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powerpc/eeh: Do probe on pci_dn

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Originally, EEH core probes on device_node or pci_dev to populate
EEH devices and PEs, which conflicts with the fact: SRIOV VFs are
usually enabled and created by PF's driver and they don't have the
corresponding device_nodes. Instead, SRIOV VFs have dynamically
created pci_dn, which can be used for EEH probe.

The patch reworks EEH probe for PowerNV and pSeries platforms to
do probing based on pci_dn, instead of pci_dev or device_node any
more.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan
2015-03-17 16:15:06 +11:00
committed by Benjamin Herrenschmidt
parent e8e9b34cef
commit ff57b454dd
8 changed files with 172 additions and 138 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
arch/powerpc/kernel/eeh.c
View File

@ -969,7 +969,7 @@ static struct notifier_block eeh_reboot_nb = {
int eeh_init(void)
{
struct pci_controller *hose, *tmp;
struct device_node *phb;
struct pci_dn *pdn;
static int cnt = 0;
int ret = 0;
@ -1004,20 +1004,9 @@ int eeh_init(void)
return ret;
/* Enable EEH for all adapters */
if (eeh_has_flag(EEH_PROBE_MODE_DEVTREE)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node) {
phb = hose->dn;
traverse_pci_devices(phb, eeh_ops->of_probe, NULL);
}
} else if (eeh_has_flag(EEH_PROBE_MODE_DEV)) {
list_for_each_entry_safe(hose, tmp,
&hose_list, list_node)
pci_walk_bus(hose->bus, eeh_ops->dev_probe, NULL);
} else {
pr_warn("%s: Invalid probe mode %x",
__func__, eeh_subsystem_flags);
return -EINVAL;
list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
pdn = hose->pci_data;
traverse_pci_dn(pdn, eeh_ops->probe, NULL);
}
/*
@ -1043,7 +1032,7 @@ core_initcall_sync(eeh_init);
/**
* eeh_add_device_early - Enable EEH for the indicated device_node
* @dn: device node for which to set up EEH
* @pdn: PCI device node for which to set up EEH
*
* This routine must be used to perform EEH initialization for PCI
* devices that were added after system boot (e.g. hotplug, dlpar).
@ -1053,44 +1042,41 @@ core_initcall_sync(eeh_init);
* on the CEC architecture, type of the device, on earlier boot
* command-line arguments & etc.
*/
void eeh_add_device_early(struct device_node *dn)
void eeh_add_device_early(struct pci_dn *pdn)
{
struct pci_controller *phb;
struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
/*
* If we're doing EEH probe based on PCI device, we
* would delay the probe until late stage because
* the PCI device isn't available this moment.
*/
if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
if (!edev)
return;
if (!of_node_to_eeh_dev(dn))
return;
phb = of_node_to_eeh_dev(dn)->phb;
/* USB Bus children of PCI devices will not have BUID's */
if (NULL == phb || 0 == phb->buid)
phb = edev->phb;
if (NULL == phb ||
(eeh_has_flag(EEH_PROBE_MODE_DEVTREE) && 0 == phb->buid))
return;
eeh_ops->of_probe(dn, NULL);
eeh_ops->probe(pdn, NULL);
}
/**
* eeh_add_device_tree_early - Enable EEH for the indicated device
* @dn: device node
* @pdn: PCI device node
*
* This routine must be used to perform EEH initialization for the
* indicated PCI device that was added after system boot (e.g.
* hotplug, dlpar).
*/
void eeh_add_device_tree_early(struct device_node *dn)
void eeh_add_device_tree_early(struct pci_dn *pdn)
{
struct device_node *sib;
struct pci_dn *n;
for_each_child_of_node(dn, sib)
eeh_add_device_tree_early(sib);
eeh_add_device_early(dn);
if (!pdn)
return;
list_for_each_entry(n, &pdn->child_list, list)
eeh_add_device_tree_early(n);
eeh_add_device_early(pdn);
}
EXPORT_SYMBOL_GPL(eeh_add_device_tree_early);
@ -1144,13 +1130,6 @@ void eeh_add_device_late(struct pci_dev *dev)
edev->pdev = dev;
dev->dev.archdata.edev = edev;
/*
* We have to do the EEH probe here because the PCI device
* hasn't been created yet in the early stage.
*/
if (eeh_has_flag(EEH_PROBE_MODE_DEV))
eeh_ops->dev_probe(dev, NULL);
eeh_addr_cache_insert_dev(dev);
}