linux-kernel - [PATCH v13 22/25] CXL/PCI: Export and rename merge_result() to pci_ers_merge

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Message-ID: <20251104001001.3833651-23-terry.bowman@amd.com>
Date: Mon, 3 Nov 2025 18:09:58 -0600
From: Terry Bowman <terry.bowman@....com>
To: <dave@...olabs.net>, <jonathan.cameron@...wei.com>,
	<dave.jiang@...el.com>, <alison.schofield@...el.com>,
	<dan.j.williams@...el.com>, <bhelgaas@...gle.com>, <shiju.jose@...wei.com>,
	<ming.li@...omail.com>, <Smita.KoralahalliChannabasappa@....com>,
	<rrichter@....com>, <dan.carpenter@...aro.org>,
	<PradeepVineshReddy.Kodamati@....com>, <lukas@...ner.de>,
	<Benjamin.Cheatham@....com>, <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	<linux-cxl@...r.kernel.org>, <alucerop@....com>, <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<terry.bowman@....com>
Subject: [PATCH v13 22/25] CXL/PCI: Export and rename merge_result() to pci_ers_merge_result()

CXL uncorrectable errors (UCE) will soon be handled separately from the PCI
AER handling. The merge_result() function can be made common to use in both
handling paths.

Rename the PCI subsystem's merge_result() to be pci_ers_merge_result().
Export pci_ers_merge_result() to make available for the CXL and other
drivers to use.

Update pci_ers_merge_result() to support recently introduced PCI_ERS_RESULT_PANIC
result.

Signed-off-by: Terry Bowman <terry.bowman@....com>

---

Changes in v12->v13:
- Renamed pci_ers_merge_result() to pcie_ers_merge_result().
  pci_ers_merge_result() is already used in eeh driver. (Bot)

Changes in v11->v12:
- Remove static inline pci_ers_merge_result() definition for !CONFIG_PCIEAER.
  Is not needed. (Lukas)

Changes in v10->v11:
- New patch
- pci_ers_merge_result() - Change export to non-namespace and rename
  to be pci_ers_merge_result()
- Move pci_ers_merge_result() definition to pci.h. Needs pci_ers_result
---
 drivers/pci/pcie/err.c | 14 +++++++++-----
 include/linux/pci.h    |  7 +++++++
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index bebe4bc111d7..9394bbdcf0fb 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -21,9 +21,12 @@
 #include "portdrv.h"
 #include "../pci.h"
 
-static pci_ers_result_t merge_result(enum pci_ers_result orig,
-				  enum pci_ers_result new)
+pci_ers_result_t pcie_ers_merge_result(enum pci_ers_result orig,
+				       enum pci_ers_result new)
 {
+	if (new == PCI_ERS_RESULT_PANIC)
+		return PCI_ERS_RESULT_PANIC;
+
 	if (new == PCI_ERS_RESULT_NO_AER_DRIVER)
 		return PCI_ERS_RESULT_NO_AER_DRIVER;
 
@@ -45,6 +48,7 @@ static pci_ers_result_t merge_result(enum pci_ers_result orig,
 
 	return orig;
 }
+EXPORT_SYMBOL(pcie_ers_merge_result);
 
 static int report_error_detected(struct pci_dev *dev,
 				 pci_channel_state_t state,
@@ -81,7 +85,7 @@ static int report_error_detected(struct pci_dev *dev,
 		vote = err_handler->error_detected(dev, state);
 	}
 	pci_uevent_ers(dev, vote);
-	*result = merge_result(*result, vote);
+	*result = pcie_ers_merge_result(*result, vote);
 	device_unlock(&dev->dev);
 	return 0;
 }
@@ -139,7 +143,7 @@ static int report_mmio_enabled(struct pci_dev *dev, void *data)
 
 	err_handler = pdrv->err_handler;
 	vote = err_handler->mmio_enabled(dev);
-	*result = merge_result(*result, vote);
+	*result = pcie_ers_merge_result(*result, vote);
 out:
 	device_unlock(&dev->dev);
 	return 0;
@@ -159,7 +163,7 @@ static int report_slot_reset(struct pci_dev *dev, void *data)
 
 	err_handler = pdrv->err_handler;
 	vote = err_handler->slot_reset(dev);
-	*result = merge_result(*result, vote);
+	*result = pcie_ers_merge_result(*result, vote);
 out:
 	device_unlock(&dev->dev);
 	return 0;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 33d16b212e0d..d3e3300f79ec 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1887,9 +1887,16 @@ static inline void pci_hp_unignore_link_change(struct pci_dev *pdev) { }
 #ifdef CONFIG_PCIEAER
 bool pci_aer_available(void);
 void pcie_clear_device_status(struct pci_dev *dev);
+pci_ers_result_t pcie_ers_merge_result(enum pci_ers_result orig,
+				       enum pci_ers_result new);
 #else
 static inline bool pci_aer_available(void) { return false; }
 static inline void pcie_clear_device_status(struct pci_dev *dev) { }
+static inline pci_ers_result_t pcie_ers_merge_result(enum pci_ers_result orig,
+						     enum pci_ers_result new)
+{
+	return PCI_ERS_RESULT_NONE;
+}
 #endif
 
 bool pci_ats_disabled(void);
-- 
2.34.1