tools/power turbostat: enable turbostat to support Knights Landing (KNL)

Changes mainly to account for minor differences in Knights Landing(KNL):
1. KNL supports C1 and C6 core states.
2. KNL supports PC2, PC3 and PC6 package states.
3. KNL has a different encoding of the TURBO_RATIO_LIMIT MSR

Signed-off-by: Dasaratharaman Chandramouli <dasaratharaman.chandramouli@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index c469490..3c6bb34 100644 (file)
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -140,6 +140,7 @@
 #define MSR_CORE_C3_RESIDENCY          0x000003fc
 #define MSR_CORE_C6_RESIDENCY          0x000003fd
 #define MSR_CORE_C7_RESIDENCY          0x000003fe
+#define MSR_KNL_CORE_C6_RESIDENCY      0x000003ff
 #define MSR_PKG_C2_RESIDENCY           0x0000060d
 #define MSR_PKG_C8_RESIDENCY           0x00000630
 #define MSR_PKG_C9_RESIDENCY           0x00000631

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index d85adba..256a5e1 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -52,6 +52,7 @@ unsigned int skip_c0;
 unsigned int skip_c1;
 unsigned int do_nhm_cstates;
 unsigned int do_snb_cstates;
+unsigned int do_knl_cstates;
 unsigned int do_pc2;
 unsigned int do_pc3;
 unsigned int do_pc6;
@@ -316,7 +317,7 @@ void print_header(void)
 
        if (do_nhm_cstates)
                outp += sprintf(outp, "  CPU%%c1");
-       if (do_nhm_cstates && !do_slm_cstates)
+       if (do_nhm_cstates && !do_slm_cstates && !do_knl_cstates)
                outp += sprintf(outp, "  CPU%%c3");
        if (do_nhm_cstates)
                outp += sprintf(outp, "  CPU%%c6");
@@ -546,7 +547,7 @@ int format_counters(struct thread_data *t, struct core_data *c,
        if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE))
                goto done;
 
-       if (do_nhm_cstates && !do_slm_cstates)
+       if (do_nhm_cstates && !do_slm_cstates && !do_knl_cstates)
                outp += sprintf(outp, "%8.2f", 100.0 * c->c3/t->tsc);
        if (do_nhm_cstates)
                outp += sprintf(outp, "%8.2f", 100.0 * c->c6/t->tsc);
@@ -1018,14 +1019,17 @@ int get_counters(struct thread_data *t, struct core_data *c, struct pkg_data *p)
        if (!(t->flags & CPU_IS_FIRST_THREAD_IN_CORE))
                return 0;
 
-       if (do_nhm_cstates && !do_slm_cstates) {
+       if (do_nhm_cstates && !do_slm_cstates && !do_knl_cstates) {
                if (get_msr(cpu, MSR_CORE_C3_RESIDENCY, &c->c3))
                        return -6;
        }
 
-       if (do_nhm_cstates) {
+       if (do_nhm_cstates && !do_knl_cstates) {
                if (get_msr(cpu, MSR_CORE_C6_RESIDENCY, &c->c6))
                        return -7;
+       } else if (do_knl_cstates) {
+               if (get_msr(cpu, MSR_KNL_CORE_C6_RESIDENCY, &c->c6))
+                       return -7;
        }
 
        if (do_snb_cstates)
@@ -1295,6 +1299,67 @@ dump_nhm_turbo_ratio_limits(void)
        return;
 }
 
+static void
+dump_knl_turbo_ratio_limits(void)
+{
+       int cores;
+       unsigned int ratio;
+       unsigned long long msr;
+       int delta_cores;
+       int delta_ratio;
+       int i;
+
+       get_msr(0, MSR_NHM_TURBO_RATIO_LIMIT, &msr);
+
+       fprintf(stderr, "cpu0: MSR_NHM_TURBO_RATIO_LIMIT: 0x%08llx\n",
+       msr);
+
+       /**
+        * Turbo encoding in KNL is as follows:
+        * [7:0] -- Base value of number of active cores of bucket 1.
+        * [15:8] -- Base value of freq ratio of bucket 1.
+        * [20:16] -- +ve delta of number of active cores of bucket 2.
+        * i.e. active cores of bucket 2 =
+        * active cores of bucket 1 + delta
+        * [23:21] -- Negative delta of freq ratio of bucket 2.
+        * i.e. freq ratio of bucket 2 =
+        * freq ratio of bucket 1 - delta
+        * [28:24]-- +ve delta of number of active cores of bucket 3.
+        * [31:29]-- -ve delta of freq ratio of bucket 3.
+        * [36:32]-- +ve delta of number of active cores of bucket 4.
+        * [39:37]-- -ve delta of freq ratio of bucket 4.
+        * [44:40]-- +ve delta of number of active cores of bucket 5.
+        * [47:45]-- -ve delta of freq ratio of bucket 5.
+        * [52:48]-- +ve delta of number of active cores of bucket 6.
+        * [55:53]-- -ve delta of freq ratio of bucket 6.
+        * [60:56]-- +ve delta of number of active cores of bucket 7.
+        * [63:61]-- -ve delta of freq ratio of bucket 7.
+        */
+       cores = msr & 0xFF;
+       ratio = (msr >> 8) && 0xFF;
+       if (ratio > 0)
+               fprintf(stderr,
+                       "%d * %.0f = %.0f MHz max turbo %d active cores\n",
+                       ratio, bclk, ratio * bclk, cores);
+
+       for (i = 16; i < 64; i = i + 8) {
+               delta_cores = (msr >> i) & 0x1F;
+               delta_ratio = (msr >> (i + 5)) && 0x7;
+               if (!delta_cores || !delta_ratio)
+                       return;
+               cores = cores + delta_cores;
+               ratio = ratio - delta_ratio;
+
+               /** -ve ratios will make successive ratio calculations
+                * negative. Hence return instead of carrying on.
+                */
+               if (ratio > 0)
+                       fprintf(stderr,
+                               "%d * %.0f = %.0f MHz max turbo %d active cores\n",
+                               ratio, bclk, ratio * bclk, cores);
+       }
+}
+
 static void
 dump_nhm_cst_cfg(void)
 {
@@ -1788,6 +1853,21 @@ int has_hsw_turbo_ratio_limit(unsigned int family, unsigned int model)
        }
 }
 
+int has_knl_turbo_ratio_limit(unsigned int family, unsigned int model)
+{
+       if (!genuine_intel)
+               return 0;
+
+       if (family != 6)
+               return 0;
+
+       switch (model) {
+       case 0x57:      /* Knights Landing */
+               return 1;
+       default:
+               return 0;
+       }
+}
 static void
 dump_cstate_pstate_config_info(family, model)
 {
@@ -1805,6 +1885,9 @@ dump_cstate_pstate_config_info(family, model)
        if (has_nhm_turbo_ratio_limit(family, model))
                dump_nhm_turbo_ratio_limits();
 
+       if (has_knl_turbo_ratio_limit(family, model))
+               dump_knl_turbo_ratio_limits();
+
        dump_nhm_cst_cfg();
 }
 
@@ -1985,6 +2068,7 @@ rapl_dram_energy_units_probe(int  model, double rapl_energy_units)
        case 0x3F:      /* HSX */
        case 0x4F:      /* BDX */
        case 0x56:      /* BDX-DE */
+       case 0x57:      /* KNL */
                return (rapl_dram_energy_units = 15.3 / 1000000);
        default:
                return (rapl_energy_units);
@@ -2026,6 +2110,7 @@ void rapl_probe(unsigned int family, unsigned int model)
        case 0x3F:      /* HSX */
        case 0x4F:      /* BDX */
        case 0x56:      /* BDX-DE */
+       case 0x57:      /* KNL */
                do_rapl = RAPL_PKG | RAPL_DRAM | RAPL_DRAM_POWER_INFO | RAPL_DRAM_PERF_STATUS | RAPL_PKG_PERF_STATUS | RAPL_PKG_POWER_INFO;
                break;
        case 0x2D:
@@ -2366,6 +2451,17 @@ int is_slm(unsigned int family, unsigned int model)
        return 0;
 }
 
+int is_knl(unsigned int family, unsigned int model)
+{
+       if (!genuine_intel)
+               return 0;
+       switch (model) {
+       case 0x57:      /* KNL */
+               return 1;
+       }
+       return 0;
+}
+
 #define SLM_BCLK_FREQS 5
 double slm_freq_table[SLM_BCLK_FREQS] = { 83.3, 100.0, 133.3, 116.7, 80.0};
 
@@ -2576,6 +2672,7 @@ void process_cpuid()
        do_c8_c9_c10 = has_hsw_msrs(family, model);
        do_skl_residency = has_skl_msrs(family, model);
        do_slm_cstates = is_slm(family, model);
+       do_knl_cstates  = is_knl(family, model);
        bclk = discover_bclk(family, model);
 
        rapl_probe(family, model);