Hi David, well I just figured that this is a misunderstanding. Accessing this register and some other deprecated registers can cause problem when invalidating VMHUBs. This register itself isn't deprecated, the wording in a patch fixing things is just a bit unclear. Question is is that register still accessed regularly or is it value cached after startup? Regards, Christian. Am 07.03.2018 um 15:25 schrieb Mao, David: > We requires base driver to provide the mask of disabled RB. > This is why kernel read the CC_RB_BACKEND_DISABLE to collect the > harvest configuration. > Where did you get to know that the register is deprecated? > I think it should still be there. > > Best Regards, > David > >> On Mar 7, 2018, at 9:49 PM, Liu, Monk <Monk.Liu at amd.com >> <mailto:Monk.Liu at amd.com>> wrote: >> >> + UMD guys >> Hi David >> Do you know if*GC_USER_RB_BACKEND_DISABLE is still exist for >> gfx9/vega10 ?* >> ** >> *We found*CC_RB_BACKEND_DISABLE was deprecated but looks it is still >> in use in kmd, so >> I want to check with you both of above registers >> Thanks >> /Monk >> *From:*amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org]*On >> Behalf Of*Christian K?nig >> *Sent:*2018å¹´3æ??7æ?¥20:26 >> *To:*Liu, Monk <Monk.Liu at amd.com <mailto:Monk.Liu at amd.com>>; Deucher, >> Alexander <Alexander.Deucher at amd.com <mailto:Alexander.Deucher at amd.com>> >> *Cc:*amd-gfx at lists.freedesktop.org <mailto:amd-gfx at lists.freedesktop.org> >> *Subject:*Re: deprecated register issues >> Hi Monk, >> >> I honestly don't have the slightest idea why we are still accessing >> CC_RB_BACKEND_DISABLE. Maybe it still contains some useful values? >> >> Key point was that we needed to stop accessing it all the time to >> avoid triggering problems. >> >> Regards, >> Christian. >> >> Am 07.03.2018 um 13:11 schrieb Liu, Monk: >> >> Hi Christian >> >> I remember you and AlexD mentioned that a handful registers are >> deprecated for greenland (gfx9) >> >> e.g. CC_RB_BACKEND_DISABLE >> >> do you know why we still have this routine ? >> >> staticu32 >> gfx_v9_0_get_rb_active_bitmap(structamdgpu_device *adev) >> { >>     u32 data, mask; >>     data =RREG32_SOC15(GC, >> 0, mmCC_RB_BACKEND_DISABLE); >>     data |=RREG32_SOC15(GC, >> 0, mmGC_USER_RB_BACKEND_DISABLE); >>     data &= CC_RB_BACKEND_DISABLE__BACKEND_DISABLE_MASK; >>     data >>= GC_USER_RB_BACKEND_DISABLE__BACKEND_DISABLE__SHIFT; >>     mask >> =amdgpu_gfx_create_bitmask(adev->gfx.config.max_backends_per_se/ >> adev->gfx.config.max_sh_per_se); >> return(~data) & mask; >> } >> >> see that it still read CC_RB_BACKEND_DISABLE >> >> thanks >> >> /Monk >> > -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20180307/8a0b41d6/attachment-0001.html>
