linux-kernel - Re: [PATCH v11 4/5] PCI/portdrv: Remove redundant pci_aer

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Date:   Wed, 28 Oct 2020 10:13:48 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Ethan Zhao <xerces.zhao@...il.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ashok Raj <ashok.raj@...el.com>, knsathya@...nel.org
Subject: Re: [PATCH v11 4/5] PCI/portdrv: Remove redundant pci_aer_available()
 check in DPC enable logic



On 10/27/20 11:00 PM, Ethan Zhao wrote:
> On Tue, Oct 27, 2020 at 10:00 PM Kuppuswamy Sathyanarayanan
> <sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>>
>> In DPC service enable logic, check for
>> services & PCIE_PORT_SERVICE_AER implies pci_aer_available()
> How about PCIE_PORT_SERVICE_AER is not configured, but
> pcie_aer_disable == 0 ？
Its not possible in current code flow. DPC service is configured
following AER service configuration.
>> is true. So there is no need to explicitly check it again.
>>
>> Also, passing pcie_ports=dpc-native in kernel command line
>> implies DPC needs to be enabled in native mode irrespective
>> of AER ownership status. So checking for pci_aer_available()
>> without checking for pcie_ports status is incorrect.
>>
>> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>> ---
>>   drivers/pci/pcie/portdrv_core.c | 1 -
>>   1 file changed, 1 deletion(-)
>>
>> diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
>> index 2c0278f0fdcc..e257a2ca3595 100644
>> --- a/drivers/pci/pcie/portdrv_core.c
>> +++ b/drivers/pci/pcie/portdrv_core.c
>> @@ -252,7 +252,6 @@ static int get_port_device_capability(struct pci_dev *dev)
>>           * permission to use AER.
>>           */
>>          if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
>> -           pci_aer_available() &&
>>              (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
>>                  services |= PCIE_PORT_SERVICE_DPC;
>>
>> --
>> 2.17.1
>>

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer