From patchwork Fri Jan 27 13:32:43 2012
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Subject: oprofile and ARM A9 hardware counter
From: stephane eranian <eranian@googlemail.com>
X-Patchwork-Id: 138225
Message-Id: <CAMsRxf++i+CQZvPvGaHD_zOT-B-P0R-UyLTVRiA-XdFYUiY_JA@mail.gmail.com>
To: Will Deacon <will.deacon@arm.com>
Cc: =?UTF-8?B?TcOlbnMgUnVsbGfDpXJk?= <mans@mansr.com>, "Cousson,
 Benoit" <b-cousson@ti.com>, Ming Lei <ming.lei@canonical.com>,
 "oprofile-list@lists.sourceforge.net"
 <oprofile-list@lists.sourceforge.net>, 
 "linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
 "linux-arm-kernel@lists.infradead.org"
 <linux-arm-kernel@lists.infradead.org>
Date: Fri, 27 Jan 2012 14:32:43 +0100

2012/1/27 Will Deacon <will.deacon@arm.com>:
> Mans,
>
> On Fri, Jan 27, 2012 at 12:56:35PM +0000, Måns Rullgård wrote:
>> Will Deacon <will.deacon@arm.com> writes:
>> > Did this lead anywhere in the end? It seems as though Ming Lei has a working
>> > setup but Stephane is unable to replicate it, despite applying the necessary
>> > patches and trying an updated bootloader.
>>
>> With the patches listed above plus the one in [1], I get PMU interrupts.
>> However, unless I restrict the profiled process to one CPU
>> (taskset 1 perf record ...), I get a panic in armpmu_event_update() with
>> the 'event' argument being null when called from armv7pmu_handle_irq().
>>
>> [1] http://article.gmane.org/gmane.linux.ports.arm.omap/69696
>
Ok, I am recompiling the kernel for this one line fix:

linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel


--- a/arch/arm/mach-omap2/clockdomains44xx_data.c
+++ b/arch/arm/mach-omap2/clockdomains44xx_data.c
@@ -390,7 +390,7 @@ static struct clockdomain emu_sys_44xx_clkdm = {
       .prcm_partition   = OMAP4430_PRM_PARTITION,
       .cm_inst          = OMAP4430_PRM_EMU_CM_INST,
       .clkdm_offs       = OMAP4430_PRM_EMU_CM_EMU_CDOFFS,
-       .flags            = CLKDM_CAN_HWSUP,
+       .flags            = CLKDM_CAN_SWSUP,
 };

_______________________________________________