[PATCH 06/13] ARM: dts: omap4-panda-common: Add CMA pools and enable IPU & DSP

[Guillaume Tucker]

On 10/07/2020 00:19, Suman Anna wrote:
> The CMA reserved memory nodes have been added for the IPU and DSP
> remoteproc devices on all the OMAP4-based Panda boards. These nodes
> are assigned to the respective rproc device nodes, and both the
> IPU and DSP remote processors are enabled for all these boards.
> 
> The current CMA pools and sizes are defined statically for each device.
> The starting addresses are fixed to meet current dependencies on the
> remote processor firmwares, and will go away when the remote-side
> code has been improved to gather this information runtime during
> its initialization.
> 
> An associated pair of the rproc node and its CMA node can be disabled
> later on if there is no use-case defined to use that remote processor.
> 
> Signed-off-by: Suman Anna <s-anna at ti.com>
> ---
>  arch/arm/boot/dts/omap4-panda-common.dtsi | 30 +++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/omap4-panda-common.dtsi b/arch/arm/boot/dts/omap4-panda-common.dtsi
> index 55ea8b6189af..ef79028fc95f 100644
> --- a/arch/arm/boot/dts/omap4-panda-common.dtsi
> +++ b/arch/arm/boot/dts/omap4-panda-common.dtsi
> @@ -12,6 +12,26 @@ memory at 80000000 {
>  		reg = <0x80000000 0x40000000>; /* 1 GB */
>  	};
>  
> +	reserved-memory {
> +		#address-cells = <1>;
> +		#size-cells = <1>;
> +		ranges;
> +
> +		dsp_memory_region: dsp-memory at 98000000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x98000000 0x800000>;
> +			reusable;
> +			status = "okay";
> +		};
> +
> +		ipu_memory_region: ipu-memory at 98800000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x98800000 0x7000000>;
> +			reusable;
> +			status = "okay";
> +		};
> +	};
> +
>  	chosen {
>  		stdout-path = &uart3;
>  	};
> @@ -571,3 +591,13 @@ hdmi_out: endpoint {
>  		};
>  	};
>  };
> +
> +&dsp {
> +	status = "okay";
> +	memory-region = <&dsp_memory_region>;
> +};
> +
> +&ipu {
> +	status = "okay";
> +	memory-region = <&ipu_memory_region>;
> +};
> 

This appears to be causing some BUG alert messages:

  BUG: Bad page state in process swapper/0  pfn:9c801

as reported on kernelci.org:

  https://kernelci.org/test/case/id/5f326c6661360154c452c1c9/

I've run a bisection and it landed on this commit.  If you fix it
with another patch, please add:

  Reported-by: "kernelci.org bot" <bot at kernelci.org>

Hope this helps!

Thanks,
Guillaume