On 11/04/2019 11:44, Michal Wajdeczko wrote: > Due to the upcoming changes to the GuC ABI interface, we must > disable GuC submission mode until final ABI will be available > on all GuC firmwares. If I understand correctly, you are disabling command submission by returning -EIO, which leads to the GPU being marked as wedged but KMS still working. If I read the code correctly, this is a weak NACK from me, as even though Linux module parameters aren't considered stable unless marked otherwise (https://www.kernel.org/doc/Documentation/ABI/stable/sysfs-module), users are already relying on enable_guc=3 and after updating their kernel they will get a non-functional GPU. See https://www.google.de/search?q=enable_guc%3D3 My strong recommendation is to fallback to execlist and warn in the logs that GuC command submission is not considered stable and that i915 fellback to execlists, which are tested and known to work. You can then drop patch 22. If you plan on going through with this plan, the least you should do is look at new bugs in mesa and i915 every day for the next year or so for wedged GPUs on boot, as users will have forgotten they set the option and will think this is a regression. Are you ready to make this commitment? Martin > > Signed-off-by: Michal Wajdeczko <michal.wajdeczko@xxxxxxxxx> > Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@xxxxxxxxx> > Cc: John Spotswood <john.a.spotswood@xxxxxxxxx> > Cc: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx> > Cc: Tony Ye <tony.ye@xxxxxxxxx> > Cc: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx> > Cc: Jeff Mcgee <jeff.mcgee@xxxxxxxxx> > Cc: Antonio Argenziano <antonio.argenziano@xxxxxxxxx> > Cc: Sujaritha Sundaresan <sujaritha.sundaresan@xxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_uc.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c > index 2a56e2363888..21310b917ccc 100644 > --- a/drivers/gpu/drm/i915/intel_uc.c > +++ b/drivers/gpu/drm/i915/intel_uc.c > @@ -130,6 +130,13 @@ static void sanitize_options_early(struct drm_i915_private *i915) > "no HuC firmware"); > } > > + /* XXX: Verify GuC submission support */ > + if (intel_uc_is_using_guc_submission(i915)) { > + DRM_WARN("Incompatible option detected: %s=%d, %s!\n", > + "enable_guc", i915_modparams.enable_guc, > + "submission not supported"); > + } > + > /* A negative value means "use platform/config default" */ > if (i915_modparams.guc_log_level < 0) > i915_modparams.guc_log_level = > @@ -286,6 +293,10 @@ int intel_uc_init(struct drm_i915_private *i915) > if (!HAS_GUC(i915)) > return -ENODEV; > > + /* XXX: GuC submission is unavailable for now */ > + if (USES_GUC_SUBMISSION(i915)) > + return -EIO; > + > ret = intel_guc_init(guc); > if (ret) > return ret; > _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
