Re: [PATCH char-misc-next v2 0/8] Enable dma driver for MIC X100 Coprocessors

From: Sudeep Dutt
Date: Mon Jun 30 2014 - 11:41:16 EST

On Mon, 2014-06-16 at 08:58 -0700, Sudeep Dutt wrote:
> On Thu, 2014-05-29 at 14:23 -0700, Sudeep Dutt wrote:
> > ChangeLog:
> > =========
> > v1 => v2:
> > a) MIC bus driver cleanups and device release callback fix in patch 2,
> > as per feedback from Greg Kroah-Hartman.
> >
> > v1: Initial post @ https://lkml.org/lkml/2014/5/27/819
> >
>
> Hi Greg/Dan,
>
> We have addressed the feedback received so far. Please take a look at
> this patch series.
>

Another gentle reminder to take a look at this patch series. Greg/Dan,
please let us know what we can do to speed things up here.

Thanks,
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 (7):
> > misc: mic: Add mic bus and dma driver documentation
> > 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
> >
> > Sudeep Dutt (1):
> > misc: mic: add a bus driver for virtual MIC devices
> >
> > 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 | 219 +++++++++++
> > drivers/misc/mic/card/mic_device.c | 23 +-
> > drivers/misc/mic/card/mic_device.h | 9 +-
> > drivers/misc/mic/card/mic_virtio.c | 7 +-
> > drivers/misc/mic/card/mic_x100.c | 55 ++-
> > drivers/misc/mic/host/mic_boot.c | 83 +++-
> > drivers/misc/mic/host/mic_device.h | 24 ++
> > drivers/misc/mic/host/mic_intr.c | 121 +++---
> > drivers/misc/mic/host/mic_intr.h | 27 +-
> > drivers/misc/mic/host/mic_main.c | 5 +-
> > drivers/misc/mic/host/mic_virtio.c | 187 +++++++--
> > drivers/misc/mic/host/mic_virtio.h | 21 +-
> > drivers/misc/mic/host/mic_x100.c | 8 +
> > include/linux/mic_bus.h | 112 ++++++
> > 23 files changed, 1938 insertions(+), 151 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
> >
>
>


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