#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 PREFIX "ACPI: "
+
#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
-------------------------------------------------------------------------- */
-
-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");
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 (pr->limit.thermal.tx > tx)
tx = pr->limit.thermal.tx;
- result = acpi_processor_set_throttling(pr, tx);
+ result = acpi_processor_set_throttling(pr, tx, false);
if (result)
goto end;
}
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"));
+ printk(KERN_ERR PREFIX "Unable to set limit\n");
- return_VALUE(result);
+ return result;
}
-
#ifdef CONFIG_CPU_FREQ
/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
* _any_ cpufreq driver and not only the acpi-cpufreq driver.
*/
-static unsigned int cpufreq_thermal_reduction_pctg[NR_CPUS];
-static unsigned int acpi_thermal_cpufreq_is_init = 0;
+#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)
{
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 -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;
}
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) {
- cpufreq_thermal_reduction_pctg[cpu] -= 20;
- cpufreq_update_policy(cpu);
- return 0;
- }
-
- return -ERANGE;
+ if (per_cpu(cpufreq_thermal_reduction_pctg, cpu) >
+ (CPUFREQ_THERMAL_MIN_STEP + 1))
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu)--;
+ else
+ per_cpu(cpufreq_thermal_reduction_pctg, cpu) = 0;
+ cpufreq_update_policy(cpu);
+ /* We reached max freq again and can leave passive mode */
+ return !per_cpu(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 - per_cpu(cpufreq_thermal_reduction_pctg, policy->cpu) * 20)
+ ) / 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,
};
+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) {
+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);
+ 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 */
+#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 acpi_thermal_cpufreq_increase(unsigned int cpu) { return -ENODEV; }
-static int acpi_thermal_cpufreq_decrease(unsigned int cpu) { return -ENODEV; }
+static int cpufreq_set_cur_state(unsigned int cpu, int state)
+{
+ return 0;
+}
+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))
- return_VALUE(-EINVAL);
+ || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
+ 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)
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;
result = acpi_processor_apply_limit(pr);
if (result)
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
- "Unable to set thermal limit\n"));
+ printk(KERN_ERR PREFIX "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 1;
+ else
+ return 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");
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;
-/* /proc interface */
+ /*
+ * 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, false);
+ 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, false);
+ }
+ 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 */
+#ifdef CONFIG_ACPI_PROCFS
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");
if (!pr)
goto end;
}
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);
-
-end:
- return_VALUE(0);
+ "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:
+ return 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 = 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)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid argument\n"));
- return_VALUE(-EINVAL);
+ return -EINVAL;
}
if (copy_from_user(limit_string, buffer, count)) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data\n"));
- return_VALUE(-EFAULT);
+ return -EFAULT;
}
limit_string[count] = '\0';
if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid data format\n"));
- return_VALUE(-EINVAL);
+ printk(KERN_ERR PREFIX "Invalid data format\n");
+ return -EINVAL;
}
if (pr->flags.throttling) {
if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
- ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid tx\n"));
- return_VALUE(-EINVAL);
+ printk(KERN_ERR PREFIX "Invalid tx\n");
+ 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 = {
- .open = acpi_processor_limit_open_fs,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
+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,
+ .llseek = seq_lseek,
+ .release = single_release,
};
-
+#endif
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff