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<p style="margin-top:0;margin-bottom:0">Right.  We ran into issues with reading back that register at runtime when UMDs queried it when other stuff was in flight, so we just read it once at startup and cache the results. Now when UMDs request it, we return
 the cached value.</p>
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<p style="margin-top:0;margin-bottom:0">Alex<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Koenig, Christian<br>
<b>Sent:</b> Wednesday, March 7, 2018 9:31:13 AM<br>
<b>To:</b> Mao, David; Liu, Monk<br>
<b>Cc:</b> Deucher, Alexander; amd-gfx@lists.freedesktop.org; Jin, Jian-Rong<br>
<b>Subject:</b> Re: deprecated register issues</font>
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<div class="x_moz-cite-prefix">Hi David,<br>
<br>
well I just figured that this is a misunderstanding.<br>
<br>
Accessing this register and some other deprecated registers can cause problem when invalidating VMHUBs.<br>
<br>
This register itself isn't deprecated, the wording in a patch fixing things is just a bit unclear.<br>
<br>
Question is is that register still accessed regularly or is it value cached after startup?
<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 07.03.2018 um 15:25 schrieb Mao, David:<br>
</div>
<blockquote type="cite">We requires base driver to provide the mask of disabled RB.
<div class="">This is why kernel read the CC_RB_BACKEND_DISABLE to collect the harvest configuration.</div>
<div class="">Where did you get to know that the register is deprecated?</div>
<div class="">I think it should still be there.</div>
<div class=""><br class="">
</div>
<div class="">Best Regards,</div>
<div class="">David<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Mar 7, 2018, at 9:49 PM, Liu, Monk <<a href="mailto:Monk.Liu@amd.com" class="">Monk.Liu@amd.com</a>> wrote:</div>
<br class="x_Apple-interchange-newline">
<div class="">
<div class="x_WordSection1" style="font-family:Helvetica; font-size:12px; font-style:normal; font-weight:normal; letter-spacing:normal; text-align:start; text-indent:0px; text-transform:none; white-space:normal; word-spacing:0px; background-color:rgb(255,255,255); text-decoration:none">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext">+ UMD guys</span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext">Hi David</span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext">Do you know if<span class="x_Apple-converted-space"> </span></span><b class=""><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:windowtext">GC_USER_RB_BACKEND_DISABLE
 is still exist for gfx9/vega10 ?</span></b></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><b class=""><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:windowtext"> </span></b></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><b class=""><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:windowtext">We found<span class="x_Apple-converted-space"> </span></span></b><span class="" lang="EN-US" style="color:windowtext">CC_RB_BACKEND_DISABLE
 was deprecated but looks it is still in use in kmd, so</span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US">I want to check with you both of above registers</span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US">Thanks<span class="x_Apple-converted-space"> </span></span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US">/Monk</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext"></span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-size:10.5pt; font-family:等线; color:windowtext"> </span></div>
<div class="">
<div class="" style="border-style:solid none none; border-top-width:1pt; border-top-color:rgb(225,225,225); padding:3pt 0cm 0cm">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><b class=""><span class="" lang="EN-US" style="font-size:11pt; font-family:Calibri,sans-serif; color:windowtext">From:</span></b><span class="" lang="EN-US" style="font-size:11pt; font-family:Calibri,sans-serif; color:windowtext"><span class="x_Apple-converted-space"> </span>amd-gfx
 [<a href="mailto:amd-gfx-bounces@lists.freedesktop.org" class="">mailto:amd-gfx-bounces@lists.freedesktop.org</a>]<span class="x_Apple-converted-space"> </span><b class="">On Behalf Of<span class="x_Apple-converted-space"> </span></b>Christian K?nig<br class="">
<b class="">Sent:</b><span class="x_Apple-converted-space"> </span>2018</span><span class="" style="font-size:11pt; color:windowtext">年</span><span class="" lang="EN-US" style="font-size:11pt; font-family:Calibri,sans-serif; color:windowtext">3</span><span class="" style="font-size:11pt; color:windowtext">月</span><span class="" lang="EN-US" style="font-size:11pt; font-family:Calibri,sans-serif; color:windowtext">7</span><span class="" style="font-size:11pt; color:windowtext">日</span><span class="" lang="EN-US" style="font-size:11pt; font-family:Calibri,sans-serif; color:windowtext"><span class="x_Apple-converted-space"> </span>20:26<br class="">
<b class="">To:</b><span class="x_Apple-converted-space"> </span>Liu, Monk <<a href="mailto:Monk.Liu@amd.com" class="">Monk.Liu@amd.com</a>>; Deucher, Alexander <<a href="mailto:Alexander.Deucher@amd.com" class="">Alexander.Deucher@amd.com</a>><br class="">
<b class="">Cc:</b><span class="x_Apple-converted-space"> </span><a href="mailto:amd-gfx@lists.freedesktop.org" class="">amd-gfx@lists.freedesktop.org</a><br class="">
<b class="">Subject:</b><span class="x_Apple-converted-space"> </span>Re: deprecated register issues</span></div>
</div>
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<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US">Hi Monk,<br class="">
<br class="">
I honestly don't have the slightest idea why we are still accessing CC_RB_BACKEND_DISABLE. Maybe it still contains some useful values?<br class="">
<br class="">
Key point was that we needed to stop accessing it all the time to avoid triggering problems.<br class="">
<br class="">
Regards,<br class="">
Christian.<br class="">
<br class="">
Am 07.03.2018 um 13:11 schrieb Liu, Monk:</span></div>
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<blockquote class="" style="margin-top:5pt; margin-bottom:5pt">
<div id="x_divtagdefaultwrapper" class="">
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">Hi Christian</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">I remember you and AlexD mentioned that a handful registers are deprecated for greenland (gfx9)</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">e.g. CC_RB_BACKEND_DISABLE</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">do you know why we still have this routine ?</span></p>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(86,156,214)">static</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"><span class="x_Apple-converted-space"> </span>u32</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(220,220,170)"></span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(220,220,170)">gfx_v9_0_get_rb_active_bitmap</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">(</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(86,156,214)">struct</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"><span class="x_Apple-converted-space"> </span>amdgpu_device
 *adev)</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">{</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    u32 data, mask;</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    data =<span class="x_Apple-converted-space"> </span></span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(220,220,170)">RREG32_SOC15</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">(GC,</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(181,206,168)"></span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(181,206,168)">0</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">, mmCC_RB_BACKEND_DISABLE);</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    data |=<span class="x_Apple-converted-space"> </span></span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(220,220,170)">RREG32_SOC15</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">(GC,</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(181,206,168)"></span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(181,206,168)">0</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">, mmGC_USER_RB_BACKEND_DISABLE);</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    data &= CC_RB_BACKEND_DISABLE__BACKEND_DISABLE_MASK;</span></div>
</div>
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    data >>= GC_USER_RB_BACKEND_DISABLE__BACKEND_DISABLE__SHIFT;</span></div>
</div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体; line-height:14.25pt; background-color:rgb(30,30,30)">
<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    mask =<span class="x_Apple-converted-space"> </span></span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(220,220,170)">amdgpu_gfx_create_bitmask</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">(adev-></span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(156,220,254)">gfx</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">.</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(156,220,254)">config</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">.</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(156,220,254)">max_backends_per_se</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"><span class="x_Apple-converted-space"> </span>/</span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">                     adev-></span><span class="" lang="EN-US" style="">gfx</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">.</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(156,220,254)">config</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">.</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(156,220,254)">max_sh_per_se</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">);</span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
<div class="">
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">    </span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(197,134,192)">return</span><span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"><span class="x_Apple-converted-space"> </span>(~data)
 & mask;</span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)">}</span></div>
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<span class="" lang="EN-US" style="font-size:10.5pt; font-family:"Courier New"; color:rgb(212,212,212)"> </span></div>
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<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></div>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">see that it still read CC_RB_BACKEND_DISABLE</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">thanks</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif">/Monk</span></p>
<p class=""><span class="" lang="EN-US" style="font-family:Calibri,sans-serif"> </span></p>
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<div class="" style="margin:0cm 0cm 0.0001pt; font-size:12pt; font-family:宋体"><span class="" lang="EN-US"> </span></div>
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