Commit 800ce277 authored by Bjorn Helgaas's avatar Bjorn Helgaas
Browse files

PCI: Log debug messages about reset method 

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: default avatarBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: default avatarDave Jiang <dave.jiang@intel.com>
parent 2014c95a

drivers/pci/pci.c

+6 −1
Original line number Diff line number Diff line
@@ -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;

	}