[PATCH v1 10/16] iommufd/selftest: Add mock_viommu_invalidate_user op

[Nicolin Chen]

Similar to the coverage of cache_invalidate_user for iotlb invalidation,
add a device cache and an invalidation op to test IOMMU_VIOMMU_INVALIDATE
ioctl.

Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
---
 drivers/iommu/iommufd/iommufd_test.h | 25 +++++++++++
 drivers/iommu/iommufd/selftest.c     | 63 +++++++++++++++++++++++++++-
 2 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/iommufd/iommufd_test.h b/drivers/iommu/iommufd/iommufd_test.h
index 0bb30275a92f..da824b58927f 100644
--- a/drivers/iommu/iommufd/iommufd_test.h
+++ b/drivers/iommu/iommufd/iommufd_test.h
@@ -55,6 +55,11 @@ enum {
 	MOCK_NESTED_DOMAIN_IOTLB_NUM = 4,
 };
 
+enum {
+	MOCK_DEV_CACHE_ID_MAX = 3,
+	MOCK_DEV_CACHE_NUM = 4,
+};
+
 struct iommu_test_cmd {
 	__u32 size;
 	__u32 op;
@@ -156,6 +161,7 @@ struct iommu_test_hw_info {
 /* Should not be equal to any defined value in enum iommu_hwpt_data_type */
 #define IOMMU_HWPT_DATA_SELFTEST 0xdead
 #define IOMMU_TEST_IOTLB_DEFAULT 0xbadbeef
+#define IOMMU_TEST_DEV_CACHE_DEFAULT 0xbaddad
 
 /**
  * struct iommu_hwpt_selftest
@@ -184,4 +190,23 @@ struct iommu_hwpt_invalidate_selftest {
 	__u32 iotlb_id;
 };
 
+/* Should not be equal to any defined value in enum iommu_viommu_invalidate_data_type */
+#define IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST 0xdeadbeef
+#define IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST_INVALID 0xdadbeef
+
+/**
+ * struct iommu_viommu_invalidate_selftest - Invalidation data for Mock VIOMMU
+ *                                        (IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST)
+ * @flags: Invalidate flags
+ * @cache_id: Invalidate cache entry index
+ *
+ * If IOMMU_TEST_INVALIDATE_ALL is set in @flags, @cache_id will be ignored
+ */
+struct iommu_viommu_invalidate_selftest {
+#define IOMMU_TEST_INVALIDATE_FLAG_ALL	(1 << 0)
+	__u32 flags;
+	__u32 vdev_id;
+	__u32 cache_id;
+};
+
 #endif
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index a165b162c88f..4858c74c67be 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -141,6 +141,7 @@ struct mock_dev {
 	struct device dev;
 	unsigned long flags;
 	int id;
+	u32 cache[MOCK_DEV_CACHE_NUM];
 };
 
 struct selftest_obj {
@@ -560,6 +561,61 @@ static void mock_dev_get_resv_regions(struct device *dev,
 	iommu_dma_get_resv_regions(dev, head);
 }
 
+static int mock_viommu_cache_invalidate(struct iommufd_viommu *viommu,
+					struct iommu_user_data_array *array)
+{
+	struct iommu_viommu_invalidate_selftest inv;
+	u32 processed = 0;
+	int i = 0, j;
+	int rc = 0;
+
+	if (array->type != IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	for ( ; i < array->entry_num; i++) {
+		struct mock_dev *mdev;
+		struct device *dev;
+
+		rc = iommu_copy_struct_from_user_array(&inv, array,
+			IOMMU_VIOMMU_INVALIDATE_DATA_SELFTEST, i, cache_id);
+		if (rc)
+			break;
+
+		if (inv.flags & ~IOMMU_TEST_INVALIDATE_FLAG_ALL) {
+			rc = -EOPNOTSUPP;
+			break;
+		}
+
+		if (inv.cache_id > MOCK_DEV_CACHE_ID_MAX) {
+			rc = -EINVAL;
+			break;
+		}
+
+		dev = iommufd_viommu_find_device(viommu, inv.vdev_id);
+		if (!dev) {
+			rc = -EINVAL;
+			break;
+		}
+		mdev = container_of(dev, struct mock_dev, dev);
+
+		if (inv.flags & IOMMU_TEST_INVALIDATE_FLAG_ALL) {
+			/* Invalidate all cache entries and ignore cache_id */
+			for (j = 0; j < MOCK_DEV_CACHE_NUM; j++)
+				mdev->cache[j] = 0;
+		} else {
+			mdev->cache[inv.cache_id] = 0;
+		}
+
+		processed++;
+	}
+
+out:
+	array->entry_num = processed;
+	return rc;
+}
+
 static const struct iommu_ops mock_ops = {
 	/*
 	 * IOMMU_DOMAIN_BLOCKED cannot be returned from def_domain_type()
@@ -587,6 +643,9 @@ static const struct iommu_ops mock_ops = {
 			.map_pages = mock_domain_map_pages,
 			.unmap_pages = mock_domain_unmap_pages,
 			.iova_to_phys = mock_domain_iova_to_phys,
+			.default_viommu_ops = &(struct iommufd_viommu_ops){
+				.cache_invalidate = mock_viommu_cache_invalidate,
+			},
 		},
 };
 
@@ -722,7 +781,7 @@ static void mock_dev_release(struct device *dev)
 static struct mock_dev *mock_dev_create(unsigned long dev_flags)
 {
 	struct mock_dev *mdev;
-	int rc;
+	int rc, i;
 
 	if (dev_flags &
 	    ~(MOCK_FLAGS_DEVICE_NO_DIRTY | MOCK_FLAGS_DEVICE_HUGE_IOVA))
@@ -737,6 +796,8 @@ static struct mock_dev *mock_dev_create(unsigned long dev_flags)
 	mdev->flags = dev_flags;
 	mdev->dev.release = mock_dev_release;
 	mdev->dev.bus = &iommufd_mock_bus_type.bus;
+	for (i = 0; i < MOCK_DEV_CACHE_NUM; i++)
+		mdev->cache[i] = IOMMU_TEST_DEV_CACHE_DEFAULT;
 
 	rc = ida_alloc(&mock_dev_ida, GFP_KERNEL);
 	if (rc < 0)
-- 
2.43.0