drm/cma: add debugfs helpers

Add helper to display fb's which can be used directly in drm_info_list:

static struct drm_info_list foo_debugfs_list[] = {
		...
		{ "fb",   drm_fb_cma_debugfs_show, 0 },
};

to display information about CMA fb objects, as well as a
drm_gem_cma_describe() which can be used if the driver bothers to keep
a list of CMA GEM objects.

Signed-off-by: Rob Clark <robdclark@gmail.com>

2 files changed, 74 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c
index ef68e34b16ec..8044c5e56665 100644
--- a/drivers/gpu/drm/drm_fb_cma_helper.c
+++ b/drivers/gpu/drm/drm_fb_cma_helper.c
@@ -180,6 +180,59 @@ struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
 }
 EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
 
+#ifdef CONFIG_DEBUG_FS
+/**
+ * drm_fb_cma_describe() - Helper to dump information about a single
+ * CMA framebuffer object
+ */
+void drm_fb_cma_describe(struct drm_framebuffer *fb, struct seq_file *m)
+{
+        struct drm_fb_cma *fb_cma = to_fb_cma(fb);
+        int i, n = drm_format_num_planes(fb->pixel_format);
+
+        seq_printf(m, "fb: %dx%d@%4.4s\n", fb->width, fb->height,
+                        (char *)&fb->pixel_format);
+
+        for (i = 0; i < n; i++) {
+                seq_printf(m, "   %d: offset=%d pitch=%d, obj: ",
+                                i, fb->offsets[i], fb->pitches[i]);
+                drm_gem_cma_describe(fb_cma->obj[i], m);
+        }
+}
+EXPORT_SYMBOL_GPL(drm_fb_cma_describe);
+
+/**
+ * drm_fb_cma_debugfs_show() - Helper to list CMA framebuffer objects
+ * in debugfs.
+ */
+int drm_fb_cma_debugfs_show(struct seq_file *m, void *arg)
+{
+        struct drm_info_node *node = (struct drm_info_node *) m->private;
+        struct drm_device *dev = node->minor->dev;
+        struct drm_framebuffer *fb;
+        int ret;
+
+        ret = mutex_lock_interruptible(&dev->mode_config.mutex);
+        if (ret)
+                return ret;
+
+        ret = mutex_lock_interruptible(&dev->struct_mutex);
+        if (ret) {
+                mutex_unlock(&dev->mode_config.mutex);
+                return ret;
+        }
+
+        list_for_each_entry(fb, &dev->mode_config.fb_list, head)
+                drm_fb_cma_describe(fb, m);
+
+        mutex_unlock(&dev->struct_mutex);
+        mutex_unlock(&dev->mode_config.mutex);
+
+        return 0;
+}
+EXPORT_SYMBOL_GPL(drm_fb_cma_debugfs_show);
+#endif
+
 static struct fb_ops drm_fbdev_cma_ops = {
         .owner          = THIS_MODULE,
         .fb_fillrect    = sys_fillrect,
diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c
index 1aa8fee1e865..0a7e011509bd 100644
--- a/drivers/gpu/drm/drm_gem_cma_helper.c
+++ b/drivers/gpu/drm/drm_gem_cma_helper.c
@@ -249,3 +249,24 @@ int drm_gem_cma_dumb_destroy(struct drm_file *file_priv,
         return drm_gem_handle_delete(file_priv, handle);
 }
 EXPORT_SYMBOL_GPL(drm_gem_cma_dumb_destroy);
+
+#ifdef CONFIG_DEBUG_FS
+void drm_gem_cma_describe(struct drm_gem_cma_object *cma_obj, struct seq_file *m)
+{
+        struct drm_gem_object *obj = &cma_obj->base;
+        struct drm_device *dev = obj->dev;
+        uint64_t off = 0;
+
+        WARN_ON(!mutex_is_locked(&dev->struct_mutex));
+
+        if (obj->map_list.map)
+                off = (uint64_t)obj->map_list.hash.key;
+
+        seq_printf(m, "%2d (%2d) %08llx %08Zx %p %d",
+                        obj->name, obj->refcount.refcount.counter,
+                        off, cma_obj->paddr, cma_obj->vaddr, obj->size);
+
+        seq_printf(m, "\n");
+}
+EXPORT_SYMBOL_GPL(drm_gem_cma_describe);
+#endif