diff options
Diffstat (limited to 'tools/power/cpupower/utils/idle_monitor/snb_idle.c')
| -rw-r--r-- | tools/power/cpupower/utils/idle_monitor/snb_idle.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/idle_monitor/snb_idle.c b/tools/power/cpupower/utils/idle_monitor/snb_idle.c new file mode 100644 index 000000000000..a1bc07cd53e1 --- /dev/null +++ b/tools/power/cpupower/utils/idle_monitor/snb_idle.c @@ -0,0 +1,190 @@ +/* + * (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc. + * + * Licensed under the terms of the GNU GPL License version 2. + * + * Based on Len Brown's <lenb@kernel.org> turbostat tool. + */ + +#if defined(__i386__) || defined(__x86_64__) + +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> + +#include "helpers/helpers.h" +#include "idle_monitor/cpupower-monitor.h" + +#define MSR_PKG_C2_RESIDENCY 0x60D +#define MSR_PKG_C7_RESIDENCY 0x3FA +#define MSR_CORE_C7_RESIDENCY 0x3FE + +#define MSR_TSC 0x10 + +enum intel_snb_id { C7 = 0, PC2, PC7, SNB_CSTATE_COUNT, TSC = 0xFFFF }; + +static int snb_get_count_percent(unsigned int self_id, double *percent, + unsigned int cpu); + +static cstate_t snb_cstates[SNB_CSTATE_COUNT] = { + { + .name = "C7", + .desc = N_("Processor Core C7"), + .id = C7, + .range = RANGE_CORE, + .get_count_percent = snb_get_count_percent, + }, + { + .name = "PC2", + .desc = N_("Processor Package C2"), + .id = PC2, + .range = RANGE_PACKAGE, + .get_count_percent = snb_get_count_percent, + }, + { + .name = "PC7", + .desc = N_("Processor Package C7"), + .id = PC7, + .range = RANGE_PACKAGE, + .get_count_percent = snb_get_count_percent, + }, +}; + +static unsigned long long tsc_at_measure_start; +static unsigned long long tsc_at_measure_end; +static unsigned long long *previous_count[SNB_CSTATE_COUNT]; +static unsigned long long *current_count[SNB_CSTATE_COUNT]; +/* valid flag for all CPUs. If a MSR read failed it will be zero */ +static int *is_valid; + +static int snb_get_count(enum intel_snb_id id, unsigned long long *val, + unsigned int cpu) +{ + int msr; + + switch (id) { + case C7: + msr = MSR_CORE_C7_RESIDENCY; + break; + case PC2: + msr = MSR_PKG_C2_RESIDENCY; + break; + case PC7: + msr = MSR_PKG_C7_RESIDENCY; + break; + case TSC: + msr = MSR_TSC; + break; + default: + return -1; + }; + if (read_msr(cpu, msr, val)) + return -1; + return 0; +} + +static int snb_get_count_percent(unsigned int id, double *percent, + unsigned int cpu) +{ + *percent = 0.0; + + if (!is_valid[cpu]) + return -1; + + *percent = (100.0 * + (current_count[id][cpu] - previous_count[id][cpu])) / + (tsc_at_measure_end - tsc_at_measure_start); + + dprint("%s: previous: %llu - current: %llu - (%u)\n", + snb_cstates[id].name, previous_count[id][cpu], + current_count[id][cpu], cpu); + + dprint("%s: tsc_diff: %llu - count_diff: %llu - percent: %2.f (%u)\n", + snb_cstates[id].name, + (unsigned long long) tsc_at_measure_end - tsc_at_measure_start, + current_count[id][cpu] - previous_count[id][cpu], + *percent, cpu); + + return 0; +} + +static int snb_start(void) +{ + int num, cpu; + unsigned long long val; + + for (num = 0; num < SNB_CSTATE_COUNT; num++) { + for (cpu = 0; cpu < cpu_count; cpu++) { + snb_get_count(num, &val, cpu); + previous_count[num][cpu] = val; + } + } + snb_get_count(TSC, &tsc_at_measure_start, 0); + return 0; +} + +static int snb_stop(void) +{ + unsigned long long val; + int num, cpu; + + snb_get_count(TSC, &tsc_at_measure_end, 0); + + for (num = 0; num < SNB_CSTATE_COUNT; num++) { + for (cpu = 0; cpu < cpu_count; cpu++) { + is_valid[cpu] = !snb_get_count(num, &val, cpu); + current_count[num][cpu] = val; + } + } + return 0; +} + +struct cpuidle_monitor intel_snb_monitor; + +static struct cpuidle_monitor *snb_register(void) +{ + int num; + + if (cpupower_cpu_info.vendor != X86_VENDOR_INTEL + || cpupower_cpu_info.family != 6) + return NULL; + + if (cpupower_cpu_info.model != 0x2A + && cpupower_cpu_info.model != 0x2D) + return NULL; + + is_valid = calloc(cpu_count, sizeof(int)); + for (num = 0; num < SNB_CSTATE_COUNT; num++) { + previous_count[num] = calloc(cpu_count, + sizeof(unsigned long long)); + current_count[num] = calloc(cpu_count, + sizeof(unsigned long long)); + } + intel_snb_monitor.name_len = strlen(intel_snb_monitor.name); + return &intel_snb_monitor; +} + +void snb_unregister(void) +{ + int num; + free(is_valid); + for (num = 0; num < SNB_CSTATE_COUNT; num++) { + free(previous_count[num]); + free(current_count[num]); + } +} + +struct cpuidle_monitor intel_snb_monitor = { + .name = "SandyBridge", + .hw_states = snb_cstates, + .hw_states_num = SNB_CSTATE_COUNT, + .start = snb_start, + .stop = snb_stop, + .do_register = snb_register, + .unregister = snb_unregister, + .needs_root = 1, + .overflow_s = 922000000 /* 922337203 seconds TSC overflow + at 20GHz */ +}; +#endif /* defined(__i386__) || defined(__x86_64__) */ |