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| author | Robin Murphy <robin.murphy@arm.com> | 2015-01-12 17:51:15 +0000 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2015-01-19 14:55:22 +0100 |
| commit | 1b72250076dde4276acecf3a7da722b185703e78 (patch) | |
| tree | 86711d7e91dfb6ad914c23a18e8a12f5f30169ee /include/linux/iova.h | |
| parent | 85b4545629663486b7f71047ce3b54fa0ad3eb28 (diff) | |
| download | lwn-1b72250076dde4276acecf3a7da722b185703e78.tar.gz lwn-1b72250076dde4276acecf3a7da722b185703e78.zip | |
iommu: Make IOVA domain low limit flexible
To share the IOVA allocator with other architectures, it needs to
accommodate more general aperture restrictions; move the lower limit
from a compile-time constant to a runtime domain property to allow
IOVA domains with different requirements to co-exist.
Also reword the slightly unclear description of alloc_iova since we're
touching it anyway.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include/linux/iova.h')
| -rw-r--r-- | include/linux/iova.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/include/linux/iova.h b/include/linux/iova.h index ad0507c61cc7..591b19626b46 100644 --- a/include/linux/iova.h +++ b/include/linux/iova.h @@ -16,9 +16,6 @@ #include <linux/rbtree.h> #include <linux/dma-mapping.h> -/* IO virtual address start page frame number */ -#define IOVA_START_PFN (1) - /* iova structure */ struct iova { struct rb_node node; @@ -31,6 +28,7 @@ struct iova_domain { 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 */ + unsigned long start_pfn; /* Lower limit for this domain */ unsigned long dma_32bit_pfn; }; @@ -52,7 +50,8 @@ struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size, 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, unsigned long pfn_32bit); +void init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn, + unsigned long pfn_32bit); struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn); void put_iova_domain(struct iova_domain *iovad); struct iova *split_and_remove_iova(struct iova_domain *iovad, |