linux-kernel - [PATCH 5.15 17/20] PCI: Add MSI masking quirk for Nvidia ION AHCI

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Date:   Fri, 19 Nov 2021 18:39:35 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rui Salvaterra <rsalvaterra@...il.com>,
        Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <helgaas@...nel.org>
Subject: [PATCH 5.15 17/20] PCI: Add MSI masking quirk for Nvidia ION AHCI

From: Marc Zyngier <maz@...nel.org>

commit f21082fb20dbfb3e42b769b59ef21c2a7f2c7c1f upstream.

The ION AHCI device pretends that MSI masking isn't a thing, while it
actually implements it and needs MSIs to be unmasked to work. Add a quirk
to that effect.

Reported-by: Rui Salvaterra <rsalvaterra@...il.com>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: Rui Salvaterra <rsalvaterra@...il.com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Bjorn Helgaas <helgaas@...nel.org>
Link: https://lore.kernel.org/r/CALjTZvbzYfBuLB+H=fj2J+9=DxjQ2Uqcy0if_PvmJ-nU-qEgkg@mail.gmail.com
Link: https://lore.kernel.org/r/20211104180130.3825416-3-maz@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/pci/quirks.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5796,3 +5796,9 @@ static void apex_pci_fixup_class(struct
 }
 DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
 			       PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
+
+static void nvidia_ion_ahci_fixup(struct pci_dev *pdev)
+{
+	pdev->dev_flags |= PCI_DEV_FLAGS_HAS_MSI_MASKING;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0ab8, nvidia_ion_ahci_fixup);