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PCI: Add Precision Time Measurement (PTM) support

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Add Precision Time Measurement (PTM) support (see PCIe r3.1, sec 6.22).

Enable PTM on PTM Root devices and switch ports.  This does not enable PTM
on endpoints.

There currently are no PTM-capable devices on the market, but it is
expected to be supported by the Intel Apollo Lake platform.

[bhelgaas: complete rework]
Signed-off-by: Jonathan Yong <jonathan.yong@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Jonathan Yong 2016-06-11 14:13:38 -05:00 • committed by Bjorn Helgaas
parent 29b4817d40
commit 9bb04a0c4e
7 changed files with 105 additions and 1 deletions
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5
include/linux/pci.h
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@ -367,6 +367,11 @@ struct pci_dev {
int rom_attr_enabled; /* has display of the rom attribute been enabled? */
struct bin_attribute *res_attr[DEVICE_COUNT_RESOURCE]; /* sysfs file for resources */
struct bin_attribute *res_attr_wc[DEVICE_COUNT_RESOURCE]; /* sysfs file for WC mapping of resources */
#ifdef CONFIG_PCIE_PTM
unsigned int ptm_root:1;
unsigned int ptm_enabled:1;
#endif
#ifdef CONFIG_PCI_MSI
const struct attribute_group **msi_irq_groups;
#endif