Re: [PATCH char-misc-next v3 2/8] misc: mic: add a bus driver for virtual MIC devices
From: Sudeep Dutt
Date: Sat Jul 12 2014 - 02:51:00 EST
On Fri, 2014-07-11 at 18:31 -0700, Greg Kroah-Hartman wrote:
> On Fri, Jul 11, 2014 at 06:27:20PM -0700, Greg Kroah-Hartman wrote:
> > On Fri, Jul 11, 2014 at 02:04:20PM -0700, Sudeep Dutt wrote:
> > > This MIC virtual bus driver takes the responsibility of creating all
> > > the virtual devices connected to the PCIe device on the host and the
> > > platform device on the card. The MIC bus hardware operations provide
> > > a way to abstract certain hardware details from the base physical devices.
> > > Examples of devices added on the MIC virtual bus include host DMA and card DMA.
> > > This abstraction enables using a common DMA driver on host and card.
> > >
> > > Reviewed-by: Ashutosh Dixit <ashutosh.dixit@xxxxxxxxx>
> > > Reviewed-by: Nikhil Rao <nikhil.rao@xxxxxxxxx>
> > > Signed-off-by: Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
> > > Signed-off-by: Siva Yerramreddy <yshivakrishna@xxxxxxxxx>
> > > ---
> > > drivers/misc/mic/Kconfig | 17 ++++
> > > drivers/misc/mic/Makefile | 1 +
> > > drivers/misc/mic/bus/Makefile | 5 +
> > > drivers/misc/mic/bus/mic_bus.c | 218 +++++++++++++++++++++++++++++++++++++++++
> > > include/linux/mic_bus.h | 110 +++++++++++++++++++++
> > > 5 files changed, 351 insertions(+)
> > > 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
> > Looks good, but no addition to scripts/mod/file2alias.c to allow
> > autoloading of mic_bus drivers?
> > I'll take patches 1 and 2 here, as I need some acks from the DMA people
> > on patch 3.
> And I took 4-8 as well, as they seemed independant from patch 3.
Thanks for accepting the patches Greg. The good news is that the 7
patches accepted build fine without patch 3 and the drivers load
The bad news is that the MIC Coprocessors no longer boot without patch 3
since the host driver does not find any DMA channels. Reverting patch 5
titled "add dma support in host driver" with SHA d4ef098 allows the
Coprocessors to boot again but accepting patch 3 instead is the cleanest
solution here. Dan, please review patch 3 as we would really like it to
get accepted before the 3.17 merge window opens.
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