[Mesa-dev] [PATCH 07/27] i965: Enable gather push constants
Abdiel Janulgue
abdiel.janulgue at linux.intel.com
Tue Apr 28 13:08:04 PDT 2015
The 3DSTATE_GATHER_POOL_ALLOC is used to enable or disable the gather
push constants feature within a context. This patch provides the toggle
functionality of using gather push constants to program constant data
within a batch.
Using gather push constants require that a gather pool be allocated so
that the resource streamer can flush the packed constants it gathered.
The pool is later referenced by the 3DSTATE_CONSTANT_* command to
program the push constant data.
Also introduce INTEL_UBO_GATHER to selectively enable which shader stage
uses gather constants for ubo fetches.
Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
---
src/mesa/drivers/dri/i965/brw_binding_tables.c | 43 +++++++++++++++++++++++++-
src/mesa/drivers/dri/i965/brw_context.c | 37 ++++++++++++++++++++++
src/mesa/drivers/dri/i965/brw_context.h | 10 ++++++
src/mesa/drivers/dri/i965/brw_state.h | 1 +
4 files changed, 90 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_binding_tables.c b/src/mesa/drivers/dri/i965/brw_binding_tables.c
index c1d188e..4793fbc 100644
--- a/src/mesa/drivers/dri/i965/brw_binding_tables.c
+++ b/src/mesa/drivers/dri/i965/brw_binding_tables.c
@@ -236,9 +236,47 @@ gen7_update_binding_table_from_array(struct brw_context *brw,
ADVANCE_BATCH();
}
+static void
+gen7_init_gather_pool(struct brw_context *brw)
+{
+ if (!brw->has_resource_streamer)
+ return;
+
+ if (!brw->gather_pool.bo) {
+ brw->gather_pool.bo = drm_intel_bo_alloc(brw->bufmgr, "gather_pool",
+ brw->gather_pool.size, 4096);
+ brw->gather_pool.next_offset = 0;
+ }
+}
+
+void
+gen7_toggle_gather_constants(struct brw_context *brw, bool enable)
+{
+ if (enable && !brw->has_resource_streamer)
+ return;
+
+ uint32_t dw1 = brw->is_haswell ? HSW_GATHER_CONSTANTS_RESERVED : 0;
+
+ BEGIN_BATCH(3);
+ OUT_BATCH(_3DSTATE_GATHER_POOL_ALLOC << 16 | (3 - 2));
+ if (enable) {
+ dw1 |= SET_FIELD(BRW_GATHER_CONSTANTS_ON, BRW_GATHER_CONSTANTS_ENABLE) |
+ (brw->is_haswell ? GEN7_MOCS_L3 : 0);
+ OUT_RELOC(brw->gather_pool.bo, I915_GEM_DOMAIN_SAMPLER, 0, dw1);
+ OUT_RELOC(brw->gather_pool.bo, I915_GEM_DOMAIN_SAMPLER, 0,
+ brw->gather_pool.bo->size);
+ } else {
+ OUT_BATCH(dw1);
+ OUT_BATCH(0);
+ }
+ ADVANCE_BATCH();
+}
+
void
gen7_disable_hw_binding_tables(struct brw_context *brw)
{
+ gen7_toggle_gather_constants(brw, false);
+
BEGIN_BATCH(3);
OUT_BATCH(_3DSTATE_BINDING_TABLE_POOL_ALLOC << 16 | (3 - 2));
OUT_BATCH(SET_FIELD(BRW_HW_BINDING_TABLE_OFF, BRW_HW_BINDING_TABLE_ENABLE) |
@@ -280,6 +318,9 @@ gen7_enable_hw_binding_tables(struct brw_context *brw)
brw->hw_bt_pool.bo->size);
ADVANCE_BATCH();
+ gen7_init_gather_pool(brw);
+ gen7_toggle_gather_constants(brw, true);
+
/* Pipe control workaround */
brw_emit_pipe_control_flush(brw, PIPE_CONTROL_STATE_CACHE_INVALIDATE);
}
@@ -288,6 +329,7 @@ void
gen7_reset_rs_pool_offsets(struct brw_context *brw)
{
brw->hw_bt_pool.next_offset = HW_BT_START_OFFSET;
+ brw->gather_pool.next_offset = 0;
}
const struct brw_tracked_state gen7_hw_binding_tables = {
@@ -371,5 +413,4 @@ const struct brw_tracked_state gen6_binding_table_pointers = {
},
.emit = gen6_upload_binding_table_pointers,
};
-
/** @} */
diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 9c7ccae..685ca70 100644
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -67,6 +67,7 @@
#include "tnl/tnl.h"
#include "tnl/t_pipeline.h"
#include "util/ralloc.h"
+#include "util/u_atomic.h"
#include "glsl/nir/nir.h"
@@ -692,6 +693,25 @@ brw_get_revision(int fd)
return revision;
}
+static void
+brw_process_intel_gather_variable(struct brw_context *brw)
+{
+ uint64_t INTEL_UBO_GATHER = 0;
+
+ static const struct dri_debug_control gather_control[] = {
+ { "vs", (1 << MESA_SHADER_VERTEX)},
+ { "gs", (1 << MESA_SHADER_GEOMETRY)},
+ { "fs", (1 << MESA_SHADER_FRAGMENT)},
+ { NULL, 0 }
+ };
+ uint64_t intel_ubo_gather = driParseDebugString(getenv("INTEL_UBO_GATHER"), gather_control);
+ (void) p_atomic_cmpxchg(&INTEL_UBO_GATHER, 0, intel_ubo_gather);
+
+ brw->vs_ubo_gather = (INTEL_UBO_GATHER & (1 << MESA_SHADER_VERTEX));
+ brw->gs_ubo_gather = (INTEL_UBO_GATHER & (1 << MESA_SHADER_GEOMETRY));
+ brw->fs_ubo_gather = (INTEL_UBO_GATHER & (1 << MESA_SHADER_FRAGMENT));
+}
+
GLboolean
brwCreateContext(gl_api api,
const struct gl_config *mesaVis,
@@ -755,6 +775,10 @@ brwCreateContext(gl_api api,
brw->must_use_separate_stencil = screen->hw_must_use_separate_stencil;
brw->has_swizzling = screen->hw_has_swizzling;
+ brw_process_intel_gather_variable(brw);
+ brw->has_resource_streamer = brw->is_haswell &&
+ (brw->vs_ubo_gather || brw->gs_ubo_gather || brw->fs_ubo_gather);
+
brw->vs.base.stage = MESA_SHADER_VERTEX;
brw->gs.base.stage = MESA_SHADER_GEOMETRY;
brw->wm.base.stage = MESA_SHADER_FRAGMENT;
@@ -900,6 +924,16 @@ brwCreateContext(gl_api api,
if ((flags & __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS) != 0)
ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
+ /* The gather pool is required by the hardware to represent all combined
+ * constants gathered from various sources where it is then fed into the push
+ * constant state. There is no fixed amount how many constant
+ * states are uploaded per batch, so use the combined per-stage limits instead.
+ */
+ brw->gather_pool.size =
+ brw->ctx.Const.Program[MESA_SHADER_VERTEX].MaxCombinedUniformComponents +
+ brw->ctx.Const.Program[MESA_SHADER_GEOMETRY].MaxCombinedUniformComponents +
+ brw->ctx.Const.Program[MESA_SHADER_FRAGMENT].MaxCombinedUniformComponents;
+
if (INTEL_DEBUG & DEBUG_SHADER_TIME)
brw_init_shader_time(brw);
@@ -954,7 +988,10 @@ intelDestroyContext(__DRIcontext * driContextPriv)
drm_intel_bo_unreference(brw->wm.base.scratch_bo);
gen7_reset_rs_pool_offsets(brw);
+ drm_intel_bo_unreference(brw->gather_pool.bo);
drm_intel_bo_unreference(brw->hw_bt_pool.bo);
+
+ brw->gather_pool.bo = NULL;
brw->hw_bt_pool.bo = NULL;
drm_intel_gem_context_destroy(brw->hw_ctx);
diff --git a/src/mesa/drivers/dri/i965/brw_context.h b/src/mesa/drivers/dri/i965/brw_context.h
index 1c72b74..7fd49e9 100644
--- a/src/mesa/drivers/dri/i965/brw_context.h
+++ b/src/mesa/drivers/dri/i965/brw_context.h
@@ -1106,6 +1106,9 @@ struct brw_context
bool use_rep_send;
bool scalar_vs;
bool has_resource_streamer;
+ bool vs_ubo_gather;
+ bool gs_ubo_gather;
+ bool fs_ubo_gather;
/**
* Some versions of Gen hardware don't do centroid interpolation correctly
@@ -1366,6 +1369,13 @@ struct brw_context
uint32_t next_offset;
} hw_bt_pool;
+ /* Internal storage used by the resource streamer to flush and refer to constant data*/
+ struct {
+ drm_intel_bo *bo;
+ uint32_t next_offset;
+ uint32_t size;
+ } gather_pool;
+
struct {
uint32_t state_offset;
uint32_t blend_state_offset;
diff --git a/src/mesa/drivers/dri/i965/brw_state.h b/src/mesa/drivers/dri/i965/brw_state.h
index 129a780..342157d 100644
--- a/src/mesa/drivers/dri/i965/brw_state.h
+++ b/src/mesa/drivers/dri/i965/brw_state.h
@@ -312,6 +312,7 @@ void gen7_update_binding_table_from_array(struct brw_context *brw,
void gen7_enable_hw_binding_tables(struct brw_context *brw);
void gen7_disable_hw_binding_tables(struct brw_context *brw);
void gen7_reset_rs_pool_offsets(struct brw_context *brw);
+void gen7_toggle_gather_constants(struct brw_context *brw, bool enable);
#ifdef __cplusplus
}
--
1.9.1
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