Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame^] | 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, |
| 54 | unsigned long limit_pfn); |
| 55 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 56 | unsigned long pfn_hi); |
| 57 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); |
| 58 | void init_iova_domain(struct iova_domain *iovad); |
| 59 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
| 60 | void put_iova_domain(struct iova_domain *iovad); |
| 61 | |
| 62 | #endif |