It's used by the UMD though they read from 0/*/* when reading the RASTER_CONFIG registers (which may be a bug...) I only added it because the previous interface was either */*/* or x/y/z (where none are *). Now it supports arbitrary bank selections. Tom ________________________________ From: Christian König <deathsimple@xxxxxxxxxxx> Sent: Tuesday, October 11, 2016 08:30 To: StDenis, Tom; Michel Dänzer Cc: amd-gfx at lists.freedesktop.org Subject: Re: [PATCH] drm/amd/amdgpu: Allow broadcast on debugfs read (v2) 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 <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx><mailto:amd-gfx-bounces at lists.freedesktop.org> on behalf of Michel Dänzer <michel.daenzer at mailbox.org><mailto:michel.daenzer at mailbox.org> Sent: Monday, October 10, 2016 23:52 To: Tom St Denis Cc: amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> 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 <tom.stdenis at amd.com><mailto:tom.stdenis at amd.com> 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 Graphics, Processors and Immersive VR Solutions | AMD <http://www.amd.com/> www.amd.com<http://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 amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> 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 amd-gfx at lists.freedesktop.org<mailto:amd-gfx at lists.freedesktop.org> https://lists.freedesktop.org/mailman/listinfo/amd-gfx -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20161011/6dea423d/attachment.html>
