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iommu/mediatek: Always tlb_flush_all when each PM resume

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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 <dafna.hirschfeld@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20211208120744.2415-6-dafna.hirschfeld@collabora.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yong Wu 2021-12-08 14:07:44 +02:00 committed by Joerg Roedel
parent 15672b6dc5
commit 4f23f6d458
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/mtk_iommu.c
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@ -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;
}