lima: optinal flush submit in lima_clear

flush current submit only when there is any draw pending instead of
flush all submits.

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3755>

3 files changed, 16 insertions, 3 deletions

diff --git a/src/gallium/drivers/lima/lima_draw.c b/src/gallium/drivers/lima/lima_draw.c
index 0b1e1f763c8..3b53bdac1d3 100644
--- a/src/gallium/drivers/lima/lima_draw.c
+++ b/src/gallium/drivers/lima/lima_draw.c
@@ -102,8 +102,14 @@ lima_clear(struct pipe_context *pctx, unsigned buffers,
            const union pipe_color_union *color, double depth, unsigned stencil)
 {
    struct lima_context *ctx = lima_context(pctx);
+   struct lima_submit *submit = lima_submit_get(ctx);
 
-   lima_flush(ctx);
+   /* flush if this submit already contains any draw, otherwise multi clear can be
+    * combined into a single submit */
+   if (lima_submit_has_draw_pending(submit)) {
+      lima_do_submit(submit);
+      submit = lima_submit_get(ctx);
+   }
 
    lima_update_submit_wb(ctx, buffers);
 
@@ -113,7 +119,6 @@ lima_clear(struct pipe_context *pctx, unsigned buffers,
       surf->reload = false;
    }
 
-   struct lima_submit *submit = lima_submit_get(ctx);
    struct lima_submit_clear *clear = &submit->clear;
    clear->buffers = buffers;
 
diff --git a/src/gallium/drivers/lima/lima_submit.c b/src/gallium/drivers/lima/lima_submit.c
index d4432037d72..85c28d33776 100644
--- a/src/gallium/drivers/lima/lima_submit.c
+++ b/src/gallium/drivers/lima/lima_submit.c
@@ -815,7 +815,7 @@ lima_pack_pp_frame_reg(struct lima_submit *submit, uint32_t *frame_reg,
       lima_pack_wb_zsbuf_reg(submit, wb_reg, wb_idx++);
 }
 
-static void
+void
 lima_do_submit(struct lima_submit *submit)
 {
    #define pp_stack_pp_size 0x400
diff --git a/src/gallium/drivers/lima/lima_submit.h b/src/gallium/drivers/lima/lima_submit.h
index 538ccfd9aff..87b5aeccf6a 100644
--- a/src/gallium/drivers/lima/lima_submit.h
+++ b/src/gallium/drivers/lima/lima_submit.h
@@ -84,6 +84,12 @@ struct lima_submit {
    struct lima_dump *dump;
 };
 
+static inline bool
+lima_submit_has_draw_pending(struct lima_submit *submit)
+{
+   return !!submit->plbu_cmd_array.size;
+}
+
 struct lima_submit *lima_submit_get(struct lima_context *ctx);
 
 bool lima_submit_add_bo(struct lima_submit *submit, int pipe,
@@ -91,6 +97,8 @@ bool lima_submit_add_bo(struct lima_submit *submit, int pipe,
 void *lima_submit_create_stream_bo(struct lima_submit *submit, int pipe,
                                    unsigned size, uint32_t *va);
 
+void lima_do_submit(struct lima_submit *submit);
+
 bool lima_submit_init(struct lima_context *ctx);
 void lima_submit_fini(struct lima_context *ctx);