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Message-ID: <20221109184636.14264-1-nicolinc@nvidia.com>
Date: Wed, 9 Nov 2022 10:46:36 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>, <joro@...tes.org>
CC: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <jgg@...dia.com>,
<robin.murphy@....com>
Subject: [PATCH v2] iommu/arm-smmu-v3: Restore prints in arm_smmu_attach_dev()
The prints for incompatible failures in arm_smmu_attach_dev() might be
still useful for error diagnosis. As VFIO and IOMMUFD would do testing
attach() call, having previous dev_err() isn't ideal either.
Add the prints back using dev_dbg().
Fixes: f4a147735793 ("iommu: Use EINVAL for incompatible device/domain in ->attach_dev")
Suggested-by: Will Deacon <will@...nel.org>
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
Changelog
v1->v2:
* Add "Fixes" line and Reviewed-by from Jason
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index ab160198edd6..076d3710b1fe 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2433,14 +2433,21 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
goto out_unlock;
}
} else if (smmu_domain->smmu != smmu) {
+ dev_dbg(dev, "cannot attach to SMMU %s (upstream of %s)\n",
+ dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
ret = -EINVAL;
goto out_unlock;
} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
master->ssid_bits != smmu_domain->s1_cfg.s1cdmax) {
+ dev_dbg(dev,
+ "cannot attach to incompatible domain (%u SSID bits != %u)\n",
+ smmu_domain->s1_cfg.s1cdmax, master->ssid_bits);
ret = -EINVAL;
goto out_unlock;
} else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
smmu_domain->stall_enabled != master->stall_enabled) {
+ dev_dbg(dev, "cannot attach to stall-%s domain\n",
+ smmu_domain->stall_enabled ? "enabled" : "disabled");
ret = -EINVAL;
goto out_unlock;
}
--
2.38.1
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