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PCI/DPC: Do not enable DPC if AER control is not allowed by the BIOS

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Commit eed85ff4c0 ("PCI/DPC: Enable DPC only if AER is available") made
DPC control dependent whether AER is enabled in the OS.  However, it does
not take into account situations where BIOS has not given OS control of
AER:

  acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
  acpi PNP0A08:00: _OSC: platform does not support [AER]
  acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME PCIeCapability]

I think here it is better not to enable DPC even if the capability is
available because then it would be against what "Determination of DPC
Control" note in PCIe 4.0 sec 6.1.10 recommends.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
This commit is contained in:
Mika Westerberg 2018-03-27 13:48:35 +03:00 committed by Bjorn Helgaas
parent f0553ba08a
commit 4e5fad429b
2 changed files with 3 additions and 3 deletions
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4
drivers/pci/pcie/portdrv_acpi.c
View file

@ -47,11 +47,11 @@ void pcie_port_acpi_setup(struct pci_dev *port, int *srv_mask)
flags = root->osc_control_set;
*srv_mask = PCIE_PORT_SERVICE_DPC;
*srv_mask = 0;
if (flags & OSC_PCI_EXPRESS_NATIVE_HP_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_HP;
if (flags & OSC_PCI_EXPRESS_PME_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_PME;
if (flags & OSC_PCI_EXPRESS_AER_CONTROL)
*srv_mask |= PCIE_PORT_SERVICE_AER;
*srv_mask |= PCIE_PORT_SERVICE_AER | PCIE_PORT_SERVICE_DPC;
}

2
drivers/pci/pcie/portdrv_core.c
View file

@ -242,7 +242,7 @@ static int get_port_device_capability(struct pci_dev *dev)
}
if (pci_find_ext_capability(dev, PCI_EXT_CAP_ID_DPC) &&
pci_aer_available())
pci_aer_available() && services & PCIE_PORT_SERVICE_AER)
services |= PCIE_PORT_SERVICE_DPC;
return services;