[PATCH v2 11/11] iommufd/selftest: Add coverage for IOMMU_HWPT_INVALIDATE ioctl

Yi Liu
2023-05-11T14:43:11Z

From: Nicolin Chen <nicolinc@nvidia.com>

Add a mock_domain_cache_invalidate_user() and a corresponding struct
iommu_hwpt_invalidate_selftest, to allow to test IOMMU_HWPT_INVALIDATE
from user space, by using the new IOMMU_TEST_OP_MD_CHECK_IOTLB.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/iommu/iommufd/iommufd_test.h | 10 ++++++++++
drivers/iommu/iommufd/selftest.c | 19 ++++++++++++++++++
tools/testing/selftests/iommu/iommufd.c | 8 ++++++++
tools/testing/selftests/iommu/iommufd_utils.h | 20 +++++++++++++++++++
4 files changed, 57 insertions(+)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index ec904931df69..c5ca69bd07d1 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -129,4 +129,14 @@ struct iommu_hwpt_selftest {
__u64 test_config;
};

+/**
+ * struct iommu_hwpt_invalidate_selftest
+ *
+ * @flags: invalidate flags
+ */
+struct iommu_hwpt_invalidate_selftest {
+#define IOMMU_TEST_INVALIDATE_ALL (1ULL << 0)
+ __u64 flags;
+};
+
#endif
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 57530e7d9524..3c0051442b4d 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -362,9 +362,28 @@ static const struct iommu_ops mock_ops = {
},
};

+static int mock_domain_cache_invalidate_user(struct iommu_domain *domain,
+ void *user_data)
+{
+ struct iommu_hwpt_invalidate_selftest *inv_info = user_data;
+ struct mock_iommu_domain *mock =
+ container_of(domain, struct mock_iommu_domain, domain);
+
+ if (domain->type != IOMMU_DOMAIN_NESTED || !mock->parent)
+ return -EINVAL;
+
+ if (inv_info->flags & IOMMU_TEST_INVALIDATE_ALL)
+ mock->iotlb = 0;
+
+ return 0;
+}
+
static struct iommu_domain_ops domain_nested_ops = {
.free = mock_domain_free,
.attach_dev = mock_domain_nop_attach,
+ .cache_invalidate_user = mock_domain_cache_invalidate_user,
+ .cache_invalidate_user_data_len =
+ sizeof(struct iommu_hwpt_invalidate_selftest),
};

static struct iommu_device mock_iommu_device = {
diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index afbe23cecb54..031e222cebf9 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -123,6 +123,7 @@ TEST_F(iommufd, cmd_length)
TEST_LENGTH(iommu_vfio_ioas, IOMMU_VFIO_IOAS);
TEST_LENGTH(iommu_hw_info, IOMMU_DEVICE_GET_HW_INFO);
TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC);
+ TEST_LENGTH(iommu_hwpt_invalidate, IOMMU_HWPT_INVALIDATE);
#undef TEST_LENGTH
}

@@ -323,6 +324,13 @@ TEST_F(iommufd_ioas, nested_hwpt_alloc)
EXPECT_ERRNO(EBUSY,
_test_ioctl_destroy(self->fd, parent_hwpt_id));

+ /* hwpt_invalidate only supports a user-managed hwpt (nested) */
+ test_err_cmd_hwpt_invalidate(EINVAL, parent_hwpt_id);
+ test_cmd_hwpt_invalidate(nested_hwpt_id[0]);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[0], 0);
+ test_cmd_hwpt_invalidate(nested_hwpt_id[1]);
+ test_cmd_hwpt_check_iotlb(nested_hwpt_id[1], 0);
+
/* Attach device to nested_hwpt_id[0] that then will be busy */
test_cmd_mock_domain_replace(self->stdev_id,
nested_hwpt_id[0]);
diff --git a/tools/testing/selftests/iommu/iommufd_utils.h b/tools/testing/selftests/iommu/iommufd_utils.h
index 7d9efe3f7e0d..fef17fb46160 100644
--- a/tools/testing/selftests/iommu/iommufd_utils.h
+++ b/tools/testing/selftests/iommu/iommufd_utils.h
@@ -169,6 +169,26 @@ static int _test_cmd_hwpt_alloc_nested(int fd, __u32 device_id, __u32 parent_id,
_test_cmd_hwpt_alloc_nested(self->fd, device_id, \
parent_id, hwpt_id))

+static int _test_cmd_hwpt_invalidate(int fd, __u32 hwpt_id)
+{
+ struct iommu_hwpt_invalidate_selftest data = {
+ .flags = IOMMU_TEST_INVALIDATE_ALL,
+ };
+ struct iommu_hwpt_invalidate cmd = {
+ .size = sizeof(cmd),
+ .hwpt_id = hwpt_id,
+ .data_len = sizeof(data),
+ .data_uptr = (uint64_t)&data,
+ };
+
+ return ioctl(fd, IOMMU_HWPT_INVALIDATE, &cmd);
+}
+
+#define test_cmd_hwpt_invalidate(hwpt_id) \
+ ASSERT_EQ(0, _test_cmd_hwpt_invalidate(self->fd, hwpt_id))
+#define test_err_cmd_hwpt_invalidate(_errno, hwpt_id) \
+ EXPECT_ERRNO(_errno, _test_cmd_hwpt_invalidate(self->fd, hwpt_id))
+
static int _test_cmd_access_replace_ioas(int fd, __u32 access_id,
unsigned int ioas_id)
{
--
2.34.1