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Merge branch 'pm-cpufreq-qos'

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* pm-cpufreq-qos:
  Documentation: cpufreq: Update policy notifier documentation
  cpufreq: Remove CPUFREQ_ADJUST and CPUFREQ_NOTIFY policy notifier events
  ACPI: cpufreq: Switch to QoS requests instead of cpufreq notifier
  video: pxafb: Remove cpufreq policy notifier
  video: sa1100fb: Remove cpufreq policy notifier
  arch_topology: Use CPUFREQ_CREATE_POLICY instead of CPUFREQ_NOTIFY
  cpufreq: powerpc_cbe: Switch to QoS requests for freq limits
  cpufreq: powerpc: macintosh: Switch to QoS requests for freq limits
  thermal: cpu_cooling: Switch to QoS requests for freq limits
  cpufreq: Add policy create/remove notifiers back
This commit is contained in:
Rafael J. Wysocki 2019-09-05 09:01:26 +02:00
commit beb4e08e21
17 changed files with 323 additions and 361 deletions
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16
Documentation/cpu-freq/core.txt
View File

@ -57,19 +57,11 @@ transition notifiers.
2.1 CPUFreq policy notifiers
----------------------------
These are notified when a new policy is intended to be set. Each
CPUFreq policy notifier is called twice for a policy transition:
These are notified when a new policy is created or removed.
1.) During CPUFREQ_ADJUST all CPUFreq notifiers may change the limit if
they see a need for this - may it be thermal considerations or
hardware limitations.
2.) And during CPUFREQ_NOTIFY all notifiers are informed of the new policy
- if two hardware drivers failed to agree on a new policy before this
stage, the incompatible hardware shall be shut down, and the user
informed of this.
The phase is specified in the second argument to the notifier.
The phase is specified in the second argument to the notifier. The phase is
CPUFREQ_CREATE_POLICY when the policy is first created and it is
CPUFREQ_REMOVE_POLICY when the policy is removed.
The third argument, a void *pointer, points to a struct cpufreq_policy
consisting of several values, including min, max (the lower and upper

39
drivers/acpi/processor_driver.c
View File

@ -284,6 +284,29 @@ static int acpi_processor_stop(struct device *dev)
return 0;
}
bool acpi_processor_cpufreq_init;
static int acpi_processor_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
int cpu = policy->cpu;
if (event == CPUFREQ_CREATE_POLICY) {
acpi_thermal_cpufreq_init(cpu);
acpi_processor_ppc_init(cpu);
} else if (event == CPUFREQ_REMOVE_POLICY) {
acpi_processor_ppc_exit(cpu);
acpi_thermal_cpufreq_exit(cpu);
}
return 0;
}
static struct notifier_block acpi_processor_notifier_block = {
.notifier_call = acpi_processor_notifier,
};
/*
* We keep the driver loaded even when ACPI is not running.
* This is needed for the powernow-k8 driver, that works even without
@ -310,8 +333,12 @@ static int __init acpi_processor_driver_init(void)
cpuhp_setup_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD, "acpi/cpu-drv:dead",
NULL, acpi_soft_cpu_dead);
acpi_thermal_cpufreq_init();
acpi_processor_ppc_init();
if (!cpufreq_register_notifier(&acpi_processor_notifier_block,
CPUFREQ_POLICY_NOTIFIER)) {
acpi_processor_cpufreq_init = true;
acpi_processor_ignore_ppc_init();
}
acpi_processor_throttling_init();
return 0;
err:
@ -324,8 +351,12 @@ static void __exit acpi_processor_driver_exit(void)
if (acpi_disabled)
return;
acpi_processor_ppc_exit();
acpi_thermal_cpufreq_exit();
if (acpi_processor_cpufreq_init) {
cpufreq_unregister_notifier(&acpi_processor_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
acpi_processor_cpufreq_init = false;
}
cpuhp_remove_state_nocalls(hp_online);
cpuhp_remove_state_nocalls(CPUHP_ACPI_CPUDRV_DEAD);
driver_unregister(&acpi_processor_driver);

100
drivers/acpi/processor_perflib.c
View File

@ -50,57 +50,13 @@ module_param(ignore_ppc, int, 0644);
MODULE_PARM_DESC(ignore_ppc, "If the frequency of your machine gets wrongly" \
"limited by BIOS, this should help");
#define PPC_REGISTERED 1
#define PPC_IN_USE 2
static int acpi_processor_ppc_status;
static int acpi_processor_ppc_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
struct acpi_processor *pr;
unsigned int ppc = 0;
if (ignore_ppc < 0)
ignore_ppc = 0;
if (ignore_ppc)
return 0;
if (event != CPUFREQ_ADJUST)
return 0;
mutex_lock(&performance_mutex);
pr = per_cpu(processors, policy->cpu);
if (!pr || !pr->performance)
goto out;
ppc = (unsigned int)pr->performance_platform_limit;
if (ppc >= pr->performance->state_count)
goto out;
cpufreq_verify_within_limits(policy, 0,
pr->performance->states[ppc].
core_frequency * 1000);
out:
mutex_unlock(&performance_mutex);
return 0;
}
static struct notifier_block acpi_ppc_notifier_block = {
.notifier_call = acpi_processor_ppc_notifier,
};
static bool acpi_processor_ppc_in_use;
static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
acpi_status status = 0;
unsigned long long ppc = 0;
int ret;
if (!pr)
return -EINVAL;
@ -112,7 +68,7 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
status = acpi_evaluate_integer(pr->handle, "_PPC", NULL, &ppc);
if (status != AE_NOT_FOUND)
acpi_processor_ppc_status |= PPC_IN_USE;
acpi_processor_ppc_in_use = true;
if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PPC"));
@ -124,6 +80,17 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
pr->performance_platform_limit = (int)ppc;
if (ppc >= pr->performance->state_count ||
unlikely(!dev_pm_qos_request_active(&pr->perflib_req)))
return 0;
ret = dev_pm_qos_update_request(&pr->perflib_req,
pr->performance->states[ppc].core_frequency * 1000);
if (ret < 0) {
pr_warn("Failed to update perflib freq constraint: CPU%d (%d)\n",
pr->id, ret);
}
return 0;
}
@ -184,23 +151,32 @@ int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
}
EXPORT_SYMBOL(acpi_processor_get_bios_limit);
void acpi_processor_ppc_init(void)
void acpi_processor_ignore_ppc_init(void)
{
if (!cpufreq_register_notifier
(&acpi_ppc_notifier_block, CPUFREQ_POLICY_NOTIFIER))
acpi_processor_ppc_status |= PPC_REGISTERED;
else
printk(KERN_DEBUG
"Warning: Processor Platform Limit not supported.\n");
if (ignore_ppc < 0)
ignore_ppc = 0;
}
void acpi_processor_ppc_exit(void)
void acpi_processor_ppc_init(int cpu)
{
if (acpi_processor_ppc_status & PPC_REGISTERED)
cpufreq_unregister_notifier(&acpi_ppc_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
struct acpi_processor *pr = per_cpu(processors, cpu);
int ret;
acpi_processor_ppc_status &= ~PPC_REGISTERED;
ret = dev_pm_qos_add_request(get_cpu_device(cpu),
&pr->perflib_req, DEV_PM_QOS_MAX_FREQUENCY,
INT_MAX);
if (ret < 0) {
pr_err("Failed to add freq constraint for CPU%d (%d)\n", cpu,
ret);
return;
}
}
void acpi_processor_ppc_exit(int cpu)
{
struct acpi_processor *pr = per_cpu(processors, cpu);
dev_pm_qos_remove_request(&pr->perflib_req);
}
static int acpi_processor_get_performance_control(struct acpi_processor *pr)
@ -477,7 +453,7 @@ int acpi_processor_notify_smm(struct module *calling_module)
static int is_done = 0;
int result;
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
if (!acpi_processor_cpufreq_init)
return -EBUSY;
if (!try_module_get(calling_module))
@ -513,7 +489,7 @@ int acpi_processor_notify_smm(struct module *calling_module)
* we can allow the cpufreq driver to be rmmod'ed. */
is_done = 1;
if (!(acpi_processor_ppc_status & PPC_IN_USE))
if (!acpi_processor_ppc_in_use)
module_put(calling_module);
return 0;
@ -742,7 +718,7 @@ acpi_processor_register_performance(struct acpi_processor_performance
{
struct acpi_processor *pr;
if (!(acpi_processor_ppc_status & PPC_REGISTERED))
if (!acpi_processor_cpufreq_init)
return -EINVAL;
mutex_lock(&performance_mutex);

82
drivers/acpi/processor_thermal.c
View File

@ -35,7 +35,6 @@ ACPI_MODULE_NAME("processor_thermal");
#define CPUFREQ_THERMAL_MAX_STEP 3
static DEFINE_PER_CPU(unsigned int, cpufreq_thermal_reduction_pctg);
static unsigned int acpi_thermal_cpufreq_is_init = 0;
#define reduction_pctg(cpu) \
per_cpu(cpufreq_thermal_reduction_pctg, phys_package_first_cpu(cpu))
@ -61,35 +60,11 @@ static int phys_package_first_cpu(int cpu)
static int cpu_has_cpufreq(unsigned int cpu)
{
struct cpufreq_policy policy;
if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
if (!acpi_processor_cpufreq_init || cpufreq_get_policy(&policy, cpu))
return 0;
return 1;
}
static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
unsigned long max_freq = 0;
if (event != CPUFREQ_ADJUST)
goto out;
max_freq = (
policy->cpuinfo.max_freq *
(100 - reduction_pctg(policy->cpu) * 20)
) / 100;
cpufreq_verify_within_limits(policy, 0, max_freq);
out:
return 0;
}
static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
.notifier_call = acpi_thermal_cpufreq_notifier,
};
static int cpufreq_get_max_state(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
@ -108,7 +83,10 @@ static int cpufreq_get_cur_state(unsigned int cpu)
static int cpufreq_set_cur_state(unsigned int cpu, int state)
{
int i;
struct cpufreq_policy *policy;
struct acpi_processor *pr;
unsigned long max_freq;
int i, ret;
if (!cpu_has_cpufreq(cpu))
return 0;
@ -121,33 +99,53 @@ static int cpufreq_set_cur_state(unsigned int cpu, int state)
* frequency.
*/
for_each_online_cpu(i) {
if (topology_physical_package_id(i) ==
if (topology_physical_package_id(i) !=
topology_physical_package_id(cpu))
cpufreq_update_policy(i);
continue;
pr = per_cpu(processors, i);
if (unlikely(!dev_pm_qos_request_active(&pr->thermal_req)))
continue;
policy = cpufreq_cpu_get(i);
if (!policy)
return -EINVAL;
max_freq = (policy->cpuinfo.max_freq * (100 - reduction_pctg(i) * 20)) / 100;
cpufreq_cpu_put(policy);
ret = dev_pm_qos_update_request(&pr->thermal_req, max_freq);
if (ret < 0) {
pr_warn("Failed to update thermal freq constraint: CPU%d (%d)\n",
pr->id, ret);
}
}
return 0;
}
void acpi_thermal_cpufreq_init(void)
void acpi_thermal_cpufreq_init(int cpu)
{
int i;
struct acpi_processor *pr = per_cpu(processors, cpu);
int ret;
i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
if (!i)
acpi_thermal_cpufreq_is_init = 1;
ret = dev_pm_qos_add_request(get_cpu_device(cpu),
&pr->thermal_req, DEV_PM_QOS_MAX_FREQUENCY,
INT_MAX);
if (ret < 0) {
pr_err("Failed to add freq constraint for CPU%d (%d)\n", cpu,
ret);
return;
}
}
void acpi_thermal_cpufreq_exit(void)
void acpi_thermal_cpufreq_exit(int cpu)
{
if (acpi_thermal_cpufreq_is_init)
cpufreq_unregister_notifier
(&acpi_thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
struct acpi_processor *pr = per_cpu(processors, cpu);
acpi_thermal_cpufreq_is_init = 0;
dev_pm_qos_remove_request(&pr->thermal_req);
}
#else /* ! CONFIG_CPU_FREQ */
static int cpufreq_get_max_state(unsigned int cpu)
{

2
drivers/base/arch_topology.c
View File

@ -174,7 +174,7 @@ init_cpu_capacity_callback(struct notifier_block *nb,
if (!raw_capacity)
return 0;
if (val != CPUFREQ_NOTIFY)
if (val != CPUFREQ_CREATE_POLICY)
return 0;
pr_debug("cpu_capacity: init cpu capacity for CPUs [%*pbl] (to_visit=%*pbl)\n",

51
drivers/cpufreq/cpufreq.c
View File

@ -1266,7 +1266,17 @@ static void cpufreq_policy_free(struct cpufreq_policy *policy)
DEV_PM_QOS_MAX_FREQUENCY);
dev_pm_qos_remove_notifier(dev, &policy->nb_min,
DEV_PM_QOS_MIN_FREQUENCY);
dev_pm_qos_remove_request(policy->max_freq_req);
if (policy->max_freq_req) {
/*
* CPUFREQ_CREATE_POLICY notification is sent only after
* successfully adding max_freq_req request.
*/
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_REMOVE_POLICY, policy);
dev_pm_qos_remove_request(policy->max_freq_req);
}
dev_pm_qos_remove_request(policy->min_freq_req);
kfree(policy->min_freq_req);
@ -1391,6 +1401,9 @@ static int cpufreq_online(unsigned int cpu)
ret);
goto out_destroy_policy;
}
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_CREATE_POLICY, policy);
}
if (cpufreq_driver->get && has_target()) {
@ -2347,15 +2360,13 @@ EXPORT_SYMBOL(cpufreq_get_policy);
* @policy: Policy object to modify.
* @new_policy: New policy data.
*
* Pass @new_policy to the cpufreq driver's ->verify() callback, run the
* installed policy notifiers for it with the CPUFREQ_ADJUST value, pass it to
* the driver's ->verify() callback again and run the notifiers for it again
* with the CPUFREQ_NOTIFY value. Next, copy the min and max parameters
* of @new_policy to @policy and either invoke the driver's ->setpolicy()
* callback (if present) or carry out a governor update for @policy. That is,
* run the current governor's ->limits() callback (if the governor field in
* @new_policy points to the same object as the one in @policy) or replace the
* governor for @policy with the new one stored in @new_policy.
* Pass @new_policy to the cpufreq driver's ->verify() callback. Next, copy the
* min and max parameters of @new_policy to @policy and either invoke the
* driver's ->setpolicy() callback (if present) or carry out a governor update
* for @policy. That is, run the current governor's ->limits() callback (if the
* governor field in @new_policy points to the same object as the one in
* @policy) or replace the governor for @policy with the new one stored in
* @new_policy.
*
* The cpuinfo part of @policy is not updated by this function.
*/
@ -2383,26 +2394,6 @@ int cpufreq_set_policy(struct cpufreq_policy *policy,
if (ret)
return ret;
/*
* The notifier-chain shall be removed once all the users of
* CPUFREQ_ADJUST are moved to use the QoS framework.
*/
/* adjust if necessary - all reasons */
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_ADJUST, new_policy);
/*
* verify the cpu speed can be set within this limit, which might be
* different to the first one
*/
ret = cpufreq_driver->verify(new_policy);
if (ret)
return ret;
/* notification of the new policy */
blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
CPUFREQ_NOTIFY, new_policy);
policy->min = new_policy->min;
policy->max = new_policy->max;
trace_cpu_frequency_limits(policy);

19
drivers/cpufreq/ppc_cbe_cpufreq.c
View File

@ -110,6 +110,13 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
#endif
policy->freq_table = cbe_freqs;
cbe_cpufreq_pmi_policy_init(policy);
return 0;
}
static int cbe_cpufreq_cpu_exit(struct cpufreq_policy *policy)
{
cbe_cpufreq_pmi_policy_exit(policy);
return 0;
}
@ -129,6 +136,7 @@ static struct cpufreq_driver cbe_cpufreq_driver = {
.verify = cpufreq_generic_frequency_table_verify,
.target_index = cbe_cpufreq_target,
.init = cbe_cpufreq_cpu_init,
.exit = cbe_cpufreq_cpu_exit,
.name = "cbe-cpufreq",
.flags = CPUFREQ_CONST_LOOPS,
};
@ -139,15 +147,24 @@ static struct cpufreq_driver cbe_cpufreq_driver = {
static int __init cbe_cpufreq_init(void)
{
int ret;
if (!machine_is(cell))
return -ENODEV;
return cpufreq_register_driver(&cbe_cpufreq_driver);
cbe_cpufreq_pmi_init();
ret = cpufreq_register_driver(&cbe_cpufreq_driver);
if (ret)
cbe_cpufreq_pmi_exit();
return ret;
}
static void __exit cbe_cpufreq_exit(void)
{
cpufreq_unregister_driver(&cbe_cpufreq_driver);
cbe_cpufreq_pmi_exit();
}
module_init(cbe_cpufreq_init);

8
drivers/cpufreq/ppc_cbe_cpufreq.h
View File

@ -20,6 +20,14 @@ int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode);
#if IS_ENABLED(CONFIG_CPU_FREQ_CBE_PMI)
extern bool cbe_cpufreq_has_pmi;
void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy);
void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy);
void cbe_cpufreq_pmi_init(void);
void cbe_cpufreq_pmi_exit(void);
#else
#define cbe_cpufreq_has_pmi (0)
static inline void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy) {}
static inline void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy) {}
static inline void cbe_cpufreq_pmi_init(void) {}
static inline void cbe_cpufreq_pmi_exit(void) {}
#endif

100
drivers/cpufreq/ppc_cbe_cpufreq_pmi.c
View File

@ -12,6 +12,7 @@
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/of_platform.h>
#include <linux/pm_qos.h>
#include <asm/processor.h>
#include <asm/prom.h>
@ -24,8 +25,6 @@
#include "ppc_cbe_cpufreq.h"
static u8 pmi_slow_mode_limit[MAX_CBE];
bool cbe_cpufreq_has_pmi = false;
EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
@ -65,64 +64,89 @@ EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);
static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
{
struct cpufreq_policy *policy;
struct dev_pm_qos_request *req;
u8 node, slow_mode;
int cpu, ret;
BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
node = pmi_msg.data1;
slow_mode = pmi_msg.data2;
pmi_slow_mode_limit[node] = slow_mode;
cpu = cbe_node_to_cpu(node);
pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
}
static int pmi_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
struct cpufreq_frequency_table *cbe_freqs = policy->freq_table;
u8 node;
/* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY
* policy events?)
*/
node = cbe_cpu_to_node(policy->cpu);
pr_debug("got notified, event=%lu, node=%u\n", event, node);
if (pmi_slow_mode_limit[node] != 0) {
pr_debug("limiting node %d to slow mode %d\n",
node, pmi_slow_mode_limit[node]);
cpufreq_verify_within_limits(policy, 0,
cbe_freqs[pmi_slow_mode_limit[node]].frequency);
policy = cpufreq_cpu_get(cpu);
if (!policy) {
pr_warn("cpufreq policy not found cpu%d\n", cpu);
return;
}
return 0;
}
req = policy->driver_data;
static struct notifier_block pmi_notifier_block = {
.notifier_call = pmi_notifier,
};
ret = dev_pm_qos_update_request(req,
policy->freq_table[slow_mode].frequency);
if (ret < 0)
pr_warn("Failed to update freq constraint: %d\n", ret);
else
pr_debug("limiting node %d to slow mode %d\n", node, slow_mode);
cpufreq_cpu_put(policy);
}
static struct pmi_handler cbe_pmi_handler = {
.type = PMI_TYPE_FREQ_CHANGE,
.handle_pmi_message = cbe_cpufreq_handle_pmi,
};
static int __init cbe_cpufreq_pmi_init(void)
void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy)
{
cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
struct dev_pm_qos_request *req;
int ret;
if (!cbe_cpufreq_has_pmi)
return -ENODEV;
return;
cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return;
return 0;
ret = dev_pm_qos_add_request(get_cpu_device(policy->cpu), req,
DEV_PM_QOS_MAX_FREQUENCY,
policy->freq_table[0].frequency);
if (ret < 0) {
pr_err("Failed to add freq constraint (%d)\n", ret);
kfree(req);
return;
}
policy->driver_data = req;
}
device_initcall(cbe_cpufreq_pmi_init);
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init);
void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy)
{
struct dev_pm_qos_request *req = policy->driver_data;
if (cbe_cpufreq_has_pmi) {
dev_pm_qos_remove_request(req);
kfree(req);
}
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_exit);
void cbe_cpufreq_pmi_init(void)
{
if (!pmi_register_handler(&cbe_pmi_handler))
cbe_cpufreq_has_pmi = true;
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_init);
void cbe_cpufreq_pmi_exit(void)
{
pmi_unregister_handler(&cbe_pmi_handler);
cbe_cpufreq_has_pmi = false;
}
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_exit);

77
drivers/macintosh/windfarm_cpufreq_clamp.c
View File

@ -3,9 +3,11 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <asm/prom.h>
@ -16,36 +18,24 @@
static int clamped;
static struct wf_control *clamp_control;
static int clamp_notifier_call(struct notifier_block *self,
unsigned long event, void *data)
{
struct cpufreq_policy *p = data;
unsigned long max_freq;
if (event != CPUFREQ_ADJUST)
return 0;
max_freq = clamped ? (p->cpuinfo.min_freq) : (p->cpuinfo.max_freq);
cpufreq_verify_within_limits(p, 0, max_freq);
return 0;
}
static struct notifier_block clamp_notifier = {
.notifier_call = clamp_notifier_call,
};
static struct dev_pm_qos_request qos_req;
static unsigned int min_freq, max_freq;
static int clamp_set(struct wf_control *ct, s32 value)
{
if (value)
unsigned int freq;
if (value) {
freq = min_freq;
printk(KERN_INFO "windfarm: Clamping CPU frequency to "
"minimum !\n");
else
} else {
freq = max_freq;
printk(KERN_INFO "windfarm: CPU frequency unclamped !\n");
}
clamped = value;
cpufreq_update_policy(0);
return 0;
return dev_pm_qos_update_request(&qos_req, freq);
}
static int clamp_get(struct wf_control *ct, s32 *value)
@ -74,27 +64,60 @@ static const struct wf_control_ops clamp_ops = {
static int __init wf_cpufreq_clamp_init(void)
{
struct cpufreq_policy *policy;
struct wf_control *clamp;
struct device *dev;
int ret;
policy = cpufreq_cpu_get(0);
if (!policy) {
pr_warn("%s: cpufreq policy not found cpu0\n", __func__);
return -EPROBE_DEFER;
}
min_freq = policy->cpuinfo.min_freq;
max_freq = policy->cpuinfo.max_freq;
cpufreq_cpu_put(policy);
dev = get_cpu_device(0);
if (unlikely(!dev)) {
pr_warn("%s: No cpu device for cpu0\n", __func__);
return -ENODEV;
}
clamp = kmalloc(sizeof(struct wf_control), GFP_KERNEL);
if (clamp == NULL)
return -ENOMEM;
cpufreq_register_notifier(&clamp_notifier, CPUFREQ_POLICY_NOTIFIER);
ret = dev_pm_qos_add_request(dev, &qos_req, DEV_PM_QOS_MAX_FREQUENCY,
max_freq);
if (ret < 0) {
pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
ret);
goto free;
}
clamp->ops = &clamp_ops;
clamp->name = "cpufreq-clamp";
if (wf_register_control(clamp))
ret = wf_register_control(clamp);
if (ret)
goto fail;
clamp_control = clamp;
return 0;
fail:
dev_pm_qos_remove_request(&qos_req);
free:
kfree(clamp);
return -ENODEV;
return ret;
}
static void __exit wf_cpufreq_clamp_exit(void)
{
if (clamp_control)
if (clamp_control) {
wf_unregister_control(clamp_control);
dev_pm_qos_remove_request(&qos_req);
}
}

110
drivers/thermal/cpu_cooling.c
View File

@ -16,6 +16,7 @@
#include <linux/err.h>
#include <linux/idr.h>
#include <linux/pm_opp.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/cpu_cooling.h>
@ -66,8 +67,6 @@ struct time_in_idle {
* @last_load: load measured by the latest call to cpufreq_get_requested_power()
* @cpufreq_state: integer value representing the current state of cpufreq
* cooling devices.
* @clipped_freq: integer value representing the absolute value of the clipped
* frequency.
* @max_level: maximum cooling level. One less than total number of valid
* cpufreq frequencies.
* @freq_table: Freq table in descending order of frequencies
@ -84,12 +83,12 @@ struct cpufreq_cooling_device {
int id;
u32 last_load;
unsigned int cpufreq_state;
unsigned int clipped_freq;
unsigned int max_level;
struct freq_table *freq_table; /* In descending order */
struct cpufreq_policy *policy;
struct list_head node;
struct time_in_idle *idle_time;
struct dev_pm_qos_request qos_req;
};
static DEFINE_IDA(cpufreq_ida);
@ -118,59 +117,6 @@ static unsigned long get_level(struct cpufreq_cooling_device *cpufreq_cdev,
return level - 1;
}
/**
* cpufreq_thermal_notifier - notifier callback for cpufreq policy change.
* @nb: struct notifier_block * with callback info.
* @event: value showing cpufreq event for which this function invoked.
* @data: callback-specific data
*
* Callback to hijack the notification on cpufreq policy transition.
* Every time there is a change in policy, we will intercept and
* update the cpufreq policy with thermal constraints.
*
* Return: 0 (success)
*/
static int cpufreq_thermal_notifier(struct notifier_block *nb,
unsigned long event, void *data)
{
struct cpufreq_policy *policy = data;
unsigned long clipped_freq;
struct cpufreq_cooling_device *cpufreq_cdev;
if (event != CPUFREQ_ADJUST)
return NOTIFY_DONE;
mutex_lock(&cooling_list_lock);
list_for_each_entry(cpufreq_cdev, &cpufreq_cdev_list, node) {
/*
* A new copy of the policy is sent to the notifier and can't
* compare that directly.
*/
if (policy->cpu != cpufreq_cdev->policy->cpu)
continue;
/*
* policy->max is the maximum allowed frequency defined by user
* and clipped_freq is the maximum that thermal constraints
* allow.
*
* If clipped_freq is lower than policy->max, then we need to
* readjust policy->max.
*
* But, if clipped_freq is greater than policy->max, we don't
* need to do anything.
*/
clipped_freq = cpufreq_cdev->clipped_freq;
if (policy->max > clipped_freq)
cpufreq_verify_within_limits(policy, 0, clipped_freq);
break;
}
mutex_unlock(&cooling_list_lock);
return NOTIFY_OK;
}
/**
* update_freq_table() - Update the freq table with power numbers
* @cpufreq_cdev: the cpufreq cooling device in which to update the table
@ -374,7 +320,6 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
unsigned int clip_freq;
/* Request state should be less than max_level */
if (WARN_ON(state > cpufreq_cdev->max_level))
@ -384,13 +329,10 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
if (cpufreq_cdev->cpufreq_state == state)
return 0;
clip_freq = cpufreq_cdev->freq_table[state].frequency;
cpufreq_cdev->cpufreq_state = state;
cpufreq_cdev->clipped_freq = clip_freq;
cpufreq_update_policy(cpufreq_cdev->policy->cpu);
return 0;
return dev_pm_qos_update_request(&cpufreq_cdev->qos_req,
cpufreq_cdev->freq_table[state].frequency);
}
/**
@ -554,11 +496,6 @@ static struct thermal_cooling_device_ops cpufreq_power_cooling_ops = {
.power2state = cpufreq_power2state,
};
/* Notifier for cpufreq policy change */
static struct notifier_block thermal_cpufreq_notifier_block = {
.notifier_call = cpufreq_thermal_notifier,
};
static unsigned int find_next_max(struct cpufreq_frequency_table *table,
unsigned int prev_max)
{
@ -596,9 +533,16 @@ __cpufreq_cooling_register(struct device_node *np,
struct cpufreq_cooling_device *cpufreq_cdev;
char dev_name[THERMAL_NAME_LENGTH];
unsigned int freq, i, num_cpus;
struct device *dev;
int ret;
struct thermal_cooling_device_ops *cooling_ops;
bool first;
dev = get_cpu_device(policy->cpu);
if (unlikely(!dev)) {
pr_warn("No cpu device for cpu %d\n", policy->cpu);
return ERR_PTR(-ENODEV);
}
if (IS_ERR_OR_NULL(policy)) {
pr_err("%s: cpufreq policy isn't valid: %p\n", __func__, policy);
@ -671,25 +615,29 @@ __cpufreq_cooling_register(struct device_node *np,
cooling_ops = &cpufreq_cooling_ops;
}
ret = dev_pm_qos_add_request(dev, &cpufreq_cdev->qos_req,
DEV_PM_QOS_MAX_FREQUENCY,
cpufreq_cdev->freq_table[0].frequency);
if (ret < 0) {
pr_err("%s: Failed to add freq constraint (%d)\n", __func__,
ret);
cdev = ERR_PTR(ret);
goto remove_ida;
}
cdev = thermal_of_cooling_device_register(np, dev_name, cpufreq_cdev,
cooling_ops);
if (IS_ERR(cdev))
goto remove_ida;
cpufreq_cdev->clipped_freq = cpufreq_cdev->freq_table[0].frequency;
goto remove_qos_req;
mutex_lock(&cooling_list_lock);
/* Register the notifier for first cpufreq cooling device */
first = list_empty(&cpufreq_cdev_list);
list_add(&cpufreq_cdev->node, &cpufreq_cdev_list);
mutex_unlock(&cooling_list_lock);
if (first)
cpufreq_register_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
return cdev;
remove_qos_req:
dev_pm_qos_remove_request(&cpufreq_cdev->qos_req);
remove_ida:
ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
free_table:
@ -777,7 +725,6 @@ EXPORT_SYMBOL_GPL(of_cpufreq_cooling_register);
void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
{
struct cpufreq_cooling_device *cpufreq_cdev;
bool last;
if (!cdev)
return;
@ -786,15 +733,10 @@ void cpufreq_cooling_unregister(struct thermal_cooling_device *cdev)
mutex_lock(&cooling_list_lock);
list_del(&cpufreq_cdev->node);
/* Unregister the notifier for the last cpufreq cooling device */
last = list_empty(&cpufreq_cdev_list);
mutex_unlock(&cooling_list_lock);
if (last)
cpufreq_unregister_notifier(&thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
thermal_cooling_device_unregister(cdev);
dev_pm_qos_remove_request(&cpufreq_cdev->qos_req);
ida_simple_remove(&cpufreq_ida, cpufreq_cdev->id);
kfree(cpufreq_cdev->idle_time);
kfree(cpufreq_cdev->freq_table);

21
drivers/video/fbdev/pxafb.c
View File

@ -1678,24 +1678,6 @@ pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
}
return 0;
}
static int
pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
{
struct pxafb_info *fbi = TO_INF(nb, freq_policy);
struct fb_var_screeninfo *var = &fbi->fb.var;
struct cpufreq_policy *policy = data;
switch (val) {
case CPUFREQ_ADJUST:
pr_debug("min dma period: %d ps, "
"new clock %d kHz\n", pxafb_display_dma_period(var),
policy->max);
/* TODO: fill in min/max values */
break;
}
return 0;
}
#endif
#ifdef CONFIG_PM
@ -2400,11 +2382,8 @@ static int pxafb_probe(struct platform_device *dev)
#ifdef CONFIG_CPU_FREQ
fbi->freq_transition.notifier_call = pxafb_freq_transition;
fbi->freq_policy.notifier_call = pxafb_freq_policy;
cpufreq_register_notifier(&fbi->freq_transition,
CPUFREQ_TRANSITION_NOTIFIER);
cpufreq_register_notifier(&fbi->freq_policy,
CPUFREQ_POLICY_NOTIFIER);
#endif
/*

1
drivers/video/fbdev/pxafb.h
View File

@ -162,7 +162,6 @@ struct pxafb_info {
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
struct notifier_block freq_policy;
#endif
struct regulator *lcd_supply;

27
drivers/video/fbdev/sa1100fb.c
View File

@ -1005,31 +1005,6 @@ sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
}
return 0;
}
static int
sa1100fb_freq_policy(struct notifier_block *nb, unsigned long val,
void *data)
{
struct sa1100fb_info *fbi = TO_INF(nb, freq_policy);
struct cpufreq_policy *policy = data;
switch (val) {
case CPUFREQ_ADJUST:
dev_dbg(fbi->dev, "min dma period: %d ps, "
"new clock %d kHz\n", sa1100fb_min_dma_period(fbi),
policy->max);
/* todo: fill in min/max values */
break;
case CPUFREQ_NOTIFY:
do {} while(0);
/* todo: panic if min/max values aren't fulfilled
* [can't really happen unless there's a bug in the
* CPU policy verififcation process *
*/
break;
}
return 0;
}
#endif
#ifdef CONFIG_PM
@ -1242,9 +1217,7 @@ static int sa1100fb_probe(struct platform_device *pdev)
#ifdef CONFIG_CPU_FREQ
fbi->freq_transition.notifier_call = sa1100fb_freq_transition;
fbi->freq_policy.notifier_call = sa1100fb_freq_policy;
cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
#endif
/* This driver cannot be unloaded at the moment */

1
drivers/video/fbdev/sa1100fb.h
View File

@ -64,7 +64,6 @@ struct sa1100fb_info {
#ifdef CONFIG_CPU_FREQ
struct notifier_block freq_transition;
struct notifier_block freq_policy;
#endif
const struct sa1100fb_mach_info *inf;

26
include/acpi/processor.h
View File

@ -4,6 +4,8 @@
#include <linux/kernel.h>
#include <linux/cpu.h>
#include <linux/cpufreq.h>
#include <linux/pm_qos.h>
#include <linux/thermal.h>
#include <asm/acpi.h>
@ -230,6 +232,8 @@ struct acpi_processor {
struct acpi_processor_limit limit;
struct thermal_cooling_device *cdev;
struct device *dev; /* Processor device. */
struct dev_pm_qos_request perflib_req;
struct dev_pm_qos_request thermal_req;
};
struct acpi_processor_errata {
@ -296,16 +300,22 @@ static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
/* in processor_perflib.c */
#ifdef CONFIG_CPU_FREQ
void acpi_processor_ppc_init(void);
void acpi_processor_ppc_exit(void);
extern bool acpi_processor_cpufreq_init;
void acpi_processor_ignore_ppc_init(void);
void acpi_processor_ppc_init(int cpu);
void acpi_processor_ppc_exit(int cpu);
void acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);
extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit);
#else
static inline void acpi_processor_ppc_init(void)
static inline void acpi_processor_ignore_ppc_init(void)
{
return;
}
static inline void acpi_processor_ppc_exit(void)
static inline void acpi_processor_ppc_init(int cpu)
{
return;
}
static inline void acpi_processor_ppc_exit(int cpu)
{
return;
}
@ -421,14 +431,14 @@ static inline int acpi_processor_hotplug(struct acpi_processor *pr)
int acpi_processor_get_limit_info(struct acpi_processor *pr);
extern const struct thermal_cooling_device_ops processor_cooling_ops;
#if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ)
void acpi_thermal_cpufreq_init(void);
void acpi_thermal_cpufreq_exit(void);
void acpi_thermal_cpufreq_init(int cpu);
void acpi_thermal_cpufreq_exit(int cpu);
#else
static inline void acpi_thermal_cpufreq_init(void)
static inline void acpi_thermal_cpufreq_init(int cpu)
{
return;
}
static inline void acpi_thermal_cpufreq_exit(void)
static inline void acpi_thermal_cpufreq_exit(int cpu)
{
return;
}

4
include/linux/cpufreq.h
View File

@ -456,8 +456,8 @@ static inline void cpufreq_resume(void) {}
#define CPUFREQ_POSTCHANGE (1)
/* Policy Notifiers */
#define CPUFREQ_ADJUST (0)
#define CPUFREQ_NOTIFY (1)
#define CPUFREQ_CREATE_POLICY (0)
#define CPUFREQ_REMOVE_POLICY (1)
#ifdef CONFIG_CPU_FREQ
int cpufreq_register_notifier(struct notifier_block *nb, unsigned int list);