[Mesa-dev] llvmpipe support for ARM?

[Jan Vesely]

Hi,
I can run arm llvmpipe glxgears on IFC6410 (Snapdragon 600 APQ8064,
Krait 300) without problems.
llvm 3.5
mesa 10.4.3
both are fedora 21 standard packages without modifications.
I haven't tried anything more complex than glxgears

jan

On Wed, 2015-04-15 at 16:30 +0200, Roland Scheidegger wrote:
> There were reports with varying success of running llvmpipe with arm in
> the past but I haven't heard anything for a while. In theory it should
> work (and crashing in the pixel shader is an indication the vertex
> shader worked or at least didn't crash).
> But it's not really tested and hence might easily break. My suggestion
> would be to try a newer Mesa version since 9.2.5 is very old, but I
> really don't know if it will help.
> If that doesn't help, you could try debugging it, you can get the
> crashing instruction in gdb with x/i <address> and see if that was an
> unaligned access which should have been aligned or something else.
> GALLIVM_DEBUG=ir,asm will get you the IR and compiled code (with debug
> builds).
> 
> Roland
> 
> 
> Am 15.04.2015 um 14:37 schrieb Marko Moberg:
> > Hi,
> > 
> > I have been trying to get OpenGL sw rastering to work on Linux based ARM
> > CortexA15 device but for some reason gallium llvmpipe gives me a
> > segmentation fault. Has anybody managed to run sw rastering using
> > gallium llvmpipe on ARM? Softpipe seems to be working ok.
> > 
> > I am using the following versions:
> > - Mesa 9.2.5
> > - LLVM3.3
> > - Wayland/Weston 1.5
> > 
> > The issue is related to opengl/gles2 rendering i.e. weston-simple-egl
> > demo and Qt openGL demos give seg faults when executed with llvmpipe
> > enabled. 
> > 
> > Backtrace from weston-simple-egl looks something like this:
> > #0  0x6d7de620 in ?? ()
> > #1  0xb354004c in fs17_variant0_partial ()
> > #2  0xb6841740 in lp_rast_shade_quads_mask (task=task at entry=0x1e360,
> >     inputs=inputs at entry=0x47a00, x=128, y=80, mask=4369) at lp_rast.c:466
> > #3  0xb6842d04 in do_block_4_1 (c=<optimized out>, y=<optimized out>,
> >     x=<optimized out>, plane=<optimized out>, tri=<optimized out>,
> >     task=<optimized out>) at lp_rast_tri_tmp.h:61
> > #4  do_block_16_1 (c=<synthetic pointer>, y=<optimized out>,
> >     x=<optimized out>, plane=0xb4f4ccf0, tri=<optimized out>,
> >     task=<optimized out>) at lp_rast_tri_tmp.h:130
> > #5  lp_rast_triangle_1 (task=0x1e360, arg=...) at lp_rast_tri_tmp.h:232
> > #6  0xb6840420 in do_rasterize_bin (bin=<optimized out>, task=0x1e360,
> >     x=<optimized out>, y=<optimized out>) at lp_rast.c:607
> > #7  rasterize_bin (y=<optimized out>, x=<optimized out>, bin=<optimized
> > out>,
> >     task=0x1e360) at lp_rast.c:626
> > #8  rasterize_scene (task=task at entry=0x1e360, scene=0xb3646008)
> >     at lp_rast.c:675
> > #9  0xb6840cb0 in thread_function (init_data=0x1e360) at lp_rast.c:788
> > #10 0xb6d98ed2 in start_thread () from /lib/libpthread.so.0
> > #11 0xb6c91058 in ?? () from /lib/libc.so.6
> > #12 0xb6c91058 in ?? () from /lib/libc.so.6
> > 
> > regards,
> > Marko
> > 
> > marko.s.moberg at gmail.com <mailto:marko.s.moberg at gmail.com>
> > 
> > 
> > 
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> > 
> 
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-- 
Jan Vesely <jan.vesely at rutgers.edu>
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