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powerpc/eeh: Trace PCI bus from PE 

There're several types of PEs can be supported for now: PHB, Bus
and Device dependent PE. For PCI bus dependent PE, tracing the
corresponding PCI bus from PE (struct eeh_pe) would make the code
more efficient. The patch also enables the retrieval of PCI bus based
on the PCI bus dependent PE.

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2013-06-20 13:20:55 +08:00 committed by Benjamin Herrenschmidt
parent 0156680854
commit 8cdb283371
2 changed files with 18 additions and 0 deletions
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1
arch/powerpc/include/asm/eeh.h
View File

@ -59,6 +59,7 @@ struct eeh_pe {
int config_addr; /* Traditional PCI address */
int addr; /* PE configuration address */
struct pci_controller *phb; /* Associated PHB */
struct pci_bus *bus; /* Top PCI bus for bus PE */
int check_count; /* Times of ignored error */
int freeze_count; /* Times of froze up */
int false_positives; /* Times of reported #ff's */

17
arch/powerpc/kernel/eeh_pe.c
View File

@ -364,6 +364,17 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
pe->addr = edev->pe_config_addr;
pe->config_addr = edev->config_addr;
/*
* While doing PE reset, we probably hot-reset the
* upstream bridge. However, the PCI devices including
* the associated EEH devices might be removed when EEH
* core is doing recovery. So that won't safe to retrieve
* the bridge through downstream EEH device. We have to
* trace the parent PCI bus, then the upstream bridge.
*/
if (eeh_probe_mode_dev())
pe->bus = eeh_dev_to_pci_dev(edev)->bus;
/*
* Put the new EEH PE into hierarchy tree. If the parent
* can't be found, the newly created PE will be attached
@ -641,12 +652,18 @@ struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe)
bus = pe->phb->bus;
} else if (pe->type & EEH_PE_BUS ||
pe->type & EEH_PE_DEVICE) {
if (pe->bus) {
bus = pe->bus;
goto out;
}
edev = list_first_entry(&pe->edevs, struct eeh_dev, list);
pdev = eeh_dev_to_pci_dev(edev);
if (pdev)
bus = pdev->bus;
}
out:
eeh_unlock();
return bus;