linux-kernel - [PATCH v2] PCI/ERR: Use pcie_aer_is_native() to judge whether OS owns AER

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Message-Id: <20220726020527.99816-1-chenzhuo.1@bytedance.com>
Date:   Tue, 26 Jul 2022 10:05:27 +0800
From:   Zhuo Chen <chenzhuo.1@...edance.com>
To:     ruscur@...sell.cc, oohall@...il.com, bhelgaas@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Cc:     chenzhuo.1@...edance.com, lukas@...ner.de, jan.kiszka@...mens.com,
        stuart.w.hayes@...il.com, linuxppc-dev@...ts.ozlabs.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] PCI/ERR: Use pcie_aer_is_native() to judge whether OS owns AER

The AER status of the device that reported the error rather than
the first downstream port is cleared after commit 7d7cbeaba5b7
("PCI/ERR: Clear status of the reporting device"). So "a bridge
may not exist" which commit aa344bc8b727 ("PCI/ERR: Clear AER
status only when we control AER") referring to is no longer
existent, and we just use pcie_aer_is_native() in stead of
"host->native_aer || pcie_ports_native".

pci_aer_clear_nonfatal_status() already has pcie_aer_is_native(),
so we move pci_aer_clear_nonfatal_status() out of
pcie_aer_is_native().

Replace statements that judge whether OS owns AER in
get_port_device_capability() with pcie_aer_is_native(), which has
no functional changes.

Signed-off-by: Zhuo Chen <chenzhuo.1@...edance.com>
---
v2:
- Add details and note in commit log
---
 drivers/pci/pcie/err.c          | 12 ++----------
 drivers/pci/pcie/portdrv_core.c |  3 +--
 2 files changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index 0c5a143025af..28339c741555 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -184,7 +184,6 @@ 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,
@@ -237,16 +236,9 @@ 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) {
+	if (pcie_aer_is_native(dev))
 		pcie_clear_device_status(dev);
-		pci_aer_clear_nonfatal_status(dev);
-	}
+	pci_aer_clear_nonfatal_status(dev);
 	pci_info(bridge, "device recovery successful\n");
 	return status;
 
diff --git a/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 604feeb84ee4..98c18f4a01b2 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -221,8 +221,7 @@ static int get_port_device_capability(struct pci_dev *dev)
 	}
 
 #ifdef CONFIG_PCIEAER
-	if (dev->aer_cap && pci_aer_available() &&
-	    (pcie_ports_native || host->native_aer)) {
+	if (pcie_aer_is_native(dev) && pci_aer_available()) {
 		services |= PCIE_PORT_SERVICE_AER;
 
 		/*
-- 
2.30.1 (Apple Git-130)