iommu/arm-smmu-v3: Change vmid alloc strategy from bitmap to ida

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For current implementation of vmid allocation of arm smmu-v3, a per-smmu
devide bitmap of 64K bits(8K bytes) is allocated on behalf of possible VMID
range, which is two pages for some architectures. Besides that, its memory
consumption is 'static', despite of how many VMIDs are allocated actually.

That's memory inefficient and lack of scalability.

So an IDA based implementation is introduced to address this issue, which
is capable of self-expanding on the actual need of VMID allocation.

Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/TYCP286MB2323E0C525FF9F94E3B07C7ACA35A@TYCP286MB2323.JPNP286.PROD.OUTLOOK.COM
Signed-off-by: Will Deacon <will@kernel.org>

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Dawei Li 2023-07-16 00:16:21 +08:00 • committed by Will Deacon

parent 6eaae19807

commit 1672730cff

2 changed files with 8 additions and 23 deletions

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29

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

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2

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h

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