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SubjectRe: [PATCH v4 1/5] iommu/arm-smmu-v3: fix the implementation of flush_iotlb_all hook
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On 06/08/18 13:27, Zhen Lei wrote:
> .flush_iotlb_all can not just wait for previous tlbi operations to be
> completed, but should also invalid all TLBs of the related domain.

I think it was like that because the only caller in practice was
iommu_group_create_direct_mappings(), and at that point any relevant
invalidations would have already been issued anyway. Once
flush_iotlb_all actually does what it's supposed to we'll get a bit of
unavoidable over-invalidation on that path, but it's no big deal.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> ---
> drivers/iommu/arm-smmu-v3.c | 10 +++++++++-
> 1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index 4810f61..2f1304b 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -1770,6 +1770,14 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
> return ops->unmap(ops, iova, size);
> }
>
> +static void arm_smmu_flush_iotlb_all(struct iommu_domain *domain)
> +{
> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
> +
> + if (smmu_domain->smmu)
> + arm_smmu_tlb_inv_context(smmu_domain);
> +}
> +
> static void arm_smmu_iotlb_sync(struct iommu_domain *domain)
> {
> struct arm_smmu_device *smmu = to_smmu_domain(domain)->smmu;
> @@ -1998,7 +2006,7 @@ static void arm_smmu_put_resv_regions(struct device *dev,
> .map = arm_smmu_map,
> .unmap = arm_smmu_unmap,
> .map_sg = default_iommu_map_sg,
> - .flush_iotlb_all = arm_smmu_iotlb_sync,
> + .flush_iotlb_all = arm_smmu_flush_iotlb_all,
> .iotlb_sync = arm_smmu_iotlb_sync,
> .iova_to_phys = arm_smmu_iova_to_phys,
> .add_device = arm_smmu_add_device,
> --
> 1.8.3
>
>

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