linux-kernel - [PATCH v2 6/9] PCI/AER: Move check inside pcie_clear_device

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Date:   Tue, 27 Sep 2022 23:35:21 +0800
From:   Zhuo Chen <chenzhuo.1@...edance.com>
To:     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 v2 6/9] PCI/AER: Move check inside pcie_clear_device_status().

pcie_clear_device_status() doesn't check for pcie_aer_is_native()
internally, but after commit 068c29a248b6 ("PCI/ERR: Clear PCIe Device
Status errors only if OS owns AER") and commit aa344bc8b727 ("PCI/ERR:
Clear AER status only when we control AER"), both callers check before
calling it. So we move the check inside pcie_clear_device_status().

Signed-off-by: Zhuo Chen <chenzhuo.1@...edance.com>
---
 drivers/pci/pci.c      |  7 +++++--
 drivers/pci/pcie/aer.c |  4 ++--
 drivers/pci/pcie/err.c | 14 +++-----------
 3 files changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 95bc329e74c0..8caf4a5529a1 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2282,9 +2282,12 @@ EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
 void pcie_clear_device_status(struct pci_dev *dev)
 {
 	u16 sta;
+	struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
 
-	pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &sta);
-	pcie_capability_write_word(dev, PCI_EXP_DEVSTA, sta);
+	if (host->native_aer || pcie_ports_native) {
+		pcie_capability_read_word(dev, PCI_EXP_DEVSTA, &sta);
+		pcie_capability_write_word(dev, PCI_EXP_DEVSTA, sta);
+	}
 }
 #endif
 
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index e2ebd108339d..e2320ab27a31 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -971,11 +971,11 @@ static void handle_error_source(struct pci_dev *dev, struct aer_err_info *info)
 		 * Correctable error does not need software intervention.
 		 * No need to go through error recovery process.
 		 */
-		if (aer)
+		if (aer) {
 			pci_write_config_dword(dev, aer + PCI_ERR_COR_STATUS,
 					info->status);
-		if (pcie_aer_is_native(dev))
 			pcie_clear_device_status(dev);
+		}
 	} else if (info->severity == AER_NONFATAL)
 		pcie_do_recovery(dev, pci_channel_io_normal, aer_root_reset);
 	else if (info->severity == AER_FATAL)
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 59c90d04a609..f80b21244ef1 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -188,7 +188,6 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	int type = pci_pcie_type(dev);
 	struct pci_dev *bridge;
 	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
-	struct pci_host_bridge *host = pci_find_host_bridge(dev->bus);
 
 	/*
 	 * If the error was detected by a Root Port, Downstream Port, RCEC,
@@ -241,16 +240,9 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	pci_dbg(bridge, "broadcast resume message\n");
 	pci_walk_bridge(bridge, report_resume, &status);
 
-	/*
-	 * If we have native control of AER, clear error status in the device
-	 * that detected the error.  If the platform retained control of AER,
-	 * it is responsible for clearing this status.  In that case, the
-	 * signaling device may not even be visible to the OS.
-	 */
-	if (host->native_aer || pcie_ports_native) {
-		pcie_clear_device_status(dev);
-		pci_aer_clear_nonfatal_status(dev);
-	}
+	pcie_clear_device_status(dev);
+	pci_aer_clear_nonfatal_status(dev);
+
 	pci_info(bridge, "device recovery successful\n");
 	return status;
 
-- 
2.30.1 (Apple Git-130)