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Add the new CPUFREQ_FLAG_INFO_ONLY flag for drivers which can attach to

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read info about the possible settings for a CPU but cannot control them
directly.
This commit is contained in:
Nate Lawson 2005-02-13 05:37:19 +00:00
parent 3bd74b84f5
commit 5fffaf1615
1 changed files with 10 additions and 1 deletions
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11
sys/sys/cpu.h
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@ -48,7 +48,7 @@ static __inline struct pcpu *cpu_get_pcpu(device_t dev)
/* Each driver's CPU frequency setting is exported in this format. */
struct cf_setting {
int freq; /* Processor clock in Mhz or percent (in 100ths.) */
int freq; /* CPU clock in Mhz or 100ths of a percent. */
int volts; /* Voltage in mV. */
int power; /* Power consumed in mW. */
int lat; /* Transition latency in us. */
@ -82,9 +82,18 @@ TAILQ_HEAD(cf_level_lst, cf_level);
* frequency settings of 100, 200 and 300, 400 and a relative driver that
* provides settings of 50%, 100%. The cpufreq core would export frequency
* levels of 50, 100, 150, 200, 300, 400.
*
* The "info only" flag signifies that settings returned by
* CPUFREQ_DRV_SETTINGS cannot be passed to the CPUFREQ_DRV_SET method and
* are only informational. This is for some drivers that can return
* information about settings but rely on another machine-dependent driver
* for actually performing the frequency transition (e.g., ACPI performance
* states of type "functional fixed hardware.")
*/
#define CPUFREQ_TYPE_MASK 0xffff
#define CPUFREQ_TYPE_RELATIVE (1<<0)
#define CPUFREQ_TYPE_ABSOLUTE (1<<1)
#define CPUFREQ_FLAG_INFO_ONLY (1<<16)
/*
* When setting a level, the caller indicates the priority of this request.