kexec failures on ipq4019

Andy Strohman andy at uplevelsystems.com
Tue Jun 26 14:17:54 PDT 2018


On Sun, Jun 17, 2018 at 11:31 PM,  <sricharan at codeaurora.org> wrote:
> Hi Andy,
>
> On 2018-06-16 06:37, Andy Strohman wrote:
>>
>> Hi,
>>
>>   I'm trying to get kexec to work consistently for ipq4019.  I load
>> the crash kernel like this:
>>
>> kexec --type zImage -p zImage-initramfs
>> --dtb=image-qcom-ipq4019-eap1300.dtb --append="maxcpus=1
>> reset_devices" --image-size=34419456
>>
>>   I have reserved 64MB of memory for the crash kernel with parameter:
>> crashkernel=64M
>>
>>   This seems to work ~70% of the time. When it doesn't work, I see the
>> "bye!" message followed by a 5-10 second hang without output.  Then
>> the machine resets.
>>
>>   I've been testing with:
>> echo c > /proc/sysrq-trigger
>>
>>   Does anyone have an idea of what may be causing the failures or how
>> to troubleshoot this?
>>
>
>  I will try to reproduce this and get back to you shortly.
>
> Regards,
>  Sricharan
>
>
>>   I'm using OpenWRT with kernel 4.14.37.   I added the following patch
>> in order to load the crash kernel:
>>
>> --- a/arch/arm/mach-qcom/platsmp.c
>> +++ b/arch/arm/mach-qcom/platsmp.c
>> @@ -332,6 +332,12 @@ static void __init qcom_smp_prepare_cpus
>>   }
>>  }
>>
>> +/* Needed by kexec and platform_can_cpu_hotplug() */
>> +int qcom_cpu_kill(unsigned int cpu)
>> +{
>> +    return 1;
>> +}
>> +
>>  static const struct smp_operations smp_msm8660_ops __initconst = {
>>   .smp_prepare_cpus = qcom_smp_prepare_cpus,
>>   .smp_secondary_init = qcom_secondary_init,
>> @@ -358,6 +364,7 @@ static const struct smp_operations qcom_
>>   .smp_boot_secondary = kpssv2_boot_secondary,
>>  #ifdef CONFIG_HOTPLUG_CPU
>>   .cpu_die = qcom_cpu_die,
>> +    .cpu_kill       = qcom_cpu_kill,
>>  #endif
>>  };
>>  CPU_METHOD_OF_DECLARE(qcom_smp_kpssv2, "qcom,kpss-acc-v2",
>> &qcom_smp_kpssv2_ops);
>>
>>
>> Thanks,
>>
>> Andy

Hi Sricharan,

  Thanks for your response.  Did you get a chance to try this out?  If
so, were you able to reproduce?

Thanks,

Andy

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