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PCI: Add pcie_ptm_enabled()

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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>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2021-07-26 20:36:55 -07:00 • committed by Tony Nguyen
parent 1d71eb53e4
commit 014408cd62
2 changed files with 12 additions and 0 deletions
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9
drivers/pci/pcie/ptm.c
View file

@ -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);

3
include/linux/pci.h
View file

@ -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);