The patchset was built based on patchset powerpc/powernv: Simplify EEH
implementation, which can be found from:
https://patchwork.ozlabs.org/patch/439956/
The patchset corresponds to skiboot changes, which manages PCI slots
in a unified way: OPAL APIs used to do slot reset, power management,
presence status retrival. The patchset shouldn't be merged before
the OPAL firmware counterpart is merged:
https://patchwork.ozlabs.org/patch/440463/
The kernel changes have been split into 2 parts:
(A) Use the unified PCI slot reset OPAL API, PATCH[1] and PATCH[2]
(B) powernv-php driver to support PCI hotplug for PowerNV platform, starting
from PATCH[3]. The device tree is scanned when the driver is loaded. If
any PCI device node is equipped with property ibm,slot-pluggable and
ibm,reset-by-firmware, it's regarded as hotpluggable slot and the driver
creates/registers slot for it. After that, the sysfs entries can be used
to operate the slot.
PATCH[3/4/5/6]: Necessary code changes to PPC PCI subsystem in order to
support PCI slots for PPC PowerNV platform.
PATCH[7] : powernv-php driver to support PCI hotplug for PowerNV
platform.
Hotplug testing
===
# cat /proc/cpuinfo | grep -i powernv
platform: PowerNV
machine : PowerNV 8286-41A
# pwd
/sys/bus/pci/slots
# ls
C10 C11 C12 C14 C15 C6 C7 C8 C9
# lspci -s 0003::.
0003:00:00.0 PCI bridge: IBM Device 03dc
0003:01:00.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:01.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:08.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:09.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:10.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:11.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:03:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI
Host Controller (rev 02)
0003:09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.2 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.3 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:0f:00.0 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3]
# pwd
/sys/bus/pci/slots/C10
# cat address
0003:09:00
# cat cur_bus_speed
5.0 GT/s PCIe
# cat max_bus_speed
8.0 GT/s PCIe
# cat power
1
# echo 0 power
# lspci -s 0003::.
0003:00:00.0 PCI bridge: IBM Device 03dc
0003:01:00.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:01.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:08.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:09.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:10.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:11.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:03:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI
Host Controller (rev 02)
0003:0f:00.0 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3]
# echo 1 power
# lspci -s 0003::.
0003:00:00.0 PCI bridge: IBM Device 03dc
0003:01:00.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:01.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:08.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:09.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:10.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:02:11.0 PCI bridge: PLX Technology, Inc. Device 8748 (rev ca)
0003:03:00.0 USB controller: Texas Instruments TUSB73x0 SuperSpeed USB 3.0 xHCI
Host Controller (rev 02)
0003:09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.1 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.2 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:09:00.3 Ethernet controller: Broadcom Corporation NetXtreme BCM5719
Gigabit Ethernet PCIe (rev 01)
0003:0f:00.0 Network controller: Mellanox Technologies MT27500 Family
[ConnectX-3]
Changelog
=
v1 - v2
* Keep opal_pci_reinit(). In case the slot is resetted by kernel,
instead of skiboot, this API should be called to restore states
for those affected devices.
* Reworked slot ID scheme so that old/new kernel can work with
skiboot with or without unified PCI slot management support.
* Code cleanup here and there.
* Separate powernv-php driver to support PCI hotplug for
PowerNV platform.
* Check if the OPAL API supported by firmware before calling
into it, which is necessary for back-compability.
* Separate patch for factoring
