | struct iova { | |
| 36 | struct rb_node node; | |
| 37 | unsigned long pfn_hi; /* IOMMU dish out addr hi */ | |
| 38 | unsigned long pfn_lo; /* IOMMU dish out addr lo */ | |
| 39 | }; | |
| 40 | ||
| 41 | /* holds all the iova translations for a domain */ | |
| 42 | struct iova_domain { | |
| 43 | spinlock_t iova_alloc_lock;/* Lock to protect iova allocation */ | |
| 44 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ | |
| 45 | struct rb_root rbroot; /* iova domain rbtree root */ | |
| 46 | struct rb_node *cached32_node; /* Save last alloced node */ | |
| 47 | }; | |
| 48 | ||
| 49 | struct iova *alloc_iova_mem(void); | |
| 50 | void free_iova_mem(struct iova *iova); | |
| 51 | void free_iova(struct iova_domain *iovad, unsigned long pfn); | |
| 52 | void __free_iova(struct iova_domain *iovad, struct iova *iova); | |
| 53 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, | |
| f76aec76 KA |
54 | unsigned long limit_pfn, |
| 55 | bool size_aligned); | |
| f8de50eb KA |
56 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 57 | unsigned long pfn_hi); | |
| 58 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); | |
| 59 | void init_iova_domain(struct iova_domain *iovad); | |
| 60 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); | |
| 61 | void put_iova_domain(struct iova_domain *iovad); | |
| 62 | ||
| 63 | #endif |