linux-kernel - Re: [PATCH v2] PCI: disable SERR for kdump kernel

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Message-ID: <a1b0cc72-1724-9b67-ec58-9650d2e8ff94@codeaurora.org>
Date:   Thu, 20 Apr 2017 20:04:03 -0400
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Yinghai Lu <yinghai@...nel.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] PCI: disable SERR for kdump kernel

On 4/20/2017 7:37 PM, Yinghai Lu wrote:
> On Thu, Apr 20, 2017 at 10:14 AM, Sinan Kaya <okaya@...eaurora.org> wrote:
>> On 4/18/2017 8:31 PM, Yinghai Lu wrote:
>>> * pci_setup_device - fill in class and map information of a device
>>>   * @dev: the device structure to fill
>>> @@ -1572,6 +1592,9 @@ int pci_setup_device(struct pci_dev *dev
>>>       /* device class may be changed after fixup */
>>>       class = dev->class >> 8;
>>>
>>> +     if (is_kdump_kernel())
>>> +             pci_disable_serr(dev);
>>> +
>>
>> This sounds like something that needs to be done while shutting down
>> the first kernel as part of the kdump procedure rather than boot of
>> the kdump kernel in pci setup.
> 
> For kdump path, first kernel shutdown path is not called.
> 
> We have to do sth in second kernel instead.
> 

I didn't know that. Bjorn's compatibility point is also a concern. 
Ideally you want something in both places.

> Thanks
> 
> Yinghai
> 


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.