Hi,

On 03/06/2015 03:54 AM, Mark Rutland wrote:

Hi,

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+       psci {
+               compatible = "arm,psci";
+               method = "smc";
+               cpu_off = <0x84000002>;
+               cpu_on = <0xC4000003>;
+       };

Back at v2 you mentioned that CPU_OFF wasn't working [1].

Do both CPU_ON and CPU_OFF work for all CPUs, including the boot CPU?

The CPU1 ~ CPU7 are well woking about CPU_ON/OFF.
CPU0 (boot CPU) is only well working for CPU_OFF.
But when I try to turn on the CPU0 after CPU_OFF, I failed it.

That's rather worrying. Can you look into what's going on here? I'd
rather not have dts describing things which are known to be broken.

The board dts don't include any node for CPU_ON/OFF.

I don't understand. The CPU_ON and CPU_OFF IDs are in the psci node
quoted above, and all the CPUs had enable-method = "psci".

I mean that there are not additional dt node except for 'cpu' and 'psci' node.

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When I try to turn on the CPU0 (boot CPU), fail to turn on and lockup happen.
After lockup happen, I cannot use the console.

That sounds like a pretty major bug.

Are you able to investigate with a hardware debugger?

I can't do because there are not any jtag connector.

Do other CPUs eventually log errors regarding the lockup? Or is the
machine completely dead from this point on?

I tested CPU0 on/off. When I turn on the CPU0, I fail it. But, kernel just show the error log without lockup.
I gave you wrong infromation about CPU0 off.

[test result of CPU0 on/off on Linux 4.0-rc2]
root@localhost:~# echo 0 > /sys/devices/system/cpu/cpu0/online 
[  420.965435] IRQ1 no longer affine to CPU0
[  420.965439] IRQ2 no longer affine to CPU0
[ 4631.194227] CPU0: shutdown
root@localhost:~# echo 1 > /sys/devices/system/cpu/cpu0/online
[ 1164.601644] CPU0: failed to come online
-bash: echo: write error: Input/output error

As I experienced, Exynos SoC could not turn off the CPU0 (boot cpu).
I think that we may need the hidden information of Exynos5433 from Exynos5433 architector.

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I take it CPUs boot at EL2?

Do the CPUs boot at EL1 or EL2?

Unfortunately, I cannot check the secure firmware for Exynos5433 SoC.
I think that a few SoC provider probably would know it.

I guess I asked the wrong question.

Do CPUs enter the kernel at EL2 or at EL1?

Could you give me a tip how to check the kernel at EL2 or EL1?

Thanks,
Chanwoo Choi


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