[+cc Borislav, linux-acpi, since this involves APEI/HEST] On Tue, Jun 19, 2018 at 02:58:20PM -0500, Alexandru Gagniuc wrote: > According to the documentation, "pcie_ports=native", linux should use > native AER and DPC services. While that is true for the _OSC method > parsing, this is not the only place that is checked. Should the HEST > table list PCIe ports as firmware-first, linux will not use native > services. Nothing in ACPI-land looks at pcie_ports_native. How should ACPI things work in the "pcie_ports=native" case? I guess we still have to expect to receive error records from the firmware, because it may certainly send us non-PCI errors (machine checks, etc) and maybe even some PCI errors (even if the Linux AER driver claims AER interrupts, we don't know what notification mechanisms the firmware may be using). I guess best-case, we'll get ACPI error records for all non-PCI things, and the Linux AER driver will see all the AER errors. Worst-case, I don't really know what to expect. Duplicate reporting of AER errors via firmware and Linux AER driver? Some kind of confusion about who acknowledges and clears them? Out of curiosity, what is your use case for "pcie_ports=native"? Presumably there's something that works better when using it, and things work even *better* with this patch? I know people do use it, because I often see it mentioned in forums and bug reports, but I really don't expect it to work very well because we're ignoring the usage model the firmware is designed around. My unproven suspicion is that most uses are in the black magic category of "there's a bug here, and we don't know how to fix it, but pcie_ports=native makes it work better". Obviously I would much rather find and fix those bugs so people wouldn't have to stumble over the problem in the first place. > This happens because aer_acpi_firmware_first() doesn't take > 'pcie_ports' into account. This is wrong. DPC uses the same logic when > it decides whether to load or not, so fixing this also fixes DPC not > loading. > > Signed-off-by: Alexandru Gagniuc <mr.nuke.me@xxxxxxxxx> > --- > drivers/pci/pcie/aer.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > Changes since v1: > - Re-tested with latest and greatest (v4.18-rc1) -- works great > > diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c > index a2e88386af28..98ced0f7c850 100644 > --- a/drivers/pci/pcie/aer.c > +++ b/drivers/pci/pcie/aer.c > @@ -291,7 +291,7 @@ static void aer_set_firmware_first(struct pci_dev *pci_dev) > > rc = apei_hest_parse(aer_hest_parse, &info); > > - if (rc) > + if (rc || pcie_ports_native) > pci_dev->__aer_firmware_first = 0; > else > pci_dev->__aer_firmware_first = info.firmware_first; > @@ -327,6 +327,9 @@ bool aer_acpi_firmware_first(void) > apei_hest_parse(aer_hest_parse, &info); > aer_firmware_first = info.firmware_first; > parsed = true; > + if (pcie_ports_native) > + aer_firmware_first = 0; > + > } > return aer_firmware_first; > } > -- > 2.14.3 > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
