On Fri, Oct 08, 2021 at 12:15:50AM +0800, Kai-Heng Feng wrote:
> Introduce a new helper, pcie_aspm_capable(), to report ASPM capability.
>
> The user will be introduced by next patch.
>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
Change subject to:
PCI/ASPM: Add pcie_aspm_capable()
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
> ---
> v6:
> v5:
> - No change.
>
> v4:
> - Report aspm_capable instead.
>
> v3:
> - This is a new patch
>
> drivers/pci/pcie/aspm.c | 11 +++++++++++
> include/linux/pci.h | 2 ++
> 2 files changed, 13 insertions(+)
>
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 013a47f587cea..788e7496f33b1 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -1201,6 +1201,17 @@ bool pcie_aspm_enabled(struct pci_dev *pdev)
> }
> EXPORT_SYMBOL_GPL(pcie_aspm_enabled);
>
> +bool pcie_aspm_capable(struct pci_dev *pdev)
> +{
> + struct pcie_link_state *link = pcie_aspm_get_link(pdev);
> +
> + if (!link)
> + return false;
> +
> + return link->aspm_capable;
> +}
> +EXPORT_SYMBOL_GPL(pcie_aspm_capable);
> +
> static ssize_t aspm_attr_show_common(struct device *dev,
> struct device_attribute *attr,
> char *buf, u8 state)
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index cd8aa6fce2041..a17baa39141f4 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1639,6 +1639,7 @@ int pci_disable_link_state_locked(struct pci_dev *pdev, int state);
> void pcie_no_aspm(void);
> bool pcie_aspm_support_enabled(void);
> bool pcie_aspm_enabled(struct pci_dev *pdev);
> +bool pcie_aspm_capable(struct pci_dev *pdev);
> #else
> static inline int pci_disable_link_state(struct pci_dev *pdev, int state)
> { return 0; }
> @@ -1647,6 +1648,7 @@ static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state)
> static inline void pcie_no_aspm(void) { }
> static inline bool pcie_aspm_support_enabled(void) { return false; }
> static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; }
> +static inline bool pcie_aspm_capable(struct pci_dev *pdev) { return false; }
> #endif
>
> #ifdef CONFIG_PCIEAER
> --
> 2.32.0
>
