From: "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: ashok.raj@intel.com, knsathya@kernel.org,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Bjorn Helgaas <bhelgaas@google.com>,
Olof Johansson <olof@lixom.net>
Subject: Re: [PATCH 1/5] PCI/DPC: Ignore devices with no AER Capability
Date: Wed, 25 Nov 2020 18:01:57 -0800 [thread overview]
Message-ID: <45dc5ef5-bfb4-6c0b-88c7-55a904f82965@linux.intel.com> (raw)
In-Reply-To: <20201126011816.711106-2-helgaas@kernel.org>
On 11/25/20 5:18 PM, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> Downstream Ports may support DPC regardless of whether they support AER
> (see PCIe r5.0, sec 6.2.10.2). Previously, if the user booted with
> "pcie_ports=dpc-native", it was possible for dpc_probe() to succeed even if
> the device had no AER Capability, but dpc_get_aer_uncorrect_severity()
> depends on the AER Capability.
>
> dpc_probe() previously failed if:
>
> !pcie_aer_is_native(pdev) && !pcie_ports_dpc_native
> !(pcie_aer_is_native() || pcie_ports_dpc_native) # by De Morgan's law
>
> so it succeeded if:
>
> pcie_aer_is_native() || pcie_ports_dpc_native
>
> Fail dpc_probe() if the device has no AER Capability.
>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Olof Johansson <olof@lixom.net>
> ---
> drivers/pci/pcie/dpc.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c
> index e05aba86a317..ed0dbc43d018 100644
> --- a/drivers/pci/pcie/dpc.c
> +++ b/drivers/pci/pcie/dpc.c
> @@ -287,6 +287,9 @@ static int dpc_probe(struct pcie_device *dev)
> int status;
> u16 ctl, cap;
>
> + if (!pdev->aer_cap)
> + return -ENOTSUPP;
Don't we check aer_cap support in drivers/pci/pcie/portdrv_core.c ?
We don't enable DPC service, if AER service is not enabled. And AER
service is only enabled if AER capability is supported.
So dpc_probe() should not happen if AER capability is not supported?
206 static int get_port_device_capability(struct pci_dev *dev)
...
...
251 if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
252 host->native_dpc &&
253 (host->native_dpc || (services & PCIE_PORT_SERVICE_AER)))
254 services |= PCIE_PORT_SERVICE_DPC;
255
> +
> if (!pcie_aer_is_native(pdev) && !pcie_ports_dpc_native)
> return -ENOTSUPP;
>
>
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
next prev parent reply other threads:[~2020-11-26 2:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-26 1:18 [PATCH v12 0/5] Simplify PCIe native ownership Bjorn Helgaas
2020-11-26 1:18 ` [PATCH 1/5] PCI/DPC: Ignore devices with no AER Capability Bjorn Helgaas
2020-11-26 2:01 ` Kuppuswamy, Sathyanarayanan [this message]
2020-11-28 20:24 ` Bjorn Helgaas
2020-11-28 21:49 ` Kuppuswamy, Sathyanarayanan
2020-11-28 21:53 ` Bjorn Helgaas
2020-11-28 21:56 ` Kuppuswamy, Sathyanarayanan
2020-11-28 23:25 ` Bjorn Helgaas
2020-11-29 4:32 ` Kuppuswamy, Sathyanarayanan
2020-12-01 15:34 ` Bjorn Helgaas
2020-11-26 1:18 ` [PATCH 2/5] PCI: Assume control of portdrv-related features only when portdrv enabled Bjorn Helgaas
2020-11-26 1:18 ` [PATCH 3/5] PCI/ACPI: Tidy _OSC control bit checking Bjorn Helgaas
2020-11-26 1:18 ` [PATCH 4/5] PCI/ACPI: Centralize pcie_ports_native checking Bjorn Helgaas
2020-11-26 3:20 ` Kuppuswamy, Sathyanarayanan
2020-11-28 21:45 ` Bjorn Helgaas
2020-11-26 1:18 ` [PATCH 5/5] PCI/ACPI: Centralize pci_aer_available() checking Bjorn Helgaas
2020-11-26 3:48 ` [PATCH v12 0/5] Simplify PCIe native ownership Kuppuswamy, Sathyanarayanan
2020-12-01 1:11 ` Kuppuswamy, Sathyanarayanan
2020-12-08 6:03 ` Kuppuswamy, Sathyanarayanan
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