[PATCH i-g-t] tests/intel/xe_mmap: Acquire rpm reference for pci-membarrier-paraller test

[Kolanupaka Naveena]

During the test, the device is entering into runtime suspend, which is
leading the device to d3hot or d3cold mode. Hence the read is giving
a special value 0xffffffff.

To avoid this issue acquired an rpm ref to keep the device awake
during the access.

Suggested-by: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: Kolanupaka Naveena <kolanupaka.naveena at intel.com>
---
 tests/intel/xe_mmap.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/intel/xe_mmap.c b/tests/intel/xe_mmap.c
index 5fd641075..51c27586f 100644
--- a/tests/intel/xe_mmap.c
+++ b/tests/intel/xe_mmap.c
@@ -11,6 +11,8 @@
  * Functionality: mmap
  */
 
+#include <fcntl.h>
+
 #include "igt.h"
 
 #include "xe_drm.h"
@@ -428,16 +430,20 @@ igt_main
 		int xe;
 		unsigned int i;
 		uint32_t *ptr;
+		int fw_handle = -1;
 
 		igt_require(is_pci_membarrier_supported(fd));
 		xe = drm_open_driver(DRIVER_XE);
 		srand(time(0));
 		i = rand() % (PAGE_SIZE / sizeof(*ptr));
+		fw_handle = igt_debugfs_open(fd, "forcewake_all", O_RDONLY);
+		igt_assert_lte(0, fw_handle);
 		igt_fork(child, 1)
 			test_pci_membarrier_parallel(xe, child, i);
 		test_pci_membarrier_parallel(fd, -1, i);
 		igt_waitchildren();
 
+		close(fw_handle);
 		close(xe);
 	}
 
-- 
2.34.1