[Mesa-dev] [PATCH 5/5] radeonsi: calculate optimal GS ring sizes to fix GS hangs on Tonga
Marek Olšák
maraeo at gmail.com
Sun Nov 8 14:00:58 PST 2015
From: Marek Olšák <marek.olsak at amd.com>
I discovered that increasing the ESGS ring size fixes GS hangs on Tonga,
so let's do it properly.
There is now a separate init_config_gs_rings state that is not immutable,
because GS rings are resized when needed.
This also saves some memory. Most apps won't need more than 1MB
per ring per shader engine.
---
src/gallium/drivers/radeonsi/si_hw_context.c | 2 +
src/gallium/drivers/radeonsi/si_pipe.c | 2 +
src/gallium/drivers/radeonsi/si_pipe.h | 1 +
src/gallium/drivers/radeonsi/si_shader.h | 1 +
src/gallium/drivers/radeonsi/si_state_shaders.c | 153 ++++++++++++++++--------
5 files changed, 112 insertions(+), 47 deletions(-)
diff --git a/src/gallium/drivers/radeonsi/si_hw_context.c b/src/gallium/drivers/radeonsi/si_hw_context.c
index f28c11c..baa0229 100644
--- a/src/gallium/drivers/radeonsi/si_hw_context.c
+++ b/src/gallium/drivers/radeonsi/si_hw_context.c
@@ -165,6 +165,8 @@ void si_begin_new_cs(struct si_context *ctx)
/* The CS initialization should be emitted before everything else. */
si_pm4_emit(ctx, ctx->init_config);
+ if (ctx->init_config_gs_rings)
+ si_pm4_emit(ctx, ctx->init_config_gs_rings);
ctx->framebuffer.dirty_cbufs = (1 << 8) - 1;
ctx->framebuffer.dirty_zsbuf = true;
diff --git a/src/gallium/drivers/radeonsi/si_pipe.c b/src/gallium/drivers/radeonsi/si_pipe.c
index 2b9784f..1cbee8d 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.c
+++ b/src/gallium/drivers/radeonsi/si_pipe.c
@@ -50,6 +50,8 @@ static void si_destroy_context(struct pipe_context *context)
sctx->b.ws->fence_reference(&sctx->last_gfx_fence, NULL);
si_pm4_free_state(sctx, sctx->init_config, ~0);
+ if (sctx->init_config_gs_rings)
+ si_pm4_free_state(sctx, sctx->init_config_gs_rings, ~0);
for (i = 0; i < Elements(sctx->vgt_shader_config); i++)
si_pm4_delete_state(sctx, vgt_shader_config, sctx->vgt_shader_config[i]);
diff --git a/src/gallium/drivers/radeonsi/si_pipe.h b/src/gallium/drivers/radeonsi/si_pipe.h
index 6e742fc..05d52fe 100644
--- a/src/gallium/drivers/radeonsi/si_pipe.h
+++ b/src/gallium/drivers/radeonsi/si_pipe.h
@@ -202,6 +202,7 @@ struct si_context {
/* Precomputed states. */
struct si_pm4_state *init_config;
+ struct si_pm4_state *init_config_gs_rings;
bool init_config_has_vgt_flush;
struct si_pm4_state *vgt_shader_config[4];
diff --git a/src/gallium/drivers/radeonsi/si_shader.h b/src/gallium/drivers/radeonsi/si_shader.h
index 1f4f0de..3400a03 100644
--- a/src/gallium/drivers/radeonsi/si_shader.h
+++ b/src/gallium/drivers/radeonsi/si_shader.h
@@ -202,6 +202,7 @@ struct si_shader_selector {
bool forces_persample_interp_for_linear;
unsigned esgs_itemsize;
+ unsigned gs_input_verts_per_prim;
unsigned gs_output_prim;
unsigned gs_max_out_vertices;
unsigned gs_num_invocations;
diff --git a/src/gallium/drivers/radeonsi/si_state_shaders.c b/src/gallium/drivers/radeonsi/si_state_shaders.c
index c402ce2..b543971 100644
--- a/src/gallium/drivers/radeonsi/si_state_shaders.c
+++ b/src/gallium/drivers/radeonsi/si_state_shaders.c
@@ -33,6 +33,7 @@
#include "tgsi/tgsi_parse.h"
#include "tgsi/tgsi_ureg.h"
#include "util/u_memory.h"
+#include "util/u_prim.h"
#include "util/u_simple_shaders.h"
static void si_set_tesseval_regs(struct si_shader *shader,
@@ -703,6 +704,9 @@ static void *si_create_shader_selector(struct pipe_context *ctx,
for (i = 0; i < sel->so.num_outputs; i++)
sel->max_gs_stream = MAX2(sel->max_gs_stream,
sel->so.output[i].stream);
+
+ sel->gs_input_verts_per_prim =
+ u_vertices_per_prim(sel->info.properties[TGSI_PROPERTY_GS_INPUT_PRIM]);
break;
case PIPE_SHADER_VERTEX:
@@ -1054,6 +1058,7 @@ static void si_init_config_add_vgt_flush(struct si_context *sctx)
if (sctx->init_config_has_vgt_flush)
return;
+ /* VGT_FLUSH is required even if VGT is idle. It resets VGT pointers. */
si_pm4_cmd_begin(sctx->init_config, PKT3_EVENT_WRITE);
si_pm4_cmd_add(sctx->init_config, EVENT_TYPE(V_028A90_VGT_FLUSH) | EVENT_INDEX(0));
si_pm4_cmd_end(sctx->init_config, false);
@@ -1061,62 +1066,119 @@ static void si_init_config_add_vgt_flush(struct si_context *sctx)
}
/* Initialize state related to ESGS / GSVS ring buffers */
-static void si_init_gs_rings(struct si_context *sctx)
+static bool si_update_gs_ring_buffers(struct si_context *sctx)
{
- unsigned esgs_ring_size = 128 * 1024;
- unsigned gsvs_ring_size = 60 * 1024 * 1024;
+ struct si_shader_selector *es =
+ sctx->tes_shader.cso ? sctx->tes_shader.cso : sctx->vs_shader.cso;
+ struct si_shader_selector *gs = sctx->gs_shader.cso;
+ struct si_pm4_state *pm4;
- assert(!sctx->esgs_ring && !sctx->gsvs_ring);
+ /* Chip constants. */
+ unsigned num_se = sctx->screen->b.info.max_se;
+ unsigned wave_size = 64;
+ unsigned max_gs_waves = 32 * num_se; /* max 32 per SE on GCN */
+ unsigned gs_vertex_reuse = 16 * num_se; /* GS_VERTEX_REUSE register (per SE) */
+ unsigned alignment = 256 * num_se;
+ /* The maximum size is 63.999 MB per SE. */
+ unsigned max_size = ((unsigned)(63.999 * 1024 * 1024) & ~255) * num_se;
+
+ /* Calculate the minimum size. */
+ unsigned min_esgs_ring_size = align(es->esgs_itemsize * gs_vertex_reuse *
+ wave_size, alignment);
+
+ /* These are recommended sizes, not minimum sizes. */
+ unsigned esgs_ring_size = max_gs_waves * 2 * wave_size *
+ es->esgs_itemsize * gs->gs_input_verts_per_prim;
+ unsigned gsvs_ring_size = max_gs_waves * 2 * wave_size *
+ gs->max_gsvs_emit_size * (gs->max_gs_stream + 1);
+
+ min_esgs_ring_size = align(min_esgs_ring_size, alignment);
+ esgs_ring_size = align(esgs_ring_size, alignment);
+ gsvs_ring_size = align(gsvs_ring_size, alignment);
+
+ esgs_ring_size = CLAMP(esgs_ring_size, min_esgs_ring_size, max_size);
+ gsvs_ring_size = MIN2(gsvs_ring_size, max_size);
+
+ /* Some rings don't have to be allocated if shaders don't use them.
+ * (e.g. no varyings between ES and GS or GS and PS)
+ */
+ bool update_esgs = esgs_ring_size &&
+ (!sctx->esgs_ring ||
+ sctx->esgs_ring->width0 < esgs_ring_size);
+ bool update_gsvs = gsvs_ring_size &&
+ (!sctx->gsvs_ring ||
+ sctx->gsvs_ring->width0 < gsvs_ring_size);
- sctx->esgs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
- PIPE_USAGE_DEFAULT, esgs_ring_size);
- if (!sctx->esgs_ring)
- return;
+ if (!update_esgs && !update_gsvs)
+ return true;
- sctx->gsvs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
- PIPE_USAGE_DEFAULT, gsvs_ring_size);
- if (!sctx->gsvs_ring) {
+ if (update_esgs) {
pipe_resource_reference(&sctx->esgs_ring, NULL);
- return;
+ sctx->esgs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
+ PIPE_USAGE_DEFAULT,
+ esgs_ring_size);
+ if (!sctx->esgs_ring)
+ return false;
}
- si_init_config_add_vgt_flush(sctx);
+ if (update_gsvs) {
+ pipe_resource_reference(&sctx->gsvs_ring, NULL);
+ sctx->gsvs_ring = pipe_buffer_create(sctx->b.b.screen, PIPE_BIND_CUSTOM,
+ PIPE_USAGE_DEFAULT,
+ gsvs_ring_size);
+ if (!sctx->gsvs_ring)
+ return false;
+ }
+
+ /* Create the "init_config_gs_rings" state. */
+ pm4 = CALLOC_STRUCT(si_pm4_state);
+ if (!pm4)
+ return false;
- /* Append these registers to the init config state. */
if (sctx->b.chip_class >= CIK) {
- if (sctx->b.chip_class >= VI) {
- /* The maximum sizes are 63.999 MB on VI, because
- * the register fields only have 18 bits. */
- assert(esgs_ring_size / 256 < (1 << 18));
- assert(gsvs_ring_size / 256 < (1 << 18));
- }
- si_pm4_set_reg(sctx->init_config, R_030900_VGT_ESGS_RING_SIZE,
- esgs_ring_size / 256);
- si_pm4_set_reg(sctx->init_config, R_030904_VGT_GSVS_RING_SIZE,
- gsvs_ring_size / 256);
+ if (sctx->esgs_ring)
+ si_pm4_set_reg(pm4, R_030900_VGT_ESGS_RING_SIZE,
+ sctx->esgs_ring->width0 / 256);
+ if (sctx->gsvs_ring)
+ si_pm4_set_reg(pm4, R_030904_VGT_GSVS_RING_SIZE,
+ sctx->gsvs_ring->width0 / 256);
} else {
- si_pm4_set_reg(sctx->init_config, R_0088C8_VGT_ESGS_RING_SIZE,
- esgs_ring_size / 256);
- si_pm4_set_reg(sctx->init_config, R_0088CC_VGT_GSVS_RING_SIZE,
- gsvs_ring_size / 256);
+ if (sctx->esgs_ring)
+ si_pm4_set_reg(pm4, R_0088C8_VGT_ESGS_RING_SIZE,
+ sctx->esgs_ring->width0 / 256);
+ if (sctx->gsvs_ring)
+ si_pm4_set_reg(pm4, R_0088CC_VGT_GSVS_RING_SIZE,
+ sctx->gsvs_ring->width0 / 256);
}
- /* Flush the context to re-emit the init_config state.
- * This is done only once in a lifetime of a context.
- */
- si_pm4_upload_indirect_buffer(sctx, sctx->init_config);
+ /* Set the state. */
+ if (sctx->init_config_gs_rings)
+ si_pm4_free_state(sctx, sctx->init_config_gs_rings, ~0);
+ sctx->init_config_gs_rings = pm4;
+
+ if (!sctx->init_config_has_vgt_flush) {
+ si_init_config_add_vgt_flush(sctx);
+ si_pm4_upload_indirect_buffer(sctx, sctx->init_config);
+ }
+
+ /* Flush the context to re-emit the state. */
sctx->b.initial_gfx_cs_size = 0; /* force flush */
si_context_gfx_flush(sctx, RADEON_FLUSH_ASYNC, NULL);
- si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_VERTEX, SI_RING_ESGS,
- sctx->esgs_ring, 0, esgs_ring_size,
- true, true, 4, 64, 0);
- si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_GEOMETRY, SI_RING_ESGS,
- sctx->esgs_ring, 0, esgs_ring_size,
- false, false, 0, 0, 0);
- si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_VERTEX, SI_RING_GSVS,
- sctx->gsvs_ring, 0, gsvs_ring_size,
- false, false, 0, 0, 0);
+ /* Set ring bindings. */
+ if (sctx->esgs_ring) {
+ si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_VERTEX, SI_RING_ESGS,
+ sctx->esgs_ring, 0, sctx->esgs_ring->width0,
+ true, true, 4, 64, 0);
+ si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_GEOMETRY, SI_RING_ESGS,
+ sctx->esgs_ring, 0, sctx->esgs_ring->width0,
+ false, false, 0, 0, 0);
+ }
+ if (sctx->gsvs_ring)
+ si_set_ring_buffer(&sctx->b.b, PIPE_SHADER_VERTEX, SI_RING_GSVS,
+ sctx->gsvs_ring, 0, sctx->gsvs_ring->width0,
+ false, false, 0, 0, 0);
+ return true;
}
static void si_update_gsvs_ring_bindings(struct si_context *sctx)
@@ -1124,7 +1186,7 @@ static void si_update_gsvs_ring_bindings(struct si_context *sctx)
unsigned gsvs_itemsize = sctx->gs_shader.cso->max_gsvs_emit_size;
uint64_t offset;
- if (gsvs_itemsize == sctx->last_gsvs_itemsize)
+ if (!sctx->gsvs_ring || gsvs_itemsize == sctx->last_gsvs_itemsize)
return;
sctx->last_gsvs_itemsize = gsvs_itemsize;
@@ -1485,11 +1547,8 @@ bool si_update_shaders(struct si_context *sctx)
si_pm4_bind_state(sctx, vs, sctx->gs_shader.current->gs_copy_shader->pm4);
si_update_so(sctx, sctx->gs_shader.cso);
- if (!sctx->gsvs_ring) {
- si_init_gs_rings(sctx);
- if (!sctx->gsvs_ring)
- return false;
- }
+ if (!si_update_gs_ring_buffers(sctx))
+ return false;
si_update_gsvs_ring_bindings(sctx);
} else {
--
2.1.4
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