Merge branch 'acpi-lpss' into acpi-cleanup
[linux-3.10.git] / drivers / acpi / processor_throttling.c
index 0b8204e..1d02b7b 100644 (file)
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/slab.h>
 #include <linux/init.h>
+#include <linux/sched.h>
 #include <linux/cpufreq.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
 
 #include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
 #include <acpi/processor.h>
 
-#define ACPI_PROCESSOR_COMPONENT        0x01000000
+#define PREFIX "ACPI: "
+
 #define ACPI_PROCESSOR_CLASS            "processor"
 #define _COMPONENT              ACPI_PROCESSOR_COMPONENT
 ACPI_MODULE_NAME("processor_throttling");
 
+/* ignore_tpc:
+ *  0 -> acpi processor driver doesn't ignore _TPC values
+ *  1 -> acpi processor driver ignores _TPC values
+ */
+static int ignore_tpc;
+module_param(ignore_tpc, int, 0644);
+MODULE_PARM_DESC(ignore_tpc, "Disable broken BIOS _TPC throttling support");
+
+struct throttling_tstate {
+       unsigned int cpu;               /* cpu nr */
+       int target_state;               /* target T-state */
+};
+
+#define THROTTLING_PRECHANGE       (1)
+#define THROTTLING_POSTCHANGE      (2)
+
 static int acpi_processor_get_throttling(struct acpi_processor *pr);
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state);
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                               int state, bool force);
+
+static int acpi_processor_update_tsd_coord(void)
+{
+       int count, count_target;
+       int retval = 0;
+       unsigned int i, j;
+       cpumask_var_t covered_cpus;
+       struct acpi_processor *pr, *match_pr;
+       struct acpi_tsd_package *pdomain, *match_pdomain;
+       struct acpi_processor_throttling *pthrottling, *match_pthrottling;
+
+       if (!zalloc_cpumask_var(&covered_cpus, GFP_KERNEL))
+               return -ENOMEM;
+
+       /*
+        * Now that we have _TSD data from all CPUs, lets setup T-state
+        * coordination between all CPUs.
+        */
+       for_each_possible_cpu(i) {
+               pr = per_cpu(processors, i);
+               if (!pr)
+                       continue;
+
+               /* Basic validity check for domain info */
+               pthrottling = &(pr->throttling);
+
+               /*
+                * If tsd package for one cpu is invalid, the coordination
+                * among all CPUs is thought as invalid.
+                * Maybe it is ugly.
+                */
+               if (!pthrottling->tsd_valid_flag) {
+                       retval = -EINVAL;
+                       break;
+               }
+       }
+       if (retval)
+               goto err_ret;
+
+       for_each_possible_cpu(i) {
+               pr = per_cpu(processors, i);
+               if (!pr)
+                       continue;
+
+               if (cpumask_test_cpu(i, covered_cpus))
+                       continue;
+               pthrottling = &pr->throttling;
+
+               pdomain = &(pthrottling->domain_info);
+               cpumask_set_cpu(i, pthrottling->shared_cpu_map);
+               cpumask_set_cpu(i, covered_cpus);
+               /*
+                * If the number of processor in the TSD domain is 1, it is
+                * unnecessary to parse the coordination for this CPU.
+                */
+               if (pdomain->num_processors <= 1)
+                       continue;
+
+               /* Validate the Domain info */
+               count_target = pdomain->num_processors;
+               count = 1;
+
+               for_each_possible_cpu(j) {
+                       if (i == j)
+                               continue;
+
+                       match_pr = per_cpu(processors, j);
+                       if (!match_pr)
+                               continue;
+
+                       match_pthrottling = &(match_pr->throttling);
+                       match_pdomain = &(match_pthrottling->domain_info);
+                       if (match_pdomain->domain != pdomain->domain)
+                               continue;
+
+                       /* Here i and j are in the same domain.
+                        * If two TSD packages have the same domain, they
+                        * should have the same num_porcessors and
+                        * coordination type. Otherwise it will be regarded
+                        * as illegal.
+                        */
+                       if (match_pdomain->num_processors != count_target) {
+                               retval = -EINVAL;
+                               goto err_ret;
+                       }
+
+                       if (pdomain->coord_type != match_pdomain->coord_type) {
+                               retval = -EINVAL;
+                               goto err_ret;
+                       }
+
+                       cpumask_set_cpu(j, covered_cpus);
+                       cpumask_set_cpu(j, pthrottling->shared_cpu_map);
+                       count++;
+               }
+               for_each_possible_cpu(j) {
+                       if (i == j)
+                               continue;
+
+                       match_pr = per_cpu(processors, j);
+                       if (!match_pr)
+                               continue;
+
+                       match_pthrottling = &(match_pr->throttling);
+                       match_pdomain = &(match_pthrottling->domain_info);
+                       if (match_pdomain->domain != pdomain->domain)
+                               continue;
+
+                       /*
+                        * If some CPUS have the same domain, they
+                        * will have the same shared_cpu_map.
+                        */
+                       cpumask_copy(match_pthrottling->shared_cpu_map,
+                                    pthrottling->shared_cpu_map);
+               }
+       }
+
+err_ret:
+       free_cpumask_var(covered_cpus);
+
+       for_each_possible_cpu(i) {
+               pr = per_cpu(processors, i);
+               if (!pr)
+                       continue;
+
+               /*
+                * Assume no coordination on any error parsing domain info.
+                * The coordination type will be forced as SW_ALL.
+                */
+               if (retval) {
+                       pthrottling = &(pr->throttling);
+                       cpumask_clear(pthrottling->shared_cpu_map);
+                       cpumask_set_cpu(i, pthrottling->shared_cpu_map);
+                       pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
+               }
+       }
+
+       return retval;
+}
+
+/*
+ * Update the T-state coordination after the _TSD
+ * data for all cpus is obtained.
+ */
+void acpi_processor_throttling_init(void)
+{
+       if (acpi_processor_update_tsd_coord())
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                       "Assume no T-state coordination\n"));
+
+       return;
+}
+
+static int acpi_processor_throttling_notifier(unsigned long event, void *data)
+{
+       struct throttling_tstate *p_tstate = data;
+       struct acpi_processor *pr;
+       unsigned int cpu ;
+       int target_state;
+       struct acpi_processor_limit *p_limit;
+       struct acpi_processor_throttling *p_throttling;
+
+       cpu = p_tstate->cpu;
+       pr = per_cpu(processors, cpu);
+       if (!pr) {
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid pr pointer\n"));
+               return 0;
+       }
+       if (!pr->flags.throttling) {
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Throttling control is "
+                               "unsupported on CPU %d\n", cpu));
+               return 0;
+       }
+       target_state = p_tstate->target_state;
+       p_throttling = &(pr->throttling);
+       switch (event) {
+       case THROTTLING_PRECHANGE:
+               /*
+                * Prechange event is used to choose one proper t-state,
+                * which meets the limits of thermal, user and _TPC.
+                */
+               p_limit = &pr->limit;
+               if (p_limit->thermal.tx > target_state)
+                       target_state = p_limit->thermal.tx;
+               if (p_limit->user.tx > target_state)
+                       target_state = p_limit->user.tx;
+               if (pr->throttling_platform_limit > target_state)
+                       target_state = pr->throttling_platform_limit;
+               if (target_state >= p_throttling->state_count) {
+                       printk(KERN_WARNING
+                               "Exceed the limit of T-state \n");
+                       target_state = p_throttling->state_count - 1;
+               }
+               p_tstate->target_state = target_state;
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PreChange Event:"
+                               "target T-state of CPU %d is T%d\n",
+                               cpu, target_state));
+               break;
+       case THROTTLING_POSTCHANGE:
+               /*
+                * Postchange event is only used to update the
+                * T-state flag of acpi_processor_throttling.
+                */
+               p_throttling->state = target_state;
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PostChange Event:"
+                               "CPU %d is switched to T%d\n",
+                               cpu, target_state));
+               break;
+       default:
+               printk(KERN_WARNING
+                       "Unsupported Throttling notifier event\n");
+               break;
+       }
+
+       return 0;
+}
 
 /*
  * _TPC - Throttling Present Capabilities
@@ -53,10 +288,14 @@ 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;
+       unsigned long long tpc = 0;
 
        if (!pr)
                return -EINVAL;
+
+       if (ignore_tpc)
+               goto end;
+
        status = acpi_evaluate_integer(pr->handle, "_TPC", NULL, &tpc);
        if (ACPI_FAILURE(status)) {
                if (status != AE_NOT_FOUND) {
@@ -64,16 +303,121 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr)
                }
                return -ENODEV;
        }
+
+end:
        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);
+       int result = 0;
+       int throttling_limit;
+       int current_state;
+       struct acpi_processor_limit *limit;
+       int target_state;
+
+       if (ignore_tpc)
+               return 0;
+
+       result = acpi_processor_get_platform_limit(pr);
+       if (result) {
+               /* Throttling Limit is unsupported */
+               return result;
+       }
+
+       throttling_limit = pr->throttling_platform_limit;
+       if (throttling_limit >= pr->throttling.state_count) {
+               /* Uncorrect Throttling Limit */
+               return -EINVAL;
+       }
+
+       current_state = pr->throttling.state;
+       if (current_state > throttling_limit) {
+               /*
+                * The current state can meet the requirement of
+                * _TPC limit. But it is reasonable that OSPM changes
+                * t-states from high to low for better performance.
+                * Of course the limit condition of thermal
+                * and user should be considered.
+                */
+               limit = &pr->limit;
+               target_state = throttling_limit;
+               if (limit->thermal.tx > target_state)
+                       target_state = limit->thermal.tx;
+               if (limit->user.tx > target_state)
+                       target_state = limit->user.tx;
+       } else if (current_state == throttling_limit) {
+               /*
+                * Unnecessary to change the throttling state
+                */
+               return 0;
+       } else {
+               /*
+                * If the current state is lower than the limit of _TPC, it
+                * will be forced to switch to the throttling state defined
+                * by throttling_platfor_limit.
+                * Because the previous state meets with the limit condition
+                * of thermal and user, it is unnecessary to check it again.
+                */
+               target_state = throttling_limit;
+       }
+       return acpi_processor_set_throttling(pr, target_state, false);
 }
 
 /*
+ * This function is used to reevaluate whether the T-state is valid
+ * after one CPU is onlined/offlined.
+ * It is noted that it won't reevaluate the following properties for
+ * the T-state.
+ *     1. Control method.
+ *     2. the number of supported T-state
+ *     3. TSD domain
+ */
+void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
+                                       unsigned long action)
+{
+       int result = 0;
+
+       if (action == CPU_DEAD) {
+               /* When one CPU is offline, the T-state throttling
+                * will be invalidated.
+                */
+               pr->flags.throttling = 0;
+               return;
+       }
+       /* the following is to recheck whether the T-state is valid for
+        * the online CPU
+        */
+       if (!pr->throttling.state_count) {
+               /* If the number of T-state is invalid, it is
+                * invalidated.
+                */
+               pr->flags.throttling = 0;
+               return;
+       }
+       pr->flags.throttling = 1;
+
+       /* Disable throttling (if enabled).  We'll let subsequent
+        * policy (e.g.thermal) decide to lower performance if it
+        * so chooses, but for now we'll crank up the speed.
+        */
+
+       result = acpi_processor_get_throttling(pr);
+       if (result)
+               goto end;
+
+       if (pr->throttling.state) {
+               result = acpi_processor_set_throttling(pr, 0, false);
+               if (result)
+                       goto end;
+       }
+
+end:
+       if (result)
+               pr->flags.throttling = 0;
+}
+/*
  * _PTC - Processor Throttling Control (and status) register location
  */
 static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
@@ -83,6 +427,7 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
        struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
        union acpi_object *ptc = NULL;
        union acpi_object obj = { 0 };
+       struct acpi_processor_throttling *throttling;
 
        status = acpi_evaluate_object(pr->handle, "_PTC", NULL, &buffer);
        if (ACPI_FAILURE(status)) {
@@ -134,6 +479,22 @@ static int acpi_processor_get_throttling_control(struct acpi_processor *pr)
        memcpy(&pr->throttling.status_register, obj.buffer.pointer,
               sizeof(struct acpi_ptc_register));
 
+       throttling = &pr->throttling;
+
+       if ((throttling->control_register.bit_width +
+               throttling->control_register.bit_offset) > 32) {
+               printk(KERN_ERR PREFIX "Invalid _PTC control register\n");
+               result = -EFAULT;
+               goto end;
+       }
+
+       if ((throttling->status_register.bit_width +
+               throttling->status_register.bit_offset) > 32) {
+               printk(KERN_ERR PREFIX "Invalid _PTC status register\n");
+               result = -EFAULT;
+               goto end;
+       }
+
       end:
        kfree(buffer.pointer);
 
@@ -227,6 +588,10 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
        struct acpi_buffer state = { 0, NULL };
        union acpi_object *tsd = NULL;
        struct acpi_tsd_package *pdomain;
+       struct acpi_processor_throttling *pthrottling;
+
+       pthrottling = &pr->throttling;
+       pthrottling->tsd_valid_flag = 0;
 
        status = acpi_evaluate_object(pr->handle, "_TSD", NULL, &buffer);
        if (ACPI_FAILURE(status)) {
@@ -238,13 +603,13 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
 
        tsd = buffer.pointer;
        if (!tsd || (tsd->type != ACPI_TYPE_PACKAGE)) {
-               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
+               printk(KERN_ERR PREFIX "Invalid _TSD data\n");
                result = -EFAULT;
                goto end;
        }
 
        if (tsd->package.count != 1) {
-               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
+               printk(KERN_ERR PREFIX "Invalid _TSD data\n");
                result = -EFAULT;
                goto end;
        }
@@ -257,23 +622,39 @@ static int acpi_processor_get_tsd(struct acpi_processor *pr)
        status = acpi_extract_package(&(tsd->package.elements[0]),
                                      &format, &state);
        if (ACPI_FAILURE(status)) {
-               ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid _TSD data\n"));
+               printk(KERN_ERR PREFIX "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"));
+               printk(KERN_ERR PREFIX "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"));
+               printk(KERN_ERR PREFIX "Unknown _TSD:revision\n");
                result = -EFAULT;
                goto end;
        }
 
+       pthrottling = &pr->throttling;
+       pthrottling->tsd_valid_flag = 1;
+       pthrottling->shared_type = pdomain->coord_type;
+       cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
+       /*
+        * If the coordination type is not defined in ACPI spec,
+        * the tsd_valid_flag will be clear and coordination type
+        * will be forecd as DOMAIN_COORD_TYPE_SW_ALL.
+        */
+       if (pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ALL &&
+               pdomain->coord_type != DOMAIN_COORD_TYPE_SW_ANY &&
+               pdomain->coord_type != DOMAIN_COORD_TYPE_HW_ALL) {
+               pthrottling->tsd_valid_flag = 0;
+               pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
+       }
+
       end:
        kfree(buffer.pointer);
        return result;
@@ -328,44 +709,119 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
        return 0;
 }
 
-static int acpi_read_throttling_status(struct acpi_processor_throttling
-                                      *throttling)
+#ifdef CONFIG_X86
+static int acpi_throttling_rdmsr(u64 *value)
+{
+       u64 msr_high, msr_low;
+       u64 msr = 0;
+       int ret = -1;
+
+       if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
+               !this_cpu_has(X86_FEATURE_ACPI)) {
+               printk(KERN_ERR PREFIX
+                       "HARDWARE addr space,NOT supported yet\n");
+       } else {
+               msr_low = 0;
+               msr_high = 0;
+               rdmsr_safe(MSR_IA32_THERM_CONTROL,
+                       (u32 *)&msr_low , (u32 *) &msr_high);
+               msr = (msr_high << 32) | msr_low;
+               *value = (u64) msr;
+               ret = 0;
+       }
+       return ret;
+}
+
+static int acpi_throttling_wrmsr(u64 value)
+{
+       int ret = -1;
+       u64 msr;
+
+       if ((this_cpu_read(cpu_info.x86_vendor) != X86_VENDOR_INTEL) ||
+               !this_cpu_has(X86_FEATURE_ACPI)) {
+               printk(KERN_ERR PREFIX
+                       "HARDWARE addr space,NOT supported yet\n");
+       } else {
+               msr = value;
+               wrmsr_safe(MSR_IA32_THERM_CONTROL,
+                       msr & 0xffffffff, msr >> 32);
+               ret = 0;
+       }
+       return ret;
+}
+#else
+static int acpi_throttling_rdmsr(u64 *value)
+{
+       printk(KERN_ERR PREFIX
+               "HARDWARE addr space,NOT supported yet\n");
+       return -1;
+}
+
+static int acpi_throttling_wrmsr(u64 value)
+{
+       printk(KERN_ERR PREFIX
+               "HARDWARE addr space,NOT supported yet\n");
+       return -1;
+}
+#endif
+
+static int acpi_read_throttling_status(struct acpi_processor *pr,
+                                       u64 *value)
 {
-       int value = -1;
+       u32 bit_width, bit_offset;
+       u32 ptc_value;
+       u64 ptc_mask;
+       struct acpi_processor_throttling *throttling;
+       int ret = -1;
+
+       throttling = &pr->throttling;
        switch (throttling->status_register.space_id) {
        case ACPI_ADR_SPACE_SYSTEM_IO:
+               bit_width = throttling->status_register.bit_width;
+               bit_offset = throttling->status_register.bit_offset;
+
                acpi_os_read_port((acpi_io_address) throttling->status_register.
-                                 address, &value,
-                                 (u32) throttling->status_register.bit_width *
-                                 8);
+                                 address, &ptc_value,
+                                 (u32) (bit_width + bit_offset));
+               ptc_mask = (1 << bit_width) - 1;
+               *value = (u64) ((ptc_value >> bit_offset) & ptc_mask);
+               ret = 0;
                break;
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
-               printk(KERN_ERR PREFIX
-                      "HARDWARE addr space,NOT supported yet\n");
+               ret = acpi_throttling_rdmsr(value);
                break;
        default:
                printk(KERN_ERR PREFIX "Unknown addr space %d\n",
                       (u32) (throttling->status_register.space_id));
        }
-       return value;
+       return ret;
 }
 
-static int acpi_write_throttling_state(struct acpi_processor_throttling
-                                      *throttling, int value)
+static int acpi_write_throttling_state(struct acpi_processor *pr,
+                               u64 value)
 {
+       u32 bit_width, bit_offset;
+       u64 ptc_value;
+       u64 ptc_mask;
+       struct acpi_processor_throttling *throttling;
        int ret = -1;
 
+       throttling = &pr->throttling;
        switch (throttling->control_register.space_id) {
        case ACPI_ADR_SPACE_SYSTEM_IO:
+               bit_width = throttling->control_register.bit_width;
+               bit_offset = throttling->control_register.bit_offset;
+               ptc_mask = (1 << bit_width) - 1;
+               ptc_value = value & ptc_mask;
+
                acpi_os_write_port((acpi_io_address) throttling->
-                                  control_register.address, value,
-                                  (u32) throttling->control_register.
-                                  bit_width * 8);
+                                       control_register.address,
+                                       (u32) (ptc_value << bit_offset),
+                                       (u32) (bit_width + bit_offset));
                ret = 0;
                break;
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
-               printk(KERN_ERR PREFIX
-                      "HARDWARE addr space,NOT supported yet\n");
+               ret = acpi_throttling_wrmsr(value);
                break;
        default:
                printk(KERN_ERR PREFIX "Unknown addr space %d\n",
@@ -374,7 +830,8 @@ static int acpi_write_throttling_state(struct acpi_processor_throttling
        return ret;
 }
 
-static int acpi_get_throttling_state(struct acpi_processor *pr, int value)
+static int acpi_get_throttling_state(struct acpi_processor *pr,
+                               u64 value)
 {
        int i;
 
@@ -383,29 +840,31 @@ static int acpi_get_throttling_state(struct acpi_processor *pr, int value)
                    (struct acpi_processor_tx_tss *)&(pr->throttling.
                                                      states_tss[i]);
                if (tx->control == value)
-                       break;
+                       return i;
        }
-       if (i > pr->throttling.state_count)
-               i = -1;
-       return i;
+       return -1;
 }
 
-static int acpi_get_throttling_value(struct acpi_processor *pr, int state)
+static int acpi_get_throttling_value(struct acpi_processor *pr,
+                       int state, u64 *value)
 {
-       int value = -1;
+       int ret = -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;
+               *value = tx->control;
+               ret = 0;
        }
-       return value;
+       return ret;
 }
 
 static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
 {
        int state = 0;
-       u32 value = 0;
+       int ret;
+       u64 value;
 
        if (!pr)
                return -EINVAL;
@@ -414,24 +873,93 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
                return -ENODEV;
 
        pr->throttling.state = 0;
-       local_irq_disable();
-       value = acpi_read_throttling_status(&pr->throttling);
-       if (value >= 0) {
+
+       value = 0;
+       ret = acpi_read_throttling_status(pr, &value);
+       if (ret >= 0) {
                state = acpi_get_throttling_state(pr, value);
+               if (state == -1) {
+                       ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                               "Invalid throttling state, reset\n"));
+                       state = 0;
+                       ret = acpi_processor_set_throttling(pr, state, true);
+                       if (ret)
+                               return ret;
+               }
                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);
+       cpumask_var_t saved_mask;
+       int ret;
+
+       if (!pr)
+               return -EINVAL;
+
+       if (!pr->flags.throttling)
+               return -ENODEV;
+
+       if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
+               return -ENOMEM;
+
+       /*
+        * Migrate task to the cpu pointed by pr.
+        */
+       cpumask_copy(saved_mask, &current->cpus_allowed);
+       /* FIXME: use work_on_cpu() */
+       if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) {
+               /* Can't migrate to the target pr->id CPU. Exit */
+               free_cpumask_var(saved_mask);
+               return -ENODEV;
+       }
+       ret = pr->throttling.acpi_processor_get_throttling(pr);
+       /* restore the previous state */
+       set_cpus_allowed_ptr(current, saved_mask);
+       free_cpumask_var(saved_mask);
+
+       return ret;
+}
+
+static int acpi_processor_get_fadt_info(struct acpi_processor *pr)
+{
+       int i, step;
+
+       if (!pr->throttling.address) {
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
+               return -EINVAL;
+       } else if (!pr->throttling.duty_width) {
+               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
+               return -EINVAL;
+       }
+       /* TBD: Support duty_cycle values that span bit 4. */
+       else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
+               printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
+               return -EINVAL;
+       }
+
+       pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
+
+       /*
+        * Compute state values. Note that throttling displays a linear power
+        * performance relationship (at 50% performance the CPU will consume
+        * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
+        */
+
+       step = (1000 / pr->throttling.state_count);
+
+       for (i = 0; i < pr->throttling.state_count; i++) {
+               pr->throttling.states[i].performance = 1000 - step * i;
+               pr->throttling.states[i].power = 1000 - step * i;
+       }
+       return 0;
 }
 
 static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
-                                             int state)
+                                             int state, bool force)
 {
        u32 value = 0;
        u32 duty_mask = 0;
@@ -446,7 +974,7 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
        if (!pr->flags.throttling)
                return -ENODEV;
 
-       if (state == pr->throttling.state)
+       if (!force && (state == pr->throttling.state))
                return 0;
 
        if (state < pr->throttling_platform_limit)
@@ -504,9 +1032,10 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
 }
 
 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
-                                            int state)
+                                            int state, bool force)
 {
-       u32 value = 0;
+       int ret;
+       u64 value;
 
        if (!pr)
                return -EINVAL;
@@ -517,34 +1046,148 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
        if (!pr->flags.throttling)
                return -ENODEV;
 
-       if (state == pr->throttling.state)
+       if (!force && (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);
+       value = 0;
+       ret = acpi_get_throttling_value(pr, state, &value);
+       if (ret >= 0) {
+               acpi_write_throttling_state(pr, value);
                pr->throttling.state = state;
        }
-       local_irq_enable();
 
        return 0;
 }
 
-int acpi_processor_set_throttling(struct acpi_processor *pr, int state)
+int acpi_processor_set_throttling(struct acpi_processor *pr,
+                                               int state, bool force)
 {
-       return pr->throttling.acpi_processor_set_throttling(pr, state);
+       cpumask_var_t saved_mask;
+       int ret = 0;
+       unsigned int i;
+       struct acpi_processor *match_pr;
+       struct acpi_processor_throttling *p_throttling;
+       struct throttling_tstate t_state;
+       cpumask_var_t online_throttling_cpus;
+
+       if (!pr)
+               return -EINVAL;
+
+       if (!pr->flags.throttling)
+               return -ENODEV;
+
+       if ((state < 0) || (state > (pr->throttling.state_count - 1)))
+               return -EINVAL;
+
+       if (!alloc_cpumask_var(&saved_mask, GFP_KERNEL))
+               return -ENOMEM;
+
+       if (!alloc_cpumask_var(&online_throttling_cpus, GFP_KERNEL)) {
+               free_cpumask_var(saved_mask);
+               return -ENOMEM;
+       }
+
+       if (cpu_is_offline(pr->id)) {
+               /*
+                * the cpu pointed by pr->id is offline. Unnecessary to change
+                * the throttling state any more.
+                */
+               return -ENODEV;
+       }
+
+       cpumask_copy(saved_mask, &current->cpus_allowed);
+       t_state.target_state = state;
+       p_throttling = &(pr->throttling);
+       cpumask_and(online_throttling_cpus, cpu_online_mask,
+                   p_throttling->shared_cpu_map);
+       /*
+        * The throttling notifier will be called for every
+        * affected cpu in order to get one proper T-state.
+        * The notifier event is THROTTLING_PRECHANGE.
+        */
+       for_each_cpu(i, online_throttling_cpus) {
+               t_state.cpu = i;
+               acpi_processor_throttling_notifier(THROTTLING_PRECHANGE,
+                                                       &t_state);
+       }
+       /*
+        * The function of acpi_processor_set_throttling will be called
+        * to switch T-state. If the coordination type is SW_ALL or HW_ALL,
+        * it is necessary to call it for every affected cpu. Otherwise
+        * it can be called only for the cpu pointed by pr.
+        */
+       if (p_throttling->shared_type == DOMAIN_COORD_TYPE_SW_ANY) {
+               /* FIXME: use work_on_cpu() */
+               if (set_cpus_allowed_ptr(current, cpumask_of(pr->id))) {
+                       /* Can't migrate to the pr->id CPU. Exit */
+                       ret = -ENODEV;
+                       goto exit;
+               }
+               ret = p_throttling->acpi_processor_set_throttling(pr,
+                                               t_state.target_state, force);
+       } else {
+               /*
+                * When the T-state coordination is SW_ALL or HW_ALL,
+                * it is necessary to set T-state for every affected
+                * cpus.
+                */
+               for_each_cpu(i, online_throttling_cpus) {
+                       match_pr = per_cpu(processors, i);
+                       /*
+                        * If the pointer is invalid, we will report the
+                        * error message and continue.
+                        */
+                       if (!match_pr) {
+                               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "Invalid Pointer for CPU %d\n", i));
+                               continue;
+                       }
+                       /*
+                        * If the throttling control is unsupported on CPU i,
+                        * we will report the error message and continue.
+                        */
+                       if (!match_pr->flags.throttling) {
+                               ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+                                       "Throttling Control is unsupported "
+                                       "on CPU %d\n", i));
+                               continue;
+                       }
+                       t_state.cpu = i;
+                       /* FIXME: use work_on_cpu() */
+                       if (set_cpus_allowed_ptr(current, cpumask_of(i)))
+                               continue;
+                       ret = match_pr->throttling.
+                               acpi_processor_set_throttling(
+                               match_pr, t_state.target_state, force);
+               }
+       }
+       /*
+        * After the set_throttling is called, the
+        * throttling notifier is called for every
+        * affected cpu to update the T-states.
+        * The notifier event is THROTTLING_POSTCHANGE
+        */
+       for_each_cpu(i, online_throttling_cpus) {
+               t_state.cpu = i;
+               acpi_processor_throttling_notifier(THROTTLING_POSTCHANGE,
+                                                       &t_state);
+       }
+       /* restore the previous state */
+       /* FIXME: use work_on_cpu() */
+       set_cpus_allowed_ptr(current, saved_mask);
+exit:
+       free_cpumask_var(online_throttling_cpus);
+       free_cpumask_var(saved_mask);
+       return ret;
 }
 
 int acpi_processor_get_throttling_info(struct acpi_processor *pr)
 {
        int result = 0;
-       int step = 0;
-       int i = 0;
+       struct acpi_processor_throttling *pthrottling;
 
        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                          "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
@@ -552,9 +1195,6 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                          pr->throttling.duty_offset,
                          pr->throttling.duty_width));
 
-       if (!pr)
-               return -EINVAL;
-
        /*
         * Evaluate _PTC, _TSS and _TPC
         * They must all be present or none of them can be used.
@@ -567,6 +1207,8 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                    &acpi_processor_get_throttling_fadt;
                pr->throttling.acpi_processor_set_throttling =
                    &acpi_processor_set_throttling_fadt;
+               if (acpi_processor_get_fadt_info(pr))
+                       return 0;
        } else {
                pr->throttling.acpi_processor_get_throttling =
                    &acpi_processor_get_throttling_ptc;
@@ -574,19 +1216,15 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                    &acpi_processor_set_throttling_ptc;
        }
 
-       acpi_processor_get_tsd(pr);
-
-       if (!pr->throttling.address) {
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling register\n"));
-               return 0;
-       } else if (!pr->throttling.duty_width) {
-               ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No throttling states\n"));
-               return 0;
-       }
-       /* TBD: Support duty_cycle values that span bit 4. */
-       else if ((pr->throttling.duty_offset + pr->throttling.duty_width) > 4) {
-               printk(KERN_WARNING PREFIX "duty_cycle spans bit 4\n");
-               return 0;
+       /*
+        * If TSD package for one CPU can't be parsed successfully, it means
+        * that this CPU will have no coordination with other CPUs.
+        */
+       if (acpi_processor_get_tsd(pr)) {
+               pthrottling = &pr->throttling;
+               pthrottling->tsd_valid_flag = 0;
+               cpumask_set_cpu(pr->id, pthrottling->shared_cpu_map);
+               pthrottling->shared_type = DOMAIN_COORD_TYPE_SW_ALL;
        }
 
        /*
@@ -600,21 +1238,6 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                return 0;
        }
 
-       pr->throttling.state_count = 1 << acpi_gbl_FADT.duty_width;
-
-       /*
-        * Compute state values. Note that throttling displays a linear power/
-        * performance relationship (at 50% performance the CPU will consume
-        * 50% power).  Values are in 1/10th of a percent to preserve accuracy.
-        */
-
-       step = (1000 / pr->throttling.state_count);
-
-       for (i = 0; i < pr->throttling.state_count; i++) {
-               pr->throttling.states[i].performance = step * i;
-               pr->throttling.states[i].power = step * i;
-       }
-
        ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d throttling states\n",
                          pr->throttling.state_count));
 
@@ -634,7 +1257,7 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
                ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                  "Disabling throttling (was T%d)\n",
                                  pr->throttling.state));
-               result = acpi_processor_set_throttling(pr, 0);
+               result = acpi_processor_set_throttling(pr, 0, false);
                if (result)
                        goto end;
        }
@@ -646,95 +1269,3 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
        return result;
 }
 
-/* proc interface */
-
-static int acpi_processor_throttling_seq_show(struct seq_file *seq,
-                                             void *offset)
-{
-       struct acpi_processor *pr = seq->private;
-       int i = 0;
-       int result = 0;
-
-       if (!pr)
-               goto end;
-
-       if (!(pr->throttling.state_count > 0)) {
-               seq_puts(seq, "<not supported>\n");
-               goto end;
-       }
-
-       result = acpi_processor_get_throttling(pr);
-
-       if (result) {
-               seq_puts(seq,
-                        "Could not determine current throttling state.\n");
-               goto end;
-       }
-
-       seq_printf(seq, "state count:             %d\n"
-                  "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");
-       if (pr->throttling.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;
-}
-
-static int acpi_processor_throttling_open_fs(struct inode *inode,
-                                            struct file *file)
-{
-       return single_open(file, acpi_processor_throttling_seq_show,
-                          PDE(inode)->data);
-}
-
-static ssize_t acpi_processor_write_throttling(struct file *file,
-                                              const char __user * buffer,
-                                              size_t count, loff_t * data)
-{
-       int result = 0;
-       struct seq_file *m = file->private_data;
-       struct acpi_processor *pr = m->private;
-       char state_string[12] = { '\0' };
-
-       if (!pr || (count > sizeof(state_string) - 1))
-               return -EINVAL;
-
-       if (copy_from_user(state_string, buffer, count))
-               return -EFAULT;
-
-       state_string[count] = '\0';
-
-       result = acpi_processor_set_throttling(pr,
-                                              simple_strtoul(state_string,
-                                                             NULL, 0));
-       if (result)
-               return result;
-
-       return count;
-}
-
-struct file_operations acpi_processor_throttling_fops = {
-       .open = acpi_processor_throttling_open_fs,
-       .read = seq_read,
-       .write = acpi_processor_write_throttling,
-       .llseek = seq_lseek,
-       .release = single_release,
-};