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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 3/6] x86/intel_pstate: the main body of the intel_pstate driver
We simply grab the fundamental logic of the intel_pstate driver
from Linux kernel, and customize it to Xen style. In the kernel,
a user can adjust the limits via sysfs
(limits.min_sysfs_pct/max_sysfs_pct). In Xen, the
policy->limits.min_perf_pct/max_perf_pct acts as the transit
station. A user interacts with it via xenpm.
The new xen/include/asm-x86/cpufreq.h header file is added.
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
---
changes in v6:
1) change some of the unnecessary signed types to be unsigned, as requested by
Jan in v2;
2) remove "__ready_mostly" from the local variable, load, in
intel_pstate_init();
3) coding style changes.
xen/arch/x86/acpi/cpufreq/Makefile | 1 +
xen/arch/x86/acpi/cpufreq/intel_pstate.c | 882 +++++++++++++++++++++++++++++++
xen/include/acpi/cpufreq/cpufreq.h | 6 +
xen/include/asm-x86/cpufreq.h | 31 ++
xen/include/asm-x86/msr-index.h | 3 +
5 files changed, 923 insertions(+)
create mode 100644 xen/arch/x86/acpi/cpufreq/intel_pstate.c
create mode 100644 xen/include/asm-x86/cpufreq.h
diff --git a/xen/arch/x86/acpi/cpufreq/Makefile
b/xen/arch/x86/acpi/cpufreq/Makefile
index f75da9b..99fa9f4 100644
--- a/xen/arch/x86/acpi/cpufreq/Makefile
+++ b/xen/arch/x86/acpi/cpufreq/Makefile
@@ -1,2 +1,3 @@
obj-y += cpufreq.o
+obj-y += intel_pstate.o
obj-y += powernow.o
diff --git a/xen/arch/x86/acpi/cpufreq/intel_pstate.c
b/xen/arch/x86/acpi/cpufreq/intel_pstate.c
new file mode 100644
index 0000000..020abda
--- /dev/null
+++ b/xen/arch/x86/acpi/cpufreq/intel_pstate.c
@@ -0,0 +1,882 @@
+#include <xen/kernel.h>
+#include <xen/types.h>
+#include <xen/init.h>
+#include <xen/bitmap.h>
+#include <xen/cpumask.h>
+#include <xen/timer.h>
+#include <asm/msr.h>
+#include <asm/msr-index.h>
+#include <asm/processor.h>
+#include <asm/div64.h>
+#include <asm/cpufreq.h>
+#include <acpi/cpufreq/cpufreq.h>
+
+#define BYT_RATIOS 0x66a
+#define BYT_VIDS 0x66b
+#define BYT_TURBO_RATIOS 0x66c
+#define BYT_TURBO_VIDS 0x66d
+
+#define FRAC_BITS 8
+#define int_tofp(X) ((uint64_t)(X) << FRAC_BITS)
+#define fp_toint(X) ((X) >> FRAC_BITS)
+
+static inline uint32_t mul_fp(uint32_t x, uint32_t y)
+{
+ return ((uint64_t)x * (uint64_t)y) >> FRAC_BITS;
+}
+
+static inline uint32_t div_fp(uint32_t x, uint32_t y)
+{
+ return div_s64((uint64_t)x << FRAC_BITS, y);
+}
+
+static inline uint32_t ceiling_fp(uint32_t x)
+{
+ uint32_t mask, ret;
+
+ ret = fp_toint(x);
+ mask = (1 << FRAC_BITS) - 1;
+ if ( x & mask )
+ ret += 1;
+ return ret;
+}
+
+struct sample {
+ uint32_t core_pct_busy;
+ uint64_t aperf;
+ uint64_t mperf;
+ uint32_t freq;
+ s_time_t time;
+};
+
+struct pstate_data {
+ uint32_t current_pstate;
+ uint32_t min_pstate;
+ uint32_t max_pstate;
+ uint32_t scaling;
+ uint32_t turbo_pstate;
+};
+
+struct vid_data {
+ uint32_t min;
+ uint32_t max;
+ uint32_t turbo;
+ uint32_t ratio;
+};
+
+struct _pid {
+ uint32_t setpoint;
+ uint32_t integral;
+ uint32_t p_gain;
+ uint32_t i_gain;
+ uint32_t d_gain;
+ uint32_t deadband;
+ int32_t last_err;
+};
+
+struct cpudata {
+ int cpu;
+
+ struct timer timer;
+
+ struct pstate_data pstate;
+ struct vid_data vid;
+ struct _pid pid;
+
+ s_time_t last_sample_time;
+ uint64_t prev_aperf;
+ uint64_t prev_mperf;
+ struct sample sample;
+};
+
+static struct cpudata **all_cpu_data;
+
+struct pstate_adjust_policy {
+ uint32_t sample_rate_ms;
+ uint32_t deadband;
+ uint32_t setpoint;
+ uint32_t p_gain_pct;
+ uint32_t d_gain_pct;
+ uint32_t i_gain_pct;
+};
+
+struct pstate_funcs {
+ uint32_t (*get_max)(void);
+ uint32_t (*get_min)(void);
+ uint32_t (*get_turbo)(void);
+ uint32_t (*get_scaling)(void);
+ void (*set)(struct perf_limits *, struct cpudata *, uint32_t pstate);
+ void (*get_vid)(struct cpudata *);
+};
+
+struct cpu_defaults {
+ struct pstate_adjust_policy pid_policy;
+ struct pstate_funcs funcs;
+};
+
+static struct pstate_adjust_policy pid_params;
+static struct pstate_funcs pstate_funcs;
+
+static inline void pid_reset(struct _pid *pid, uint32_t setpoint,
+ uint32_t busy, uint32_t deadband,
+ uint32_t integral)
+{
+ pid->setpoint = setpoint;
+ pid->deadband = deadband;
+ pid->integral = int_tofp(integral);
+ pid->last_err = int_tofp(setpoint) - int_tofp(busy);
+}
+
+static inline void pid_p_gain_set(struct _pid *pid, uint32_t percent)
+{
+ pid->p_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static inline void pid_i_gain_set(struct _pid *pid, uint32_t percent)
+{
+ pid->i_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static inline void pid_d_gain_set(struct _pid *pid, uint32_t percent)
+{
+ pid->d_gain = div_fp(int_tofp(percent), int_tofp(100));
+}
+
+static signed int pid_calc(struct _pid *pid, uint32_t busy)
+{
+ signed int result;
+ int32_t pterm, dterm, fp_error;
+ int32_t integral_limit;
+
+ fp_error = int_tofp(pid->setpoint) - busy;
+
+ if ( ABS(fp_error) <= int_tofp(pid->deadband) )
+ return 0;
+
+ pterm = mul_fp(pid->p_gain, fp_error);
+
+ pid->integral += fp_error;
+
+ /*
+ * We limit the integral here so that it will never
+ * get higher than 30. This prevents it from becoming
+ * too large an input over long periods of time and allows
+ * it to get factored out sooner.
+ * The value of 30 was chosen through experimentation.
+ */
+ integral_limit = int_tofp(30);
+ if ( pid->integral > integral_limit )
+ pid->integral = integral_limit;
+ if ( pid->integral < -integral_limit )
+ pid->integral = -integral_limit;
+
+ dterm = mul_fp(pid->d_gain, fp_error - pid->last_err);
+ pid->last_err = fp_error;
+
+ result = pterm + mul_fp(pid->integral, pid->i_gain) + dterm;
+ result = result + (1 << (FRAC_BITS-1));
+ return (signed int)fp_toint(result);
+}
+
+static inline void intel_pstate_busy_pid_reset(struct cpudata *cpu)
+{
+ pid_p_gain_set(&cpu->pid, pid_params.p_gain_pct);
+ pid_d_gain_set(&cpu->pid, pid_params.d_gain_pct);
+ pid_i_gain_set(&cpu->pid, pid_params.i_gain_pct);
+
+ pid_reset(&cpu->pid, pid_params.setpoint, 100, pid_params.deadband, 0);
+}
+
+static inline void intel_pstate_reset_all_pid(void)
+{
+ uint32_t cpu;
+
+ for_each_online_cpu(cpu)
+ {
+ if ( all_cpu_data[cpu] )
+ intel_pstate_busy_pid_reset(all_cpu_data[cpu]);
+ }
+}
+
+static inline void update_turbo_state(struct cpufreq_policy *policy)
+{
+ uint64_t misc_en;
+ struct cpudata *cpu;
+
+ cpu = all_cpu_data[policy->cpu];
+ rdmsrl(MSR_IA32_MISC_ENABLE, misc_en);
+ policy->limits.turbo_disabled =
+ (misc_en & MSR_IA32_MISC_ENABLE_TURBO_DISABLE ||
+ cpu->pstate.max_pstate == cpu->pstate.turbo_pstate);
+}
+
+#define BYT_TURBO_CONTROL_BIT 32
+#define BYT_MIN_PSTATE(val) (((value) >> 8) & 0x7f)
+#define BYT_MAX_PSTATE(val) (((value) >> 16) & 0x7f)
+#define BYT_TURBO_PSTATE(value) ((value) & 0x7f)
+static uint32_t byt_get_min_pstate(void)
+{
+ uint64_t value;
+
+ rdmsrl(BYT_RATIOS, value);
+ return BYT_MIN_PSTATE(val);
+}
+
+static uint32_t byt_get_max_pstate(void)
+{
+ uint64_t value;
+
+ rdmsrl(BYT_RATIOS, value);
+ return BYT_MAX_PSTATE(val);
+}
+
+static uint32_t byt_get_turbo_pstate(void)
+{
+ uint64_t value;
+
+ rdmsrl(BYT_TURBO_RATIOS, value);
+ return BYT_TURBO_PSTATE(value);
+}
+
+static void byt_set_pstate(struct perf_limits *limits,
+ struct cpudata *cpudata, uint32_t pstate)
+{
+ uint64_t val;
+ uint32_t vid_fp;
+ uint32_t vid;
+
+ val = pstate << 8;
+ if ( limits->no_turbo && !limits->turbo_disabled )
+ val |= (uint64_t)1 << BYT_TURBO_CONTROL_BIT;
+
+ vid_fp = cpudata->vid.min + mul_fp(
+ int_tofp(pstate - cpudata->pstate.min_pstate),
+ cpudata->vid.ratio);
+
+ vid_fp = clamp(vid_fp, cpudata->vid.min, cpudata->vid.max);
+ vid = ceiling_fp(vid_fp);
+
+ if ( pstate > cpudata->pstate.max_pstate )
+ vid = cpudata->vid.turbo;
+
+ val |= vid;
+
+ wrmsrl(MSR_IA32_PERF_CTL, val);
+}
+
+#define BYT_BCLK_FREQS 5
+#define TO_FREQ_TABLE_IDX_MASK 0x7
+static uint32_t byt_get_scaling(void)
+{
+ const uint32_t byt_freq_table[BYT_BCLK_FREQS] =
+ {833, 1000, 1333, 1167, 800};
+ uint64_t value;
+ int i;
+
+ rdmsrl(MSR_FSB_FREQ, value);
+ i = value & TO_FREQ_TABLE_IDX_MASK;
+
+ BUG_ON(i > BYT_BCLK_FREQS);
+
+ return byt_freq_table[i] * 100;
+}
+
+static void byt_get_vid(struct cpudata *cpudata)
+{
+ uint64_t value;
+
+ rdmsrl(BYT_VIDS, value);
+ cpudata->vid.min = int_tofp(BYT_MIN_PSTATE(val));
+ cpudata->vid.max = int_tofp(BYT_MAX_PSTATE(val));
+ cpudata->vid.ratio = div_fp(cpudata->vid.max -
+ cpudata->vid.min,
+ int_tofp(cpudata->pstate.max_pstate -
+ cpudata->pstate.min_pstate));
+ rdmsrl(BYT_TURBO_VIDS, value);
+ cpudata->vid.turbo = BYT_TURBO_PSTATE(value);
+}
+
+#define SCALING_FACTOR 100000
+#define CORE_TURBO_CONTROL_BIT 32
+#define CORE_MIN_PSTATE(val) (((value) >> 40) & 0xff)
+#define CORE_MAX_PSTATE(val) (((value) >> 8) & 0xff)
+#define CORE_TURBO_PSTATE(value) ((value) & 0xff)
+static uint32_t core_get_min_pstate(void)
+{
+ uint64_t value;
+
+ rdmsrl(MSR_INTEL_PLATFORM_INFO, value);
+ return CORE_MIN_PSTATE(val);
+}
+
+static uint32_t core_get_max_pstate(void)
+{
+ uint64_t value;
+
+ rdmsrl(MSR_INTEL_PLATFORM_INFO, value);
+ return CORE_MAX_PSTATE(val);
+}
+
+static uint32_t core_get_turbo_pstate(void)
+{
+ uint64_t value;
+ uint32_t nont, ret;
+
+ rdmsrl(MSR_NHM_TURBO_RATIO_LIMIT, value);
+ nont = core_get_max_pstate();
+ ret = CORE_TURBO_PSTATE(value);
+ if ( ret <= nont )
+ ret = nont;
+ return ret;
+}
+
+static inline uint32_t core_get_scaling(void)
+{
+ return SCALING_FACTOR;
+}
+
+static void core_set_pstate(struct perf_limits *limits,
+ struct cpudata *cpudata, uint32_t pstate)
+{
+ uint64_t val;
+
+ val = pstate << 8;
+ if ( limits->no_turbo && !limits->turbo_disabled )
+ val |= (uint64_t)1 << CORE_TURBO_CONTROL_BIT;
+
+ wrmsrl(MSR_IA32_PERF_CTL, val);
+}
+
+static __initconst struct cpu_defaults core_params = {
+ .pid_policy = {
+ .sample_rate_ms = 10,
+ .deadband = 0,
+ .setpoint = 97,
+ .p_gain_pct = 20,
+ .d_gain_pct = 0,
+ .i_gain_pct = 0,
+ },
+ .funcs = {
+ .get_max = core_get_max_pstate,
+ .get_min = core_get_min_pstate,
+ .get_turbo = core_get_turbo_pstate,
+ .get_scaling = core_get_scaling,
+ .set = core_set_pstate,
+ },
+};
+
+static __initconst struct cpu_defaults byt_params = {
+ .pid_policy = {
+ .sample_rate_ms = 10,
+ .deadband = 0,
+ .setpoint = 97,
+ .p_gain_pct = 14,
+ .d_gain_pct = 0,
+ .i_gain_pct = 4,
+ },
+ .funcs = {
+ .get_max = byt_get_max_pstate,
+ .get_min = byt_get_min_pstate,
+ .get_turbo = byt_get_turbo_pstate,
+ .set = byt_set_pstate,
+ .get_scaling = byt_get_scaling,
+ .get_vid = byt_get_vid,
+ },
+};
+
+static void intel_pstate_get_min_max(struct perf_limits *limits,
+ struct cpudata *cpu, uint32_t *min,
+ uint32_t *max)
+{
+ uint32_t max_perf = cpu->pstate.turbo_pstate;
+ uint32_t max_perf_adj;
+ uint32_t min_perf;
+
+ if ( limits->no_turbo || limits->turbo_disabled )
+ max_perf = cpu->pstate.max_pstate;
+
+ /* performance can be limited by user through xenpm */
+ max_perf_adj = fp_toint(mul_fp(int_tofp(max_perf), limits->max_perf));
+ *max = clamp(max_perf_adj, cpu->pstate.min_pstate,
+ cpu->pstate.turbo_pstate);
+ min_perf = fp_toint(mul_fp(int_tofp(max_perf), limits->min_perf));
+ *min = clamp(min_perf, cpu->pstate.min_pstate, max_perf);
+}
+
+static void intel_pstate_set_pstate(struct cpufreq_policy *policy,
+ struct cpudata *cpu, uint32_t pstate)
+{
+ uint32_t max_perf, min_perf;
+ struct perf_limits *limits;
+
+ limits = &policy->limits;
+
+ update_turbo_state(policy);
+
+ if ( limits->turbo_disabled )
+ policy->turbo = CPUFREQ_TURBO_UNSUPPORTED;
+ else if ( limits->no_turbo )
+ policy->turbo = CPUFREQ_TURBO_DISABLED;
+ else
+ policy->turbo = CPUFREQ_TURBO_ENABLED;
+
+ intel_pstate_get_min_max(limits, cpu, &min_perf, &max_perf);
+
+ pstate = clamp(pstate, min_perf, max_perf);
+
+ if ( pstate == cpu->pstate.current_pstate )
+ return;
+
+ cpu->pstate.current_pstate = pstate;
+ policy->cur = pstate * SCALING_FACTOR;
+
+ pstate_funcs.set(limits, cpu, pstate);
+}
+
+static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
+{
+ struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_policy, cpu->cpu);
+
+ cpu->pstate.min_pstate = pstate_funcs.get_min();
+ cpu->pstate.max_pstate = pstate_funcs.get_max();
+ cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
+ cpu->pstate.scaling = pstate_funcs.get_scaling();
+
+ if ( pstate_funcs.get_vid )
+ pstate_funcs.get_vid(cpu);
+ intel_pstate_set_pstate(policy, cpu, cpu->pstate.min_pstate);
+}
+
+static inline void intel_pstate_calc_busy(struct cpudata *cpu)
+{
+ struct sample *sample = &cpu->sample;
+ uint64_t core_pct;
+
+ core_pct = int_tofp(sample->aperf) * int_tofp(100);
+ core_pct = div64_u64(core_pct, int_tofp(sample->mperf));
+
+ sample->freq = fp_toint(mul_fp(int_tofp(cpu->pstate.max_pstate *
+ cpu->pstate.scaling / 100), core_pct));
+
+ sample->core_pct_busy = (int32_t)core_pct;
+}
+
+static inline void intel_pstate_sample(struct cpudata *cpu)
+{
+ uint64_t aperf, mperf;
+ unsigned long flags;
+
+ local_irq_save(flags);
+ rdmsrl(MSR_IA32_APERF, aperf);
+ rdmsrl(MSR_IA32_MPERF, mperf);
+ local_irq_restore(flags);
+
+ cpu->last_sample_time = cpu->sample.time;
+ cpu->sample.time = get_s_time();
+ cpu->sample.aperf = aperf;
+ cpu->sample.mperf = mperf;
+ cpu->sample.aperf -= cpu->prev_aperf;
+ cpu->sample.mperf -= cpu->prev_mperf;
+
+ intel_pstate_calc_busy(cpu);
+
+ cpu->prev_aperf = aperf;
+ cpu->prev_mperf = mperf;
+}
+
+static inline void intel_pstate_set_sample_time(struct cpudata *cpu)
+{
+ set_timer(&cpu->timer, NOW() + MILLISECS(pid_params.sample_rate_ms));
+}
+
+static inline int32_t intel_pstate_get_scaled_busy(struct cpudata *cpu)
+{
+ uint32_t core_busy, max_pstate, current_pstate, sample_ratio;
+ uint32_t duration_us;
+ uint32_t sample_time_us;
+
+ /*
+ * core_busy is the ratio of actual performance to max
+ * max_pstate is the max non turbo pstate available
+ * current_pstate was the pstate that was requested during
+ * the last sample period.
+ *
+ * We normalize core_busy, which was our actual percent
+ * performance to what we requested during the last sample
+ * period. The result will be a percentage of busy at a
+ * specified pstate.
+ */
+ core_busy = cpu->sample.core_pct_busy;
+ max_pstate = int_tofp(cpu->pstate.max_pstate);
+ current_pstate = int_tofp(cpu->pstate.current_pstate);
+ core_busy = mul_fp(core_busy, div_fp(max_pstate, current_pstate));
+
+ /*
+ * Since we have a deferred timer, it will not fire unless
+ * we are in C0. So, determine if the actual elapsed time
+ * is significantly greater (3x) than our sample interval. If it
+ * is, then we were idle for a long enough period of time
+ * to adjust our busyness.
+ */
+ sample_time_us = pid_params.sample_rate_ms * 1000ULL;
+ duration_us = (uint32_t)((s_time_t)(cpu->sample.time -
+ cpu->last_sample_time) / 1000);
+ if ( duration_us > sample_time_us * 3 )
+ {
+ sample_ratio = div_fp(int_tofp(sample_time_us),
+ int_tofp(duration_us));
+ core_busy = mul_fp(core_busy, sample_ratio);
+ }
+
+ return core_busy;
+}
+
+static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
+{
+ int32_t busy_scaled;
+ struct _pid *pid;
+ signed int ctl;
+ struct cpufreq_policy *policy = per_cpu(cpufreq_cpu_policy, cpu->cpu);
+
+ pid = &cpu->pid;
+ busy_scaled = intel_pstate_get_scaled_busy(cpu);
+
+ ctl = pid_calc(pid, busy_scaled);
+
+ /* Negative values of ctl increase the pstate and vice versa */
+ intel_pstate_set_pstate(policy, cpu, cpu->pstate.current_pstate - ctl);
+}
+
+static void intel_pstate_timer_func(void *data)
+{
+ struct cpudata *cpu = (struct cpudata *) data;
+
+ intel_pstate_sample(cpu);
+
+ intel_pstate_adjust_busy_pstate(cpu);
+
+ intel_pstate_set_sample_time(cpu);
+}
+
+#define ICPU(model, policy) \
+ { X86_VENDOR_INTEL, 6, model, X86_FEATURE_APERFMPERF,\
+ &policy##_params }
+
+static __initconst struct x86_cpu_id intel_pstate_cpu_ids[] __initconst = {
+ ICPU(0x2a, core),
+ ICPU(0x2d, core),
+ ICPU(0x37, byt),
+ ICPU(0x3a, core),
+ ICPU(0x3c, core),
+ ICPU(0x3d, core),
+ ICPU(0x3e, core),
+ ICPU(0x3f, core),
+ ICPU(0x45, core),
+ ICPU(0x46, core),
+ ICPU(0x47, core),
+ ICPU(0x4c, byt),
+ ICPU(0x4e, core),
+ ICPU(0x4f, core),
+ ICPU(0x56, core),
+ {}
+};
+
+static int intel_pstate_init_cpu(unsigned int cpunum)
+{
+ struct cpudata *cpu;
+ s_time_t expires;
+
+ if ( !all_cpu_data[cpunum] )
+ all_cpu_data[cpunum] = xzalloc(struct cpudata);
+ if ( !all_cpu_data[cpunum] )
+ return -ENOMEM;
+
+ cpu = all_cpu_data[cpunum];
+
+ cpu->cpu = cpunum;
+ intel_pstate_get_cpu_pstates(cpu);
+
+ init_timer(&cpu->timer, intel_pstate_timer_func, cpu, cpunum);
+ expires = NOW() + MILLISECS(10);
+
+ intel_pstate_busy_pid_reset(cpu);
+ intel_pstate_sample(cpu);
+
+ set_timer(&cpu->timer, expires);
+
+ return 0;
+}
+
+static int intel_pstate_set_policy(struct cpufreq_policy *policy)
+{
+ struct perf_limits *limits = &policy->limits;
+ uint32_t cur_gov = policy->internal_gov->cur_gov;
+
+ if ( !policy->cpuinfo.max_freq )
+ return -ENODEV;
+
+ switch ( cur_gov )
+ {
+ case INTERNAL_GOV_PERFORMANCE:
+ limits->no_turbo = 0;
+ limits->max_perf_pct = 100;
+ limits->max_perf = int_tofp(1);
+ limits->min_perf_pct = 100;
+ limits->min_perf = int_tofp(1);
+ break;
+ case INTERNAL_GOV_POWERSAVE:
+ limits->min_perf = div_fp(int_tofp(limits->min_policy_pct),
+ int_tofp(100));
+ limits->max_perf = limits->min_perf;
+ limits->min_perf_pct = limits->min_policy_pct;
+ limits->max_perf_pct = limits->min_perf_pct;
+ break;
+ case INTERNAL_GOV_USERSPACE:
+ limits->max_perf = div_fp(int_tofp(limits->max_perf_pct),
+ int_tofp(100));
+ limits->min_perf = limits->max_perf;
+ limits->min_perf_pct = limits->max_perf_pct;
+ break;
+ case INTERNAL_GOV_ONDEMAND:
+ default:
+ limits->min_perf = div_fp(int_tofp(limits->min_perf_pct),
+ int_tofp(100));
+ limits->max_perf = div_fp(int_tofp(limits->max_perf_pct),
+ int_tofp(100));
+ cur_gov = INTERNAL_GOV_ONDEMAND;
+ break;
+ }
+
+ return 0;
+}
+
+static int intel_pstate_verify_policy(struct cpufreq_policy *policy)
+{
+ uint32_t cur_gov = policy->internal_gov->cur_gov;
+
+ cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ switch( cur_gov )
+ {
+ case INTERNAL_GOV_PERFORMANCE:
+ case INTERNAL_GOV_POWERSAVE:
+ case INTERNAL_GOV_USERSPACE:
+ case INTERNAL_GOV_ONDEMAND:
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static void intel_pstate_internal_gov_release(struct internal_governor *gov)
+{
+ xfree(gov->avail_gov);
+ xfree(gov);
+}
+
+static int intel_pstate_cpu_exit(struct cpufreq_policy *policy)
+{
+ int cpu_num = policy->cpu;
+ struct cpudata *cpu = all_cpu_data[cpu_num];
+
+ kill_timer(&all_cpu_data[cpu_num]->timer);
+
+ intel_pstate_set_pstate(policy, cpu, cpu->pstate.min_pstate);
+
+ intel_pstate_internal_gov_release(policy->internal_gov);
+
+ return 0;
+}
+
+static int intel_pstate_turbo_update(int cpuid, struct cpufreq_policy *policy)
+{
+ struct cpudata *cpu = all_cpu_data[policy->cpu];
+ struct perf_limits *limits = &policy->limits;
+
+ update_turbo_state(policy);
+ if ( limits->turbo_disabled )
+ {
+ printk("Turbo disabled by BIOS or not supported on CPU\n");
+ return -EINVAL;
+ }
+ limits->no_turbo = policy->turbo == CPUFREQ_TURBO_ENABLED ? 0 : 1;
+
+ if ( limits->no_turbo )
+ policy->cpuinfo.max_freq = cpu->pstate.max_pstate *
+ cpu->pstate.scaling;
+ else
+ policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate *
+ cpu->pstate.scaling;
+
+ policy->max = clamp(policy->max, policy->cpuinfo.min_freq,
+ policy->cpuinfo.max_freq);
+
+ return 0;
+}
+
+static uint32_t get_turbo_pct(struct cpudata *cpu)
+{
+ uint32_t total, no_turbo, turbo_pct;
+ uint32_t turbo_fp;
+
+ total = cpu->pstate.turbo_pstate - cpu->pstate.min_pstate + 1;
+ no_turbo = cpu->pstate.max_pstate - cpu->pstate.min_pstate + 1;
+ turbo_fp = div_fp(int_tofp(no_turbo), int_tofp(total));
+ turbo_pct = 100 - fp_toint(mul_fp(turbo_fp, int_tofp(100)));
+ return turbo_pct;
+}
+
+#define INTEL_PSTATE_GOV_NUM 4
+static struct internal_governor* intel_pstate_internal_gov_init(void)
+{
+ unsigned int i = 0;
+ struct internal_governor *gov;
+ char *avail_gov;
+
+ gov = xzalloc(struct internal_governor);
+ if ( !gov )
+ return NULL;
+ avail_gov = xzalloc_array(char,
+ INTEL_PSTATE_GOV_NUM * CPUFREQ_NAME_LEN);
+ if ( !avail_gov )
+ return NULL;
+
+ gov->avail_gov = avail_gov;
+
+ i += scnprintf(&avail_gov[0], CPUFREQ_NAME_LEN, "%s ", "performance");
+ i += scnprintf(&avail_gov[i], CPUFREQ_NAME_LEN, "%s ", "powersave");
+ i += scnprintf(&avail_gov[i], CPUFREQ_NAME_LEN, "%s ", "userspace");
+ i += scnprintf(&avail_gov[i], CPUFREQ_NAME_LEN, "%s ", "ondemand");
+ avail_gov[i-1] = '\0';
+ gov->gov_num = INTEL_PSTATE_GOV_NUM;
+ gov->cur_gov = INTERNAL_GOV_ONDEMAND;
+ return gov;
+}
+
+static int intel_pstate_cpu_setup(struct cpufreq_policy *policy)
+{
+ struct cpudata *cpu;
+ struct perf_limits *limits = &policy->limits;
+ int rc;
+
+ rc = intel_pstate_init_cpu(policy->cpu);
+ if ( rc )
+ return rc;
+
+ policy->internal_gov = intel_pstate_internal_gov_init();
+ if ( !policy->internal_gov )
+ return -ENOMEM;
+
+ cpu = all_cpu_data[policy->cpu];
+ policy->min = cpu->pstate.min_pstate * cpu->pstate.scaling;
+ policy->max = cpu->pstate.turbo_pstate * cpu->pstate.scaling;
+
+ /* cpuinfo and default policy values */
+ policy->cpuinfo.min_freq = cpu->pstate.min_pstate *
+ cpu->pstate.scaling;
+ policy->cpuinfo.max_freq = cpu->pstate.turbo_pstate *
+ cpu->pstate.scaling;
+ policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+ cpumask_set_cpu(policy->cpu, policy->cpus);
+
+ limits->no_turbo = 0;
+ limits->turbo_disabled = 0;
+ limits->turbo_pct = get_turbo_pct(cpu);
+ limits->min_policy_pct = (policy->min * 100) /
+ policy->cpuinfo.max_freq;
+ limits->min_policy_pct = clamp_t(uint32_t,
+ limits->min_policy_pct, 0, 100);
+ limits->max_policy_pct = (policy->max * 100) /
+ policy->cpuinfo.max_freq;
+ limits->max_policy_pct = clamp_t(uint32_t,
+ limits->max_policy_pct, 0, 100);
+ limits->max_perf_pct = limits->max_policy_pct;
+ limits->min_perf_pct = limits->min_policy_pct;
+
+ return 0;
+}
+
+static struct cpufreq_driver intel_pstate_driver = {
+ .verify = intel_pstate_verify_policy,
+ .setpolicy = intel_pstate_set_policy,
+ .init = intel_pstate_cpu_setup,
+ .exit = intel_pstate_cpu_exit,
+ .update = intel_pstate_turbo_update,
+ .name = "intel_pstate",
+};
+
+static int intel_pstate_msrs_not_valid(void)
+{
+ if ( !pstate_funcs.get_max() ||
+ !pstate_funcs.get_min() ||
+ !pstate_funcs.get_turbo() )
+ return -ENODEV;
+
+ return 0;
+}
+
+static void __init copy_pid_params(struct pstate_adjust_policy *policy)
+{
+ pid_params.sample_rate_ms = policy->sample_rate_ms;
+ pid_params.p_gain_pct = policy->p_gain_pct;
+ pid_params.i_gain_pct = policy->i_gain_pct;
+ pid_params.d_gain_pct = policy->d_gain_pct;
+ pid_params.deadband = policy->deadband;
+ pid_params.setpoint = policy->setpoint;
+}
+
+static void __init copy_cpu_funcs(struct pstate_funcs *funcs)
+{
+ pstate_funcs.get_max = funcs->get_max;
+ pstate_funcs.get_min = funcs->get_min;
+ pstate_funcs.get_turbo = funcs->get_turbo;
+ pstate_funcs.get_scaling = funcs->get_scaling;
+ pstate_funcs.set = funcs->set;
+ pstate_funcs.get_vid = funcs->get_vid;
+}
+
+int __init intel_pstate_init(void)
+{
+ int cpu, rc = 0;
+ const struct x86_cpu_id *id;
+ struct cpu_defaults *cpu_info;
+ static bool_t load;
+ boolean_param("intel_pstate", load);
+
+ if ( !load )
+ return -ENODEV;
+
+ 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);
+ copy_cpu_funcs(&cpu_info->funcs);
+
+ if ( intel_pstate_msrs_not_valid() )
+ return -ENODEV;
+
+ all_cpu_data = xzalloc_array(struct cpudata *, NR_CPUS);
+ if ( !all_cpu_data )
+ return -ENOMEM;
+
+ rc = cpufreq_register_driver(&intel_pstate_driver);
+ if ( rc )
+ goto out;
+
+ return rc;
+out:
+ for_each_online_cpu(cpu)
+ {
+ if ( all_cpu_data[cpu] )
+ {
+ kill_timer(&all_cpu_data[cpu]->timer);
+ xfree(all_cpu_data[cpu]);
+ }
+ }
+ xfree(all_cpu_data);
+ return -ENODEV;
+}
diff --git a/xen/include/acpi/cpufreq/cpufreq.h
b/xen/include/acpi/cpufreq/cpufreq.h
index 8947368..ef6643a 100644
--- a/xen/include/acpi/cpufreq/cpufreq.h
+++ b/xen/include/acpi/cpufreq/cpufreq.h
@@ -107,6 +107,12 @@ struct cpufreq_freqs {
* CPUFREQ GOVERNORS *
*********************************************************************/
+/* Please add internal governors here */
+#define INTERNAL_GOV_POWERSAVE (1)
+#define INTERNAL_GOV_PERFORMANCE (2)
+#define INTERNAL_GOV_USERSPACE (3)
+#define INTERNAL_GOV_ONDEMAND (4)
+
#define CPUFREQ_GOV_START 1
#define CPUFREQ_GOV_STOP 2
#define CPUFREQ_GOV_LIMITS 3
diff --git a/xen/include/asm-x86/cpufreq.h b/xen/include/asm-x86/cpufreq.h
new file mode 100644
index 0000000..afc72df
--- /dev/null
+++ b/xen/include/asm-x86/cpufreq.h
@@ -0,0 +1,31 @@
+#ifndef _ASM_X86_CPUFREQ_H
+#define _ASM_X86_CPUFREQ_H
+
+/*
+ * Copyright (C) 2015, Intel Corporation.
+ * Wei Wang <wei.w.wang@xxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; If not, see <http://www.gnu.org/licenses/>.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+/*
+ * Maximum transition latency is in nanoseconds - if it's unknown,
+ * CPUFREQ_ETERNAL shall be used.
+ */
+#define CPUFREQ_ETERNAL (-1)
+
+#endif /* _ASM_X86_CPUFREQ_H */
diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h
index 65c1d02..b9c4595 100644
--- a/xen/include/asm-x86/msr-index.h
+++ b/xen/include/asm-x86/msr-index.h
@@ -52,6 +52,8 @@
#define MSR_IA32_MCG_STATUS 0x0000017a
#define MSR_IA32_MCG_CTL 0x0000017b
+#define MSR_NHM_TURBO_RATIO_LIMIT 0x000001ad
+
#define MSR_IA32_PEBS_ENABLE 0x000003f1
#define MSR_IA32_DS_AREA 0x00000600
#define MSR_IA32_PERF_CAPABILITIES 0x00000345
@@ -320,6 +322,7 @@
#define MSR_IA32_MISC_ENABLE_MONITOR_ENABLE (1<<18)
#define MSR_IA32_MISC_ENABLE_LIMIT_CPUID (1<<22)
#define MSR_IA32_MISC_ENABLE_XTPR_DISABLE (1<<23)
+#define MSR_IA32_MISC_ENABLE_TURBO_DISABLE (1ULL<<38)
#define MSR_IA32_TSC_DEADLINE 0x000006E0
#define MSR_IA32_ENERGY_PERF_BIAS 0x000001b0
--
1.9.1
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