Re: [PATCH v5 0/2] add SW BOOST support for CPPC
On Tue, Jun 2, 2020 at 7:16 AM Viresh Kumar wrote: > > On 30-05-20, 10:08, Xiongfeng Wang wrote: > > ACPI spec 6.2 section 8.4.7.1 provide the following two CPC registers. > > > > "Highest performance is the absolute maximum performance an individual > > processor may reach, assuming ideal conditions. This performance level > > may not be sustainable for long durations, and may only be achievable if > > other platform components are in a specific state; for example, it may > > require other processors be in an idle state. > > > > Nominal Performance is the maximum sustained performance level of the > > processor, assuming ideal operating conditions. In absence of an > > external constraint (power, thermal, etc.) this is the performance level > > the platform is expected to be able to maintain continuously. All > > processors are expected to be able to sustain their nominal performance > > state simultaneously." > > > > We can use Highest Performance as the max performance in boost mode and > > Nomial Performance as the max performance in non-boost mode. If the > > Highest Performance is greater than the Nominal Performance, we assume > > SW BOOST is supported. > > > > Changelog: > > > > v4 -> v5: > > add 'cpu_hotplug_lock' before calling '.set_boost' > > v3 -> v4: > > run 'boost_set_msr_each' for each CPU in the policy rather than > > each CPU in the system for 'acpi-cpufreq' > > add 'Suggested-by' > > > > Xiongfeng Wang (2): > > cpufreq: change '.set_boost' to act on only one policy > > CPPC: add support for SW BOOST > > > > drivers/cpufreq/acpi-cpufreq.c | 14 ++- > > drivers/cpufreq/cppc_cpufreq.c | 39 +++-- > > drivers/cpufreq/cpufreq.c | 57 > > +++--- > > include/linux/cpufreq.h| 2 +- > > 4 files changed, 77 insertions(+), 35 deletions(-) > > Acked-by: Viresh Kumar Both patches have been applied as 5.8-rc material with slightly modified subjects and the changelog of patch [1/2] has been updated. Thanks!
Re: [PATCH v5 0/2] add SW BOOST support for CPPC
On 30-05-20, 10:08, Xiongfeng Wang wrote: > ACPI spec 6.2 section 8.4.7.1 provide the following two CPC registers. > > "Highest performance is the absolute maximum performance an individual > processor may reach, assuming ideal conditions. This performance level > may not be sustainable for long durations, and may only be achievable if > other platform components are in a specific state; for example, it may > require other processors be in an idle state. > > Nominal Performance is the maximum sustained performance level of the > processor, assuming ideal operating conditions. In absence of an > external constraint (power, thermal, etc.) this is the performance level > the platform is expected to be able to maintain continuously. All > processors are expected to be able to sustain their nominal performance > state simultaneously." > > We can use Highest Performance as the max performance in boost mode and > Nomial Performance as the max performance in non-boost mode. If the > Highest Performance is greater than the Nominal Performance, we assume > SW BOOST is supported. > > Changelog: > > v4 -> v5: > add 'cpu_hotplug_lock' before calling '.set_boost' > v3 -> v4: > run 'boost_set_msr_each' for each CPU in the policy rather than > each CPU in the system for 'acpi-cpufreq' > add 'Suggested-by' > > Xiongfeng Wang (2): > cpufreq: change '.set_boost' to act on only one policy > CPPC: add support for SW BOOST > > drivers/cpufreq/acpi-cpufreq.c | 14 ++- > drivers/cpufreq/cppc_cpufreq.c | 39 +++-- > drivers/cpufreq/cpufreq.c | 57 > +++--- > include/linux/cpufreq.h| 2 +- > 4 files changed, 77 insertions(+), 35 deletions(-) Acked-by: Viresh Kumar -- viresh
[PATCH v5 0/2] add SW BOOST support for CPPC
ACPI spec 6.2 section 8.4.7.1 provide the following two CPC registers. "Highest performance is the absolute maximum performance an individual processor may reach, assuming ideal conditions. This performance level may not be sustainable for long durations, and may only be achievable if other platform components are in a specific state; for example, it may require other processors be in an idle state. Nominal Performance is the maximum sustained performance level of the processor, assuming ideal operating conditions. In absence of an external constraint (power, thermal, etc.) this is the performance level the platform is expected to be able to maintain continuously. All processors are expected to be able to sustain their nominal performance state simultaneously." We can use Highest Performance as the max performance in boost mode and Nomial Performance as the max performance in non-boost mode. If the Highest Performance is greater than the Nominal Performance, we assume SW BOOST is supported. Changelog: v4 -> v5: add 'cpu_hotplug_lock' before calling '.set_boost' v3 -> v4: run 'boost_set_msr_each' for each CPU in the policy rather than each CPU in the system for 'acpi-cpufreq' add 'Suggested-by' Xiongfeng Wang (2): cpufreq: change '.set_boost' to act on only one policy CPPC: add support for SW BOOST drivers/cpufreq/acpi-cpufreq.c | 14 ++- drivers/cpufreq/cppc_cpufreq.c | 39 +++-- drivers/cpufreq/cpufreq.c | 57 +++--- include/linux/cpufreq.h| 2 +- 4 files changed, 77 insertions(+), 35 deletions(-) -- 1.7.12.4
