[PATCH i-g-t] lib/intel_compute: Wait for compute walker before returning to ring

["Zbigniew Kempczyński" <zbigniew.kempczynski@intel.com>]

Most compute tests don't need to synchronize at the batch level as
kmd executes pipe-control at some point. Last xe driver proposal (link
below) causes turning off preemption before pipe-control preventing
entering to SIP and finish the WMTP test properly.

Change adds pipe-control at batch level causing sync wait on
compute-walker and preventing disabling the preemption prematurely.

Link: https://patchwork.freedesktop.org/series/160113/
Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Francois Dugast <francois.dugast@intel.com>
---
 lib/intel_compute.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/intel_compute.c b/lib/intel_compute.c
index 00ef280e8f..8578b6e402 100644
--- a/lib/intel_compute.c
+++ b/lib/intel_compute.c
@@ -1694,6 +1694,13 @@ static void xe2lpg_compute_exec_compute(int fd,
 	addr_bo_buffer_batch[b++] = 0x00000000;
 	addr_bo_buffer_batch[b++] = 0x00000000;
 
+	addr_bo_buffer_batch[b++] = PIPE_CONTROL;
+	addr_bo_buffer_batch[b++] = 0x00100000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+
 	addr_bo_buffer_batch[b++] = MI_BATCH_BUFFER_END;
 }
 
@@ -2032,6 +2039,13 @@ static void xe3p_compute_exec_compute(int fd,
 	addr_bo_buffer_batch[b++] = 0x00000000; /* dw62 */
 	addr_bo_buffer_batch[b++] = 0x00000000; /* dw63 */
 
+	addr_bo_buffer_batch[b++] = PIPE_CONTROL;
+	addr_bo_buffer_batch[b++] = 0x00100000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+	addr_bo_buffer_batch[b++] = 0x00000000;
+
 	addr_bo_buffer_batch[b++] = MI_BATCH_BUFFER_END;
 }
 
-- 
2.43.0