linux-kernel - Re: [PATCH] PCI: Check for PCIe downtraining conditions

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Message-ID: <093b2789-39a1-db9e-5783-b0488b3c9ccd@gmail.com>
Date:   Thu, 31 May 2018 11:01:45 -0500
From:   "Alex G." <mr.nuke.me@...il.com>
To:     Sinan Kaya <okaya@...eaurora.org>, Alex_Gagniuc@...lteam.com,
        bhelgaas@...gle.com
Cc:     Austin.Bolen@...l.com, Shyam.Iyer@...l.com, keith.busch@...el.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: Check for PCIe downtraining conditions



On 05/31/2018 10:54 AM, Sinan Kaya wrote:
> On 5/31/2018 11:46 AM, Alex G. wrote:
>>> https://lkml.org/lkml/2018/3/30/553
>> Oh, pcie_get_speed_cap()/pcie_get_width_cap() seems to handle the
>> capability. Not seeing one for status and speed name.
>>
>>> are you working on linux-next?
>> v4.17-rc7
>>
> 
> I think everything you need is in the series. I don't know which linux
> tree this landed or if it landed. Probably, it is shipping for 4.18. 
> Need some help from Bjorn where to locate these.
> 
> Fri, 30 Mar 2018 16:04:40 -0500
> 
> Bjorn Helgaas (6):
>       bnx2x: Report PCIe link properties with pcie_print_link_status()
>       bnxt_en: Report PCIe link properties with pcie_print_link_status()
>       cxgb4: Report PCIe link properties with pcie_print_link_status()
>       fm10k: Report PCIe link properties with pcie_print_link_status()
>       ixgbe: Report PCIe link properties with pcie_print_link_status()
>       PCI: Remove unused pcie_get_minimum_link()

I remember seeing some of these in my tree.

> Tal Gilboa (8):
>       PCI: Add pcie_get_speed_cap() to find max supported link speed
>       PCI: Add pcie_get_width_cap() to find max supported link width
>       PCI: Add pcie_bandwidth_capable() to compute max supported link bandwidth
>       PCI: Add pcie_bandwidth_available() to compute bandwidth available to device

I definitely have these.

>       PCI: Add pcie_print_link_status() to log link speed and whether it's limited

This one, I have, but it's not what I need. This looks at the available
bandwidth from root port to endpoint, whereas I'm only interested in
downtraining between endpoint and upstream port.

Alex