On Mon, May 05, 2025 at 01:37:14PM -0500, Bjorn Helgaas wrote: > 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. > Added this info while applying the series, thanks! - Mani -- மணிவண்ணன் சதாசிவம்
