ARM64: dts: meson-gx: Add firmware reserved memory zones

The Amlogic Meson GXBB/GXL/GXM secure monitor uses part of the memory space,
this patch adds these reserved zones.

Without such reserved memory zones, running the following stress command :
$ stress-ng --vm 16 --vm-bytes 128M --timeout 10s
multiple times:

Could lead to the following kernel crashes :
[   46.937975] Bad mode in Error handler detected on CPU1, code 0xbf000000 -- SError
...
[   47.058536] Internal error: Attempting to execute userspace memory: 8600000f [#3] PREEMPT SMP
...
Instead of the OOM killer.

Fixes: 4f24eda8401f ("ARM64: dts: Prepare configs for Amlogic Meson GXBaby")
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
[khilman: added Fixes tag, added _reserved and unit addresses]
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[bwh: Backported to 4.9: adjust filename]

Gbp-Pq: Topic features/arm64
Gbp-Pq: Name dts-meson-gx-add-firmware-reserved-memory-zone.patch

diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
index 610e0e1c3cee664aca2f5408a5d19ddb3466f1d3..2703eeaa97b536c89f31b34a521ad7badf770778 100644 (file)
--- a/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
+++ b/arch/arm64/boot/dts/amlogic/meson-gxbb.dtsi
@@ -55,6 +55,24 @@
        #address-cells = <2>;
        #size-cells = <2>;
 
+       reserved-memory {
+               #address-cells = <2>;
+               #size-cells = <2>;
+               ranges;
+
+               /* 16 MiB reserved for Hardware ROM Firmware */
+               hwrom_reserved: hwrom@0 {
+                       reg = <0x0 0x0 0x0 0x1000000>;
+                       no-map;
+               };
+
+               /* 2 MiB reserved for ARM Trusted Firmware (BL31) */
+               secmon_reserved: secmon@10000000 {
+                       reg = <0x0 0x10000000 0x0 0x200000>;
+                       no-map;
+               };
+       };
+
        cpus {
                #address-cells = <0x2>;
                #size-cells = <0x0>;