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

[Matthew Auld <matthew.auld@intel.com>]

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);
+
 		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