[Skiboot] [PATCH 0/6] Add Nvlink support

[Gavin Shan]

On Mon, Oct 26, 2015 at 02:21:24PM +1100, Stewart Smith wrote:
>Alistair Popple <alistair at popple.id.au> writes:
>> NV-Link is a high speed interconnect that is used in conjunction with
>> a PCI-E connection to create an interface between CPU and GPU that
>> provides very high data bandwidth. A PCI-E connection to a GPU is used
>> as the control path to initiate and report status of large data
>> transfers sent via the NV-Link.
>>
>> On IBM Power systems the NV-Link hardware is similar to our standard
>> PCI IODA2/PHB3. To maximise code reuse skiboot exposes each NV-Link as
>> a PCIe device by emulating the standard PCIe configuration space in
>> software. Only the GPU can initiate data transfers.
>>
>> This patch series adds support for exposing the NPU as a set of PCIe
>> devices and a new PHB type. It provides functions for setting up the
>> IODA2 tables for data transfers and address translation in addition to
>> link training procedures which are called by drivers running on the
>> host.
>>
>> At this stage EEH is not supported beyond printing a console message.
>>
>> Alistair Popple (4):
>>   include/bitutils.h: Add macros for 16-bit constants
>>   include/pci-cfg.h: Add PCI vendor specific capability definitions
>>   Nvlink: Add NPU PHB functions
>>   Garrison: Add Nvlink device tree bindings
>>
>> Gavin Shan (2):
>>   PCI: Cache PCI device IDs
>>   PCI: Trace device node from PCI device
>>
>>  core/init.c                 |    3 +
>>  core/pci.c                  |   12 +-
>>  hw/Makefile.inc             |    2 +-
>>  hw/npu-hw-procedures.c      |  598 +++++++++++++++
>>  hw/npu.c                    | 1718 +++++++++++++++++++++++++++++++++++++++++++
>>  include/bitutils.h          |    3 +
>>  include/npu-regs.h          |  235 ++++++
>>  include/npu.h               |  211 ++++++
>>  include/pci-cfg.h           |   13 +
>>  include/pci.h               |   14 +-
>>  include/skiboot.h           |    2 +-
>>  platforms/astbmc/garrison.c |   61 ++
>>  12 files changed, 2866 insertions(+), 6 deletions(-)
>>  create mode 100644 hw/npu-hw-procedures.c
>>  create mode 100644 hw/npu.c
>>  create mode 100644 include/npu-regs.h
>>  create mode 100644 include/npu.h
>
>Thanks, merged as of 5a76659 Garrison: Add Nvlink device tree bindings
>
>
>What'd be great is if the device tree bindings were documented
>somewhere, say in doc/device-tree/ at least?
>

Yeah, Alistair or I will amend it later.

Thanks,
Gavin

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