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iommufd/selftest: Support user_data in mock_viommu_alloc

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Add a simple user_data for an input-to-output loopback test.

Link: https://patch.msgid.link/r/cae4632bb3d98a1efb3b77488fbf81814f2041c6.1752126748.git.nicolinc@nvidia.com
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2025-07-09 22:59:00 -07:00 committed by Jason Gunthorpe
parent 1976cdf61c
commit afeaf592c1
2 changed files with 28 additions and 0 deletions
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13
drivers/iommu/iommufd/iommufd_test.h
View File

@ -227,6 +227,19 @@ struct iommu_hwpt_invalidate_selftest {
#define IOMMU_VIOMMU_TYPE_SELFTEST 0xdeadbeef
/**
* struct iommu_viommu_selftest - vIOMMU data for Mock driver
* (IOMMU_VIOMMU_TYPE_SELFTEST)
* @in_data: Input random data from user space
* @out_data: Output data (matching @in_data) to user space
*
* Simply set @out_data=@in_data for a loopback test
*/
struct iommu_viommu_selftest {
__u32 in_data;
__u32 out_data;
};
/* 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

15
drivers/iommu/iommufd/selftest.c
View File

@ -784,6 +784,21 @@ static int mock_viommu_init(struct iommufd_viommu *viommu,
{
struct mock_iommu_device *mock_iommu = container_of(
viommu->iommu_dev, struct mock_iommu_device, iommu_dev);
struct iommu_viommu_selftest data;
int rc;
if (user_data) {
rc = iommu_copy_struct_from_user(
&data, user_data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
if (rc)
return rc;
data.out_data = data.in_data;
rc = iommu_copy_struct_to_user(
user_data, &data, IOMMU_VIOMMU_TYPE_SELFTEST, out_data);
if (rc)
return rc;
}
refcount_inc(&mock_iommu->users);
viommu->ops = &mock_viommu_ops;