[POWERPC] cbe_thermal: add throttling attributes to cpu and spu nodes
This patch adds some attributes the cpu and spu nodes: /sys/devices/system/[c|s]pu/[c|s]pu*/thermal/throttle_begin /sys/devices/system/[c|s]pu/[c|s]pu*/thermal/throttle_end /sys/devices/system/[c|s]pu/[c|s]pu*/thermal/throttle_full_stop Signed-off-by: Christian Krafft <krafft@de.ibm.com> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
This commit is contained in:
Christian Krafft
Arnd Bergmann
Родитель
24d560d7b9
Коммит
5f7bdaee2a
|
|
@ -1,6 +1,31 @@
|
|||
/*
|
||||
* thermal support for the cell processor
|
||||
*
|
||||
* This module adds some sysfs attributes to cpu and spu nodes.
|
||||
* Base for measurements are the digital thermal sensors (DTS)
|
||||
* located on the chip.
|
||||
* The accuracy is 2 degrees, starting from 65 up to 125 degrees celsius
|
||||
* The attributes can be found under
|
||||
* /sys/devices/system/cpu/cpuX/thermal
|
||||
* /sys/devices/system/spu/spuX/thermal
|
||||
*
|
||||
* The following attributes are added for each node:
|
||||
* temperature:
|
||||
* contains the current temperature measured by the DTS
|
||||
* throttle_begin:
|
||||
* throttling begins when temperature is greater or equal to
|
||||
* throttle_begin. Setting this value to 125 prevents throttling.
|
||||
* throttle_end:
|
||||
* throttling is being ceased, if the temperature is lower than
|
||||
* throttle_end. Due to a delay between applying throttling and
|
||||
* a reduced temperature this value should be less than throttle_begin.
|
||||
* A value equal to throttle_begin provides only a very little hysteresis.
|
||||
* throttle_full_stop:
|
||||
* If the temperatrue is greater or equal to throttle_full_stop,
|
||||
* full throttling is applied to the cpu or spu. This value should be
|
||||
* greater than throttle_begin and throttle_end. Setting this value to
|
||||
* 65 prevents the unit from running code at all.
|
||||
*
|
||||
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005
|
||||
*
|
||||
* Author: Christian Krafft <krafft@de.ibm.com>
|
||||
|
|
@ -31,9 +56,24 @@
|
|||
#include "cbe_regs.h"
|
||||
#include "spu_priv1_mmio.h"
|
||||
|
||||
#define TEMP_MIN 65
|
||||
#define TEMP_MAX 125
|
||||
|
||||
#define SYSDEV_PREFIX_ATTR(_prefix,_name,_mode) \
|
||||
struct sysdev_attribute attr_ ## _prefix ## _ ## _name = { \
|
||||
.attr = { .name = __stringify(_name), .mode = _mode }, \
|
||||
.show = _prefix ## _show_ ## _name, \
|
||||
.store = _prefix ## _store_ ## _name, \
|
||||
};
|
||||
|
||||
static inline u8 reg_to_temp(u8 reg_value)
|
||||
{
|
||||
return ((reg_value & 0x3f) << 1) + 65;
|
||||
return ((reg_value & 0x3f) << 1) + TEMP_MIN;
|
||||
}
|
||||
|
||||
static inline u8 temp_to_reg(u8 temp)
|
||||
{
|
||||
return ((temp - TEMP_MIN) >> 1) & 0x3f;
|
||||
}
|
||||
|
||||
static struct cbe_pmd_regs __iomem *get_pmd_regs(struct sys_device *sysdev)
|
||||
|
|
@ -73,6 +113,73 @@ static ssize_t spu_show_temp(struct sys_device *sysdev, char *buf)
|
|||
return sprintf(buf, "%d\n", reg_to_temp(value));
|
||||
}
|
||||
|
||||
static ssize_t show_throttle(struct cbe_pmd_regs __iomem *pmd_regs, char *buf, int pos)
|
||||
{
|
||||
u64 value;
|
||||
|
||||
value = in_be64(&pmd_regs->tm_tpr.val);
|
||||
/* access the corresponding byte */
|
||||
value >>= pos;
|
||||
value &= 0x3F;
|
||||
|
||||
return sprintf(buf, "%d\n", reg_to_temp(value));
|
||||
}
|
||||
|
||||
static ssize_t store_throttle(struct cbe_pmd_regs __iomem *pmd_regs, const char *buf, size_t size, int pos)
|
||||
{
|
||||
u64 reg_value;
|
||||
int temp;
|
||||
u64 new_value;
|
||||
int ret;
|
||||
|
||||
ret = sscanf(buf, "%u", &temp);
|
||||
|
||||
if (ret != 1 || temp < TEMP_MIN || temp > TEMP_MAX)
|
||||
return -EINVAL;
|
||||
|
||||
new_value = temp_to_reg(temp);
|
||||
|
||||
reg_value = in_be64(&pmd_regs->tm_tpr.val);
|
||||
|
||||
/* zero out bits for new value */
|
||||
reg_value &= ~(0xffull << pos);
|
||||
/* set bits to new value */
|
||||
reg_value |= new_value << pos;
|
||||
|
||||
out_be64(&pmd_regs->tm_tpr.val, reg_value);
|
||||
return size;
|
||||
}
|
||||
|
||||
static ssize_t spu_show_throttle_end(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(get_pmd_regs(sysdev), buf, 0);
|
||||
}
|
||||
|
||||
static ssize_t spu_show_throttle_begin(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(get_pmd_regs(sysdev), buf, 8);
|
||||
}
|
||||
|
||||
static ssize_t spu_show_throttle_full_stop(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(get_pmd_regs(sysdev), buf, 16);
|
||||
}
|
||||
|
||||
static ssize_t spu_store_throttle_end(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(get_pmd_regs(sysdev), buf, size, 0);
|
||||
}
|
||||
|
||||
static ssize_t spu_store_throttle_begin(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(get_pmd_regs(sysdev), buf, size, 8);
|
||||
}
|
||||
|
||||
static ssize_t spu_store_throttle_full_stop(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(get_pmd_regs(sysdev), buf, size, 16);
|
||||
}
|
||||
|
||||
static ssize_t ppe_show_temp(struct sys_device *sysdev, char *buf, int pos)
|
||||
{
|
||||
struct cbe_pmd_regs __iomem *pmd_regs;
|
||||
|
|
@ -100,13 +207,52 @@ static ssize_t ppe_show_temp1(struct sys_device *sysdev, char *buf)
|
|||
return ppe_show_temp(sysdev, buf, 0);
|
||||
}
|
||||
|
||||
static ssize_t ppe_show_throttle_end(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 32);
|
||||
}
|
||||
|
||||
static ssize_t ppe_show_throttle_begin(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 40);
|
||||
}
|
||||
|
||||
static ssize_t ppe_show_throttle_full_stop(struct sys_device *sysdev, char *buf)
|
||||
{
|
||||
return show_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, 48);
|
||||
}
|
||||
|
||||
static ssize_t ppe_store_throttle_end(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 32);
|
||||
}
|
||||
|
||||
static ssize_t ppe_store_throttle_begin(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 40);
|
||||
}
|
||||
|
||||
static ssize_t ppe_store_throttle_full_stop(struct sys_device *sysdev, const char *buf, size_t size)
|
||||
{
|
||||
return store_throttle(cbe_get_cpu_pmd_regs(sysdev->id), buf, size, 48);
|
||||
}
|
||||
|
||||
|
||||
static struct sysdev_attribute attr_spu_temperature = {
|
||||
.attr = {.name = "temperature", .mode = 0400 },
|
||||
.show = spu_show_temp,
|
||||
};
|
||||
|
||||
static SYSDEV_PREFIX_ATTR(spu, throttle_end, 0600);
|
||||
static SYSDEV_PREFIX_ATTR(spu, throttle_begin, 0600);
|
||||
static SYSDEV_PREFIX_ATTR(spu, throttle_full_stop, 0600);
|
||||
|
||||
|
||||
static struct attribute *spu_attributes[] = {
|
||||
&attr_spu_temperature.attr,
|
||||
&attr_spu_throttle_end.attr,
|
||||
&attr_spu_throttle_begin.attr,
|
||||
&attr_spu_throttle_full_stop.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
|
|
@ -125,9 +271,16 @@ static struct sysdev_attribute attr_ppe_temperature1 = {
|
|||
.show = ppe_show_temp1,
|
||||
};
|
||||
|
||||
static SYSDEV_PREFIX_ATTR(ppe, throttle_end, 0600);
|
||||
static SYSDEV_PREFIX_ATTR(ppe, throttle_begin, 0600);
|
||||
static SYSDEV_PREFIX_ATTR(ppe, throttle_full_stop, 0600);
|
||||
|
||||
static struct attribute *ppe_attributes[] = {
|
||||
&attr_ppe_temperature0.attr,
|
||||
&attr_ppe_temperature1.attr,
|
||||
&attr_ppe_throttle_end.attr,
|
||||
&attr_ppe_throttle_begin.attr,
|
||||
&attr_ppe_throttle_full_stop.attr,
|
||||
NULL,
|
||||
};
|
||||
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче