linux-kernel - [PATCH AUTOSEL 4.18 88/88] PCI/AER: Honor "pcie_ports=native" even if HEST sets FIRMWARE

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Message-ID: <20180907003547.57567-88-alexander.levin@microsoft.com>
Date:   Fri, 7 Sep 2018 00:36:54 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.18 88/88] PCI/AER: Honor "pcie_ports=native" even if
 HEST sets FIRMWARE_FIRST

From: Alexandru Gagniuc <mr.nuke.me@...il.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@...il.com>
[bhelgaas: return "false" from bool function (from kbuild robot)]
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/pci/pcie/aer.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a2e88386af28..0fbf612b8ef2 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -303,6 +303,9 @@ int pcie_aer_get_firmware_first(struct pci_dev *dev)
 	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;
-- 
2.17.1