platform/x86/amd/pmf: Add PMF debug facilities

At times, when the mode transitions fail to happen, the current
driver does not give enough debug information on why the transition
failed or the default preset values did not load. Having an on-demand
logs guarded by CONFIG would be helpful in such cases.

Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230510144751.66601-2-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: Add PMF acpi debug support

PMF driver maintains an internal config store for each PMF feature
after the feature init happens. Having a debug mechanism to triage
in-field issues w.r.t to mode switch not happening based on the OEM
fed values via the ACPI method to PMF driver is becoming the need of
the hour. Add support to get more ACPI debug spew guarded by a CONFIG.

Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230510144751.66601-1-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: update to auto-mode limits only after AMT event

Auto-mode thermal limits should be updated only after receiving the AMT
event. But due to a bug in the older commit, these settings were getting
applied during the auto-mode init.

Fix this by removing amd_pmf_set_automode() during auto-mode
initialization.

Fixes: 3f5571d99524 ("platform/x86/amd/pmf: Add support for Auto mode feature")
Suggested-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230125095936.3292883-4-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: Add helper routine to update SPS thermals

Add helper routine to update the static slider information
and remove the duplicate code occurrences after this change.

Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20230125095936.3292883-2-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: Fix clang unused variable warning

variable 'mode' is used uninitialized whenever switch default is taken
in sps.c which leads to the following clang warning.

drivers/platform/x86/amd/pmf/sps.c:96:2: error: variable 'mode' is used uninitialized whenever switch default is taken [-Werror,-Wsometimes-uninitialized]
default:
^~~~~~~
drivers/platform/x86/amd/pmf/sps.c:101:9: note: uninitialized use occurs here
return mode;
^~~~
drivers/platform/x86/amd/pmf/sps.c:84:9: note: initialize the variable 'mode' to silence this warning
u8 mode;
^
= '\0'
1 error generated.

Fix it by returning -EOPNOTSUPP in default case and also change the return
type of the function amd_pmf_get_pprof_modes() to keep it similar like
other drivers which implement platform_profile.

Fixes: 4c71ae414474 ("platform/x86/amd/pmf: Add support SPS PMF feature")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20220822062917.4061503-1-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: Handle AMT and CQL events for Auto mode

The transition to auto-mode happens when the PMF driver receives
AMT (Auto Mode transition) event. transition logic will reside in the
PMF driver but the events would come from other supported drivers[1].

The thermal parameters would vary between when a performance "on-lap" mode
is detected and versus when not. The CQL event would get triggered from
other drivers, so that PMF driver would adjust the system thermal config
based on the ACPI inputs.

OEMs can control whether or not to enable AMT or CQL via other supported
drivers[1] but the actual transition logic resides in the AMD PMF driver.
When an AMT event is received the automatic mode transition RAPL algorithm
will run. When a CQL event is received an performance "on-lap" mode will
be enabled and thermal parameters will be adjusted accordingly.

[1]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/commit/?h=review-hans&id=755b249250df1b612d982f3b702c831b26ecdf73

Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20220802151149.2123699-10-Shyam-sundar.S-k@amd.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

platform/x86/amd/pmf: Add support for Auto mode feature

This feature has 3 modes quiet, balanced, performance

The objective of this feature is to track the moving average of system
power over the time period specified and switch to the subsequent mode.

In order to do this, PMF driver will get the moving average of APU power
from PMFW and power threshold, time constants, system config parameters
from OEM inputs.

System power as read by PMF driver from PMFW is the filtered value over
the sampling window. Every sampling window, moving average of system power
is computed. At the end of the monitoring window, the moving average is
compared against the threshold for mode switch for decision making.

With AMD managing the system config limits, any mode switch within
auto-mode will result in limits of fPPT/sPPT/STAPM or STT being scaled
down.

When "auto mode" is enabled, the static slider control remains out of
the PMF driver, so the platform_profile registration would not
happen in PMF driver.

The transition to auto-mode only happens when the APMF fn5 is enabled
in BIOS, platform_profile set to "balanced" and a AMT
(Auto Mode transition) is received.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20220802151149.2123699-9-Shyam-sundar.S-k@amd.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>