drm/msm: Add $debugfs/gem stats on resident objects

Currently nearly everything, other than newly allocated objects which
are not yet backed by pages, is pinned and resident in RAM.  But it will
be nice to have some stats on what is unpinned once that is supported.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Link: https://lore.kernel.org/r/20210405174532.1441497-6-robdclark@gmail.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_gem.c

@@ -902,6 +902,11 @@ void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,
 		stats->active.size += obj->size;
 	}
 
+	if (msm_obj->pages) {
+		stats->resident.count++;
+		stats->resident.size += obj->size;
+	}
+
 	switch (msm_obj->madv) {
 	case __MSM_MADV_PURGED:
 		stats->purged.count++;
@@ -991,6 +996,8 @@ void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
 			stats.all.count, stats.all.size);
 	seq_printf(m, "Active:    %4d objects, %9zu bytes\n",
 			stats.active.count, stats.active.size);
+	seq_printf(m, "Resident:  %4d objects, %9zu bytes\n",
+			stats.resident.count, stats.resident.size);
 	seq_printf(m, "Purgeable: %4d objects, %9zu bytes\n",
 			stats.purgeable.count, stats.purgeable.size);
 	seq_printf(m, "Purged:    %4d objects, %9zu bytes\n",

drivers/gpu/drm/msm/msm_gem.h

@@ -162,13 +162,13 @@ struct drm_gem_object *msm_gem_import(struct drm_device *dev,
 		struct dma_buf *dmabuf, struct sg_table *sgt);
 __printf(2, 3)
 void msm_gem_object_set_name(struct drm_gem_object *bo, const char *fmt, ...);
-#ifdef CONFIG_DEBUG_FS
 
+#ifdef CONFIG_DEBUG_FS
 struct msm_gem_stats {
 	struct {
 		unsigned count;
 		size_t size;
-	} all, active, purgeable, purged;
+	} all, active, resident, purgeable, purged;
 };
 
 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m,