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239708a3af
The ACPI processor driver is currently tied too closely to the ACPI P-states (PSS) and other related constructs for controlling CPU performance. The newer ACPI specification (v5.1 onwards) introduces alternative methods to PSS. These new mechanisms are described within each ACPI Processor object and so they need to be scanned whenever a new Processor object is detected. This patch introduces a new Kconfig symbol to allow for finer configurability among the two options for controlling performance states. There is no change in functionality and the option is auto-selected by the architectures which support it. A future commit will introduce support for CPPC: A newer method of controlling CPU performance. The OS is not expected to support CPPC and PSS at the same time, so the Kconfig option lets us make the two mutually exclusive at compile time. Signed-off-by: Ashwin Chaugule <ashwin.chaugule@linaro.org> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
390 lines
9.8 KiB
C
390 lines
9.8 KiB
C
#ifndef __ACPI_PROCESSOR_H
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#define __ACPI_PROCESSOR_H
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#include <linux/kernel.h>
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#include <linux/cpu.h>
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#include <linux/thermal.h>
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#include <asm/acpi.h>
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#define ACPI_PROCESSOR_CLASS "processor"
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#define ACPI_PROCESSOR_DEVICE_NAME "Processor"
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#define ACPI_PROCESSOR_DEVICE_HID "ACPI0007"
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#define ACPI_PROCESSOR_BUSY_METRIC 10
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#define ACPI_PROCESSOR_MAX_POWER 8
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#define ACPI_PROCESSOR_MAX_C2_LATENCY 100
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#define ACPI_PROCESSOR_MAX_C3_LATENCY 1000
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#define ACPI_PROCESSOR_MAX_THROTTLING 16
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#define ACPI_PROCESSOR_MAX_THROTTLE 250 /* 25% */
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#define ACPI_PROCESSOR_MAX_DUTY_WIDTH 4
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#define ACPI_PDC_REVISION_ID 0x1
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#define ACPI_PSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
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#define ACPI_PSD_REV0_ENTRIES 5
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#define ACPI_TSD_REV0_REVISION 0 /* Support for _PSD as in ACPI 3.0 */
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#define ACPI_TSD_REV0_ENTRIES 5
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/*
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* Types of coordination defined in ACPI 3.0. Same macros can be used across
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* P, C and T states
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*/
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#define DOMAIN_COORD_TYPE_SW_ALL 0xfc
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#define DOMAIN_COORD_TYPE_SW_ANY 0xfd
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#define DOMAIN_COORD_TYPE_HW_ALL 0xfe
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#define ACPI_CSTATE_SYSTEMIO 0
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#define ACPI_CSTATE_FFH 1
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#define ACPI_CSTATE_HALT 2
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#define ACPI_CX_DESC_LEN 32
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/* Power Management */
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struct acpi_processor_cx;
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struct acpi_power_register {
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u8 descriptor;
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u16 length;
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u8 space_id;
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u8 bit_width;
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u8 bit_offset;
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u8 access_size;
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u64 address;
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} __packed;
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struct acpi_processor_cx {
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u8 valid;
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u8 type;
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u32 address;
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u8 entry_method;
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u8 index;
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u32 latency;
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u8 bm_sts_skip;
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char desc[ACPI_CX_DESC_LEN];
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};
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struct acpi_processor_power {
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int count;
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struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
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int timer_broadcast_on_state;
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};
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/* Performance Management */
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struct acpi_psd_package {
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u64 num_entries;
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u64 revision;
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u64 domain;
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u64 coord_type;
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u64 num_processors;
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} __packed;
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struct acpi_pct_register {
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u8 descriptor;
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u16 length;
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u8 space_id;
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u8 bit_width;
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u8 bit_offset;
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u8 reserved;
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u64 address;
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} __packed;
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struct acpi_processor_px {
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u64 core_frequency; /* megahertz */
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u64 power; /* milliWatts */
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u64 transition_latency; /* microseconds */
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u64 bus_master_latency; /* microseconds */
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u64 control; /* control value */
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u64 status; /* success indicator */
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};
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struct acpi_processor_performance {
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unsigned int state;
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unsigned int platform_limit;
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struct acpi_pct_register control_register;
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struct acpi_pct_register status_register;
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unsigned int state_count;
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struct acpi_processor_px *states;
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struct acpi_psd_package domain_info;
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cpumask_var_t shared_cpu_map;
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unsigned int shared_type;
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};
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/* Throttling Control */
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struct acpi_tsd_package {
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u64 num_entries;
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u64 revision;
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u64 domain;
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u64 coord_type;
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u64 num_processors;
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} __packed;
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struct acpi_ptc_register {
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u8 descriptor;
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u16 length;
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u8 space_id;
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u8 bit_width;
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u8 bit_offset;
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u8 reserved;
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u64 address;
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} __packed;
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struct acpi_processor_tx_tss {
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u64 freqpercentage; /* */
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u64 power; /* milliWatts */
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u64 transition_latency; /* microseconds */
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u64 control; /* control value */
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u64 status; /* success indicator */
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};
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struct acpi_processor_tx {
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u16 power;
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u16 performance;
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};
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struct acpi_processor;
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struct acpi_processor_throttling {
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unsigned int state;
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unsigned int platform_limit;
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struct acpi_pct_register control_register;
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struct acpi_pct_register status_register;
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unsigned int state_count;
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struct acpi_processor_tx_tss *states_tss;
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struct acpi_tsd_package domain_info;
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cpumask_var_t shared_cpu_map;
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int (*acpi_processor_get_throttling) (struct acpi_processor * pr);
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int (*acpi_processor_set_throttling) (struct acpi_processor * pr,
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int state, bool force);
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u32 address;
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u8 duty_offset;
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u8 duty_width;
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u8 tsd_valid_flag;
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unsigned int shared_type;
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struct acpi_processor_tx states[ACPI_PROCESSOR_MAX_THROTTLING];
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};
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/* Limit Interface */
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struct acpi_processor_lx {
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int px; /* performance state */
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int tx; /* throttle level */
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};
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struct acpi_processor_limit {
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struct acpi_processor_lx state; /* current limit */
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struct acpi_processor_lx thermal; /* thermal limit */
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struct acpi_processor_lx user; /* user limit */
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};
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struct acpi_processor_flags {
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u8 power:1;
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u8 performance:1;
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u8 throttling:1;
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u8 limit:1;
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u8 bm_control:1;
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u8 bm_check:1;
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u8 has_cst:1;
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u8 power_setup_done:1;
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u8 bm_rld_set:1;
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u8 need_hotplug_init:1;
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};
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struct acpi_processor {
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acpi_handle handle;
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u32 acpi_id;
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phys_cpuid_t phys_id; /* CPU hardware ID such as APIC ID for x86 */
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u32 id; /* CPU logical ID allocated by OS */
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u32 pblk;
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int performance_platform_limit;
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int throttling_platform_limit;
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/* 0 - states 0..n-th state available */
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struct acpi_processor_flags flags;
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struct acpi_processor_power power;
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struct acpi_processor_performance *performance;
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struct acpi_processor_throttling throttling;
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struct acpi_processor_limit limit;
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struct thermal_cooling_device *cdev;
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struct device *dev; /* Processor device. */
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};
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struct acpi_processor_errata {
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u8 smp;
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struct {
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u8 throttle:1;
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u8 fdma:1;
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u8 reserved:6;
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u32 bmisx;
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} piix4;
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};
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extern int acpi_processor_preregister_performance(struct
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acpi_processor_performance
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__percpu *performance);
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extern int acpi_processor_register_performance(struct acpi_processor_performance
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*performance, unsigned int cpu);
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extern void acpi_processor_unregister_performance(struct
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acpi_processor_performance
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*performance,
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unsigned int cpu);
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/* note: this locks both the calling module and the processor module
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if a _PPC object exists, rmmod is disallowed then */
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int acpi_processor_notify_smm(struct module *calling_module);
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/* parsing the _P* objects. */
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extern int acpi_processor_get_performance_info(struct acpi_processor *pr);
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/* for communication between multiple parts of the processor kernel module */
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DECLARE_PER_CPU(struct acpi_processor *, processors);
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extern struct acpi_processor_errata errata;
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#ifdef ARCH_HAS_POWER_INIT
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void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
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unsigned int cpu);
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int acpi_processor_ffh_cstate_probe(unsigned int cpu,
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struct acpi_processor_cx *cx,
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struct acpi_power_register *reg);
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void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx *cstate);
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#else
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static inline void acpi_processor_power_init_bm_check(struct
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acpi_processor_flags
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*flags, unsigned int cpu)
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{
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flags->bm_check = 1;
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return;
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}
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static inline int acpi_processor_ffh_cstate_probe(unsigned int cpu,
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struct acpi_processor_cx *cx,
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struct acpi_power_register
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*reg)
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{
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return -1;
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}
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static inline void acpi_processor_ffh_cstate_enter(struct acpi_processor_cx
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*cstate)
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{
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return;
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}
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#endif
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/* in processor_perflib.c */
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#ifdef CONFIG_CPU_FREQ
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void acpi_processor_ppc_init(void);
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void acpi_processor_ppc_exit(void);
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int acpi_processor_ppc_has_changed(struct acpi_processor *pr, int event_flag);
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extern int acpi_processor_get_bios_limit(int cpu, unsigned int *limit);
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#else
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static inline void acpi_processor_ppc_init(void)
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{
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return;
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}
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static inline void acpi_processor_ppc_exit(void)
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{
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return;
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}
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static inline int acpi_processor_ppc_has_changed(struct acpi_processor *pr,
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int event_flag)
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{
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static unsigned int printout = 1;
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if (printout) {
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printk(KERN_WARNING
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"Warning: Processor Platform Limit event detected, but not handled.\n");
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printk(KERN_WARNING
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"Consider compiling CPUfreq support into your kernel.\n");
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printout = 0;
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}
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return 0;
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}
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static inline int acpi_processor_get_bios_limit(int cpu, unsigned int *limit)
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{
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return -ENODEV;
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}
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#endif /* CONFIG_CPU_FREQ */
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/* in processor_core.c */
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phys_cpuid_t acpi_get_phys_id(acpi_handle, int type, u32 acpi_id);
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int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id);
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int acpi_get_cpuid(acpi_handle, int type, u32 acpi_id);
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/* in processor_pdc.c */
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void acpi_processor_set_pdc(acpi_handle handle);
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/* in processor_throttling.c */
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#ifdef CONFIG_ACPI_CPU_FREQ_PSS
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int acpi_processor_tstate_has_changed(struct acpi_processor *pr);
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int acpi_processor_get_throttling_info(struct acpi_processor *pr);
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extern int acpi_processor_set_throttling(struct acpi_processor *pr,
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int state, bool force);
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/*
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* Reevaluate whether the T-state is invalid after one cpu is
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* onlined/offlined. In such case the flags.throttling will be updated.
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*/
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extern void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
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unsigned long action);
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extern const struct file_operations acpi_processor_throttling_fops;
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extern void acpi_processor_throttling_init(void);
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#else
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static inline int acpi_processor_tstate_has_changed(struct acpi_processor *pr)
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{
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return 0;
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}
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static inline int acpi_processor_get_throttling_info(struct acpi_processor *pr)
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{
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return -ENODEV;
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}
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static inline int acpi_processor_set_throttling(struct acpi_processor *pr,
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int state, bool force)
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{
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return -ENODEV;
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}
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static inline void acpi_processor_reevaluate_tstate(struct acpi_processor *pr,
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unsigned long action) {}
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static inline void acpi_processor_throttling_init(void) {}
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#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
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/* in processor_idle.c */
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int acpi_processor_power_init(struct acpi_processor *pr);
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int acpi_processor_power_exit(struct acpi_processor *pr);
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int acpi_processor_cst_has_changed(struct acpi_processor *pr);
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int acpi_processor_hotplug(struct acpi_processor *pr);
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extern struct cpuidle_driver acpi_idle_driver;
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#ifdef CONFIG_PM_SLEEP
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void acpi_processor_syscore_init(void);
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void acpi_processor_syscore_exit(void);
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#else
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static inline void acpi_processor_syscore_init(void) {}
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static inline void acpi_processor_syscore_exit(void) {}
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#endif
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/* in processor_thermal.c */
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int acpi_processor_get_limit_info(struct acpi_processor *pr);
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extern const struct thermal_cooling_device_ops processor_cooling_ops;
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#if defined(CONFIG_ACPI_CPU_FREQ_PSS) & defined(CONFIG_CPU_FREQ)
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void acpi_thermal_cpufreq_init(void);
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void acpi_thermal_cpufreq_exit(void);
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#else
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static inline void acpi_thermal_cpufreq_init(void)
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{
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return;
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}
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static inline void acpi_thermal_cpufreq_exit(void)
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{
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return;
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}
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#endif /* CONFIG_ACPI_CPU_FREQ_PSS */
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#endif
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