linux-kernel - [PATCH v6 1/3] PCI/AER: Factor out interrupt toggling into helpers

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Message-Id: <20230512000014.118942-1-kai.heng.feng@canonical.com>
Date:   Fri, 12 May 2023 08:00:12 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     bhelgaas@...gle.com
Cc:     mika.westerberg@...ux.intel.com, koba.ko@...onical.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Mahesh J Salgaonkar <mahesh@...ux.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 1/3] PCI/AER: Factor out interrupt toggling into helpers

There are many places that enable and disable AER interrupt, so move
them into helpers.

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
v6:
 - No change.

v5:
 - Fix misspelling.

v4:
 - No change.

v3:
 - Correct subject.

v2:
 - New patch.

 drivers/pci/pcie/aer.c | 45 +++++++++++++++++++++++++-----------------
 1 file changed, 27 insertions(+), 18 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index f6c24ded134c..1420e1f27105 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1227,6 +1227,28 @@ static irqreturn_t aer_irq(int irq, void *context)
 	return IRQ_WAKE_THREAD;
 }
 
+static void aer_enable_irq(struct pci_dev *pdev)
+{
+	int aer = pdev->aer_cap;
+	u32 reg32;
+
+	/* Enable Root Port's interrupt in response to error messages */
+	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
+	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
+	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+}
+
+static void aer_disable_irq(struct pci_dev *pdev)
+{
+	int aer = pdev->aer_cap;
+	u32 reg32;
+
+	/* Disable Root's interrupt in response to error messages */
+	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
+	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
+	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+}
+
 /**
  * aer_enable_rootport - enable Root Port's interrupts when receiving messages
  * @rpc: pointer to a Root Port data structure
@@ -1256,10 +1278,7 @@ static void aer_enable_rootport(struct aer_rpc *rpc)
 	pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, &reg32);
 	pci_write_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, reg32);
 
-	/* Enable Root Port's interrupt in response to error messages */
-	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-	reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
-	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+	aer_enable_irq(pdev);
 }
 
 /**
@@ -1274,10 +1293,7 @@ static void aer_disable_rootport(struct aer_rpc *rpc)
 	int aer = pdev->aer_cap;
 	u32 reg32;
 
-	/* Disable Root's interrupt in response to error messages */
-	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-	reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
-	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_COMMAND, reg32);
+	aer_disable_irq(pdev);
 
 	/* Clear Root's error status reg */
 	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, &reg32);
@@ -1372,12 +1388,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 	 */
 	aer = root ? root->aer_cap : 0;
 
-	if ((host->native_aer || pcie_ports_native) && aer) {
-		/* Disable Root's interrupt in response to error messages */
-		pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-		reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
-		pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32);
-	}
+	if ((host->native_aer || pcie_ports_native) && aer)
+		aer_disable_irq(root);
 
 	if (type == PCI_EXP_TYPE_RC_EC || type == PCI_EXP_TYPE_RC_END) {
 		rc = pcie_reset_flr(dev, PCI_RESET_DO_RESET);
@@ -1396,10 +1408,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
 		pci_read_config_dword(root, aer + PCI_ERR_ROOT_STATUS, &reg32);
 		pci_write_config_dword(root, aer + PCI_ERR_ROOT_STATUS, reg32);
 
-		/* Enable Root Port's interrupt in response to error messages */
-		pci_read_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, &reg32);
-		reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
-		pci_write_config_dword(root, aer + PCI_ERR_ROOT_COMMAND, reg32);
+		aer_enable_irq(root);
 	}
 
 	return rc ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
-- 
2.34.1