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drivers/pci/hotplug: Support surprise hotplug in powernv driver

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This supports PCI surprise hotplug. The design is highlighted as
below:

   * The PCI slot's surprise hotplug capability is exposed through
     device node property "ibm,slot-surprise-pluggable", meaning
     PCI surprise hotplug will be disabled if skiboot doesn't support
     it yet.
   * The interrupt because of presence or link state change is raised
     on surprise hotplug event. One event is allocated and queued to
     the PCI slot for workqueue to pick it up and process in serialized
     fashion. The code flow for surprise hotplug is same to that for
     managed hotplug except: the affected PEs are put into frozen state
     to avoid unexpected EEH error reporting in surprise hot remove path.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan
2016-09-28 14:34:58 +10:00
committed by Michael Ellerman
parent 149ba66a90
commit 360aebd85a
2 changed files with 216 additions and 0 deletions
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2
arch/powerpc/include/asm/pnv-pci.h
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@@ -60,6 +60,8 @@ struct pnv_php_slot {
#define PNV_PHP_STATE_POPULATED 2
#define PNV_PHP_STATE_OFFLINE 3
int state;
int irq;
struct workqueue_struct *wq;
struct device_node *dn;
struct pci_dev *pdev;
struct pci_bus *bus;