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PCI/ERR: Add pci_walk_bridge() to pcie_do_recovery()

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

Link: https://lore.kernel.org/r/20201121001036.8560-10-sean.v.kelley@intel.com
Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> # non-native/no RCEC
Signed-off-by: Sean V Kelley <sean.v.kelley@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Sean V Kelley 2020-11-20 16:10:30 -08:00 committed by Bjorn Helgaas
parent 3d7d8fc78f
commit 05e9ae19ab
1 changed files with 23 additions and 7 deletions
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30
drivers/pci/pcie/err.c
View file

@ -146,13 +146,30 @@ 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_subordinates)(struct pci_dev *pdev))
{
int type = pci_pcie_type(dev);
struct pci_dev *bridge;
struct pci_bus *bus;
pci_ers_result_t status = PCI_ERS_RESULT_CAN_RECOVER;
/*
@ -165,23 +182,22 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
else
bridge = pci_upstream_bridge(dev);
bus = bridge->subordinate;
pci_dbg(bridge, "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_subordinates(bridge);
if (status != PCI_ERS_RESULT_RECOVERED) {
pci_warn(bridge, "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(bridge, "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) {
@ -192,14 +208,14 @@ pci_ers_result_t pcie_do_recovery(struct pci_dev *dev,
*/
status = PCI_ERS_RESULT_RECOVERED;
pci_dbg(bridge, "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(bridge, "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);