From: Grazvydas Ignotas <notasas@gmail.com>
To: Tony Lindgren <tony@atomide.com>
Cc: Matthijs van Duin <matthijsvanduin@gmail.com>,
Pavel Machek <pavel@ucw.cz>,
"linux-omap@vger.kernel.org" <linux-omap@vger.kernel.org>,
Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
Sebastian Reichel <sre@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: ARM errata 430973 on multi platform kernels
Date: Fri, 10 Apr 2015 01:37:05 +0300 [thread overview]
Message-ID: <CANOLnOMyNesvA2nGC2uMnmYGLBQkU1dnfG1rBg1UWeGMrpHFzQ@mail.gmail.com> (raw)
In-Reply-To: <20150407022312.GK18048@atomide.com>
On Tue, Apr 7, 2015 at 5:23 AM, Tony Lindgren <tony@atomide.com> wrote:
> * Matthijs van Duin <matthijsvanduin@gmail.com> [150406 11:15]:
>>
>> On 6 April 2015 at 19:42, Tony Lindgren <tony@atomide.com> wrote:
>> > Hmm but it still seems to do something also on cortex-a8 r3p2 that
>> > is supposedly not affected by 430973.. Based on my tests so far, at least
>> > armhf running cpuburn-a8 in the background and doing apt-get update
>> > segfaults constantly without flush BTAC/BTB. This seems to be the case
>> > no matter how the aux ctrl reg bits are set..
>>
>> That sounds.... really odd. The TRM is fairly explicit about BTB
>> flush executing as nop when IBE is not set. Of course the TRM is not
>> exactly flawless, but still...
>
> Oops, sorry user error.. I was trying to clear IBE as a banked register
> like L2 enable bit and of course it did not get cleared.. Clearing it
> with a smc call really clears it. And in that case my test case seems to
> work reliably on r3p2 without erratum 430973 enabled.
May I ask how do you perform the smc call? I wanted to clear IBE too
to experiment, but it just hangs my board, even if I just write back
the same value. Here is what I do:
asm ("mrc p15, 0, %0, c1, c0, 1" : "=r"(val));
asm (".arch_extension sec\n\t"
"mov r0, %0\n"
"mov r12, #3\n"
"smc #0\n"
:: "r"(val) : "r0", "r12");
I just run this from a sysfs write handler, does it need to be run on
SRAM or something?
Gražvydas
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WARNING: multiple messages have this Message-ID (diff)
From: notasas@gmail.com (Grazvydas Ignotas)
To: linux-arm-kernel@lists.infradead.org
Subject: ARM errata 430973 on multi platform kernels
Date: Fri, 10 Apr 2015 01:37:05 +0300 [thread overview]
Message-ID: <CANOLnOMyNesvA2nGC2uMnmYGLBQkU1dnfG1rBg1UWeGMrpHFzQ@mail.gmail.com> (raw)
In-Reply-To: <20150407022312.GK18048@atomide.com>
On Tue, Apr 7, 2015 at 5:23 AM, Tony Lindgren <tony@atomide.com> wrote:
> * Matthijs van Duin <matthijsvanduin@gmail.com> [150406 11:15]:
>>
>> On 6 April 2015 at 19:42, Tony Lindgren <tony@atomide.com> wrote:
>> > Hmm but it still seems to do something also on cortex-a8 r3p2 that
>> > is supposedly not affected by 430973.. Based on my tests so far, at least
>> > armhf running cpuburn-a8 in the background and doing apt-get update
>> > segfaults constantly without flush BTAC/BTB. This seems to be the case
>> > no matter how the aux ctrl reg bits are set..
>>
>> That sounds.... really odd. The TRM is fairly explicit about BTB
>> flush executing as nop when IBE is not set. Of course the TRM is not
>> exactly flawless, but still...
>
> Oops, sorry user error.. I was trying to clear IBE as a banked register
> like L2 enable bit and of course it did not get cleared.. Clearing it
> with a smc call really clears it. And in that case my test case seems to
> work reliably on r3p2 without erratum 430973 enabled.
May I ask how do you perform the smc call? I wanted to clear IBE too
to experiment, but it just hangs my board, even if I just write back
the same value. Here is what I do:
asm ("mrc p15, 0, %0, c1, c0, 1" : "=r"(val));
asm (".arch_extension sec\n\t"
"mov r0, %0\n"
"mov r12, #3\n"
"smc #0\n"
:: "r"(val) : "r0", "r12");
I just run this from a sysfs write handler, does it need to be run on
SRAM or something?
Gra?vydas
next prev parent reply other threads:[~2015-04-09 22:37 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-01 19:07 [PATCH RESEND] ARM: dts: OMAP3-N900: Add microphone bias voltages Jarkko Nikula
2015-03-30 16:30 ` Jarkko Nikula
[not found] ` <55197A12.1050009-FVTvWyuFUl3QT0dZR+AlfA@public.gmane.org>
2015-03-30 16:42 ` Tony Lindgren
2015-03-30 17:45 ` Jarkko Nikula
[not found] ` <55198BA4.5010207-FVTvWyuFUl3QT0dZR+AlfA@public.gmane.org>
2015-03-30 17:50 ` Tony Lindgren
2015-03-31 12:32 ` Sebastian Reichel
2015-04-01 19:47 ` Tony Lindgren
2015-04-03 16:35 ` ARM errata 430973 on multi platform kernels (was: OMAP3-N900: Add microphone bias voltages) Sebastian Reichel
2015-04-03 18:39 ` Tony Lindgren
2015-04-03 18:39 ` Tony Lindgren
2015-04-03 19:21 ` Robert Nelson
2015-04-03 19:21 ` Robert Nelson
2015-04-05 13:00 ` Sebastian Reichel
2015-04-05 13:00 ` Sebastian Reichel
2015-04-05 13:26 ` Pali Rohár
2015-04-05 13:26 ` Pali Rohár
2015-04-05 13:45 ` Sebastian Reichel
2015-04-05 13:45 ` Sebastian Reichel
2015-04-05 13:52 ` Pali Rohár
2015-04-05 13:52 ` Pali Rohár
2015-04-06 17:38 ` Sebastian Reichel
2015-04-06 17:38 ` Sebastian Reichel
2015-04-03 20:42 ` Pavel Machek
2015-04-03 20:42 ` Pavel Machek
2015-04-03 22:08 ` ARM errata 430973 on multi platform kernels Ivaylo Dimitrov
2015-04-03 22:08 ` Ivaylo Dimitrov
2015-04-03 22:15 ` Tony Lindgren
2015-04-03 22:15 ` Tony Lindgren
2015-04-03 22:47 ` Ivaylo Dimitrov
2015-04-03 22:47 ` Ivaylo Dimitrov
2015-04-03 22:52 ` Tony Lindgren
2015-04-03 22:52 ` Tony Lindgren
2015-04-05 4:13 ` Matthijs van Duin
2015-04-05 4:13 ` Matthijs van Duin
2015-04-05 7:23 ` Ivaylo Dimitrov
2015-04-05 7:23 ` Ivaylo Dimitrov
2015-04-05 16:50 ` Matthijs van Duin
2015-04-05 16:50 ` Matthijs van Duin
2015-04-05 16:52 ` Matthijs van Duin
2015-04-05 16:52 ` Matthijs van Duin
2015-04-05 21:08 ` Ivaylo Dimitrov
2015-04-05 21:08 ` Ivaylo Dimitrov
2015-04-05 23:52 ` Matthijs van Duin
2015-04-05 23:52 ` Matthijs van Duin
2015-04-06 15:19 ` Tony Lindgren
2015-04-06 15:19 ` Tony Lindgren
2015-04-06 15:40 ` Tony Lindgren
2015-04-06 15:40 ` Tony Lindgren
2015-04-06 17:14 ` Ivaylo Dimitrov
2015-04-06 17:14 ` Ivaylo Dimitrov
2015-04-06 17:42 ` Tony Lindgren
2015-04-06 17:42 ` Tony Lindgren
2015-04-06 18:14 ` Matthijs van Duin
2015-04-06 18:14 ` Matthijs van Duin
2015-04-07 2:23 ` Tony Lindgren
2015-04-07 2:23 ` Tony Lindgren
2015-04-07 3:12 ` Sebastian Reichel
2015-04-07 3:12 ` Sebastian Reichel
2015-04-07 3:49 ` Matthijs van Duin
2015-04-07 3:49 ` Matthijs van Duin
2015-04-07 14:48 ` Tony Lindgren
2015-04-07 14:48 ` Tony Lindgren
2015-04-09 22:37 ` Grazvydas Ignotas [this message]
2015-04-09 22:37 ` Grazvydas Ignotas
2015-04-09 22:44 ` Tony Lindgren
2015-04-09 22:44 ` Tony Lindgren
2015-04-09 23:44 ` Nishanth Menon
2015-04-09 23:44 ` Nishanth Menon
2015-04-10 22:05 ` Grazvydas Ignotas
2015-04-10 22:05 ` Grazvydas Ignotas
2015-04-10 23:08 ` Tony Lindgren
2015-04-10 23:08 ` Tony Lindgren
2015-04-16 16:53 ` Matthijs van Duin
2015-04-16 16:53 ` Matthijs van Duin
2015-04-07 13:58 ` Russell King - ARM Linux
2015-04-07 13:58 ` Russell King - ARM Linux
2015-04-07 13:57 ` Russell King - ARM Linux
2015-04-07 13:57 ` Russell King - ARM Linux
2015-04-07 15:22 ` Tony Lindgren
2015-04-07 15:22 ` Tony Lindgren
2015-04-07 15:44 ` Tony Lindgren
2015-04-07 15:44 ` Tony Lindgren
2015-04-08 23:08 ` Russell King - ARM Linux
2015-04-08 23:08 ` Russell King - ARM Linux
2015-04-08 23:15 ` Tony Lindgren
2015-04-08 23:15 ` Tony Lindgren
2015-04-08 23:06 ` Russell King - ARM Linux
2015-04-08 23:06 ` Russell King - ARM Linux
2015-04-09 13:48 ` Russell King - ARM Linux
2015-04-09 13:48 ` Russell King - ARM Linux
2015-04-09 15:09 ` Tony Lindgren
2015-04-09 15:09 ` Tony Lindgren
2015-04-09 15:30 ` Russell King - ARM Linux
2015-04-09 15:30 ` Russell King - ARM Linux
2015-04-15 16:31 ` Sebastian Reichel
2015-04-15 16:31 ` Sebastian Reichel
2015-04-16 16:08 ` Tony Lindgren
2015-04-16 16:08 ` Tony Lindgren
2015-04-17 18:41 ` Sebastian Reichel
2015-04-17 18:41 ` Sebastian Reichel
2015-04-20 23:40 ` Tony Lindgren
2015-04-20 23:40 ` Tony Lindgren
2015-04-23 10:25 ` Russell King - ARM Linux
2015-04-23 10:25 ` Russell King - ARM Linux
2015-04-23 14:17 ` Tony Lindgren
2015-04-23 14:17 ` Tony Lindgren
2015-04-28 18:13 ` Russell King - ARM Linux
2015-04-28 18:13 ` Russell King - ARM Linux
2015-04-29 14:40 ` Tony Lindgren
2015-04-29 14:40 ` Tony Lindgren
2015-05-04 14:24 ` Tony Lindgren
2015-05-04 14:24 ` Tony Lindgren
2015-04-24 8:54 ` Matthijs van Duin
2015-04-24 8:54 ` Matthijs van Duin
2015-04-28 18:11 ` Russell King - ARM Linux
2015-04-28 18:11 ` Russell King - ARM Linux
2015-05-02 6:51 ` Matthijs van Duin
2015-05-02 6:51 ` Matthijs van Duin
2015-04-05 13:39 ` Sebastian Reichel
2015-04-05 13:39 ` Sebastian Reichel
2015-04-06 15:24 ` Tony Lindgren
2015-04-06 15:24 ` Tony Lindgren
2015-05-04 16:07 ` [PATCH RESEND] ARM: dts: OMAP3-N900: Add microphone bias voltages Tony Lindgren
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