etnaviv: optimize transfer flushes

Context flushes that are triggered by a pending write to the resource
don't need to realize visibility of the resource changes outside of
the context. Skip implicit resource flushes in those cases.

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/23549>

src/gallium/drivers/etnaviv/etnaviv_context.c

@@ -506,7 +506,7 @@ etna_reset_gpu_state(struct etna_context *ctx)
    ctx->dirty_sampler_views = ~0L;
 }
 
-static void
+void
 etna_flush(struct pipe_context *pctx, struct pipe_fence_handle **fence,
            enum pipe_flush_flags flags, bool internal)
 {

src/gallium/drivers/etnaviv/etnaviv_context.h

@@ -220,4 +220,8 @@ void
 etna_context_add_flush_resource(struct etna_context *ctx,
                                 struct pipe_resource *rsc);
 
+void
+etna_flush(struct pipe_context *pctx, struct pipe_fence_handle **fence,
+           enum pipe_flush_flags flags, bool internal);
+
 #endif

src/gallium/drivers/etnaviv/etnaviv_rs.c

@@ -822,7 +822,7 @@ manual:
    if (src->layout == ETNA_LAYOUT_TILED && dst->layout == ETNA_LAYOUT_TILED) {
       if ((etna_resource_status(ctx, src) & ETNA_PENDING_WRITE) ||
           (etna_resource_status(ctx, dst) & ETNA_PENDING_WRITE))
-         pctx->flush(pctx, NULL, 0);
+         etna_flush(pctx, NULL, 0, true);
       return etna_manual_blit(dst, dst_lev, dst_offset, src, src_lev, src_offset, blit_info);
    }
 

src/gallium/drivers/etnaviv/etnaviv_transfer.c

@@ -390,7 +390,7 @@ etna_transfer_map(struct pipe_context *pctx, struct pipe_resource *prsc,
           (!trans->rsc &&
            (((usage & PIPE_MAP_READ) && (status & ETNA_PENDING_WRITE)) ||
            ((usage & PIPE_MAP_WRITE) && status)))) {
-         pctx->flush(pctx, NULL, 0);
+         etna_flush(pctx, NULL, 0, true);
       }
 
       if (usage & PIPE_MAP_READ)