linux-kernel - [PATCH v3 1/2] PCI/AER: Use _OSC to determine Firmware First before HEST

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Message-Id: <1588272369-2145-2-git-send-email-jonathan.derrick@intel.com>
Date:   Thu, 30 Apr 2020 12:46:08 -0600
From:   Jon Derrick <jonathan.derrick@...el.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     <linux-pci@...r.kernel.org>,
        Jon Derrick <jonathan.derrick@...el.com>,
        Russell Currey <ruscur@...sell.cc>,
        Sam Bobroff <sbobroff@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Frederick Lawler <fred@...dlawl.com>,
        Rajat Jain <rajatja@...gle.com>,
        "Patel, Mayurkumar" <mayurkumar.patel@...el.com>,
        Olof Johansson <olof@...om.net>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/2] PCI/AER: Use _OSC to determine Firmware First before HEST

After a5bf8719af: "PCI/AER: Use only _OSC to determine AER ownership",
_OSC is the primary determiner of ownership of Firmware First error
handling rather than HEST.

ACPI Root Bus enumeration has been modified to flag Host Bridge devices
as using Native AER when _OSC has been negotiated for AER services.

This patch ensures the PCI layers first uses the _OSC negotiated state
by checking the Host Bridge's Native AER flag prior to HEST parsing.

Signed-off-by: Jon Derrick <jonathan.derrick@...el.com>
---
 drivers/pci/pcie/aer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index efc2677..f3d02f4 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -314,6 +314,9 @@ int pcie_aer_get_firmware_first(struct pci_dev *dev)
 	if (pcie_ports_native)
 		return 0;
 
+	if (pci_find_host_bridge(dev->bus)->native_aer)
+		return 0;
+
 	if (!dev->__aer_firmware_first_valid)
 		aer_set_firmware_first(dev);
 	return dev->__aer_firmware_first;
-- 
1.8.3.1