[Intel-gfx] [RFCv3 11/15] drm/i915: Introduce execlist context status change notification

[Wang, Zhi A]

Hi Chirs:
     Could you elaborate your idea here? :) As we have to know the status change of the LRC context, not only the request to copy the content back to guest (There will be a small window between a request is finished and the context is switched out). We tried i915_wait_request() before, looks not help... And it seems only CSB change will show the context is really idle. 

-----Original Message-----
From: Chris Wilson [mailto:chris at chris-wilson.co.uk] 
Sent: Friday, March 11, 2016 7:28 PM
To: Wang, Zhi A
Cc: intel-gfx at lists.freedesktop.org; igvt-g at lists.01.org; Tian, Kevin; Lv, Zhiyuan; Niu, Bing; Song, Jike; daniel.vetter at ffwll.ch; Cowperthwaite, David J; joonas.lahtinen at linux.intel.com
Subject: Re: [RFCv3 11/15] drm/i915: Introduce execlist context status change notification

On Fri, Mar 11, 2016 at 06:59:42PM +0800, Zhi Wang wrote:
> This patch introduces an approach to track the execlist context status
> change.
> 
> GVT-g uses GVT context as the "shadow context". The content inside GVT
> context will be copied back to guest after the context is idle. So GVT-g
> has to know the status of the execlist context.
> 
> This function is configurable in the context creation service. Currently,
> Only GVT-g will create the "status-change-notification" enabled GEM
> context.

Nope. Please hook into the lower-frequency idle mechanism then.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre