#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
#include <linux/sysdev.h>
#include <asm/uaccess.h>
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_thermal");
-/* --------------------------------------------------------------------------
- Limit Interface
- -------------------------------------------------------------------------- */
-static int acpi_processor_apply_limit(struct acpi_processor *pr)
-{
- int result = 0;
- u16 px = 0;
- u16 tx = 0;
-
-
- if (!pr)
- return -EINVAL;
-
- if (!pr->flags.limit)
- return -ENODEV;
-
- if (pr->flags.throttling) {
- if (pr->limit.user.tx > tx)
- tx = pr->limit.user.tx;
- if (pr->limit.thermal.tx > tx)
- tx = pr->limit.thermal.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));
-
- end:
- if (result)
- printk(KERN_ERR PREFIX "Unable to set limit\n");
-
- return result;
-}
-
#ifdef CONFIG_CPU_FREQ
/* If a passive cooling situation is detected, primarily CPUfreq is used, as it
return 1;
}
-static int acpi_thermal_cpufreq_increase(unsigned int cpu)
-{
- if (!cpu_has_cpufreq(cpu))
- return -ENODEV;
-
- 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 (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)
{
#endif
-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, max_tx_px = 0;
-
-
- if ((type < ACPI_PROCESSOR_LIMIT_NONE)
- || (type > ACPI_PROCESSOR_LIMIT_DECREMENT))
- return -EINVAL;
-
- result = acpi_bus_get_device(handle, &device);
- if (result)
- return result;
-
- pr = acpi_driver_data(device);
- if (!pr)
- return -ENODEV;
-
- /* Thermal limits are always relative to the current Px/Tx state. */
- if (pr->flags.throttling)
- pr->limit.thermal.tx = pr->throttling.state;
-
- /*
- * Our default policy is to only use throttling at the lowest
- * performance state.
- */
-
- tx = pr->limit.thermal.tx;
-
- switch (type) {
-
- case ACPI_PROCESSOR_LIMIT_NONE:
- do {
- result = acpi_thermal_cpufreq_decrease(pr->id);
- } while (!result);
- tx = 0;
- break;
-
- case ACPI_PROCESSOR_LIMIT_INCREMENT:
- /* if going up: P-states first, T-states later */
-
- result = acpi_thermal_cpufreq_increase(pr->id);
- if (!result)
- goto end;
- else if (result == -ERANGE)
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "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"));
- else
- tx++;
- }
- break;
-
- case ACPI_PROCESSOR_LIMIT_DECREMENT:
- /* if going down: T-states first, P-states later */
-
- if (pr->flags.throttling) {
- if (tx == 0) {
- max_tx_px = 1;
- ACPI_DEBUG_PRINT((ACPI_DB_INFO,
- "At minimum throttling state\n"));
- } else {
- tx--;
- goto end;
- }
- }
-
- result = acpi_thermal_cpufreq_decrease(pr->id);
- 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"));
- max_tx_px = 1;
- } else
- max_tx_px = 0;
-
- break;
- }
-
- end:
- if (pr->flags.throttling) {
- pr->limit.thermal.px = 0;
- pr->limit.thermal.tx = tx;
-
- result = acpi_processor_apply_limit(pr);
- if (result)
- 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));
- } else
- result = 0;
- if (max_tx_px)
- return 1;
- else
- return result;
-}
-
int acpi_processor_get_limit_info(struct acpi_processor *pr)
{
.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 = seq->private;
-
- if (!pr)
- goto end;
-
- if (!pr->flags.limit) {
- seq_puts(seq, "<not supported>\n");
- 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 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);
-}
-
-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 = file->private_data;
- struct acpi_processor *pr = m->private;
- char limit_string[25] = { '\0' };
- int px = 0;
- int tx = 0;
-
-
- if (!pr || (count > sizeof(limit_string) - 1)) {
- return -EINVAL;
- }
-
- if (copy_from_user(limit_string, buffer, count)) {
- return -EFAULT;
- }
-
- limit_string[count] = '\0';
-
- if (sscanf(limit_string, "%d:%d", &px, &tx) != 2) {
- printk(KERN_ERR PREFIX "Invalid data format\n");
- return -EINVAL;
- }
-
- if (pr->flags.throttling) {
- if ((tx < 0) || (tx > (pr->throttling.state_count - 1))) {
- printk(KERN_ERR PREFIX "Invalid tx\n");
- return -EINVAL;
- }
- pr->limit.user.tx = tx;
- }
-
- result = acpi_processor_apply_limit(pr);
-
- return count;
-}
-
-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.openpandora.org / pandora-kernel.git / blobdiff