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powerpc/eeh: powerpc/eeh: Support error recovery for VF PE

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PFs are enumerated on PCI bus, while VFs are created by PF's driver.

In EEH recovery, it has two cases:
1. Device and driver is EEH aware, error handlers are called.
2. Device and driver is not EEH aware, un-plug the device and plug it again
by enumerating it.

The special thing happens on the second case. For a PF, we could use the
original pci core to enumerate the bus, while for VF we need to record the
VFs which aer un-plugged then plug it again.

Also The patch caches the VF index in pci_dn, which can be used to
calculate VF's bus, device and function number. Those information helps to
locate the VF's PCI device instance when doing hotplug during EEH recovery
if necessary.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Wei Yang
2016-03-04 10:53:11 +11:00
committed by Michael Ellerman
parent 0dc2830e0a
commit 67086e32b5
6 changed files with 127 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/kernel/pci_dn.c
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@ -139,6 +139,7 @@ struct pci_dn *pci_get_pdn(struct pci_dev *pdev)
#ifdef CONFIG_PCI_IOV
static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
struct pci_dev *pdev,
int vf_index,
int busno, int devfn)
{
struct pci_dn *pdn;
@ -158,6 +159,7 @@ static struct pci_dn *add_one_dev_pci_data(struct pci_dn *parent,
pdn->busno = busno;
pdn->devfn = devfn;
#ifdef CONFIG_PPC_POWERNV
pdn->vf_index = vf_index;
pdn->pe_number = IODA_INVALID_PE;
#endif
INIT_LIST_HEAD(&pdn->child_list);
@ -197,7 +199,7 @@ struct pci_dn *add_dev_pci_data(struct pci_dev *pdev)
return NULL;
for (i = 0; i < pci_sriov_get_totalvfs(pdev); i++) {
pdn = add_one_dev_pci_data(parent, NULL,
pdn = add_one_dev_pci_data(parent, NULL, i,
pci_iov_virtfn_bus(pdev, i),
pci_iov_virtfn_devfn(pdev, i));
if (!pdn) {