linux-kernel - Re: [PATCH v6 0/3] PCI: Precision Time Measurement support

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Date:   Tue, 23 Aug 2016 16:42:54 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     Jonathan Yong <jonathan.yong@...el.com>, linux-pci@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 0/3] PCI: Precision Time Measurement support

On Mon, Jun 13, 2016 at 02:05:26PM -0500, Bjorn Helgaas wrote:
> This is a slightly different proposal for the PTM support Jonathan
> proposed here:
> 
>   http://lkml.kernel.org/r/1462956446-27361-2-git-send-email-jonathan.yong@intel.com
> 
> I split this into three pieces mostly for ease in reviewing.  They
> could all be squashed:
> 
>   - Enable PTM in root ports and switches automatically at boot
>   - Enable PTM in endpoints when requested by driver
>   - Add clock granularity information
> 
> I have some open questions about how PTM works on Root Complex
> Integrated Endpoints and whether we should enable it automatically
> even without a driver request.  And I probably left out some details
> of the clock granularity computation, so treat this as more of an RFC
> than anything.
> 
> Bjorn
> 
> ---
> 
> Bjorn Helgaas (2):
>       PCI: Add pci_enable_ptm() for drivers to enable PTM on endpoints
>       PCI: Add PTM clock granularity information
> 
> Jonathan Yong (1):
>       PCI: Add Precision Time Measurement (PTM) support
> 
> 
>  drivers/pci/pci.h             |    6 ++
>  drivers/pci/pcie/Kconfig      |   12 ++++
>  drivers/pci/pcie/Makefile     |    1 
>  drivers/pci/pcie/ptm.c        |  140 +++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/probe.c           |    3 +
>  include/linux/pci.h           |   13 ++++
>  include/uapi/linux/pci_regs.h |   12 +++-
>  7 files changed, 186 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/pci/pcie/ptm.c

These are on pci/ptm and queued for v4.9.