[lkml]   [2018]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH net-next v2 1/2] fs/crashdd: add API to collect hardware dump in second kernel
Fri, Mar 30, 2018 at 08:42:00PM CEST, wrote:
>Rahul Lakkireddy <> writes:
>> On Friday, March 03/30/18, 2018 at 16:09:07 +0530, Jiri Pirko wrote:
>>> Sat, Mar 24, 2018 at 11:56:33AM CET, wrote:
>>> >Add a new module crashdd that exports the /sys/kernel/crashdd/
>>> >directory in second kernel, containing collected hardware/firmware
>>> >dumps.
>>> >
>>> >The sequence of actions done by device drivers to append their device
>>> >specific hardware/firmware logs to /sys/kernel/crashdd/ directory are
>>> >as follows:
>>> >
>>> >1. During probe (before hardware is initialized), device drivers
>>> >register to the crashdd module (via crashdd_add_dump()), with
>>> >callback function, along with buffer size and log name needed for
>>> >firmware/hardware log collection.
>>> >
>>> >2. Crashdd creates a driver's directory under
>>> >/sys/kernel/crashdd/<driver>. Then, it allocates the buffer with
>>> This smells. I need to identify the exact ASIC instance that produced
>>> the dump. To identify by driver name does not help me if I have multiple
>>> instances of the same driver. This looks wrong to me. This looks like
>>> a job for devlink where you have 1 devlink instance per 1 ASIC instance.
>>> Please see:
>>> I bevieve that the solution in the patchset could be used for
>>> your usecase too.
>> The sysfs approach proposed here had been dropped in favour exporting
>> the dumps as ELF notes in /proc/vmcore.
>> Will be posting the new patches soon.
>The concern was actually how you identify which device that came from.
>Where you read the identifier changes but sysfs or /proc/vmcore the
>change remains valid.

Yeah. I still don't see how you link the dump and the device. Rahul, did
you look at the patchset I pointed out?

 \ /
  Last update: 2018-04-02 11:12    [W:0.108 / U:1.200 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site