[PATCH v3 10/14] iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VIRQ for vIRQ coverage

[Nicolin Chen]

The handler will get vDEVICE object from the given mdev and convert it to
its per-vIOMMU virtual ID to mimic a real IOMMU driver.

Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
---
 drivers/iommu/iommufd/iommufd_test.h | 10 ++++++++++
 drivers/iommu/iommufd/selftest.c     | 30 ++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index a6b7a163f636..3037904f2e52 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -24,6 +24,7 @@ enum {
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
 	IOMMU_TEST_OP_TRIGGER_IOPF,
 	IOMMU_TEST_OP_DEV_CHECK_CACHE,
+	IOMMU_TEST_OP_TRIGGER_VIRQ,
 };
 
 enum {
@@ -145,6 +146,9 @@ struct iommu_test_cmd {
 			__u32 id;
 			__u32 cache;
 		} check_dev_cache;
+		struct {
+			__u32 dev_id;
+		} trigger_virq;
 	};
 	__u32 last;
 };
@@ -212,4 +216,10 @@ struct iommu_viommu_invalidate_selftest {
 	__u32 cache_id;
 };
 
+#define IOMMU_VIRQ_TYPE_SELFTEST 0xbeefbeef
+
+struct iommu_viommu_irq_selftest {
+	__u32 virt_id;
+};
+
 #endif
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index d1438d81e664..0785c9447102 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -1631,6 +1631,34 @@ static int iommufd_test_trigger_iopf(struct iommufd_ucmd *ucmd,
 	return 0;
 }
 
+static int iommufd_test_trigger_virq(struct iommufd_ucmd *ucmd,
+				     struct iommu_test_cmd *cmd)
+{
+	struct iommu_viommu_irq_selftest test = {};
+	struct iommufd_device *idev;
+	struct mock_dev *mdev;
+	int rc = -ENOENT;
+
+	idev = iommufd_get_device(ucmd, cmd->trigger_virq.dev_id);
+	if (IS_ERR(idev))
+		return PTR_ERR(idev);
+	mdev = to_mock_dev(idev->dev);
+
+	down_read(&mdev->viommu_rwsem);
+	if (!mdev->viommu || !mdev->vdev_id)
+		goto out_unlock;
+
+	test.virt_id = mdev->vdev_id;
+	rc = iommufd_viommu_report_irq(&mdev->viommu->core,
+				       IOMMU_VIRQ_TYPE_SELFTEST, &test,
+				       sizeof(test));
+out_unlock:
+	up_read(&mdev->viommu_rwsem);
+	iommufd_put_object(ucmd->ictx, &idev->obj);
+
+	return rc;
+}
+
 void iommufd_selftest_destroy(struct iommufd_object *obj)
 {
 	struct selftest_obj *sobj = to_selftest_obj(obj);
@@ -1712,6 +1740,8 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 					  cmd->dirty.flags);
 	case IOMMU_TEST_OP_TRIGGER_IOPF:
 		return iommufd_test_trigger_iopf(ucmd, cmd);
+	case IOMMU_TEST_OP_TRIGGER_VIRQ:
+		return iommufd_test_trigger_virq(ucmd, cmd);
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.43.0