Messages in this thread | | | Date | Mon, 17 Oct 2022 17:47:13 +0800 | From | Huang Rui <> | Subject | Re: [RESEND PATCH V2 2/9] cpufreq: amd_pstate: add module parameter to load amd pstate EPP driver |
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On Tue, Oct 11, 2022 at 12:22:41AM +0800, Yuan, Perry wrote: > The amd_pstate mode parameter will allow user to select which amd pstate > working mode as booting mode, amd_pstate instance or amd_pstate_epp instance. > > 1) amd_pstate instance is depending on the target operation mode. > 2) amd_pstate_epp instance is depending on the set_policy operation mode.It > is also called active mode that AMD SMU has EPP algorithm to control the > CPU runtime frequency according to the EPP set value and workload. >
There is one concern here: how can the user know which kind of processor supports the EPP function in hardware?
Thanks, Ray
> Signed-off-by: Perry Yuan <Perry.Yuan@amd.com> > --- > drivers/cpufreq/amd-pstate.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c > index f52b8f2fe529..2d28f458589c 100644 > --- a/drivers/cpufreq/amd-pstate.c > +++ b/drivers/cpufreq/amd-pstate.c > @@ -63,6 +63,10 @@ module_param(shared_mem, bool, 0444); > MODULE_PARM_DESC(shared_mem, > "enable amd-pstate on processors with shared memory solution (false = disabled (default), true = enabled)"); > > +static bool epp = false; > +module_param(epp, bool, 0444); > +MODULE_PARM_DESC(epp, "Enable energy performance preference (EPP) control"); > + > static struct cpufreq_driver amd_pstate_driver; > > /** > -- > 2.34.1 >
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