On Mon, May 05, 2025 at 07:54:39PM +0530, Manivannan Sadhasivam wrote: > Precision Time Management (PTM) mechanism defined in PCIe spec r6.0, > sec 6.21 allows precise coordination of timing information across multiple > components in a PCIe hierarchy with independent local time clocks. > > PCI core already supports enabling PTM in the root port and endpoint > devices through PTM Extended Capability registers. But the PTM context > supported by the PTM capable components such as Root Complex (RC) and > Endpoint (EP) controllers were not exposed as of now. IIUC, the PCIe spec defines the PTM link protocol in terms of these timestamps, but it does not provide any visibility of them to software, so any visibility is device-specific. I think it's worth mentioning something to this effect. Bjorn
