Re: [PATCH v9 00/12] Support PPTT for ARM64

[Geert Uytterhoeven <geert@linux-m68k.org>]

Hi Catalin, Jeremy,

On Thu, May 17, 2018 at 7:05 PM, Catalin Marinas
<catalin.marinas@arm.com> wrote:
> On Fri, May 11, 2018 at 06:57:55PM -0500, Jeremy Linton wrote:
>> Jeremy Linton (12):
>>   drivers: base: cacheinfo: move cache_setup_of_node()
>>   drivers: base: cacheinfo: setup DT cache properties early
>>   cacheinfo: rename of_node to fw_token
>>   arm64/acpi: Create arch specific cpu to acpi id helper
>>   ACPI/PPTT: Add Processor Properties Topology Table parsing
>>   ACPI: Enable PPTT support on ARM64
>>   drivers: base cacheinfo: Add support for ACPI based firmware tables
>>   arm64: Add support for ACPI based firmware tables
>>   arm64: topology: rename cluster_id
>>   arm64: topology: enable ACPI/PPTT based CPU topology
>>   ACPI: Add PPTT to injectable table list
>>   arm64: topology: divorce MC scheduling domain from core_siblings
>
> Queued for 4.18 (without Sudeep's latest property_read_u64 cacheinfo
> patch - http://lkml.kernel.org/r/20180517154701.GA20281@e107155-lin; I
> can add it separately).

This is now commit 37c3ec2d810f87ea ("arm64: topology: divorce MC
scheduling domain from core_siblings") in arm64/for-next/core, causing
system suspend on big.LITTLE systems to hang after shutting down the first
CPU:

    $ echo mem > /sys/power/state
    PM: suspend entry (deep)
    PM: Syncing filesystems ... done.
    Freezing user space processes ... (elapsed 0.001 seconds) done.
    OOM killer disabled.
    Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
    Disabling non-boot CPUs ...
    CPU1: shutdown
    psci: CPU1 killed.

For me, it fails on the following big.LITTLE systems:

    R-Car H3 ES2.0 (4xCA57 + 4xCA53)
    R-Car M3-W (2xCA57 + 4xCA53)

System supend still works fine on systems with big cores only:

    R-Car H3 ES1.0 (4xCA57 (4xCA53 disabled in firmware))
    R-Car M3-N (2xCA57)

Reverting this commit fixes the issue for me.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds