Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751871AbaAJNxj (ORCPT ); Fri, 10 Jan 2014 08:53:39 -0500 Received: from mail-qa0-f54.google.com ([209.85.216.54]:34830 "EHLO mail-qa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbaAJNxi (ORCPT ); Fri, 10 Jan 2014 08:53:38 -0500 Date: Fri, 10 Jan 2014 08:54:38 -0500 (EST) From: Vince Weaver To: eranian@gmail.com cc: Will Deacon , Vince Weaver , Chad Paradis , Peter Zijlstra , "linux-kernel@vger.kernel.org" , Paul Mackerras , Ingo Molnar , Arnaldo Carvalho de Melo Subject: Re: [patch/rfc] perf on raspberry-pi without overflow interrupt In-Reply-To: Message-ID: References: <20140108225315.GG31570@twins.programming.kicks-ass.net> <20140109101921.GA26435@mudshark.cambridge.arm.com> <20140110100804.GB11045@mudshark.cambridge.arm.com> User-Agent: Alpine 2.10 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 10 Jan 2014, Stephane Eranian wrote: > But before we do that, can someone confirm that on Pi there is simply > no interrupt > generated by the PMU or is it that we don't know how to route it back? The closest I've seen is this posting from one of the rasp-pi employees who presumably has access to better documentation than we do: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=33&t=19151 It sounds like the SoC just doesn't bother hooking the nPMUIRQ line up anything useful on the interrupt controller. The Pi is complicated because it's really just a GPU chip that just happens to have an ARM1176 core hanging off the side of it. Vince -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/