[igt-dev] [PATCH] tests/i915/i915_module_load: Test resizable bar support

[Kamil Konieczny]

Hi Priyanka,

On 2022-06-16 at 17:35:58 +0530, priyanka.dandamudi at intel.com wrote:
> From: Priyanka Dandamudi <priyanka.dandamudi at intel.com>
> 
> New test named resize bar has been added which tests whether
> bar gets resized with different supported sizes.
> 
> v2: Added code to check for bad bar sizes.
> Modified code to check for support of lmem_bar_size modparam.(Petri)
> 
> Note:Test gets executed when
> 1. modparam lmem_bar_size gets added.
> 2. small bar bits gets enabled.
> 
> Cc: Matthew Auld <matthew.auld at intel.com>
> Signed-off-by: Priyanka Dandamudi <priyanka.dandamudi at intel.com>
> ---
>  tests/i915/i915_module_load.c | 89 +++++++++++++++++++++++++++++++++++
>  1 file changed, 89 insertions(+)
> 
> diff --git a/tests/i915/i915_module_load.c b/tests/i915/i915_module_load.c
> index f5f98acc2..5a653711b 100644
> --- a/tests/i915/i915_module_load.c
> +++ b/tests/i915/i915_module_load.c
> @@ -31,12 +31,17 @@
>  #include <fcntl.h>
>  
>  #include "i915/gem_create.h"
> +#include "i915/gem.h"
>  #include "igt_debugfs.h"
>  #include "igt_aux.h"
>  #include "igt_kmod.h"
>  #include "igt_sysfs.h"
>  #include "igt_core.h"
>  
> +#define BAR_SIZE_SHIFT 20
> +#define MIN_BAR_SIZE 256
> +#define BYTE 1024
> +
>  IGT_TEST_DESCRIPTION("Tests the i915 module loading.");
>  
>  static void store_all(int i915)
> @@ -236,6 +241,48 @@ hda_dynamic_debug(bool enable)
>  	fclose(fp);
>  }
>  
> +static uint32_t  driver_load_unload(uint32_t lmem_bar_size, bool check_support)
> +{
> +	struct drm_i915_query_memory_regions *regions;
> +	struct drm_i915_memory_region_info *region;
> +	int i915 = -1;
> +	char lmem_bar[64];
> +
> +	igt_i915_driver_unload();
> +	if (lmem_bar_size == 0)
> +		igt_assert_eq(igt_i915_driver_load(NULL), 0);
> +	else {
> +		sprintf(lmem_bar, "lmem_bar_size=%u", lmem_bar_size);
> +		igt_assert_eq(igt_i915_driver_load(lmem_bar), 0);
> +	}
> +
> +	i915 = __drm_open_driver(DRIVER_INTEL);
> +	igt_require_fd(i915);
> +	igt_require_gem(i915);
> +	igt_require(gem_has_lmem(i915));
> +
> +	if (check_support) {
> +		char *tmp;
> +
> +		tmp = __igt_params_get(i915, "lmem_bar_size");
> +		if (!tmp)
> +			igt_skip("lmem_bar_size modparam not supported on this kernel."
> +					"Skipping the test.");
> +		free(tmp);
> +	}
> +
> +	regions = gem_get_query_memory_regions(i915);
> +	igt_require(regions);
> +
> +	for (unsigned int i = 0; i < (regions)->num_regions; i++)
> +		for_each_if(((region) = &(regions)->regions[i])->region.memory_class ==
> +				I915_MEMORY_CLASS_DEVICE)
> +			lmem_bar_size = (region->rsvd1[0] >> BAR_SIZE_SHIFT);
> +	close(i915);
> +
> +	return lmem_bar_size;
> +}
> +
>  igt_main
>  {
>  	igt_describe("Verify the basic functionality of i915 driver after it's reloaded.");
> @@ -285,6 +332,48 @@ igt_main
>  
>  		/* inject_fault() leaves the module unloaded */
>  	}

Please add newline here and also add description to each new
test you add.

Regards,
Kamil

> +	igt_subtest("resize-bar") {
> +		uint32_t result_bar_size;
> +		uint32_t lmem_bar_size;
> +		int i915 = -1;
> +
> +		if (igt_kmod_is_loaded("i915")) {
> +			i915 = __drm_open_driver(DRIVER_INTEL);
> +			igt_require_fd(i915);
> +			igt_require_gem(i915);
> +			igt_require(gem_has_lmem(i915));
> +			close(i915);
> +		}
> +
> +		/* Test for lmem_bar_size modparam support */
> +		lmem_bar_size = driver_load_unload(MIN_BAR_SIZE, true);
> +		igt_assert_eq(lmem_bar_size, MIN_BAR_SIZE);
> +
> +		lmem_bar_size = driver_load_unload(0, false);
> +
> +		lmem_bar_size = ceil((float)(lmem_bar_size)/BYTE)*BYTE;
> +
> +		igt_skip_on_f(lmem_bar_size == MIN_BAR_SIZE, "Bar is already set to minimum size.");
> +
> +		while (lmem_bar_size > MIN_BAR_SIZE) {
> +			lmem_bar_size = lmem_bar_size >> 1;
> +
> +			result_bar_size = driver_load_unload(lmem_bar_size, false);
> +
> +			igt_assert_f(lmem_bar_size == result_bar_size, "Bar couldn't be resized.");
> +		}
> +
> +		/* Test with unsupported sizes */
> +		lmem_bar_size = 80;
> +		result_bar_size = driver_load_unload(lmem_bar_size, false);
> +		igt_assert_f(lmem_bar_size != result_bar_size, "Bar resized to unsupported size.");
> +
> +		lmem_bar_size = 16400;
> +		result_bar_size = driver_load_unload(lmem_bar_size, false);
> +		igt_assert_f(lmem_bar_size != result_bar_size, "Bar resized to unsupported size.");
> +
> +		igt_i915_driver_unload();
> +	}
>  
>  	/* Subtests should unload the module themselves if they use modparams */
>  }
> -- 
> 2.27.0
>