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

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

On Thu, Nov 05, 2015 at 12:12:00AM +1100, Gavin Shan wrote:
>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
>

As asked by Alexey, here is the repo on github:

https://github.com/gwshan/pnv-pci-hotplug.git

>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
>