Commit 014408cd authored by Vinicius Costa Gomes's avatar Vinicius Costa Gomes Committed by Tony Nguyen
Browse files

PCI: Add pcie_ptm_enabled() 



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: default avatarVinicius Costa Gomes <vinicius.gomes@intel.com>
Acked-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: default avatarTony Nguyen <anthony.l.nguyen@intel.com>
parent 1d71eb53

drivers/pci/pcie/ptm.c

+9 −0
Original line number Diff line number Diff line
@@ -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);

include/linux/pci.h

+3 −0
Original line number Diff line number Diff line
@@ -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);