From: Stephen Warren <swarren-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
To: Joseph Lo <josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Cc: linux-tegra-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Subject: Re: [PATCH 0/6] ARM: tegra114: add CPU hotplug support
Date: Wed, 15 May 2013 17:38:00 -0600 [thread overview]
Message-ID: <51941C58.9060002@wwwdotorg.org> (raw)
In-Reply-To: <1368613644-11863-1-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
On 05/15/2013 04:27 AM, Joseph Lo wrote:
> Tegra 114 is different with other Tegra SoC chips. It using ARM Cortex-A15
> as CPU core and a enhanced flow controller for CPU power control. So
> we need to skip some code that was for Contex-A9 and some other support
> code that was for other Tegra SoC chips. Then adding the proper power up
> and hot plug control for Tegra114.
This series mostly works OK, but I see one problem: I can't hotunplug
CPU0, which the commit descriptions and code changes imply I should be
able to do:
root@localhost:~# echo 0 > /sys/devices/system/cpu/cpu0/online
-bash: echo: write error: Operation not permitted
WARNING: multiple messages have this Message-ID (diff)
From: swarren@wwwdotorg.org (Stephen Warren)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/6] ARM: tegra114: add CPU hotplug support
Date: Wed, 15 May 2013 17:38:00 -0600 [thread overview]
Message-ID: <51941C58.9060002@wwwdotorg.org> (raw)
In-Reply-To: <1368613644-11863-1-git-send-email-josephl@nvidia.com>
On 05/15/2013 04:27 AM, Joseph Lo wrote:
> Tegra 114 is different with other Tegra SoC chips. It using ARM Cortex-A15
> as CPU core and a enhanced flow controller for CPU power control. So
> we need to skip some code that was for Contex-A9 and some other support
> code that was for other Tegra SoC chips. Then adding the proper power up
> and hot plug control for Tegra114.
This series mostly works OK, but I see one problem: I can't hotunplug
CPU0, which the commit descriptions and code changes imply I should be
able to do:
root at localhost:~# echo 0 > /sys/devices/system/cpu/cpu0/online
-bash: echo: write error: Operation not permitted
next prev parent reply other threads:[~2013-05-15 23:38 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-15 10:27 [PATCH 0/6] ARM: tegra114: add CPU hotplug support Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-1-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 10:27 ` [PATCH 1/6] ARM: tegra: add an assembly marco to check Tegra SoC ID Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-2-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 22:43 ` Stephen Warren
2013-05-15 22:43 ` Stephen Warren
[not found] ` <51940FA4.6050609-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-16 10:09 ` Joseph Lo
2013-05-16 10:09 ` Joseph Lo
[not found] ` <1368698988.7403.25.camel-yx3yKKdKkHfc7b1ADBJPm0n48jw8i0AO@public.gmane.org>
2013-05-16 18:21 ` Stephen Warren
2013-05-16 18:21 ` Stephen Warren
2013-05-15 10:27 ` [PATCH 2/6] ARM: tegra: skip SCU and PL310 code when CPU is not Cortex-A9 Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-3-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 22:48 ` Stephen Warren
2013-05-15 22:48 ` Stephen Warren
[not found] ` <519410D7.9060201-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-16 10:13 ` Joseph Lo
2013-05-16 10:13 ` Joseph Lo
2013-05-15 10:27 ` [PATCH 3/6] ARM: tegra: make tegra_resume can work for Tegra114 Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-4-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 22:57 ` Stephen Warren
2013-05-15 22:57 ` Stephen Warren
[not found] ` <519412E9.2080905-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-16 10:35 ` Joseph Lo
2013-05-16 10:35 ` Joseph Lo
[not found] ` <1368700533.7403.47.camel-yx3yKKdKkHfc7b1ADBJPm0n48jw8i0AO@public.gmane.org>
2013-05-16 18:24 ` Stephen Warren
2013-05-16 18:24 ` Stephen Warren
2013-05-15 10:27 ` [PATCH 4/6] ARM: tegra114: add power up sequence for warm boot CPU Joseph Lo
2013-05-15 10:27 ` Joseph Lo
2013-05-15 10:27 ` [PATCH 5/6] clk: tegra114: implement wait_for_reset and disable_clock for tegra_cpu_car_ops Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-6-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 23:02 ` Stephen Warren
2013-05-15 23:02 ` Stephen Warren
2013-05-16 19:17 ` Mike Turquette
2013-05-16 19:17 ` Mike Turquette
2013-05-15 10:27 ` [PATCH 6/6] ARM: tegra114: add CPU hotplug support Joseph Lo
2013-05-15 10:27 ` Joseph Lo
[not found] ` <1368613644-11863-7-git-send-email-josephl-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
2013-05-15 23:11 ` Stephen Warren
2013-05-15 23:11 ` Stephen Warren
[not found] ` <5194162D.7010007-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-16 11:14 ` Joseph Lo
2013-05-16 11:14 ` Joseph Lo
[not found] ` <1368702862.7403.86.camel-yx3yKKdKkHfc7b1ADBJPm0n48jw8i0AO@public.gmane.org>
2013-05-16 18:26 ` Stephen Warren
2013-05-16 18:26 ` Stephen Warren
2013-05-15 23:38 ` Stephen Warren [this message]
2013-05-15 23:38 ` [PATCH 0/6] " Stephen Warren
[not found] ` <51941C58.9060002-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-16 9:53 ` Joseph Lo
2013-05-16 9:53 ` Joseph Lo
[not found] ` <1368698019.7403.10.camel-yx3yKKdKkHfc7b1ADBJPm0n48jw8i0AO@public.gmane.org>
2013-05-16 18:19 ` Stephen Warren
2013-05-16 18:19 ` Stephen Warren
[not found] ` <51952344.1090003-3lzwWm7+Weoh9ZMKESR00Q@public.gmane.org>
2013-05-17 10:15 ` Joseph Lo
2013-05-17 10:15 ` Joseph Lo
2013-05-17 10:27 ` Russell King - ARM Linux
2013-05-17 10:27 ` Russell King - ARM Linux
2013-05-17 10:23 ` Russell King - ARM Linux
2013-05-17 10:23 ` Russell King - ARM Linux
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