[Mesa-dev] [Bug 110408] Lima cannot handle too many vertices because of limited pre-allocated buffer

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110408

            Bug ID: 110408
           Summary: Lima cannot handle too many vertices because of
                    limited pre-allocated buffer
           Product: Mesa
           Version: git
          Hardware: ARM
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: icenowylin at gmail.com
        QA Contact: mesa-dev at lists.freedesktop.org

When I try to run the bump:bump-render=high-poly test of glmark2-es2-drm on
Lima, it crashes with a segfault.

The backtrace shows:
                #0  0x0000ffffb3ab03e0 lima_ctx_buff_va (sun4i-drm_dri.so)
                #1  0x0000ffffb3ab43b4 lima_update_varying (sun4i-drm_dri.so)
                #2  0x0000ffffb3619304 u_vbuf_draw_vbo (sun4i-drm_dri.so)
                #3  0x0000ffffb37b15e4 st_draw_vbo (sun4i-drm_dri.so)
                #4  0x0000ffffb3852938 _mesa_draw_arrays (sun4i-drm_dri.so)
                #5  0x0000aaaade1d3954 _ZN4Mesh10render_vboEv (glmark2-es2-drm)
                #6  0x0000aaaade16dce4 _ZN9SceneBump4drawEv (glmark2-es2-drm)
                #7  0x0000aaaade156d10 _ZN8MainLoop4drawEv (glmark2-es2-drm)
                #8  0x0000aaaade157540 _ZN8MainLoop4stepEv (glmark2-es2-drm)
                #9  0x0000aaaade14aca0 _Z12do_benchmarkR6Canvas
(glmark2-es2-drm)
                #10 0x0000aaaade148948 main (glmark2-es2-drm)
                #11 0x0000ffffb400c638 __libc_start_main (libc.so.6)
                #12 0x0000aaaade14aaf0 $x (glmark2-es2-drm)
                #13 0x0000aaaade14aaf0 $x (glmark2-es2-drm)

>From inspection, lima_ctx_buff_va seems to be refering to a context buffer that
haven't been successfully allocated, and in lima_update_varying() the
allocation failure seems to be because the requested memory size is too big
(because the vertex count is big, 144000 for bump:bump-render=high-poly).

Should we use some better way than u_suballocator to allocate the memory for
the varying storage?

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