[PATCH char-misc-next 0/8] Enable dma driver for MIC X100 Coprocessors

[Sudeep Dutt]

These patches are being sent to char-misc because there is a dependency
between the patches for dma driver and other drivers.

Description:
============
This set of patches add support for MIC X100 dma driver.
MIC PCIe card has a dma controller with 8 channels. These channels are
shared between the host s/w and the card s/w. 0 to 3 are used by host
nd 4 to 7 by card. As the dma device doesn't show up as PCIe device,
a virtual bus called mic bus is created and virtual dma devices are
created on it by the host/card drivers. On host the channels are private
and used only by the host driver to transfer data for the virtio devices.

Here is a higher level block diagram.
                                      |
               +----------+           |             +----------+
               | Card OS  |           |             | Host OS  |
               +----------+           |             +----------+
                                      |
        +-------+ +--------+ +------+ | +---------+  +--------+ +--------+
        | Virtio| |Virtio  | |Virtio| | |Virtio   |  |Virtio  | |Virtio  |
        | Net   | |Console | |Block | | |Net      |  |Console | |Block   |
        | Driver| |Driver  | |Driver| | |backend  |  |backend | |backend |
        +-------+ +--------+ +------+ | +---------+  +--------+ +--------+
            |         |         |     |      |            |         |
            |         |         |     |User  |            |         |
            |         |         |     |------|------------|---------|-------
            +-------------------+     |Kernel +--------------------------+
                      |               |       | Virtio over PCIe IOCTLs  |
                      |               |       +--------------------------+
+-----------+         |               |                   |  +-----------+
| MIC DMA   |         |               |                   |  | MIC DMA   |
| Driver    |         |               |                   |  | Driver    |
+-----------+         |               |                   |  +-----------+
      |               |               |                   |        |
+---------------+     |               |                   |  +----------------+
|MIC virtual Bus|     |               |                   |  |MIC virtual Bus |
+---------------+     |               |                   |  +----------------+
      |               |               |                   |              |
      |   +--------------+            |            +---------------+     |
      |   |Intel MIC     |            |            |Intel MIC      |     |
      +---|Card Driver   |            |            |Host Driver    |     |
          +--------------+            |            +---------------+-----+
                      |               |                   |
             +-------------------------------------------------------------+
             |                                                             |
             |                    PCIe Bus                                 |
             +-------------------------------------------------------------+

The following series of patches are partitioned as follows:

Patch 1: Add mic bus and dma driver documentation.
	 Author: Siva Yerramreddy
Patch 2: Add a bus driver for virtual MIC devices.
	 Authors: Siva Yerramreddy, Sudeep Dutt
Patch 3: MIC X100 DMA Driver.
	 Author: Siva Yerramreddy
Patch 4: Add threaded irq support in host driver.
	 This is needed as the dma driver uses threaded irq.
	 Author: Siva Yerramreddy
Patch 5: Use dma to transfer data between MIC and host.
	 Authors: Siva Yerramreddy, Ashutosh Dixit
Patch 6: Add threaded irq support in mic_request_card_irq.
	 This is needed as the dma driver uses threaded irq.
	 Author: Siva Yerramreddy
Patch 7: Add dma device on mic bus.
	 Author: Siva Yerramreddy
Patch 8: Modify the mpss script to load/unload mic_x100_dma.ko.
	 Author: Siva Yerramreddy

The patches have been compiled/validated against v3.15-rc3. Tested using
dmatest module with module parameter "threads_per_chan=60". These patches
have also been scanned by Fengguang Wu's 0-day infrastructure and no
issues have been reported.

Thanks to Dan Williams, Vinod Koul, Jon Mason, Dave Jiang for the initial
review.

Siva Yerramreddy (8):
  misc: mic: Add mic bus and dma driver documentation
  misc: mic: add a bus driver for virtual MIC devices
  dma: MIC X100 DMA Driver
  misc: mic: add threaded irq support in host driver
  misc: mic: add dma support in host driver
  misc: mic: add threaded irq support in card driver
  misc: mic: add dma support in card driver
  misc: mic: add support for loading/unloading dma driver

 Documentation/mic/mic_overview.txt |  67 ++--
 Documentation/mic/mpssd/mpss       |  14 +-
 drivers/dma/Kconfig                |  19 +
 drivers/dma/Makefile               |   1 +
 drivers/dma/mic_x100_dma.c         | 774 +++++++++++++++++++++++++++++++++++++
 drivers/dma/mic_x100_dma.h         | 286 ++++++++++++++
 drivers/misc/mic/Kconfig           |  21 +-
 drivers/misc/mic/Makefile          |   1 +
 drivers/misc/mic/bus/Makefile      |   5 +
 drivers/misc/mic/bus/mic_bus.c     | 188 +++++++++
 drivers/misc/mic/card/mic_device.c |  21 +-
 drivers/misc/mic/card/mic_device.h |   8 +-
 drivers/misc/mic/card/mic_virtio.c |   4 +-
 drivers/misc/mic/card/mic_x100.c   |  52 ++-
 drivers/misc/mic/host/mic_boot.c   |  78 +++-
 drivers/misc/mic/host/mic_device.h |  24 ++
 drivers/misc/mic/host/mic_intr.c   | 116 +++---
 drivers/misc/mic/host/mic_intr.h   |  21 +-
 drivers/misc/mic/host/mic_main.c   |   5 +-
 drivers/misc/mic/host/mic_virtio.c | 185 +++++++--
 drivers/misc/mic/host/mic_virtio.h |  21 +-
 drivers/misc/mic/host/mic_x100.c   |   8 +
 include/linux/mic_bus.h            | 148 +++++++
 23 files changed, 1922 insertions(+), 145 deletions(-)
 create mode 100644 drivers/dma/mic_x100_dma.c
 create mode 100644 drivers/dma/mic_x100_dma.h
 create mode 100644 drivers/misc/mic/bus/Makefile
 create mode 100644 drivers/misc/mic/bus/mic_bus.c
 create mode 100644 include/linux/mic_bus.h

-- 
1.8.2.1

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