[PATCH] klog.json: add an "Unable ... IOMMU perf counter" message

[Paul Menzel]

Dear Alex,


Am 31.03.20 um 03:21 schrieb Alex Hung:
> This message shows performance counters are not supported on AMD IOMMU
> hardware.
> 
> Reported-by: Paul Menzel <pmenzel at molgen.mpg.de>
> Signed-off-by: Alex Hung <alex.hung at canonical.com>
> ---
>   data/klog.json | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/data/klog.json b/data/klog.json
> index 15043658..eb78fe47 100644
> --- a/data/klog.json
> +++ b/data/klog.json
> @@ -2697,6 +2697,13 @@ atform Communications Channel Table (PCCT) and find the PCC subspace communicati
>       "advice": "BIOS setup is configured to enable IOMMU, but BIOS lacks IVRS table that is describing which is the address of IOMMU",
>       "label": "KlogAmdIommuNoIVRS"
>     },
> +  {
> +    "compare_mode": "string",
> +    "log_level": "LOG_LEVEL_MEDIUM",
> +    "pattern": "Unable to read/write to IOMMU perf counter",
> +    "advice": "AMD IOMMU performance counter is not accessible and not supported due to firmware limitations.",

By the way,

https://lore.kernel.org/lkml/20180727102710.GA6738@8bytes.org/

lists the maintainers answer. Maybe the advice can be more direct.

> AMD IOMMU performance counter is not accessible due to a bug in the system firmware.

> +    "label": "KlogAmdIommuPCNotSupported"
> +  },
>     {
>       "compare_mode": "string",
>       "log_level": "LOG_LEVEL_HIGH",

Tested-by: Paul Menzel <pmenzel at molgen.mpg.de>


Kind regards,

Paul