On Mon, Oct 15, 2018 at 06:28:32PM +0200, Jerome Brunet wrote:
Since commit 50d7ba36b916 ("arm64: export memblock_reserve()d regions via /proc/iomem") was merged Amlogic's boards using mainline u-boot started showing the following warning:
WARNING: CPU: 0 PID: 1 at arch/arm64/kernel/setup.c:271 reserve_memblock_reserved_regions+0xd8/0x144 Modules linked in: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.0-rc7-00263-g385684b3eb27-dirty #254 pstate: 40000005 (nZcv daif -PAN -UAO) pc : reserve_memblock_reserved_regions+0xd8/0x144 lr : reserve_memblock_reserved_regions+0xd0/0x144 [...]
This is due to u-boot setting some /reservedmem/ region while our dts declares reserved memory on the same region with no-map.
The conflict produce the warning. This is fixed by using /reservedmem/ in our dts as well, which is probably something we should have done from the beginning.
A /memreserve/ does not ensure no-map, and the kernel will map regions which are described in a memory node and only protected with a /memreserve/ entry.
Is it safe for the kernel to map these? e.g. speculative fetches won't trigger a TrustZone controller to reboot the system?
... or are they not in memory nodes to begin with?
Thanks, Mark.
Cc: stable@vger.kernel.org Cc: Neil Armstrong narmstrong@baylibre.com Signed-off-by: Jerome Brunet jbrunet@baylibre.com
Hi Kevin,
I would have liked to put a Fixes tag above but I could not figure out which commit to pick, considering how much we changed those regions in the past. If you have suggestion, I'll be happy to repost this patch. If you prefer, feel free to amend this patch directly.
Cheers Jerome
arch/arm64/boot/dts/amlogic/meson-axg.dtsi | 24 +++++-------------- arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 27 ++++++++-------------- 2 files changed, 15 insertions(+), 36 deletions(-)
diff --git a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi index 178d8e8c56b8..06a06f11f114 100644 --- a/arch/arm64/boot/dts/amlogic/meson-axg.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-axg.dtsi @@ -13,6 +13,12 @@ #include <dt-bindings/reset/amlogic,meson-axg-audio-arb.h> #include <dt-bindings/reset/amlogic,meson-axg-reset.h>
+/* 16 MiB reserved for Hardware ROM Firmware */ +/memreserve/ 0x0 0x1000000;
+/* 3 MiB reserved for ARM Trusted Firmware (BL31) */ +/memreserve/ 0x05000000 0x300000;
/ { compatible = "amlogic,meson-axg";
@@ -115,24 +121,6 @@ method = "smc"; };
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;};/* Alternate 3 MiB reserved for ARM Trusted Firmware (BL31) */secmon_reserved: secmon@5000000 {reg = <0x0 0x05000000 0x0 0x300000>;no-map;};};soc { compatible = "simple-bus"; #address-cells = <2>;diff --git a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi index 676a995fb912..23e879b29b1e 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gx.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-gx.dtsi @@ -13,6 +13,15 @@ #include <dt-bindings/interrupt-controller/irq.h> #include <dt-bindings/interrupt-controller/arm-gic.h>
+/* 16 MiB reserved for Hardware ROM Firmware */ +/memreserve/ 0x0 0x1000000;
+/* 2 MiB reserved for ARM Trusted Firmware (BL31) */ +/memreserve/ 0x10000000 0x200000;
+/* Alternate 3 MiB reserved for ARM Trusted Firmware (BL31) */ +/memreserve/ 0x05000000 0x300000;
/ { interrupt-parent = <&gic>; #address-cells = <2>; @@ -23,24 +32,6 @@ #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;};/* Alternate 3 MiB reserved for ARM Trusted Firmware (BL31) */secmon_reserved_alt: secmon@5000000 {reg = <0x0 0x05000000 0x0 0x300000>;no-map;};linux,cma { compatible = "shared-dma-pool"; reusable;-- 2.17.2
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