Add and ACPI idle power level limit for 32-bit ThinkPad T40.

There is a regression on T40 introduced by commit d6b88ce2, starting
with kernel 5.16:

commit d6b88ce2eb9d2698eb24451eb92c0a1649b17bb1
Author: Richard Gong <richard.gong@amd.com>
Date:   Wed Sep 22 08:31:16 2021 -0500

  ACPI: processor idle: Allow playing dead in C3 state

The above patch is trying to enter C3 state during init, what is causing
a T40 system freeze. I have not found a similar issue on any other of my
32-bit machines.

The fix is to add another exception to the processor_power_dmi_table[] list.
As a result the dmesg shows as expected:

[2.155398] ACPI: IBM ThinkPad T40 detected - limiting to C2 max_cstate. Override with "processor.max_cstate=9"
[2.155404] ACPI: processor limited to max C-state 2

The fix is trivial and affects only vintage T40 systems.

Fixes: d6b88ce2eb9d ("CPI: processor idle: Allow playing dead in C3 state")
Signed-off-by: Woody Suwalski <wsuwalski@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Cc: 5.16+ <stable@vger.kernel.org> # 5.16+
[ rjw: New subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Merge ACPI EC driver updates and ACPI processor driver updates for
5.17-rc1:

 - Rework flushing of EC work while suspended to idle and clean up
   the handling of events in the ACPI EC driver (Rafael Wysocki).

 - Prohibit ec_sys module parameter write_support from being used
   when the system is locked down (Hans de Goede).

 - Make the ACPI processor thermal driver use cpufreq_cpu_get() to
   check for presence of cpufreq policy (Manfred Spraul).

 - Avoid unnecessary CPU cache flushing in the ACPI processor idle
   driver (Kirill A. Shutemov).

 - Replace kernel.h with the necessary inclusions in the ACPI
   processor driver (Andy Shevchenko).

 - Use swap() instead of open coding it in the ACPI processor idle
   driver (Guo Zhengkui).

* acpi-ec:
  ACPI: EC: Mark the ec_sys write_support param as module_param_hw()
  ACPI: EC: Relocate acpi_ec_create_query() and drop acpi_ec_delete_query()
  ACPI: EC: Make the event work state machine visible
  ACPI: EC: Avoid queuing unnecessary work in acpi_ec_submit_event()
  ACPI: EC: Rename three functions
  ACPI: EC: Simplify locking in acpi_ec_event_handler()
  ACPI: EC: Rearrange the loop in acpi_ec_event_handler()
  ACPI: EC: Fold acpi_ec_check_event() into acpi_ec_event_handler()
  ACPI: EC: Pass one argument to acpi_ec_query()
  ACPI: EC: Call advance_transaction() from acpi_ec_dispatch_gpe()
  ACPI: EC: Rework flushing of EC work while suspended to idle

* acpi-processor:
  ACPI: processor: thermal: avoid cpufreq_get_policy()
  ACPI: processor: idle: Only flush cache on entering C3
  ACPI: processor idle: Use swap() instead of open coding it
  ACPI: processor: Replace kernel.h with the necessary inclusions

According to ACPI 6.4, Section 8.2, CPU cache flushing required on
entering the C3 power state.

Avoid flushing the cache on entering other C-states.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
[ rjw: Changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Modify the ACPI code to use acpi_fetch_acpi_dev() instead of
acpi_bus_get_device() where applicable.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>

Address the following coccicheck warning:

./drivers/net/ethernet/mellanox/mlx5/core/en/tc_ct.c:914:40-41:
WARNING opportunity for swap().

by using swap() for the swapping of variable values and drop
the tmp variable that is not needed any more.

Signed-off-by: Guo Zhengkui <guozhengkui@vivo.com>
[ rjw: Subject and changelog rewrite ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

When some cores are disabled on AMD platforms, the system will no longer
be able to enter suspend-to-idle s0ix.

Update to allow playing dead in C3 state so that the CPUs can enter the
deepest state on AMD platforms.

BugLink: https://gitlab.freedesktop.org/drm/amd/-/issues/1708
Suggested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Richard Gong <richard.gong@amd.com>
[ rjw: Fixed coding style ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

The functions cpu_hotplug_begin, cpu_hotplug_done, get_online_cpus() and
put_online_cpus() have been deprecated during the CPU hotplug rework. They map
directly to cpus_write_lock(), cpus_write_unlock, cpus_read_lock() and
cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Generally, the C-state latency is provided by the _CST method or
FADT, but some OEM platforms using AMD Picasso, Renoir, Van Gogh,
and Cezanne set the C2 latency greater than C3's which causes the
C2 state to be skipped.

That will block the core entering PC6, which prevents S0ix working
properly on Linux systems.

In other operating systems, the latency values are not validated and
this does not cause problems by skipping states.

To avoid this issue on Linux, detect when latencies are not an
arithmetic progression and sort them.

Link: https://gitlab.freedesktop.org/agd5f/linux/-/commit/026d186e4592c1ee9c1cb44295912d0294508725
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1230#note_712174
Suggested-by: Prike Liang <Prike.Liang@amd.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

* acpi-pci:
  ACPI: PCI: Replace direct printk() invocations in pci_link.c
  ACPI: PCI: Drop ACPI_PCI_COMPONENT that is not used any more
  ACPI: PCI: Replace ACPI_DEBUG_PRINT() and ACPI_EXCEPTION()
  ACPI: PCI: IRQ: Consolidate printing diagnostic messages

* acpi-processor:
  ACPI: processor: perflib: Eliminate redundant status check
  ACPI: processor: Get rid of ACPICA message printing
  ACPI: processor: idle: Drop extra prefix from pr_notice()
  ACPI: processor: Remove initialization of static variable

Commit 8cdddd182bd7 ("ACPI: processor: Fix CPU0 wakeup in
acpi_idle_play_dead()") tried to fix CPU0 hotplug breakage by copying
wakeup_cpu0() + start_cpu0() logic from hlt_play_dead()//mwait_play_dead()
into acpi_idle_play_dead(). The problem is that these functions are not
exported to modules so when CONFIG_ACPI_PROCESSOR=m build fails.

The issue could've been fixed by exporting both wakeup_cpu0()/start_cpu0()
(the later from assembly) but it seems putting the whole pattern into a
new function and exporting it instead is better.

Reported-by: kernel test robot <lkp@intel.com>
Fixes: 8cdddd182bd7 ("CPI: processor: Fix CPU0 wakeup in acpi_idle_play_dead()")
Cc: <stable@vger.kernel.org> # 5.10+
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>