[PATCH 1/3] iommu/qcom: Invalidate the TLB in flush_iotlb_all

[Konrad Dybcio]

On 10/30/26 11:04 PM, Dmitry Baryshkov wrote:
> qcom_iommu_flush_iotlb_all() only waits for a TLB sync and never
> invalidates anything. iommu_unmap() users do not notice, since
> io-pgtable invalidates each page through the gather, but drm/msm unmaps
> with a NULL gather and relies on flush_iotlb_all. On db410c the GPU then
> hangs on stale TLB entries as soon as another process reuses the IOVAs.
> 
> Invalidate the whole context, as arm-smmu does, and keep iotlb_sync a
> plain sync.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at oss.qualcomm.com>
> ---

Acked-by: Konrad Dybcio <konrad.dybcio at oss.qualcomm.com>

Konrad