#include <linux/cpufreq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include <linux/sysdev.h>
#include <asm/uaccess.h>
#include <acpi/processor.h>
#include <acpi/acpi_drivers.h>
-#define ACPI_PROCESSOR_COMPONENT 0x01000000
#define ACPI_PROCESSOR_CLASS "processor"
-#define ACPI_PROCESSOR_DRIVER_NAME "ACPI Processor Driver"
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
-ACPI_MODULE_NAME("acpi_processor")
+ACPI_MODULE_NAME("processor_thermal");
/* --------------------------------------------------------------------------
Limit Interface
u16 px = 0;
u16 tx = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (!pr->flags.limit)
- return_VALUE(-ENODEV);
+ return -ENODEV;
if (pr->flags.throttling) {
if (pr->limit.user.tx > tx)
if (result)
printk(KERN_ERR PREFIX "Unable to set limit\n");
- return_VALUE(result);
+ return result;
}
#ifdef CONFIG_CPU_FREQ
* _any_ cpufreq driver and not only the acpi-cpufreq driver.
*/
-static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
+#define CPUFREQ_THERMAL_MIN_STEP 0
+#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;
static int cpu_has_cpufreq(unsigned int cpu)
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
- if (cpufreq_thermal_reduction_pctg[cpu] < 60) {
- cpufreq_thermal_reduction_pctg[cpu] += 20;
+ if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) <
+ CPUFREQ_THERMAL_MAX_STEP) {
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu)++;
cpufreq_update_policy(cpu);
return 0;
}
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
- if (cpufreq_thermal_reduction_pctg[cpu] > 20)
- cpufreq_thermal_reduction_pctg[cpu] -= 20;
+ if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) >
+ (CPUFREQ_THERMAL_MIN_STEP + 1))
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu)--;
else
- cpufreq_thermal_reduction_pctg[cpu] = 0;
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0;
cpufreq_update_policy(cpu);
/* We reached max freq again and can leave passive mode */
- return !cpufreq_thermal_reduction_pctg[cpu];
+ return !per_cpu(cpufreq_thermal_reduction_pctg, cpu);
}
static int acpi_thermal_cpufreq_notifier(struct notifier_block *nb,
if (event != CPUFREQ_ADJUST)
goto out;
- max_freq =
- (policy->cpuinfo.max_freq *
- (100 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
+ max_freq = (
+ policy->cpuinfo.max_freq *
+ (100 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
+ ) / 100;
cpufreq_verify_within_limits(policy, 0, max_freq);
.notifier_call = acpi_thermal_cpufreq_notifier,
};
+static int cpufreq_get_max_state(unsigned int cpu)
+{
+ if (!cpu_has_cpufreq(cpu))
+ return 0;
+
+ return CPUFREQ_THERMAL_MAX_STEP;
+}
+
+static int cpufreq_get_cur_state(unsigned int cpu)
+{
+ if (!cpu_has_cpufreq(cpu))
+ return 0;
+
+ return per_cpu(cpufreq_thermal_reduction_pctg, cpu);
+}
+
+static int cpufreq_set_cur_state(unsigned int cpu, int state)
+{
+ if (!cpu_has_cpufreq(cpu))
+ return 0;
+
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu) = state;
+ cpufreq_update_policy(cpu);
+ return 0;
+}
+
void acpi_thermal_cpufreq_init(void)
{
int i;
- for (i = 0; i < NR_CPUS; i++)
- cpufreq_thermal_reduction_pctg[i] = 0;
+ for (i = 0; i < nr_cpu_ids; i++)
+ if (cpu_present(i))
+ per_cpu(cpufreq_thermal_reduction_pctg, i) = 0;
i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
CPUFREQ_POLICY_NOTIFIER);
}
#else /* ! CONFIG_CPU_FREQ */
+static int cpufreq_get_max_state(unsigned int cpu)
+{
+ return 0;
+}
+
+static int cpufreq_get_cur_state(unsigned int cpu)
+{
+ return 0;
+}
+
+static int cpufreq_set_cur_state(unsigned int cpu, int state)
+{
+ return 0;
+}
static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
struct acpi_device *device = NULL;
int tx = 0, max_tx_px = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_set_thermal_limit");
if ((type < ACPI_PROCESSOR_LIMIT_NONE)
|| (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
- return_VALUE(-EINVAL);
+ return -EINVAL;
result = acpi_bus_get_device(handle, &device);
if (result)
- return_VALUE(result);
+ return result;
- pr = (struct acpi_processor *)acpi_driver_data(device);
+ pr = acpi_driver_data(device);
if (!pr)
- return_VALUE(-ENODEV);
+ return -ENODEV;
/* Thermal limits are always relative to the current Px/Tx state. */
if (pr->flags.throttling)
} else
result = 0;
if (max_tx_px)
- return_VALUE(1);
+ return 1;
else
- return_VALUE(result);
+ return result;
}
int acpi_processor_get_limit_info(struct acpi_processor *pr)
{
- ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
if (!pr)
- return_VALUE(-EINVAL);
+ return -EINVAL;
if (pr->flags.throttling)
pr->flags.limit = 1;
- return_VALUE(0);
+ return 0;
+}
+
+/* thermal coolign device callbacks */
+static int acpi_processor_max_state(struct acpi_processor *pr)
+{
+ int max_state = 0;
+
+ /*
+ * There exists four states according to
+ * cpufreq_thermal_reduction_ptg. 0, 1, 2, 3
+ */
+ max_state += cpufreq_get_max_state(pr->id);
+ if (pr->flags.throttling)
+ max_state += (pr->throttling.state_count -1);
+
+ return max_state;
}
+static int
+processor_get_max_state(struct thermal_cooling_device *cdev,
+ unsigned long *state)
+{
+ struct acpi_device *device = cdev->devdata;
+ struct acpi_processor *pr = acpi_driver_data(device);
+
+ if (!device || !pr)
+ return -EINVAL;
+
+ *state = acpi_processor_max_state(pr);
+ return 0;
+}
+
+static int
+processor_get_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long *cur_state)
+{
+ struct acpi_device *device = cdev->devdata;
+ struct acpi_processor *pr = acpi_driver_data(device);
+
+ if (!device || !pr)
+ return -EINVAL;
+
+ *cur_state = cpufreq_get_cur_state(pr->id);
+ if (pr->flags.throttling)
+ *cur_state += pr->throttling.state;
+ return 0;
+}
+
+static int
+processor_set_cur_state(struct thermal_cooling_device *cdev,
+ unsigned long state)
+{
+ struct acpi_device *device = cdev->devdata;
+ struct acpi_processor *pr = acpi_driver_data(device);
+ int result = 0;
+ int max_pstate;
+
+ if (!device || !pr)
+ return -EINVAL;
+
+ max_pstate = cpufreq_get_max_state(pr->id);
+
+ if (state > acpi_processor_max_state(pr))
+ return -EINVAL;
+
+ if (state <= max_pstate) {
+ if (pr->flags.throttling && pr->throttling.state)
+ result = acpi_processor_set_throttling(pr, 0);
+ cpufreq_set_cur_state(pr->id, state);
+ } else {
+ cpufreq_set_cur_state(pr->id, max_pstate);
+ result = acpi_processor_set_throttling(pr,
+ state - max_pstate);
+ }
+ return result;
+}
+
+struct thermal_cooling_device_ops processor_cooling_ops = {
+ .get_max_state = processor_get_max_state,
+ .get_cur_state = processor_get_cur_state,
+ .set_cur_state = processor_set_cur_state,
+};
/* /proc interface */
{
struct acpi_processor *pr = (struct acpi_processor *)seq->private;
- ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");
if (!pr)
goto end;
pr->limit.thermal.px, pr->limit.thermal.tx);
end:
- return_VALUE(0);
+ return 0;
}
static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
size_t count, loff_t * data)
{
int result = 0;
- struct seq_file *m = (struct seq_file *)file->private_data;
- struct acpi_processor *pr = (struct acpi_processor *)m->private;
+ struct seq_file *m = file->private_data;
+ struct acpi_processor *pr = m->private;
char limit_string[25] = { '\0' };
int px = 0;
int tx = 0;
- ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
if (!pr || (count > sizeof(limit_string) - 1)) {
- return_VALUE(-EINVAL);
+ return -EINVAL;
}
if (copy_from_user(limit_string, buffer, count)) {
- return_VALUE(-EFAULT);
+ return -EFAULT;
}
limit_string[count] = '\0';
if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
printk(KERN_ERR PREFIX "Invalid data format\n");
- return_VALUE(-EINVAL);
+ return -EINVAL;
}
if (pr->flags.throttling) {
if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
printk(KERN_ERR PREFIX "Invalid tx\n");
- return_VALUE(-EINVAL);
+ return -EINVAL;
}
pr->limit.user.tx = tx;
}
result = acpi_processor_apply_limit(pr);
- return_VALUE(count);
+ return count;
}
-struct file_operations acpi_processor_limit_fops = {
+const struct file_operations acpi_processor_limit_fops = {
+ .owner = THIS_MODULE,
.open = acpi_processor_limit_open_fs,
.read = seq_read,
.write = acpi_processor_write_limit,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff