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PCI: Log debug messages about reset method

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Log pci_dbg() messages about the reset methods we attempt and any errors
(-ENOTTY means "try the next method").

Set CONFIG_DYNAMIC_DEBUG=y and enable by booting with
dyndbg="file drivers/pci/* +p" or enable at runtime:

  # echo "file drivers/pci/* +p" > /sys/kernel/debug/dynamic_debug/control

Link: https://lore.kernel.org/r/20250303204220.197172-1-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Bjorn Helgaas
2025-03-03 14:42:20 -06:00
parent 2014c95afe
commit 800ce277f4
1 changed files with 6 additions and 1 deletions
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drivers/pci/pci.c
+6 -1
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@@ -5230,6 +5230,7 @@ const struct pci_reset_fn_method pci_reset_fn_methods[] = {
int __pci_reset_function_locked(struct pci_dev *dev)
{
int i, m, rc;
const struct pci_reset_fn_method *method;
might_sleep();
@@ -5246,9 +5247,13 @@ int __pci_reset_function_locked(struct pci_dev *dev)
if (!m)
return -ENOTTY;
rc = pci_reset_fn_methods[m].reset_fn(dev, PCI_RESET_DO_RESET);
method = &pci_reset_fn_methods[m];
pci_dbg(dev, "reset via %s\n", method->name);
rc = method->reset_fn(dev, PCI_RESET_DO_RESET);
if (!rc)
return 0;
pci_dbg(dev, "%s failed with %d\n", method->name, rc);
if (rc != -ENOTTY)
return rc;
}