linux-kernel - [PATCH v5 5/6] drm/log: Implement suspend/resume

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241023121145.1321921-6-jfalempe@redhat.com>
Date: Wed, 23 Oct 2024 14:00:13 +0200
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	John Ogness <john.ogness@...utronix.de>,
	Javier Martinez Canillas <javierm@...hat.com>,
	"Guilherme G . Piccoli" <gpiccoli@...lia.com>,
	bluescreen_avenger@...izon.net,
	Caleb Connolly <caleb.connolly@...aro.org>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: [PATCH v5 5/6] drm/log: Implement suspend/resume

The console is already suspended in printk.c.
Just make sure we don't write to the framebuffer while the graphic
driver is suspended.
It may lose a few messages between graphic suspend and console
suspend.

Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
---
 drivers/gpu/drm/drm_log.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/drm_log.c b/drivers/gpu/drm/drm_log.c
index 635dff7b37ce5..07d1513001468 100644
--- a/drivers/gpu/drm/drm_log.c
+++ b/drivers/gpu/drm/drm_log.c
@@ -50,6 +50,7 @@ struct drm_log {
 	struct drm_client_dev client;
 	struct console con;
 	bool probed;
+	bool suspended;
 	u32 n_scanout;
 	struct drm_log_scanout *scanout;
 };
@@ -310,10 +311,32 @@ static int drm_log_client_hotplug(struct drm_client_dev *client)
 	return 0;
 }
 
+static int drm_log_client_suspend(struct drm_client_dev *client, bool _console_lock)
+{
+	struct drm_log *dlog = client_to_drm_log(client);
+
+	mutex_lock(&dlog->lock);
+	dlog->suspended = true;
+	mutex_unlock(&dlog->lock);
+	return 0;
+}
+
+static int drm_log_client_resume(struct drm_client_dev *client, bool _console_lock)
+{
+	struct drm_log *dlog = client_to_drm_log(client);
+
+	mutex_lock(&dlog->lock);
+	dlog->suspended = false;
+	mutex_unlock(&dlog->lock);
+	return 0;
+}
+
 static const struct drm_client_funcs drm_log_client_funcs = {
 	.owner		= THIS_MODULE,
 	.unregister	= drm_log_client_unregister,
 	.hotplug	= drm_log_client_hotplug,
+	.suspend	= drm_log_client_suspend,
+	.resume		= drm_log_client_resume,
 };
 
 static void drm_log_write_thread(struct console *con, struct nbcon_write_context *wctxt)
@@ -321,6 +344,9 @@ static void drm_log_write_thread(struct console *con, struct nbcon_write_context
 	struct drm_log *dlog = console_to_drm_log(con);
 	int i;
 
+	if (dlog->suspended)
+		return;
+
 	if (!dlog->probed)
 		drm_log_init_client(dlog);
 
-- 
2.47.0