Re: [PATCH i-g-t 1/4] tests/intel/xe_sriov_vfio: Add module load/unload subtests

["Bernatowicz, Marcin" <marcin.bernatowicz@linux.intel.com>]

On 3/24/2026 2:54 PM, Laguna, Lukasz wrote:
>
> On 3/18/2026 17:14, Marcin Bernatowicz wrote:
>> Introduce subtests that verify xe_vfio_pci can be loaded and unloaded,
>> while reporting already-loaded or already-unloaded initial state as
>> success. The unload path still skips when xe-vfio-pci has bound devices,
>> to avoid attempting removal while the driver is in use.
>>
>> Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
>> Cc: Adam Miszczak <adam.miszczak@linux.intel.com>
>> Cc: Jakub Kolakowski <jakub1.kolakowski@intel.com>
>> Cc: Kamil Konieczny <kamil.konieczny@linux.intel.com>
>> Cc: Lukasz Laguna <lukasz.laguna@intel.com>
>> ---
>>   tests/intel/xe_sriov_vfio.c | 88 +++++++++++++++++++++++++++++++++++++
>>   tests/meson.build           |  1 +
>>   2 files changed, 89 insertions(+)
>>   create mode 100644 tests/intel/xe_sriov_vfio.c
>>
>> diff --git a/tests/intel/xe_sriov_vfio.c b/tests/intel/xe_sriov_vfio.c
>> new file mode 100644
>> index 000000000..2fe0137e1
>> --- /dev/null
>> +++ b/tests/intel/xe_sriov_vfio.c
>> @@ -0,0 +1,88 @@
>> +// SPDX-License-Identifier: MIT
>> +/*
>> + * Copyright(c) 2026 Intel Corporation. All rights reserved.
>> + */
>> +
>> +#include <ctype.h>
>> +#include <dirent.h>
>> +
>> +#include "igt_core.h"
>> +#include "igt_kmod.h"
>> +
>> +/**
>> + * TEST: xe_sriov_vfio
>> + * Category: Core
>> + * Mega feature: SR-IOV
>> + * Sub-category: SR-IOV VFIO
>> + * Functionality: VFIO module
>> + * Description: Verify basic xe-vfio-pci module operations.
>> + *
>> + * SUBTEST: load-xe-vfio-pci
>> + * Description: Attempt to load xe_vfio_pci module.
>> + *
>> + * SUBTEST: unload-xe-vfio-pci
>> + * Description: Attempt to unload xe_vfio_pci module (skips if busy).
>> + */
>> +
>> +IGT_TEST_DESCRIPTION("Xe SR-IOV VFIO tests (xe-vfio-pci)");
>> +
>> +static const char *XE_VFIO_PCI_MOD = "xe_vfio_pci";
>> +static const char *XE_VFIO_PCI_DRV = "xe-vfio-pci";
>> +
>> +static bool pci_driver_has_any_bound_devices(const char *driver)
>> +{
>> +    char path[PATH_MAX];
>> +    DIR *dir;
>> +    struct dirent *de;
>> +
>> +    snprintf(path, sizeof(path), "/sys/bus/pci/drivers/%s", driver);
>> +    dir = opendir(path);
>> +    if (!dir)
>> +        return false;
>> +
>> +    while ((de = readdir(dir))) {
>> +        if (de->d_type != DT_LNK)
>> +            continue;
>> +        if (!isdigit(de->d_name[0]))
>> +            continue;
>> +
>> +        closedir(dir);
>> +        return true;
>> +    }
>> +
>> +    closedir(dir);
>> +    return false;
>> +}
>> +
>> +int igt_main()
>> +{
>> +    igt_describe("Attempt to load xe_vfio_pci module.");
>> +    igt_subtest("load-xe-vfio-pci") {
>> +        int ret;
>> +
>> +        if (igt_kmod_is_loaded(XE_VFIO_PCI_MOD))
>> +            igt_info("%s already loaded\n", XE_VFIO_PCI_MOD);
>
> I think it would be better to skip in such case.

This may be problematic in CI and depends on tests execution order and 
configuration.

> And igt_kmod_load will print "Module %s already inserted\n", so this 
> info seems to be redundant anyway.
igt_kmod_load does not print that info if no options are passed, which 
is our case.
>
>
>> +
>> +        ret = igt_kmod_load(XE_VFIO_PCI_MOD, NULL);
>> +        igt_assert_f(ret == 0, "Failed to load %s (%d)\n", 
>> XE_VFIO_PCI_MOD, ret);
>> +        igt_assert(igt_kmod_is_loaded(XE_VFIO_PCI_MOD));
>> +    }
>> +
>> +    igt_describe("Attempt to unload xe_vfio_pci module (skips if 
>> busy).");
>> +    igt_subtest("unload-xe-vfio-pci") {
>> +        int ret;
>> +
>> +        if (!igt_kmod_is_loaded(XE_VFIO_PCI_MOD)) {
>> +            igt_info("%s already unloaded\n", XE_VFIO_PCI_MOD);
>> +            igt_success();
>
> Maybe it would be better to have one subtest "xe-vfio-pci-load-unload" ?

If we do not need load/unload tests leaving the driver loaded/unloaded 
then we can do this

and simplify some other parts.

>> +        }
>> +
>> +        if (pci_driver_has_any_bound_devices(XE_VFIO_PCI_DRV))
>> +            igt_skip("%s has bound devices; not attempting 
>> unload\n", XE_VFIO_PCI_DRV);
>> +
>> +        ret = igt_kmod_unload(XE_VFIO_PCI_MOD);
>> +        igt_assert_f(ret == 0, "Failed to unload %s (%d)\n", 
>> XE_VFIO_PCI_MOD, ret);
>> +        igt_assert_f(!igt_kmod_is_loaded(XE_VFIO_PCI_MOD), "%s still 
>> loaded\n",
>> +                 XE_VFIO_PCI_MOD);
>> +    }
>> +}
>> diff --git a/tests/meson.build b/tests/meson.build
>> index cecb4a8ae..26d9345ec 100644
>> --- a/tests/meson.build
>> +++ b/tests/meson.build
>> @@ -337,6 +337,7 @@ intel_xe_progs = [
>>       'xe_sriov_admin',
>>       'xe_sriov_auto_provisioning',
>>       'xe_sriov_flr',
>> +    'xe_sriov_vfio',
>>       'xe_sriov_scheduling',
>>           'xe_survivability',
>>       'xe_sriov_vram',