From bd7ebb7719356d750b1b4d671535922bae43fb3b Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Mon, 17 Oct 2022 16:02:13 -0700 Subject: iommu: Regulate EINVAL in ->attach_dev callback functions Following the new rules in include/linux/iommu.h kdocs, EINVAL now can be used to indicate that domain and device are incompatible by a caller that treats it as a soft failure and tries attaching to another domain. On the other hand, there are ->attach_dev callback functions returning it for obvious device-specific errors. They will result in some inefficiency in the caller handling routine. Update these places to corresponding errnos following the new rules. Link: https://lore.kernel.org/r/5924c03bea637f05feb2a20d624bae086b555ec5.1666042872.git.nicolinc@nvidia.com Reviewed-by: Jean-Philippe Brucker Reviewed-by: Lu Baolu Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- drivers/iommu/fsl_pamu.c | 2 +- drivers/iommu/fsl_pamu_domain.c | 4 ++-- drivers/iommu/intel/pasid.c | 6 ++++-- drivers/iommu/mtk_iommu.c | 2 +- drivers/iommu/omap-iommu.c | 4 ++-- drivers/iommu/virtio-iommu.c | 2 +- 6 files changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/iommu/fsl_pamu.c b/drivers/iommu/fsl_pamu.c index 0d03f837a5d4..2eb3211c8167 100644 --- a/drivers/iommu/fsl_pamu.c +++ b/drivers/iommu/fsl_pamu.c @@ -211,7 +211,7 @@ int pamu_config_ppaace(int liodn, u32 omi, u32 stashid, int prot) ppaace->op_encode.index_ot.omi = omi; } else if (~omi != 0) { pr_debug("bad operation mapping index: %d\n", omi); - return -EINVAL; + return -ENODEV; } /* configure stash id */ diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c index fa20f4b03e12..4408ac3c49b6 100644 --- a/drivers/iommu/fsl_pamu_domain.c +++ b/drivers/iommu/fsl_pamu_domain.c @@ -258,7 +258,7 @@ static int fsl_pamu_attach_device(struct iommu_domain *domain, liodn = of_get_property(dev->of_node, "fsl,liodn", &len); if (!liodn) { pr_debug("missing fsl,liodn property at %pOF\n", dev->of_node); - return -EINVAL; + return -ENODEV; } spin_lock_irqsave(&dma_domain->domain_lock, flags); @@ -267,7 +267,7 @@ static int fsl_pamu_attach_device(struct iommu_domain *domain, if (liodn[i] >= PAACE_NUMBER_ENTRIES) { pr_debug("Invalid liodn %d, attach device failed for %pOF\n", liodn[i], dev->of_node); - ret = -EINVAL; + ret = -ENODEV; break; } diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c index c30ddac40ee5..95d73f19ab61 100644 --- a/drivers/iommu/intel/pasid.c +++ b/drivers/iommu/intel/pasid.c @@ -101,8 +101,10 @@ int intel_pasid_alloc_table(struct device *dev) might_sleep(); info = dev_iommu_priv_get(dev); - if (WARN_ON(!info || !dev_is_pci(dev) || info->pasid_table)) - return -EINVAL; + if (WARN_ON(!info || !dev_is_pci(dev))) + return -ENODEV; + if (WARN_ON(info->pasid_table)) + return -EEXIST; pasid_table = kzalloc(sizeof(*pasid_table), GFP_KERNEL); if (!pasid_table) diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 2ab2ecfe01f8..eda441d0c6b6 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -609,7 +609,7 @@ static int mtk_iommu_domain_finalise(struct mtk_iommu_domain *dom, dom->iop = alloc_io_pgtable_ops(ARM_V7S, &dom->cfg, data); if (!dom->iop) { dev_err(data->dev, "Failed to alloc io pgtable\n"); - return -EINVAL; + return -ENOMEM; } /* Update our support page sizes bitmap */ diff --git a/drivers/iommu/omap-iommu.c b/drivers/iommu/omap-iommu.c index 07ee2600113c..3f153f9e0ac5 100644 --- a/drivers/iommu/omap-iommu.c +++ b/drivers/iommu/omap-iommu.c @@ -1414,7 +1414,7 @@ static int omap_iommu_attach_init(struct device *dev, odomain->num_iommus = omap_iommu_count(dev); if (!odomain->num_iommus) - return -EINVAL; + return -ENODEV; odomain->iommus = kcalloc(odomain->num_iommus, sizeof(*iommu), GFP_ATOMIC); @@ -1464,7 +1464,7 @@ omap_iommu_attach_dev(struct iommu_domain *domain, struct device *dev) if (!arch_data || !arch_data->iommu_dev) { dev_err(dev, "device doesn't have an associated iommu\n"); - return -EINVAL; + return -ENODEV; } spin_lock(&omap_domain->lock); diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c index 8b1b5c270e50..0b64e7f64e68 100644 --- a/drivers/iommu/virtio-iommu.c +++ b/drivers/iommu/virtio-iommu.c @@ -670,7 +670,7 @@ static int viommu_domain_finalise(struct viommu_endpoint *vdev, dev_err(vdev->dev, "granule 0x%lx larger than system page size 0x%lx\n", viommu_page_size, PAGE_SIZE); - return -EINVAL; + return -ENODEV; } ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain, -- cgit v1.2.3