Re: [PATCH v4 4/4] iommufd/selftest: Add coverage for IOMMU_GET_HW_INFO ioctl

[Nicolin Chen <nicolinc@nvidia.com>]

Hi Kevin,

On Thu, Jul 27, 2023 at 08:14:45AM +0000, Tian, Kevin wrote:
 
> > From: Liu, Yi L <yi.l.liu@intel.com>
> > Sent: Monday, July 24, 2023 7:00 PM
> >
> > --- a/drivers/iommu/iommufd/device.c
> > +++ b/drivers/iommu/iommufd/device.c
> > @@ -8,6 +8,7 @@
> >
> >  #include "io_pagetable.h"
> >  #include "iommufd_private.h"
> > +#include "iommufd_test.h"
> 
> Is it stale?

Ah, should've dropped it.

> > @@ -211,7 +213,7 @@ 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, NULL);
> > +                                  &self->hwpt_id, &self->device_id);
> >               self->base_iova = MOCK_APERTURE_START;
> >       }
> >  }
> > @@ -290,6 +292,19 @@ TEST_F(iommufd_ioas, ioas_area_auto_destroy)
> >       }
> >  }
> >
> > +TEST_F(iommufd_ioas, get_hw_info)
> > +{
> > +     struct iommu_test_hw_info info;
> > +
> > +     if (self->device_id) {
> > +             test_cmd_get_hw_info(self->device_id, sizeof(info), &info);
> > +             assert(info.test_reg ==
> > IOMMU_HW_INFO_SELFTEST_REGVAL);
> > +     } else {
> > +             test_err_get_hw_info(ENOENT, self->device_id,
> > +                                  sizeof(info), &info);
> > +     }
> 
> If self->device_id is invalid it should be reported right after
> test_cmd_mock_domain()?

A device_id is created per mock_domain. And mock_domain is a
variant that could be 0, so a device_id being 0 could be a
normal case. Here the invalid test is for negative coverage.

Thanks!
Nic