drm/msm: Improved debugfs gem stats

The last patch lost the breakdown of active vs inactive GEM objects in
$debugfs/gem.  But we can add some better stats to summarize not just
active vs inactive, but also purgable/purged to make up for that.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20210401012722.527712-5-robdclark@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_fb.c

@@ -33,6 +33,7 @@ static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
 #ifdef CONFIG_DEBUG_FS
 void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 {
+	struct msm_gem_stats stats = {};
 	int i, n = fb->format->num_planes;
 
 	seq_printf(m, "fb: %dx%d@%4.4s (%2d, ID:%d)\n",
@@ -42,7 +43,7 @@ void msm_framebuffer_describe(struct drm_framebuffer *fb, struct seq_file *m)
 	for (i = 0; i < n; i++) {
 		seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
 				i, fb->offsets[i], fb->pitches[i]);
-		msm_gem_describe(fb->obj[i], m);
+		msm_gem_describe(fb->obj[i], m, &stats);
 	}
 }
 #endif

drivers/gpu/drm/msm/msm_gem.c

@@ -873,7 +873,8 @@ static void describe_fence(struct dma_fence *fence, const char *type,
 				fence->seqno);
 }
 
-void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
+void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
+		struct msm_gem_stats *stats)
 {
 	struct msm_gem_object *msm_obj = to_msm_bo(obj);
 	struct dma_resv *robj = obj->resv;
@@ -885,11 +886,23 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 
 	msm_gem_lock(obj);
 
+	stats->all.count++;
+	stats->all.size += obj->size;
+
+	if (is_active(msm_obj)) {
+		stats->active.count++;
+		stats->active.size += obj->size;
+	}
+
 	switch (msm_obj->madv) {
 	case __MSM_MADV_PURGED:
+		stats->purged.count++;
+		stats->purged.size += obj->size;
 		madv = " purged";
 		break;
 	case MSM_MADV_DONTNEED:
+		stats->purgable.count++;
+		stats->purgable.size += obj->size;
 		madv = " purgeable";
 		break;
 	case MSM_MADV_WILLNEED:
@@ -956,20 +969,24 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
 
 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 {
+	struct msm_gem_stats stats = {};
 	struct msm_gem_object *msm_obj;
-	int count = 0;
-	size_t size = 0;
 
 	seq_puts(m, "   flags       id ref  offset   kaddr            size     madv      name\n");
 	list_for_each_entry(msm_obj, list, node) {
 		struct drm_gem_object *obj = &msm_obj->base;
 		seq_puts(m, "   ");
-		msm_gem_describe(obj, m);
-		count++;
-		size += obj->size;
+		msm_gem_describe(obj, m, &stats);
 	}
 
-	seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
+	seq_printf(m, "Total:    %4d objects, %9zu bytes\n",
+			stats.all.count, stats.all.size);
+	seq_printf(m, "Active:   %4d objects, %9zu bytes\n",
+			stats.active.count, stats.active.size);
+	seq_printf(m, "Purgable: %4d objects, %9zu bytes\n",
+			stats.purgable.count, stats.purgable.size);
+	seq_printf(m, "Purged:   %4d objects, %9zu bytes\n",
+			stats.purged.count, stats.purged.size);
 }
 #endif
 

drivers/gpu/drm/msm/msm_gem.h

@@ -158,7 +158,16 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 __printf(2, 3)
 void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...);
 #ifdef CONFIG_DEBUG_FS
-void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m);
+
+struct msm_gem_stats {
+	struct {
+		unsigned count;
+		size_t size;
+	} all, active, purgable, purged;
+};
+
+void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
+		struct msm_gem_stats *stats);
 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m);
 #endif