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

[priyanka.dandamudi at intel.com]

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 */
 	}
+	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