linux-kernel - Re: [PATCH char-misc-next v3 3/8] dma: MIC X100 DMA Driver

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Date:	Mon, 14 Jul 2014 10:07:23 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Siva Yerramreddy <yshivakrishna@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Ashutosh Dixit <ashutosh.dixit@...el.com>,
	Nikhil Rao <nikhil.rao@...el.com>,
	Sudeep Dutt <sudeep.dutt@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: Re: [PATCH char-misc-next v3 3/8] dma: MIC X100 DMA Driver

On Fri, 2014-07-11 at 14:04 -0700, Sudeep Dutt wrote:
> From: Siva Yerramreddy <yshivakrishna@...il.com>
> 
> This patch implements DMA Engine API for DMA controller on MIC X100
> Coprocessors. DMA h/w is shared between host and card s/w.
> Channels 0 to 3 are used by host and 4 to 7 are used by card.
> Since the DMA device doesn't show up as PCIe device, a virtual bus called mic
> bus is created and virtual devices are added on that bus to follow device model.
> Allowed dma transfer directions are host to card, card to host and card to card.
> 
> Reviewed-by: Ashutosh Dixit <ashutosh.dixit@...el.com>
> Reviewed-by: Nikhil Rao <nikhil.rao@...el.com>
> Reviewed-by: Sudeep Dutt <sudeep.dutt@...el.com>
> Signed-off-by: Siva Yerramreddy <yshivakrishna@...il.com>
> ---
>  drivers/dma/Kconfig        |  19 ++
>  drivers/dma/Makefile       |   1 +
>  drivers/dma/mic_x100_dma.c | 774 +++++++++++++++++++++++++++++++++++++++++++++
>  drivers/dma/mic_x100_dma.h | 286 +++++++++++++++++
>  4 files changed, 1080 insertions(+)
>  create mode 100644 drivers/dma/mic_x100_dma.c
>  create mode 100644 drivers/dma/mic_x100_dma.h

This patch was first included in linux-next in next-20140714.

> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 1eca7b9..7c8b8c4 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -33,6 +33,25 @@ if DMADEVICES
>  
>  comment "DMA Devices"
>  
> +config INTEL_MIC_X100_DMA
> +	tristate "Intel MIC X100 DMA Driver"
> +	depends on 64BIT && X86 && INTEL_MIC_BUS
> +	select DMAENGINE

You probably meant
         select DMA_ENGINE

> +	default N

That should have been "default n". As (lowercase) "n" is the default
anyhow, that line might as well be dropped.

> +	help
> +	  This enables DMA support for the Intel Many Integrated Core
> +	  (MIC) family of PCIe form factor coprocessor X100 devices that
> +	  run a 64 bit Linux OS. This driver will be used by both MIC
> +	  host and card drivers.
> +
> +	  If you are building host kernel with a MIC device or a card
> +	  kernel for a MIC device, then say M (recommended) or Y, else
> +	  say N. If unsure say N.
> +
> +	  More information about the Intel MIC family as well as the Linux
> +	  OS and tools for MIC to use with this driver are available from
> +	  <http://software.intel.com/en-us/mic-developer>.
> +
>  config INTEL_MID_DMAC
>  	tristate "Intel MID DMA support for Peripheral DMA controllers"
>  	depends on PCI && X86

Should I submit the trivial, but untested, patch to fix this or do you
prefer to do that yourself?


Paul Bolle

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