mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Amey Narkhede](/assets/img/avatar_default.png)
"reset_fn" indicates whether the device supports any reset mechanism. Remove the use of reset_fn in favor of the reset_methods array that tracks supported reset mechanisms of a device and their ordering. The octeon driver incorrectly used reset_fn to detect whether the device supports FLR or not. Use pcie_reset_flr() to probe whether it supports FLR. Co-developed-by: Alex Williamson <alex.williamson@redhat.com> Link: https://lore.kernel.org/r/20210817180500.1253-5-ameynarkhede03@gmail.com Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Alex Williamson <alex.williamson@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
166 lines
3.7 KiB
C
166 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include "pci.h"
|
|
|
|
static void pci_free_resources(struct pci_dev *dev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < PCI_NUM_RESOURCES; i++) {
|
|
struct resource *res = dev->resource + i;
|
|
if (res->parent)
|
|
release_resource(res);
|
|
}
|
|
}
|
|
|
|
static void pci_stop_dev(struct pci_dev *dev)
|
|
{
|
|
pci_pme_active(dev, false);
|
|
|
|
if (pci_dev_is_added(dev)) {
|
|
|
|
device_release_driver(&dev->dev);
|
|
pci_proc_detach_device(dev);
|
|
pci_remove_sysfs_dev_files(dev);
|
|
|
|
pci_dev_assign_added(dev, false);
|
|
}
|
|
}
|
|
|
|
static void pci_destroy_dev(struct pci_dev *dev)
|
|
{
|
|
if (!dev->dev.kobj.parent)
|
|
return;
|
|
|
|
device_del(&dev->dev);
|
|
|
|
down_write(&pci_bus_sem);
|
|
list_del(&dev->bus_list);
|
|
up_write(&pci_bus_sem);
|
|
|
|
pcie_aspm_exit_link_state(dev);
|
|
pci_bridge_d3_update(dev);
|
|
pci_free_resources(dev);
|
|
put_device(&dev->dev);
|
|
}
|
|
|
|
void pci_remove_bus(struct pci_bus *bus)
|
|
{
|
|
pci_proc_detach_bus(bus);
|
|
|
|
down_write(&pci_bus_sem);
|
|
list_del(&bus->node);
|
|
pci_bus_release_busn_res(bus);
|
|
up_write(&pci_bus_sem);
|
|
pci_remove_legacy_files(bus);
|
|
|
|
if (bus->ops->remove_bus)
|
|
bus->ops->remove_bus(bus);
|
|
|
|
pcibios_remove_bus(bus);
|
|
device_unregister(&bus->dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_remove_bus);
|
|
|
|
static void pci_stop_bus_device(struct pci_dev *dev)
|
|
{
|
|
struct pci_bus *bus = dev->subordinate;
|
|
struct pci_dev *child, *tmp;
|
|
|
|
/*
|
|
* Stopping an SR-IOV PF device removes all the associated VFs,
|
|
* which will update the bus->devices list and confuse the
|
|
* iterator. Therefore, iterate in reverse so we remove the VFs
|
|
* first, then the PF.
|
|
*/
|
|
if (bus) {
|
|
list_for_each_entry_safe_reverse(child, tmp,
|
|
&bus->devices, bus_list)
|
|
pci_stop_bus_device(child);
|
|
}
|
|
|
|
pci_stop_dev(dev);
|
|
}
|
|
|
|
static void pci_remove_bus_device(struct pci_dev *dev)
|
|
{
|
|
struct pci_bus *bus = dev->subordinate;
|
|
struct pci_dev *child, *tmp;
|
|
|
|
if (bus) {
|
|
list_for_each_entry_safe(child, tmp,
|
|
&bus->devices, bus_list)
|
|
pci_remove_bus_device(child);
|
|
|
|
pci_remove_bus(bus);
|
|
dev->subordinate = NULL;
|
|
}
|
|
|
|
pci_destroy_dev(dev);
|
|
}
|
|
|
|
/**
|
|
* pci_stop_and_remove_bus_device - remove a PCI device and any children
|
|
* @dev: the device to remove
|
|
*
|
|
* Remove a PCI device from the device lists, informing the drivers
|
|
* that the device has been removed. We also remove any subordinate
|
|
* buses and children in a depth-first manner.
|
|
*
|
|
* For each device we remove, delete the device structure from the
|
|
* device lists, remove the /proc entry, and notify userspace
|
|
* (/sbin/hotplug).
|
|
*/
|
|
void pci_stop_and_remove_bus_device(struct pci_dev *dev)
|
|
{
|
|
pci_stop_bus_device(dev);
|
|
pci_remove_bus_device(dev);
|
|
}
|
|
EXPORT_SYMBOL(pci_stop_and_remove_bus_device);
|
|
|
|
void pci_stop_and_remove_bus_device_locked(struct pci_dev *dev)
|
|
{
|
|
pci_lock_rescan_remove();
|
|
pci_stop_and_remove_bus_device(dev);
|
|
pci_unlock_rescan_remove();
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_stop_and_remove_bus_device_locked);
|
|
|
|
void pci_stop_root_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *child, *tmp;
|
|
struct pci_host_bridge *host_bridge;
|
|
|
|
if (!pci_is_root_bus(bus))
|
|
return;
|
|
|
|
host_bridge = to_pci_host_bridge(bus->bridge);
|
|
list_for_each_entry_safe_reverse(child, tmp,
|
|
&bus->devices, bus_list)
|
|
pci_stop_bus_device(child);
|
|
|
|
/* stop the host bridge */
|
|
device_release_driver(&host_bridge->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_stop_root_bus);
|
|
|
|
void pci_remove_root_bus(struct pci_bus *bus)
|
|
{
|
|
struct pci_dev *child, *tmp;
|
|
struct pci_host_bridge *host_bridge;
|
|
|
|
if (!pci_is_root_bus(bus))
|
|
return;
|
|
|
|
host_bridge = to_pci_host_bridge(bus->bridge);
|
|
list_for_each_entry_safe(child, tmp,
|
|
&bus->devices, bus_list)
|
|
pci_remove_bus_device(child);
|
|
pci_remove_bus(bus);
|
|
host_bridge->bus = NULL;
|
|
|
|
/* remove the host bridge */
|
|
device_del(&host_bridge->dev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_remove_root_bus);
|