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powerpc: Add support for new hcall H_BEST_ENERGY

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Create sysfs interface to export data from H_BEST_ENERGY hcall
that can be used by administrative tools on supported pseries
platforms for energy management	optimizations.

sys/device/system/cpu/pseries_(de)activate_hint_list and
sys/device/system/cpu/cpuN/pseries_(de)activate_hint will provide
hints for activation and deactivation of cpus respectively.

These hints are abstract number given by the hypervisor based
on the extended knowledge the hypervisor has regarding the
system topology and resource mappings.

The activate and the deactivate sysfs entry is for the two
distinct operations that we could do for energy savings.  When
we have more capacity than required, we could deactivate few
core to save energy.  The choice of the core to deactivate
will be based on /sys/devices/system/cpu/deactivate_hint_list.
The comma separated list of cpus (cores) will be the preferred
choice.  If we have to activate some of the deactivated cores,
then /sys/devices/system/cpu/activate_hint_list will be used.

The per-cpu file
/sys/device/system/cpu/cpuN/pseries_(de)activate_hint further
provide more fine grain information by exporting the value of
the hint itself.

Added new driver module
	arch/powerpc/platforms/pseries/pseries_energy.c
under new config option CONFIG_PSERIES_ENERGY

Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vaidyanathan Srinivasan 2010-10-06 08:37:09 +00:00 committed by Benjamin Herrenschmidt
parent 99d8670525
commit 5742bd8595
4 changed files with 339 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/powerpc/include/asm/hvcall.h
View File

@ -232,7 +232,8 @@
#define H_GET_EM_PARMS 0x2B8
#define H_SET_MPP 0x2D0
#define H_GET_MPP 0x2D4
#define MAX_HCALL_OPCODE H_GET_MPP
#define H_BEST_ENERGY 0x2F4
#define MAX_HCALL_OPCODE H_BEST_ENERGY
#ifndef __ASSEMBLY__

10
arch/powerpc/platforms/pseries/Kconfig
View File

@ -33,6 +33,16 @@ config PSERIES_MSI
depends on PCI_MSI && EEH
default y
config PSERIES_ENERGY
tristate "pSeries energy management capabilities driver"
depends on PPC_PSERIES
default y
help
Provides interface to platform energy management capabilities
on supported PSERIES platforms.
Provides: /sys/devices/system/cpu/pseries_(de)activation_hint_list
and /sys/devices/system/cpu/cpuN/pseries_(de)activation_hint
config SCANLOG
tristate "Scanlog dump interface"
depends on RTAS_PROC && PPC_PSERIES

1
arch/powerpc/platforms/pseries/Makefile
View File

@ -11,6 +11,7 @@ obj-$(CONFIG_EEH) += eeh.o eeh_cache.o eeh_driver.o eeh_event.o eeh_sysfs.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_PCI) += pci.o pci_dlpar.o
obj-$(CONFIG_PSERIES_MSI) += msi.o
obj-$(CONFIG_PSERIES_ENERGY) += pseries_energy.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug-cpu.o
obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o

326
arch/powerpc/platforms/pseries/pseries_energy.c Normal file
View File

@ -0,0 +1,326 @@
/*
* 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/sysdev.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 sys_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 sysdev_class *class,
struct sysdev_class_attribute *attr, char *page)
{
return get_best_energy_list(page, 1);
}
static ssize_t cpu_deactivate_hint_list_show(struct sysdev_class *class,
struct sysdev_class_attribute *attr, char *page)
{
return get_best_energy_list(page, 0);
}
static ssize_t percpu_activate_hint_show(struct sys_device *dev,
struct sysdev_attribute *attr, char *page)
{
return get_best_energy_data(dev, page, 1);
}
static ssize_t percpu_deactivate_hint_show(struct sys_device *dev,
struct sysdev_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 sysdev_class_attribute attr_cpu_activate_hint_list =
_SYSDEV_CLASS_ATTR(pseries_activate_hint_list, 0444,
cpu_activate_hint_list_show, NULL);
struct sysdev_class_attribute attr_cpu_deactivate_hint_list =
_SYSDEV_CLASS_ATTR(pseries_deactivate_hint_list, 0444,
cpu_deactivate_hint_list_show, NULL);
struct sysdev_attribute attr_percpu_activate_hint =
_SYSDEV_ATTR(pseries_activate_hint, 0444,
percpu_activate_hint_show, NULL);
struct sysdev_attribute attr_percpu_deactivate_hint =
_SYSDEV_ATTR(pseries_deactivate_hint, 0444,
percpu_deactivate_hint_show, NULL);
static int __init pseries_energy_init(void)
{
int cpu, err;
struct sys_device *cpu_sys_dev;
if (!check_for_h_best_energy()) {
printk(KERN_INFO "Hypercall H_BEST_ENERGY not supported\n");
return 0;
}
/* Create the sysfs files */
err = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
&attr_cpu_activate_hint_list.attr);
if (!err)
err = sysfs_create_file(&cpu_sysdev_class.kset.kobj,
&attr_cpu_deactivate_hint_list.attr);
if (err)
return err;
for_each_possible_cpu(cpu) {
cpu_sys_dev = get_cpu_sysdev(cpu);
err = sysfs_create_file(&cpu_sys_dev->kobj,
&attr_percpu_activate_hint.attr);
if (err)
break;
err = sysfs_create_file(&cpu_sys_dev->kobj,
&attr_percpu_deactivate_hint.attr);
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 sys_device *cpu_sys_dev;
if (!sysfs_entries)
return;
/* Remove the sysfs files */
sysfs_remove_file(&cpu_sysdev_class.kset.kobj,
&attr_cpu_activate_hint_list.attr);
sysfs_remove_file(&cpu_sysdev_class.kset.kobj,
&attr_cpu_deactivate_hint_list.attr);
for_each_possible_cpu(cpu) {
cpu_sys_dev = get_cpu_sysdev(cpu);
sysfs_remove_file(&cpu_sys_dev->kobj,
&attr_percpu_activate_hint.attr);
sysfs_remove_file(&cpu_sys_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");