platform/x86/intel/pmc: Read low power mode requirements for MTL-M and MTL-P

Add support to read the low power mode requirements for Meteor Lake M and
Meteor Lake P.

Signed-off-by: Xi Pardee <xi.pa

platform/x86/intel/pmc: Read low power mode requirements for MTL-M and MTL-P

Add support to read the low power mode requirements for Meteor Lake M and
Meteor Lake P.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-19-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc: Retrieve LPM information using Intel PMT

On supported platforms, the low power mode (LPM) requirements for entering
each idle substate are described in Platform Monitoring Te

platform/x86/intel/pmc: Retrieve LPM information using Intel PMT

On supported platforms, the low power mode (LPM) requirements for entering
each idle substate are described in Platform Monitoring Technology (PMT)
telemetry entries. Provide a function for platform code to attempt to find
and read the requirements from the telemetry entries.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-18-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

Update the substate_requirements attribute to display the requirements for
all the PMCs on a package.

Signed-off-by: Rajvi Jingar

platform/x86/intel/pmc: Display LPM requirements for multiple PMCs

Update the substate_requirements attribute to display the requirements for
all the PMCs on a package.

Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-17-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc: Find and register PMC telemetry entries

The PMC SSRAM device contains counters that are structured in Intel
Platform Monitoring Technology (PMT) telemetry regions. Look for a

platform/x86/intel/pmc: Find and register PMC telemetry entries

The PMC SSRAM device contains counters that are structured in Intel
Platform Monitoring Technology (PMT) telemetry regions. Look for and
register these telemetry regions from the driver so that they may be read
using the Intel PMT ABI.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-16-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc/mtl: Use return value from pmc_core_ssram_init()

Instead of checking for a NULL regbase, use the return value from
pmc_core_ssram_init() to check if PMC discovery was successf

platform/x86/intel/pmc/mtl: Use return value from pmc_core_ssram_init()

Instead of checking for a NULL regbase, use the return value from
pmc_core_ssram_init() to check if PMC discovery was successful. If not, use
the legacy enumeration method (which only works for the primary PMC).

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-15-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc: Cleanup SSRAM discovery

Clean up the code handling SSRAM discovery. Handle all resource allocation
and cleanup in pmc_core_ssram_get_pmc(). Return the error status from this

platform/x86/intel/pmc: Cleanup SSRAM discovery

Clean up the code handling SSRAM discovery. Handle all resource allocation
and cleanup in pmc_core_ssram_get_pmc(). Return the error status from this
function but only fail the init if we fail to discover the primary PMC.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-14-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86/intel/pmc: Allow pmc_core_ssram_init to fail

Currently, if the PMC SSRAM initialization fails, no error is returned and
the only indication is that a PMC device has not been created. I

platform/x86/intel/pmc: Allow pmc_core_ssram_init to fail

Currently, if the PMC SSRAM initialization fails, no error is returned and
the only indication is that a PMC device has not been created. Instead,
allow an error to be returned and handled directly by the caller.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-13-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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platform/x86:intel/pmc: Call pmc_get_low_power_modes from platform init

In order to setup a table of low power mode requirements for Meteor Lake,
pmc_core_get_low_power_modes() will need to be run f

platform/x86:intel/pmc: Call pmc_get_low_power_modes from platform init

In order to setup a table of low power mode requirements for Meteor Lake,
pmc_core_get_low_power_modes() will need to be run from platform init code
so that the enabled modes are known, allowing the use of the
pmc_for_each_mode helper. Make the function global and call it from the
platform init code.

Signed-off-by: Xi Pardee <xi.pardee@intel.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231129222132.2331261-12-david.e.box@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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