drm/amdkfd: update GFX11 CWSR trap handler

With corresponding FW change fixes issue where triggering CWSR on a
workgroup with waves in s_barrier wouldn't lead to a back-off and
therefore cause a hang.
Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Tested-by: Graham Sider <Graham.Sider@amd.com>
Acked-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Graham Sider <Graham.Sider@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 6.0.x

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx10.asm

@@ -186,6 +186,12 @@ L_SKIP_RESTORE:
 	s_getreg_b32	s_save_trapsts, hwreg(HW_REG_TRAPSTS)
 
 #if SW_SA_TRAP
+	// If ttmp1[30] is set then issue s_barrier to unblock dependent waves.
+	s_bitcmp1_b32	s_save_pc_hi, 30
+	s_cbranch_scc0	L_TRAP_NO_BARRIER
+	s_barrier
+
+L_TRAP_NO_BARRIER:
 	// If ttmp1[31] is set then trap may occur early.
 	// Spin wait until SAVECTX exception is raised.
 	s_bitcmp1_b32	s_save_pc_hi, 31