Quoting Mika Kuoppala (2017-11-02 13:56:50)
> Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes:
> > -
> > - execlists_init_reg_state(vaddr + LRC_STATE_PN * PAGE_SIZE,
> > - ctx, engine, ring);
> > + regs = vaddr + LRC_STATE_PN * PAGE_SIZE;
> > + execlists_init_reg_state(regs, ctx, engine, ring);
> > + if (!engine->default_state) {
> > + regs[CTX_CONTEXT_CONTROL+1] |=
> > + _MASKED_BIT_ENABLE(CTX_CTRL_ENGINE_CTX_RESTORE_INHIBIT);
> > + }
>
> We will get the default state we copy from now with restore inhibit set
> for all copied context. Where do we clear it?
It's one of those magic bits that only affect the next context-switch.
When the context is saved again, the bit it cleared, so the default
state we inherit doesn't have that bit set.
-Chris
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