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authorWill Deacon <will@kernel.org>2021-06-16 13:30:55 +0300
committerWill Deacon <will@kernel.org>2021-06-16 13:30:55 +0300
commitddd25670d39b2181c7bec33301f2d24cdcf25dde (patch)
treeb87ed010ae0fa8d68822c5dc369032a015470fa4 /drivers/iommu
parentaffa909571b0036b5d46aeff940ad4358f4abe1d (diff)
parentb472191f0a0ce6d98d61e939118cfd6ad0ff91e7 (diff)
downloadlinux-ddd25670d39b2181c7bec33301f2d24cdcf25dde.tar.xz
Merge branch 'for-thierry/arm-smmu' into for-joerg/arm-smmu/updates
Merge in support for the Arm SMMU '->probe_finalize()' implementation callback, which is required to prevent early faults in conjunction with Nvidia's memory controller. * for-thierry/arm-smmu: iommu/arm-smmu: Check smmu->impl pointer before dereferencing iommu/arm-smmu: Implement ->probe_finalize()
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/arm/arm-smmu/arm-smmu.c13
-rw-r--r--drivers/iommu/arm/arm-smmu/arm-smmu.h1
2 files changed, 14 insertions, 0 deletions
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 22be819d6b7f..d3c6f54110a5 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -1454,6 +1454,18 @@ static void arm_smmu_release_device(struct device *dev)
iommu_fwspec_free(dev);
}
+static void arm_smmu_probe_finalize(struct device *dev)
+{
+ struct arm_smmu_master_cfg *cfg;
+ struct arm_smmu_device *smmu;
+
+ cfg = dev_iommu_priv_get(dev);
+ smmu = cfg->smmu;
+
+ if (smmu->impl && smmu->impl->probe_finalize)
+ smmu->impl->probe_finalize(smmu, dev);
+}
+
static struct iommu_group *arm_smmu_device_group(struct device *dev)
{
struct arm_smmu_master_cfg *cfg = dev_iommu_priv_get(dev);
@@ -1573,6 +1585,7 @@ static struct iommu_ops arm_smmu_ops = {
.iova_to_phys = arm_smmu_iova_to_phys,
.probe_device = arm_smmu_probe_device,
.release_device = arm_smmu_release_device,
+ .probe_finalize = arm_smmu_probe_finalize,
.device_group = arm_smmu_device_group,
.enable_nesting = arm_smmu_enable_nesting,
.set_pgtable_quirks = arm_smmu_set_pgtable_quirks,
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index c31a59d35c64..147c95e7c59c 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -439,6 +439,7 @@ struct arm_smmu_impl {
struct device *dev, int start);
void (*write_s2cr)(struct arm_smmu_device *smmu, int idx);
void (*write_sctlr)(struct arm_smmu_device *smmu, int idx, u32 reg);
+ void (*probe_finalize)(struct arm_smmu_device *smmu, struct device *dev);
};
#define INVALID_SMENDX -1