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From:   Zhuo Chen <chenzhuo.1@bytedance.com>
To:     bhelgaas@google.com, ruscur@russell.cc, oohall@gmail.com,
        fancer.lancer@gmail.com, jdmason@kudzu.us, dave.jiang@intel.com,
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        martin.petersen@oracle.com
Cc:     chenzhuo.1@bytedance.com, linuxppc-dev@lists.ozlabs.org,
        linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
        ntb@lists.linux.dev, linux-scsi@vger.kernel.org
Subject: [PATCH v2 1/9] PCI/AER: Add pci_aer_clear_uncorrect_error_status() to PCI core
Date:   Tue, 27 Sep 2022 23:35:16 +0800
Message-Id: <20220927153524.49172-2-chenzhuo.1@bytedance.com>
In-Reply-To: <20220927153524.49172-1-chenzhuo.1@bytedance.com>
References: <20220927153524.49172-1-chenzhuo.1@bytedance.com>
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Sometimes we need to clear aer uncorrectable error status, so we add
pci_aer_clear_uncorrect_error_status() to PCI core.

Signed-off-by: Zhuo Chen <chenzhuo.1@bytedance.com>
---
 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)