[Bug 73083] Semi-repeatable SIGBUS in R600UploadToScreenCS's memcpy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73083

--- Comment #1 from Alex Deucher <agd5f at yahoo.com> ---
Created attachment 91242
  --> https://bugs.freedesktop.org/attachment.cgi?id=91242&action=edit
possible fix

Does this fix the issue?  The issue is that that buffer is larger than the pci
bar window into vram.  The patch forces a scratch copy for all uploads.  It
would also probably be good to fix the kernel to check the offset in
radeon_mode_dumb_mmap() if the domain is vram to see if it's larger than the
pci window and return an error if so.

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