After page requests are handled, software must respond to the device
which raised the page request with the result. This is done through
the iommu ops.page_response if the request was reported to outside of
vendor iommu driver through iommu_report_device_fault(). This adds the
VT-d implementation of page_response ops.
Co-developed-by: Jacob Pan <jacob.jun....@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun....@linux.intel.com>
Co-developed-by: Liu Yi L <yi.l....@intel.com>
Signed-off-by: Liu Yi L <yi.l....@intel.com>
Signed-off-by: Lu Baolu <baolu...@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.t...@intel.com>
---
drivers/iommu/intel/iommu.c | 1 +
drivers/iommu/intel/svm.c | 99 +++++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 3 ++
3 files changed, 103 insertions(+)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 097a71b3b75d..a939d17d40a1 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -6073,6 +6073,7 @@ const struct iommu_ops intel_iommu_ops = {
.sva_bind = intel_svm_bind,
.sva_unbind = intel_svm_unbind,
.sva_get_pasid = intel_svm_get_pasid,
+ .page_response = intel_svm_page_response,
#endif
};
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 140114ab1375..85ce8daa3177 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -1078,3 +1078,102 @@ int intel_svm_get_pasid(struct iommu_sva *sva)
return pasid;
}
+
+int intel_svm_page_response(struct device *dev,
+ struct iommu_fault_event *evt,
+ struct iommu_page_response *msg)
+{
+ struct iommu_fault_page_request *prm;
+ struct intel_svm_dev *sdev = NULL;
+ struct intel_svm *svm = NULL;
+ struct intel_iommu *iommu;
+ bool private_present;
+ bool pasid_present;
+ bool last_page;
+ u8 bus, devfn;
+ int ret = 0;
+ u16 sid;
+
+ if (!dev || !dev_is_pci(dev))
+ return -ENODEV;
+
+ iommu = device_to_iommu(dev, &bus, &devfn);
+ if (!iommu)
+ return -ENODEV;
+
+ if (!msg || !evt)
+ return -EINVAL;
+
+ mutex_lock(&pasid_mutex);
+
+ prm = &evt->fault.prm;
+ sid = PCI_DEVID(bus, devfn);
+ pasid_present = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PASID_VALID;
+ private_present = prm->flags & IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA;
+ last_page = prm->flags & IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE;
+
+ if (!pasid_present) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (prm->pasid == 0 || prm->pasid >= PASID_MAX) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = pasid_to_svm_sdev(dev, prm->pasid, &svm, &sdev);
+ if (ret || !sdev) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ /*
+ * For responses from userspace, need to make sure that the
+ * pasid has been bound to its mm.
+ */
+ if (svm->flags & SVM_FLAG_GUEST_MODE) {
+ struct mm_struct *mm;
+
+ mm = get_task_mm(current);
+ if (!mm) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ if (mm != svm->mm) {
+ ret = -ENODEV;
+ mmput(mm);
+ goto out;
+ }
+
+ mmput(mm);
+ }
+
+ /*
+ * Per VT-d spec. v3.0 ch7.7, system software must respond
+ * with page group response if private data is present (PDP)
+ * or last page in group (LPIG) bit is set. This is an
+ * additional VT-d requirement beyond PCI ATS spec.
+ */
+ if (last_page || private_present) {
+ struct qi_desc desc;
+
+ desc.qw0 = QI_PGRP_PASID(prm->pasid) | QI_PGRP_DID(sid) |
+ QI_PGRP_PASID_P(pasid_present) |
+ QI_PGRP_PDP(private_present) |
+ QI_PGRP_RESP_CODE(msg->code) |
+ QI_PGRP_RESP_TYPE;
+ desc.qw1 = QI_PGRP_IDX(prm->grpid) | QI_PGRP_LPIG(last_page);
+ desc.qw2 = 0;
+ desc.qw3 = 0;
+ if (private_present)
+ memcpy(&desc.qw2, prm->private_data,
+ sizeof(prm->private_data));
+
+ qi_submit_sync(iommu, &desc, 1, 0);
+ }
+out:
+ mutex_unlock(&pasid_mutex);
+ return ret;
+}
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 7e69aec60592..b1ed2f25f7c0 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -742,6 +742,9 @@ struct iommu_sva *intel_svm_bind(struct device *dev, struct
mm_struct *mm,
void *drvdata);
void intel_svm_unbind(struct iommu_sva *handle);
int intel_svm_get_pasid(struct iommu_sva *handle);
+int intel_svm_page_response(struct device *dev, struct iommu_fault_event *evt,
+ struct iommu_page_response *msg);
+
struct svm_dev_ops;
struct intel_svm_dev {
--
2.17.1
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