2019-06-01 10:08:55 +02:00
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2015-10-02 10:01:19 -04:00
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2018-04-24 17:10:02 -06:00
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2016-02-17 13:20:59 -07:00
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2016-08-16 14:39:40 -06:00
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2020-11-12 19:26:12 +01:00
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2023-12-11 11:48:53 +01:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:40 -06:00
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2016-08-16 14:39:43 -06:00
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2021-09-17 14:33:50 +01:00
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2016-08-16 14:39:43 -06:00
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2018-04-24 17:10:02 -06:00
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2016-08-16 14:39:43 -06:00
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2016-08-16 14:39:40 -06:00
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2016-08-16 14:39:43 -06:00
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2016-08-16 14:39:44 -06:00
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2016-08-16 14:39:43 -06:00
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2016-08-16 14:39:40 -06:00
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2016-08-16 14:39:43 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:43 -06:00
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2016-08-16 14:39:40 -06:00
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2019-03-25 13:34:00 -05:00
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2017-10-11 08:54:58 +00:00
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2019-03-25 13:34:00 -05:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:21:00 -07:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:21:00 -07:00
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2017-05-08 15:57:50 -07:00
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2016-08-16 14:39:40 -06:00
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ACPI: CPPC: Assume no transition latency if no PCCT
The transition_delay_us (struct cpufreq_policy) is currently defined
as:
Preferred average time interval between consecutive invocations of
the driver to set the frequency for this policy. To be set by the
scaling driver (0, which is the default, means no preference).
The transition_latency represents the amount of time necessary for a
CPU to change its frequency.
A PCCT table advertises mutliple values:
- pcc_nominal: Expected latency to process a command, in microseconds
- pcc_mpar: The maximum number of periodic requests that the subspace
channel can support, reported in commands per minute. 0 indicates no
limitation.
- pcc_mrtt: The minimum amount of time that OSPM must wait after the
completion of a command before issuing the next command,
in microseconds.
cppc_get_transition_latency() allows to get the max of them.
commit d4f3388afd48 ("cpufreq / CPPC: Set platform specific
transition_delay_us") allows to select transition_delay_us based on
the platform, and fallbacks to cppc_get_transition_latency()
otherwise.
If _CPC objects are not using PCC channels (no PPCT table), the
transition_delay_us is set to CPUFREQ_ETERNAL, leading to really long
periods between frequency updates (~4s).
If the desired_reg, where performance requests are written, is in
SystemMemory or SystemIo ACPI address space, there is no delay
in requests. So return 0 instead of CPUFREQ_ETERNAL, leading to
transition_delay_us being set to LATENCY_MULTIPLIER us (1000 us).
This patch also adds two macros to check the address spaces.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-05-18 11:08:59 +02:00
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2021-03-12 18:55:35 -07:00
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2016-08-16 14:39:42 -06:00
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2021-03-12 18:55:35 -07:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:20:59 -07:00
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2015-10-02 10:01:19 -04:00
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2018-02-06 17:36:17 -06:00
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2015-10-02 10:01:19 -04:00
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2021-12-24 09:04:57 +08:00
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2016-08-16 14:39:42 -06:00
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2021-04-07 14:30:48 -07:00
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2016-08-16 14:39:42 -06:00
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2017-03-29 13:50:00 -06:00
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2021-04-07 14:30:48 -07:00
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2017-03-29 13:50:00 -06:00
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2022-11-30 16:16:08 +08:00
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2017-03-29 13:50:00 -06:00
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2018-04-04 12:14:50 -06:00
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2017-03-29 13:50:00 -06:00
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2024-03-01 11:25:59 -08:00
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2016-08-16 14:39:42 -06:00
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2021-04-07 14:30:48 -07:00
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2016-08-16 14:39:42 -06:00
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2017-03-29 13:50:00 -06:00
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2016-08-16 14:39:42 -06:00
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2017-03-29 13:50:00 -06:00
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2016-08-16 14:39:42 -06:00
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2022-11-30 16:16:08 +08:00
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2016-08-16 14:39:42 -06:00
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2017-03-29 13:50:00 -06:00
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2018-04-04 12:14:50 -06:00
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2016-08-16 14:39:42 -06:00
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2021-12-28 14:14:23 +01:00
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2016-08-16 14:39:42 -06:00
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2023-02-14 03:23:52 +00:00
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2016-08-16 14:39:42 -06:00
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2021-12-28 14:14:23 +01:00
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2016-08-16 14:39:42 -06:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:20:59 -07:00
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2018-04-24 17:10:02 -06:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:20:59 -07:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:44 -06:00
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2018-04-24 17:10:02 -06:00
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2016-02-17 13:20:59 -07:00
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2018-04-24 17:10:02 -06:00
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2017-10-11 08:54:58 +00:00
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2018-04-24 17:10:02 -06:00
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2016-08-16 14:39:44 -06:00
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2016-02-17 13:20:59 -07:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2021-01-07 11:17:16 +00:00
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2016-02-17 13:21:03 -07:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:20:59 -07:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:20:59 -07:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:21:03 -07:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:21:03 -07:00
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2017-10-11 08:54:58 +00:00
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2018-02-20 11:16:03 +00:00
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2016-08-16 14:39:40 -06:00
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2016-02-17 13:21:03 -07:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:21:03 -07:00
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2017-10-11 08:54:58 +00:00
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2016-02-17 13:21:03 -07:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:21:02 -07:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:21:02 -07:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:44 -06:00
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2015-10-02 10:01:19 -04:00
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2021-09-17 14:33:50 +01:00
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2016-02-17 13:20:59 -07:00
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2018-02-20 11:16:03 +00:00
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2016-08-16 14:39:40 -06:00
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2015-10-02 10:01:19 -04:00
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2022-05-21 13:10:13 +02:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:44 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2021-09-17 14:33:50 +01:00
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2016-09-14 10:54:58 -07:00
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2021-09-17 14:33:50 +01:00
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2016-08-16 14:39:40 -06:00
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2021-03-27 20:08:20 +08:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2016-02-17 13:20:59 -07:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:20:59 -07:00
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2015-10-02 10:01:19 -04:00
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2020-04-23 15:21:58 +08:00
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2015-10-02 10:01:19 -04:00
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ACPI / CPPC: do not require the _PSD method
According to the ACPI 6.3 specification, the _PSD method is optional
when using CPPC. The underlying assumption is that each CPU can change
frequency independently from all other CPUs; _PSD is provided to tell
the OS that some processors can NOT do that.
However, the acpi_get_psd() function returns ENODEV if there is no _PSD
method present, or an ACPI error status if an error occurs when evaluating
_PSD, if present. This makes _PSD mandatory when using CPPC, in violation
of the specification, and only on Linux.
This has forced some firmware writers to provide a dummy _PSD, even though
it is irrelevant, but only because Linux requires it; other OSPMs follow
the spec. We really do not want to have OS specific ACPI tables, though.
So, correct acpi_get_psd() so that it does not return an error if there
is no _PSD method present, but does return a failure when the method can
not be executed properly. This allows _PSD to be optional as it should
be.
Signed-off-by: Al Stone <ahs3@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-08-27 18:21:20 -06:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2022-08-15 00:35:48 +08:00
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2021-12-24 09:04:58 +08:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2022-05-18 11:09:00 +02:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
|
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|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
|
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|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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|
2015-10-02 10:01:19 -04:00
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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|
2015-10-02 10:01:19 -04:00
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
|
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|
|
|
2015-10-02 10:01:19 -04:00
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2015-10-02 10:01:19 -04:00
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
|
|
|
|
|
|
|
|
|
2015-10-02 10:01:19 -04:00
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
|
|
|
|
2015-10-02 10:01:19 -04:00
|
|
|
|
|
|
|
|
|
cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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cppc_cpufreq: replace per-cpu data array with a list
The cppc_cpudata per-cpu storage was inefficient (1) additional to causing
functional issues (2) when CPUs are hotplugged out, due to per-cpu data
being improperly initialised.
(1) The amount of information needed for CPPC performance control in its
cpufreq driver depends on the domain (PSD) coordination type:
ANY: One set of CPPC control and capability data (e.g desired
performance, highest/lowest performance, etc) applies to all
CPUs in the domain.
ALL: Same as ANY. To be noted that this type is not currently
supported. When supported, information about which CPUs
belong to a domain is needed in order for frequency change
requests to be sent to each of them.
HW: It's necessary to store CPPC control and capability
information for all the CPUs. HW will then coordinate the
performance state based on their limitations and requests.
NONE: Same as HW. No HW coordination is expected.
Despite this, the previous initialisation code would indiscriminately
allocate memory for all CPUs (all_cpu_data) and unnecessarily
duplicate performance capabilities and the domain sharing mask and type
for each possible CPU.
(2) With the current per-cpu structure, when having ANY coordination,
the cppc_cpudata cpu information is not initialised (will remain 0)
for all CPUs in a policy, other than policy->cpu. When policy->cpu is
hotplugged out, the driver will incorrectly use the uninitialised (0)
value of the other CPUs when making frequency changes. Additionally,
the previous values stored in the perf_ctrls.desired_perf will be
lost when policy->cpu changes.
Therefore replace the array of per cpu data with a list. The memory for
each structure is allocated at policy init, where a single structure
can be allocated per policy, not per cpu. In order to accommodate the
struct list_head node in the cppc_cpudata structure, the now unused cpu
and cur_policy variables are removed.
For example, on a arm64 Juno platform with 6 CPUs: (0, 1, 2, 3) in PSD1,
(4, 5) in PSD2 - ANY coordination, the memory allocation comparison shows:
Before patch:
- ANY coordination:
total slack req alloc/free caller
0 0 0 0/1 _kernel_size_le_hi32+0x0xffff800008ff7810
0 0 0 0/6 _kernel_size_le_hi32+0x0xffff800008ff7808
128 80 48 1/0 _kernel_size_le_hi32+0x0xffff800008ffc070
768 0 768 6/0 _kernel_size_le_hi32+0x0xffff800008ffc0e4
After patch:
- ANY coordination:
total slack req alloc/free caller
256 0 256 2/0 _kernel_size_le_hi32+0x0xffff800008fed410
0 0 0 0/2 _kernel_size_le_hi32+0x0xffff800008fed274
Additional notes:
- A pointer to the policy's cppc_cpudata is stored in policy->driver_data
- Driver registration is skipped if _CPC entries are not present.
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Tested-by: Mian Yousaf Kaukab <ykaukab@suse.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2020-12-14 12:38:23 +00:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2021-09-17 14:33:50 +01:00
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2016-02-17 13:20:59 -07:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2021-09-17 14:33:50 +01:00
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2015-10-02 10:01:19 -04:00
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2021-09-17 14:33:50 +01:00
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2018-02-20 11:16:03 +00:00
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2015-10-02 10:01:19 -04:00
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2021-09-17 14:33:50 +01:00
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2016-02-17 13:20:59 -07:00
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2021-09-17 14:33:50 +01:00
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2018-04-24 17:10:02 -06:00
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2021-09-17 14:33:50 +01:00
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2017-10-11 08:54:58 +00:00
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2021-09-17 14:33:50 +01:00
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2017-10-11 08:54:58 +00:00
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2018-02-20 11:16:03 +00:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2022-07-05 13:29:15 -05:00
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2017-10-11 08:54:58 +00:00
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2023-02-08 10:31:58 +08:00
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2017-10-11 08:54:58 +00:00
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2019-03-25 13:34:00 -05:00
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2017-10-11 08:54:58 +00:00
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2020-04-23 15:21:58 +08:00
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2017-10-11 08:54:58 +00:00
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2018-04-04 12:14:50 -06:00
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2015-10-02 10:01:19 -04:00
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2021-12-22 16:04:45 +02:00
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2015-10-02 10:01:19 -04:00
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2021-12-22 16:04:45 +02:00
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2015-10-02 10:01:19 -04:00
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2022-03-10 14:54:49 +00:00
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2020-11-12 19:26:12 +01:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2022-03-22 17:03:23 +01:00
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2015-10-02 10:01:19 -04:00
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2022-07-05 13:29:14 -05:00
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2022-07-05 13:29:15 -05:00
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2022-07-05 13:29:14 -05:00
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2022-03-16 13:39:03 +01:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2022-03-22 17:02:05 +01:00
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2015-10-02 10:01:19 -04:00
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2022-03-22 17:03:23 +01:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:38 -06:00
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2015-10-02 10:01:19 -04:00
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2022-03-22 17:03:23 +01:00
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2015-10-02 10:01:19 -04:00
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2022-07-21 19:41:10 +02:00
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2015-10-02 10:01:19 -04:00
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2022-07-21 19:41:10 +02:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2022-03-22 17:03:23 +01:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:38 -06:00
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2024-03-01 11:25:59 -08:00
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2016-08-16 14:39:38 -06:00
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2022-05-18 11:08:57 +02:00
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2022-07-15 12:33:25 -05:00
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2022-05-18 11:08:57 +02:00
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2024-03-01 11:25:59 -08:00
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2016-08-16 14:39:38 -06:00
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2021-12-24 09:04:57 +08:00
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2022-03-22 17:03:23 +01:00
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2021-12-24 09:04:57 +08:00
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2022-03-22 17:03:23 +01:00
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2021-12-24 09:04:57 +08:00
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2022-05-18 11:08:57 +02:00
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2022-07-15 12:33:25 -05:00
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2022-05-18 11:08:57 +02:00
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2016-08-16 14:39:38 -06:00
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2016-09-01 13:37:10 -07:00
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2021-12-24 09:04:57 +08:00
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2022-03-22 17:03:23 +01:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2022-03-22 17:03:23 +01:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2018-04-04 12:14:50 -06:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:43 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2016-11-30 22:22:54 +03:00
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2016-08-16 14:39:42 -06:00
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2016-11-30 22:22:54 +03:00
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2016-08-16 14:39:42 -06:00
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2019-03-25 13:34:00 -05:00
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2016-12-10 00:52:28 +01:00
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2016-08-16 14:39:42 -06:00
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2016-12-10 00:52:28 +01:00
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2020-05-27 17:35:51 -05:00
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2016-08-16 14:39:42 -06:00
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2016-12-10 00:52:28 +01:00
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2016-08-16 14:39:42 -06:00
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2022-03-10 14:54:49 +00:00
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2020-11-12 19:26:12 +01:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:38 -06:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:38 -06:00
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2017-10-11 08:54:58 +00:00
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2021-03-27 20:08:20 +08:00
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2017-10-11 08:54:58 +00:00
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2019-10-15 22:07:31 +08:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2016-12-07 20:06:08 +01:00
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2016-08-16 14:39:38 -06:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2019-03-25 13:34:00 -05:00
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2016-09-01 13:37:10 -07:00
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2019-03-25 13:34:00 -05:00
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2016-09-01 13:37:10 -07:00
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2016-02-17 13:21:00 -07:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2021-01-07 11:17:17 +00:00
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2024-03-01 11:25:59 -08:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:38 -06:00
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2022-01-12 19:27:22 +01:00
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2016-08-16 14:39:38 -06:00
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2016-02-17 13:21:00 -07:00
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2021-12-24 09:04:57 +08:00
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2024-03-01 11:25:59 -08:00
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2022-01-12 19:26:32 +01:00
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2021-12-24 09:04:57 +08:00
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2022-01-12 19:26:32 +01:00
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2021-12-24 09:04:57 +08:00
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2022-01-12 19:26:32 +01:00
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2021-12-24 09:04:57 +08:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:38 -06:00
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2016-09-01 13:37:10 -07:00
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2016-08-16 14:39:38 -06:00
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2015-10-02 10:01:19 -04:00
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2024-03-01 11:25:59 -08:00
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2021-03-27 20:08:20 +08:00
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2022-01-12 19:27:22 +01:00
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2016-08-16 14:39:38 -06:00
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2024-03-01 11:25:59 -08:00
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2022-01-12 19:27:22 +01:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2016-02-17 13:21:00 -07:00
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2024-03-01 11:25:59 -08:00
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2021-01-07 11:17:17 +00:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:38 -06:00
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2016-02-17 13:21:00 -07:00
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2021-12-24 09:04:57 +08:00
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2024-03-01 11:25:59 -08:00
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2021-12-24 09:04:57 +08:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:38 -06:00
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2016-09-01 13:37:10 -07:00
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2016-08-16 14:39:38 -06:00
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2015-10-02 10:01:19 -04:00
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2024-03-01 11:25:59 -08:00
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2021-03-27 20:08:20 +08:00
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2016-08-16 14:39:38 -06:00
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2016-02-17 13:21:00 -07:00
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2015-10-02 10:01:19 -04:00
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2021-09-04 15:51:45 +02:00
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2019-02-17 11:54:14 +08:00
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2021-11-18 14:37:38 +01:00
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2019-02-17 11:54:14 +08:00
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2021-09-04 15:51:45 +02:00
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2019-02-17 11:54:14 +08:00
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2021-09-04 15:51:45 +02:00
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2019-02-17 11:54:14 +08:00
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2021-09-04 15:51:45 +02:00
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2019-02-17 11:54:14 +08:00
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2021-09-04 15:51:45 +02:00
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2019-02-17 11:54:14 +08:00
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2021-09-04 15:51:45 +02:00
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2024-01-19 17:04:57 +08:00
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2023-01-31 17:00:06 +08:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2017-03-29 13:49:59 -06:00
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2018-10-15 10:37:19 -07:00
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2018-04-04 12:14:50 -06:00
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2018-10-15 10:37:19 -07:00
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2017-10-11 08:54:58 +00:00
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2018-04-04 12:14:51 -06:00
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2016-08-16 14:39:39 -06:00
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2015-10-02 10:01:19 -04:00
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2018-04-04 12:14:51 -06:00
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2015-10-02 10:01:19 -04:00
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2017-03-29 13:49:59 -06:00
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2018-04-04 12:14:50 -06:00
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2018-10-15 10:37:19 -07:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:40 -06:00
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2018-04-04 12:14:50 -06:00
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2018-04-04 12:14:51 -06:00
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2016-08-16 14:39:39 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2017-03-29 13:49:59 -06:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 09:04:39 -07:00
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2018-10-15 10:37:19 -07:00
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2017-03-29 13:49:59 -06:00
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2015-10-02 10:01:19 -04:00
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2018-04-04 12:14:50 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:39 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2022-09-12 15:37:22 -05:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2017-10-11 08:54:58 +00:00
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2018-04-04 12:14:51 -06:00
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2016-08-16 14:39:42 -06:00
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2016-08-16 14:39:39 -06:00
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2015-10-02 10:01:19 -04:00
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2018-04-04 12:14:51 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2019-03-25 13:34:00 -05:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2018-04-04 12:14:51 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:39 -06:00
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2015-10-02 10:01:19 -04:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2016-09-01 13:37:10 -07:00
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2016-08-16 14:39:42 -06:00
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2016-09-01 13:37:10 -07:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:42 -06:00
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2017-03-29 13:50:00 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:39 -06:00
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2017-10-11 08:54:58 +00:00
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2015-10-02 10:01:19 -04:00
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2023-01-31 17:00:06 +08:00
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2023-03-07 11:27:36 +00:00
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2021-12-24 09:04:59 +08:00
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2015-10-02 10:01:19 -04:00
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2019-03-25 13:34:00 -05:00
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2015-10-02 10:01:19 -04:00
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2023-03-07 11:27:35 +00:00
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2017-10-11 08:54:58 +00:00
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2018-04-04 12:14:51 -06:00
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2015-10-02 10:01:19 -04:00
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2018-04-04 12:14:51 -06:00
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2015-10-02 10:01:19 -04:00
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2023-03-07 11:27:35 +00:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:40 -06:00
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2023-03-07 11:27:35 +00:00
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2018-04-04 12:14:51 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2016-08-16 14:39:44 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2016-02-17 13:20:59 -07:00
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2023-03-07 11:27:35 +00:00
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2015-10-02 10:01:19 -04:00
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2023-03-07 11:27:35 +00:00
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2015-10-02 10:01:19 -04:00
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2023-03-07 11:27:35 +00:00
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2015-10-02 10:01:19 -04:00
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2023-03-07 11:27:35 +00:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2019-03-25 13:34:00 -05:00
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2016-08-16 14:39:40 -06:00
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2021-03-12 18:55:35 -07:00
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2016-08-16 14:39:40 -06:00
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2023-03-07 11:27:35 +00:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:40 -06:00
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2015-10-02 10:01:19 -04:00
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2016-08-16 14:39:41 -06:00
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2023-02-08 10:31:58 +08:00
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2016-08-16 14:39:41 -06:00
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2021-03-12 18:55:35 -07:00
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2016-08-16 14:39:41 -06:00
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ACPI: CPPC: Assume no transition latency if no PCCT
The transition_delay_us (struct cpufreq_policy) is currently defined
as:
Preferred average time interval between consecutive invocations of
the driver to set the frequency for this policy. To be set by the
scaling driver (0, which is the default, means no preference).
The transition_latency represents the amount of time necessary for a
CPU to change its frequency.
A PCCT table advertises mutliple values:
- pcc_nominal: Expected latency to process a command, in microseconds
- pcc_mpar: The maximum number of periodic requests that the subspace
channel can support, reported in commands per minute. 0 indicates no
limitation.
- pcc_mrtt: The minimum amount of time that OSPM must wait after the
completion of a command before issuing the next command,
in microseconds.
cppc_get_transition_latency() allows to get the max of them.
commit d4f3388afd48 ("cpufreq / CPPC: Set platform specific
transition_delay_us") allows to select transition_delay_us based on
the platform, and fallbacks to cppc_get_transition_latency()
otherwise.
If _CPC objects are not using PCC channels (no PPCT table), the
transition_delay_us is set to CPUFREQ_ETERNAL, leading to really long
periods between frequency updates (~4s).
If the desired_reg, where performance requests are written, is in
SystemMemory or SystemIo ACPI address space, there is no delay
in requests. So return 0 instead of CPUFREQ_ETERNAL, leading to
transition_delay_us being set to LATENCY_MULTIPLIER us (1000 us).
This patch also adds two macros to check the address spaces.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-05-18 11:08:59 +02:00
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2016-08-16 14:39:41 -06:00
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2017-10-11 08:54:58 +00:00
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2017-12-04 14:06:54 +00:00
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2016-08-16 14:39:41 -06:00
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ACPI: CPPC: Assume no transition latency if no PCCT
The transition_delay_us (struct cpufreq_policy) is currently defined
as:
Preferred average time interval between consecutive invocations of
the driver to set the frequency for this policy. To be set by the
scaling driver (0, which is the default, means no preference).
The transition_latency represents the amount of time necessary for a
CPU to change its frequency.
A PCCT table advertises mutliple values:
- pcc_nominal: Expected latency to process a command, in microseconds
- pcc_mpar: The maximum number of periodic requests that the subspace
channel can support, reported in commands per minute. 0 indicates no
limitation.
- pcc_mrtt: The minimum amount of time that OSPM must wait after the
completion of a command before issuing the next command,
in microseconds.
cppc_get_transition_latency() allows to get the max of them.
commit d4f3388afd48 ("cpufreq / CPPC: Set platform specific
transition_delay_us") allows to select transition_delay_us based on
the platform, and fallbacks to cppc_get_transition_latency()
otherwise.
If _CPC objects are not using PCC channels (no PPCT table), the
transition_delay_us is set to CPUFREQ_ETERNAL, leading to really long
periods between frequency updates (~4s).
If the desired_reg, where performance requests are written, is in
SystemMemory or SystemIo ACPI address space, there is no delay
in requests. So return 0 instead of CPUFREQ_ETERNAL, leading to
transition_delay_us being set to LATENCY_MULTIPLIER us (1000 us).
This patch also adds two macros to check the address spaces.
Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2022-05-18 11:08:59 +02:00
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2016-08-16 14:39:41 -06:00
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2017-12-04 14:06:54 +00:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:41 -06:00
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2017-10-11 08:54:58 +00:00
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2016-08-16 14:39:41 -06:00
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2023-12-11 11:48:53 +01:00
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