linux-kernel - Re: [PATCH v4 18/23] PCI/AER: Refactor cper_print

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Date:   Wed, 24 May 2023 11:55:18 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Terry Bowman <terry.bowman@....com>
Cc:     alison.schofield@...el.com, vishal.l.verma@...el.com,
        ira.weiny@...el.com, bwidawsk@...nel.org, dan.j.williams@...el.com,
        dave.jiang@...el.com, Jonathan.Cameron@...wei.com,
        linux-cxl@...r.kernel.org, rrichter@....com,
        linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        Oliver O'Halloran <oohall@...il.com>, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 18/23] PCI/AER: Refactor cper_print_aer() for use by
 CXL driver module

On Tue, May 23, 2023 at 06:22:09PM -0500, Terry Bowman wrote:
> The CXL driver plans to use cper_print_aer() for logging restricted CXL
> host (RCH) AER errors. cper_print_aer() is not currently exported and
> therefore not usable by the CXL driver built as a loadable module. Export
> the cper_print_aer() function making it available.
> 
> The CONFIG_ACPI_APEI_PCIEAER kernel config is currently used to enable
> cper_print_aer(). cper_print_aer() logs the AER registers and is
> useful in PCIE AER logging outside of APEI. Remove the
> CONFIG_ACPI_APEI_PCIEAER dependency to enable cper_print_aer().
> 
> The cper_print_aer() function name implies CPER specific use but is useful
> in non-CPER cases as well. Rename cper_print_aer() to pci_print_aer().
> 
> Co-developed-by: Robert Richter <rrichter@....com>
> Signed-off-by: Robert Richter <rrichter@....com>
> Signed-off-by: Terry Bowman <terry.bowman@....com>
> Cc: Mahesh J Salgaonkar <mahesh@...ux.ibm.com>
> Cc: "Oliver O'Halloran" <oohall@...il.com>
> Cc: Bjorn Helgaas <bhelgaas@...gle.com>
> Cc: linux-pci@...r.kernel.org
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/pcie/aer.c | 9 +++++----
>  include/linux/aer.h    | 2 +-
>  2 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index f6c24ded134c..d3344fcf1f79 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -771,9 +771,10 @@ int cper_severity_to_aer(int cper_severity)
>  	}
>  }
>  EXPORT_SYMBOL_GPL(cper_severity_to_aer);
> +#endif
>  
> -void cper_print_aer(struct pci_dev *dev, int aer_severity,
> -		    struct aer_capability_regs *aer)
> +void pci_print_aer(struct pci_dev *dev, int aer_severity,
> +		   struct aer_capability_regs *aer)
>  {
>  	int layer, agent, tlp_header_valid = 0;
>  	u32 status, mask;
> @@ -812,7 +813,7 @@ void cper_print_aer(struct pci_dev *dev, int aer_severity,
>  	trace_aer_event(dev_name(&dev->dev), (status & ~mask),
>  			aer_severity, tlp_header_valid, &aer->header_log);
>  }
> -#endif
> +EXPORT_SYMBOL_NS_GPL(pci_print_aer, CXL);
>  
>  /**
>   * add_error_device - list device to be handled
> @@ -1009,7 +1010,7 @@ static void aer_recover_work_func(struct work_struct *work)
>  			       PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
>  			continue;
>  		}
> -		cper_print_aer(pdev, entry.severity, entry.regs);
> +		pci_print_aer(pdev, entry.severity, entry.regs);
>  		if (entry.severity == AER_NONFATAL)
>  			pcie_do_recovery(pdev, pci_channel_io_normal,
>  					 aer_root_reset);
> diff --git a/include/linux/aer.h b/include/linux/aer.h
> index 97f64ba1b34a..8f124b904314 100644
> --- a/include/linux/aer.h
> +++ b/include/linux/aer.h
> @@ -64,7 +64,7 @@ static inline void pci_save_aer_state(struct pci_dev *dev) {}
>  static inline void pci_restore_aer_state(struct pci_dev *dev) {}
>  #endif
>  
> -void cper_print_aer(struct pci_dev *dev, int aer_severity,
> +void pci_print_aer(struct pci_dev *dev, int aer_severity,
>  		    struct aer_capability_regs *aer);
>  int cper_severity_to_aer(int cper_severity);
>  void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
> -- 
> 2.34.1
>