linux-kernel - [PATCH AUTOSEL 5.4 4/7] PCI/AER: Disable AER service on suspend

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Message-ID: <20240728161033.2054341-4-sashal@kernel.org>
Date: Sun, 28 Jul 2024 12:10:24 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kai-Heng Feng <kai.heng.feng@...onical.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Sasha Levin <sashal@...nel.org>,
	mahesh@...ux.ibm.com,
	linuxppc-dev@...ts.ozlabs.org,
	linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 4/7] PCI/AER: Disable AER service on suspend

From: Kai-Heng Feng <kai.heng.feng@...onical.com>

[ Upstream commit 5afc2f763edc5daae4722ee46fea4e627d01fa90 ]

If the link is powered off during suspend, electrical noise may cause
errors that are logged via AER.  If the AER interrupt is enabled and shares
an IRQ with PME, that causes a spurious wakeup during suspend.

Disable the AER interrupt during suspend to prevent this.  Clear error
status before re-enabling IRQ interrupts during resume so we don't get an
interrupt for errors that occurred during the suspend/resume process.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=209149
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216295
Link: https://bugzilla.kernel.org/show_bug.cgi?id=218090
Link: https://lore.kernel.org/r/20240416043225.1462548-2-kai.heng.feng@canonical.com
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
[bhelgaas: drop pci_ancestor_pr3_present() etc, commit log]
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/pcie/aer.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 6b5c9f7916fac..ee38ca162a7c8 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1407,6 +1407,22 @@ static int aer_probe(struct pcie_device *dev)
 	return 0;
 }
 
+static int aer_suspend(struct pcie_device *dev)
+{
+	struct aer_rpc *rpc = get_service_data(dev);
+
+	aer_disable_rootport(rpc);
+	return 0;
+}
+
+static int aer_resume(struct pcie_device *dev)
+{
+	struct aer_rpc *rpc = get_service_data(dev);
+
+	aer_enable_rootport(rpc);
+	return 0;
+}
+
 /**
  * aer_root_reset - reset link on Root Port
  * @dev: pointer to Root Port's pci_dev data structure
@@ -1447,6 +1463,8 @@ static struct pcie_port_service_driver aerdriver = {
 	.service	= PCIE_PORT_SERVICE_AER,
 
 	.probe		= aer_probe,
+	.suspend	= aer_suspend,
+	.resume		= aer_resume,
 	.remove		= aer_remove,
 	.reset_link	= aer_root_reset,
 };
-- 
2.43.0