From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>,
Rob Clark <robin.clark@oss.qualcomm.com>,
Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
"Joerg Roedel (AMD)" <joro@8bytes.org>
Cc: iommu@lists.linux.dev, linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] iommu/qcom: Invalidate the TLB in flush_iotlb_all
Date: Mon, 2 Nov 2026 10:52:54 +0100 [thread overview]
Message-ID: <c8810f27-8a44-4ac0-9c93-274894eced61@oss.qualcomm.com> (raw)
In-Reply-To: <20261031-msm-smmu-identity-v1-1-a2a70580eebd@oss.qualcomm.com>
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@oss.qualcomm.com>
> ---
Acked-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2026-11-02 9:52 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-30 22:04 [PATCH 0/3] iommu: qcom: Fix the MSM GPU and display with DMA-address based mappings Dmitry Baryshkov
2026-10-30 22:04 ` [PATCH 1/3] iommu/qcom: Invalidate the TLB in flush_iotlb_all Dmitry Baryshkov
2026-10-31 15:27 ` Rob Clark
2026-11-02 9:52 ` Konrad Dybcio [this message]
2026-10-30 22:04 ` [PATCH 2/3] iommu/qcom: Use identity default domains for the MSM GPU and display Dmitry Baryshkov
2026-10-31 15:28 ` Rob Clark
2026-11-02 9:46 ` Konrad Dybcio
2026-10-30 22:04 ` [PATCH 3/3] iommu/arm-smmu-qcom: Use identity default domains for MDP5 Dmitry Baryshkov
2026-10-31 15:28 ` Rob Clark
2026-11-02 9:47 ` Konrad Dybcio
2026-10-31 15:33 ` [PATCH 0/3] iommu: qcom: Fix the MSM GPU and display with DMA-address based mappings Rob Clark
2026-11-02 9:58 ` Dmitry Baryshkov
2026-11-02 21:55 ` Rob Clark
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