linux-kernel - [PATCH v6 1/1] PCI: Avoid putting some root ports into D3 on some Ryzen chips

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Sat, 8 Jul 2023 16:44:57 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Bjorn Helgaas <helgaas@...nel.org>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
        Mario Limonciello <mario.limonciello@....com>,
        <stable@...r.kernel.org>, Iain Lane <iain@...ngesquash.org.uk>
Subject: [PATCH v6 1/1] PCI: Avoid putting some root ports into D3 on some Ryzen chips

commit 9d26d3a8f1b0 ("PCI: Put PCIe ports into D3 during suspend")
sets the policy that all PCIe ports are allowed to use D3.  When
the system is suspended if the port is not power manageable by the
platform and won't be used for wakeup via a PME this sets up the
policy for these ports to go into D3hot.

This policy generally makes sense from an OSPM perspective but it leads
to problems with wakeup from suspend on laptops with AMD chips:

- On family 19h model 44h (PCI 0x14b9) this manifests as a missing wakeup
  interrupt.
- On family 19h model 74h (PCI 0x14eb) this manifests as a system hang.

Add a quirk for the PCI device ID used by the problematic root port on
both chips to ensure that these root ports are not put into D3hot at
suspend.

Cc: stable@...r.kernel.org # 6.1+
Reported-by: Iain Lane <iain@...ngesquash.org.uk>
Closes: https://forums.lenovo.com/t5/Ubuntu/Z13-can-t-resume-from-suspend-with-external-USB-keyboard/m-p/5217121
Fixes: 9d26d3a8f1b0 ("PCI: Put PCIe ports into D3 during suspend")
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
 drivers/pci/quirks.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 321156ca273d5..e0346073e5855 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3867,6 +3867,22 @@ static void quirk_apple_poweroff_thunderbolt(struct pci_dev *dev)
 DECLARE_PCI_FIXUP_SUSPEND_LATE(PCI_VENDOR_ID_INTEL,
 			       PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C,
 			       quirk_apple_poweroff_thunderbolt);
+
+/*
+ * Putting PCIe root ports on Ryzen SoCs with USB4 controllers into D3hot
+ * may cause problems when the system attempts wake up from s2idle.
+ *
+ * On family 19h model 44h (PCI 0x14b9) this manifests as a missing wakeup
+ * interrupt.
+ * On family 19h model 74h (PCI 0x14eb) this manifests as a system hang.
+ */
+static void quirk_ryzen_rp_d3(struct pci_dev *pdev)
+{
+	if (!acpi_pci_power_manageable(pdev))
+		pdev->dev_flags |= PCI_DEV_FLAGS_NO_D3;
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x14b9, quirk_ryzen_rp_d3);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x14eb, quirk_ryzen_rp_d3);
 #endif
 
 /*
-- 
2.34.1