linux-kernel - Re: [PATCH v2 1/9] PCI/AER: Add pci_aer_clear_uncorrect_error

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Date:   Tue, 27 Sep 2022 12:31:48 -0700
From:   Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Zhuo Chen <chenzhuo.1@...edance.com>, bhelgaas@...gle.com,
        ruscur@...sell.cc, oohall@...il.com, fancer.lancer@...il.com,
        jdmason@...zu.us, dave.jiang@...el.com, allenbh@...il.com,
        james.smart@...adcom.com, dick.kennedy@...adcom.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, ntb@...ts.linux.dev,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v2 1/9] PCI/AER: Add
 pci_aer_clear_uncorrect_error_status() to PCI core

Hi,

On 9/27/22 8:35 AM, Zhuo Chen wrote:
> Sometimes we need to clear aer uncorrectable error status, so we add

Adding n actual use case will help.

> pci_aer_clear_uncorrect_error_status() to PCI core.

If possible, try to avoid "we" usage in commit log. Just say "so add
pci_aer_clear_uncorrect_error_status() function" 

> 
> Signed-off-by: Zhuo Chen <chenzhuo.1@...edance.com>
> ---
>  drivers/pci/pcie/aer.c | 16 ++++++++++++++++
>  include/linux/aer.h    |  5 +++++
>  2 files changed, 21 insertions(+)
> 
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index e2d8a74f83c3..4e637121be23 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -286,6 +286,22 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
>  		pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
>  }
>  
> +int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
> +{
> +	int aer = dev->aer_cap;
> +	u32 status;
> +
> +	if (!pcie_aer_is_native(dev))
> +		return -EIO;
> +
> +	pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
> +	if (status)
> +		pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);

Why not just write all '1' and clear it? Why read and write?

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(pci_aer_clear_uncorrect_error_status);

Add details about why you want to export in commit log.

> +
>  /**
>   * pci_aer_raw_clear_status - Clear AER error registers.
>   * @dev: the PCI device
> diff --git a/include/linux/aer.h b/include/linux/aer.h
> index 97f64ba1b34a..154690c278cb 100644
> --- a/include/linux/aer.h
> +++ b/include/linux/aer.h
> @@ -45,6 +45,7 @@ struct aer_capability_regs {
>  int pci_enable_pcie_error_reporting(struct pci_dev *dev);
>  int pci_disable_pcie_error_reporting(struct pci_dev *dev);
>  int pci_aer_clear_nonfatal_status(struct pci_dev *dev);
> +int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev);
>  void pci_save_aer_state(struct pci_dev *dev);
>  void pci_restore_aer_state(struct pci_dev *dev);
>  #else
> @@ -60,6 +61,10 @@ static inline int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
>  {
>  	return -EINVAL;
>  }
> +static inline int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
> +{
> +	return -EINVAL;
> +}
>  static inline void pci_save_aer_state(struct pci_dev *dev) {}
>  static inline void pci_restore_aer_state(struct pci_dev *dev) {}
>  #endif

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer