[PATCH i-g-t 4/5] tests/intel/xe_fault_injection: Inject errors during vm create IOCTL

[Rodrigo Vivi]

On Fri, Nov 08, 2024 at 04:59:32PM +0100, Francois Dugast wrote:
> Use the fault injection infrastructure to make targeted internal KMD
> functions fail when executing xe_vm_create_ioctl() so that more code
> paths are tested, such as error handling and unwinding.
> 

Reviewed-by: Rodrigo Vivi <rodrigo.vivi at intel.com>

> Signed-off-by: Francois Dugast <francois.dugast at intel.com>
> ---
>  tests/intel/xe_fault_injection.c | 55 ++++++++++++++++++++++++++++++--
>  1 file changed, 53 insertions(+), 2 deletions(-)
> 
> diff --git a/tests/intel/xe_fault_injection.c b/tests/intel/xe_fault_injection.c
> index 87e567a54..eb80f6af8 100644
> --- a/tests/intel/xe_fault_injection.c
> +++ b/tests/intel/xe_fault_injection.c
> @@ -17,6 +17,8 @@
>  #include "igt_device.h"
>  #include "igt_kmod.h"
>  #include "igt_sysfs.h"
> +#include "xe/xe_ioctl.h"
> +#include "xe/xe_query.h"
>  
>  #define INJECT_ERRNO			-ENOMEM
>  
> @@ -154,13 +156,47 @@ inject_fault_probe(int fd, char pci_slot[], const char function_name[])
>  	injection_list_do(INJECTION_LIST_REMOVE, function_name);
>  }
>  
> +static int
> +simple_vm_create(int fd, unsigned int flags)
> +{
> +	struct drm_xe_vm_create create = {
> +		.flags = flags,
> +	};
> +
> +	return igt_ioctl(fd, DRM_IOCTL_XE_VM_CREATE, &create);
> +}
> +
> +/**
> + * SUBTEST: vm-create-fail-%s
> + * Description: inject an error in function %arg[1] used in vm create IOCTL to make it fail
> + * Functionality: fault
> + *
> + * arg[1]:
> + * @xe_pt_create:		xe_pt_create
> + * @xe_exec_queue_create_bind:	xe_exec_queue_create_bind
> + * @xe_vm_create_scratch:	xe_vm_create_scratch
> + */
> +static void
> +vm_create_fail(int fd, const char function_name[], unsigned int flags)
> +{
> +	igt_assert_eq(simple_vm_create(fd, flags), 0);
> +
> +	injection_list_do(INJECTION_LIST_ADD, function_name);
> +	set_retval(function_name, INJECT_ERRNO);
> +	igt_assert(simple_vm_create(fd, flags) != 0);
> +	injection_list_do(INJECTION_LIST_REMOVE, function_name);
> +
> +	igt_assert_eq(simple_vm_create(fd, flags), 0);
> +}
> +
>  igt_main
>  {
>  	int fd;
>  	char pci_slot[NAME_MAX];
>  	const struct section {
>  		const char *name;
> -	} probe_function_sections[] = {
> +		unsigned int flags;
> +	} probe_fail_functions[] = {
>  		{ "wait_for_lmem_ready" },
>  		{ "xe_device_create" },
>  		{ "xe_ggtt_init_early" },
> @@ -176,16 +212,29 @@ igt_main
>  		{ "xe_sriov_init" },
>  		{ }
>  	};
> +	const struct section vm_create_fail_functions[] = {
> +		{ "xe_pt_create", 0 },
> +		{ "xe_exec_queue_create_bind", 0 },
> +		{ "xe_vm_create_scratch", DRM_XE_VM_CREATE_FLAG_SCRATCH_PAGE },
> +		{ }
> +	};
>  
>  	igt_fixture {
>  		igt_require(fail_function_injection_enabled());
>  		fd = drm_open_driver(DRIVER_XE);
>  		igt_device_get_pci_slot_name(fd, pci_slot);
>  		setup_injection_fault();
> +	}
> +
> +	for (const struct section *s = vm_create_fail_functions; s->name; s++)
> +		igt_subtest_f("vm-create-fail-%s", s->name)
> +			vm_create_fail(fd, s->name, s->flags);
> +
> +	igt_fixture {
>  		xe_sysfs_driver_do(fd, pci_slot, XE_SYSFS_DRIVER_UNBIND);
>  	}
>  
> -	for (const struct section *s = probe_function_sections; s->name; s++)
> +	for (const struct section *s = probe_fail_functions; s->name; s++)
>  		igt_subtest_f("inject-fault-probe-function-%s", s->name)
>  			inject_fault_probe(fd, pci_slot, s->name);
>  
> @@ -193,4 +242,6 @@ igt_main
>  		drm_close_driver(fd);
>  		xe_sysfs_driver_do(fd, pci_slot, XE_SYSFS_DRIVER_BIND);
>  	}
> +
> +
>  }
> -- 
> 2.43.0
>