Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / drivers / cpufreq / intel_pstate.c

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index d51f17e..7e257b2 100644 (file)
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -35,6 +35,7 @@
 #define SAMPLE_COUNT           3
 
 #define BYT_RATIOS     0x66a
+#define BYT_VIDS        0x66b
 
 #define FRAC_BITS 8
 #define int_tofp(X) ((int64_t)(X) << FRAC_BITS)
@@ -50,6 +51,8 @@ static inline int32_t div_fp(int32_t x, int32_t y)
        return div_s64((int64_t)x << FRAC_BITS, (int64_t)y);
 }
 
+static u64 energy_divisor;
+
 struct sample {
        int32_t core_pct_busy;
        u64 aperf;
@@ -64,6 +67,12 @@ struct pstate_data {
        int     turbo_pstate;
 };
 
+struct vid_data {
+       int32_t min;
+       int32_t max;
+       int32_t ratio;
+};
+
 struct _pid {
        int setpoint;
        int32_t integral;
@@ -82,10 +91,9 @@ struct cpudata {
        struct timer_list timer;
 
        struct pstate_data pstate;
+       struct vid_data vid;
        struct _pid pid;
 
-       int min_pstate_count;
-
        u64     prev_aperf;
        u64     prev_mperf;
        int     sample_ptr;
@@ -106,7 +114,8 @@ struct pstate_funcs {
        int (*get_max)(void);
        int (*get_min)(void);
        int (*get_turbo)(void);
-       void (*set)(int pstate);
+       void (*set)(struct cpudata*, int pstate);
+       void (*get_vid)(struct cpudata *);
 };
 
 struct cpu_defaults {
@@ -358,6 +367,42 @@ static int byt_get_max_pstate(void)
        return (value >> 16) & 0xFF;
 }
 
+static void byt_set_pstate(struct cpudata *cpudata, int pstate)
+{
+       u64 val;
+       int32_t vid_fp;
+       u32 vid;
+
+       val = pstate << 8;
+       if (limits.no_turbo)
+               val |= (u64)1 << 32;
+
+       vid_fp = cpudata->vid.min + mul_fp(
+               int_tofp(pstate - cpudata->pstate.min_pstate),
+               cpudata->vid.ratio);
+
+       vid_fp = clamp_t(int32_t, vid_fp, cpudata->vid.min, cpudata->vid.max);
+       vid = fp_toint(vid_fp);
+
+       val |= vid;
+
+       wrmsrl(MSR_IA32_PERF_CTL, val);
+}
+
+static void byt_get_vid(struct cpudata *cpudata)
+{
+       u64 value;
+
+       rdmsrl(BYT_VIDS, value);
+       cpudata->vid.min = int_tofp((value >> 8) & 0x7f);
+       cpudata->vid.max = int_tofp((value >> 16) & 0x7f);
+       cpudata->vid.ratio = div_fp(
+               cpudata->vid.max - cpudata->vid.min,
+               int_tofp(cpudata->pstate.max_pstate -
+                       cpudata->pstate.min_pstate));
+}
+
+
 static int core_get_min_pstate(void)
 {
        u64 value;
@@ -384,7 +429,7 @@ static int core_get_turbo_pstate(void)
        return ret;
 }
 
-static void core_set_pstate(int pstate)
+static void core_set_pstate(struct cpudata *cpudata, int pstate)
 {
        u64 val;
 
@@ -425,7 +470,8 @@ static struct cpu_defaults byt_params = {
                .get_max = byt_get_max_pstate,
                .get_min = byt_get_min_pstate,
                .get_turbo = byt_get_max_pstate,
-               .set = core_set_pstate,
+               .set = byt_set_pstate,
+               .get_vid = byt_get_vid,
        },
 };
 
@@ -462,7 +508,7 @@ static void intel_pstate_set_pstate(struct cpudata *cpu, int pstate)
 
        cpu->pstate.current_pstate = pstate;
 
-       pstate_funcs.set(pstate);
+       pstate_funcs.set(cpu, pstate);
 }
 
 static inline void intel_pstate_pstate_increase(struct cpudata *cpu, int steps)
@@ -488,6 +534,9 @@ static void intel_pstate_get_cpu_pstates(struct cpudata *cpu)
        cpu->pstate.max_pstate = pstate_funcs.get_max();
        cpu->pstate.turbo_pstate = pstate_funcs.get_turbo();
 
+       if (pstate_funcs.get_vid)
+               pstate_funcs.get_vid(cpu);
+
        /*
         * goto max pstate so we don't slow up boot if we are built-in if we are
         * a module we will take care of it during normal operation
@@ -512,6 +561,7 @@ static inline void intel_pstate_sample(struct cpudata *cpu)
 
        rdmsrl(MSR_IA32_APERF, aperf);
        rdmsrl(MSR_IA32_MPERF, mperf);
+
        cpu->sample_ptr = (cpu->sample_ptr + 1) % SAMPLE_COUNT;
        cpu->samples[cpu->sample_ptr].aperf = aperf;
        cpu->samples[cpu->sample_ptr].mperf = mperf;
@@ -556,6 +606,7 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
        ctl = pid_calc(pid, busy_scaled);
 
        steps = abs(ctl);
+
        if (ctl < 0)
                intel_pstate_pstate_increase(cpu, steps);
        else
@@ -565,17 +616,23 @@ static inline void intel_pstate_adjust_busy_pstate(struct cpudata *cpu)
 static void intel_pstate_timer_func(unsigned long __data)
 {
        struct cpudata *cpu = (struct cpudata *) __data;
+       struct sample *sample;
+       u64 energy;
 
        intel_pstate_sample(cpu);
+
+       sample = &cpu->samples[cpu->sample_ptr];
+       rdmsrl(MSR_PKG_ENERGY_STATUS, energy);
+
        intel_pstate_adjust_busy_pstate(cpu);
 
-       if (cpu->pstate.current_pstate == cpu->pstate.min_pstate) {
-               cpu->min_pstate_count++;
-               if (!(cpu->min_pstate_count % 5)) {
-                       intel_pstate_set_pstate(cpu, cpu->pstate.max_pstate);
-               }
-       } else
-               cpu->min_pstate_count = 0;
+       trace_pstate_sample(fp_toint(sample->core_pct_busy),
+                       fp_toint(intel_pstate_get_scaled_busy(cpu)),
+                       cpu->pstate.current_pstate,
+                       sample->mperf,
+                       sample->aperf,
+                       div64_u64(energy, energy_divisor),
+                       sample->freq);
 
        intel_pstate_set_sample_time(cpu);
 }
@@ -782,6 +839,7 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
        pstate_funcs.get_min   = funcs->get_min;
        pstate_funcs.get_turbo = funcs->get_turbo;
        pstate_funcs.set       = funcs->set;
+       pstate_funcs.get_vid   = funcs->get_vid;
 }
 
 #if IS_ENABLED(CONFIG_ACPI)
@@ -855,6 +913,7 @@ static int __init intel_pstate_init(void)
        int cpu, rc = 0;
        const struct x86_cpu_id *id;
        struct cpu_defaults *cpu_info;
+       u64 units;
 
        if (no_load)
                return -ENODEV;
@@ -888,8 +947,12 @@ static int __init intel_pstate_init(void)
        if (rc)
                goto out;
 
+       rdmsrl(MSR_RAPL_POWER_UNIT, units);
+       energy_divisor = 1 << ((units >> 8) & 0x1f); /* bits{12:8} */
+
        intel_pstate_debug_expose_params();
        intel_pstate_sysfs_expose_params();
+
        return rc;
 out:
        get_online_cpus();