The intel_pstate driver is ported following its kernel code logic
(commit: 93f0822d).
In the kernel, a user can adjust the limits via sysfs
(limits.min_sysfs_pct/max_sysfs_pct). In Xen, the
policy->min_perf_pct/max_perf_pct acts as the transit station.
A user interacts with it via xenpm.
Signed-o
On 29/05/2015 16:46, Jan Beulich wrote
> >>> On 29.05.15 at 10:19, wrote:
> > On 26/05/2015 21:58, Jan Beulich wrote
> >> >>> On 13.05.16 at 09:50, wrote:
> >> > +static int intel_pstate_verify_policy(struct cpufreq_policy
> >> > +*policy) {
> >> > +cpufreq_verify_within_limits(policy, policy
>>> On 01.06.15 at 11:12, wrote:
> On 29/05/2015 16:46, Jan Beulich wrote
>> >>> On 29.05.15 at 10:19, wrote:
>> > On 26/05/2015 21:58, Jan Beulich wrote
>> >> >>> On 13.05.16 at 09:50, wrote:
>> >> > +static int intel_pstate_verify_policy(struct cpufreq_policy
>> >> > +*policy) {
>> >> > +c
On 26/05/2015 21:58, Jan Beulich wrote
> >>> On 13.05.16 at 09:50, wrote:
> > +id = x86_match_cpu(intel_pstate_cpu_ids);
> > +if (!id)
> > +return -ENODEV;
> > +
> > +cpu_info = (struct cpu_defaults *)id->driver_data;
> > +
> > +copy_pid_params(&cpu_info->pid_policy);
> > +
>>> On 02.06.15 at 05:23, wrote:
> On 26/05/2015 21:58, Jan Beulich wrote
>> >>> On 13.05.16 at 09:50, wrote:
>> > +id = x86_match_cpu(intel_pstate_cpu_ids);
>> > +if (!id)
>> > +return -ENODEV;
>> > +
>> > +cpu_info = (struct cpu_defaults *)id->driver_data;
>> > +
>> > +c
On 26/05/2015 21:58, Jan Beulich wrote
> >>> On 13.05.16 at 09:50, wrote:
> > +static int byt_get_min_pstate(void)
> > +{
> > +u64 value;
> > +
> > +rdmsrl(BYT_RATIOS, value);
> > +return (value >> 8) & 0x7F;
> > +}
> > +
> > +static int byt_get_max_pstate(void)
> > +{
> > +u64 val
>>> On 08.06.15 at 03:47, wrote:
> On 26/05/2015 21:58, Jan Beulich wrote
>> >>> On 13.05.16 at 09:50, wrote:
>> > +static int byt_get_min_pstate(void)
>> > +{
>> > +u64 value;
>> > +
>> > +rdmsrl(BYT_RATIOS, value);
>> > +return (value >> 8) & 0x7F;
>> > +}
>> > +
>> > +static int by
On 08/06/2015 14:50, Jan Beulich wrote:
> >>> On 08.06.15 at 03:47, wrote:
> > On 26/05/2015 21:58, Jan Beulich wrote
> >> >>> On 13.05.16 at 09:50, wrote:
> >> > +static int byt_get_min_pstate(void) {
> >> > +u64 value;
> >> > +
> >> > +rdmsrl(BYT_RATIOS, value);
> >> > +return (valu
>>> On 08.06.15 at 10:18, wrote:
> Regarding the self-documenting related comment here, which of the following
> do you think is better?
> 1)
> #define BYT_MIN_PSTATE_SHIFT8
> #define BYT_MAX_PSTATE_SHIFT 16
> #define BYT_PSTATE_MASK 0x7f
> #define BYT
On 26/05/2015 21:58, Jan Beulich wrote
> >>> On 13.05.16 at 09:50, wrote:
> > +if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
> > +limits.no_turbo = 0;
> > +limits.max_perf_pct = 100;
> > +limits.max_perf = int_tofp(1);
> > +limits.min_perf_pct = 100;
> > +
>>> On 10.06.15 at 07:20, wrote:
> On 26/05/2015 21:58, Jan Beulich wrote
>> >>> On 13.05.16 at 09:50, wrote:
>> > +if (policy->policy == CPUFREQ_POLICY_PERFORMANCE) {
>> > +limits.no_turbo = 0;
>> > +limits.max_perf_pct = 100;
>> > +limits.max_perf = int_tofp(1);
>> >
>>> On 13.05.16 at 09:50, wrote:
> +static inline int ceiling_fp(int32_t x)
> +{
> +int mask, ret;
Please here and below, consider whether types really need to be
signed. One exception: If you intend to import the Linux source file
with minimal modifications, and if that indeed results in onl
On 26/05/2015 21:58, Jan Beulich wrote
> >>> On 13.05.16 at 09:50, wrote:
> > +static inline int ceiling_fp(int32_t x) {
> > +int mask, ret;
>
> Please here and below, consider whether types really need to be signed.
> One exception: If you intend to import the Linux source file with minimal
>>> On 29.05.15 at 10:19, wrote:
> On 26/05/2015 21:58, Jan Beulich wrote
>> >>> On 13.05.16 at 09:50, wrote:
>> > +static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
>> > +{
>> > +cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
>> > +
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