From: Marek Olšák <marek.ol...@amd.com>
v2: account for LDS usage in PS
the limit is per SIMD, not per CU
---
src/gallium/drivers/radeonsi/si_shader.c | 54 +++++++++++++++++++++++++++++---
1 file changed, 49 insertions(+), 5 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_shader.c
b/src/gallium/drivers/radeonsi/si_shader.c
index 1bd617f..33c0db6 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -4001,22 +4001,65 @@ static void si_shader_dump_disassembly(const struct
radeon_shader_binary *binary
static void si_shader_dump_stats(struct si_screen *sscreen,
struct si_shader_config *conf,
+ unsigned num_inputs,
unsigned code_size,
struct pipe_debug_callback *debug,
unsigned processor)
{
+ unsigned lds_increment = sscreen->b.chip_class >= CIK ? 512 : 256;
+ unsigned lds_per_wave = 0;
+ unsigned max_simd_waves = 10;
+
+ /* Compute LDS usage for PS. */
+ if (processor == TGSI_PROCESSOR_FRAGMENT) {
+ /* The minimum usage per wave is (num_inputs * 36). The maximum
+ * usage is (num_inputs * 36 * 16).
+ * We can get anything in between and it varies between waves.
+ *
+ * Other stages don't know the size at compile time or don't
+ * allocate LDS per wave, but instead they do it per thread
group.
+ */
+ lds_per_wave = conf->lds_size * lds_increment +
+ align(num_inputs * 36, lds_increment);
+ }
+
+ /* Compute the per-SIMD wave counts. */
+ if (conf->num_sgprs) {
+ if (sscreen->b.chip_class >= VI)
+ max_simd_waves = MIN2(max_simd_waves, 800 /
conf->num_sgprs);
+ else
+ max_simd_waves = MIN2(max_simd_waves, 512 /
conf->num_sgprs);
+ }
+
+ if (conf->num_vgprs)
+ max_simd_waves = MIN2(max_simd_waves, 256 / conf->num_vgprs);
+
+ /* LDS is 64KB per CU (4 SIMDs), divided into 16KB blocks per SIMD
+ * that PS can use.
+ */
+ if (lds_per_wave)
+ max_simd_waves = MIN2(max_simd_waves, 16384 / lds_per_wave);
+
if (r600_can_dump_shader(&sscreen->b, processor)) {
fprintf(stderr, "*** SHADER STATS ***\n"
- "SGPRS: %d\nVGPRS: %d\nCode Size: %d bytes\nLDS: %d
blocks\n"
- "Scratch: %d bytes per wave\n********************\n",
+ "SGPRS: %d\n"
+ "VGPRS: %d\n"
+ "Code Size: %d bytes\n"
+ "LDS: %d blocks\n"
+ "Scratch: %d bytes per wave\n"
+ "Max Waves: %d\n"
+ "********************\n",
conf->num_sgprs, conf->num_vgprs, code_size,
- conf->lds_size, conf->scratch_bytes_per_wave);
+ conf->lds_size, conf->scratch_bytes_per_wave,
+ max_simd_waves);
}
pipe_debug_message(debug, SHADER_INFO,
- "Shader Stats: SGPRS: %d VGPRS: %d Code Size: %d
LDS: %d Scratch: %d",
+ "Shader Stats: SGPRS: %d VGPRS: %d Code Size: %d "
+ "LDS: %d Scratch: %d Max Waves: %d",
conf->num_sgprs, conf->num_vgprs, code_size,
- conf->lds_size, conf->scratch_bytes_per_wave);
+ conf->lds_size, conf->scratch_bytes_per_wave,
+ max_simd_waves);
}
void si_shader_dump(struct si_screen *sscreen, struct si_shader *shader,
@@ -4027,6 +4070,7 @@ void si_shader_dump(struct si_screen *sscreen, struct
si_shader *shader,
si_shader_dump_disassembly(&shader->binary, debug);
si_shader_dump_stats(sscreen, &shader->config,
+ shader->selector->info.num_inputs,
shader->binary.code_size, debug, processor);
}
--
2.1.4
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