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From: Ethan Zhao <xerces.zhao@gmail.com>
To: "Kuppuswamy,
	Sathyanarayanan"  <sathyanarayanan.kuppuswamy@linux.intel.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: Mon, 2 Nov 2020 17:59:57 +0800
Message-ID: <CAKF3qh3ozCp7EsOA0X7kaKH2MGLHZWTAu0ZNTwhQiY6UD=M3Hg@mail.gmail.com> (raw)
In-Reply-To: <ee679e38-dd8a-7d43-8715-a4e454664f89@linux.intel.com>

The current logic is
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
    pci_aer_available() &&
    (pcie_ports_dpc_native || (services & PCIE_PORT_SERVICE_AER)))
services |= PCIE_PORT_SERVICE_DPC;


if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
    pci_aer_available() &&
    (pcie_ports_dpc_native))
 services |= PCIE_PORT_SERVICE_DPC;

or

if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
    pci_aer_available() &&(services & PCIE_PORT_SERVICE_AER))
  services |= PCIE_PORT_SERVICE_DPC;

do you mean one of the possible is
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
    (pcie_ports_dpc_native))
 services |= PCIE_PORT_SERVICE_DPC;

after your patch ? nothing about AER ?

Thanks,
Ethan

On Thu, Oct 29, 2020 at 1:14 AM Kuppuswamy, Sathyanarayanan
<sathyanarayanan.kuppuswamy@linux.intel.com> wrote:
>
>
>
> 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
2020-11-02  9:59       ` Ethan Zhao [this message]
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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