vgsp: eng64 - chain the release behind the pack carrier and name a stalled carrier's gate

c779: the pack-continuation carrier completed the pack
(MME-CARRY-COMPLETE gen=4 off=2799/2799) and armed the release
(MME-CARRY-ARM mode=release), but its launch poll held the single
forwarding slot for 2801 ms; the armed release then deferred
request-inflight until the beef channel unregistered at +2.2 s, so the
release ended in MME-CARRY-HOLD reason=no-channel.

- svc_fwd_gr_work: after a successful synthetic pack carrier, wait out
  the release grace in the same slot, claim it and run the release work
  directly (chained MME-CARRY-FIRE mode=release ... receipt). Gate:
  sema_gl_mme_release_chain (default 1; release carrier still default 0).
- pump pack-carry block: an armed due carrier that cannot go out now
  names its blocker (MME-CARRY-WAIT reason=no-channel/client-candidate/
  request-inflight/fe-defer), so the c781-class silent stall is visible.
- booter: gsp_phys_gr_mme_release_waiting()/chain_enabled() helpers.

c783-c785 (a03a68ea build) were all shallow (author=0, no MME window).

1 files changed, 2 insertions, 0 deletions

diff --git a/kernel/gsp_phys_booter.h b/kernel/gsp_phys_booter.h
index 21eb1fc..30aef8f 100644
--- a/kernel/gsp_phys_booter.h
+++ b/kernel/gsp_phys_booter.h
@@ -596,6 +596,8 @@ void gsp_phys_gr_mme_carry_failed(int rc);
  * through the normal fill/build path with the CALL runs released.
  */
 bool gsp_phys_gr_mme_release_peek(u32 *h_object);
+bool gsp_phys_gr_mme_release_waiting(void);
+bool gsp_phys_gr_mme_release_chain_enabled(void);
 bool gsp_phys_gr_mme_release_take(u32 h_object, u32 *held, u32 *win);
 void gsp_phys_gr_mme_release_rearm(void);
 bool gsp_phys_gr_mme_release_is_arming(u32 h, u64 push);