linux-kernel - [PATCH 4/8] PCI: Add quirk to disable MSI support for Amazon's Annapurna Labs host bridge

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Message-ID: <20190710164519.17883-5-jonnyc@amazon.com>
Date:   Thu, 11 Jul 2019 17:56:25 +0300
From:   Jonathan Chocron <jonnyc@...zon.com>
To:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <jingoohan1@...il.com>, <gustavo.pimentel@...opsys.com>,
        <robh+dt@...nel.org>, <mark.rutland@....com>
CC:     <dwmw@...zon.co.uk>, <benh@...nel.crashing.org>,
        <alisaidi@...zon.com>, <ronenk@...zon.com>, <barakw@...zon.com>,
        <talel@...zon.com>, <hanochu@...zon.com>, <hhhawa@...zon.com>,
        <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <jonnyc@...zon.com>
Subject: [PATCH 4/8] PCI: Add quirk to disable MSI support for Amazon's
 Annapurna Labs host bridge

On some platforms, the host bridge exposes an MSI-X capability but
doesn't actually support it.
This causes a crash during initialization by the pcieport driver, since
it tries to configure the MSI-X capability.

Signed-off-by: Jonathan Chocron <jonnyc@...zon.com>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 11850b030637..0fb70d755977 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2925,6 +2925,14 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0x10a1,
 			quirk_msi_intx_disable_qca_bug);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, 0xe091,
 			quirk_msi_intx_disable_qca_bug);
+
+static void quirk_al_msi_disable(struct pci_dev *dev)
+{
+	dev->no_msi = 1;
+	dev_warn(&dev->dev, "Annapurna Labs pcie quirk - disabling MSI\n");
+}
+DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
+			      PCI_CLASS_BRIDGE_PCI, 8, quirk_al_msi_disable);
 #endif /* CONFIG_PCI_MSI */
 
 /*
-- 
2.17.1