This series of patches supports PCI surprise hotplug on PowerNV platform.
Without the corresponding skiboot patches, this feature won't be enabled
and workable.
* The skiboot patches can be found in below link (PATCH[01/16):
https://patchwork.ozlabs.org/project/skiboot/list/?submitter=63923
* This newly added functionality depends on skiboot's changes. However,
the functionality is disabled simply when skiboot doesn't support it.
For one specific slot, property "ibm,slot-surprise-pluggable" of the
slot's device node is set to 1 when surprise hotplug is claimed by
skiboot.
* The interrupts because of presence and link state change are enabled
in order to support PCI surprise hotplug. The surprise hotplug events
are queued to the PCI slot and they're picked up for further processing
in serialized fashion. The surprise and managed hotplug share same code
flow except: the affected PEs are put into frozen state to avoid unexpected
EEH error reporting in surprise hot remove path.
PATCH[1/4] and PATCH[2/4] allows to freeze PEs to avoid unexpected EEH error
reporting in PCI surprise hot remove path. PATCH[3/4] clears PE's frozen state
on initializing it because the PE might have been put into frozen state in last
PCI surprise hot remove. PATCH[4/4] supports PCI surprise hotplug in the PowerNV
PCI hotplug driver.
Gavin Shan (4):
powerpc/eeh: Allow to freeze PE in eeh_pe_set_option()
powerpc/eeh: Export eeh_pe_state_mark()
powerpc/powernv: Unfreeze PE on allocation
drivers/pci/hotplug: Support surprise hotplug
arch/powerpc/include/asm/pnv-pci.h | 9 ++
arch/powerpc/kernel/eeh.c | 1 +
arch/powerpc/kernel/eeh_pe.c | 1 +
arch/powerpc/platforms/powernv/pci-ioda.c | 12 ++
drivers/pci/hotplug/pnv_php.c | 219 ++++++++++++++++++++++++++++++
5 files changed, 242 insertions(+)
--
2.1.0
