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kernel: Add support and interface for cpufreq modules

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This commit is contained in:
Pawel Dziepak 2013-10-30 00:48:07 +01:00
parent 6d96f462dc
commit 22d8248267
3 changed files with 83 additions and 1 deletions
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26
headers/os/drivers/cpufreq.h Normal file
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@ -0,0 +1,26 @@
/*
* Copyright 2013, Haiku, Inc. All Rights Reserved.
* Distributed under the terms of the MIT License.
*/
#ifndef _CPUFREQ_H
#define _CPUFREQ_H
#include <module.h>
#define CPUFREQ_MODULES_PREFIX "power/cpufreq"
const int kCPUPerformanceScaleMax = 1000;
typedef struct cpufreq_module_info {
module_info info;
status_t (*increase_performance)(int delta, bool allowBoost);
status_t (*decrease_performance)(int delta);
} cpufreq_module_info;
#endif // _CPUFREQ_H

3
headers/private/kernel/cpu.h
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@ -104,6 +104,9 @@ extern inline cpu_ent *get_cpu_struct(void) { return &gCPU[smp_get_current_cpu()
status_t cpu_build_topology_tree(void);
cpu_topology_node* get_cpu_topology(void);
status_t increase_cpu_performance(int delta, bool allowBoost);
status_t decrease_cpu_performance(int delta);
void _user_clear_caches(void *address, size_t length, uint32 flags);
bool _user_cpu_enabled(int32 cpu);
status_t _user_set_cpu_enabled(int32 cpu, bool enabled);

55
src/system/kernel/cpu.cpp
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@ -1,4 +1,5 @@
/*
* Copyright 2013, Paweł Dziepak, pdziepak@quarnos.org.
* Copyright 2002-2008, Axel Dörfler, axeld@pinc-software.de.
* Distributed under the terms of the MIT License.
*
@ -14,6 +15,8 @@
#include <string.h>
#include <cpufreq.h>
#include <boot/kernel_args.h>
#include <thread_types.h>
#include <util/AutoLock.h>
@ -25,6 +28,8 @@ cpu_ent gCPU[MAX_BOOT_CPUS];
uint32 gCPUCacheLevelCount;
static cpu_topology_node sCPUTopology;
static cpufreq_module_info* sCPUPerformanceModule;
static spinlock sSetCpuLock;
@ -49,10 +54,40 @@ cpu_init_post_vm(kernel_args *args)
}
static void
load_cpufreq_module()
{
void* cookie = open_module_list(CPUFREQ_MODULES_PREFIX);
while (true) {
char name[B_FILE_NAME_LENGTH];
size_t nameLength = sizeof(name);
if (read_next_module_name(cookie, name, &nameLength) != B_OK)
break;
if (get_module(name, (module_info**)&sCPUPerformanceModule) == B_OK) {
dprintf("found cpufreq module: %s\n", name);
break;
}
}
close_module_list(cookie);
if (sCPUPerformanceModule == NULL)
dprintf("no valid cpufreq module found\n");
}
status_t
cpu_init_post_modules(kernel_args *args)
{
return arch_cpu_init_post_modules(args);
status_t result = arch_cpu_init_post_modules(args);
if (result != B_OK)
return result;
load_cpufreq_module();
return B_OK;
}
@ -194,6 +229,24 @@ get_cpu_topology(void)
}
status_t
increase_cpu_performance(int delta, bool allowBoost)
{
if (sCPUPerformanceModule != NULL)
return sCPUPerformanceModule->increase_performance(delta, allowBoost);
return B_NOT_SUPPORTED;
}
status_t
decrease_cpu_performance(int delta)
{
if (sCPUPerformanceModule != NULL)
return sCPUPerformanceModule->decrease_performance(delta);
return B_NOT_SUPPORTED;
}
// #pragma mark -