Re: [PATCH v2 5/5] iommu/mediatek: Always tlb_flush_all when each PM resume
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Date: 2022-01-10 11:46:42
Also in:
linux-iommu, linux-media, linux-mediatek, lkml
Il 08/12/21 13:07, Dafna Hirschfeld ha scritto:
From: Yong Wu <yong.wu@mediatek.com> Prepare for 2 HWs that sharing pgtable in different power-domains. When there are 2 M4U HWs, it may has problem in the flush_range in which we get the pm_status via the m4u dev, BUT that function don't reflect the real power-domain status of the HW since there may be other HW also use that power-domain. DAM allocation is often done while the allocating device is runtime suspended. In such a case the iommu will also be suspended and partial flushing of the tlb will not be executed. Therefore, we add a tlb_flush_all in the pm_runtime_resume to make sure the tlb is always clean. In other case, the iommu's power should be active via device link with smi. Signed-off-by: Yong Wu <yong.wu@mediatek.com> [move the call to mtk_iommu_tlb_flush_all to the bottom of resume cb, improve doc/log] Signed-off-by: Dafna Hirschfeld <redacted>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel