diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/platforms/pseries/pseries_energy.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/powerpc/platforms/pseries/pseries_energy.c | 323 |
1 files changed, 0 insertions, 323 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/pseries_energy.c b/ANDROID_3.4.5/arch/powerpc/platforms/pseries/pseries_energy.c deleted file mode 100644 index af281dce..00000000 --- a/ANDROID_3.4.5/arch/powerpc/platforms/pseries/pseries_energy.c +++ /dev/null @@ -1,323 +0,0 @@ -/* - * POWER platform energy management driver - * Copyright (C) 2010 IBM Corporation - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * version 2 as published by the Free Software Foundation. - * - * This pseries platform device driver provides access to - * platform energy management capabilities. - */ - -#include <linux/module.h> -#include <linux/types.h> -#include <linux/errno.h> -#include <linux/init.h> -#include <linux/seq_file.h> -#include <linux/device.h> -#include <linux/cpu.h> -#include <linux/of.h> -#include <asm/cputhreads.h> -#include <asm/page.h> -#include <asm/hvcall.h> - - -#define MODULE_VERS "1.0" -#define MODULE_NAME "pseries_energy" - -/* Driver flags */ - -static int sysfs_entries; - -/* Helper routines */ - -/* - * Routine to detect firmware support for hcall - * return 1 if H_BEST_ENERGY is supported - * else return 0 - */ - -static int check_for_h_best_energy(void) -{ - struct device_node *rtas = NULL; - const char *hypertas, *s; - int length; - int rc = 0; - - rtas = of_find_node_by_path("/rtas"); - if (!rtas) - return 0; - - hypertas = of_get_property(rtas, "ibm,hypertas-functions", &length); - if (!hypertas) { - of_node_put(rtas); - return 0; - } - - /* hypertas will have list of strings with hcall names */ - for (s = hypertas; s < hypertas + length; s += strlen(s) + 1) { - if (!strncmp("hcall-best-energy-1", s, 19)) { - rc = 1; /* Found the string */ - break; - } - } - of_node_put(rtas); - return rc; -} - -/* Helper Routines to convert between drc_index to cpu numbers */ - -static u32 cpu_to_drc_index(int cpu) -{ - struct device_node *dn = NULL; - const int *indexes; - int i; - int rc = 1; - u32 ret = 0; - - dn = of_find_node_by_path("/cpus"); - if (dn == NULL) - goto err; - indexes = of_get_property(dn, "ibm,drc-indexes", NULL); - if (indexes == NULL) - goto err_of_node_put; - /* Convert logical cpu number to core number */ - i = cpu_core_index_of_thread(cpu); - /* - * The first element indexes[0] is the number of drc_indexes - * returned in the list. Hence i+1 will get the drc_index - * corresponding to core number i. - */ - WARN_ON(i > indexes[0]); - ret = indexes[i + 1]; - rc = 0; - -err_of_node_put: - of_node_put(dn); -err: - if (rc) - printk(KERN_WARNING "cpu_to_drc_index(%d) failed", cpu); - return ret; -} - -static int drc_index_to_cpu(u32 drc_index) -{ - struct device_node *dn = NULL; - const int *indexes; - int i, cpu = 0; - int rc = 1; - - dn = of_find_node_by_path("/cpus"); - if (dn == NULL) - goto err; - indexes = of_get_property(dn, "ibm,drc-indexes", NULL); - if (indexes == NULL) - goto err_of_node_put; - /* - * First element in the array is the number of drc_indexes - * returned. Search through the list to find the matching - * drc_index and get the core number - */ - for (i = 0; i < indexes[0]; i++) { - if (indexes[i + 1] == drc_index) - break; - } - /* Convert core number to logical cpu number */ - cpu = cpu_first_thread_of_core(i); - rc = 0; - -err_of_node_put: - of_node_put(dn); -err: - if (rc) - printk(KERN_WARNING "drc_index_to_cpu(%d) failed", drc_index); - return cpu; -} - -/* - * pseries hypervisor call H_BEST_ENERGY provides hints to OS on - * preferred logical cpus to activate or deactivate for optimized - * energy consumption. - */ - -#define FLAGS_MODE1 0x004E200000080E01 -#define FLAGS_MODE2 0x004E200000080401 -#define FLAGS_ACTIVATE 0x100 - -static ssize_t get_best_energy_list(char *page, int activate) -{ - int rc, cnt, i, cpu; - unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; - unsigned long flags = 0; - u32 *buf_page; - char *s = page; - - buf_page = (u32 *) get_zeroed_page(GFP_KERNEL); - if (!buf_page) - return -ENOMEM; - - flags = FLAGS_MODE1; - if (activate) - flags |= FLAGS_ACTIVATE; - - rc = plpar_hcall9(H_BEST_ENERGY, retbuf, flags, 0, __pa(buf_page), - 0, 0, 0, 0, 0, 0); - if (rc != H_SUCCESS) { - free_page((unsigned long) buf_page); - return -EINVAL; - } - - cnt = retbuf[0]; - for (i = 0; i < cnt; i++) { - cpu = drc_index_to_cpu(buf_page[2*i+1]); - if ((cpu_online(cpu) && !activate) || - (!cpu_online(cpu) && activate)) - s += sprintf(s, "%d,", cpu); - } - if (s > page) { /* Something to show */ - s--; /* Suppress last comma */ - s += sprintf(s, "\n"); - } - - free_page((unsigned long) buf_page); - return s-page; -} - -static ssize_t get_best_energy_data(struct device *dev, - char *page, int activate) -{ - int rc; - unsigned long retbuf[PLPAR_HCALL9_BUFSIZE]; - unsigned long flags = 0; - - flags = FLAGS_MODE2; - if (activate) - flags |= FLAGS_ACTIVATE; - - rc = plpar_hcall9(H_BEST_ENERGY, retbuf, flags, - cpu_to_drc_index(dev->id), - 0, 0, 0, 0, 0, 0, 0); - - if (rc != H_SUCCESS) - return -EINVAL; - - return sprintf(page, "%lu\n", retbuf[1] >> 32); -} - -/* Wrapper functions */ - -static ssize_t cpu_activate_hint_list_show(struct device *dev, - struct device_attribute *attr, char *page) -{ - return get_best_energy_list(page, 1); -} - -static ssize_t cpu_deactivate_hint_list_show(struct device *dev, - struct device_attribute *attr, char *page) -{ - return get_best_energy_list(page, 0); -} - -static ssize_t percpu_activate_hint_show(struct device *dev, - struct device_attribute *attr, char *page) -{ - return get_best_energy_data(dev, page, 1); -} - -static ssize_t percpu_deactivate_hint_show(struct device *dev, - struct device_attribute *attr, char *page) -{ - return get_best_energy_data(dev, page, 0); -} - -/* - * Create sysfs interface: - * /sys/devices/system/cpu/pseries_activate_hint_list - * /sys/devices/system/cpu/pseries_deactivate_hint_list - * Comma separated list of cpus to activate or deactivate - * /sys/devices/system/cpu/cpuN/pseries_activate_hint - * /sys/devices/system/cpu/cpuN/pseries_deactivate_hint - * Per-cpu value of the hint - */ - -struct device_attribute attr_cpu_activate_hint_list = - __ATTR(pseries_activate_hint_list, 0444, - cpu_activate_hint_list_show, NULL); - -struct device_attribute attr_cpu_deactivate_hint_list = - __ATTR(pseries_deactivate_hint_list, 0444, - cpu_deactivate_hint_list_show, NULL); - -struct device_attribute attr_percpu_activate_hint = - __ATTR(pseries_activate_hint, 0444, - percpu_activate_hint_show, NULL); - -struct device_attribute attr_percpu_deactivate_hint = - __ATTR(pseries_deactivate_hint, 0444, - percpu_deactivate_hint_show, NULL); - -static int __init pseries_energy_init(void) -{ - int cpu, err; - struct device *cpu_dev; - - if (!check_for_h_best_energy()) { - printk(KERN_INFO "Hypercall H_BEST_ENERGY not supported\n"); - return 0; - } - /* Create the sysfs files */ - err = device_create_file(cpu_subsys.dev_root, - &attr_cpu_activate_hint_list); - if (!err) - err = device_create_file(cpu_subsys.dev_root, - &attr_cpu_deactivate_hint_list); - - if (err) - return err; - for_each_possible_cpu(cpu) { - cpu_dev = get_cpu_device(cpu); - err = device_create_file(cpu_dev, - &attr_percpu_activate_hint); - if (err) - break; - err = device_create_file(cpu_dev, - &attr_percpu_deactivate_hint); - if (err) - break; - } - - if (err) - return err; - - sysfs_entries = 1; /* Removed entries on cleanup */ - return 0; - -} - -static void __exit pseries_energy_cleanup(void) -{ - int cpu; - struct device *cpu_dev; - - if (!sysfs_entries) - return; - - /* Remove the sysfs files */ - device_remove_file(cpu_subsys.dev_root, &attr_cpu_activate_hint_list); - device_remove_file(cpu_subsys.dev_root, &attr_cpu_deactivate_hint_list); - - for_each_possible_cpu(cpu) { - cpu_dev = get_cpu_device(cpu); - sysfs_remove_file(&cpu_dev->kobj, - &attr_percpu_activate_hint.attr); - sysfs_remove_file(&cpu_dev->kobj, - &attr_percpu_deactivate_hint.attr); - } -} - -module_init(pseries_energy_init); -module_exit(pseries_energy_cleanup); -MODULE_DESCRIPTION("Driver for pSeries platform energy management"); -MODULE_AUTHOR("Vaidyanathan Srinivasan"); -MODULE_LICENSE("GPL"); |