asahi: Implement perf_debug

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19811>

src/asahi/lib/agx_device.h

@@ -39,6 +39,7 @@ enum agx_dbg {
    AGX_DBG_NO16  = BITFIELD_BIT(2),
    AGX_DBG_DIRTY  = BITFIELD_BIT(3),
    AGX_DBG_PRECOMPILE  = BITFIELD_BIT(4),
+   AGX_DBG_PERF  = BITFIELD_BIT(5),
 };
 
 struct agx_device {

src/gallium/drivers/asahi/agx_batch.c

@@ -12,8 +12,10 @@ agx_flush_readers(struct agx_context *ctx, struct agx_resource *rsrc, const char
    if (ctx->batch) {
       struct agx_batch *batch = ctx->batch;
 
-      if (agx_batch_uses_bo(batch, rsrc->bo))
+      if (agx_batch_uses_bo(batch, rsrc->bo)) {
+         perf_debug_ctx(ctx, "Flush reader due to: %s\n", reason);
          agx_flush_batch(ctx, batch);
+      }
    }
 }
 
@@ -22,8 +24,10 @@ agx_flush_writer(struct agx_context *ctx, struct agx_resource *rsrc, const char
 {
    struct hash_entry *ent = _mesa_hash_table_search(ctx->writer, rsrc);
 
-   if (ent)
+   if (ent) {
+      perf_debug_ctx(ctx, "Flush writer due to: %s\n", reason);
       agx_flush_batch(ctx, ent->data);
+   }
 }
 
 void

src/gallium/drivers/asahi/agx_pipe.c

@@ -71,6 +71,7 @@ static const struct debug_named_value agx_debug_options[] = {
    {"trace",     AGX_DBG_TRACE,    "Trace the command stream"},
    {"deqp",      AGX_DBG_DEQP,     "Hacks for dEQP"},
    {"no16",      AGX_DBG_NO16,     "Disable 16-bit support"},
+   {"perf",      AGX_DBG_PERF,     "Print performance warnings"},
 #ifndef NDEBUG
    {"dirty",     AGX_DBG_DIRTY,    "Disable dirty tracking"},
 #endif

src/gallium/drivers/asahi/agx_state.h

@@ -272,6 +272,15 @@ agx_device(struct pipe_screen *p)
    return &(agx_screen(p)->dev);
 }
 
+#define perf_debug(dev, ...) \
+        do { \
+                if (unlikely((dev)->debug & AGX_DBG_PERF)) \
+                        mesa_logw(__VA_ARGS__); \
+        } while(0)
+
+#define perf_debug_ctx(ctx, ...) \
+        perf_debug(agx_device((ctx)->base.screen), __VA_ARGS__);
+
 struct agx_resource {
    struct pipe_resource	base;
    uint64_t modifier;
@@ -420,7 +429,7 @@ void agx_internal_shaders(struct agx_device *dev);
 static void
 agx_flush_all(struct agx_context *ctx, const char *reason)
 {
-   //printf("Flushing due to: %s\n", reason);
+   perf_debug_ctx(ctx, "Flushing due to: %s\n", reason);
    ctx->base.flush(&ctx->base, NULL, 0);
 }