#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("acpi_processor")
/* --------------------------------------------------------------------------
Limit Interface
-------------------------------------------------------------------------- */
-
-static int
-acpi_processor_apply_limit (
- struct acpi_processor* pr)
+static int acpi_processor_apply_limit(struct acpi_processor *pr)
{
- int result = 0;
- u16 px = 0;
- u16 tx = 0;
+ int result = 0;
+ u16 px = 0;
+ u16 tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_apply_limit");
pr->limit.state.px = px;
pr->limit.state.tx = tx;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Processor [%d] limit set to (P%d:T%d)\n",
- pr->id,
- pr->limit.state.px,
- pr->limit.state.tx));
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Processor [%d] limit set to (P%d:T%d)\n", pr->id,
+ pr->limit.state.px, pr->limit.state.tx));
-end:
+ end:
if (result)
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to set limit\n"));
return_VALUE(result);
}
-
#ifdef CONFIG_CPU_FREQ
/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
static unsigned int acpi_thermal_cpufreq_is_init = 0;
-
static int cpu_has_cpufreq(unsigned int cpu)
{
struct cpufreq_policy policy;
- if (!acpi_thermal_cpufreq_is_init)
- return -ENODEV;
- if (!cpufreq_get_policy(&policy, cpu))
- return -ENODEV;
- return 0;
+ if (!acpi_thermal_cpufreq_is_init || cpufreq_get_policy(&policy, cpu))
+ return 0;
+ return 1;
}
-
static int acpi_thermal_cpufreq_increase(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ERANGE;
}
-
static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
{
if (!cpu_has_cpufreq(cpu))
return -ENODEV;
- if (cpufreq_thermal_reduction_pctg[cpu] >= 20) {
+ if (cpufreq_thermal_reduction_pctg[cpu] > 20)
cpufreq_thermal_reduction_pctg[cpu] -= 20;
- cpufreq_update_policy(cpu);
- return 0;
- }
-
- return -ERANGE;
+ else
+ 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];
}
-
-static int acpi_thermal_cpufreq_notifier(
- struct notifier_block *nb,
- unsigned long event,
- void *data)
+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 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
+ max_freq =
+ (policy->cpuinfo.max_freq *
+ (100 - cpufreq_thermal_reduction_pctg[policy->cpu])) / 100;
cpufreq_verify_within_limits(policy, 0, max_freq);
- out:
+ out:
return 0;
}
-
static struct notifier_block acpi_thermal_cpufreq_notifier_block = {
.notifier_call = acpi_thermal_cpufreq_notifier,
};
-
-void acpi_thermal_cpufreq_init(void) {
+void acpi_thermal_cpufreq_init(void)
+{
int i;
- for (i=0; i<NR_CPUS; i++)
+ for (i = 0; i < NR_CPUS; i++)
cpufreq_thermal_reduction_pctg[i] = 0;
- i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+ i = cpufreq_register_notifier(&acpi_thermal_cpufreq_notifier_block,
+ CPUFREQ_POLICY_NOTIFIER);
if (!i)
acpi_thermal_cpufreq_is_init = 1;
}
-void acpi_thermal_cpufreq_exit(void) {
+void acpi_thermal_cpufreq_exit(void)
+{
if (acpi_thermal_cpufreq_is_init)
- cpufreq_unregister_notifier(&acpi_thermal_cpufreq_notifier_block, CPUFREQ_POLICY_NOTIFIER);
+ cpufreq_unregister_notifier
+ (&acpi_thermal_cpufreq_notifier_block,
+ CPUFREQ_POLICY_NOTIFIER);
acpi_thermal_cpufreq_is_init = 0;
}
-#else /* ! CONFIG_CPU_FREQ */
-
-static int acpi_thermal_cpufreq_increase(unsigned int cpu) { return -ENODEV; }
-static int acpi_thermal_cpufreq_decrease(unsigned int cpu) { return -ENODEV; }
+#else /* ! CONFIG_CPU_FREQ */
+static int acpi_thermal_cpufreq_increase(unsigned int cpu)
+{
+ return -ENODEV;
+}
+static int acpi_thermal_cpufreq_decrease(unsigned int cpu)
+{
+ return -ENODEV;
+}
#endif
-
-int
-acpi_processor_set_thermal_limit (
- acpi_handle handle,
- int type)
+int acpi_processor_set_thermal_limit(acpi_handle handle, int type)
{
- int result = 0;
- struct acpi_processor *pr = NULL;
- struct acpi_device *device = NULL;
- int tx = 0;
+ int result = 0;
+ struct acpi_processor *pr = NULL;
+ 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))
+ || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
return_VALUE(-EINVAL);
result = acpi_bus_get_device(handle, &device);
if (result)
return_VALUE(result);
- pr = (struct acpi_processor *) acpi_driver_data(device);
+ pr = (struct acpi_processor *)acpi_driver_data(device);
if (!pr)
return_VALUE(-ENODEV);
goto end;
else if (result == -ERANGE)
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "At maximum performance state\n"));
+ "At maximum performance state\n"));
if (pr->flags.throttling) {
if (tx == (pr->throttling.state_count - 1))
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "At maximum throttling state\n"));
+ "At maximum throttling state\n"));
else
tx++;
}
/* if going down: T-states first, P-states later */
if (pr->flags.throttling) {
- if (tx == 0)
+ if (tx == 0) {
+ max_tx_px = 1;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "At minimum throttling state\n"));
- else {
+ "At minimum throttling state\n"));
+ } else {
tx--;
goto end;
}
}
result = acpi_thermal_cpufreq_decrease(pr->id);
- if (result == -ERANGE)
+ if (result) {
+ /*
+ * We only could get -ERANGE, 1 or 0.
+ * In the first two cases we reached max freq again.
+ */
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "At minimum performance state\n"));
+ "At minimum performance state\n"));
+ max_tx_px = 1;
+ } else
+ max_tx_px = 0;
break;
}
-end:
+ end:
if (pr->flags.throttling) {
pr->limit.thermal.px = 0;
pr->limit.thermal.tx = tx;
"Unable to set thermal limit\n"));
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Thermal limit now (P%d:T%d)\n",
- pr->limit.thermal.px,
- pr->limit.thermal.tx));
+ pr->limit.thermal.px, pr->limit.thermal.tx));
} else
result = 0;
-
- return_VALUE(result);
+ if (max_tx_px)
+ return_VALUE(1);
+ else
+ return_VALUE(result);
}
-
-int
-acpi_processor_get_limit_info (
- struct acpi_processor *pr)
+int acpi_processor_get_limit_info(struct acpi_processor *pr)
{
ACPI_FUNCTION_TRACE("acpi_processor_get_limit_info");
return_VALUE(0);
}
-
/* /proc interface */
static int acpi_processor_limit_seq_show(struct seq_file *seq, void *offset)
{
- struct acpi_processor *pr = (struct acpi_processor *)seq->private;
+ struct acpi_processor *pr = (struct acpi_processor *)seq->private;
ACPI_FUNCTION_TRACE("acpi_processor_limit_seq_show");
}
seq_printf(seq, "active limit: P%d:T%d\n"
- "user limit: P%d:T%d\n"
- "thermal limit: P%d:T%d\n",
- pr->limit.state.px, pr->limit.state.tx,
- pr->limit.user.px, pr->limit.user.tx,
- pr->limit.thermal.px, pr->limit.thermal.tx);
+ "user limit: P%d:T%d\n"
+ "thermal limit: P%d:T%d\n",
+ pr->limit.state.px, pr->limit.state.tx,
+ pr->limit.user.px, pr->limit.user.tx,
+ pr->limit.thermal.px, pr->limit.thermal.tx);
-end:
+ end:
return_VALUE(0);
}
static int acpi_processor_limit_open_fs(struct inode *inode, struct file *file)
{
return single_open(file, acpi_processor_limit_seq_show,
- PDE(inode)->data);
+ PDE(inode)->data);
}
-ssize_t acpi_processor_write_limit (
- struct file *file,
- const char __user *buffer,
- size_t count,
- loff_t *data)
+static ssize_t acpi_processor_write_limit(struct file * file,
+ const char __user * buffer,
+ 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;
- char limit_string[25] = {'\0'};
- int px = 0;
- int tx = 0;
+ int result = 0;
+ struct seq_file *m = (struct seq_file *)file->private_data;
+ struct acpi_processor *pr = (struct acpi_processor *)m->private;
+ char limit_string[25] = { '\0' };
+ int px = 0;
+ int tx = 0;
ACPI_FUNCTION_TRACE("acpi_processor_write_limit");
return_VALUE(count);
}
-
struct file_operations acpi_processor_limit_fops = {
- .open = acpi_processor_limit_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+ .open = acpi_processor_limit_open_fs,
+ .read = seq_read,
+ .write = acpi_processor_write_limit,
+ .llseek = seq_lseek,
+ .release = single_release,
};
-
git://git.onelab.eu / linux-2.6.git / blobdiff