Thread (2 messages) flat view 2 messages, 2 authors, 2017-10-02

[PATCH] ARM: dts: meson8b: add reserved memory zone to fix silent freezes

From: martin.blumenstingl@googlemail.com (Martin Blumenstingl)
Date: 2017-10-02 18:39:53
Also in: linux-amlogic, linux-devicetree, lkml

On Mon, Oct 2, 2017 at 5:59 PM, Linus L?ssing [off-list ref] wrote:
So far, the stress-ng tool for instance quickly resulted in a silent
freeze of the system with no prior notice on a serial console when
running its filesystem or memory stressor classes.

Even with a panic-on-OOM and reboot-on-panic (vm.panic_on_oom=1,
kernel.panic=10) configured, the system would neither reboot nor
would the OOM killer get any chance to otherwise do its job.

The Amlogic reference source code uses a 2MB PHYS_OFFSET. With these 2MB
reserved via DT, stress-ng was able to run on an Odroid C1+ just fine for
several hours, the OOM killer was able to kill processes again and if
configured would successfully trigger a reboot of the system.

Fixes: 4a69fcd3a108 ("ARM: meson: Add DTS for Odroid-C1 and Tronfy MXQ boards")
Signed-off-by: Linus L?ssing <redacted>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
quoted hunk ↗ jump to hunk
---
The following stress-ng command worked fine now:
$ stress-ng -v --sequential 0 -t 120s --exclude sysfs,opcode --metrics
(5 hours runtime, tested on an Odroid C1+ with an 4.14-rc1 kernel + SMP
+ USB DTS patches)
---
 arch/arm/boot/dts/meson8b.dtsi | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
index bc278da..d75a5b5 100644
--- a/arch/arm/boot/dts/meson8b.dtsi
+++ b/arch/arm/boot/dts/meson8b.dtsi
@@ -83,6 +83,18 @@
                };
        };

+       reserved-memory {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               /* 2 MiB reserved for Hardware ROM Firmware? */
+               hwrom at 0 {
+                       reg = <0x0 0x200000>;
+                       no-map;
+               };
+       };
+
        scu at c4300000 {
                compatible = "arm,cortex-a5-scu";
                reg = <0xc4300000 0x100>;
--
2.1.4
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