I briefly remember reading in some hardware doc that this actually has a
defined behavior.
It was something about applying either bit wise "and" or "or" on the
resulting bits and returning that to the reader.
This way you can check with a single broadcast read if an error occurred
or if any of the instances are busy.
But if you don't actually use it I suggest to not implement this.
Regards,
Christian.
Am 11.10.2016 um 12:26 schrieb StDenis, Tom:
That actually makes sense. It came up because mmPA_SC_RASTER_CONFIG
(and _1) are read by libdrm with a selection of 0/*/* for
se/sh/instance so I wanted to be able to reproduce that via the
debugfs interface for testing.
But ya, if you use the broadcast bit who are you reading from then ...
hmm..
Tom
------------------------------------------------------------------------
*From:* amd-gfx <[email protected]> on behalf of
Michel Dänzer <[email protected]>
*Sent:* Monday, October 10, 2016 23:52
*To:* Tom St Denis
*Cc:* [email protected]
*Subject:* Re: [PATCH] drm/amd/amdgpu: Allow broadcast on debugfs read
(v2)
On 09/10/16 08:58 PM, Tom St Denis wrote:
> Allow any of the se/sh/instance fields to be
> specified as a broadcast by submitting 0x3FF.
>
> (v2) Fix broadcast range checking
>
> Signed-off-by: Tom St Denis <[email protected]>
I'm not sure how a "broadcast read" is supposed to work? I can only see
the register specs talking about broadcast in connection with writes.
--
Earthling Michel Dänzer | http://www.amd.com
<http://www.amd.com>
Graphics, Processors and Immersive VR Solutions | AMD
<http://www.amd.com/>
www.amd.com
Explore a wide range of innovative next generation computing
processors, graphics, and Immersive VR solutions by Advanced Micro
Devices (AMD). Visit AMD.com now!
Libre software enthusiast | Mesa and X developer
_______________________________________________
amd-gfx mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
amd-gfx Info Page - lists.freedesktop.org
<https://lists.freedesktop.org/mailman/listinfo/amd-gfx>
lists.freedesktop.org
To see the collection of prior postings to the list, visit the amd-gfx
Archives. Using amd-gfx: To post a message to all the list members,
send email ...
_______________________________________________
amd-gfx mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
amd-gfx mailing list
[email protected]
https://lists.freedesktop.org/mailman/listinfo/amd-gfx
