adds _TPC,_TSS,_PTC support which support Throttling Present Capabilities
change for ACPI processor driver
signed-off-by: Luming Yu <Luming.yu@xxxxxxxxx>
--
drivers/acpi/processor_core.c | 6
drivers/acpi/processor_throttling.c | 380 +++++++++++++++++++++++++++++++++++-
include/acpi/processor.h | 46 ++++
3 files changed, 423 insertions(+), 9 deletions(-)
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index 60646dd..7dedf3b 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -67,6 +67,7 @@ #define ACPI_PROCESSOR_FILE_THROTTLING "
#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
@@ -85,6 +86,8 @@ static int acpi_processor_info_open_fs(s
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",
@@ -700,6 +703,9 @@ static void acpi_processor_notify(acpi_h
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));
diff --git a/drivers/acpi/processor_throttling.c
b/drivers/acpi/processor_throttling.c
index b334860..1bae2e4 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -44,10 +44,222 @@ #define ACPI_PROCESSOR_CLASS
#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
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
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
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(s
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
}
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;
diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 70f3209..500637d 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -21,6 +21,8 @@ #define ACPI_PDC_REVISION_ID 0x1
#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];
};
@@ -170,6 +207,9 @@ 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;
@@ -267,7 +307,7 @@ #endif /* CONFIG_CPU_FREQ */
/* 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 */
Attachment:
tpc.patch
Description: Binary data
