[RFC 6/8] iommufd/selftest: Add test ops to test pasid attach/detach

[Yi Liu]

This adds 4 test ops for pasid attach/replace/detach testing. There are
ops to attach/detach pasid, and also op to check the attached domain of
a pasid.

Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
 drivers/iommu/iommufd/iommufd_test.h | 24 +++++++
 drivers/iommu/iommufd/selftest.c     | 98 ++++++++++++++++++++++++++++
 2 files changed, 122 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 65a363f5e81e..e2ab61251ef9 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -21,6 +21,10 @@ enum {
 	IOMMU_TEST_OP_ACCESS_REPLACE_IOAS,
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
 	IOMMU_TEST_OP_DEV_CHECK_DATA,
+	IOMMU_TEST_OP_PASID_ATTACH,
+	IOMMU_TEST_OP_PASID_REPLACE,
+	IOMMU_TEST_OP_PASID_DETACH,
+	IOMMU_TEST_OP_PASID_CHECK_DOMAIN,
 };
 
 enum {
@@ -109,6 +113,26 @@ struct iommu_test_cmd {
 		struct {
 			__u32 val;
 		} check_dev_data;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH */
+		} pasid_attach;
+		struct {
+			__u32 pasid;
+			__u32 pt_id;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_ATTACH */
+		} pasid_replace;
+		struct {
+			__u32 pasid;
+			/* @id is stdev_id for IOMMU_TEST_OP_PASID_DETACH */
+		} pasid_detach;
+		struct {
+			__u32 pasid;
+			__u32 hwpt_id;
+			__u64 out_result_ptr;
+			/* @id is stdev_id for IOMMU_TEST_OP_HWPT_GET_DOMAIN */
+		} pasid_check;
 	};
 	__u32 last;
 };
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 1f2ce4ffee4e..bfc81615e9f9 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -1238,6 +1238,96 @@ static_assert((unsigned int)MOCK_ACCESS_RW_WRITE == IOMMUFD_ACCESS_RW_WRITE);
 static_assert((unsigned int)MOCK_ACCESS_RW_SLOW_PATH ==
 	      __IOMMUFD_ACCESS_RW_SLOW_PATH);
 
+static int iommufd_test_pasid_attach(struct iommufd_ucmd *ucmd,
+				     struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+	int rc;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	rc = iommufd_device_pasid_attach(sobj->idev.idev,
+					 cmd->pasid_attach.pasid,
+					 &cmd->pasid_attach.pt_id);
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
+static int iommufd_test_pasid_replace(struct iommufd_ucmd *ucmd,
+				      struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+	int rc;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	rc = iommufd_device_pasid_replace(sobj->idev.idev,
+					  cmd->pasid_attach.pasid,
+					  &cmd->pasid_attach.pt_id);
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
+static int iommufd_test_pasid_detach(struct iommufd_ucmd *ucmd,
+				     struct iommu_test_cmd *cmd)
+{
+	struct selftest_obj *sobj;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	iommufd_device_pasid_detach(sobj->idev.idev,
+				    cmd->pasid_detach.pasid);
+	iommufd_put_object(&sobj->obj);
+	return 0;
+}
+
+static int iommufd_test_pasid_check_domain(struct iommufd_ucmd *ucmd,
+					   struct iommu_test_cmd *cmd)
+{
+	struct iommu_domain *attached_domain, *expect_domain = NULL;
+	struct iommufd_hw_pagetable *hwpt = NULL;
+	struct selftest_obj *sobj;
+	struct mock_dev *mdev;
+	bool result;
+	int rc = 0;
+
+	sobj = iommufd_test_get_self_test_device(ucmd->ictx, cmd->id);
+	if (IS_ERR(sobj))
+		return PTR_ERR(sobj);
+
+	mdev = sobj->idev.mock_dev;
+
+	attached_domain = iommu_get_domain_for_dev_pasid(&mdev->dev,
+							 cmd->pasid_check.pasid, 0);
+	if (IS_ERR(attached_domain))
+		attached_domain = NULL;
+
+	if (cmd->pasid_check.hwpt_id) {
+		hwpt = iommufd_get_hwpt(ucmd, cmd->pasid_check.hwpt_id);
+		if (IS_ERR(hwpt)) {
+			rc = PTR_ERR(hwpt);
+			goto out_put_dev;
+		}
+		expect_domain = hwpt->domain;
+	}
+
+	result = (attached_domain == expect_domain) ? 1 : 0;
+	if (copy_to_user(u64_to_user_ptr(cmd->pasid_check.out_result_ptr),
+			 &result, sizeof(result)))
+		rc = -EFAULT;
+	if (hwpt)
+		iommufd_put_object(&hwpt->obj);
+out_put_dev:
+	iommufd_put_object(&sobj->obj);
+	return rc;
+}
+
 void iommufd_selftest_destroy(struct iommufd_object *obj)
 {
 	struct selftest_obj *sobj = container_of(obj, struct selftest_obj, obj);
@@ -1309,6 +1399,14 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 			return -EINVAL;
 		iommufd_test_memory_limit = cmd->memory_limit.limit;
 		return 0;
+	case IOMMU_TEST_OP_PASID_ATTACH:
+		return iommufd_test_pasid_attach(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_REPLACE:
+		return iommufd_test_pasid_replace(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_DETACH:
+		return iommufd_test_pasid_detach(ucmd, cmd);
+	case IOMMU_TEST_OP_PASID_CHECK_DOMAIN:
+		return iommufd_test_pasid_check_domain(ucmd, cmd);
 	default:
 		return -EOPNOTSUPP;
 	}
-- 
2.34.1