[Bug 83500] New: si_dma_copy_tile causes GPU hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83500

          Priority: medium
            Bug ID: 83500
          Assignee: dri-devel at lists.freedesktop.org
           Summary: si_dma_copy_tile causes GPU hangs
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: greg at chown.ath.cx
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Created attachment 105745
  --> https://bugs.freedesktop.org/attachment.cgi?id=105745&action=edit
Workaround

Async DMA linear to tiled copies are causing GPU hangs in some cases. On Cape
Verde, I can easily triggers this as described in [1]. The game Brutal Legend
also triggers similar hangs when it streams assets while gameplay.

Disabling usage of this function and using the resource_copy_region fallback
instead fixes all hangs. The attached patch does that.

[1] https://bugs.freedesktop.org/show_bug.cgi?id=79980#c124

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