From: Yong Wu Date: Wed, 8 Dec 2021 12:07:44 +0000 (+0200) Subject: iommu/mediatek: Always tlb_flush_all when each PM resume X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=4f23f6d45821701c68b99c2847a075472b53198c;p=linux.git iommu/mediatek: Always tlb_flush_all when each PM resume 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 [move the call to mtk_iommu_tlb_flush_all to the bottom of resume cb, improve doc/log] Signed-off-by: Dafna Hirschfeld Reviewed-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20211208120744.2415-6-dafna.hirschfeld@collabora.com Signed-off-by: Joerg Roedel --- diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 7cbfe3bfaaaba..eb43e7edb9dc7 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -975,6 +975,13 @@ static int __maybe_unused mtk_iommu_runtime_resume(struct device *dev) writel_relaxed(reg->ivrp_paddr, base + REG_MMU_IVRP_PADDR); writel_relaxed(reg->vld_pa_rng, base + REG_MMU_VLD_PA_RNG); writel(m4u_dom->cfg.arm_v7s_cfg.ttbr & MMU_PT_ADDR_MASK, base + REG_MMU_PT_BASE_ADDR); + + /* + * Users may allocate dma buffer before they call pm_runtime_get, + * in which case it will lack the necessary tlb flush. + * Thus, make sure to update the tlb after each PM resume. + */ + mtk_iommu_tlb_flush_all(data); return 0; }