Re: [RFC] [PATCH net-next v5 1/3] PCI/ASPM: Introduce a new helper to report ASPM capability
flat view
From: Bjorn Helgaas <helgaas@kernel.org>
Date: 2021-10-08 22:18:21
Also in:
linux-pci, lkml
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 <redacted>
Change subject to: PCI/ASPM: Add pcie_aspm_capable() Acked-by: Bjorn Helgaas <bhelgaas@google.com>
quoted hunk ↗ jump to hunk
--- 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