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<p class="MsoNormal">I have been working on integrating image support into a hybrid Clover build.<o:p></o:p></p>
<p class="MsoNormal">I managed to get 2D image reads working a week or so ago, and have moved on to implementing 2D image writes.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have an issue where when writing 4x4 images, things are working fine. When I move on to larger images, I get stalls of the CS from libDRM.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">From what I can tell, when I try to write images larger than 4x4, the code starts using a fetch shader to move the image.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am assuming that there is some sort of conflict between running a compute shader and a fetch shader at the same time, but I’m not sure what I need to do to get them to cooperate with each other.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">With image reads, I initially had a problem with I tried reading images larger than 4x4, due to the use of a pixel shader, where I’d get CS stalls from libDRM.<o:p></o:p></p>
<p class="MsoNormal">Although it may not have been the right way to fix it, I managed to get this working, by adding a EVENT_TYPE_PS_PARTIAL_FLUSH, in evergreen_compute.c’s evergreen_init_atom_start_compute_cs(), after the EVENT_TYPE_CS_PARTIAL_FLUSH.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have been trying to figure out if there is something similar that I can do with the fetch shader, but have not had any luck quite yet.<o:p></o:p></p>
<p class="MsoNormal">Maybe I’m off the mark, and just need to reconfigure the fetch shader to emit with the RADEON_CP_PACKET3_COMPUTE_MODE flag set?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have myself rather confused at the moment...<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt">Al Dorrington<o:p></o:p></span></b></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt">Software Engineer Sr<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt">Lockheed Martin, Mission Systems and Training<o:p></o:p></span></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
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