diff options
Diffstat (limited to 'target/linux/xburst/patches-3.8/0010-cpufreq_stats-Support-runtime-changes-to-frequency-t.patch')
| -rw-r--r-- | target/linux/xburst/patches-3.8/0010-cpufreq_stats-Support-runtime-changes-to-frequency-t.patch | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-3.8/0010-cpufreq_stats-Support-runtime-changes-to-frequency-t.patch b/target/linux/xburst/patches-3.8/0010-cpufreq_stats-Support-runtime-changes-to-frequency-t.patch new file mode 100644 index 000000000..f526eaba3 --- /dev/null +++ b/target/linux/xburst/patches-3.8/0010-cpufreq_stats-Support-runtime-changes-to-frequency-t.patch @@ -0,0 +1,304 @@ +From ca40c7542f0cd0e0dfa074bd4ccefc04b8561427 Mon Sep 17 00:00:00 2001 +From: Maarten ter Huurne <maarten@treewalker.org> +Date: Tue, 2 Aug 2011 10:26:09 +0200 +Subject: [PATCH 10/21] cpufreq_stats: Support runtime changes to frequency + table. + +--- + drivers/cpufreq/cpufreq_stats.c | 161 ++++++++++++++++++++------------------- + 1 files changed, 83 insertions(+), 78 deletions(-) + +--- a/drivers/cpufreq/cpufreq_stats.c ++++ b/drivers/cpufreq/cpufreq_stats.c +@@ -20,6 +20,7 @@ + #include <linux/kobject.h> + #include <linux/spinlock.h> + #include <linux/notifier.h> ++#include <linux/string.h> + #include <asm/cputime.h> + + static spinlock_t cpufreq_stats_lock; +@@ -36,7 +37,7 @@ struct cpufreq_stats { + unsigned long long last_time; + unsigned int max_state; + unsigned int state_num; +- unsigned int last_index; ++ int last_index; + u64 *time_in_state; + unsigned int *freq_table; + #ifdef CONFIG_CPU_FREQ_STAT_DETAILS +@@ -59,7 +60,7 @@ static int cpufreq_stats_update(unsigned + cur_time = get_jiffies_64(); + spin_lock(&cpufreq_stats_lock); + stat = per_cpu(cpufreq_stats_table, cpu); +- if (stat->time_in_state) ++ if (stat->time_in_state && stat->last_index != -1) + stat->time_in_state[stat->last_index] += + cur_time - stat->last_time; + stat->last_time = cur_time; +@@ -81,7 +82,7 @@ static ssize_t show_time_in_state(struct + ssize_t len = 0; + int i; + struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); +- if (!stat) ++ if (!stat || !stat->time_in_state) + return 0; + cpufreq_stats_update(stat->cpu); + for (i = 0; i < stat->state_num; i++) { +@@ -99,7 +100,7 @@ static ssize_t show_trans_table(struct c + int i, j; + + struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, policy->cpu); +- if (!stat) ++ if (!stat || !stat->trans_table) + return 0; + cpufreq_stats_update(stat->cpu); + len += snprintf(buf + len, PAGE_SIZE - len, " From : To\n"); +@@ -158,63 +159,35 @@ static struct attribute_group stats_attr + static int freq_table_get_index(struct cpufreq_stats *stat, unsigned int freq) + { + int index; +- for (index = 0; index < stat->max_state; index++) +- if (stat->freq_table[index] == freq) +- return index; ++ if (stat->freq_table) ++ for (index = 0; index < stat->max_state; index++) ++ if (stat->freq_table[index] == freq) ++ return index; + return -1; + } + +-/* should be called late in the CPU removal sequence so that the stats +- * memory is still available in case someone tries to use it. +- */ + static void cpufreq_stats_free_table(unsigned int cpu) + { + struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu); ++ struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); ++ if (policy && policy->cpu == cpu) ++ sysfs_remove_group(&policy->kobj, &stats_attr_group); + if (stat) { + kfree(stat->time_in_state); + kfree(stat); + } + per_cpu(cpufreq_stats_table, cpu) = NULL; +-} +- +-/* must be called early in the CPU removal sequence (before +- * cpufreq_remove_dev) so that policy is still valid. +- */ +-static void cpufreq_stats_free_sysfs(unsigned int cpu) +-{ +- struct cpufreq_policy *policy = cpufreq_cpu_get(cpu); +- if (policy && policy->cpu == cpu) +- sysfs_remove_group(&policy->kobj, &stats_attr_group); + if (policy) + cpufreq_cpu_put(policy); + } + +-static int cpufreq_stats_create_table(struct cpufreq_policy *policy, ++static int cpufreq_stats_update_table(struct cpufreq_policy *policy, + struct cpufreq_frequency_table *table) + { +- unsigned int i, j, count = 0, ret = 0; +- struct cpufreq_stats *stat; +- struct cpufreq_policy *data; ++ unsigned int i, j, count = 0; + unsigned int alloc_size; + unsigned int cpu = policy->cpu; +- if (per_cpu(cpufreq_stats_table, cpu)) +- return -EBUSY; +- stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL); +- if ((stat) == NULL) +- return -ENOMEM; +- +- data = cpufreq_cpu_get(cpu); +- if (data == NULL) { +- ret = -EINVAL; +- goto error_get_fail; +- } +- +- ret = sysfs_create_group(&data->kobj, &stats_attr_group); +- if (ret) +- goto error_out; +- +- stat->cpu = cpu; +- per_cpu(cpufreq_stats_table, cpu) = stat; ++ struct cpufreq_stats *stat = per_cpu(cpufreq_stats_table, cpu); + + for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { + unsigned int freq = table[i].frequency; +@@ -223,40 +196,76 @@ static int cpufreq_stats_create_table(st + count++; + } + ++ if (stat->max_state != count) { ++ stat->max_state = count; ++ kfree(stat->time_in_state); ++ stat->time_in_state = NULL; ++ } ++ + alloc_size = count * sizeof(int) + count * sizeof(u64); + + #ifdef CONFIG_CPU_FREQ_STAT_DETAILS + alloc_size += count * count * sizeof(int); + #endif +- stat->max_state = count; +- stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL); +- if (!stat->time_in_state) { +- ret = -ENOMEM; +- goto error_out; +- } +- stat->freq_table = (unsigned int *)(stat->time_in_state + count); +- ++ if (stat->time_in_state) { ++ memset(stat->time_in_state, 0, alloc_size); ++ } else { ++ stat->time_in_state = kzalloc(alloc_size, GFP_KERNEL); ++ if (!stat->time_in_state) ++ return -ENOMEM; ++ stat->freq_table = (unsigned int *)( ++ stat->time_in_state + count); + #ifdef CONFIG_CPU_FREQ_STAT_DETAILS +- stat->trans_table = stat->freq_table + count; ++ stat->trans_table = stat->freq_table + count; + #endif ++ } ++ + j = 0; +- for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { +- unsigned int freq = table[i].frequency; +- if (freq == CPUFREQ_ENTRY_INVALID) +- continue; +- if (freq_table_get_index(stat, freq) == -1) +- stat->freq_table[j++] = freq; ++ if (stat->freq_table) { ++ for (i = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { ++ unsigned int freq = table[i].frequency; ++ if (freq == CPUFREQ_ENTRY_INVALID) ++ continue; ++ if (freq_table_get_index(stat, freq) == -1) ++ stat->freq_table[j++] = freq; ++ } + } ++ + stat->state_num = j; + spin_lock(&cpufreq_stats_lock); + stat->last_time = get_jiffies_64(); + stat->last_index = freq_table_get_index(stat, policy->cur); + spin_unlock(&cpufreq_stats_lock); ++ return 0; ++} ++ ++static int cpufreq_stats_create_table(struct cpufreq_policy *policy, ++ struct cpufreq_frequency_table *table) ++{ ++ unsigned int ret = 0; ++ struct cpufreq_stats *stat; ++ struct cpufreq_policy *data; ++ unsigned int cpu = policy->cpu; ++ ++ stat = kzalloc(sizeof(struct cpufreq_stats), GFP_KERNEL); ++ if ((stat) == NULL) ++ return -ENOMEM; ++ ++ data = cpufreq_cpu_get(cpu); ++ if (data == NULL) { ++ ret = -EINVAL; ++ goto error_out; ++ } ++ ret = sysfs_create_group(&data->kobj, &stats_attr_group); + cpufreq_cpu_put(data); ++ if (ret) ++ goto error_out; ++ ++ stat->cpu = cpu; ++ per_cpu(cpufreq_stats_table, cpu) = stat; ++ + return 0; + error_out: +- cpufreq_cpu_put(data); +-error_get_fail: + kfree(stat); + per_cpu(cpufreq_stats_table, cpu) = NULL; + return ret; +@@ -274,10 +283,12 @@ static int cpufreq_stat_notifier_policy( + table = cpufreq_frequency_get_table(cpu); + if (!table) + return 0; +- ret = cpufreq_stats_create_table(policy, table); +- if (ret) +- return ret; +- return 0; ++ if (!per_cpu(cpufreq_stats_table, cpu)) { ++ ret = cpufreq_stats_create_table(policy, table); ++ if (ret) ++ return ret; ++ } ++ return cpufreq_stats_update_table(policy, table); + } + + static int cpufreq_stat_notifier_trans(struct notifier_block *nb, +@@ -297,21 +308,23 @@ static int cpufreq_stat_notifier_trans(s + old_index = stat->last_index; + new_index = freq_table_get_index(stat, freq->new); + +- /* We can't do stat->time_in_state[-1]= .. */ +- if (old_index == -1 || new_index == -1) +- return 0; +- + cpufreq_stats_update(freq->cpu); +- + if (old_index == new_index) + return 0; + ++ if (new_index == -1) ++ return 0; ++ + spin_lock(&cpufreq_stats_lock); + stat->last_index = new_index; ++ if (old_index != -1) { + #ifdef CONFIG_CPU_FREQ_STAT_DETAILS +- stat->trans_table[old_index * stat->max_state + new_index]++; ++ if (stat->trans_table) ++ stat->trans_table[old_index * stat->max_state + ++ new_index]++; + #endif +- stat->total_trans++; ++ stat->total_trans++; ++ } + spin_unlock(&cpufreq_stats_lock); + return 0; + } +@@ -327,10 +340,6 @@ static int __cpuinit cpufreq_stat_cpu_ca + case CPU_ONLINE_FROZEN: + cpufreq_update_policy(cpu); + break; +- case CPU_DOWN_PREPARE: +- case CPU_DOWN_PREPARE_FROZEN: +- cpufreq_stats_free_sysfs(cpu); +- break; + case CPU_DEAD: + case CPU_DEAD_FROZEN: + cpufreq_stats_free_table(cpu); +@@ -339,10 +348,9 @@ static int __cpuinit cpufreq_stat_cpu_ca + return NOTIFY_OK; + } + +-/* priority=1 so this will get called before cpufreq_remove_dev */ +-static struct notifier_block cpufreq_stat_cpu_notifier __refdata = { ++static struct notifier_block cpufreq_stat_cpu_notifier __refdata = ++{ + .notifier_call = cpufreq_stat_cpu_callback, +- .priority = 1, + }; + + static struct notifier_block notifier_policy_block = { +@@ -392,7 +400,6 @@ static void __exit cpufreq_stats_exit(vo + unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); + for_each_online_cpu(cpu) { + cpufreq_stats_free_table(cpu); +- cpufreq_stats_free_sysfs(cpu); + } + } + |