linux-kernel - [PATCH] PCI/DPC: Quirk PIO log size for Intel Raptor Lake Root Ports

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Message-ID: <20240305113057.56468-1-pmenzel@molgen.mpg.de>
Date: Tue,  5 Mar 2024 12:30:56 +0100
From: Paul Menzel <pmenzel@...gen.mpg.de>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Paul Menzel <pmenzel@...gen.mpg.de>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	nvaert1986@...mail.com,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] PCI/DPC: Quirk PIO log size for Intel Raptor Lake Root Ports

Commit 5459c0b70467 ("PCI/DPC: Quirk PIO log size for certain Intel Root
Ports") and commit 3b8803494a06 ("PCI/DPC: Quirk PIO log size for Intel Ice
Lake Root Ports") add quirks for Ice, Tiger and Alder Lake Root Ports.
System firmware for Raptor Lake still has the bug, so Linux logs the
warning below on several Raptor Lake systems like Dell Precision 3581 with
Intel Raptor Lake processor (0W18NX) system firmware/BIOS version 1.10.1.

    pci 0000:00:07.0: [8086:a76e] type 01 class 0x060400
    pci 0000:00:07.0: PME# supported from D0 D3hot D3cold
    pci 0000:00:07.0: PTM enabled (root), 4ns granularity
    pci 0000:00:07.0: DPC: RP PIO log size 0 is invalid
    pci 0000:00:07.1: [8086:a73f] type 01 class 0x060400
    pci 0000:00:07.1: PME# supported from D0 D3hot D3cold
    pci 0000:00:07.1: PTM enabled (root), 4ns granularity
    pci 0000:00:07.1: DPC: RP PIO log size 0 is invalid

So, apply the quirk for Raptor Lake Root Ports as well.

This also enables the DPC driver to dump the RP PIO Log registers when DPC
is triggered.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218560
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: nvaert1986@...mail.com
Signed-off-by: Paul Menzel <pmenzel@...gen.mpg.de>
---
 drivers/pci/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index d797df6e5f3e..663d838fa861 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -6225,6 +6225,8 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2b, dpc_log_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2d, dpc_log_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a2f, dpc_log_size);
 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0xa73f, dpc_log_size);
+DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0xa76e, dpc_log_size);
 #endif
 
 /*
-- 
2.43.0