linux-kernel - Re: [PATCH] PCI: pciehp: Report degraded links via link bandwidth notification

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Message-ID: <10579c9bf79a42dd878c1e201bc9d254@ausx13mps321.AMER.DELL.COM>
Date:   Thu, 29 Nov 2018 23:24:58 +0000
From:   <Alex_Gagniuc@...lteam.com>
To:     <helgaas@...nel.org>, <lukas@...ner.de>
Cc:     <mr.nuke.me@...il.com>, <Austin.Bolen@...l.com>,
        <keith.busch@...el.com>, <Shyam.Iyer@...l.com>,
        <mika.westerberg@...ux.intel.com>, <okaya@...eaurora.org>,
        <rafael.j.wysocki@...el.com>, <poza@...eaurora.org>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: pciehp: Report degraded links via link bandwidth
 notification

On 11/29/2018 5:05 PM, Bjorn Helgaas wrote:
> On Thu, Nov 29, 2018 at 08:13:12PM +0100, Lukas Wunner wrote:
>> I guess the interrupt is shared with hotplug and PME?  In that case write
>> a separate pcie_port_service_driver and request the interrupt with
>> IRQF_SHARED.  Define a new service type in drivers/pci/pcie/portdrv.h.
>> Amend get_port_device_capability() to check for PCI_EXP_LNKCAP_LBNC.
> 
> I really don't like the port driver design.  I'd rather integrate
> those services more tightly into the PCI core.  But realistically
> that's wishful thinking and may never happen, so this might be the
> most expedient approach.

So, how would it get integrated? I don't like the port service driver 
either. It's too dicky on how it creates some new devices that other 
drives bind to. If we could have a 1:1 mapping between service drivers 
and PCI capabilities, then it might make better sense.

So, do I go the new service driver route?

Alex