diff options
Diffstat (limited to 'kernel/gsp_phys_gpu.c')
| -rw-r--r-- | kernel/gsp_phys_gpu.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/kernel/gsp_phys_gpu.c b/kernel/gsp_phys_gpu.c index ee6625c..629bd3a 100644 --- a/kernel/gsp_phys_gpu.c +++ b/kernel/gsp_phys_gpu.c @@ -970,6 +970,30 @@ int gsp_phys_rmcall_gr_shadow_win0_value(void) EXPORT_SYMBOL_GPL(gsp_phys_rmcall_gr_shadow_win0_value); /* + * m91: keep the forwarded launch's QMD pointer pairs (param w32/33, program + * w48/49, prefetch w8/w31) at the guest's original VAs instead of rewriting + * them to the window-0 shadow copies (gsp_phys_rmcall_gr_ptr_guest; default + * 0). Rationale: the m90/m91 trap shows the SM I-fetch at the shadow VA is + * refused with WARP_ESR=MMU_NACK while the FE reads the same PT line fine, + * so the SM walk appears to use the guest subctx page directory (which maps + * the guest VAs) rather than the channel/ladder VAS. With this set, the + * shadow copies are still made (for logs/bookkeeping) but unused, and the + * engine sees exactly the pointer values the real driver's captured QMD + * carries. + */ +static int gsp_phys_rmcall_gr_ptr_guest_param; +module_param_named(gsp_phys_rmcall_gr_ptr_guest, + gsp_phys_rmcall_gr_ptr_guest_param, int, 0644); +MODULE_PARM_DESC(gsp_phys_rmcall_gr_ptr_guest, + "Keep forwarded QMD pointer pairs at the guest VAs (SM walk appears to use the guest subctx PDB; default 0)"); + +int gsp_phys_rmcall_gr_ptr_guest_value(void) +{ + return gsp_phys_rmcall_gr_ptr_guest_param; +} +EXPORT_SYMBOL_GPL(gsp_phys_rmcall_gr_ptr_guest_value); + +/* * Ladder VAS ownership selector (gsp_phys_rmcall_vas_shared; default 0). * The H1 GR promote wall is a direct consequence of the ladder's * externally-owned FERMI_VASPACE_A: with IS_EXTERNALLY_OWNED the RM treats |