linux-kernel - Getting rid of i7300

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Message-ID: <CALCETrVGefbgXzvjC3bTm9DgSr2UkpsPn6P_QwKm1cogZ0AVkQ@mail.gmail.com>
Date:	Thu, 4 Jun 2015 16:32:25 -0700
From:	Andy Lutomirski <luto@...nel.org>
To:	Andy Henroid <andrew.d.henroid@...el.com>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
	Matthew Garrett <mjg59@...f.ucam.org>
Subject: Getting rid of i7300_idle's idle notifier?

AFAICT the sole purpose for the hideous x86_64 idle_notifier mess is
to support i7300_idle.  IMO this junk does not belong in IRQ handling,
etc.  Can we redo this to work in some kind of generic way?

I have no idea why it makes sense to twiddle I/O AT registers in the
beginning of whatever IRQ wakes up the CPU.

Note that, if absolutely necessary, the ECX bit 0 MWAIT extension can
be used to reliably execute code before handling interrupts that wake
us from idle.  That is, there could be a real cpuidle driver for that
chip that does:

cli;
poke ioat;
mwait(ecx = 1);
poke ioat;
sti;

Or we could delete the driver entirely.

--Andy
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