drm/msm/gem: Consolidate shrinker trace

Combine separate trace events for purge vs evict into one.  When we add
support for purging/evicting active buffers we'll just add more info
into this one trace event, rather than adding a bunch more events.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/496133/
Link: https://lore.kernel.org/r/20220802155152.1727594-13-robdclark@gmail.com

drivers/gpu/drm/msm/msm_gem_shrinker.c

@@ -71,25 +71,20 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
 	struct msm_drm_private *priv =
 		container_of(shrinker, struct msm_drm_private, shrinker);
 	long nr = sc->nr_to_scan;
-	unsigned long freed;
+	unsigned long freed, purged, evicted = 0;
 
-	freed = drm_gem_lru_scan(&priv->lru.dontneed, nr, purge);
-	nr -= freed;
-
-	if (freed > 0)
-		trace_msm_gem_purge(freed << PAGE_SHIFT);
+	purged = drm_gem_lru_scan(&priv->lru.dontneed, nr, purge);
+	nr -= purged;
 
 	if (can_swap() && nr > 0) {
-		unsigned long evicted;
-
 		evicted = drm_gem_lru_scan(&priv->lru.willneed, nr, evict);
 		nr -= evicted;
+	}
 
-		if (evicted > 0)
-			trace_msm_gem_evict(evicted << PAGE_SHIFT);
+	freed = purged + evicted;
 
-		freed += evicted;
-	}
+	if (freed)
+		trace_msm_gem_shrink(sc->nr_to_scan, purged, evicted);
 
 	return (freed > 0) ? freed : SHRINK_STOP;
 }

drivers/gpu/drm/msm/msm_gpu_trace.h

@@ -115,29 +115,23 @@ TRACE_EVENT(msm_gmu_freq_change,
 );
 
 
-TRACE_EVENT(msm_gem_purge,
-		TP_PROTO(u32 bytes),
-		TP_ARGS(bytes),
+TRACE_EVENT(msm_gem_shrink,
+		TP_PROTO(u32 nr_to_scan, u32 purged, u32 evicted),
+		TP_ARGS(nr_to_scan, purged, evicted),
 		TP_STRUCT__entry(
-			__field(u32, bytes)
+			__field(u32, nr_to_scan)
+			__field(u32, purged)
+			__field(u32, evicted)
 			),
 		TP_fast_assign(
-			__entry->bytes = bytes;
+			__entry->nr_to_scan = nr_to_scan;
+			__entry->purged = purged;
+			__entry->evicted = evicted;
 			),
-		TP_printk("Purging %u bytes", __entry->bytes)
-);
-
-
-TRACE_EVENT(msm_gem_evict,
-		TP_PROTO(u32 bytes),
-		TP_ARGS(bytes),
-		TP_STRUCT__entry(
-			__field(u32, bytes)
-			),
-		TP_fast_assign(
-			__entry->bytes = bytes;
-			),
-		TP_printk("Evicting %u bytes", __entry->bytes)
+		TP_printk("nr_to_scan=%u pages, purged=%u pages, evicted=%u pages",
+			  __entry->nr_to_scan,
+			  __entry->purged,
+			  __entry->evicted)
 );