linux-kernel - Re: [PATCH v6 04/16] PCI/AER: Extract bus/dev/fn in aer_print_port_info() with PCI_BUS

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Message-ID: <2889da2a-5cda-4a78-9457-864276c92410@linux.intel.com>
Date: Mon, 19 May 2025 16:47:17 -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 04/16] PCI/AER: Extract bus/dev/fn in
 aer_print_port_info() with PCI_BUS_NUM(), etc

On 5/19/25 2:35 PM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@...gle.com>
>
> Use PCI_BUS_NUM(), PCI_SLOT(), PCI_FUNC() to extract the bus number,
> device, and function number directly from the Error Source ID.  There's no
> need to shift and mask it explicitly.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---

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

>   drivers/pci/pcie/aer.c | 7 +++----
>   1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index b8494ccd935b..dc8a50e0a2b7 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -736,14 +736,13 @@ void aer_print_error(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;
> +	u16 source = info->id;
>   
>   	pci_info(dev, "%s%s error message received from %04x:%02x:%02x.%d%s\n",

Since it is used in many places in PCI driver, may be define

#define PCI_ADDR_FMT "%04x:%02x:%02x.%d"

>   		 info->multi_error_valid ? "Multiple " : "",
>   		 aer_error_severity_string[info->severity],
> -		 pci_domain_nr(dev->bus), bus, PCI_SLOT(devfn),
> -		 PCI_FUNC(devfn), details);
> +		 pci_domain_nr(dev->bus), PCI_BUS_NUM(source),
> +		 PCI_SLOT(source), PCI_FUNC(source), details);
>   }
>   
>   #ifdef CONFIG_ACPI_APEI_PCIEAER

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer