Hello Any feedback on this? Thanks Gab > -----Original Message----- > From: linux-pci-owner@xxxxxxxxxxxxxxx [mailto:linux-pci- > owner@xxxxxxxxxxxxxxx] On Behalf Of Gabriele Paoloni > Sent: 18 May 2017 11:02 > To: Keith Busch > Cc: linux-pci@xxxxxxxxxxxxxxx; Linuxarm; liudongdong (C) > Subject: [Question] eDPC and DPC settings in BIOS or Kernel? > > Hi Keith and all > > We are currently working on extending the current DPC driver > In Linux with eDPC features. > > While working on it we are wondering on whether "RP PIO Mask Register" > and "RP PIO Severity Register" should be set in BIOS or Kernel. > > If we look at the current DPC driver we see that DPC is enabled in > kernel and "DPC Trigger Enable" is set to 10b where instead the PCIe > specs says that "DPC is disabled by default". > > Consistently for "RP PIO Severity Register" and "RP PIO Mask Register" > we see that their bits defaults to 0b and 1b respectively (i.e. by > defaults all RP PIO events are masked and treated as Advisory Non- > Fatal). > > So we have some questions: > 1) Why the current "DPC Trigger Enable" is enabled in Kernel rather > than > BIOS? (enabling it in BIOS seems more scalable to fit different > systems' > scenarios) > > 2) Do you have any advice on where to enable and unmask RP PIO events? > > Many thanks > Gab
