[RFC PATCH 11/14] AER/PCI: use PCIe cap access functions to simplify implementation

[Jiang Liu]

From: Jiang Liu <jiang.liu@xxxxxxxxxx>

Use PCIe cap access functions to simplify PCI AER implementation.

Signed-off-by: Jiang Liu <liuj97@xxxxxxxxx>
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
 drivers/pci/pcie/aer/aerdrv.c      |   16 ++++++-------
 drivers/pci/pcie/aer/aerdrv_core.c |   45 ++++++++++++++----------------------
 2 files changed, 24 insertions(+), 37 deletions(-)

diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c
index f7c6245..27ec1bb 100644
--- a/drivers/pci/pcie/aer/aerdrv.c
+++ b/drivers/pci/pcie/aer/aerdrv.c
@@ -122,19 +122,18 @@ static void set_downstream_devices_error_reporting(struct pci_dev *dev,
 static void aer_enable_rootport(struct aer_rpc *rpc)
 {
 	struct pci_dev *pdev = rpc->rpd->port;
-	int pos, aer_pos;
+	int aer_pos;
 	u16 reg16;
 	u32 reg32;
 
-	pos = pci_pcie_cap(pdev);
 	/* Clear PCIe Capability's Device Status */
-	pci_read_config_word(pdev, pos+PCI_EXP_DEVSTA, &reg16);
-	pci_write_config_word(pdev, pos+PCI_EXP_DEVSTA, reg16);
+	pci_pcie_cap_read_word(pdev, PCI_EXP_DEVSTA, &reg16);
+	pci_pcie_cap_write_word(pdev, PCI_EXP_DEVSTA, reg16);
 
 	/* Disable system error generation in response to error messages */
-	pci_read_config_word(pdev, pos + PCI_EXP_RTCTL, &reg16);
+	pci_pcie_cap_read_word(pdev, PCI_EXP_RTCTL, &reg16);
 	reg16 &= ~(SYSTEM_ERROR_INTR_ON_MESG_MASK);
-	pci_write_config_word(pdev, pos + PCI_EXP_RTCTL, reg16);
+	pci_pcie_cap_write_word(pdev, PCI_EXP_RTCTL, reg16);
 
 	aer_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ERR);
 	/* Clear error status */
@@ -396,9 +395,8 @@ static void aer_error_resume(struct pci_dev *dev)
 	u16 reg16;
 
 	/* Clean up Root device status */
-	pos = pci_pcie_cap(dev);
-	pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);
-	pci_write_config_word(dev, pos + PCI_EXP_DEVSTA, reg16);
+	pci_pcie_cap_read_word(dev, PCI_EXP_DEVSTA, &reg16);
+	pci_pcie_cap_write_word(dev, PCI_EXP_DEVSTA, reg16);
 
 	/* Clean AER Root Error Status */
 	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index f551534..5671fce 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -35,25 +35,20 @@ module_param(nosourceid, bool, 0);
 int pci_enable_pcie_error_reporting(struct pci_dev *dev)
 {
 	u16 reg16 = 0;
-	int pos;
 
 	if (pcie_aer_get_firmware_first(dev))
 		return -EIO;
 
-	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
-	if (!pos)
-		return -EIO;
-
-	pos = pci_pcie_cap(dev);
-	if (!pos)
+	if (!pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))
 		return -EIO;
 
-	pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
-	reg16 |= (PCI_EXP_DEVCTL_CERE |
-		PCI_EXP_DEVCTL_NFERE |
-		PCI_EXP_DEVCTL_FERE |
-		PCI_EXP_DEVCTL_URRE);
-	pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
+	if (!pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &reg16)) {
+		reg16 |= (PCI_EXP_DEVCTL_CERE |
+			PCI_EXP_DEVCTL_NFERE |
+			PCI_EXP_DEVCTL_FERE |
+			PCI_EXP_DEVCTL_URRE);
+		pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, reg16);
+	}
 
 	return 0;
 }
@@ -62,21 +57,17 @@ EXPORT_SYMBOL_GPL(pci_enable_pcie_error_reporting);
 int pci_disable_pcie_error_reporting(struct pci_dev *dev)
 {
 	u16 reg16 = 0;
-	int pos;
 
 	if (pcie_aer_get_firmware_first(dev))
 		return -EIO;
 
-	pos = pci_pcie_cap(dev);
-	if (!pos)
-		return -EIO;
-
-	pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
-	reg16 &= ~(PCI_EXP_DEVCTL_CERE |
-		PCI_EXP_DEVCTL_NFERE |
-		PCI_EXP_DEVCTL_FERE |
-		PCI_EXP_DEVCTL_URRE);
-	pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, reg16);
+	if (!pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &reg16)) {
+		reg16 &= ~(PCI_EXP_DEVCTL_CERE |
+			PCI_EXP_DEVCTL_NFERE |
+			PCI_EXP_DEVCTL_FERE |
+			PCI_EXP_DEVCTL_URRE);
+		pci_pcie_cap_write_word(dev, PCI_EXP_DEVCTL, reg16);
+	}
 
 	return 0;
 }
@@ -151,18 +142,16 @@ static bool is_error_source(struct pci_dev *dev, struct aer_err_info *e_info)
 	 */
 	if (atomic_read(&dev->enable_cnt) == 0)
 		return false;
-	pos = pci_pcie_cap(dev);
-	if (!pos)
-		return false;
 
 	/* Check if AER is enabled */
-	pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &reg16);
+	pci_pcie_cap_read_word(dev, PCI_EXP_DEVCTL, &reg16);
 	if (!(reg16 & (
 		PCI_EXP_DEVCTL_CERE |
 		PCI_EXP_DEVCTL_NFERE |
 		PCI_EXP_DEVCTL_FERE |
 		PCI_EXP_DEVCTL_URRE)))
 		return false;
+
 	pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
 	if (!pos)
 		return false;
-- 
1.7.9.5

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