ref_tracker: add a static classname string to each ref_tracker_dir

A later patch in the series will be adding debugfs files for each
ref_tracker that get created in ref_tracker_dir_init(). The format will
be "class@%px". The current "name" string can vary between
ref_tracker_dir objects of the same type, so it's not suitable for this
purpose.

Add a new "class" string to the ref_tracker dir that describes the
the type of object (sans any individual info for that object).

Also, in the i915 driver, gate the creation of debugfs files on whether
the dentry pointer is still set to NULL. CI has shown that the
ref_tracker_dir can be initialized more than once.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20250618-reftrack-dbgfs-v15-4-24fc37ead144@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/gpu/drm/display/drm_dp_tunnel.c b/drivers/gpu/drm/display/drm_dp_tunnel.c
index 076edf1610480275c62395334ab0536befa42f15..b9c12b8bf2a3e400b6d8e9d184145834c603b9e1 100644 (file)
--- a/drivers/gpu/drm/display/drm_dp_tunnel.c
+++ b/drivers/gpu/drm/display/drm_dp_tunnel.c
@@ -1920,7 +1920,7 @@ drm_dp_tunnel_mgr_create(struct drm_device *dev, int max_group_count)
        }
 
 #ifdef CONFIG_DRM_DISPLAY_DP_TUNNEL_STATE_DEBUG
-       ref_tracker_dir_init(&mgr->ref_tracker, 16, "dptun");
+       ref_tracker_dir_init(&mgr->ref_tracker, 16, "drm_dptun", "dptun");
 #endif
 
        for (i = 0; i < max_group_count; i++) {

diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index 8d9f4c410546e4144d4bc8bbc6696f3bd9498848..90d90145a1890bf788e789858ddad3b3d8e3b978 100644 (file)
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -59,7 +59,9 @@ static struct drm_i915_private *rpm_to_i915(struct intel_runtime_pm *rpm)
 
 static void init_intel_runtime_pm_wakeref(struct intel_runtime_pm *rpm)
 {
-       ref_tracker_dir_init(&rpm->debug, INTEL_REFTRACK_DEAD_COUNT, dev_name(rpm->kdev));
+       if (!rpm->debug.class)
+               ref_tracker_dir_init(&rpm->debug, INTEL_REFTRACK_DEAD_COUNT,
+                                    "intel_runtime_pm", dev_name(rpm->kdev));
 }
 
 static intel_wakeref_t

diff --git a/drivers/gpu/drm/i915/intel_wakeref.c b/drivers/gpu/drm/i915/intel_wakeref.c
index 51561b190b93124a82fbe0e0c961d6bfcde55538..7e74c58862c1b7e7a4790c013f8ffb61365aae5a 100644 (file)
--- a/drivers/gpu/drm/i915/intel_wakeref.c
+++ b/drivers/gpu/drm/i915/intel_wakeref.c
@@ -114,7 +114,8 @@ void __intel_wakeref_init(struct intel_wakeref *wf,
                         "wakeref.work", &key->work, 0);
 
 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_WAKEREF)
-       ref_tracker_dir_init(&wf->debug, INTEL_REFTRACK_DEAD_COUNT, name);
+       if (!wf->debug.class)
+               ref_tracker_dir_init(&wf->debug, INTEL_REFTRACK_DEAD_COUNT, "intel_wakeref", name);
 #endif
 }
 

diff --git a/include/linux/ref_tracker.h b/include/linux/ref_tracker.h
index a0a1ee43724ffa00e60c116be18e481bfe1d1455..3968f993db81e95c0d58c81454311841c1b9cd35 100644 (file)
--- a/include/linux/ref_tracker.h
+++ b/include/linux/ref_tracker.h
@@ -19,6 +19,7 @@ struct ref_tracker_dir {
        bool                    dead;
        struct list_head        list; /* List of active trackers */
        struct list_head        quarantine; /* List of dead trackers */
+       const char              *class; /* object classname */
        char                    name[32];
 #endif
 };
@@ -27,6 +28,7 @@ struct ref_tracker_dir {
 
 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
                                        unsigned int quarantine_count,
+                                       const char *class,
                                        const char *name)
 {
        INIT_LIST_HEAD(&dir->list);
@@ -36,6 +38,7 @@ static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
        dir->dead = false;
        refcount_set(&dir->untracked, 1);
        refcount_set(&dir->no_tracker, 1);
+       dir->class = class;
        strscpy(dir->name, name, sizeof(dir->name));
        stack_depot_init();
 }
@@ -60,6 +63,7 @@ int ref_tracker_free(struct ref_tracker_dir *dir,
 
 static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
                                        unsigned int quarantine_count,
+                                       const char *class,
                                        const char *name)
 {
 }

diff --git a/lib/test_ref_tracker.c b/lib/test_ref_tracker.c
index b983ceb12afcb84ad60360a1e6fec0072e78ef79..d263502a4c1db248f64a66a468e96c8e4cffab25 100644 (file)
--- a/lib/test_ref_tracker.c
+++ b/lib/test_ref_tracker.c
@@ -64,7 +64,7 @@ static int __init test_ref_tracker_init(void)
 {
        int i;
 
-       ref_tracker_dir_init(&ref_dir, 100, "selftest");
+       ref_tracker_dir_init(&ref_dir, 100, "selftest", "selftest");
 
        timer_setup(&test_ref_tracker_timer, test_ref_tracker_timer_func, 0);
        mod_timer(&test_ref_tracker_timer, jiffies + 1);

diff --git a/net/core/dev.c b/net/core/dev.c
index be97c440ecd5f993344ae08d76c0b5216c4d296a..12cf4e5ae9c5437bcfec657e37b7e08792bc14bf 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -11715,7 +11715,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
 
        dev->priv_len = sizeof_priv;
 
-       ref_tracker_dir_init(&dev->refcnt_tracker, 128, name);
+       ref_tracker_dir_init(&dev->refcnt_tracker, 128, "netdev", name);
 #ifdef CONFIG_PCPU_DEV_REFCNT
        dev->pcpu_refcnt = alloc_percpu(int);
        if (!dev->pcpu_refcnt)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index ae54f26709ca242567e5d62d7b5dcc7f6303da57..aa1e34181ed6f353921a23411fa227b612db661a 100644 (file)
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -403,8 +403,8 @@ static __net_init void preinit_net(struct net *net, struct user_namespace *user_
 {
        refcount_set(&net->passive, 1);
        refcount_set(&net->ns.count, 1);
-       ref_tracker_dir_init(&net->refcnt_tracker, 128, "net refcnt");
-       ref_tracker_dir_init(&net->notrefcnt_tracker, 128, "net notrefcnt");
+       ref_tracker_dir_init(&net->refcnt_tracker, 128, "net_refcnt", "net_refcnt");
+       ref_tracker_dir_init(&net->notrefcnt_tracker, 128, "net_notrefcnt", "net_notrefcnt");
 
        get_random_bytes(&net->hash_mix, sizeof(u32));
        net->dev_base_seq = 1;