linux-kernel - Re: [PATCH V2 1/2] PCI/AER: Add pcie_is_ecrc

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Date:   Wed, 28 Oct 2020 10:47:55 +0800
From:   Ethan Zhao <xerces.zhao@...il.com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        lorenzo.pieralisi@....com, Bjorn Helgaas <bhelgaas@...gle.com>,
        amurray@...goodpenguin.co.uk, robh@...nel.org, treding@...dia.com,
        jonathanh@...dia.com, linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V2 1/2] PCI/AER: Add pcie_is_ecrc_enabled() API

On Wed, Oct 28, 2020 at 9:48 AM Vidya Sagar <vidyas@...dia.com> wrote:
>
> Adds pcie_is_ecrc_enabled() API to let other sub-systems (like DesignWare)
> to query if ECRC policy is enabled and perform any configuration
> required in those respective sub-systems.
>
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> V2:
> * None from V1
>
>  drivers/pci/pci.h      |  2 ++
>  drivers/pci/pcie/aer.c | 11 +++++++++++
>  2 files changed, 13 insertions(+)
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index fa12f7cbc1a0..325fdbf91dde 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -575,9 +575,11 @@ static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
>  #ifdef CONFIG_PCIE_ECRC
>  void pcie_set_ecrc_checking(struct pci_dev *dev);
>  void pcie_ecrc_get_policy(char *str);
> +bool pcie_is_ecrc_enabled(void);
>  #else
>  static inline void pcie_set_ecrc_checking(struct pci_dev *dev) { }
>  static inline void pcie_ecrc_get_policy(char *str) { }
> +static inline bool pcie_is_ecrc_enabled(void) { return false; }
>  #endif
>
>  #ifdef CONFIG_PCIE_PTM
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 65dff5f3457a..24363c895aba 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -207,6 +207,17 @@ void pcie_ecrc_get_policy(char *str)
>
>         ecrc_policy = i;
>  }
> +
> +/**
> + * pcie_is_ecrc_enabled - returns if ECRC is enabled in the system or not
> + *
> + * Returns 1 if ECRC policy is enabled and 0 otherwise
 How about 'Returns true if ECRC policy is enabled and false otherwise'  ?
> + */
> +bool pcie_is_ecrc_enabled(void)
> +{
> +       return ecrc_policy == ECRC_POLICY_ON;
> +}
> +EXPORT_SYMBOL(pcie_is_ecrc_enabled);
>  #endif /* CONFIG_PCIE_ECRC */
>
>  #define        PCI_EXP_AER_FLAGS       (PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
> --
> 2.17.1
>