linux-kernel - Re: [PATCH v7 04/17] PCI/AER: Consolidate Error Source ID logging in aer_isr_one_error

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Message-ID: <20250521102041.00004901@huawei.com>
Date: Wed, 21 May 2025 10:20:41 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Bjorn Helgaas <helgaas@...nel.org>
CC: <linux-pci@...r.kernel.org>, Jon Pan-Doh <pandoh@...gle.com>, "Karolina
 Stolarek" <karolina.stolarek@...cle.com>, Weinan Liu <wnliu@...gle.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>, Sathyanarayanan
 Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>, Lukas Wunner
	<lukas@...ner.de>, 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 v7 04/17] PCI/AER: Consolidate Error Source ID logging
 in aer_isr_one_error_type()

On Tue, 20 May 2025 16:50:21 -0500
Bjorn Helgaas <helgaas@...nel.org> wrote:

> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> Previously we decoded the AER Error Source ID in aer_isr_one_error_type(),
> then again in find_source_device() if we didn't find any devices with
> errors logged in their AER Capabilities.
> 
> Consolidate this so we only decode and log the Error Source ID once in
> aer_isr_one_error_type().  Add a "details" parameter so we can add a note
> when we didn't find any downstream devices with errors logged in their AER
> Capability.
> 
> This changes the dmesg logging when we found no devices with errors logged:
> 
>   - pci 0000:00:01.0: AER: Correctable error message received from 0000:02:00.0
>   - pci 0000:00:01.0: AER: found no error details for 0000:02:00.0
>   + pci 0000:00:01.0: AER: Correctable error message received from 0000:02:00.0 (no details found)
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>

Nice little improvement.  I'll assume you reuse
details later as otherwise passing a bool and creating
the (no details found) in aer_print_port_info() would
have been simpler to my eyes as it would have put all the
string generation in one place.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
>  drivers/pci/pcie/aer.c | 22 +++++++++-------------
>  1 file changed, 9 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 568229288ca3..488a6408c7a8 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -733,16 +733,17 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
>  			info->severity, info->tlp_header_valid, &info->tlp);
>  }
>  
> -static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info)
> +static void aer_print_port_info(struct pci_dev *dev, struct aer_err_info *info,
> +				const char *details)
>  {
>  	u8 bus = info->id >> 8;
>  	u8 devfn = info->id & 0xff;
>  
> -	pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d\n",
> +	pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d%s\n",
>  		 info->multi_error_valid ? "Multiple " : "",
>  		 aer_error_severity_string[info->severity],
>  		 pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn),
> -		 PCI_FUNC(devfn));
> +		 PCI_FUNC(devfn), details);
>  }
>  
>  #ifdef CONFIG_ACPI_APEI_PCIEAER
> @@ -926,15 +927,8 @@ static bool find_source_device(struct pci_dev *parent,
>  	else
>  		pci_walk_bus(parent->subordinate, find_device_iter, e_info);
>  
> -	if (!e_info->error_dev_num) {
> -		u8 bus = e_info->id >> 8;
> -		u8 devfn = e_info->id & 0xff;
> -
> -		pci_info(parent, "found no error details for %04x:%02x:%02x.%d\n",
> -			 pci_domain_nr(parent->bus), bus, PCI_SLOT(devfn),
> -			 PCI_FUNC(devfn));
> +	if (!e_info->error_dev_num)
>  		return false;
> -	}
>  	return true;
>  }
>  
> @@ -1281,9 +1275,11 @@ static inline void aer_process_err_devices(struct aer_err_info *e_info)
>  static void aer_isr_one_error_type(struct pci_dev *root,
>  				   struct aer_err_info *info)
>  {
> -	aer_print_port_info(root, info);
> +	bool found;
>  
> -	if (find_source_device(root, info))
> +	found = find_source_device(root, info);
> +	aer_print_port_info(root, info, found ? "" : " (no details found");
> +	if (found)
>  		aer_process_err_devices(info);
>  }
>