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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 /drivers/iommu/iova.c | |
| parent | 85b4545629663486b7f71047ce3b54fa0ad3eb28 (diff) | |
| download | linux-stable-1b72250076dde4276acecf3a7da722b185703e78.tar.gz linux-stable-1b72250076dde4276acecf3a7da722b185703e78.tar.bz2 linux-stable-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 'drivers/iommu/iova.c')
| -rw-r--r-- | drivers/iommu/iova.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index 520b8c8ae0c4..a3dbba8caa19 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -55,11 +55,13 @@ void free_iova_mem(struct iova *iova) } void -init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit) +init_iova_domain(struct iova_domain *iovad, unsigned long start_pfn, + unsigned long pfn_32bit) { spin_lock_init(&iovad->iova_rbtree_lock); iovad->rbroot = RB_ROOT; iovad->cached32_node = NULL; + iovad->start_pfn = start_pfn; iovad->dma_32bit_pfn = pfn_32bit; } @@ -162,7 +164,7 @@ move_left: if (!curr) { if (size_aligned) pad_size = iova_get_pad_size(size, limit_pfn); - if ((IOVA_START_PFN + size + pad_size) > limit_pfn) { + if ((iovad->start_pfn + size + pad_size) > limit_pfn) { spin_unlock_irqrestore(&iovad->iova_rbtree_lock, flags); return -ENOMEM; } @@ -237,8 +239,8 @@ iova_insert_rbtree(struct rb_root *root, struct iova *iova) * @size: - size of page frames to allocate * @limit_pfn: - max limit address * @size_aligned: - set if size_aligned address range is required - * This function allocates an iova in the range limit_pfn to IOVA_START_PFN - * looking from limit_pfn instead from IOVA_START_PFN. If the size_aligned + * This function allocates an iova in the range iovad->start_pfn to limit_pfn, + * searching top-down from limit_pfn to iovad->start_pfn. If the size_aligned * flag is set then the allocated address iova->pfn_lo will be naturally * aligned on roundup_power_of_two(size). */ |