Commit f331a859 authored by Alex Williamson's avatar Alex Williamson Committed by Bjorn Helgaas
Browse files

PCI: Add flag for devices where we can't use bus reset 

Enable a mechanism for devices to quirk that they do not behave when
doing a PCI bus reset.  We require a modest level of spec compliant
behavior in order to do a reset, for instance the device should come
out of reset without throwing errors and PCI config space should be
accessible after reset.  This is too much to ask for some devices.

Link: http://lkml.kernel.org/r/20140923210318.498dacbd@dualc.maya.org


Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v3.14+
parent 97bf6af1

drivers/pci/pci.c

+36 −4
Original line number Diff line number Diff line
@@ -3271,7 +3271,8 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe) 
{

	struct pci_dev *pdev;



	if (pci_is_root_bus(dev->bus) || dev->subordinate || !dev->bus->self)

	if (pci_is_root_bus(dev->bus) || dev->subordinate ||

	    !dev->bus->self || dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)

		return -ENOTTY;



	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
@@ -3305,7 +3306,8 @@ static int pci_dev_reset_slot_function(struct pci_dev *dev, int probe) 
{

	struct pci_dev *pdev;



	if (dev->subordinate || !dev->slot)

	if (dev->subordinate || !dev->slot ||

	    dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET)

		return -ENOTTY;



	list_for_each_entry(pdev, &dev->bus->devices, bus_list)
@@ -3557,6 +3559,20 @@ int pci_try_reset_function(struct pci_dev *dev) 
}

EXPORT_SYMBOL_GPL(pci_try_reset_function);



/* Do any devices on or below this bus prevent a bus reset? */

static bool pci_bus_resetable(struct pci_bus *bus)

{

	struct pci_dev *dev;



	list_for_each_entry(dev, &bus->devices, bus_list) {

		if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||

		    (dev->subordinate && !pci_bus_resetable(dev->subordinate)))

			return false;

	}



	return true;

}



/* Lock devices from the top of the tree down */

static void pci_bus_lock(struct pci_bus *bus)

{
@@ -3607,6 +3623,22 @@ unlock: 
	return 0;

}



/* Do any devices on or below this slot prevent a bus reset? */

static bool pci_slot_resetable(struct pci_slot *slot)

{

	struct pci_dev *dev;



	list_for_each_entry(dev, &slot->bus->devices, bus_list) {

		if (!dev->slot || dev->slot != slot)

			continue;

		if (dev->dev_flags & PCI_DEV_FLAGS_NO_BUS_RESET ||

		    (dev->subordinate && !pci_bus_resetable(dev->subordinate)))

			return false;

	}



	return true;

}



/* Lock devices from the top of the tree down */

static void pci_slot_lock(struct pci_slot *slot)

{
@@ -3728,7 +3760,7 @@ static int pci_slot_reset(struct pci_slot *slot, int probe) 
{

	int rc;



	if (!slot)

	if (!slot || !pci_slot_resetable(slot))

		return -ENOTTY;



	if (!probe)
@@ -3820,7 +3852,7 @@ EXPORT_SYMBOL_GPL(pci_try_reset_slot); 


static int pci_bus_reset(struct pci_bus *bus, int probe)

{

	if (!bus->self)

	if (!bus->self || !pci_bus_resetable(bus))

		return -ENOTTY;



	if (probe)

include/linux/pci.h

+2 −0
Original line number Diff line number Diff line
@@ -175,6 +175,8 @@ enum pci_dev_flags { 
	PCI_DEV_FLAGS_DMA_ALIAS_DEVFN = (__force pci_dev_flags_t) (1 << 4),

	/* Use a PCIe-to-PCI bridge alias even if !pci_is_pcie */

	PCI_DEV_FLAG_PCIE_BRIDGE_ALIAS = (__force pci_dev_flags_t) (1 << 5),

	/* Do not use bus resets for device */

	PCI_DEV_FLAGS_NO_BUS_RESET = (__force pci_dev_flags_t) (1 << 6),

};



enum pci_irq_reroute_variant {

CRA Git | Maintained and supported by SUSTech CRA and CCSE