X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=drivers%2Facpi%2Fprocessor_throttling.c;h=1685b40abda7c2dba944939917a4993f8a4a5f3d;hb=444ad82bc3eaa554be40d22dc248e58aeefd54d9;hp=0b8204e7082a366232b3d29121926ff0892f57cd;hpb=d941cf5e373c356723fa648b9f0302a11c9b1770;p=linux-2.6 diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c index 0b8204e708..1685b40abd 100644 --- a/drivers/acpi/processor_throttling.c +++ b/drivers/acpi/processor_throttling.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -70,7 +71,55 @@ static int acpi_processor_get_platform_limit(struct acpi_processor *pr) 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; + + 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); } /* @@ -83,6 +132,7 @@ 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 +184,22 @@ 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); @@ -328,44 +394,132 @@ 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(struct acpi_processor *pr, + acpi_integer * value) +{ + struct cpuinfo_x86 *c; + u64 msr_high, msr_low; + unsigned int cpu; + u64 msr = 0; + int ret = -1; + + cpu = pr->id; + c = &cpu_data(cpu); + + if ((c->x86_vendor != X86_VENDOR_INTEL) || + !cpu_has(c, 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 = (acpi_integer) msr; + ret = 0; + } + return ret; +} + +static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer value) { - int value = -1; + struct cpuinfo_x86 *c; + unsigned int cpu; + int ret = -1; + u64 msr; + + cpu = pr->id; + c = &cpu_data(cpu); + + if ((c->x86_vendor != X86_VENDOR_INTEL) || + !cpu_has(c, 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(struct acpi_processor *pr, + acpi_integer * value) +{ + printk(KERN_ERR PREFIX + "HARDWARE addr space,NOT supported yet\n"); + return -1; +} + +static int acpi_throttling_wrmsr(struct acpi_processor *pr, acpi_integer 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, + acpi_integer *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->status_register.space_id) { case ACPI_ADR_SPACE_SYSTEM_IO: + ptc_value = 0; + 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, (u32 *) &ptc_value, + (u32) (bit_width + bit_offset)); + ptc_mask = (1 << bit_width) - 1; + *value = (acpi_integer) ((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(pr, 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, + acpi_integer 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(pr, value); break; default: printk(KERN_ERR PREFIX "Unknown addr space %d\n", @@ -374,7 +528,8 @@ 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, + acpi_integer value) { int i; @@ -390,22 +545,26 @@ static int acpi_get_throttling_state(struct acpi_processor *pr, int value) return i; } -static int acpi_get_throttling_value(struct acpi_processor *pr, int state) +static int acpi_get_throttling_value(struct acpi_processor *pr, + int state, acpi_integer *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; + acpi_integer value; if (!pr) return -EINVAL; @@ -414,20 +573,66 @@ 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); 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_t saved_mask; + int ret; + + /* + * Migrate task to the cpu pointed by pr. + */ + saved_mask = current->cpus_allowed; + set_cpus_allowed(current, cpumask_of_cpu(pr->id)); + ret = pr->throttling.acpi_processor_get_throttling(pr); + /* restore the previous state */ + set_cpus_allowed(current, 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, @@ -506,7 +711,8 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr, static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, int state) { - u32 value = 0; + int ret; + acpi_integer value; if (!pr) return -EINVAL; @@ -523,28 +729,34 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr, 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) { - return pr->throttling.acpi_processor_set_throttling(pr, state); + cpumask_t saved_mask; + int ret; + /* + * Migrate task to the cpu pointed by pr. + */ + saved_mask = current->cpus_allowed; + set_cpus_allowed(current, cpumask_of_cpu(pr->id)); + ret = pr->throttling.acpi_processor_set_throttling(pr, state); + /* restore the previous state */ + set_cpus_allowed(current, saved_mask); + return ret; } int acpi_processor_get_throttling_info(struct acpi_processor *pr) { int result = 0; - int step = 0; - int i = 0; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n", @@ -567,6 +779,8 @@ 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; @@ -576,19 +790,6 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr) 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; - } - /* * PIIX4 Errata: We don't support throttling on the original PIIX4. * This shouldn't be an issue as few (if any) mobile systems ever @@ -600,21 +801,6 @@ 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));