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[POWERPC] cbe_thermal: add throttling attributes to cpu and spu nodes

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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 2007-04-23 21:35:41 +02:00 committed by Arnd Bergmann
parent 24d560d7b9
commit 5f7bdaee2a
1 changed files with 154 additions and 1 deletions
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155
arch/powerpc/platforms/cell/cbe_thermal.c
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@ -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,
};