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ACPI: add ACPI 3.0 _TPC _TSS _PTC throttling support 

adds _TPC _TSS _PTC -- Throttling Present Capabilities

Signed-off-by: Luming Yu <luming.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Luming Yu 2007-05-26 22:49:58 +08:00 committed by Len Brown
parent f285e3d329
commit 01854e697a
3 changed files with 423 additions and 9 deletions
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6
drivers/acpi/processor_core.c
View File

@ -66,6 +66,7 @@
#define ACPI_PROCESSOR_FILE_LIMIT "limit"
#define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80
#define ACPI_PROCESSOR_NOTIFY_POWER 0x81
#define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82
#define ACPI_PROCESSOR_LIMIT_USER 0
#define ACPI_PROCESSOR_LIMIT_THERMAL 1
@ -84,6 +85,8 @@ static int acpi_processor_info_open_fs(struct inode *inode, struct file *file);
static void acpi_processor_notify(acpi_handle handle, u32 event, void *data);
static acpi_status acpi_processor_hotadd_init(acpi_handle handle, int *p_cpu);
static int acpi_processor_handle_eject(struct acpi_processor *pr);
extern int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
static struct acpi_driver acpi_processor_driver = {
.name = "processor",
@ -699,6 +702,9 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
acpi_processor_cst_has_changed(pr);
acpi_bus_generate_event(device, event, 0);
break;
case ACPI_PROCESSOR_NOTIFY_THROTTLING:
acpi_processor_tstate_has_changed(pr);
acpi_bus_generate_event(device, event, 0);
default:
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Unsupported event [0x%x]\n", event));

380
drivers/acpi/processor_throttling.c
View File

@ -44,10 +44,222 @@
#define _COMPONENT ACPI_PROCESSOR_COMPONENT
ACPI_MODULE_NAME("processor_throttling");
static int acpi_processor_get_throttling (struct acpi_processor *pr);
int acpi_processor_set_throttling (struct acpi_processor *pr, int state);
static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
{
acpi_status status = 0;
unsigned long tpc = 0;
if(!pr)
return -EINVAL;
status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
if(ACPI_FAILURE(status) && status != AE_NOT_FOUND){
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TPC"));
return -ENODEV;
}
pr->throttling_platform_limit = (int)tpc;
return 0;
}
int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
{
return acpi_processor_get_platform_limit(pr);
}
/* --------------------------------------------------------------------------
_PTC, _TSS, _TSD support
-------------------------------------------------------------------------- */
static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
{
int result = 0;
acpi_status status = 0;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *ptc = NULL;
union acpi_object obj = { 0 };
status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTC"));
return -ENODEV;
}
ptc = (union acpi_object *)buffer.pointer;
if (!ptc || (ptc->type != ACPI_TYPE_PACKAGE)
|| (ptc->package.count != 2)) {
printk(KERN_ERR PREFIX "Invalid _PTC data\n");
result = -EFAULT;
goto end;
}
/*
* control_register
*/
obj = ptc->package.elements[0];
if ((obj.type != ACPI_TYPE_BUFFER)
|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
|| (obj.buffer.pointer == NULL)) {
printk(KERN_ERR PREFIX "Invalid _PTC data (control_register)\n");
result = -EFAULT;
goto end;
}
memcpy(&pr->throttling.control_register, obj.buffer.pointer,
sizeof(struct acpi_ptc_register));
/*
* status_register
*/
obj = ptc->package.elements[1];
if ((obj.type != ACPI_TYPE_BUFFER)
|| (obj.buffer.length < sizeof(struct acpi_ptc_register))
|| (obj.buffer.pointer == NULL)) {
printk(KERN_ERR PREFIX "Invalid _PTC data (status_register)\n");
result = -EFAULT;
goto end;
}
memcpy(&pr->throttling.status_register, obj.buffer.pointer,
sizeof(struct acpi_ptc_register));
end:
kfree(buffer.pointer);
return result;
}
static int acpi_processor_get_throttling_states(struct acpi_processor *pr)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer format = { sizeof("NNNNN"), "NNNNN" };
struct acpi_buffer state = { 0, NULL };
union acpi_object *tss = NULL;
int i;
status = acpi_evaluate_object(pr->handle, "_TSS", NULL, &buffer);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _TSS"));
return -ENODEV;
}
tss = buffer.pointer;
if (!tss || (tss->type != ACPI_TYPE_PACKAGE)) {
printk(KERN_ERR PREFIX "Invalid _TSS data\n");
result = -EFAULT;
goto end;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
tss->package.count));
pr->throttling.state_count = tss->package.count;
pr->throttling.states_tss =
kmalloc(sizeof(struct acpi_processor_tx_tss) * tss->package.count,
GFP_KERNEL);
if (!pr->throttling.states_tss) {
result = -ENOMEM;
goto end;
}
for (i = 0; i < pr->throttling.state_count; i++) {
struct acpi_processor_tx_tss *tx = (struct acpi_processor_tx_tss *) &(pr->throttling.states_tss[i]);
state.length = sizeof(struct acpi_processor_tx_tss);
state.pointer = tx;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Extracting state %d\n", i));
status = acpi_extract_package(&(tss->package.elements[i]),
&format, &state);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid _TSS data"));
result = -EFAULT;
kfree(pr->throttling.states_tss);
goto end;
}
if (!tx->freqpercentage) {
printk(KERN_ERR PREFIX
"Invalid _TSS data: freq is zero\n");
result = -EFAULT;
kfree(pr->throttling.states_tss);
goto end;
}
}
end:
kfree(buffer.pointer);
return result;
}
static int acpi_processor_get_tsd(struct acpi_processor *pr)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
struct acpi_buffer format = {sizeof("NNNNN"), "NNNNN"};
struct acpi_buffer state = {0, NULL};
union acpi_object *tsd = NULL;
struct acpi_tsd_package *pdomain;
status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
if (ACPI_FAILURE(status)) {
return -ENODEV;
}
tsd = buffer.pointer;
if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
result = -EFAULT;
goto end;
}
if (tsd->package.count != 1) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
result = -EFAULT;
goto end;
}
pdomain = &(pr->throttling.domain_info);
state.length = sizeof(struct acpi_tsd_package);
state.pointer = pdomain;
status = acpi_extract_package(&(tsd->package.elements[0]),
&format, &state);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
result = -EFAULT;
goto end;
}
if (pdomain->num_entries != ACPI_TSD_REV0_ENTRIES) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:num_entries\n"));
result = -EFAULT;
goto end;
}
if (pdomain->revision != ACPI_TSD_REV0_REVISION) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unknown _TSD:revision\n"));
result = -EFAULT;
goto end;
}
end:
kfree(buffer.pointer);
return result;
}
/* --------------------------------------------------------------------------
Throttling Control
-------------------------------------------------------------------------- */
static int acpi_processor_get_throttling(struct acpi_processor *pr)
static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
{
int state = 0;
u32 value = 0;
@ -94,7 +306,101 @@ static int acpi_processor_get_throttling(struct acpi_processor *pr)
return 0;
}
int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
static int acpi_read_throttling_status(struct acpi_processor_throttling *throttling)
{
int value = -1;
switch (throttling->status_register.space_id) {
case ACPI_ADR_SPACE_SYSTEM_IO:
acpi_os_read_port((acpi_io_address)throttling->status_register.address,
&value,
(u32)throttling->status_register.bit_width*8);
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
printk(KERN_ERR PREFIX "HARDWARE addr space,NOT supported yet\n");
break;
default:
printk(KERN_ERR PREFIX "Unknown addr space %d\n",
(u32) (throttling->status_register.space_id));
}
return value;
}
static int acpi_write_throttling_state(struct acpi_processor_throttling *throttling,int value)
{
int ret = -1;
switch (throttling->control_register.space_id) {
case ACPI_ADR_SPACE_SYSTEM_IO:
acpi_os_write_port((acpi_io_address)throttling->control_register.address,
value,
(u32)throttling->control_register.bit_width*8);
ret = 0;
break;
case ACPI_ADR_SPACE_FIXED_HARDWARE:
printk(KERN_ERR PREFIX "HARDWARE addr space,NOT supported yet\n");
break;
default:
printk(KERN_ERR PREFIX "Unknown addr space %d\n",
(u32) (throttling->control_register.space_id));
}
return ret;
}
static int acpi_get_throttling_state(struct acpi_processor *pr,int value)
{
int i;
for (i = 0; i < pr->throttling.state_count; i++) {
struct acpi_processor_tx_tss *tx = (struct acpi_processor_tx_tss *) &(pr->throttling.states_tss[i]);
if(tx->control == value)
break;
}
if(i > pr->throttling.state_count)
i=-1;
return i;
}
static int acpi_get_throttling_value(struct acpi_processor *pr,int state)
{
int value = -1;
if(state >=0 && state <= pr->throttling.state_count){
struct acpi_processor_tx_tss *tx = (struct acpi_processor_tx_tss *) &(pr->throttling.states_tss[state]);
value = tx->control;
}
return value;
}
static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
{
int state = 0;
u32 value = 0;
if (!pr)
return -EINVAL;
if (!pr->flags.throttling)
return -ENODEV;
pr->throttling.state = 0;
local_irq_disable();
value = acpi_read_throttling_status(&pr->throttling);
if(value >= 0){
state = acpi_get_throttling_state(pr,value);
pr->throttling.state = state;
}
local_irq_enable();
return 0;
}
static int acpi_processor_get_throttling(struct acpi_processor *pr)
{
return pr->throttling.acpi_processor_get_throttling(pr);
}
int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, int state)
{
u32 value = 0;
u32 duty_mask = 0;
@ -113,6 +419,8 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
if (state == pr->throttling.state)
return 0;
if (state < pr->throttling_platform_limit)
return -EPERM;
/*
* Calculate the duty_value and duty_mask.
*/
@ -165,11 +473,50 @@ int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
return 0;
}
int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, int state)
{
u32 value = 0;
if (!pr)
return -EINVAL;
if ((state < 0) || (state > (pr->throttling.state_count - 1)))
return -EINVAL;
if (!pr->flags.throttling)
return -ENODEV;
if (state == pr->throttling.state)
return 0;
if (state < pr->throttling_platform_limit)
return -EPERM;
local_irq_disable();
value = acpi_get_throttling_value(pr,state);
if(value >=0){
acpi_write_throttling_state(&pr->throttling,value);
pr->throttling.state = state;
}
local_irq_enable();
return 0;
}
int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
{
return pr->throttling.acpi_processor_set_throttling(pr,state);
}
int acpi_processor_get_throttling_info(struct acpi_processor *pr)
{
int result = 0;
int step = 0;
int i = 0;
int no_ptc = 0;
int no_tss = 0;
int no_tsd = 0;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
@ -182,6 +529,17 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
return -EINVAL;
/* TBD: Support ACPI 2.0 objects */
no_ptc = acpi_processor_get_throttling_control(pr);
no_tss = acpi_processor_get_throttling_states(pr);
no_tsd = acpi_processor_get_tsd(pr);
if(no_ptc || no_tss) {
pr->throttling.acpi_processor_get_throttling = &acpi_processor_get_throttling_fadt;
pr->throttling.acpi_processor_set_throttling = &acpi_processor_set_throttling_fadt;
} else {
pr->throttling.acpi_processor_get_throttling = &acpi_processor_get_throttling_ptc;
pr->throttling.acpi_processor_set_throttling = &acpi_processor_set_throttling_ptc;
}
if (!pr->throttling.address) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
@ -280,15 +638,25 @@ static int acpi_processor_throttling_seq_show(struct seq_file *seq,
}
seq_printf(seq, "state count: %d\n"
"active state: T%d\n",
pr->throttling.state_count, pr->throttling.state);
"active state: T%d\n"
"state available: T%d to T%d\n",
pr->throttling.state_count, pr->throttling.state,
pr->throttling_platform_limit,
pr->throttling.state_count-1);
seq_puts(seq, "states:\n");
for (i = 0; i < pr->throttling.state_count; i++)
seq_printf(seq, " %cT%d: %02d%%\n",
if(acpi_processor_get_throttling == acpi_processor_get_throttling_fadt)
for (i = 0; i < pr->throttling.state_count; i++)
seq_printf(seq, " %cT%d: %02d%%\n",
(i == pr->throttling.state ? '*' : ' '), i,
(pr->throttling.states[i].performance ? pr->
throttling.states[i].performance / 10 : 0));
else
for (i = 0; i < pr->throttling.state_count; i++)
seq_printf(seq, " %cT%d: %02d%%\n",
(i == pr->throttling.state ? '*' : ' '), i,
(int)pr->throttling.states_tss[i].freqpercentage);
end:
return 0;

46
include/acpi/processor.h
View File

@ -21,6 +21,8 @@
#define ACPI_PSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
#define ACPI_PSD_REV0_ENTRIES 5
#define ACPI_TSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
#define ACPI_TSD_REV0_ENTRIES 5
/*
* Types of coordination defined in ACPI 3.0. Same macros can be used across
* P, C and T states
@ -125,17 +127,52 @@ struct acpi_processor_performance {
/* Throttling Control */
struct acpi_tsd_package {
acpi_integer num_entries;
acpi_integer revision;
acpi_integer domain;
acpi_integer coord_type;
acpi_integer num_processors;
} __attribute__ ((packed));
struct acpi_ptc_register {
u8 descriptor;
u16 length;
u8 space_id;
u8 bit_width;
u8 bit_offset;
u8 reserved;
u64 address;
} __attribute__ ((packed));
struct acpi_processor_tx_tss {
acpi_integer freqpercentage; /* */
acpi_integer power; /* milliWatts */
acpi_integer transition_latency; /* microseconds */
acpi_integer control; /* control value */
acpi_integer status; /* success indicator */
};
struct acpi_processor_tx {
u16 power;
u16 performance;
};
struct acpi_processor;
struct acpi_processor_throttling {
int state;
unsigned int state;
unsigned int platform_limit;
struct acpi_pct_register control_register;
struct acpi_pct_register status_register;
unsigned int state_count;
struct acpi_processor_tx_tss *states_tss;
struct acpi_tsd_package domain_info;
cpumask_t shared_cpu_map;
int (*acpi_processor_get_throttling) (struct acpi_processor *pr);
int (*acpi_processor_set_throttling) (struct acpi_processor *pr, int state);
u32 address;
u8 duty_offset;
u8 duty_width;
int state_count;
struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
};
@ -169,6 +206,9 @@ struct acpi_processor {
u32 id;
u32 pblk;
int performance_platform_limit;
int throttling_platform_limit;
/*0 - states 0..n-th satte available*/
struct acpi_processor_flags flags;
struct acpi_processor_power power;
struct acpi_processor_performance *performance;
@ -270,7 +310,7 @@ static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr)
/* in processor_throttling.c */
int acpi_processor_get_throttling_info(struct acpi_processor *pr);
int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
extern int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
extern struct file_operations acpi_processor_throttling_fops;
/* in processor_idle.c */