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anv: Emit a dummy MEDIA_VFE_STATE before switching from GPGPU to 3D

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There is an object-level  preemption workaround which requires this.
However, even without object-level preemption, we seem to have issues
with geometry flickering when 3D and compute are combined in the same
batch and this appears to fix it.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=109630
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111267
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Jason Ekstrand
2019-07-31 10:42:24 -05:00
parent 5544b2cbbd
commit bc612536eb
1 changed files with 19 additions and 0 deletions
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19
src/intel/vulkan/genX_cmd_buffer.c
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@@ -3827,6 +3827,25 @@ genX(flush_pipeline_select)(struct anv_cmd_buffer *cmd_buffer,
anv_batch_emit(&cmd_buffer->batch, GENX(3DSTATE_CC_STATE_POINTERS), t);
#endif
#if GEN_GEN == 9
if (pipeline == _3D) {
/* There is a mid-object preemption workaround which requires you to
* re-emit MEDIA_VFE_STATE after switching from GPGPU to 3D. However,
* even without preemption, we have issues with geometry flickering when
* GPGPU and 3D are back-to-back and this seems to fix it. We don't
* really know why.
*/
const uint32_t subslices =
MAX2(cmd_buffer->device->instance->physicalDevice.subslice_total, 1);
anv_batch_emit(&cmd_buffer->batch, GENX(MEDIA_VFE_STATE), vfe) {
vfe.MaximumNumberofThreads =
devinfo->max_cs_threads * subslices - 1;
vfe.NumberofURBEntries = 2;
vfe.URBEntryAllocationSize = 2;
}
}
#endif
/* From "BXML » GT » MI » vol1a GPU Overview » [Instruction]
* PIPELINE_SELECT [DevBWR+]":
*