Mesa (master): gallium: add PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT
Marek Olšák
mareko at kemper.freedesktop.org
Tue Oct 20 16:28:51 UTC 2015
Module: Mesa
Branch: master
Commit: 814f31457e9ae83d4f1e39236f704721b279b73d
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=814f31457e9ae83d4f1e39236f704721b279b73d
Author: Marek Olšák <marek.olsak at amd.com>
Date: Tue Oct 20 18:26:02 2015 +0200
gallium: add PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT
This avoids a serious r600g bug leading to a GPU hang.
The chances this bug will get fixed are pretty low now.
I deeply regret listening to others and not pushing this patch, leaving
other users with a GPU-crashing driver. Yes, it should be fixed
in the compiler and it's ugly, but users couldn't care less about that.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86720
Cc: 11.0 10.6 <mesa-stable at lists.freedesktop.org>
Reviewed-by: Brian Paul <brianp at vmware.com>
---
src/gallium/auxiliary/gallivm/lp_bld_limits.h | 2 ++
src/gallium/auxiliary/tgsi/tgsi_exec.h | 2 ++
src/gallium/docs/source/screen.rst | 4 ++++
src/gallium/drivers/freedreno/freedreno_screen.c | 2 ++
src/gallium/drivers/i915/i915_screen.c | 2 ++
src/gallium/drivers/ilo/ilo_screen.c | 2 ++
src/gallium/drivers/nouveau/nv30/nv30_screen.c | 4 ++++
src/gallium/drivers/nouveau/nv50/nv50_screen.c | 2 ++
src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 2 ++
src/gallium/drivers/r300/r300_screen.c | 4 ++++
src/gallium/drivers/r600/r600_pipe.c | 6 ++++++
src/gallium/drivers/radeonsi/si_pipe.c | 2 ++
src/gallium/drivers/svga/svga_screen.c | 4 ++++
src/gallium/drivers/vc4/vc4_screen.c | 2 ++
src/gallium/include/pipe/p_defines.h | 3 ++-
src/mesa/state_tracker/st_extensions.c | 3 +++
16 files changed, 45 insertions(+), 1 deletion(-)
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_limits.h b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
index 571c615..ad64ae0 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_limits.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_limits.h
@@ -137,6 +137,8 @@ gallivm_get_shader_param(enum pipe_shader_cap param)
case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
/* if we get here, we missed a shader cap above (and should have seen
* a compiler warning.)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.h b/src/gallium/auxiliary/tgsi/tgsi_exec.h
index a371aa9..f86adce 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.h
@@ -474,6 +474,8 @@ tgsi_exec_get_shader_param(enum pipe_shader_cap param)
case PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
/* if we get here, we missed a shader cap above (and should have seen
* a compiler warning.)
diff --git a/src/gallium/docs/source/screen.rst b/src/gallium/docs/source/screen.rst
index 72f7596..151afb2 100644
--- a/src/gallium/docs/source/screen.rst
+++ b/src/gallium/docs/source/screen.rst
@@ -367,6 +367,10 @@ to be 0.
are supported.
* ``PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE``: Whether the driver doesn't
ignore tgsi_declaration_range::Last for shader inputs and outputs.
+* ``PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT``: This is the maximum number
+ of iterations that loops are allowed to have to be unrolled. It is only
+ a hint to state trackers. Whether any loops will be unrolled is not
+ guaranteed.
.. _pipe_compute_cap:
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index f85e458..50d140f 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -412,6 +412,8 @@ fd_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
return 16;
case PIPE_SHADER_CAP_PREFERRED_IR:
return PIPE_SHADER_IR_TGSI;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
debug_printf("unknown shader param %d\n", param);
return 0;
diff --git a/src/gallium/drivers/i915/i915_screen.c b/src/gallium/drivers/i915/i915_screen.c
index c91408d..5812af6 100644
--- a/src/gallium/drivers/i915/i915_screen.c
+++ b/src/gallium/drivers/i915/i915_screen.c
@@ -167,6 +167,8 @@ i915_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_sha
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
debug_printf("%s: Unknown cap %u.\n", __FUNCTION__, cap);
return 0;
diff --git a/src/gallium/drivers/ilo/ilo_screen.c b/src/gallium/drivers/ilo/ilo_screen.c
index acf688f..e1a7dc5 100644
--- a/src/gallium/drivers/ilo/ilo_screen.c
+++ b/src/gallium/drivers/ilo/ilo_screen.c
@@ -138,6 +138,8 @@ ilo_get_shader_param(struct pipe_screen *screen, unsigned shader,
return PIPE_SHADER_IR_TGSI;
case PIPE_SHADER_CAP_TGSI_SQRT_SUPPORTED:
return 1;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
return 0;
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index d4cf143..0330164 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -264,6 +264,8 @@ nv30_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
debug_printf("unknown vertex shader param %d\n", param);
return 0;
@@ -305,6 +307,8 @@ nv30_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
debug_printf("unknown fragment shader param %d\n", param);
return 0;
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index a4431f2..ec51d00 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -300,6 +300,8 @@ nv50_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
NOUVEAU_ERR("unknown PIPE_SHADER_CAP %d\n", param);
return 0;
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index d34c8a2..af8e5f7 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -313,6 +313,8 @@ nvc0_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
return 16; /* would be 32 in linked (OpenGL-style) mode */
case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
return 16; /* XXX not sure if more are really safe */
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
NOUVEAU_ERR("unknown PIPE_SHADER_CAP %d\n", param);
return 0;
diff --git a/src/gallium/drivers/r300/r300_screen.c b/src/gallium/drivers/r300/r300_screen.c
index c1c522b..a576abd 100644
--- a/src/gallium/drivers/r300/r300_screen.c
+++ b/src/gallium/drivers/r300/r300_screen.c
@@ -303,6 +303,8 @@ static int r300_get_shader_param(struct pipe_screen *pscreen, unsigned shader, e
case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
case PIPE_SHADER_CAP_PREFERRED_IR:
return PIPE_SHADER_IR_TGSI;
}
@@ -359,6 +361,8 @@ static int r300_get_shader_param(struct pipe_screen *pscreen, unsigned shader, e
case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
case PIPE_SHADER_CAP_PREFERRED_IR:
return PIPE_SHADER_IR_TGSI;
}
diff --git a/src/gallium/drivers/r600/r600_pipe.c b/src/gallium/drivers/r600/r600_pipe.c
index 75de553..9a97de9 100644
--- a/src/gallium/drivers/r600/r600_pipe.c
+++ b/src/gallium/drivers/r600/r600_pipe.c
@@ -511,6 +511,12 @@ static int r600_get_shader_param(struct pipe_screen* pscreen, unsigned shader, e
case PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ /* due to a bug in the shader compiler, some loops hang
+ * if they are not unrolled, see:
+ * https://bugs.freedesktop.org/show_bug.cgi?id=86720
+ */
+ return 255;
}
return 0;
}
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index c084f03..5f910c9 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -508,6 +508,8 @@ static int si_get_shader_param(struct pipe_screen* pscreen, unsigned shader, enu
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 1;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
return 0;
}
diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 9bf661f..17b042e 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -456,6 +456,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen, unsigned shader,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
/* If we get here, we failed to handle a cap above */
debug_printf("Unexpected fragment shader query %u\n", param);
@@ -512,6 +514,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen, unsigned shader,
case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
return 0;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
}
/* If we get here, we failed to handle a cap above */
debug_printf("Unexpected vertex shader query %u\n", param);
diff --git a/src/gallium/drivers/vc4/vc4_screen.c b/src/gallium/drivers/vc4/vc4_screen.c
index 3b12464..774ec09 100644
--- a/src/gallium/drivers/vc4/vc4_screen.c
+++ b/src/gallium/drivers/vc4/vc4_screen.c
@@ -337,6 +337,8 @@ vc4_screen_get_shader_param(struct pipe_screen *pscreen, unsigned shader,
return VC4_MAX_TEXTURE_SAMPLERS;
case PIPE_SHADER_CAP_PREFERRED_IR:
return PIPE_SHADER_IR_TGSI;
+ case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+ return 32;
default:
fprintf(stderr, "unknown shader param %d\n", param);
return 0;
diff --git a/src/gallium/include/pipe/p_defines.h b/src/gallium/include/pipe/p_defines.h
index 3a1265d..1ad545a 100644
--- a/src/gallium/include/pipe/p_defines.h
+++ b/src/gallium/include/pipe/p_defines.h
@@ -697,7 +697,8 @@ enum pipe_shader_cap
PIPE_SHADER_CAP_TGSI_DROUND_SUPPORTED, /* all rounding modes */
PIPE_SHADER_CAP_TGSI_DFRACEXP_DLDEXP_SUPPORTED,
PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED,
- PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE
+ PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE,
+ PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT,
};
/**
diff --git a/src/mesa/state_tracker/st_extensions.c b/src/mesa/state_tracker/st_extensions.c
index e290292..d4724b4 100644
--- a/src/mesa/state_tracker/st_extensions.c
+++ b/src/mesa/state_tracker/st_extensions.c
@@ -249,6 +249,9 @@ void st_init_limits(struct pipe_screen *screen,
if (options->EmitNoLoops)
options->MaxUnrollIterations = MIN2(screen->get_shader_param(screen, sh, PIPE_SHADER_CAP_MAX_INSTRUCTIONS), 65536);
+ else
+ options->MaxUnrollIterations = screen->get_shader_param(screen, sh,
+ PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT);
options->LowerClipDistance = true;
}
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