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ACPI, cpuidle: Clarify C-state description in sysfs

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Add a new sysfs entry under cpuidle states. desc - can be used by driver to
communicate to userspace any specific information about the state.
This helps in identifying the exact hardware C-states behind the ACPI C-state
definition.

Idea is to export this through powertop, which will help to map the C-state
reported by powertop to actual hardware C-state.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi 2008-02-11 17:46:31 -08:00 committed by Len Brown
parent e760e716d4
commit 4fcb2fcd4d
6 changed files with 34 additions and 7 deletions
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2
arch/x86/kernel/acpi/cstate.c
View File

@ -126,6 +126,8 @@ int acpi_processor_ffh_cstate_probe(unsigned int cpu,
printk(KERN_DEBUG "Monitor-Mwait will be used to enter C-%d "
"state\n", cx->type);
}
snprintf(cx->desc, ACPI_CX_DESC_LEN, "ACPI FFH INTEL MWAIT 0x%x",
cx->address);
out:
set_cpus_allowed(current, saved_mask);

11
drivers/acpi/processor_idle.c
View File

@ -945,11 +945,16 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
* Otherwise, ignore this info and continue.
*/
cx.entry_method = ACPI_CSTATE_HALT;
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI HLT");
} else {
continue;
}
} else {
snprintf(cx.desc, ACPI_CX_DESC_LEN, "ACPI IOPORT 0x%x",
cx.address);
}
obj = &(element->package.elements[2]);
if (obj->type != ACPI_TYPE_INTEGER)
continue;
@ -1643,6 +1648,11 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
return -EINVAL;
}
for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
dev->states[i].name[0] = '\0';
dev->states[i].desc[0] = '\0';
}
for (i = 1; i < ACPI_PROCESSOR_MAX_POWER && i <= max_cstate; i++) {
cx = &pr->power.states[i];
state = &dev->states[count];
@ -1659,6 +1669,7 @@ static int acpi_processor_setup_cpuidle(struct acpi_processor *pr)
cpuidle_set_statedata(state, cx);
snprintf(state->name, CPUIDLE_NAME_LEN, "C%d", i);
strncpy(state->desc, cx->desc, CPUIDLE_DESC_LEN);
state->exit_latency = cx->latency;
state->target_residency = cx->latency * latency_factor;
state->power_usage = cx->power;

3
drivers/cpuidle/cpuidle.c
View File

@ -219,7 +219,8 @@ static void poll_idle_init(struct cpuidle_device *dev)
cpuidle_set_statedata(state, NULL);
snprintf(state->name, CPUIDLE_NAME_LEN, "C0 (poll idle)");
snprintf(state->name, CPUIDLE_NAME_LEN, "C0");
snprintf(state->desc, CPUIDLE_DESC_LEN, "CPUIDLE CORE POLL IDLE");
state->exit_latency = 0;
state->target_residency = 0;
state->power_usage = -1;

14
drivers/cpuidle/sysfs.c
View File

@ -218,16 +218,23 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
return sprintf(buf, "%u\n", state->_name);\
}
static ssize_t show_state_name(struct cpuidle_state *state, char *buf)
{
return sprintf(buf, "%s\n", state->name);
#define define_show_state_str_function(_name) \
static ssize_t show_state_##_name(struct cpuidle_state *state, char *buf) \
{ \
if (state->_name[0] == '\0')\
return sprintf(buf, "<null>\n");\
return sprintf(buf, "%s\n", state->_name);\
}
define_show_state_function(exit_latency)
define_show_state_function(power_usage)
define_show_state_function(usage)
define_show_state_function(time)
define_show_state_str_function(name)
define_show_state_str_function(desc)
define_one_state_ro(name, show_state_name);
define_one_state_ro(desc, show_state_desc);
define_one_state_ro(latency, show_state_exit_latency);
define_one_state_ro(power, show_state_power_usage);
define_one_state_ro(usage, show_state_usage);
@ -235,6 +242,7 @@ define_one_state_ro(time, show_state_time);
static struct attribute *cpuidle_state_default_attrs[] = {
&attr_name.attr,
&attr_desc.attr,
&attr_latency.attr,
&attr_power.attr,
&attr_usage.attr,

9
include/acpi/processor.h
View File

@ -32,9 +32,11 @@
#define DOMAIN_COORD_TYPE_SW_ANY 0xfd
#define DOMAIN_COORD_TYPE_HW_ALL 0xfe
#define ACPI_CSTATE_SYSTEMIO (0)
#define ACPI_CSTATE_FFH (1)
#define ACPI_CSTATE_HALT (2)
#define ACPI_CSTATE_SYSTEMIO 0
#define ACPI_CSTATE_FFH 1
#define ACPI_CSTATE_HALT 2
#define ACPI_CX_DESC_LEN 32
/* Power Management */
@ -74,6 +76,7 @@ struct acpi_processor_cx {
u64 time;
struct acpi_processor_cx_policy promotion;
struct acpi_processor_cx_policy demotion;
char desc[ACPI_CX_DESC_LEN];
};
struct acpi_processor_power {

2
include/linux/cpuidle.h
View File

@ -19,6 +19,7 @@
#define CPUIDLE_STATE_MAX 8
#define CPUIDLE_NAME_LEN 16
#define CPUIDLE_DESC_LEN 32
struct cpuidle_device;
@ -29,6 +30,7 @@ struct cpuidle_device;
struct cpuidle_state {
char name[CPUIDLE_NAME_LEN];
char desc[CPUIDLE_DESC_LEN];
void *driver_data;
unsigned int flags;