diff mbox series

[next-queue,v6,2/4] PCI: Add pcie_ptm_enabled()

Message ID 20210727033657.39885-3-vinicius.gomes@intel.com (mailing list archive)
State Not Applicable
Delegated to: Bjorn Helgaas
Headers show
Series igc: Add support for PCIe PTM | expand

Commit Message

Vinicius Costa Gomes July 27, 2021, 3:36 a.m. UTC 
Add a predicate that returns if PCIe PTM (Precision Time Measurement)
is enabled.

It will only return true if it's enabled in all the ports in the path
from the device to the root.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/pcie/ptm.c | 9 +++++++++
 include/linux/pci.h    | 3 +++
 2 files changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/pcie/ptm.c b/drivers/pci/pcie/ptm.c
index 95d4eef2c9e8..8a4ad974c5ac 100644
--- a/drivers/pci/pcie/ptm.c
+++ b/drivers/pci/pcie/ptm.c
@@ -204,3 +204,12 @@  int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
 	return 0;
 }
 EXPORT_SYMBOL(pci_enable_ptm);
+
+bool pcie_ptm_enabled(struct pci_dev *dev)
+{
+	if (!dev)
+		return false;
+
+	return dev->ptm_enabled;
+}
+EXPORT_SYMBOL(pcie_ptm_enabled);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 21a9d244e4e4..947430637cac 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1622,9 +1622,12 @@  bool pci_ats_disabled(void);
 
 #ifdef CONFIG_PCIE_PTM
 int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
+bool pcie_ptm_enabled(struct pci_dev *dev);
 #else
 static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
 { return -EINVAL; }
+static inline bool pcie_ptm_enabled(struct pci_dev *dev)
+{ return false; }
 #endif
 
 void pci_cfg_access_lock(struct pci_dev *dev);