[PATCH v7 00/50] powerpc/powernv: PCI hotplug support

Gavin Shan
2015-11-04T13:13:51Z

This series of patches rebases on powerpc/next branch, plus below additional
patches:

https://patchwork.ozlabs.org/patch/534804/ (PATCH[1/1] Andrew's EEH fix)
https://patchwork.ozlabs.org/patch/534154/ (PATCH[7/7] Richard's SRIOV Rework)
commit 3b0e21e Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next

The series of patches intend to support PCI slot for PowerPC PowerNV platform,
which is running on top of skiboot firmware. The patchset requires corresponding
changes from skiboot firmware, which is sent to skiboot@lists.ozlabs.org
for review. The PCI slots are exposed by skiboot with device node properties,
and kernel utilizes those properties to populated PCI slots accordingly.

The original PCI infrastructure on PowerNV platform can't support hotplug
because the PE is assigned during PHB fixup time, which is called for once
during system boot time. For this, the PCI infrastructure on PowerNV platform
has been reworked for a lot. After that, the PE and its corresponding resources
(IODT, M32DT, M64 segments, DMA32 and bypass window) are assigned upon updating
PCI bridge's resources, which might decide PE# assigned to the PE (e.g. M64
resources, on P8 strictly speaking). Each PE will maintain a reference count,
which is (number of child PCI devices + 1). That indicates when last child PCI
device leaves the PE, the PE and its included resources will be relased and put
back into free pool again. With this design, the PE will be released when EEH PE
is released. PATCH[1 - 27] are related to this part.

>From skiboot perspective, PCI slot is providing (hot/fundamental/complete)
resets to EEH. The kernel gets to know if skiboot supports various reset on one
particular PCI slot through device-tree node. If it does, EEH will utilize the
functionality provided by skiboot. Besides, the device-tree nodes have to change
in order to support PCI hotplug. For example, when one PCI adapter inserted to
one slot, its device-tree node should be added to the system dynamically. Conversely,
the device-tree node should be removed from the system when the PCI adapter is going
to be offline. Since pci_dn and eeh_dev have same life cyle as PCI device nodes,
they should be added/removed accordingly during PCI hotplug. PATCH[28 - 43] are
doing the related work.

The OF driver is changed to support unflattening FDT blob for sub-stree, which
is covered by PATCH[44 - 49].

The last one, PATCH[50], is the standalone PCI hotplug driver for PowerPC PowerNV
platform.

Changelog
=========
v7:
* Reworked revision to some extent.
* Rebased to powerpc/next repository.
* Reorder/split/merge/drop according - Alexey.
* Defined macros and use array to track IO/M32/M64/DMA32 segments - Alexey.
* Merged 3 files to one for the hotplug driver - Alexey.
* As part of OPAL API, defined macros for PCI slot power state, hotplug
message type. Defined macros for PCI slot power confirmed state in
hotplug driver.
* Misc comments from Alexey.
* Reworked unflatten_dt_node() to avoid recursive function calls.
* Use EXPORT_SYMBOL_GPL() and document function's input/output - Rob/Frank.
v6:
* Patch reorder, split, squash - Alexey.
* Minor coding style - Alexey.
* Better function names for pcibios_{add,remove}_pci_devices - Bjorn
* Replace pr_warn() with dev_warn() in PowerNV hotplug driver - Bjorn
* Concurrent depth as parameter passed to __unflatten_dt_node() - Grant / Alexey
* Replace overlay with of_changeset - Grant
v5:
* Rebased to 4.1.rc6 and some unmerged patches as below:
Alexey's DDW patchset (v11);
Gavin's EEH error injection support (in mpe's next branch);
Richard's EEH cleanup patches (in mpe's next branch);
Richard's EEH support for VF (v7);
Gavin's misc EEH fixes for 4.2;
* The revision bases on skiboot corresponding patches (v7):
https://patchwork.ozlabs.org/patch/480437/
* Utilize OF overlay to update device-tree with help of newly introduced
OPAL API opal_get_overlay_dt().
* Split patches for easy review according to aik's comments.
* Fix coding style from checkpatchc.pl as pointed by aik.
* Code cleanup and misc fixup according to aik's input.
v4:
* Rebased to 4.1.RC1
* Added API to unflatten FDT blob to device node sub-tree, which is attached
the indicated parent device node. The original mechanism based on formatted
string stream has been dropped.
* The PATCH[v3 09/21] ("powerpc/eeh: Delay probing EEH device during hotplug")
was picked up sent to linux-ppc@ separately for review as Richard's "VF EEH
Support" depends on that.
v3:
* Rebased to 4.1.RC0
* PowerNV PCI infrasturcture is total refactored in order to support PCI
hotplug. The PowerNV hotplug driver is also reworked a lot because of
the changes in skiboot in order to support PCI hotplug.

Gavin Shan (50):
PCI: Add pcibios_setup_bridge()
powerpc/pci: Override pcibios_setup_bridge()
powerpc/pci: Cleanup on struct pci_controller_ops
powerpc/powernv: Cleanup on pnv_pci_ioda_controller_ops
powerpc/powernv: Drop pnv_ioda_setup_dev_PE()
powerpc/powernv: Drop phb->bdfn_to_pe()
powerpc/powernv: Reorder fields in struct pnv_phb
powerpc/powernv: Rename PE# fields in struct pnv_phb
powerpc/powernv: Fix initial IO and M32 segmap
powerpc/powernv: Simplify pnv_ioda_setup_pe_seg()
powerpc/powernv: IO and M32 mapping based on PCI device resources
powerpc/powernv: Track M64 segment consumption
powerpc/powernv: Rename M64 related functions
powerpc/powernv: M64 support on P7IOC
powerpc/powernv: Rename pnv_pci_ioda_setup_dma_pe()
powerpc/powernv: Define PNV_IODA1_DMA32_SEGSIZE
powerpc/powernv: Avoid calculating DMA32 segments on PHB3
powerpc/powernv: Remove DMA32 PE list
powerpc/powernv: Track DMA32 segment consumption
powerpc/powernv: Improve DMA32 segment calculation
powerpc/powernv: Increase PE# capacity
powerpc/powernv: Introduce pnv_ioda_init_pe()
powerpc/powernv: Use PE instead of number during setup and release
powerpc/powernv: Allocate PE# in reverse order
powerpc/powernv: Reserve PE for root bus
powerpc/powernv: Create PEs at PCI hot plugging time
powerpc/powernv: Dynamically release PEs
powerpc/pci: Rename pcibios_{add,remove}_pci_devices()
powerpc/pci: Rename pcibios_find_pci_bus()
powerpc/pci: Move pci_find_bus_by_node() around
powerpc/pci: Export pci_add_device_node_info()
powerpc/pci: Introduce pci_remove_device_node_info()
powerpc/pci: Export pci_traverse_device_nodes()
powerpc/pci: Delay populating pdn
powerpc/pci: Don't scan empty slot
powerpc/pci: Update bridge windows on PCI plug
powerpc/powernv: Simplify pnv_eeh_reset()
powerpc/powernv: Exclude root bus in pnv_pci_reset_secondary_bus()
powerpc/powernv: Fundamental reset in pnv_pci_reset_secondary_bus()
powerpc/powernv: Support PCI slot ID
powerpc/powernv: Use firmware PCI slot reset infrastructure
powerpc/powernv: Functions to get/set PCI slot status
powerpc/powernv: Select OF_DYNAMIC
drivers/of: Split unflatten_dt_node()
drivers/of: Avoid recursively calling unflatten_dt_node()
drivers/of: Rename unflatten_dt_node()
drivers/of: Specify parent node in of_fdt_unflatten_tree()
drivers/of: Return allocated memory from of_fdt_unflatten_tree()
drivers/of: Export OF changeset functions
PCI/hotplug: PowerPC PowerNV PCI hotplug driver

MAINTAINERS | 6 +
arch/powerpc/include/asm/eeh.h | 2 +-
arch/powerpc/include/asm/opal-api.h | 17 +-
arch/powerpc/include/asm/opal.h | 8 +-
arch/powerpc/include/asm/pci-bridge.h | 25 +-
arch/powerpc/include/asm/pnv-pci.h | 7 +
arch/powerpc/include/asm/ppc-pci.h | 8 +-
arch/powerpc/kernel/eeh_dev.c | 19 +-
arch/powerpc/kernel/eeh_driver.c | 12 +-
arch/powerpc/kernel/pci-common.c | 16 +-
arch/powerpc/kernel/pci-hotplug.c | 47 +-
arch/powerpc/kernel/pci_dn.c | 85 +-
arch/powerpc/platforms/maple/pci.c | 34 +-
arch/powerpc/platforms/pasemi/pci.c | 3 -
arch/powerpc/platforms/powermac/pci.c | 38 +-
arch/powerpc/platforms/powernv/Kconfig | 1 +
arch/powerpc/platforms/powernv/eeh-powernv.c | 173 ++--
arch/powerpc/platforms/powernv/opal-wrappers.S | 4 +
arch/powerpc/platforms/powernv/pci-ioda.c | 1251 +++++++++++++++---------
arch/powerpc/platforms/powernv/pci.c | 92 +-
arch/powerpc/platforms/powernv/pci.h | 62 +-
arch/powerpc/platforms/pseries/msi.c | 4 +-
arch/powerpc/platforms/pseries/pci_dlpar.c | 32 -
arch/powerpc/platforms/pseries/setup.c | 8 +-
drivers/of/dynamic.c | 65 +-
drivers/of/fdt.c | 378 ++++---
drivers/of/of_private.h | 2 +
drivers/of/overlay.c | 8 +-
drivers/of/unittest.c | 6 +-
drivers/pci/hotplug/Kconfig | 12 +
drivers/pci/hotplug/Makefile | 3 +
drivers/pci/hotplug/pnv_php.c | 866 ++++++++++++++++
drivers/pci/hotplug/rpadlpar_core.c | 8 +-
drivers/pci/hotplug/rpaphp_core.c | 4 +-
drivers/pci/hotplug/rpaphp_pci.c | 4 +-
drivers/pci/setup-bus.c | 5 +
include/linux/of_fdt.h | 5 +-
include/linux/pci.h | 1 +
38 files changed, 2389 insertions(+), 932 deletions(-)
create mode 100644 drivers/pci/hotplug/pnv_php.c

--
2.1.0