linux-kernel - Re: [PATCH v8 13/20] PCI/ERR: Add printk level to pcie_print_tlp

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Message-ID: <ce537bc4-a302-4da5-2e65-0fb07c9e3e1d@linux.intel.com>
Date: Fri, 23 May 2025 12:56:35 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.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>, 
    Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...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>, LKML <linux-kernel@...r.kernel.org>, 
    linuxppc-dev@...ts.ozlabs.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v8 13/20] PCI/ERR: Add printk level to
 pcie_print_tlp_log()

On Thu, 22 May 2025, Bjorn Helgaas wrote:

> From: Bjorn Helgaas <bhelgaas@...gle.com>
> 
> aer_print_error() produces output at a printk level (KERN_ERR/KERN_WARNING/
> etc) that depends on the kind of error, and it calls pcie_print_tlp_log(),
> which previously always produced output at KERN_ERR.
> 
> Add a "level" parameter so aer_print_error() can control the level of the
> pcie_print_tlp_log() output to match.
> 
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
> ---
>  drivers/pci/pci.h      | 3 ++-
>  drivers/pci/pcie/aer.c | 5 +++--
>  drivers/pci/pcie/dpc.c | 2 +-
>  drivers/pci/pcie/tlp.c | 6 ++++--
>  4 files changed, 10 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 705f9ef58acc..1a9bfc708757 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -613,7 +613,8 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2,
>  		      struct pcie_tlp_log *log);
>  unsigned int aer_tlp_log_len(struct pci_dev *dev, u32 aercc);
>  void pcie_print_tlp_log(const struct pci_dev *dev,
> -			const struct pcie_tlp_log *log, const char *pfx);
> +			const struct pcie_tlp_log *log, const char *level,
> +			const char *pfx);
>  #endif	/* CONFIG_PCIEAER */
>  
>  #ifdef CONFIG_PCIEPORTBUS
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index f80c78846a14..f0936759ba8b 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -734,7 +734,7 @@ void aer_print_error(struct pci_dev *dev, struct aer_err_info *info)
>  	__aer_print_error(dev, info);
>  
>  	if (info->tlp_header_valid)
> -		pcie_print_tlp_log(dev, &info->tlp, dev_fmt("  "));
> +		pcie_print_tlp_log(dev, &info->tlp, level, dev_fmt("  "));
>  
>  out:
>  	if (info->id && info->error_dev_num > 1 && info->id == id)
> @@ -797,7 +797,8 @@ void pci_print_aer(struct pci_dev *dev, int aer_severity,
>  			aer->uncor_severity);
>  
>  	if (tlp_header_valid)
> -		pcie_print_tlp_log(dev, &aer->header_log, dev_fmt("  "));
> +		pcie_print_tlp_log(dev, &aer->header_log, info.level,
> +				   dev_fmt("  "));
>  }
>  EXPORT_SYMBOL_NS_GPL(pci_print_aer, "CXL");
>  
> diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> index 6c98fabdba57..7ae1590ea1da 100644
> --- a/drivers/pci/pcie/dpc.c
> +++ b/drivers/pci/pcie/dpc.c
> @@ -222,7 +222,7 @@ static void dpc_process_rp_pio_error(struct pci_dev *pdev)
>  			  dpc_tlp_log_len(pdev),
>  			  pdev->subordinate->flit_mode,
>  			  &tlp_log);
> -	pcie_print_tlp_log(pdev, &tlp_log, dev_fmt(""));
> +	pcie_print_tlp_log(pdev, &tlp_log, KERN_ERR, dev_fmt(""));
>  
>  	if (pdev->dpc_rp_log_size < PCIE_STD_NUM_TLP_HEADERLOG + 1)
>  		goto clear_status;
> diff --git a/drivers/pci/pcie/tlp.c b/drivers/pci/pcie/tlp.c
> index 890d5391d7f5..71f8fc9ea2ed 100644
> --- a/drivers/pci/pcie/tlp.c
> +++ b/drivers/pci/pcie/tlp.c
> @@ -98,12 +98,14 @@ int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2,
>   * pcie_print_tlp_log - Print TLP Header / Prefix Log contents
>   * @dev: PCIe device
>   * @log: TLP Log structure
> + * @level: Printk log level
>   * @pfx: String prefix
>   *
>   * Prints TLP Header and Prefix Log information held by @log.
>   */
>  void pcie_print_tlp_log(const struct pci_dev *dev,
> -			const struct pcie_tlp_log *log, const char *pfx)
> +			const struct pcie_tlp_log *log, const char *level,
> +			const char *pfx)
>  {
>  	/* EE_PREFIX_STR fits the extended DW space needed for the Flit mode */
>  	char buf[11 * PCIE_STD_MAX_TLP_HEADERLOG + 1];
> @@ -130,6 +132,6 @@ void pcie_print_tlp_log(const struct pci_dev *dev,
>  		}
>  	}
>  
> -	pci_err(dev, "%sTLP Header%s: %s\n", pfx,
> +	dev_printk(level, &dev->dev, "%sTLP Header%s: %s\n", pfx,
>  		log->flit ? " (Flit)" : "", buf);
>  }
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.