linux-kernel - Re: [PATCH RESEND v3 3/7] Intel MIC Host Driver, card OS state management.

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Message-ID: <1378492863.107744.69.camel@localhost>
Date:	Fri, 06 Sep 2013 11:41:03 -0700
From:	Sudeep Dutt <sudeep.dutt@...el.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rob Landley <rob@...dley.net>, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-doc@...r.kernel.org, Asias He <asias@...hat.com>,
	Nikhil Rao <nikhil.rao@...el.com>,
	Ashutosh Dixit <ashutosh.dixit@...el.com>,
	Caz Yokoyama <Caz.Yokoyama@...el.com>,
	Dasaratharaman Chandramouli 
	<dasaratharaman.chandramouli@...el.com>,
	Harshavardhan R Kharche <harshavardhan.r.kharche@...el.com>,
	"Yaozu (Eddie) Dong" <eddie.dong@...el.com>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>,
	Sudeep Dutt <sudeep.dutt@...el.com>
Subject: Re: [PATCH RESEND v3 3/7] Intel MIC Host Driver, card OS state
 management.

On Thu, 2013-09-05 at 22:01 -0700, Greg Kroah-Hartman wrote:
> On Thu, Sep 05, 2013 at 04:41:55PM -0700, Sudeep Dutt wrote:
> > +What:		/sys/class/mic/mic(x)/firmware
> > +Date:		August 2013
> > +KernelVersion:	3.11
> > +Contact:	Sudeep Dutt <sudeep.dutt@...el.com>
> > +Description:
> > +		When read, this sysfs entry provides the path name under
> > +		/lib/firmware/ where the firmware image to be booted on the
> > +		card can be found. The entry can be written to change the
> > +		firmware image location under /lib/firmware/.
> 
> I don't understand, is the path under the HOST device, or the Client
> device's disk?  Why do you need to change the path on the HOST?  What's
> wrong with the existing firmware path selection we have in the kernel?
> 

The path is on the host. The card does not have a physical persistent
disk device. Our customers like the flexibility of changing the card
firmware/ramdisk contents and file names for individual MIC cards. This
flexibility is not possible with a static set of firmware file names in
the kernel for all cards.

Once the firmware/ramdisk path under /lib/firmware/ is set up via sysfs,
card boot is initiated via the "state" sysfs entry. The host driver then
obtains the contents of the firmware and ramdisk via the standard
request_firmware(..) interface, copies the contents to card memory and
interrupts the card BIOS to initiate boot.

Thanks,
Sudeep Dutt


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