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From: "Kuppuswamy, Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Ethan Zhao <xerces.zhao@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
	linux-pci <linux-pci@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Ashok Raj <ashok.raj@intel.com>,
	knsathya@kernel.org
Subject: Re: [PATCH v11 4/5] PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable logic
Date: Wed, 28 Oct 2020 10:13:48 -0700
Message-ID: <ee679e38-dd8a-7d43-8715-a4e454664f89@linux.intel.com> (raw)
In-Reply-To: <CAKF3qh1J=_nxFTztyEjMBJav_W+JY60gzf27dvantMeKU+Aatg@mail.gmail.com>



On 10/27/20 11:00 PM, Ethan Zhao wrote:
> On Tue, Oct 27, 2020 at 10:00 PM Kuppuswamy Sathyanarayanan
> <sathyanarayanan.kuppuswamy@linux.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@linux.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

  reply index

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-27  2:57 [PATCH v11 0/5] Simplify PCIe native ownership detection logic Kuppuswamy Sathyanarayanan
2020-10-27  2:57 ` [PATCH v11 1/5] PCI: Conditionally initialize host bridge native_* members Kuppuswamy Sathyanarayanan
2020-10-28  6:09   ` Ethan Zhao
2020-10-28 17:14     ` Kuppuswamy, Sathyanarayanan
2020-10-27  2:57 ` [PATCH v11 2/5] ACPI/PCI: Ignore _OSC negotiation result if pcie_ports_native is set Kuppuswamy Sathyanarayanan
2020-11-25 20:12   ` Bjorn Helgaas
2020-11-25 22:21     ` Kuppuswamy, Sathyanarayanan
2020-11-25 22:25       ` Bjorn Helgaas
2020-11-25 22:38         ` Kuppuswamy, Sathyanarayanan
2020-11-25 20:28   ` Bjorn Helgaas
2020-11-26  0:58     ` Kuppuswamy, Sathyanarayanan
2020-10-27  2:57 ` [PATCH v11 3/5] ACPI/PCI: Ignore _OSC DPC negotiation result if pcie_ports_dpc_native " Kuppuswamy Sathyanarayanan
2020-11-25 20:50   ` Bjorn Helgaas
2020-10-27  2:57 ` [PATCH v11 4/5] PCI/portdrv: Remove redundant pci_aer_available() check in DPC enable logic Kuppuswamy Sathyanarayanan
2020-10-28  6:00   ` Ethan Zhao
2020-10-28 17:13     ` Kuppuswamy, Sathyanarayanan [this message]
2020-11-02  9:59       ` Ethan Zhao
2020-10-27  2:57 ` [PATCH v11 5/5] PCI/DPC: Move AER/DPC dependency checks out of DPC driver Kuppuswamy Sathyanarayanan
2020-11-13 21:59 ` [PATCH v11 0/5] Simplify PCIe native ownership detection logic Kuppuswamy, Sathyanarayanan

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