diff options
Diffstat (limited to 'kernel/gsp_phys_gpu.c')
| -rw-r--r-- | kernel/gsp_phys_gpu.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/kernel/gsp_phys_gpu.c b/kernel/gsp_phys_gpu.c index 512d30b..fc84c1d 100644 --- a/kernel/gsp_phys_gpu.c +++ b/kernel/gsp_phys_gpu.c @@ -248,6 +248,31 @@ bool gsp_phys_work_hw_primary_enabled(void) EXPORT_SYMBOL_GPL(gsp_phys_work_hw_primary_enabled); /* + * P6c completion relay (default 0). When set together with + * gsp_phys_work_forward=1, gsp_phys_guest_mem=1 and + * gsp_phys_work_defer_release=1, a forwarded guest CE copy additionally maps + * the guest-visible semaphore page into the CE channel page tables and lets + * the engine author one selected one-word release into it (custom payload). + * The hold then verifies the guest word carries the payload and skips the + * software apply of that one record; every refusal, hardware failure, + * timeout, abort or failed verification leaves the unchanged software apply + * in charge, so the release stays exactly-once. With 0, every behavior is + * byte-identical to wave 2 (the module semaphore is polled; no guest + * semaphore page is ever mapped or pinned). One-line rollback: + * gsp_phys_relay=0. + */ +static bool gsp_phys_relay_param; +module_param_named(gsp_phys_relay, gsp_phys_relay_param, bool, 0644); +MODULE_PARM_DESC(gsp_phys_relay, + "Let the forwarded guest CE copy author the selected guest-visible semaphore release into the guest semaphore page (default 0: software release stays the sole author; requires gsp_phys_work_forward=1 and gsp_phys_guest_mem=1 and gsp_phys_work_defer_release=1)"); + +bool gsp_phys_relay_enabled(void) +{ + return gsp_phys_relay_param; +} +EXPORT_SYMBOL_GPL(gsp_phys_relay_enabled); + +/* * One-way power latch (default). Re-enabling runtime PM and D3cold after a * claim lets the board power-gate and the host hard-freeze on resume * (observed 2026-10-01); keep the pre-claim D0 policy instead and require |