diff options
Diffstat (limited to 'drivers/iommu/of_iommu.c')
| -rw-r--r-- | drivers/iommu/of_iommu.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/iommu/of_iommu.c b/drivers/iommu/of_iommu.c index 026ad2b29dcd..20738aacac89 100644 --- a/drivers/iommu/of_iommu.c +++ b/drivers/iommu/of_iommu.c @@ -8,11 +8,12 @@ #include <linux/export.h> #include <linux/iommu.h> #include <linux/limits.h> -#include <linux/pci.h> +#include <linux/module.h> #include <linux/msi.h> #include <linux/of.h> #include <linux/of_iommu.h> #include <linux/of_pci.h> +#include <linux/pci.h> #include <linux/slab.h> #include <linux/fsl/mc.h> @@ -91,16 +92,16 @@ static int of_iommu_xlate(struct device *dev, { const struct iommu_ops *ops; struct fwnode_handle *fwnode = &iommu_spec->np->fwnode; - int err; + int ret; ops = iommu_ops_from_fwnode(fwnode); if ((ops && !ops->of_xlate) || !of_device_is_available(iommu_spec->np)) return NO_IOMMU; - err = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops); - if (err) - return err; + ret = iommu_fwspec_init(dev, &iommu_spec->np->fwnode, ops); + if (ret) + return ret; /* * The otherwise-empty fwspec handily serves to indicate the specific * IOMMU device we're waiting for, which will be useful if we ever get @@ -109,7 +110,12 @@ static int of_iommu_xlate(struct device *dev, if (!ops) return driver_deferred_probe_check_state(dev); - return ops->of_xlate(dev, iommu_spec); + if (!try_module_get(ops->owner)) + return -ENODEV; + + ret = ops->of_xlate(dev, iommu_spec); + module_put(ops->owner); + return ret; } struct of_pci_iommu_alias_info { @@ -179,6 +185,7 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, .np = master_np, }; + pci_request_acs(); err = pci_for_each_dma_alias(to_pci_dev(dev), of_pci_iommu_init, &info); } else if (dev_is_fsl_mc(dev)) { @@ -196,8 +203,12 @@ const struct iommu_ops *of_iommu_configure(struct device *dev, if (err) break; } - } + fwspec = dev_iommu_fwspec_get(dev); + if (!err && fwspec) + of_property_read_u32(master_np, "pasid-num-bits", + &fwspec->num_pasid_bits); + } /* * Two success conditions can be represented by non-negative err here: |