- 08:00.0 sent a PTM Request Message (a Posted Request)
- 00:1d.0 received the PTM Request Message
- The link transitioned to DL_Down
- Per sec 2.9.1, 00:1d.0 discarded the Request and reported an
Unsupported Request
- Or, per sec 6.21.3, if 00:1d.0 received a PTM Request when its
own PTM Enable was clear, it would also be treated as an
Unsupported Request
So I suspect we should disable PTM on 08:00.0 before putting it in a
low-power state. If you manually disable PTM on 08:00.0, do these
errors stop happening?
David did something like this [1], but just for Root Ports. That
looks wrong to me because sec 6.21.3 says we should not have PTM
enabled in an Upstream Port (i.e., in a downstream device like
08:00.0) unless it is already enabled in the Downstream Port (i.e., in
the Root Port 00:1d.0).
Nit: can you remove the timestamps from the log? They add clutter but
no useful information.
[1] https://git.kernel.org/linus/a697f072f5da
> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215453
> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> ---
> v4:
> - Explicitly states the spec version.
> - Wording change.
>
> v3:
> - Remove reference to ACS.
> - Wording change.
>
> v2:
> - Wording change.
>
> drivers/pci/pcie/aer.c | 31 +++++++++++++++++++++++++------
> 1 file changed, 25 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
> index 9fa1f97e5b270..e4e9d4a3098d7 100644
> --- a/drivers/pci/pcie/aer.c
> +++ b/drivers/pci/pcie/aer.c
> @@ -1367,6 +1367,22 @@ static int aer_probe(struct pcie_device *dev)
> return 0;
> }
>
> +static int aer_suspend(struct pcie_device *dev)
> +{
> + struct aer_rpc *rpc = get_service_data(dev);
> +
> + aer_disable_rootport(rpc);
> + return 0;
> +}
> +
> +static int aer_resume(struct pcie_device *dev)
> +{
> + struct aer_rpc *rpc = get_service_data(dev);
> +
> + aer_enable_rootport(rpc);
> + return 0;
> +}
> +
> /**
> * aer_root_reset - reset Root Port hierarchy, RCEC, or RCiEP
> * @dev: pointer to Root Port, RCEC, or RCiEP
> @@ -1433,12 +1449,15 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
> }
>
> static struct pcie_port_service_driver aerdriver = {
> - .name = "aer",
> - .port_type = PCIE_ANY_PORT,
> - .service = PCIE_PORT_SERVICE_AER,
> -
> - .probe = aer_probe,
> - .remove = aer_remove,
> + .name = "aer",
> + .port_type = PCIE_ANY_PORT,
> + .service = PCIE_PORT_SERVICE_AER,
> + .probe = aer_probe,
> + .suspend = aer_suspend,
> + .resume = aer_resume,
> + .runtime_suspend = aer_suspend,
> + .runtime_resume = aer_resume,
> + .remove = aer_remove,
> };
>
> /**
> --
> 2.34.1
>
