Re: [PATCH] Let AHCI dirver skip Lenovo SWRAID controller

Hi Alan,

Thanks for your comments!

Lenovo SWRAID driver is a closed source driver at this time, I am afraid 
it's not possible to submit it to kernel.

This patch is very important and critical for Lenovo next generation 
Servers. I have tried to make sure this patch only impacts Lenovo 
dedicated hardware and add a on/off boot option to end user who may 
still wants using open source SWRAID(such as MDRAID).

I am a newbie to submit patch to kernel, so I am not so clear about what
my patch breaks. Could you kindly explain that and is there a workaround 
or solution to avoid the break?

Thanks a lot!

Ocean.

On 01/25/2016 09:18 PM, One Thousand Gnomes wrote:

On Mon, 25 Jan 2016 03:11:40 +0000
Ocean HY1 He [off-list ref] wrote:

quoted

Lenovo SWRAID solution is based on Intel Non-RSTE RAID controller which
is called Lenovo SWRAID controller by set Lenovo dedicated PCI
SVID:SDID.

Because AHCI driver now take control this Lenovo SWRAID controller for
MDRAID, Lenovo SWRAID driver fails to load later. It's not proper to
disable AHCI driver, because system has SATA contoller used for SATA
DVD, M.2 etc. There is no chance to load Lenovo SWRAID first, because
almost all Linux distros load AHCI driver first during installation.

As default, when Lenovo SWRAID controller is detected, let AHCI driver
skip it thus MDRAID is disabled. Use the boot option 'ahci.lenovo_swraid=0'
could disable Lenovo SWRAID.

You need to submit the Lenovo SWRAID driver to the kernel first.
Otherwise this breaks things.

Alan