linux-kernel - Re: [PATCH v6 07/10] PCI/RCEC: Add RCiEP's linked RCEC to AER/ERR

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Date:   Mon, 28 Sep 2020 14:36:00 -0700
From:   "Sean V Kelley" <sean.v.kelley@...el.com>
To:     "Bjorn Helgaas" <helgaas@...nel.org>
Cc:     "Sean V Kelley" <seanvk.dev@...gontracks.org>, bhelgaas@...gle.com,
        Jonathan.Cameron@...wei.com, rafael.j.wysocki@...el.com,
        ashok.raj@...el.com, tony.luck@...el.com,
        sathyanarayanan.kuppuswamy@...el.com, qiuxu.zhuo@...el.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 07/10] PCI/RCEC: Add RCiEP's linked RCEC to AER/ERR

On 27 Sep 2020, at 18:47, Bjorn Helgaas wrote:

> On Sun, Sep 27, 2020 at 06:45:45PM -0500, Bjorn Helgaas wrote:
>> On Tue, Sep 22, 2020 at 02:38:56PM -0700, Sean V Kelley wrote:
>>> From: Qiuxu Zhuo <qiuxu.zhuo@...el.com>
>
>>>  	pci_dbg(dev, "broadcast error_detected message\n");
>>>  	if (state == pci_channel_io_frozen) {
>>> -		pci_bridge_walk(bridge, report_frozen_detected, &status);
>>> +		pci_bridge_walk(bridge, dev, report_frozen_detected, &status);
>>>  		if (type == PCI_EXP_TYPE_RC_END) {
>>> +			/*
>>> +			 * The callback only clears the Root Error Status
>>> +			 * of the RCEC (see aer.c).
>>> +			 */
>>> +			if (bridge)
>>> +				reset_subordinate_devices(bridge);
>>
>> It's unfortunate to add yet another special case in this code, and 
>> I'm
>> not thrilled about the one in aer_root_reset() either.  It's just not
>> obvious why they should be there.  I'm sure if I spent 30 minutes
>> decoding things, it would all make sense.  Guess I'm just griping
>> because I don't have a better suggestion.
>
> I'm sorry, this was unkind of me.  If I don't have a constructive
> idea, there's no reason for me to complain about this.  I apologize.
>
> Bjorn

No worries at all. The unfortunate handling of the Spec for RCEC/RCiEP 
associations and the added needs for native versus non-native is 
frustrating.

Sean