From nobody Mon Feb 9 09:32:50 2026 Received: from relay5-d.mail.gandi.net (relay5-d.mail.gandi.net [217.70.183.197]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0C9A8218591 for ; Wed, 26 Feb 2025 21:24:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.183.197 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740605098; cv=none; b=kYdyH3H22QGkWsu/I5j4MYXg/HXS/9cwKlOt3p4pB5BnkQtYWQQG7xDE/BvTYIuIjHSxS/8+0Y4g36SHLbSh9oBQESRrNEtzOJrPOOVnQFko+uT5maiVZ2EP7jLHZgqQmMugfo2GZS6cYObn5Tu0qT0SGx3W6jjxWy0PyCL4G1E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1740605098; c=relaxed/simple; bh=GPvtEcspJU6GxP83VqwaJwmNYNNs6KoVA1yAU/7fUWY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BqkfwiDu7au8d3Qv+YDXAsUhl9Ebqq9FdjulNBmEYYtSfQUDBebRbu34RDFBY7AFu9Rk8Zl6XPWiDWgeLOFU0wuuWjFPvpGlAc/RpE6PAw6tHBGmsChx7Ff72Z15KePRcFTvEU01cEDv48EOq+g7CwYCR3FzpHRkdOB/X7LiP/s= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=ikf0by6P; arc=none smtp.client-ip=217.70.183.197 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="ikf0by6P" Received: by mail.gandi.net (Postfix) with ESMTPSA id EAF6C4435B; Wed, 26 Feb 2025 21:24:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1740605094; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RjXIFbrycUalHpcnR/F5qePySLzaC2KIyI6Go0Y3H6o=; b=ikf0by6PP6wDzBzH4f1AW/7i/C50BiqT4SRCVXjtBq8jUBcsVS9BqRMC/ofjH0KTQiqIzR H0RueAaGHUHfIErOLGlCgP6uXHEhjX+2YhxbOTWqyaF2sIqaa7MXullaZFsiwz6pt8iFII ICoEC6T3Cw5nxBTW9AQl6sJT4Bw9PrH+CpK3saQqljwg+K7PELliMqLIEYl/1GHOi9vCvE sn0GJxmAiFfzOUwy5VCZITyTyiFCZkmPT6s6PYmyZ19qirlXaHncsHl3naVH/UfV4Jcy55 gNqwDwifbgXjFk9kHk2GTgHVfgoyqfgOsZYdJabdGx+Gmq7EnTirFIEY8gMAGw== From: Luca Ceresoli Date: Wed, 26 Feb 2025 22:23:53 +0100 Subject: [PATCH v8 2/2] drm/debugfs: add top-level 'bridges' file showing all added bridges Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250226-drm-debugfs-show-all-bridges-v8-2-bb511cc49d83@bootlin.com> References: <20250226-drm-debugfs-show-all-bridges-v8-0-bb511cc49d83@bootlin.com> In-Reply-To: <20250226-drm-debugfs-show-all-bridges-v8-0-bb511cc49d83@bootlin.com> To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: Jani Nikula , Dmitry Baryshkov , Thomas Petazzoni , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Luca Ceresoli X-Mailer: b4 0.14.2 X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdekheeihecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhephfffufggtgfgkfhfjgfvvefosehtjeertdertdejnecuhfhrohhmpefnuhgtrgcuvegvrhgvshholhhiuceolhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepieeiuedvffetgfeuudelheeutefggfejieettdetteekueeuueeukeevvedvueevnecukfhppedvrgdtvdemieejtdemvddtvddtmegvrgdtudemsggvgedumeelhegvjeemfeegfeemledufegvnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepvdgrtddvmeeijedtmedvtddvtdemvggrtddumegsvgegudemleehvgejmeefgeefmeeludefvgdphhgvlhhopegludelvddrudeikedrudejkedruddukegnpdhmrghilhhfrhhomheplhhutggrrdgtvghrvghsohhlihessghoohhtlhhinhdrtghomhdpnhgspghrtghpthhtohepudejpdhrtghpthhtohepshhimhhonhgrsehffhiflhhlrdgthhdprhgtphhtthhopehjohhnrghssehkfihisghoohdrshgvpdhrtghpthhtohepmhgrrghrthgvnhdrlhgrnhhkhhhorhhstheslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhop ehtiihimhhmvghrmhgrnhhnsehsuhhsvgdruggvpdhrtghpthhtohepjhgrnhhirdhnihhkuhhlrgeslhhinhhugidrihhnthgvlhdrtghomhdprhgtphhtthhopegrihhrlhhivggusehgmhgrihhlrdgtohhmpdhrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhgpdhrtghpthhtoheprghnughriigvjhdrhhgrjhgurgesihhnthgvlhdrtghomh X-GND-Sasl: luca.ceresoli@bootlin.com The global bridges_list holding all the bridges between drm_bridge_add() and drm_bridge_remove() cannot be inspected via debugfs. Add a file showing it. To avoid code duplication, move the code printing a bridge info to a common function. Signed-off-by: Luca Ceresoli Reviewed-by: Jani Nikula --- Changed in v8: - add the file in drm_bridge.c, which avois the added #if CONFIG_DEBUG_FS - fix incorrect (but harmless) idx increment in drm_bridge_debugfs_show_bridge() Changed in v7: - move implementation to drm_bridge.c to avoid exporting bridge_list and bridge_mutex This patch was added in v6. --- drivers/gpu/drm/drm_bridge.c | 72 ++++++++++++++++++++++++++++++----------= ---- drivers/gpu/drm/drm_drv.c | 2 ++ include/drm/drm_bridge.h | 1 + 3 files changed, 53 insertions(+), 22 deletions(-) diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index a6bf1a565e3c3a8d24de60448972849f6d86ba72..9c6e35d41ed54a14d5745e684a3= 41c907ed84d6b 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -1336,6 +1336,49 @@ struct drm_bridge *of_drm_find_bridge(struct device_= node *np) EXPORT_SYMBOL(of_drm_find_bridge); #endif =20 +static void drm_bridge_debugfs_show_bridge(struct drm_printer *p, + struct drm_bridge *bridge, + unsigned int idx) +{ + drm_printf(p, "bridge[%u]: %ps\n", idx, bridge->funcs); + drm_printf(p, "\ttype: [%d] %s\n", + bridge->type, + drm_get_connector_type_name(bridge->type)); + + if (bridge->of_node) + drm_printf(p, "\tOF: %pOFfc\n", bridge->of_node); + + drm_printf(p, "\tops: [0x%x]", bridge->ops); + if (bridge->ops & DRM_BRIDGE_OP_DETECT) + drm_puts(p, " detect"); + if (bridge->ops & DRM_BRIDGE_OP_EDID) + drm_puts(p, " edid"); + if (bridge->ops & DRM_BRIDGE_OP_HPD) + drm_puts(p, " hpd"); + if (bridge->ops & DRM_BRIDGE_OP_MODES) + drm_puts(p, " modes"); + if (bridge->ops & DRM_BRIDGE_OP_HDMI) + drm_puts(p, " hdmi"); + drm_puts(p, "\n"); +} + +static int allbridges_show(struct seq_file *m, void *data) +{ + struct drm_printer p =3D drm_seq_file_printer(m); + struct drm_bridge *bridge; + unsigned int idx =3D 0; + + mutex_lock(&bridge_lock); + + list_for_each_entry(bridge, &bridge_list, list) + drm_bridge_debugfs_show_bridge(&p, bridge, idx++); + + mutex_unlock(&bridge_lock); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(allbridges); + static int encoder_bridges_show(struct seq_file *m, void *data) { struct drm_encoder *encoder =3D m->private; @@ -1343,33 +1386,18 @@ static int encoder_bridges_show(struct seq_file *m,= void *data) struct drm_bridge *bridge; unsigned int idx =3D 0; =20 - drm_for_each_bridge_in_chain(encoder, bridge) { - drm_printf(&p, "bridge[%u]: %ps\n", idx++, bridge->funcs); - drm_printf(&p, "\ttype: [%d] %s\n", - bridge->type, - drm_get_connector_type_name(bridge->type)); - - if (bridge->of_node) - drm_printf(&p, "\tOF: %pOFfc\n", bridge->of_node); - - drm_printf(&p, "\tops: [0x%x]", bridge->ops); - if (bridge->ops & DRM_BRIDGE_OP_DETECT) - drm_puts(&p, " detect"); - if (bridge->ops & DRM_BRIDGE_OP_EDID) - drm_puts(&p, " edid"); - if (bridge->ops & DRM_BRIDGE_OP_HPD) - drm_puts(&p, " hpd"); - if (bridge->ops & DRM_BRIDGE_OP_MODES) - drm_puts(&p, " modes"); - if (bridge->ops & DRM_BRIDGE_OP_HDMI) - drm_puts(&p, " hdmi"); - drm_puts(&p, "\n"); - } + drm_for_each_bridge_in_chain(encoder, bridge) + drm_bridge_debugfs_show_bridge(&p, bridge, idx++); =20 return 0; } DEFINE_SHOW_ATTRIBUTE(encoder_bridges); =20 +void drm_bridge_debugfs_params(struct dentry *root) +{ + debugfs_create_file("bridges", 0444, root, NULL, &allbridges_fops); +} + void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_encoder *encoder) { diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 3cf440eee8a2ab3de134d925db8f1d2ce68062b7..22e8cd0a6a37a0ac25535e9d570= da25571b0b2bc 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -38,6 +38,7 @@ #include =20 #include +#include #include #include #include @@ -1120,6 +1121,7 @@ static int __init drm_core_init(void) } =20 drm_debugfs_root =3D debugfs_create_dir("dri", NULL); + drm_bridge_debugfs_params(drm_debugfs_root); =20 ret =3D register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); if (ret < 0) diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h index 0890acfe04b99b1ccbbff10b507cb8c2b2705e06..2a99d70865571f24db0ca75c758= cfd09d3a5d459 100644 --- a/include/drm/drm_bridge.h +++ b/include/drm/drm_bridge.h @@ -1108,6 +1108,7 @@ static inline struct drm_bridge *drmm_of_get_bridge(s= truct drm_device *drm, } #endif =20 +void drm_bridge_debugfs_params(struct dentry *root); void drm_bridge_debugfs_encoder_params(struct dentry *root, struct drm_enc= oder *encoder); =20 #endif --=20 2.48.1