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iommu/arm-smmu: Implement ->probe_finalize()

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Implement a ->probe_finalize() callback that can be used by vendor
implementations to perform extra programming necessary after devices
have been attached to the SMMU.

Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20210603164632.1000458-4-thierry.reding@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Thierry Reding 2021-06-03 18:46:26 +02:00 committed by Will Deacon
parent 6efb943b86
commit 0d97174aea
2 changed files with 14 additions and 0 deletions
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13
drivers/iommu/arm/arm-smmu/arm-smmu.c
View File

@ -1450,6 +1450,18 @@ 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->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);
@ -1569,6 +1581,7 @@ 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,

1
drivers/iommu/arm/arm-smmu/arm-smmu.h
View File

@ -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