Thread (23 messages) 23 messages, 4 authors, 2023-03-30

Re: [PATCH v3 1/9] PCI/AER: Add pci_aer_clear_uncorrect_error_status() to PCI core

From: Bjorn Helgaas <helgaas@kernel.org>
Date: 2023-03-15 21:30:01
Also in: linux-pci, linux-scsi, lkml

On Wed, Sep 28, 2022 at 06:59:38PM +0800, Zhuo Chen wrote:
In lpfc_aer_cleanup_state(), uncorrectable error status needs to be
cleared, which can be done by calling pci_aer_clear_nonfatal_status()
and pci_aer_clear_fatal_status(). Meanwhile they can be combined in
one function (the same in dpc_process_error). So add
pci_aer_clear_uncorrect_error_status() function to PCI core and
export symbol to other modules which wants to use it.
Sorry for getting back to this so late.

Why does lpfc need this?  I think AER error status should be cleared
by the PCI core, not by individual drivers, so I really would rather
not add a new interface for drivers to use.
quoted hunk ↗ jump to hunk
Signed-off-by: Zhuo Chen <redacted>
---
 drivers/pci/pcie/aer.c | 16 ++++++++++++++++
 include/linux/aer.h    |  5 +++++
 2 files changed, 21 insertions(+)
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index e2d8a74f83c3..4e637121be23 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -286,6 +286,22 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
 		pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
 }
 
+int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
+{
+	int aer = dev->aer_cap;
+	u32 status;
+
+	if (!pcie_aer_is_native(dev))
+		return -EIO;
+
+	pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, &status);
+	if (status)
+		pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_STATUS, status);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_aer_clear_uncorrect_error_status);
+
 /**
  * pci_aer_raw_clear_status - Clear AER error registers.
  * @dev: the PCI device
diff --git a/include/linux/aer.h b/include/linux/aer.h
index 97f64ba1b34a..154690c278cb 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -45,6 +45,7 @@ struct aer_capability_regs {
 int pci_enable_pcie_error_reporting(struct pci_dev *dev);
 int pci_disable_pcie_error_reporting(struct pci_dev *dev);
 int pci_aer_clear_nonfatal_status(struct pci_dev *dev);
+int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev);
 void pci_save_aer_state(struct pci_dev *dev);
 void pci_restore_aer_state(struct pci_dev *dev);
 #else
@@ -60,6 +61,10 @@ static inline int pci_aer_clear_nonfatal_status(struct pci_dev *dev)
 {
 	return -EINVAL;
 }
+static inline int pci_aer_clear_uncorrect_error_status(struct pci_dev *dev)
+{
+	return -EINVAL;
+}
 static inline void pci_save_aer_state(struct pci_dev *dev) {}
 static inline void pci_restore_aer_state(struct pci_dev *dev) {}
 #endif
-- 
2.30.1 (Apple Git-130)
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