linux-kernel - [PATCH v4] PCI/AER: Fix aerdrv loading with "pcie

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Date:   Tue,  3 Jul 2018 18:27:43 -0500
From:   Alexandru Gagniuc <mr.nuke.me@...il.com>
To:     bhelgaas@...gle.com, keith.busch@...el.com
Cc:     alex_gagniuc@...lteam.com, austin_bolen@...l.com,
        shyam_iyer@...l.com, Alexandru Gagniuc <mr.nuke.me@...il.com>,
        Frederick Lawler <fred@...dlawl.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Oza Pawandeep <poza@...eaurora.org>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4] PCI/AER: Fix aerdrv loading with "pcie_ports=native" parameter

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.

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>
---
 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..63a66a3b2fb5 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 0;
+
 	if (!parsed) {
 		apei_hest_parse(aer_hest_parse, &info);
 		aer_firmware_first = info.firmware_first;
-- 
2.14.3