GICD region was overlapping with GICR causing the latter to not map
successfully, and in turn the gic-v3 driver would fail to initialize.
This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
replaced of_iomap() calls with of_io_request_and_map() that internally
called request_mem_region().
Respective console output before this patchset:
[ 0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
Cc: Marc Zyngier <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Nishanth Menon <[email protected]>
Signed-off-by: Matt Ranostay <[email protected]>
---
arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
index be7f39299894..19966f72c5b3 100644
--- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
@@ -33,7 +33,7 @@ gic500: interrupt-controller@1800000 {
ranges;
#interrupt-cells = <3>;
interrupt-controller;
- reg = <0x00 0x01800000 0x00 0x200000>, /* GICD */
+ reg = <0x00 0x01800000 0x00 0x100000>, /* GICD */
<0x00 0x01900000 0x00 0x100000>, /* GICR */
<0x00 0x6f000000 0x00 0x2000>, /* GICC */
<0x00 0x6f010000 0x00 0x1000>, /* GICH */
--
2.36.1
On 2022-06-16 11:51, Matt Ranostay wrote:
> GICD region was overlapping with GICR causing the latter to not map
> successfully, and in turn the gic-v3 driver would fail to initialize.
>
> This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
> replaced of_iomap() calls with of_io_request_and_map() that internally
> called request_mem_region().
>
> Respective console output before this patchset:
>
> [ 0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
Oh, it's nice that this finds bugs, but it seems I hadn't fully
considered that making the simple easy change in the DT paths results in
different behaviour from ACPI.
Marc, would you like a fix for this to remain non-fatal even in the face
of a dodgy DT, or are you happy with being a bit stricter now?
Thanks,
Robin.
> Cc: Marc Zyngier <[email protected]>
> Cc: Robin Murphy <[email protected]>
> Cc: Nishanth Menon <[email protected]>
> Signed-off-by: Matt Ranostay <[email protected]>
> ---
> arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> index be7f39299894..19966f72c5b3 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> @@ -33,7 +33,7 @@ gic500: interrupt-controller@1800000 {
> ranges;
> #interrupt-cells = <3>;
> interrupt-controller;
> - reg = <0x00 0x01800000 0x00 0x200000>, /* GICD */
> + reg = <0x00 0x01800000 0x00 0x100000>, /* GICD */
> <0x00 0x01900000 0x00 0x100000>, /* GICR */
> <0x00 0x6f000000 0x00 0x2000>, /* GICC */
> <0x00 0x6f010000 0x00 0x1000>, /* GICH */
On Thu, 16 Jun 2022 13:07:23 +0100,
Robin Murphy <[email protected]> wrote:
>
> On 2022-06-16 11:51, Matt Ranostay wrote:
> > GICD region was overlapping with GICR causing the latter to not map
> > successfully, and in turn the gic-v3 driver would fail to initialize.
> >
> > This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
> > replaced of_iomap() calls with of_io_request_and_map() that internally
> > called request_mem_region().
> >
> > Respective console output before this patchset:
> >
> > [ 0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
>
> Oh, it's nice that this finds bugs, but it seems I hadn't fully
> considered that making the simple easy change in the DT paths results
> in different behaviour from ACPI.
>
> Marc, would you like a fix for this to remain non-fatal even in the
> face of a dodgy DT, or are you happy with being a bit stricter now?
I'd rather we work around it. I shout at people for breaking existing
DTs, so this should apply to the GIC as well. A nice WARN_ON_ONCE()
should do, if you don't mind writing the patch.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
On 2022-06-16 13:13, Marc Zyngier wrote:
> On Thu, 16 Jun 2022 13:07:23 +0100,
> Robin Murphy <[email protected]> wrote:
>>
>> On 2022-06-16 11:51, Matt Ranostay wrote:
>>> GICD region was overlapping with GICR causing the latter to not map
>>> successfully, and in turn the gic-v3 driver would fail to initialize.
>>>
>>> This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
>>> replaced of_iomap() calls with of_io_request_and_map() that internally
>>> called request_mem_region().
>>>
>>> Respective console output before this patchset:
>>>
>>> [ 0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
>>
>> Oh, it's nice that this finds bugs, but it seems I hadn't fully
>> considered that making the simple easy change in the DT paths results
>> in different behaviour from ACPI.
>>
>> Marc, would you like a fix for this to remain non-fatal even in the
>> face of a dodgy DT, or are you happy with being a bit stricter now?
>
> I'd rather we work around it. I shout at people for breaking existing
> DTs, so this should apply to the GIC as well. A nice WARN_ON_ONCE()
> should do, if you don't mind writing the patch.
Indeed, I think that would be my default preference as well - apologies
for the oversight! I'll spin the patch shortly (and make the warning
consistent for the ACPI side too).
Cheers,
Robin.
Matt,
please cc linux-arm-kernel mailing list as well
On 03:51-20220616, Matt Ranostay wrote:
> GICD region was overlapping with GICR causing the latter to not map
> successfully, and in turn the gic-v3 driver would fail to initialize.
>
> This issue was hidden till commit 2b2cd74a06c3 ("irqchip/gic-v3: Claim iomem resources")
> replaced of_iomap() calls with of_io_request_and_map() that internally
> called request_mem_region().
>
> Respective console output before this patchset:
>
> [ 0.000000] GICv3: /bus@100000/interrupt-controller@1800000: couldn't map region 0
>
> Cc: Marc Zyngier <[email protected]>
> Cc: Robin Murphy <[email protected]>
> Cc: Nishanth Menon <[email protected]>
> Signed-off-by: Matt Ranostay <[email protected]>
Thank you for root causing the bug, BUT, please add a Fixes: tag as
well. this needs to go into stable as well.
> ---
> arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> index be7f39299894..19966f72c5b3 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-main.dtsi
> @@ -33,7 +33,7 @@ gic500: interrupt-controller@1800000 {
> ranges;
> #interrupt-cells = <3>;
> interrupt-controller;
> - reg = <0x00 0x01800000 0x00 0x200000>, /* GICD */
> + reg = <0x00 0x01800000 0x00 0x100000>, /* GICD */
> <0x00 0x01900000 0x00 0x100000>, /* GICR */
> <0x00 0x6f000000 0x00 0x2000>, /* GICC */
> <0x00 0x6f010000 0x00 0x1000>, /* GICH */
> --
> 2.36.1
>
--
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3 1A34 DDB5 849D 1736 249D