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Date: Thu, 22 Sep 2022 10:16:46 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Nicolin Chen <nicolinc@...dia.com>, joro@...tes.org,
suravee.suthikulpanit@....com, will@...nel.org,
robin.murphy@....com, robdclark@...il.com, dwmw2@...radead.org,
agross@...nel.org, bjorn.andersson@...aro.org,
matthias.bgg@...il.com, orsonzhai@...il.com,
baolin.wang@...ux.alibaba.com, zhang.lyra@...il.com,
jean-philippe@...aro.org, sricharan@...eaurora.org
Cc: baolu.lu@...ux.intel.com, jgg@...dia.com, kevin.tian@...el.com,
konrad.dybcio@...ainline.org, yong.wu@...iatek.com,
thierry.reding@...il.com, vdumpa@...dia.com, jonathanh@...dia.com,
tglx@...utronix.de, shameerali.kolothum.thodi@...wei.com,
christophe.jaillet@...adoo.fr, thunder.leizhen@...wei.com,
quic_saipraka@...cinc.com, jon@...id-run.com,
yangyingliang@...wei.com, iommu@...ts.linux.dev,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-arm-msm@...r.kernel.org, linux-mediatek@...ts.infradead.org,
linux-tegra@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v4 5/6] iommu: Use EINVAL for incompatible device/domain
in ->attach_dev
On 9/21/22 4:23 PM, Nicolin Chen wrote:
> Following the new rules in include/linux/iommu.h kdocs, update all drivers
> ->attach_dev callback functions to return EINVAL in the failure paths that
> are related to domain incompatibility.
>
> Also, drop adjacent error prints to prevent a kernel log spam.
>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 11 +----------
> drivers/iommu/arm/arm-smmu/arm-smmu.c | 3 ---
> drivers/iommu/arm/arm-smmu/qcom_iommu.c | 7 +------
> drivers/iommu/intel/iommu.c | 10 +++-------
> drivers/iommu/ipmmu-vmsa.c | 2 --
> drivers/iommu/omap-iommu.c | 2 +-
> drivers/iommu/sprd-iommu.c | 4 +---
> drivers/iommu/tegra-gart.c | 2 +-
> drivers/iommu/virtio-iommu.c | 3 +--
> 9 files changed, 9 insertions(+), 35 deletions(-)
>
> 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 d32b02336411..f96f8aad8280 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2429,23 +2429,14 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
> goto out_unlock;
> }
> } else if (smmu_domain->smmu != smmu) {
> - dev_err(dev,
> - "cannot attach to SMMU %s (upstream of %s)\n",
> - dev_name(smmu_domain->smmu->dev),
> - dev_name(smmu->dev));
> - ret = -ENXIO;
> + ret = -EINVAL;
> goto out_unlock;
> } else if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1 &&
> master->ssid_bits != smmu_domain->s1_cfg.s1cdmax) {
> - dev_err(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_err(dev, "cannot attach to stall-%s domain\n",
> - smmu_domain->stall_enabled ? "enabled" : "disabled");
> ret = -EINVAL;
> goto out_unlock;
> }
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> index dfa82df00342..dbd12da31707 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
> @@ -1167,9 +1167,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
> * different SMMUs.
> */
> if (smmu_domain->smmu != smmu) {
> - dev_err(dev,
> - "cannot attach to SMMU %s whilst already attached to domain on SMMU %s\n",
> - dev_name(smmu_domain->smmu->dev), dev_name(smmu->dev));
> ret = -EINVAL;
> goto rpm_put;
> }
> diff --git a/drivers/iommu/arm/arm-smmu/qcom_iommu.c b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> index 17235116d3bb..37c5ddc212c1 100644
> --- a/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> +++ b/drivers/iommu/arm/arm-smmu/qcom_iommu.c
> @@ -381,13 +381,8 @@ static int qcom_iommu_attach_dev(struct iommu_domain *domain, struct device *dev
> * Sanity check the domain. We don't support domains across
> * different IOMMUs.
> */
> - if (qcom_domain->iommu != qcom_iommu) {
> - dev_err(dev, "cannot attach to IOMMU %s while already "
> - "attached to domain on IOMMU %s\n",
> - dev_name(qcom_domain->iommu->dev),
> - dev_name(qcom_iommu->dev));
> + if (qcom_domain->iommu != qcom_iommu)
> return -EINVAL;
> - }
>
> return 0;
> }
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 1f2cd43cf9bc..51ef42b1bd4e 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4158,19 +4158,15 @@ static int prepare_domain_attach_device(struct iommu_domain *domain,
> return -ENODEV;
>
> if (dmar_domain->force_snooping && !ecap_sc_support(iommu->ecap))
> - return -EOPNOTSUPP;
> + return -EINVAL;
>
> /* check if this iommu agaw is sufficient for max mapped address */
> addr_width = agaw_to_width(iommu->agaw);
> if (addr_width > cap_mgaw(iommu->cap))
> addr_width = cap_mgaw(iommu->cap);
>
> - if (dmar_domain->max_addr > (1LL << addr_width)) {
> - dev_err(dev, "%s: iommu width (%d) is not "
> - "sufficient for the mapped address (%llx)\n",
> - __func__, addr_width, dmar_domain->max_addr);
> - return -EFAULT;
> - }
> + if (dmar_domain->max_addr > (1LL << addr_width))
> + return -EINVAL;
> dmar_domain->gaw = addr_width;
>
> /*
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index 1d42084d0276..f5217a4cb9b3 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -628,8 +628,6 @@ static int ipmmu_attach_device(struct iommu_domain *io_domain,
> * Something is wrong, we can't attach two devices using
> * different IOMMUs to the same domain.
> */
> - dev_err(dev, "Can't attach IPMMU %s to domain on IPMMU %s\n",
> - dev_name(mmu->dev), dev_name(domain->mmu->dev));
> ret = -EINVAL;
> } else
> dev_info(dev, "Reusing IPMMU context %u\n", domain->context_id);
> diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c
> index 447e40d55918..be12f49140c7 100644
> --- a/drivers/iommu/omap-iommu.c
> +++ b/drivers/iommu/omap-iommu.c
> @@ -1472,7 +1472,7 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev)
> /* only a single client device can be attached to a domain */
> if (omap_domain->dev) {
> dev_err(dev, "iommu domain is already attached\n");
> - ret = -EBUSY;
> + ret = -EINVAL;
> goto out;
> }
>
> diff --git a/drivers/iommu/sprd-iommu.c b/drivers/iommu/sprd-iommu.c
> index 511959c8a14d..945576039c9e 100644
> --- a/drivers/iommu/sprd-iommu.c
> +++ b/drivers/iommu/sprd-iommu.c
> @@ -237,10 +237,8 @@ static int sprd_iommu_attach_device(struct iommu_domain *domain,
> struct sprd_iommu_domain *dom = to_sprd_domain(domain);
> size_t pgt_size = sprd_iommu_pgt_size(domain);
>
> - if (dom->sdev) {
> - pr_err("There's already a device attached to this domain.\n");
> + if (dom->sdev)
> return -EINVAL;
> - }
>
> dom->pgt_va = dma_alloc_coherent(sdev->dev, pgt_size, &dom->pgt_pa, GFP_KERNEL);
> if (!dom->pgt_va)
> diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
> index e5ca3cf1a949..ed53279d1106 100644
> --- a/drivers/iommu/tegra-gart.c
> +++ b/drivers/iommu/tegra-gart.c
> @@ -112,7 +112,7 @@ static int gart_iommu_attach_dev(struct iommu_domain *domain,
> spin_lock(&gart->dom_lock);
>
> if (gart->active_domain && gart->active_domain != domain) {
> - ret = -EBUSY;
> + ret = -EINVAL;
> } else if (dev_iommu_priv_get(dev) != domain) {
> dev_iommu_priv_set(dev, domain);
> gart->active_domain = domain;
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 4c652773fd6c..87128266b6e3 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -733,8 +733,7 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
> */
> ret = viommu_domain_finalise(vdev, domain);
> } else if (vdomain->viommu != vdev->viommu) {
> - dev_err(dev, "cannot attach to foreign vIOMMU\n");
> - ret = -EXDEV;
> + ret = -EINVAL;
> }
> mutex_unlock(&vdomain->mutex);
>
For iommu/vt-d changes:
Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
Best regards,
baolu
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