linux-kernel - Re: [PATCH v6 09/16] PCI/AER: Update statistics early in logging

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Message-ID: <92b8da5f-081d-4ca5-98f1-73d6bc3af743@linux.intel.com>
Date: Mon, 19 May 2025 18:32:13 -0700
From: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>
To: Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org
Cc: Jon Pan-Doh <pandoh@...gle.com>,
 Karolina Stolarek <karolina.stolarek@...cle.com>,
 Martin Petersen <martin.petersen@...cle.com>,
 Ben Fuller <ben.fuller@...cle.com>, Drew Walton <drewwalton@...rosoft.com>,
 Anil Agrawal <anilagrawal@...a.com>, Tony Luck <tony.luck@...el.com>,
 Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
 Lukas Wunner <lukas@...ner.de>,
 Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 Sargun Dhillon <sargun@...a.com>, "Paul E . McKenney" <paulmck@...nel.org>,
 Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
 Oliver O'Halloran <oohall@...il.com>, Kai-Heng Feng <kaihengf@...dia.com>,
 Keith Busch <kbusch@...nel.org>, Robert Richter <rrichter@....com>,
 Terry Bowman <terry.bowman@....com>, Shiju Jose <shiju.jose@...wei.com>,
 Dave Jiang <dave.jiang@...el.com>, linux-kernel@...r.kernel.org,
 linuxppc-dev@...ts.ozlabs.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v6 09/16] PCI/AER: Update statistics early in logging

On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> There are two AER logging entry points:
>
>    - aer_print_error() is used by DPC (dpc_process_error()) and native AER
>      handling (aer_process_err_devices()).
>
>    - pci_print_aer() is used by GHES (aer_recover_work_func()) and CXL
>      (cxl_handle_rdport_errors())
>
> Both use __aer_print_error() to print the AER error bits.  Previously
> __aer_print_error() also incremented the AER statistics via
> pci_dev_aer_stats_incr().
>
> Call pci_dev_aer_stats_incr() early in the entry points instead of in
> __aer_print_error() so we update the statistics even if the actual printing
> of error bits is rate limited by a future change.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---

Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

>   drivers/pci/pcie/aer.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 73d618354f6a..eb80c382187d 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -693,7 +693,6 @@ static void __aer_print_error(struct pci_dev *dev,
>   		aer_printk(level, dev, "   [%2d] %-22s%s\n", i, errmsg,
>   				info->first_error == i ? " (First)" : "");
>   	}
> -	pci_dev_aer_stats_incr(dev, info);
>   }
>   
>   static void aer_print_source(struct pci_dev *dev, struct aer_err_info *info,
> @@ -714,6 +713,8 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
>   	int id = pci_dev_id(dev);
>   	const char *level;
>   
> +	pci_dev_aer_stats_incr(dev, info);
> +
>   	if (!info->status) {
>   		pci_err(dev, "PCIe Bus Error: severity=%s, type=Inaccessible, (Unregistered Agent ID)\n",
>   			aer_error_severity_string[info->severity]);
> @@ -782,6 +783,8 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
>   	info.status = status;
>   	info.mask = mask;
>   
> +	pci_dev_aer_stats_incr(dev, &info);
> +
>   	layer = AER_GET_LAYER_ERROR(aer_severity, status);
>   	agent = AER_GET_AGENT(aer_severity, status);
>   

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer