freedreno: Move the rsc-based batch flushing to helper functions.

I want to reuse these, and this gives them nice names.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11455>

src/gallium/drivers/freedreno/freedreno_batch_cache.c

@@ -194,6 +194,49 @@ fd_bc_flush(struct fd_context *ctx, bool deferred) assert_dt
    }
 }
 
+/**
+ * Flushes the batch (if any) writing this resource.  Must not hold the screen
+ * lock.
+ */
+void
+fd_bc_flush_writer(struct fd_context *ctx, struct fd_resource *rsc) assert_dt
+{
+   fd_screen_lock(ctx->screen);
+   struct fd_batch *write_batch = NULL;
+   fd_batch_reference_locked(&write_batch, rsc->track->write_batch);
+   fd_screen_unlock(ctx->screen);
+
+   if (write_batch) {
+      fd_batch_flush(write_batch);
+      fd_batch_reference(&write_batch, NULL);
+   }
+}
+
+/**
+ * Flushes any batches reading this resource.  Must not hold the screen lock.
+ */
+void
+fd_bc_flush_readers(struct fd_context *ctx, struct fd_resource *rsc) assert_dt
+{
+   struct fd_batch *batch, *batches[32] = {};
+   uint32_t batch_count = 0;
+
+   /* This is a bit awkward, probably a fd_batch_flush_locked()
+    * would make things simpler.. but we need to hold the lock
+    * to iterate the batches which reference this resource.  So
+    * we must first grab references under a lock, then flush.
+    */
+   fd_screen_lock(ctx->screen);
+   foreach_batch (batch, &ctx->screen->batch_cache, rsc->track->batch_mask)
+      fd_batch_reference_locked(&batches[batch_count++], batch);
+   fd_screen_unlock(ctx->screen);
+
+   for (int i = 0; i < batch_count; i++) {
+      fd_batch_flush(batches[i]);
+      fd_batch_reference(&batches[i], NULL);
+   }
+}
+
 void
 fd_bc_dump(struct fd_context *ctx, const char *fmt, ...)
 {

src/gallium/drivers/freedreno/freedreno_batch_cache.h

@@ -67,6 +67,8 @@ void fd_bc_init(struct fd_batch_cache *cache);
 void fd_bc_fini(struct fd_batch_cache *cache);
 
 void fd_bc_flush(struct fd_context *ctx, bool deferred) assert_dt;
+void fd_bc_flush_writer(struct fd_context *ctx, struct fd_resource *rsc) assert_dt;
+void fd_bc_flush_readers(struct fd_context *ctx, struct fd_resource *rsc) assert_dt;
 void fd_bc_dump(struct fd_context *ctx, const char *fmt, ...)
    _util_printf_format(2, 3);
 

src/gallium/drivers/freedreno/freedreno_resource.c

@@ -667,32 +667,9 @@ flush_resource(struct fd_context *ctx, struct fd_resource *rsc,
                unsigned usage) assert_dt
 {
    if (usage & PIPE_MAP_WRITE) {
-      struct fd_batch *batch, *batches[32] = {};
-      uint32_t batch_count = 0;
-
-      /* This is a bit awkward, probably a fd_batch_flush_locked()
-       * would make things simpler.. but we need to hold the lock
-       * to iterate the batches which reference this resource.  So
-       * we must first grab references under a lock, then flush.
-       */
-      fd_screen_lock(ctx->screen);
-      foreach_batch (batch, &ctx->screen->batch_cache, rsc->track->batch_mask)
-         fd_batch_reference_locked(&batches[batch_count++], batch);
-      fd_screen_unlock(ctx->screen);
-
-      for (int i = 0; i < batch_count; i++) {
-         fd_batch_flush(batches[i]);
-         fd_batch_reference(&batches[i], NULL);
-      }
+      fd_bc_flush_readers(ctx, rsc);
    } else {
-      struct fd_batch *write_batch = NULL;
-      fd_screen_lock(ctx->screen);
-      fd_batch_reference_locked(&write_batch, rsc->track->write_batch);
-      fd_screen_unlock(ctx->screen);
-      if (write_batch) {
-         fd_batch_flush(write_batch);
-         fd_batch_reference(&write_batch, NULL);
-      }
+      fd_bc_flush_writer(ctx, rsc);
    }
 }