Re: [PATCH 0/3] platform/x86/amd/hsmp: Harden ACPI probe, metric DRAM, and socket teardown

["M K, Muralidhara" <muralimk@amd.com>]

Hi Ilpo,
Could you please check and review.

On 6/14/2026 12:47 AM, Muralidhara M K wrote:
> This series tightens concurrency and lifetime management in the ACPI-backed
> AMD HSMP platform path so probe/remove races cannot corrupt global probe state,
> leak metric-table DRAM mappings, or tear down shared resources while readers
> might still be active.
> 
> Patch 1 introduces a dedicated probe mutex around ACPI probe, remove, and
> init_acpi(), replacing ad-hoc synchronization on the global is_probed handshake.
> lockdep_assert_held() documents the locking contract for init_acpi().
> 
> Patch 2 switches metric table DRAM from devm_ioremap() to ioremap() with
> explicit init/teardown helpers, and embeds a per-socket mutex for metric reads.
> The legacy platform driver wires the same helpers so non-ACPI builds stay
> consistent.
> 
> Patch 3 replaces the global is_probed flag with miscdevice registration state,
> refcounts ACPI socket platform devices with kref, and runs coordinated release
> on the final put: misc deregistration when appropriate, metric unmap, and socket
> array free. Socket storage uses kcalloc() with careful failure cleanup before
> any kref is published.
> 
> Muralidhara M K (3):
>    platform/x86/amd/hsmp: Serialize ACPI HSMP is_probed with a probe
>      mutex
>    platform/x86/amd/hsmp: Add explicit metric DRAM mapping and per-socket
>      mutexes
>    platform/x86/amd/hsmp: ACPI HSMP refcounted sockets and coordinated
>      release
> 
>   drivers/platform/x86/amd/hsmp/acpi.c | 87 +++++++++++++++++++++++-----
>   drivers/platform/x86/amd/hsmp/hsmp.c | 38 +++++++++++-
>   drivers/platform/x86/amd/hsmp/hsmp.h |  9 ++-
>   drivers/platform/x86/amd/hsmp/plat.c |  3 +
>   4 files changed, 119 insertions(+), 18 deletions(-)
>