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[1/5] and PATCH[2/5] allows to freeze PEs to avoid unexpected EEH error
reporting in PCI surprise hot remove path. PATCH[3/5] 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[4/5] removes likely() and unlikely() in pnv_php.c
as they are not too useful. PATCH[5/5] supports PCI surprise hotplug for PowerNV
PCI hotplug driver.
Changelog
=========
v2:
* Add one patch to remove likely() and unlikely() in pnv_php.c.
* Remove likely() and unlikely() in PATCH[v1 4/4].
* The event isn't pre-allocated. It's always allocated from slab
in the interrupt handler. The removed PE is put into frozen state
before the event is allocated.
Gavin Shan (5):
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: Remove likely() and unlikely() in powernv driver
drivers/pci/hotplug: Support surprise hotplug in powernv driver
arch/powerpc/include/asm/pnv-pci.h | 2 +
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 | 268 ++++++++++++++++++++++++++----
5 files changed, 256 insertions(+), 28 deletions(-)
--
2.1.0
