linux-kernel - [PATCH v3 9/9] PCI/AER: Refine status clearing process with api

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Date:   Wed, 28 Sep 2022 18:59:46 +0800
From:   Zhuo Chen <chenzhuo.1@...edance.com>
To:     sathyanarayanan.kuppuswamy@...ux.intel.com, bhelgaas@...gle.com,
        ruscur@...sell.cc, oohall@...il.com, fancer.lancer@...il.com,
        jdmason@...zu.us, dave.jiang@...el.com, allenbh@...il.com,
        james.smart@...adcom.com, dick.kennedy@...adcom.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     chenzhuo.1@...edance.com, linuxppc-dev@...ts.ozlabs.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ntb@...ts.linux.dev, linux-scsi@...r.kernel.org
Subject: [PATCH v3 9/9] PCI/AER: Refine status clearing process with api

Statements clearing status in aer_enable_rootport() is functionally
equivalent with pcie_clear_device_status() and pci_aer_clear_status().
So replace them, which has no functional changes.

After commit 20e15e673b05 ("PCI/AER: Add pci_aer_raw_clear_status()
to unconditionally clear Error Status"), pci_aer_raw_clear_status()
is only used by the EDR path, so we add note in function comment.

Signed-off-by: Zhuo Chen <chenzhuo.1@...edance.com>
---
 drivers/pci/pcie/aer.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a6d29269ccf2..bd5ecfa4860f 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -306,6 +306,8 @@ EXPORT_SYMBOL_GPL(pci_aer_clear_uncorrect_error_status);
  * Clearing AER error status registers unconditionally, regardless of
  * whether they're owned by firmware or the OS.
  *
+ * Used only by the EDR path. Other paths should use pci_aer_clear_status().
+ *
  * Returns 0 on success, or negative on failure.
  */
 int pci_aer_raw_clear_status(struct pci_dev *dev)
@@ -1277,24 +1279,17 @@ static void aer_enable_rootport(struct aer_rpc *rpc)
 {
 	struct pci_dev *pdev = rpc->rpd;
 	int aer = pdev->aer_cap;
-	u16 reg16;
 	u32 reg32;
 
 	/* Clear PCIe Capability's Device Status */
-	pcie_capability_read_word(pdev, PCI_EXP_DEVSTA, &reg16);
-	pcie_capability_write_word(pdev, PCI_EXP_DEVSTA, reg16);
+	pcie_clear_device_status(pdev);
 
 	/* Disable system error generation in response to error messages */
 	pcie_capability_clear_word(pdev, PCI_EXP_RTCTL,
 				   SYSTEM_ERROR_INTR_ON_MESG_MASK);
 
 	/* Clear error status */
-	pci_read_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, &reg32);
-	pci_write_config_dword(pdev, aer + PCI_ERR_ROOT_STATUS, reg32);
-	pci_read_config_dword(pdev, aer + PCI_ERR_COR_STATUS, &reg32);
-	pci_write_config_dword(pdev, aer + PCI_ERR_COR_STATUS, reg32);
-	pci_read_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, &reg32);
-	pci_write_config_dword(pdev, aer + PCI_ERR_UNCOR_STATUS, reg32);
+	pci_aer_clear_status(pdev);
 
 	/*
 	 * Enable error reporting for the root port device and downstream port
-- 
2.30.1 (Apple Git-130)