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 | |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 18 | /* IO virtual address start page frame number */ |
| 19 | #define IOVA_START_PFN (1) |
| 20 | |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 21 | /* iova structure */ |
| 22 | struct iova { |
| 23 | struct rb_node node; |
| 24 | unsigned long pfn_hi; /* IOMMU dish out addr hi */ |
| 25 | unsigned long pfn_lo; /* IOMMU dish out addr lo */ |
| 26 | }; |
| 27 | |
| 28 | /* holds all the iova translations for a domain */ |
| 29 | struct iova_domain { |
| 30 | spinlock_t iova_alloc_lock;/* Lock to protect iova allocation */ |
| 31 | spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */ |
| 32 | struct rb_root rbroot; /* iova domain rbtree root */ |
| 33 | struct rb_node *cached32_node; /* Save last alloced node */ |
David Miller | f661197 | 2008-02-06 01:36:23 -0800 | [diff] [blame^] | 34 | unsigned long dma_32bit_pfn; |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 35 | }; |
| 36 | |
| 37 | struct iova *alloc_iova_mem(void); |
| 38 | void free_iova_mem(struct iova *iova); |
| 39 | void free_iova(struct iova_domain *iovad, unsigned long pfn); |
| 40 | void __free_iova(struct iova_domain *iovad, struct iova *iova); |
| 41 | struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, |
Keshavamurthy, Anil S | f76aec7 | 2007-10-21 16:41:58 -0700 | [diff] [blame] | 42 | unsigned long limit_pfn, |
| 43 | bool size_aligned); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 44 | struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo, |
| 45 | unsigned long pfn_hi); |
| 46 | void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to); |
David Miller | f661197 | 2008-02-06 01:36:23 -0800 | [diff] [blame^] | 47 | void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit); |
Keshavamurthy, Anil S | f8de50e | 2007-10-21 16:41:48 -0700 | [diff] [blame] | 48 | struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); |
| 49 | void put_iova_domain(struct iova_domain *iovad); |
| 50 | |
| 51 | #endif |