diff options
Diffstat (limited to 'drivers/cpufreq')
| -rw-r--r-- | drivers/cpufreq/Kconfig | 5 | ||||
| -rw-r--r-- | drivers/cpufreq/Kconfig.x86 | 2 | ||||
| -rw-r--r-- | drivers/cpufreq/Makefile | 5 | ||||
| -rw-r--r-- | drivers/cpufreq/acpi-cpufreq.c | 7 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq-cpu0.c | 5 | ||||
| -rw-r--r-- | drivers/cpufreq/cpufreq_stats.c | 11 | ||||
| -rw-r--r-- | drivers/cpufreq/longhaul.c | 10 | ||||
| -rw-r--r-- | drivers/cpufreq/omap-cpufreq.c | 3 |
8 files changed, 40 insertions, 8 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index ea512f47b789..e0a899f25e37 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -20,6 +20,9 @@ if CPU_FREQ config CPU_FREQ_TABLE tristate +config CPU_FREQ_GOV_COMMON + bool + config CPU_FREQ_STAT tristate "CPU frequency translation statistics" select CPU_FREQ_TABLE @@ -141,6 +144,7 @@ config CPU_FREQ_GOV_USERSPACE config CPU_FREQ_GOV_ONDEMAND tristate "'ondemand' cpufreq policy governor" select CPU_FREQ_TABLE + select CPU_FREQ_GOV_COMMON help 'ondemand' - This driver adds a dynamic cpufreq policy governor. The governor does a periodic polling and @@ -159,6 +163,7 @@ config CPU_FREQ_GOV_ONDEMAND config CPU_FREQ_GOV_CONSERVATIVE tristate "'conservative' cpufreq governor" depends on CPU_FREQ + select CPU_FREQ_GOV_COMMON help 'conservative' - this driver is rather similar to the 'ondemand' governor both in its source code and its purpose, the difference is diff --git a/drivers/cpufreq/Kconfig.x86 b/drivers/cpufreq/Kconfig.x86 index 934854ae5eb4..7227cd734042 100644 --- a/drivers/cpufreq/Kconfig.x86 +++ b/drivers/cpufreq/Kconfig.x86 @@ -106,7 +106,7 @@ config X86_POWERNOW_K7_ACPI config X86_POWERNOW_K8 tristate "AMD Opteron/Athlon64 PowerNow!" select CPU_FREQ_TABLE - depends on ACPI && ACPI_PROCESSOR + depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ help This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. Support for K10 and newer processors is now in acpi-cpufreq. diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index 1f254ec087c1..fadc4d496e2f 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -7,8 +7,9 @@ obj-$(CONFIG_CPU_FREQ_STAT) += cpufreq_stats.o obj-$(CONFIG_CPU_FREQ_GOV_PERFORMANCE) += cpufreq_performance.o obj-$(CONFIG_CPU_FREQ_GOV_POWERSAVE) += cpufreq_powersave.o obj-$(CONFIG_CPU_FREQ_GOV_USERSPACE) += cpufreq_userspace.o -obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND) += cpufreq_ondemand.o cpufreq_governor.o -obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o cpufreq_governor.o +obj-$(CONFIG_CPU_FREQ_GOV_ONDEMAND) += cpufreq_ondemand.o +obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o +obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o # CPUfreq cross-arch helpers obj-$(CONFIG_CPU_FREQ_TABLE) += freq_table.o diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c index 0d048f6a2b23..7b0d49d78c61 100644 --- a/drivers/cpufreq/acpi-cpufreq.c +++ b/drivers/cpufreq/acpi-cpufreq.c @@ -1030,4 +1030,11 @@ MODULE_PARM_DESC(acpi_pstate_strict, late_initcall(acpi_cpufreq_init); module_exit(acpi_cpufreq_exit); +static const struct x86_cpu_id acpi_cpufreq_ids[] = { + X86_FEATURE_MATCH(X86_FEATURE_ACPI), + X86_FEATURE_MATCH(X86_FEATURE_HW_PSTATE), + {} +}; +MODULE_DEVICE_TABLE(x86cpu, acpi_cpufreq_ids); + MODULE_ALIAS("acpi"); diff --git a/drivers/cpufreq/cpufreq-cpu0.c b/drivers/cpufreq/cpufreq-cpu0.c index 52bf36d599f5..debc5a7c8db6 100644 --- a/drivers/cpufreq/cpufreq-cpu0.c +++ b/drivers/cpufreq/cpufreq-cpu0.c @@ -71,12 +71,15 @@ static int cpu0_set_target(struct cpufreq_policy *policy, } if (cpu_reg) { + rcu_read_lock(); opp = opp_find_freq_ceil(cpu_dev, &freq_Hz); if (IS_ERR(opp)) { + rcu_read_unlock(); pr_err("failed to find OPP for %ld\n", freq_Hz); return PTR_ERR(opp); } volt = opp_get_voltage(opp); + rcu_read_unlock(); tol = volt * voltage_tolerance / 100; volt_old = regulator_get_voltage(cpu_reg); } @@ -236,12 +239,14 @@ static int cpu0_cpufreq_driver_init(void) */ for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) ; + rcu_read_lock(); opp = opp_find_freq_exact(cpu_dev, freq_table[0].frequency * 1000, true); min_uV = opp_get_voltage(opp); opp = opp_find_freq_exact(cpu_dev, freq_table[i-1].frequency * 1000, true); max_uV = opp_get_voltage(opp); + rcu_read_unlock(); ret = regulator_set_voltage_time(cpu_reg, min_uV, max_uV); if (ret > 0) transition_latency += ret * 1000; diff --git a/drivers/cpufreq/cpufreq_stats.c b/drivers/cpufreq/cpufreq_stats.c index e40e50809644..9d7732b81044 100644 --- a/drivers/cpufreq/cpufreq_stats.c +++ b/drivers/cpufreq/cpufreq_stats.c @@ -364,18 +364,21 @@ static int __init cpufreq_stats_init(void) if (ret) return ret; + register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); + for_each_online_cpu(cpu) + cpufreq_update_policy(cpu); + ret = cpufreq_register_notifier(¬ifier_trans_block, CPUFREQ_TRANSITION_NOTIFIER); if (ret) { cpufreq_unregister_notifier(¬ifier_policy_block, CPUFREQ_POLICY_NOTIFIER); + unregister_hotcpu_notifier(&cpufreq_stat_cpu_notifier); + for_each_online_cpu(cpu) + cpufreq_stats_free_table(cpu); return ret; } - register_hotcpu_notifier(&cpufreq_stat_cpu_notifier); - for_each_online_cpu(cpu) { - cpufreq_update_policy(cpu); - } return 0; } static void __exit cpufreq_stats_exit(void) diff --git a/drivers/cpufreq/longhaul.c b/drivers/cpufreq/longhaul.c index f1fa500ac105..1180d536d1eb 100644 --- a/drivers/cpufreq/longhaul.c +++ b/drivers/cpufreq/longhaul.c @@ -77,7 +77,7 @@ static unsigned int longhaul_index; static int scale_voltage; static int disable_acpi_c3; static int revid_errata; - +static int enable; /* Clock ratios multiplied by 10 */ static int mults[32]; @@ -965,6 +965,10 @@ static int __init longhaul_init(void) if (!x86_match_cpu(longhaul_id)) return -ENODEV; + if (!enable) { + printk(KERN_ERR PFX "Option \"enable\" not set. Aborting.\n"); + return -ENODEV; + } #ifdef CONFIG_SMP if (num_online_cpus() > 1) { printk(KERN_ERR PFX "More than 1 CPU detected, " @@ -1021,6 +1025,10 @@ MODULE_PARM_DESC(scale_voltage, "Scale voltage of processor"); * such. */ module_param(revid_errata, int, 0644); MODULE_PARM_DESC(revid_errata, "Ignore CPU Revision ID"); +/* By default driver is disabled to prevent incompatible + * system freeze. */ +module_param(enable, int, 0644); +MODULE_PARM_DESC(enable, "Enable driver"); MODULE_AUTHOR("Dave Jones <davej@redhat.com>"); MODULE_DESCRIPTION("Longhaul driver for VIA Cyrix processors."); diff --git a/drivers/cpufreq/omap-cpufreq.c b/drivers/cpufreq/omap-cpufreq.c index 1f3417a8322d..97102b05843f 100644 --- a/drivers/cpufreq/omap-cpufreq.c +++ b/drivers/cpufreq/omap-cpufreq.c @@ -110,13 +110,16 @@ static int omap_target(struct cpufreq_policy *policy, freq = ret; if (mpu_reg) { + rcu_read_lock(); opp = opp_find_freq_ceil(mpu_dev, &freq); if (IS_ERR(opp)) { + rcu_read_unlock(); dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n", __func__, freqs.new); return -EINVAL; } volt = opp_get_voltage(opp); + rcu_read_unlock(); tol = volt * OPP_TOLERANCE / 100; volt_old = regulator_get_voltage(mpu_reg); } |