Implement IOMMU_INV_TYPE_TLB invalidations. When
nr_pages is null we interpret this as a context
invalidation.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
The user API needs to be refined to discriminate context
invalidations from NH_VA invalidations. Also the leaf attribute
is not yet properly handled.
---
drivers/iommu/arm-smmu-v3.c | 34 ++++++++++++++++++++++++++++++++++
1 file changed, 34 insertions(+)
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
index 26afafa..e4c7ae8 100644
--- a/drivers/iommu/arm-smmu-v3.c
+++ b/drivers/iommu/arm-smmu-v3.c
@@ -2101,6 +2101,39 @@ static void arm_smmu_unbind_guest_stage(struct iommu_domain *domain,
spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
}
+static int arm_smmu_tlb_invalidate(struct iommu_domain *domain,
+ struct device *dev,
+ struct iommu_tlb_invalidate_info *inv_info)
+{
+ struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+ struct arm_smmu_device *smmu = smmu_domain->smmu;
+ size_t granule = 1 << (inv_info->size + 12);
+
+ if (smmu_domain->stage != ARM_SMMU_DOMAIN_NESTED)
+ return -EINVAL;
+
+ if (!smmu)
+ return -EINVAL;
+
+ if (inv_info->hdr.type != IOMMU_INV_TYPE_TLB)
+ return -EINVAL;
+
+ /*
+ * TODO: On context invalidation, the userspace sets nr_pages to 0.
+ * Refine the API to add a dedicated flags and also properly handle
+ * the leaf parameter.
+ */
+ if (!inv_info->nr_pages) {
+ arm_smmu_tlb_inv_context(smmu_domain);
+ } else {
+ arm_smmu_tlb_inv_range_nosync(inv_info->addr,
+ inv_info->nr_pages * granule,
+ granule, false, smmu_domain);
+ __arm_smmu_tlb_sync(smmu);
+ }
+ return 0;
+}
+
static struct iommu_ops arm_smmu_ops = {
.capable = arm_smmu_capable,
.domain_alloc = arm_smmu_domain_alloc,
@@ -2122,6 +2155,7 @@ static struct iommu_ops arm_smmu_ops = {
.put_resv_regions = arm_smmu_put_resv_regions,
.bind_guest_stage = arm_smmu_bind_guest_stage,
.unbind_guest_stage = arm_smmu_unbind_guest_stage,
+ .tlb_invalidate = arm_smmu_tlb_invalidate,
.pgsize_bitmap = -1UL, /* Restricted during device attach */
};
--
2.5.5
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