ac,radeonsi: add ac_gpu_info::lds_size_per_cu

Both RadeonSI and RADV use the WGP mode, so we can assume 128KB on
GFX10.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3899>

diff --git a/src/amd/common/ac_gpu_info.c b/src/amd/common/ac_gpu_info.c
index b8230fd..667070c 100644 (file)
--- a/src/amd/common/ac_gpu_info.c
+++ b/src/amd/common/ac_gpu_info.c
@@ -496,6 +496,13 @@ bool ac_query_gpu_info(int fd, void *dev_p,
        }
        info->r600_has_virtual_memory = true;
 
+       /* LDS is 64KB per CU (4 SIMDs), which is 16KB per SIMD (usage above
+        * 16KB makes some SIMDs unoccupied).
+        *
+        * LDS is 128KB in WGP mode and 64KB in CU mode. Assume the WGP mode is used.
+        */
+       info->lds_size_per_cu = info->chip_class >= GFX10 ? 128 * 1024 : 64 * 1024;
+
        assert(util_is_power_of_two_or_zero(dma.available_rings + 1));
        assert(util_is_power_of_two_or_zero(compute.available_rings + 1));
 
@@ -761,6 +768,7 @@ void ac_print_gpu_info(struct radeon_info *info)
        printf("    tcc_cache_line_size = %u\n", info->tcc_cache_line_size);
        printf("    tcc_harvested = %u\n", info->tcc_harvested);
        printf("    pc_lines = %u\n", info->pc_lines);
+       printf("    lds_size_per_cu = %u\n", info->lds_size_per_cu);
 
        printf("CP info:\n");
        printf("    gfx_ib_pad_with_type2 = %i\n", info->gfx_ib_pad_with_type2);

diff --git a/src/amd/common/ac_gpu_info.h b/src/amd/common/ac_gpu_info.h
index 08ded09..18c1bb1 100644 (file)
--- a/src/amd/common/ac_gpu_info.h
+++ b/src/amd/common/ac_gpu_info.h
@@ -97,6 +97,7 @@ struct radeon_info {
        uint32_t                    tcc_cache_line_size;
        bool                        tcc_harvested;
        unsigned                    pc_lines;
+       uint32_t                    lds_size_per_cu;
 
        /* CP info. */
        bool                        gfx_ib_pad_with_type2;

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index fa35489..12878cf 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -1063,13 +1063,7 @@ static void si_calculate_max_simd_waves(struct si_shader *shader)
                max_simd_waves = MIN2(max_simd_waves, max_vgprs / conf->num_vgprs);
        }
 
-       /* LDS is 64KB per CU (4 SIMDs) on GFX6-9, which is 16KB per SIMD (usage above
-        * 16KB makes some SIMDs unoccupied).
-        *
-        * LDS is 128KB in WGP mode and 64KB in CU mode. Assume the WGP mode is used.
-        */
-       unsigned max_lds_size = sscreen->info.chip_class >= GFX10 ? 128*1024 : 64*1024;
-       unsigned max_lds_per_simd = max_lds_size / 4;
+       unsigned max_lds_per_simd = sscreen->info.lds_size_per_cu / 4;
        if (lds_per_wave)
                max_simd_waves = MIN2(max_simd_waves, max_lds_per_simd / lds_per_wave);