On Mon, Mar 4, 2024, at 3:34 PM, Vinay Belgaumkar wrote: > Allow user to provide a low latency context hint. When set, KMD > sends a hint to GuC which results in special handling for this > context. SLPC will ramp the GT frequency aggressively every time > it switches to this context. The down freq threshold will also be > lower so GuC will ramp down the GT freq for this context more slowly. > We also disable waitboost for this context as that will interfere with > the strategy. > > We need to enable the use of SLPC Compute strategy during init, but > it will apply only to contexts that set this bit during context > creation. > > Userland can check whether this feature is supported using a new param- > I915_PARAM_HAS_CONTEXT_FREQ_HINTS. This flag is true for all guc submission > enabled platforms as they use SLPC for frequency management. > > The Mesa usage model for this flag is here - > https://gitlab.freedesktop.org/sushmave/mesa/-/commits/compute_hint > > v2: Rename flags as per review suggestions (Rodrigo, Tvrtko). > Also, use flag bits in intel_context as it allows finer control for > toggling per engine if needed (Tvrtko). > > v3: Minor review comments (Tvrtko) > > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx> > Cc: Sushma Venkatesh Reddy <sushma.venkatesh.reddy@xxxxxxxxx> > Acked-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx> > --- Acked-by: Ivan Briano <ivan.briano@xxxxxxxxx>
