vgsp-gr: m152 scratch-PT alias cache + extended pool; m153 outcome-verifying launch retry

m152: the Tier-2 shadow alias pool consumed one never-reused 128 B fetch
line per mapping per launch (512 lines/boot), so a normal launch mix
exhausted it permanently: every later launch that needed a new mapping
was refused (the deterministic r152 'launch refused: no Tier-1 mapping'
loop). Two fixes: (a) an HPA-keyed alias cache in map_shadow_locked that
returns the existing never-rewritten VA for a page already mapped, so
repeat launches of the same buffers/sem pages consume nothing; a hit
reports line_out = ~0 so contiguity bookkeeping never extends an old
line; (b) a 48-window extension pool at VA 0x04000000 (PD0 indices
32..79, one 48-page PT chunk) raising capacity to 2048 lines/boot.

m153: the intermittent per-boot mis-execution classes (engine wrote
nothing; or wrote into a lower operand window while the output operand
stayed untouched - both complete with qmd_rel/ch_rel satisfied, live
evidence in r152 smiley: passes wrote b into the a window / nothing /
correct-after-10s-retry) are now detected by the m151 retirement wait
and retried: refill the bounce window from the guest inputs, re-publish
the same method block on a fresh ring entry, re-issue schedule, re-poll,
re-wait - bounded by the timeout path's attempt budget. Gate param
gsp_phys_rmcall_gr_nowrite_retry (default 1).

1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/gsp_phys_gpu.h b/kernel/gsp_phys_gpu.h
index f93603c..73b0822 100644
--- a/kernel/gsp_phys_gpu.h
+++ b/kernel/gsp_phys_gpu.h
@@ -365,6 +365,10 @@ unsigned int gsp_phys_rmcall_gr_lmem_tpc_size_value(void);
 /* m72: log SKED CWD/HWW register transitions during the launch poll. */
 int gsp_phys_rmcall_gr_skedrec_value(void);
 
+/* m153: re-execute a forwarded launch whose retirement wait saw zero or
+ * wrong-place engine writes (default 1 = enabled). */
+int gsp_phys_rmcall_gr_nowrite_retry_value(void);
+
 /* m73: use host-visible sysmem chunks for V7 instance/RAMFC (m62 shape). */
 int gsp_phys_rmcall_gr_inst_sys_value(void);