/**
* eeh_reset_device - Perform actual reset of a pci slot
* @edev: PE associated EEH device
* @bus: PCI bus corresponding to the isolcated slot
*
* This routine must be called to do reset on the indicated PE.
* During the reset, udev might be invoked because those affected
* PCI devices will be removed and then added.
*/
static int eeh_reset_device(struct eeh_dev *edev, struct pci_bus *bus)
{
struct device_node *dn;
int cnt, rc;
/* pcibios will clear the counter; save the value */
cnt = edev->freeze_count;
if (bus)
pcibios_remove_pci_devices(bus);
/* Reset the pci controller. (Asserts RST#; resets config space).
* Reconfigure bridges and devices. Don't try to bring the system
* up if the reset failed for some reason.
*/
rc = eeh_reset_pe(edev);
if (rc)
return rc;
/* Walk over all functions on this device. */
dn = eeh_dev_to_of_node(edev);
if (!pcibios_find_pci_bus(dn) && of_node_to_eeh_dev(dn->parent))
dn = dn->parent->child;
while (dn) {
struct eeh_dev *pedev = of_node_to_eeh_dev(dn);
/* On Power4, always true because eeh_pe_config_addr=0 */
if (edev->pe_config_addr == pedev->pe_config_addr) {
eeh_ops->configure_bridge(dn);
eeh_restore_bars(pedev);
}
dn = dn->sibling;
}
/* Give the system 5 seconds to finish running the user-space
* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
* this is a hack, but if we don't do this, and try to bring
* the device up before the scripts have taken it down,
* potentially weird things happen.
*/
if (bus) {
ssleep(5);
pcibios_add_pci_devices(bus);
}
edev->freeze_count = cnt;
return 0;
}
static int eeh_reset_device(struct eeh_dev *edev, struct pci_bus *bus)
{
struct device_node *dn;
int cnt, rc;
cnt = edev->freeze_count;
if (bus)
pcibios_remove_pci_devices(bus);
rc = eeh_reset_pe(edev);
if (rc)
return rc;
dn = eeh_dev_to_of_node(edev);
if (!pcibios_find_pci_bus(dn) && of_node_to_eeh_dev(dn->parent))
dn = dn->parent->child;
while (dn) {
struct eeh_dev *pedev = of_node_to_eeh_dev(dn);
if (edev->pe_config_addr == pedev->pe_config_addr) {
eeh_ops->configure_bridge(dn);
eeh_restore_bars(pedev);
}
dn = dn->sibling;
}
if (bus) {
ssleep(5);
pcibios_add_pci_devices(bus);
}
edev->freeze_count = cnt;
return 0;
}
/**
* eeh_reset_device - Perform actual reset of a pci slot
* @pe: EEH PE
* @bus: PCI bus corresponding to the isolcated slot
*
* This routine must be called to do reset on the indicated PE.
* During the reset, udev might be invoked because those affected
* PCI devices will be removed and then added.
*/
static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
{
struct pci_bus *frozen_bus = eeh_pe_bus_get(pe);
struct timeval tstamp;
int cnt, rc, removed = 0;
/* pcibios will clear the counter; save the value */
cnt = pe->freeze_count;
tstamp = pe->tstamp;
/*
* We don't remove the corresponding PE instances because
* we need the information afterwords. The attached EEH
* devices are expected to be attached soon when calling
* into pcibios_add_pci_devices().
*/
eeh_pe_state_mark(pe, EEH_PE_KEEP);
if (bus) {
pci_lock_rescan_remove();
pcibios_remove_pci_devices(bus);
pci_unlock_rescan_remove();
} else if (frozen_bus) {
eeh_pe_dev_traverse(pe, eeh_rmv_device, &removed);
}
/*
* Reset the pci controller. (Asserts RST#; resets config space).
* Reconfigure bridges and devices. Don't try to bring the system
* up if the reset failed for some reason.
*
* During the reset, it's very dangerous to have uncontrolled PCI
* config accesses. So we prefer to block them. However, controlled
* PCI config accesses initiated from EEH itself are allowed.
*/
eeh_pe_state_mark(pe, EEH_PE_RESET);
rc = eeh_reset_pe(pe);
if (rc) {
eeh_pe_state_clear(pe, EEH_PE_RESET);
return rc;
}
pci_lock_rescan_remove();
/* Restore PE */
eeh_ops->configure_bridge(pe);
eeh_pe_restore_bars(pe);
eeh_pe_state_clear(pe, EEH_PE_RESET);
/* Clear frozen state */
rc = eeh_clear_pe_frozen_state(pe);
if (rc)
return rc;
/* Give the system 5 seconds to finish running the user-space
* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
* this is a hack, but if we don't do this, and try to bring
* the device up before the scripts have taken it down,
* potentially weird things happen.
*/
if (bus) {
pr_info("EEH: Sleep 5s ahead of complete hotplug\n");
ssleep(5);
/*
* The EEH device is still connected with its parent
* PE. We should disconnect it so the binding can be
* rebuilt when adding PCI devices.
*/
eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL);
pcibios_add_pci_devices(bus);
} else if (frozen_bus && removed) {
pr_info("EEH: Sleep 5s ahead of partial hotplug\n");
ssleep(5);
eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL);
pcibios_add_pci_devices(frozen_bus);
}
eeh_pe_state_clear(pe, EEH_PE_KEEP);
pe->tstamp = tstamp;
pe->freeze_count = cnt;
pci_unlock_rescan_remove();
return 0;
}
