iommu/arm-smmu: Call configuration impl hook before consuming features (6a79a5a3) · Commits · 戴 / test

'cfg_probe' hook is called at the very end of configuration probing procedure and therefore features override and workaround may become complex like for ID register fixups. In preparation for adding Marvell errata move 'cfg_probe' a bit earlier to have chance to adjust the detected features before we start consuming them. Since the Cavium quirk (the only user) does not alter features it is safe to do so. Suggested-by:

Robin Murphy <robin.murphy@arm.com> Signed-off-by:

Tomasz Nowicki <tn@semihalf.com> Reviewed-by:

Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/20200715070649.18733-2-tn@semihalf.com Signed-off-by:

Will Deacon <will@kernel.org>

drivers/iommu/arm-smmu.c

+7 −4

Original line number	Diff line number	Diff line
		@@ -1728,7 +1728,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
		unsigned int size;
		u32 id;
		bool cttw_reg, cttw_fw = smmu->features & ARM_SMMU_FEAT_COHERENT_WALK;
		int i;
		int i, ret;

		dev_notice(smmu->dev, "probing hardware configuration...\n");
		dev_notice(smmu->dev, "SMMUv%d with:\n",
		@@ -1891,6 +1891,12 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
		smmu->features \|= ARM_SMMU_FEAT_FMT_AARCH64_64K;
		}

		if (smmu->impl && smmu->impl->cfg_probe) {
		ret = smmu->impl->cfg_probe(smmu);
		if (ret)
		return ret;
		}

		/* Now we've corralled the various formats, what'll it do? */
		if (smmu->features & ARM_SMMU_FEAT_FMT_AARCH32_S)
		smmu->pgsize_bitmap \|= SZ_4K \| SZ_64K \| SZ_1M \| SZ_16M;
		@@ -1918,9 +1924,6 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
		dev_notice(smmu->dev, "\tStage-2: %lu-bit IPA -> %lu-bit PA\n",
		smmu->ipa_size, smmu->pa_size);

		if (smmu->impl && smmu->impl->cfg_probe)
		return smmu->impl->cfg_probe(smmu);

		return 0;
		}

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