Re: [v5.4 stable] arm: stm32: Regression observed on "no-map" reserved memory region

[Alexandre TORGUE]

Hi Quentin

On 4/22/21 2:59 PM, Quentin Perret wrote:
> On Wednesday 21 Apr 2021 at 07:33:52 (-0700), Florian Fainelli wrote:
> > It is not, otherwise I would have noticed earlier, can you try the same
> > thing that happens on my platform with a reserved region (without
> > no-map) adjacent to a reserved region with 'no-map'?
>
> I just tried, but still no luck. FTR, I tried to reproduce your setup
> with the following DT:
>
>          memory@40000000 {
>                  reg = <0x00 0x40000000 0x01 0x00>;
>                  device_type = "memory";
>          };
>
>          reserved-memory {
>                  #address-cells = <2>;
>                  #size-cells = <2>;
>                  ranges;
>
>                  foo@fdfff000{
>                          reg = <0x00 0xfdfff000 0x0 0x1000>;
>                  };
>                  bar@fe000000{
>                          reg = <0x00 0xfe000000 0x0 0x2000000>;
>                          no-map;
>                  };
>          };
>
> And with 5.4.102 and 5.10.31 I get the following in /proc/iomem
>
> <...>
> 40000000-fdffffff : System RAM
>    40080000-412cffff : Kernel code
>    412d0000-417affff : reserved
>    417b0000-419f8fff : Kernel data
>    48000000-48008fff : reserved
>    f7c00000-fdbfffff : reserved
>    fdfff000-fdffffff : reserved
> fe000000-ffffffff : reserved
> 100000000-13fffffff : System RAM
> <...>
>
> which looks about right. I'll keep trying a few other things.

Did you get time to continue some tests on this issue ?

On my side this DT is not working:

memory@c0000000 {
        reg = <0xc0000000 0x20000000>;
};

reserved-memory {
        #address-cells = <1>;
        #size-cells = <1>;
        ranges;

        gpu_reserved: gpu@d4000000 {
                reg = <0xd4000000 0x4000000>;
                no-map;
        };
};

Let me know if I can help.

regards
Alex

> Thanks,
> Quentin