etnaviv: add context flush sw query

Context flushes can be caused by all kinds of operations that aren't
obvious to a GL API user. As those are quite heavy-weight operations
it is nice to have some insight into how many of those are happening
per frame. Add a sw query to make this information easily accessible.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34350>

src/gallium/drivers/etnaviv/etnaviv_context.c

@@ -558,6 +558,8 @@ etna_flush(struct pipe_context *pctx, struct pipe_fence_handle **fence,
    struct etna_context *ctx = etna_context(pctx);
    int out_fence_fd = -1;
 
+   ctx->stats.flushes++;
+
    list_for_each_entry(struct etna_acc_query, aq, &ctx->active_acc_queries, node)
       etna_acc_query_suspend(aq, ctx);
 

src/gallium/drivers/etnaviv/etnaviv_context.h

@@ -192,6 +192,7 @@ struct etna_context {
       uint64_t prims_generated;
       uint64_t draw_calls;
       uint64_t rs_operations;
+      uint64_t flushes;
    } stats;
 
    int in_fence_fd;

src/gallium/drivers/etnaviv/etnaviv_query_sw.c

@@ -51,6 +51,8 @@ read_counter(struct etna_context *ctx, unsigned type)
       return ctx->stats.draw_calls;
    case ETNA_QUERY_RS_OPERATIONS:
       return ctx->stats.rs_operations;
+   case ETNA_QUERY_CTX_FLUSHES:
+      return ctx->stats.flushes;
    }
 
    return 0;
@@ -100,6 +102,7 @@ etna_sw_create_query(struct etna_context *ctx, unsigned query_type)
    case PIPE_QUERY_PRIMITIVES_GENERATED:
    case ETNA_QUERY_DRAW_CALLS:
    case ETNA_QUERY_RS_OPERATIONS:
+   case ETNA_QUERY_CTX_FLUSHES:
       break;
    default:
       return NULL;
@@ -120,6 +123,7 @@ static const struct pipe_driver_query_info list[] = {
    {"prims-generated", PIPE_QUERY_PRIMITIVES_GENERATED, { 0 }},
    {"draw-calls", ETNA_QUERY_DRAW_CALLS, { 0 }},
    {"rs-operations", ETNA_QUERY_RS_OPERATIONS, { 0 }},
+   {"ctx-flushes", ETNA_QUERY_CTX_FLUSHES, { 0 }},
 };
 
 int

src/gallium/drivers/etnaviv/etnaviv_query_sw.h

@@ -32,6 +32,7 @@
 
 #define ETNA_QUERY_DRAW_CALLS    (ETNA_SW_QUERY_BASE + 0)
 #define ETNA_QUERY_RS_OPERATIONS (ETNA_SW_QUERY_BASE + 1)
+#define ETNA_QUERY_CTX_FLUSHES   (ETNA_SW_QUERY_BASE + 2)
 
 struct etna_sw_query {
    struct etna_query base;