[PATCH 0/1] Fix Navi cards crashing with FP exception on 5.6+

From: Daniel Kolesa <daniel@octaforge.org>
To: amd-gfx@lists.freedesktop.org
Cc: Daniel Kolesa <daniel@octaforge.org>
Subject: [PATCH 0/1] Fix Navi cards crashing with FP exception on 5.6+
Date: Wed, 29 Apr 2020 17:02:35 +0200	[thread overview]
Message-ID: <20200429150236.4626-1-daniel@octaforge.org> (raw)

This is not a real fix, but rather a workaround that should be applied to the
5.6 tree and newer. The idea here is to work around the compiler emitting FP
instructions outside the DC_FP_START/DC_FP_END blocks, which it currently does,
which causes crashes at least on ppc64le.

A proper solution would be to move all the floating point code into its own
files, then compile those with hard-float and strictly wrap all calls into
those with the DC_FP_START/DC_FP_END blocks, with the rest of the code being
compiled without floating point, but that's too extensive of a change to do,
and would not be possible in a stable tree.

The proper solution is already being discussed, it seems:

https://lore.kernel.org/lkml/CAG48ez2Sx4ELkM94aD_h_J7K7KBOeuGmvZLKRkg3n_f2WoZ_cg@mail.gmail.com/

Daniel Kolesa (1):
  drm/amd/display: work around fp code being emitted outside of
    DC_FP_START/END

 .../drm/amd/display/dc/dcn20/dcn20_resource.c | 31 ++++++++++++++-----
 1 file changed, 23 insertions(+), 8 deletions(-)

-- 
2.26.2

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