Introduce a new helper, pcie_aspm_capable(), to report ASPM capability.
The user will be introduced by next patch.
Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
---
v8:
- No change.
v7:
- Change subject.
v6:
- No change.
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 692d6953f0970..d96bf0a362aa2 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1199,6 +1199,17 @@ 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 adffd65e84b4e..fd56872883e14 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1692,6 +1692,7 @@ 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; }
@@ -1700,6 +1701,7 @@ 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
--
2.34.1
