Hi Sathyanarayanan, On Wed, 2020-04-22 at 15:48 -0700, Kuppuswamy, Sathyanarayanan wrote: > > On 4/20/20 2:37 PM, Jon Derrick wrote: > > Some platforms have a mix of ports whose capabilities can be negotiated > > by _OSC, and some ports which are not described by ACPI and instead > > managed by Native drivers. The existing Firmware-First HEST model can > > incorrectly tag these Native, Non-ACPI ports as Firmware-First managed > > ports by advertising the HEST Global Flag and matching the type and > > class of the port (aer_hest_parse). > Is there a real use case for mixed mode (one host bridge in FF mode and > another in native)? Intel's VMD exposes PCIe segments containing Root Ports and Bridges and other DPC consumers. These extra PCIe domains aren't described by ACPI. There have been a few versions where DPC won't bind due to platform's HEST configuration. > > If the port requests Native AER through the Host Bridge's capability > > settings, the AER driver should honor those settings and allow the port > > to bind. This patch changes the definition of Firmware-First to exclude > > ports whose Host Bridges request Native AER. > > > > Signed-off-by: Jon Derrick <jonathan.derrick@xxxxxxxxx> > > --- > > drivers/pci/pcie/aer.c | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c > > index f4274d3..30fbd1f 100644 > > --- a/drivers/pci/pcie/aer.c > > +++ b/drivers/pci/pcie/aer.c > > @@ -314,6 +314,9 @@ int pcie_aer_get_firmware_first(struct pci_dev *dev) > > if (pcie_ports_native) > > return 0; > > > > + if (pci_find_host_bridge(dev->bus)->native_aer) > > + return 0; > > + > > if (!dev->__aer_firmware_first_valid) > > aer_set_firmware_first(dev); > > return dev->__aer_firmware_first; > >
