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 2/3] iommu/qcom: Use identity default domains for the MSM GPU and display
Date: Mon, 2 Nov 2026 10:46:39 +0100 [thread overview]
Message-ID: <798f1e79-1771-49b8-9d4d-705b013255e4@oss.qualcomm.com> (raw)
In-Reply-To: <20261031-msm-smmu-identity-v1-2-a2a70580eebd@oss.qualcomm.com>
On 10/30/26 11:04 PM, Dmitry Baryshkov wrote:
> drm/msm writes the addresses dma_map_sgtable() returns for the DRM
> device into its own page tables, so they have to be physical addresses,
> i.e. the device must not use iommu-dma. qcom_iommu has no
> def_domain_type, so the MDP5 and Adreno devices do get iommu-dma, the
> buffers end up mapped at IOVAs of the unused default domain and the
> db410c GPU fails to start.
>
> Use identity default domains for these devices, as arm-smmu-qcom does.
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
> ---
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Konrad
next prev parent reply other threads:[~2026-11-02 9:46 UTC|newest]
Thread overview: 12+ 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
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 [this message]
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
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