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From: Sean V Kelley <seanvk.dev@oregontracks.org>
To: bhelgaas@google.com, Jonathan.Cameron@huawei.com,
	rafael.j.wysocki@intel.com, ashok.raj@intel.com,
	tony.luck@intel.com, sathyanarayanan.kuppuswamy@intel.com,
	qiuxu.zhuo@intel.com
Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	Sean V Kelley <sean.v.kelley@intel.com>
Subject: [PATCH v8 06/14] PCI/ERR: Add pci_walk_bridge() to pcie_do_recovery()
Date: Fri,  2 Oct 2020 11:47:27 -0700
Message-ID: <20201002184735.1229220-7-seanvk.dev@oregontracks.org> (raw)
In-Reply-To: <20201002184735.1229220-1-seanvk.dev@oregontracks.org>

From: Sean V Kelley <sean.v.kelley@intel.com>

Consolidate subordinate bus checks with pci_walk_bus()
into pci_walk_bridge() for walking below potentially
AER affected bridges.

Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
---
 drivers/pci/pcie/err.c | 29 ++++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index e68ea5243ff2..9b2130725ab6 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -146,12 +146,28 @@ static int report_resume(struct pci_dev *dev, void *data)
 	return 0;
 }
 
+/**
+ * pci_walk_bridge - walk bridges potentially AER affected
+ * @bridge   bridge which may be a Port.
+ * @cb       callback to be called for each device found
+ * @userdata arbitrary pointer to be passed to callback.
+ *
+ * If the device provided is a bridge, walk the subordinate bus,
+ * including any bridged devices on buses under this bus.
+ * Call the provided callback on each device found.
+ */
+static void pci_walk_bridge(struct pci_dev *bridge, int (*cb)(struct pci_dev *, void *),
+			    void *userdata)
+{
+	if (bridge->subordinate)
+		pci_walk_bus(bridge->subordinate, cb, userdata);
+}
+
 pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 			pci_channel_state_t state,
 			pci_ers_result_t (*reset_subordinate_devices)(struct pci_dev *pdev))
 {
 	pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
-	struct pci_bus *bus;
 	struct pci_dev *bridge;
 	int type;
 
@@ -167,23 +183,22 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 	else
 		bridge = pci_upstream_bridge(dev);
 
-	bus = bridge->subordinate;
 	pci_dbg(dev, "broadcast error_detected message\n");
 	if (state == pci_channel_io_frozen) {
-		pci_walk_bus(bus, report_frozen_detected, &status);
+		pci_walk_bridge(bridge, report_frozen_detected, &status);
 		status = reset_subordinate_device(bridge);
 		if (status != PCI_ERS_RESULT_RECOVERED) {
 			pci_warn(dev, "subordinate device reset failed\n");
 			goto failed;
 		}
 	} else {
-		pci_walk_bus(bus, report_normal_detected, &status);
+		pci_walk_bridge(bridge, report_normal_detected, &status);
 	}
 
 	if (status == PCI_ERS_RESULT_CAN_RECOVER) {
 		status = PCI_ERS_RESULT_RECOVERED;
 		pci_dbg(dev, "broadcast mmio_enabled message\n");
-		pci_walk_bus(bus, report_mmio_enabled, &status);
+		pci_walk_bridge(bridge, report_mmio_enabled, &status);
 	}
 
 	if (status == PCI_ERS_RESULT_NEED_RESET) {
@@ -194,14 +209,14 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
 		 */
 		status = PCI_ERS_RESULT_RECOVERED;
 		pci_dbg(dev, "broadcast slot_reset message\n");
-		pci_walk_bus(bus, report_slot_reset, &status);
+		pci_walk_bridge(bridge, report_slot_reset, &status);
 	}
 
 	if (status != PCI_ERS_RESULT_RECOVERED)
 		goto failed;
 
 	pci_dbg(dev, "broadcast resume message\n");
-	pci_walk_bus(bus, report_resume, &status);
+	pci_walk_bridge(bridge, report_resume, &status);
 
 	if (pcie_aer_is_native(bridge))
 		pcie_clear_device_status(bridge);
-- 
2.28.0


  parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-02 18:47 [PATCH v8 00/14] Add RCEC handling to PCI/AER Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 01/14] PCI/RCEC: Add RCEC class code and extended capability Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 02/14] PCI/RCEC: Bind RCEC devices to the Root Port driver Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 03/14] PCI/RCEC: Cache RCEC capabilities in pci_init_capabilities() Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 04/14] PCI/ERR: Rename reset_link() to reset_subordinate_device() Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 05/14] PCI/ERR: Use "bridge" for clarity in pcie_do_recovery() Sean V Kelley
2020-10-02 18:47 ` Sean V Kelley [this message]
2020-10-02 18:47 ` [PATCH v8 07/14] PCI/ERR: Limit AER resets " Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 08/14] PCI/AER: Extend AER error handling to RCECs Sean V Kelley
2020-10-09 21:27   ` Bjorn Helgaas
2020-10-09 21:54     ` Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 09/14] PCI/AER: Apply function level reset to RCiEP on fatal error Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 10/14] PCI/RCEC: Add pcie_link_rcec() to associate RCiEPs Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 11/14] PCI/RCEC: Add RCiEP's linked RCEC to AER/ERR Sean V Kelley
2020-10-09 17:57   ` Bjorn Helgaas
2020-10-09 18:26     ` Sean V Kelley
2020-10-09 18:34       ` Sean V Kelley
2020-10-09 18:53         ` Sean V Kelley
2020-10-09 19:48           ` Sean V Kelley
2020-10-09 21:30     ` Bjorn Helgaas
2020-10-09 22:07       ` Sean V Kelley
2020-10-09 23:51         ` Kelley, Sean V
2020-10-12 22:58           ` Bjorn Helgaas
2020-10-13 16:55             ` Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 12/14] PCI/AER: Add pcie_walk_rcec() to RCEC AER handling Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 13/14] PCI/PME: Add pcie_walk_rcec() to RCEC PME handling Sean V Kelley
2020-10-02 18:47 ` [PATCH v8 14/14] PCI/AER: Add RCEC AER error injection support Sean V Kelley
2020-10-09 15:53 ` [PATCH v8 00/14] Add RCEC handling to PCI/AER Bjorn Helgaas

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