iommufd/selftest: Add IOMMU_TEST_OP_DEV_CHECK_CACHE test command

Similar to IOMMU_TEST_OP_MD_CHECK_IOTLB verifying a mock_domain's iotlb,
IOMMU_TEST_OP_DEV_CHECK_CACHE will be used to verify a mock_dev's cache.

Link: https://patch.msgid.link/r/cd4082079d75427bd67ed90c3c825e15b5720a5f.1730836308.git.nicolinc@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Author: nicolinc

drivers/iommu/iommufd/iommufd_test.h

@@ -23,6 +23,7 @@ enum {
 	IOMMU_TEST_OP_DIRTY,
 	IOMMU_TEST_OP_MD_CHECK_IOTLB,
 	IOMMU_TEST_OP_TRIGGER_IOPF,
+	IOMMU_TEST_OP_DEV_CHECK_CACHE,
 };
 
 enum {
@@ -140,6 +141,10 @@ struct iommu_test_cmd {
 			__u32 perm;
 			__u64 addr;
 		} trigger_iopf;
+		struct {
+			__u32 id;
+			__u32 cache;
+		} check_dev_cache;
 	};
 	__u32 last;
 };

drivers/iommu/iommufd/selftest.c

@@ -1125,6 +1125,24 @@ static int iommufd_test_md_check_iotlb(struct iommufd_ucmd *ucmd,
 	return rc;
 }
 
+static int iommufd_test_dev_check_cache(struct iommufd_ucmd *ucmd, u32 idev_id,
+					unsigned int cache_id, u32 cache)
+{
+	struct iommufd_device *idev;
+	struct mock_dev *mdev;
+	int rc = 0;
+
+	idev = iommufd_get_device(ucmd, idev_id);
+	if (IS_ERR(idev))
+		return PTR_ERR(idev);
+	mdev = container_of(idev->dev, struct mock_dev, dev);
+
+	if (cache_id > MOCK_DEV_CACHE_ID_MAX || mdev->cache[cache_id] != cache)
+		rc = -EINVAL;
+	iommufd_put_object(ucmd->ictx, &idev->obj);
+	return rc;
+}
+
 struct selftest_access {
 	struct iommufd_access *access;
 	struct file *file;
@@ -1634,6 +1652,10 @@ int iommufd_test(struct iommufd_ucmd *ucmd)
 		return iommufd_test_md_check_iotlb(ucmd, cmd->id,
 						   cmd->check_iotlb.id,
 						   cmd->check_iotlb.iotlb);
+	case IOMMU_TEST_OP_DEV_CHECK_CACHE:
+		return iommufd_test_dev_check_cache(ucmd, cmd->id,
+						    cmd->check_dev_cache.id,
+						    cmd->check_dev_cache.cache);
 	case IOMMU_TEST_OP_CREATE_ACCESS:
 		return iommufd_test_create_access(ucmd, cmd->id,
 						  cmd->create_access.flags);

tools/testing/selftests/iommu/iommufd.c

@@ -227,6 +227,8 @@ FIXTURE_SETUP(iommufd_ioas)
 	for (i = 0; i != variant->mock_domains; i++) {
 		test_cmd_mock_domain(self->ioas_id, &self->stdev_id,
 				     &self->hwpt_id, &self->device_id);
+		test_cmd_dev_check_cache_all(self->device_id,
+					     IOMMU_TEST_DEV_CACHE_DEFAULT);
 		self->base_iova = MOCK_APERTURE_START;
 	}
 }
@@ -1392,9 +1394,12 @@ FIXTURE_SETUP(iommufd_mock_domain)
 
 	ASSERT_GE(ARRAY_SIZE(self->hwpt_ids), variant->mock_domains);
 
-	for (i = 0; i != variant->mock_domains; i++)
+	for (i = 0; i != variant->mock_domains; i++) {
 		test_cmd_mock_domain(self->ioas_id, &self->stdev_ids[i],
 				     &self->hwpt_ids[i], &self->idev_ids[i]);
+		test_cmd_dev_check_cache_all(self->idev_ids[0],
+					     IOMMU_TEST_DEV_CACHE_DEFAULT);
+	}
 	self->hwpt_id = self->hwpt_ids[0];
 
 	self->mmap_flags = MAP_SHARED | MAP_ANONYMOUS;

tools/testing/selftests/iommu/iommufd_utils.h

@@ -250,6 +250,30 @@ static int _test_cmd_hwpt_alloc(int fd, __u32 device_id, __u32 pt_id, __u32 ft_i
 			test_cmd_hwpt_check_iotlb(hwpt_id, i, expected);       \
 	})
 
+#define test_cmd_dev_check_cache(device_id, cache_id, expected)                \
+	({                                                                     \
+		struct iommu_test_cmd test_cmd = {                             \
+			.size = sizeof(test_cmd),                              \
+			.op = IOMMU_TEST_OP_DEV_CHECK_CACHE,                   \
+			.id = device_id,                                       \
+			.check_dev_cache = {                                   \
+				.id = cache_id,                                \
+				.cache = expected,                             \
+			},                                                     \
+		};                                                             \
+		ASSERT_EQ(0, ioctl(self->fd,                                   \
+				   _IOMMU_TEST_CMD(                            \
+					   IOMMU_TEST_OP_DEV_CHECK_CACHE),     \
+				   &test_cmd));                                \
+	})
+
+#define test_cmd_dev_check_cache_all(device_id, expected)                      \
+	({                                                                     \
+		int c;                                                         \
+		for (c = 0; c < MOCK_DEV_CACHE_NUM; c++)                       \
+			test_cmd_dev_check_cache(device_id, c, expected);      \
+	})
+
 static int _test_cmd_hwpt_invalidate(int fd, __u32 hwpt_id, void *reqs,
 				     uint32_t data_type, uint32_t lreq,
 				     uint32_t *nreqs)