Add page_response iommu ops callback to send page response to
the device that generated io page fault.
Signed-off-by: Vivek Gautam <vivek.gau...@arm.com>
---
drivers/iommu/virtio-iommu.c | 47 ++++++++++++++++++++++++++++++++++++
1 file changed, 47 insertions(+)
diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index 08f1294baeab..6d62d9eae452 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -1778,6 +1778,52 @@ static int viommu_of_xlate(struct device *dev, struct
of_phandle_args *args)
return iommu_fwspec_add_ids(dev, args->args, 1);
}
+static int viommu_page_response(struct device *dev,
+ struct iommu_fault_event *evt,
+ struct iommu_page_response *resp)
+{
+ struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
+ struct viommu_domain *vdomain = to_viommu_domain(domain);
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+ struct viommu_endpoint *vdev = dev_iommu_priv_get(dev);
+ struct viommu_dev *viommu = vdev->viommu;
+ bool pasid_valid = resp->flags & IOMMU_PAGE_RESP_PASID_VALID;
+ struct virtio_iommu_req_page_resp req = {
+ .head.type = VIRTIO_IOMMU_T_PAGE_RESP,
+ .domain = cpu_to_le32(vdomain->id),
+ .endpoint = cpu_to_le32(fwspec->ids[0]),
+ };
+
+ if (vdev->pri_supported) {
+ bool needs_pasid = (evt->fault.prm.flags &
+ IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID);
+
+ req.pasid_valid = needs_pasid && pasid_valid;
+ req.flags = cpu_to_le32((needs_pasid && pasid_valid) ?
+ VIRTIO_IOMMU_PAGE_RESP_PASID_VALID : 0);
+ req.pasid = cpu_to_le32(resp->pasid);
+ req.grpid = cpu_to_le32(resp->grpid);
+
+ switch (resp->code) {
+ case IOMMU_PAGE_RESP_FAILURE:
+ req.resp_code =
cpu_to_le16(VIRTIO_IOMMU_PAGE_RESP_FAILURE);
+ break;
+ case IOMMU_PAGE_RESP_INVALID:
+ req.resp_code =
cpu_to_le16(VIRTIO_IOMMU_PAGE_RESP_INVALID);
+ break;
+ case IOMMU_PAGE_RESP_SUCCESS:
+ req.resp_code =
cpu_to_le16(VIRTIO_IOMMU_PAGE_RESP_SUCCESS);
+ break;
+ default:
+ return -EINVAL;
+ }
+ } else {
+ return -ENODEV;
+ }
+
+ return viommu_send_req_sync(viommu, &req, sizeof(req));
+}
+
static u32 viommu_sva_get_pasid(struct iommu_sva *handle)
{
struct viommu_sva_bond *bond = sva_to_viommu_bond(handle);
@@ -2155,6 +2201,7 @@ static struct iommu_ops viommu_ops = {
.sva_bind = viommu_sva_bind,
.sva_unbind = viommu_sva_unbind,
.sva_get_pasid = viommu_sva_get_pasid,
+ .page_response = viommu_page_response,
};
static int viommu_init_vqs(struct viommu_dev *viommu)
--
2.17.1
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