linux-kernel - Re: [PATCH 5/7] thermal: intel: hfi: Enable notification interrupt

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Message-ID: <YYjnUM/v8LmtnBq3@hirez.programming.kicks-ass.net>
Date:   Mon, 8 Nov 2021 10:01:04 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-pm@...r.kernel.org, x86@...nel.org,
        linux-doc@...r.kernel.org, Len Brown <len.brown@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Amit Kucheria <amitk@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Ricardo Neri <ricardo.neri@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] thermal: intel: hfi: Enable notification interrupt

On Fri, Nov 05, 2021 at 06:33:10PM -0700, Ricardo Neri wrote:
> +	/*
> +	 * On most systems, all CPUs in the package receive a package-level
> +	 * thermal interrupt when there is an HFI update. Since they all are
> +	 * dealing with the same update (as indicated by the update timestamp),
> +	 * it is sufficient to let a single CPU to acknowledge the update and
> +	 * schedule work to process it.
> +	 */

That's pretty crap hardware behaviour. Is there really no way to steer
these interrupts?