diff options
Diffstat (limited to 'drivers/gator/gator_trace_power.c')
| -rw-r--r-- | drivers/gator/gator_trace_power.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/drivers/gator/gator_trace_power.c b/drivers/gator/gator_trace_power.c deleted file mode 100644 index ca89b19908f8..000000000000 --- a/drivers/gator/gator_trace_power.c +++ /dev/null @@ -1,160 +0,0 @@ -/** - * Copyright (C) ARM Limited 2011-2012. All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - */ - -#include <linux/cpufreq.h> -#include <trace/events/power.h> - -// cpu_frequency and cpu_idle trace points were introduced in Linux kernel v2.6.38 -// the now deprecated power_frequency trace point was available prior to 2.6.38, but only for x86 -#if GATOR_CPU_FREQ_SUPPORT -enum { - POWER_CPU_FREQ, - POWER_CPU_IDLE, - POWER_TOTAL -}; - -static DEFINE_PER_CPU(ulong, idle_prev_state); -static ulong power_cpu_enabled[POWER_TOTAL]; -static ulong power_cpu_key[POWER_TOTAL]; - -static int gator_trace_power_create_files(struct super_block *sb, struct dentry *root) -{ - struct dentry *dir; - - // cpu_frequency - dir = gatorfs_mkdir(sb, root, "Linux_power_cpu_freq"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &power_cpu_enabled[POWER_CPU_FREQ]); - gatorfs_create_ro_ulong(sb, dir, "key", &power_cpu_key[POWER_CPU_FREQ]); - - // cpu_idle - dir = gatorfs_mkdir(sb, root, "Linux_power_cpu_idle"); - if (!dir) { - return -1; - } - gatorfs_create_ulong(sb, dir, "enabled", &power_cpu_enabled[POWER_CPU_IDLE]); - gatorfs_create_ro_ulong(sb, dir, "key", &power_cpu_key[POWER_CPU_IDLE]); - - return 0; -} - -// 'cpu' may not equal smp_processor_id(), i.e. may not be running on the core that is having the freq/idle state change -GATOR_DEFINE_PROBE(cpu_frequency, TP_PROTO(unsigned int frequency, unsigned int cpu)) -{ - marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], frequency * 1000); -} - -#define WFI_ACTIVE_THRESHOLD 2 // may vary on platform/OS -#define WFI_EXIT 0 -#define WFI_ENTER 1 -GATOR_DEFINE_PROBE(cpu_idle, TP_PROTO(unsigned int state, unsigned int cpu)) -{ - // the streamline engine treats all counter values as unsigned - if (state & 0x80000000) { - state = 0; - } - - if (state == per_cpu(idle_prev_state, cpu)) { - return; - } - - if (state < WFI_ACTIVE_THRESHOLD && per_cpu(idle_prev_state, cpu) >= WFI_ACTIVE_THRESHOLD) { - // transition from wfi to non-wfi - marshal_wfi(cpu, WFI_EXIT); - } else if (state >= WFI_ACTIVE_THRESHOLD && per_cpu(idle_prev_state, cpu) < WFI_ACTIVE_THRESHOLD) { - // transition from non-wfi to wfi - marshal_wfi(cpu, WFI_ENTER); - } - - per_cpu(idle_prev_state, cpu) = state; - - if (power_cpu_enabled[POWER_CPU_IDLE]) { - marshal_event_single(cpu, power_cpu_key[POWER_CPU_IDLE], state); - } -} - -static void gator_trace_power_online(void) -{ - int cpu = smp_processor_id(); - if (power_cpu_enabled[POWER_CPU_FREQ]) { - marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], cpufreq_quick_get(cpu) * 1000); - } -} - -static void gator_trace_power_offline(void) -{ - // Set frequency to zero on an offline - int cpu = smp_processor_id(); - if (power_cpu_enabled[POWER_CPU_FREQ]) { - marshal_event_single(cpu, power_cpu_key[POWER_CPU_FREQ], 0); - } -} - -static int gator_trace_power_start(void) -{ - int cpu; - - // register tracepoints - if (power_cpu_enabled[POWER_CPU_FREQ]) - if (GATOR_REGISTER_TRACE(cpu_frequency)) - goto fail_cpu_frequency_exit; - - // Always register for cpu:idle for detecting WFI, independent of power_cpu_enabled[POWER_CPU_IDLE] - if (GATOR_REGISTER_TRACE(cpu_idle)) - goto fail_cpu_idle_exit; - pr_debug("gator: registered power event tracepoints\n"); - - for_each_present_cpu(cpu) { - per_cpu(idle_prev_state, cpu) = 0; - } - - return 0; - - // unregister tracepoints on error -fail_cpu_idle_exit: - if (power_cpu_enabled[POWER_CPU_FREQ]) - GATOR_UNREGISTER_TRACE(cpu_frequency); -fail_cpu_frequency_exit: - pr_err("gator: power event tracepoints failed to activate, please verify that tracepoints are enabled in the linux kernel\n"); - - return -1; -} - -static void gator_trace_power_stop(void) -{ - int i; - - if (power_cpu_enabled[POWER_CPU_FREQ]) - GATOR_UNREGISTER_TRACE(cpu_frequency); - GATOR_UNREGISTER_TRACE(cpu_idle); - pr_debug("gator: unregistered power event tracepoints\n"); - - for (i = 0; i < POWER_TOTAL; i++) { - power_cpu_enabled[i] = 0; - } -} - -void gator_trace_power_init(void) -{ - int i; - for (i = 0; i < POWER_TOTAL; i++) { - power_cpu_enabled[i] = 0; - power_cpu_key[i] = gator_events_get_key(); - } -} -#else -static int gator_trace_power_create_files(struct super_block *sb, struct dentry *root) {return 0;} -static void gator_trace_power_online(void) {} -static void gator_trace_power_offline(void) {} -static int gator_trace_power_start(void) {return 0;} -static void gator_trace_power_stop(void) {} -void gator_trace_power_init(void) {} -#endif |