linux-kernel - Re: IOAT 4.0 driver not supported on Intel 5000 chipset

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Date:   Wed, 25 Jan 2017 09:41:25 -0700
From:   Dave Jiang <dave.jiang@...el.com>
To:     Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
Cc:     "Koul, Vinod" <vinod.koul@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: IOAT 4.0 driver not supported on Intel 5000 chipset



On 01/24/2017 10:46 PM, Anshuman Khandual wrote:
> Hello Vinod/Dave,
> 
> I have an old X86 system with 'Intel(R) Xeon(R) CPU X5450' which has
> '5000 Series Chipset'. The latest mainline IOAT driver does not work
> on it. Dont see /sys/class/dma getting filled up with channel details
> even if I manually load both dca.ko followed by ioatdma.ko drivers
> after the system boots. As it was working on a old distro kernel like
> 3.10, did a git bisect to figure out that the support was removed for
> older IOAT HW around August 2015 with the following commits.
> 
> commit 85596a19478da5125f3471a0c474b3f05a78e390
> Author: Dave Jiang <dave.jiang@...el.com>
> Date:   Tue Aug 11 08:48:10 2015 -0700
> 
>     dmaengine: ioatdma: remove ioat1 specific code
>     
>     Cleaning up of ioat1 specific code as it is no longer supported
>     
>     Signed-off-by: Dave Jiang <dave.jiang@...el.com>
>     Acked-by: Dan Williams <dan.j.williams@...el.com>
>     Signed-off-by: Vinod Koul <vinod.koul@...el.com>
> 
> d73f277b329f46c13527c1090808421828671596 is the first bad commit
> commit d73f277b329f46c13527c1090808421828671596
> Author: Dave Jiang <dave.jiang@...el.com>
> Date:   Tue Aug 11 08:48:04 2015 -0700
> 
>     dmaengine: ioatdma: deprecating and removal of old ioatdma devices
>     
>     Removal of any devices that are ioatdma pre-3.0. This is the first step
>     in attempting to clean up the ioatdma driver and remove hw no longer
>     supported.
>     
>     Signed-off-by: Dave Jiang <dave.jiang@...el.com>
>     Acked-by: Dan Williams <dan.j.williams@...el.com>
>     Signed-off-by: Vinod Koul <vinod.koul@...el.com>
> 
> I intend to use the HW with mainline kernel. Is there any work around
> which can make it happen ?

If the IOATDMA engine is 2.0, you can try adding the device ID in and
see if that still works. It should theoretically. If it's 1.0, then you
are pretty much out of luck.

> 
> Regards
> Anshuman
> 
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