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

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Date:   Thu,  7 Jun 2018 14:33:40 -0500
From:   Alexandru Gagniuc <mr.nuke.me@...il.com>
To:     linux-acpi@...r.kernel.org
Cc:     alex_gagniuc@...lteam.com, austin_bolen@...l.com,
        shyam_iyer@...l.com, keith.busch@...el.com,
        Alexandru Gagniuc <mr.nuke.me@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] 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/aerdrv_acpi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer/aerdrv_acpi.c b/drivers/pci/pcie/aer/aerdrv_acpi.c
index 08c87de13cb8..4b491851a781 100644
--- a/drivers/pci/pcie/aer/aerdrv_acpi.c
+++ b/drivers/pci/pcie/aer/aerdrv_acpi.c
@@ -101,7 +101,7 @@ 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;
@@ -135,6 +135,8 @@ 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