Re: [Intel-gfx] [PATCH i-g-t v3] tests/gem_lmem_swapping: limit lmem to 4G

[Petri Latvala <petri.latvala@intel.com>]

On Mon, Mar 28, 2022 at 11:08:59AM +0100, Matthew Auld wrote:
> From: CQ Tang <cq.tang@intel.com>
> 
> On some systems lmem can be as large as 16G, which seems to trigger
> various CI timeouts, and in the best case just takes a long time. For
> the purposes of the test we should be able to limit to 4G, without any
> big loss in coverage.
> 
> v2:
>  - No need to try again without the modparam; if it's not supported it
>    will still load the driver just fine.
> v3(Petri):
>  - Add a helpful debug print in case the kernel is missing support for
>    the lmem_size modparam.
> 
> Signed-off-by: CQ Tang <cq.tang@intel.com>
> Signed-off-by: Matthew Auld <matthew.auld@intel.com>
> Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Cc: Nirmoy Das <nirmoy.das@linux.intel.com>
> Cc: Petri Latvala <petri.latvala@intel.com>
> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
> Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
> ---
>  tests/i915/gem_lmem_swapping.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/i915/gem_lmem_swapping.c b/tests/i915/gem_lmem_swapping.c
> index 31644bcd..6cf1acec 100644
> --- a/tests/i915/gem_lmem_swapping.c
> +++ b/tests/i915/gem_lmem_swapping.c
> @@ -526,11 +526,20 @@ igt_main_args("", long_options, help_str, opt_handler, NULL)
>  
>  	igt_fixture {
>  		struct intel_execution_engine2 *e;
> +		char *tmp;
>  
> -		i915 = drm_open_driver(DRIVER_INTEL);
> +		igt_i915_driver_unload();
> +		igt_assert_eq(igt_i915_driver_load("lmem_size=4096"), 0);
> +
> +		i915 = __drm_open_driver(DRIVER_INTEL);
>  		igt_require_gem(i915);
>  		igt_require(gem_has_lmem(i915));
>  
> +		tmp = __igt_params_get(i915, "lmem_size");
> +		if (!tmp)
> +			igt_info("lmem_size modparam not supported on this kernel. Continuing with full lmem size. This may result in CI timeouts.");
> +		free(tmp);

Newline at the end missing. With that added,
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

> +
>  		regions = gem_get_query_memory_regions(i915);
>  		igt_require(regions);
>  
> @@ -556,6 +565,7 @@ igt_main_args("", long_options, help_str, opt_handler, NULL)
>  		intel_ctx_destroy(i915, ctx);
>  		free(regions);
>  		close(i915);
> +		igt_i915_driver_unload();
>  	}
>  
>  	igt_exit();
> -- 
> 2.34.1
>