[PATCH V3 i-g-t] tests/xe_exec_threads: Make hang tests reset domain aware

[Tejas Upadhyay <tejas.upadhyay@intel.com>]

RCS/CCS are dependent engines as they are sharing reset
domain. Whenever there is reset from CCS, all the exec queues
running on RCS are victimised mainly on Lunarlake.

Lets skip parallel execution on CCS with RCS.

It helps in fixing following errors:
1. Test assertion failure function test_legacy_mode, file, Failed assertion: data[i].data == 0xc0ffee

2.Test assertion failure function xe_exec, file ../lib/xe/xe_ioctl.c, Failed assertion: __xe_exec(fd, exec) == 0, error: -125 != 0

V3:
  - Check victimization reset domain wise irrespective of platform - Lucas/MattR
V2:
  - Add error details

Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
---
 tests/intel/xe_exec_threads.c | 43 ++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/tests/intel/xe_exec_threads.c b/tests/intel/xe_exec_threads.c
index 8083980f9..24eac39de 100644
--- a/tests/intel/xe_exec_threads.c
+++ b/tests/intel/xe_exec_threads.c
@@ -710,6 +710,24 @@ static void *thread(void *data)
 	return NULL;
 }
 
+static bool is_engine_contexts_victimized(__u16 eclass, unsigned int flags,
+					  bool has_rcs, bool multi_ccs,
+					  bool *ccs0_created)
+{
+	if (!(eclass == DRM_XE_ENGINE_CLASS_COMPUTE && flags & HANG))
+		return false;
+	if (has_rcs) {
+		return true;
+	} else if (multi_ccs) {
+		/* In case of multi ccs, allow only 1 ccs to run HANG test*/
+		if (*ccs0_created)
+			return true;
+		*ccs0_created = true;
+	}
+
+	return false;
+}
+
 /**
  * SUBTEST: threads-%s
  * Description: Run threads %arg[1] test with multi threads
@@ -955,9 +973,20 @@ static void threads(int fd, int flags)
 	bool go = false;
 	int n_threads = 0;
 	int gt;
+	bool has_rcs = false;
+	bool multi_ccs = false, has_ccs = false, ccs0_created = false;
 
-	xe_for_each_engine(fd, hwe)
+	xe_for_each_engine(fd, hwe) {
+		if (hwe->engine_class == DRM_XE_ENGINE_CLASS_RENDER) {
+			has_rcs = true;
+		} else if (hwe->engine_class == DRM_XE_ENGINE_CLASS_COMPUTE) {
+			if (has_ccs)
+				multi_ccs = true;
+			else
+				has_ccs = true;
+		}
 		++n_engines;
+	}
 
 	if (flags & BALANCER) {
 		xe_for_each_gt(fd, gt)
@@ -990,6 +1019,18 @@ static void threads(int fd, int flags)
 	}
 
 	xe_for_each_engine(fd, hwe) {
+		/* RCS/CCS sharing reset domain hence dependent engines.
+		 * When CCS is doing reset, all the contexts of RCS are
+		 * victimized. Also in case of multiple CCS instances
+		 * contexts running on other CCS engine are victimized.
+		 * so skip the compute engine avoiding parallel execution
+		 * with RCS and other CCS.
+		 */
+		if (is_engine_contexts_victimized(hwe->engine_class, flags,
+						  has_rcs, multi_ccs,
+						  &ccs0_created))
+			continue;
+
 		threads_data[i].mutex = &mutex;
 		threads_data[i].cond = &cond;
 #define ADDRESS_SHIFT	39
-- 
2.25.1