diff options
Diffstat (limited to 'drivers/acpi/processor_throttling.c')
| -rw-r--r-- | drivers/acpi/processor_throttling.c | 380 |
1 files changed, 374 insertions, 6 deletions
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c index b33486009f4..1bae2e42a7c 100644 --- a/drivers/acpi/processor_throttling.c +++ b/drivers/acpi/processor_throttling.c @@ -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; |