linux-kernel - [PATCH 3/4] PCI/AER: Expose AER panic state via pci_aer_panic

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Message-Id: <20250516165518.125495-4-18255117159@163.com>
Date: Sat, 17 May 2025 00:55:17 +0800
From: Hans Zhang <18255117159@....com>
To: bhelgaas@...gle.com,
	tglx@...utronix.de,
	kw@...ux.com,
	manivannan.sadhasivam@...aro.org,
	mahesh@...ux.ibm.com
Cc: oohall@...il.com,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	Hans Zhang <hans.zhang@...tech.com>
Subject: [PATCH 3/4] PCI/AER: Expose AER panic state via pci_aer_panic_enabled()

From: Hans Zhang <hans.zhang@...tech.com>

Add pci_aer_panic_enabled() to check if aer_panic is enabled system-wide.
Export the function for use in error recovery logic.

Signed-off-by: Hans Zhang <hans.zhang@...tech.com>
---
 drivers/pci/pci.h      |  2 ++
 drivers/pci/pcie/aer.c | 12 ++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 8ddfc1677eeb..f92928dadc6a 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -959,6 +959,7 @@ static inline void of_pci_remove_host_bridge_node(struct pci_host_bridge *bridge
 #ifdef CONFIG_PCIEAER
 void pci_no_aer(void);
 void pci_aer_panic(void);
+bool pci_aer_panic_enabled(void);
 void pci_aer_init(struct pci_dev *dev);
 void pci_aer_exit(struct pci_dev *dev);
 extern const struct attribute_group aer_stats_attr_group;
@@ -970,6 +971,7 @@ void pci_restore_aer_state(struct pci_dev *dev);
 #else
 static inline void pci_no_aer(void) { }
 static inline void pci_aer_panic(void) { }
+static inline bool pci_aer_panic_enabled(void) { return false; }
 static inline void pci_aer_init(struct pci_dev *d) { }
 static inline void pci_aer_exit(struct pci_dev *d) { }
 static inline void pci_aer_clear_fatal_status(struct pci_dev *dev) { }
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index fa51fb8a5fe7..4fd7db90b77c 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -125,6 +125,18 @@ void pci_aer_panic(void)
 	pcie_aer_panic = true;
 }
 
+/**
+ * pci_aer_panic_enabled() - Are AER panic enabled system-wide?
+ *
+ * Return: true if AER panic has not been globally disabled through ACPI FADT,
+ * PCI bridge quirks, or the "pci=aer_panic" kernel command-line option.
+ */
+bool pci_aer_panic_enabled(void)
+{
+	return pcie_aer_panic;
+}
+EXPORT_SYMBOL(pci_aer_panic_enabled);
+
 bool pci_aer_available(void)
 {
 	return !pcie_aer_disable && pci_msi_enabled();
-- 
2.25.1