diff options
Diffstat (limited to 'tools/guest-diag')
| -rw-r--r-- | tools/guest-diag/fenceword_assist.py | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/tools/guest-diag/fenceword_assist.py b/tools/guest-diag/fenceword_assist.py index 3c45514..9e207e2 100644 --- a/tools/guest-diag/fenceword_assist.py +++ b/tools/guest-diag/fenceword_assist.py @@ -3,13 +3,25 @@ # fenceword_assist.py - keep the Vulkan fence wait word of a live vk_frame120 # client released (session 125). # +# SUPERSEDED (SESSION 126, commit 95e7f57e): the service now authors these +# releases itself. The `sema_gr_ahead` fence fold sweeps the channel's +# pre-built ring continuation beyond GP_PUT through the ring's validated +# GPFIFO translation, decodes the INC-5 RELEASE groups it finds (addr 0x5c +# count>=5) and queues them in the standard pending ledger; r717 evidence: +# `sema-ahead: h=0xbeec0100 put=11 swept=10 rels=4` followed 30 ms later by +# `sema-svc: deferred release va=0x45ba090 payload=1 (was cur=0)`, with +# VKFRAME seq/DONE and NO assist running (see +# backups/evidence-20261002-victory/r717-fencefold/). Keep this tool only as +# the A/B fallback for boots that predate the fold (or with +# sema_gr_ahead=0). +# # The client's fence wait polls a word in a 16 KB /dev/nvidiactl BO mapped # read-write into the client: the init wait word lives at +0x80 (the t122 # "BW" chaser writes it once) and the per-submit fence word at +0x90 of the # SAME BO (GPU VA <base>+0x90, delivered by the submit push's INC-5 semaphore # group). While the emulation does not apply that group, this host assist # writes 1 to the +0x90 slot whenever it reads 0 - the direct predecessor of -# the service-side fold (see Handoff SESSION 125). +# the service-side fold (see Handoff SESSION 125/126). # # Usage (host, while a t122-driven client runs): # tools/guest-diag/fenceword_assist.py [seconds] [guest-pid] |