gr: default wedge quiet window 40 s (r417 live: a 20 s host hold did not heal, the next 40 s hold did - legit engine writes resumed)

r417 reproduced the wedge deterministically with wedge_recover v2 (ITER 0
green, ITER 1 zero-write, both with the legacy win0 shadow path on and
with the icache-invalidate bit forced off - the bit is not the trigger)
and exercised the r410 quiet path for the first time: the 20 s hold left
the outcome at 0 pages, the following 40 s hold logged 'WEDGE-QUIET
healed: engine wrote 1 page(s) after the 40000 ms hold (streak was 1)'.
A shadow-win0=0 A/B showed the engine executes but fetches the wrong
program in that legacy shape (all-32768 wrong), so the win0 shadow path
stays on. Default base raised to 40 s so the first hold heals instead of
paying 20 s + 40 s.

1 files changed, 6 insertions, 4 deletions

diff --git a/kernel/gsp_phys_gpu.c b/kernel/gsp_phys_gpu.c
index 6bd5aa0..b93c254 100644
--- a/kernel/gsp_phys_gpu.c
+++ b/kernel/gsp_phys_gpu.c
@@ -1124,23 +1124,25 @@ int gsp_phys_gr_nowrite_retries_value(void)
 EXPORT_SYMBOL_GPL(gsp_phys_gr_nowrite_retries_value);
 
 /*
- * r410 wedge quiet window (gsp_phys_gr_wedge_quiet_ms; default 20000, clamped
+ * r410 wedge quiet window (gsp_phys_gr_wedge_quiet_ms; default 40000, clamped
  * [0,120000]; 0 disables). The sticky per-lane no-execute wedge (100% of
  * launches no-write while kept busy) is proven to CLEAR when the lane stays
  * quiet for tens of seconds (r409: a ~37 s client gap healed a wedged run;
  * r416: 58 consecutive no-write launches during a 126 s client run, first
- * launches green again after the lane sat ~52 s idle). Immediate retries and
+ * launches green again after the lane sat ~52 s idle; r417: a 20 s host hold
+ * did not heal, a 40 s hold did - "WEDGE-QUIET healed: engine wrote 1
+ * page(s) after the 40000 ms hold"). Immediate retries and
  * re-arms do not heal it (r409/r154). So when a zero-write outcome follows a
  * previous accepted zero-write launch, the retry loop first holds this many ms
  * with NO submissions to the engine, then re-arms (lane enable + schedules)
  * and re-publishes once. The value doubles per further quiet retry. The
  * quiet window is recovery-only: a launch that wrote anything never enters it.
  */
-static unsigned int gsp_phys_gr_wedge_quiet_ms_param = 20000u;
+static unsigned int gsp_phys_gr_wedge_quiet_ms_param = 40000u;
 module_param_named(gsp_phys_gr_wedge_quiet_ms,
 		   gsp_phys_gr_wedge_quiet_ms_param, uint, 0644);
 MODULE_PARM_DESC(gsp_phys_gr_wedge_quiet_ms,
-		 "Quiet-window ms before retrying a launch on a lane whose previous launch also no-wrote (0=disable, default 20000)");
+		 "Quiet-window ms before retrying a launch on a lane whose previous launch also no-wrote (0=disable, default 40000; r417: a 20 s hold did not heal, 40 s healed)");
 
 unsigned int gsp_phys_gr_wedge_quiet_ms_value(void)
 {