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Subject[PATCH 4.18 097/235] PCI/AER: Honor "pcie_ports=native" even if HEST sets FIRMWARE_FIRST
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexandru Gagniuc <mr.nuke.me@gmail.com>

[ Upstream commit 7af02fcd84c16801958936f88b848944c726ca07 ]

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
list PCIe ports as firmware-first, linux will not use native services.

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@gmail.com>
[bhelgaas: return "false" from bool function (from kbuild robot)]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/pci/pcie/aer.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -303,6 +303,9 @@ int pcie_aer_get_firmware_first(struct p
if (!pci_is_pcie(dev))
return 0;

+ if (pcie_ports_native)
+ return 0;
+
if (!dev->__aer_firmware_first_valid)
aer_set_firmware_first(dev);
return dev->__aer_firmware_first;
@@ -323,6 +326,9 @@ bool aer_acpi_firmware_first(void)
.firmware_first = 0,
};

+ if (pcie_ports_native)
+ return false;
+
if (!parsed) {
apei_hest_parse(aer_hest_parse, &info);
aer_firmware_first = info.firmware_first;

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