linux-kernel - [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t

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-next>] [day] [month] [year] [list]

Message-Id: <1446499360-31984-1-git-send-email-ville.syrjala@linux.intel.com>
Date:	Mon,  2 Nov 2015 23:22:40 +0200
From:	ville.syrjala@...ux.intel.com
To:	Len Brown <len.brown@...el.com>
Cc:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ville Syrjälä 
	<ville.syrjala@...ux.intel.com>
Subject: [PATCH] intel_idle: Don't use on Lenovo Ideapad S10-3t

From: Ville Syrjälä <ville.syrjala@...ux.intel.com>

Lenovo Ideapad S10-3t hangs coming out of S3 with intel_idle.
The two workaround that seem to help are "intel_idle.max_cstate=0"
or "nohz=off highres=off".

At a first glance quirk_tigerpoint_bm_sts() seemed promising, but
even when moved to early_resume it didn't do anything.

I have no idea what's wrong here, so let's just disable intel_idle
for these machines using a DMI match.

Cc: Len Brown <len.brown@...el.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Cc: linux-pm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Ville Syrjälä <ville.syrjala@...ux.intel.com>
---
If anyone has any better ideas, I can try out some patches.

 drivers/idle/intel_idle.c | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index cd4510a..c4a6888 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -61,6 +61,7 @@
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/module.h>
+#include <linux/dmi.h>
 #include <asm/cpu_device_id.h>
 #include <asm/mwait.h>
 #include <asm/msr.h>
@@ -925,6 +926,25 @@ static const struct x86_cpu_id intel_idle_ids[] __initconst = {
 };
 MODULE_DEVICE_TABLE(x86cpu, intel_idle_ids);
 
+static int intel_idle_disable_callback(const struct dmi_system_id *id)
+{
+	pr_debug(PREFIX "problematic system (%s), disabling\n", id->ident);
+	return 1;
+}
+
+static const struct dmi_system_id intel_idle_disable_dmi[] = {
+	{
+		/* Lenovo Ideapad S10-3t, hangs coming out of S3 */
+		.callback = intel_idle_disable_callback,
+		.ident = "Lenovo Ideapad S10-3t",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo Ideapad S10-3t"),
+		},
+	},
+	{}
+};
+
 /*
  * intel_idle_probe()
  */
@@ -957,6 +977,9 @@ static int __init intel_idle_probe(void)
 	    !mwait_substates)
 			return -ENODEV;
 
+	if (dmi_check_system(intel_idle_disable_dmi))
+		return -ENODEV;
+
 	pr_debug(PREFIX "MWAIT substates: 0x%x\n", mwait_substates);
 
 	icpu = (const struct idle_cpu *)id->driver_data;
-- 
2.4.10

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/