iris: Split iris_flush_and_dirty_for_history into two helpers.

We create two new helpers, iris_flush_bits_for_history, and
iris_dirty_for_history, then use them in the existing function.

The first accumulates flush bits based on res->bind_history, but doesn't
actually perform a flush.  This allows us to accumulate flush bits by
looping over multiple resources, but ultimately emit a single flush for
all of them.

The latter flags dirty bits without flushing, which again allows us to
handle multiple resources, but also is more convenient when writing from
the CPU where we don't need a flush (as in commit 4d12236072).

2 files changed, 46 insertions, 20 deletions

diff --git a/src/gallium/drivers/iris/iris_resource.c b/src/gallium/drivers/iris/iris_resource.c
index 7013d5e8984..fd50139defc 100644
--- a/src/gallium/drivers/iris/iris_resource.c
+++ b/src/gallium/drivers/iris/iris_resource.c
@@ -1495,7 +1495,7 @@ iris_transfer_flush_region(struct pipe_context *ctx,
    /* Make sure we flag constants dirty even if there's no need to emit
     * any PIPE_CONTROLs to a batch.
     */
-   iris_flush_and_dirty_for_history(ice, NULL, res);
+   iris_dirty_for_history(ice, res);
 }
 
 static void
@@ -1521,27 +1521,16 @@ iris_transfer_unmap(struct pipe_context *ctx, struct pipe_transfer *xfer)
    slab_free(&ice->transfer_pool, map);
 }
 
+/**
+ * Mark state dirty that needs to be re-emitted when a resource is written.
+ */
 void
-iris_flush_and_dirty_for_history(struct iris_context *ice,
-                                 struct iris_batch *batch,
-                                 struct iris_resource *res)
+iris_dirty_for_history(struct iris_context *ice,
+                       struct iris_resource *res)
 {
-   if (res->base.target != PIPE_BUFFER)
-      return;
-
-   unsigned flush = PIPE_CONTROL_CS_STALL;
-
-   /* We've likely used the rendering engine (i.e. BLORP) to write to this
-    * surface.  Flush the render cache so the data actually lands.
-    */
-   if (batch && batch->name != IRIS_BATCH_COMPUTE)
-      flush |= PIPE_CONTROL_RENDER_TARGET_FLUSH;
-
    uint64_t dirty = 0ull;
 
    if (res->bind_history & PIPE_BIND_CONSTANT_BUFFER) {
-      flush |= PIPE_CONTROL_CONST_CACHE_INVALIDATE |
-               PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
       dirty |= IRIS_DIRTY_CONSTANTS_VS |
                IRIS_DIRTY_CONSTANTS_TCS |
                IRIS_DIRTY_CONSTANTS_TES |
@@ -1551,6 +1540,23 @@ iris_flush_and_dirty_for_history(struct iris_context *ice,
                IRIS_ALL_DIRTY_BINDINGS;
    }
 
+   ice->state.dirty |= dirty;
+}
+
+/**
+ * Produce a set of PIPE_CONTROL bits which ensure data written to a
+ * resource becomes visible, and any stale read cache data is invalidated.
+ */
+uint32_t
+iris_flush_bits_for_history(struct iris_resource *res)
+{
+   uint32_t flush = PIPE_CONTROL_CS_STALL;
+
+   if (res->bind_history & PIPE_BIND_CONSTANT_BUFFER) {
+      flush |= PIPE_CONTROL_CONST_CACHE_INVALIDATE |
+               PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
+   }
+
    if (res->bind_history & PIPE_BIND_SAMPLER_VIEW)
       flush |= PIPE_CONTROL_TEXTURE_CACHE_INVALIDATE;
 
@@ -1560,10 +1566,26 @@ iris_flush_and_dirty_for_history(struct iris_context *ice,
    if (res->bind_history & (PIPE_BIND_SHADER_BUFFER | PIPE_BIND_SHADER_IMAGE))
       flush |= PIPE_CONTROL_DATA_CACHE_FLUSH;
 
-   if (batch)
-      iris_emit_pipe_control_flush(batch, flush);
+   return flush;
+}
 
-   ice->state.dirty |= dirty;
+void
+iris_flush_and_dirty_for_history(struct iris_context *ice,
+                                 struct iris_batch *batch,
+                                 struct iris_resource *res)
+{
+   if (res->base.target != PIPE_BUFFER)
+      return;
+
+   uint32_t flush = iris_flush_bits_for_history(res);
+
+   /* We've likely used the rendering engine (i.e. BLORP) to write to this
+    * surface.  Flush the render cache so the data actually lands.
+    */
+   if (batch->name != IRIS_BATCH_COMPUTE)
+      flush |= PIPE_CONTROL_RENDER_TARGET_FLUSH;
+
+   iris_emit_pipe_control_flush(batch, flush);
 }
 
 bool
diff --git a/src/gallium/drivers/iris/iris_resource.h b/src/gallium/drivers/iris/iris_resource.h
index 2a21f4edb90..7cb6767b2f9 100644
--- a/src/gallium/drivers/iris/iris_resource.h
+++ b/src/gallium/drivers/iris/iris_resource.h
@@ -258,6 +258,10 @@ iris_resource_get_clear_color(const struct iris_resource *res,
 
 void iris_init_screen_resource_functions(struct pipe_screen *pscreen);
 
+void iris_dirty_for_history(struct iris_context *ice,
+                            struct iris_resource *res);
+uint32_t iris_flush_bits_for_history(struct iris_resource *res);
+
 void iris_flush_and_dirty_for_history(struct iris_context *ice,
                                       struct iris_batch *batch,
                                       struct iris_resource *res);