ACPI: add ACPI 3.0 _TPC _TSS _PTC throttling support
Luming Yu [Sat, 26 May 2007 14:49:58 +0000 (22:49 +0800)]
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>

drivers/acpi/processor_core.c
drivers/acpi/processor_throttling.c
include/acpi/processor.h

index f7de02a..7aefb7c 100644 (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));
index b334860..1bae2e4 100644 (file)
 #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;
index b4b0ffd..01d2f24 100644 (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 */