drm/i915: Replace custom intel runtime_pm tracker with ref_tracker library

Beside reusing existing code, the main advantage of ref_tracker is
tracking per instance of wakeref. It allows also to catch double
put.
On the other side we lose information about the first acquire and
the last release, but the advantages outweigh it.

Signed-off-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231030-ref_tracker_i915-v1-1-006fe6b96421@intel.com

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_wakeref.c b/drivers/gpu/drm/i915/intel_wakeref.c
index 623a69089386..2401b88b55a4 100644
--- a/drivers/gpu/drm/i915/intel_wakeref.c
+++ b/drivers/gpu/drm/i915/intel_wakeref.c
@@ -191,3 +191,31 @@ void intel_wakeref_auto_fini(struct intel_wakeref_auto *wf)
 	intel_wakeref_auto(wf, 0);
 	INTEL_WAKEREF_BUG_ON(wf->wakeref);
 }
+
+void intel_ref_tracker_show(struct ref_tracker_dir *dir,
+			    struct drm_printer *p)
+{
+	const size_t buf_size = PAGE_SIZE;
+	char *buf, *sb, *se;
+	size_t count;
+
+	buf = kmalloc(buf_size, GFP_NOWAIT);
+	if (!buf)
+		return;
+
+	count = ref_tracker_dir_snprint(dir, buf, buf_size);
+	if (!count)
+		goto free;
+	/* printk does not like big buffers, so we split it */
+	for (sb = buf; *sb; sb = se + 1) {
+		se = strchrnul(sb, '\n');
+		drm_printf(p, "%.*s", (int)(se - sb + 1), sb);
+		if (!*se)
+			break;
+	}
+	if (count >= buf_size)
+		drm_printf(p, "\n...dropped %zd extra bytes of leak report.\n",
+			   count + 1 - buf_size);
+free:
+	kfree(buf);
+}