Re: [GIT PULL] PCI: Support for configurable PCI endpoint

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On Wed, Apr 05, 2017 at 02:22:20PM +0530, Kishon Vijay Abraham I wrote:
> Hi Bjorn,
> 
> Please find the pull request for PCI endpoint support below. I've
> also included all the history here.

Thanks, I applied these (with v7 of the first patch) to pci/host-designware
for v4.12.

> Changes from v5:
> *) remove #syscon-cells property added in v5 and used 
>    of_parse_phandle_with_fixed_args
> *) fix compilation error in make.cross ARCH=blackfin that was because
>    pci_endpoint_test.c driver depends on COMPILE_TEST.
> 
> Changes from v4:
> *) add #syscon-cells property and used of_parse_phandle_with_args
>    to perform a configuration in syscon module (as suggested by
>    Rob Herring)
> *) Remove unnecessary white space.
> 
> Changes from v3:
> *) fixed a typo and adapted to https://lkml.org/lkml/2017/3/13/562.
> 
> Changes from v2:
> *) changed the configfs structure as suggested by Christoph Hellwig. With
>    this change the framework creates configfs entry for EP function driver
>    and EP controller. Previously these entries have to be created by the
>    the user. (Haven't changed the epc core or epf core except for invoking
>    configfs APIs to create entries for EP function driver and EP controller.
>    That's mostly because the EP function device can still be created by
>    directly invoking the epf core API without using configfs).
> *) Now the user has to use configfs entry 'start' to start the link.
>    This was previously done by the function driver. However in the case of
>    multi function EP, the function driver shouldn't start the link.
> 
> Changes from v1:
> *) The preparation patches for adding EP support is removed and is sent
>    separately
> *) Added device ID for DRA74x/DRA72x and used it instead of
>    using "PCI_ANY_ID"
> *) Added userguide for PCI endpoint test function
> 
> Major Improvements from RFC:
>  *) support multi-function devices (hw supported not virtual)
>  *) Access host side buffers
>  *) Raise MSI interrupts
>  *) Add user space program to use the host side PCI driver
>  *) Adapt all other users of designware to use the new design (only
>     compile tested. Since I have only dra7xx boards, the new design
>     has only been tested in dra7xx. I'd require the help of others
>     to test the platforms they have access to).
> 
> This is based on
> git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git
> pci/host-designware
> 
> Thanks
> Kishon
> 
> The following changes since commit 7ea64dcf602c21b3e5062ca90111ca4459fab403:
> 
>   __end__ (2017-04-04 15:29:37 -0500)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/kishon/pci-endpoint.git tags/pci-endpoint-for-4.12
> 
> for you to fetch changes up to a5c85ba45c9682456077d7277196e91f8ea5fd5c:
> 
>   ARM: DRA7: clockdomain: Change the CLKTRCTRL of CM_PCIE_CLKSTCTRL to SW_WKUP (2017-04-05 14:05:28 +0530)
> 
> ----------------------------------------------------------------
> pci: endpoint: for 4.12
> 
>  *) Add PCI endpoint core layer
>  *) Modify designware and dra7xx driver to be configured in EP mode
>  *) Add a PCI endpoint *test* function driver and corresponding host
>     driver
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> 
> ----------------------------------------------------------------
> Kishon Vijay Abraham I (23):
>       PCI: endpoint: Add EP core layer to enable EP controller and EP functions
>       Documentation: PCI: Guide to use PCI Endpoint Core Layer
>       PCI: endpoint: Introduce configfs entry for configuring EP functions
>       Documentation: PCI: Guide to use PCI endpoint configfs
>       PCI: endpoint: Create configfs entry for EPC device and EPF driver
>       Documentation: PCI: Add specification for the *PCI test* function device
>       PCI: endpoint: functions: Add an EP function to test PCI
>       Documentation: PCI: Add binding documentation for pci-test endpoint function
>       PCI: dwc: designware: Add EP mode support
>       dt-bindings: PCI: Add DT bindings for PCI designware EP mode
>       PCI: dwc: dra7xx: Facilitate wrapper and MSI interrupts to be enabled independently
>       PCI: dwc: dra7xx: Add EP mode support
>       dt-bindings: PCI: dra7xx: Add DT bindings for PCI dra7xx EP mode
>       PCI: dwc: dra7xx: Workaround for errata id i870
>       dt-bindings: PCI: dra7xx: Add DT bindings to enable unaligned access
>       PCI: Add device IDs for DRA74x and DRA72x
>       misc: Add host side PCI driver for PCI test function device
>       Documentation: misc-devices: Add Documentation for pci-endpoint-test driver
>       tools: PCI: Add a userspace tool to test PCI endpoint
>       tools: PCI: Add sample test script to invoke pcitest
>       Documentation: PCI: Add userguide for PCI endpoint test function
>       MAINTAINERS: Add PCI Endpoint maintainer
>       ARM: DRA7: clockdomain: Change the CLKTRCTRL of CM_PCIE_CLKSTCTRL to SW_WKUP
> 
>  Documentation/PCI/00-INDEX                                |  10 +++
>  Documentation/PCI/endpoint/function/binding/pci-test.txt  |  17 +++++
>  Documentation/PCI/endpoint/pci-endpoint-cfs.txt           | 105 ++++++++++++++++++++++++++
>  Documentation/PCI/endpoint/pci-endpoint.txt               | 215 ++++++++++++++++++++++++++++++++++++++++++++++++++++
>  Documentation/PCI/endpoint/pci-test-function.txt          |  66 ++++++++++++++++
>  Documentation/PCI/endpoint/pci-test-howto.txt             | 179 +++++++++++++++++++++++++++++++++++++++++++
>  Documentation/devicetree/bindings/pci/designware-pcie.txt |  26 +++++--
>  Documentation/devicetree/bindings/pci/ti-pci.txt          |  42 +++++++++--
>  Documentation/misc-devices/pci-endpoint-test.txt          |  35 +++++++++
>  MAINTAINERS                                               |   9 +++
>  arch/arm/mach-omap2/clockdomains7xx_data.c                |   2 +-
>  drivers/Makefile                                          |   2 +
>  drivers/misc/Kconfig                                      |   7 ++
>  drivers/misc/Makefile                                     |   1 +
>  drivers/misc/pci_endpoint_test.c                          | 534 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/Kconfig                                       |   1 +
>  drivers/pci/dwc/Kconfig                                   |  36 ++++++++-
>  drivers/pci/dwc/Makefile                                  |   5 +-
>  drivers/pci/dwc/pci-dra7xx.c                              | 270 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
>  drivers/pci/dwc/pcie-designware-ep.c                      | 342 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/dwc/pcie-designware.c                         | 125 ++++++++++++++++++++++++++++++
>  drivers/pci/dwc/pcie-designware.h                         | 112 +++++++++++++++++++++++++++
>  drivers/pci/endpoint/Kconfig                              |  31 ++++++++
>  drivers/pci/endpoint/Makefile                             |   7 ++
>  drivers/pci/endpoint/functions/Kconfig                    |  12 +++
>  drivers/pci/endpoint/functions/Makefile                   |   5 ++
>  drivers/pci/endpoint/functions/pci-epf-test.c             | 510 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/endpoint/pci-ep-cfs.c                         | 509 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/endpoint/pci-epc-core.c                       | 579 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/pci/endpoint/pci-epc-mem.c                        | 143 +++++++++++++++++++++++++++++++++++
>  drivers/pci/endpoint/pci-epf-core.c                       | 351 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mod_devicetable.h                           |  10 +++
>  include/linux/pci-ep-cfs.h                                |  41 ++++++++++
>  include/linux/pci-epc.h                                   | 144 +++++++++++++++++++++++++++++++++++
>  include/linux/pci-epf.h                                   | 162 +++++++++++++++++++++++++++++++++++++++
>  include/linux/pci_ids.h                                   |   2 +
>  include/uapi/linux/Kbuild                                 |   1 +
>  include/uapi/linux/pcitest.h                              |  19 +++++
>  tools/pci/pcitest.c                                       | 186 +++++++++++++++++++++++++++++++++++++++++++++
>  tools/pci/pcitest.sh                                      |  56 ++++++++++++++
>  40 files changed, 4869 insertions(+), 40 deletions(-)
>  create mode 100644 Documentation/PCI/endpoint/function/binding/pci-test.txt
>  create mode 100644 Documentation/PCI/endpoint/pci-endpoint-cfs.txt
>  create mode 100644 Documentation/PCI/endpoint/pci-endpoint.txt
>  create mode 100644 Documentation/PCI/endpoint/pci-test-function.txt
>  create mode 100644 Documentation/PCI/endpoint/pci-test-howto.txt
>  create mode 100644 Documentation/misc-devices/pci-endpoint-test.txt
>  create mode 100644 drivers/misc/pci_endpoint_test.c
>  create mode 100644 drivers/pci/dwc/pcie-designware-ep.c
>  create mode 100644 drivers/pci/endpoint/Kconfig
>  create mode 100644 drivers/pci/endpoint/Makefile
>  create mode 100644 drivers/pci/endpoint/functions/Kconfig
>  create mode 100644 drivers/pci/endpoint/functions/Makefile
>  create mode 100644 drivers/pci/endpoint/functions/pci-epf-test.c
>  create mode 100644 drivers/pci/endpoint/pci-ep-cfs.c
>  create mode 100644 drivers/pci/endpoint/pci-epc-core.c
>  create mode 100644 drivers/pci/endpoint/pci-epc-mem.c
>  create mode 100644 drivers/pci/endpoint/pci-epf-core.c
>  create mode 100644 include/linux/pci-ep-cfs.h
>  create mode 100644 include/linux/pci-epc.h
>  create mode 100644 include/linux/pci-epf.h
>  create mode 100644 include/uapi/linux/pcitest.h
>  create mode 100644 tools/pci/pcitest.c
>  create mode 100644 tools/pci/pcitest.sh
> 
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