linux-kernel - [PATCH v5 6/7] PCI: Enable NO_BUS

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Message-Id: <20210529192527.2708-7-ameynarkhede03@gmail.com>
Date:   Sun, 30 May 2021 00:55:26 +0530
From:   Amey Narkhede <ameynarkhede03@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     alex.williamson@...hat.com,
        Raphael Norwitz <raphael.norwitz@...anix.com>,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        kw@...ux.com, Shanker Donthineni <sdonthineni@...dia.com>,
        Sinan Kaya <okaya@...nel.org>
Subject: [PATCH v5 6/7] PCI: Enable NO_BUS_RESET quirk for Nvidia GPUs

From: Shanker Donthineni <sdonthineni@...dia.com>

On select platforms, some Nvidia GPU devices do not work with SBR.
Triggering SBR would leave the device inoperable for the current
system boot. It requires a system hard-reboot to get the GPU device
back to normal operating condition post-SBR. For the affected
devices, enable NO_BUS_RESET quirk to fix the issue.

This issue will be fixed in the next generation of hardware.

Signed-off-by: Shanker Donthineni <sdonthineni@...dia.com>
Reviewed-by: Sinan Kaya <okaya@...nel.org>
---
 drivers/pci/quirks.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index e86cf4a3b..45a8c3caa 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3546,6 +3546,18 @@ static void quirk_no_bus_reset(struct pci_dev *dev)
 	dev->dev_flags |= PCI_DEV_FLAGS_NO_BUS_RESET;
 }
 
+/*
+ * Some Nvidia GPU devices do not work with bus reset, SBR needs to be
+ * prevented for those affected devices.
+ */
+static void quirk_nvidia_no_bus_reset(struct pci_dev *dev)
+{
+	if ((dev->device & 0xffc0) == 0x2340)
+		quirk_no_bus_reset(dev);
+}
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID,
+			 quirk_nvidia_no_bus_reset);
+
 /*
  * Some Atheros AR9xxx and QCA988x chips do not behave after a bus reset.
  * The device will throw a Link Down error on AER-capable systems and
-- 
2.31.1