| Message ID | 253f8098664f78f5b5a8a7deb816af8ad7d37122.1663227492.git.nicolinc@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Define EINVAL as device/domain incompatibility | expand |
> From: Nicolin Chen <nicolinc@nvidia.com> > Sent: Thursday, September 15, 2022 3:59 PM > > diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c > index c5e7e8b020a5..4cadbd744b7f 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 -EBUSY; -EEXIST. It's not a busy condition which might change sometime after. btw below -EVINAL in viommu should be converted to -ENODEV too since it's a check purely on device side: viommu_domain_finalise() viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap); if (viommu_page_size > PAGE_SIZE) { dev_err(vdev->dev, "granule 0x%lx larger than system page size 0x%lx\n", viommu_page_size, PAGE_SIZE); return -EINVAL; }
On Tue, Sep 20, 2022 at 06:29:28AM +0000, Tian, Kevin wrote: > External email: Use caution opening links or attachments > > > > From: Nicolin Chen <nicolinc@nvidia.com> > > Sent: Thursday, September 15, 2022 3:59 PM > > > > diff --git a/drivers/iommu/intel/pasid.c b/drivers/iommu/intel/pasid.c > > index c5e7e8b020a5..4cadbd744b7f 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 -EBUSY; > > -EEXIST. It's not a busy condition which might change sometime after. > > btw below -EVINAL in viommu should be converted to -ENODEV too > since it's a check purely on device side: > > viommu_domain_finalise() > viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap); > if (viommu_page_size > PAGE_SIZE) { > dev_err(vdev->dev, > "granule 0x%lx larger than system page size 0x%lx\n", > viommu_page_size, PAGE_SIZE); > return -EINVAL; > } Fixed both places. Thanks!
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 011f9ab7f743..b4a1c0f79c3e 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 c5e7e8b020a5..4cadbd744b7f 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 -EBUSY; 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 7e363b1f24df..be1a7d1cc630 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -607,7 +607,7 @@ 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 d9cf2820c02e..447e40d55918 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);
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. Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> --- 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 ++-- 5 files changed, 10 insertions(+), 8 deletions(-)