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/*
* test module to dump contents of the ACPI tables relevant for
* CPU frequency scaling support. Kernel 2.6.3 or later required.
*
* Partly based on a patch for ACPI-PentiumM-cpufreq interaction by David
* Moore, sent to the cpufreq list in June 2003, and on various stuff to
* be found in drivers/acpi/processor.c and include/acpi/processor.h,
* (C) 2001, 2002 Andy Grover <andrew.grover@intel.com> and
* (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* (C) 2003 - 2004 Dominik Brodowski
*
* To use:
* 1.) ACPI_PROCESSOR must (at least) be built as a module, and
* CONFIG_CPU_FREQ must be defined in the kernel sources. Do not load
* any cpufreq driver, though.
*
* 2.) load this module
*
* 3.) if applicable: load this module with the "pdc=" parameters
* to tell the BIOS of the cpufreq capabilities of the Operating
* System.
*
* 4.) run dmesg to find the output
*
*/
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <asm/io.h>
#include <asm/delay.h>
#include <asm/uaccess.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
struct acpi_processor_performance p;
#define ACPI_PDC_REVISION_ID 0x1
static int pdc = 0;
static int __init
acpi_pdump_init (void)
{
unsigned int i;
struct acpi_pct_register *r;
union acpi_object arg0 = {ACPI_TYPE_BUFFER};
u32 arg0_buf[3];
struct acpi_object_list arg_list = {1, &arg0};
if (pdc) {
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
arg0_buf[0] = ACPI_PDC_REVISION_ID;
arg0_buf[1] = 1; /* One capability bit */
arg0_buf[2] = pdc;
}
if (pdc)
p.pdc = &arg_list;
if (acpi_processor_register_performance(&p, 0))
return -EIO;
printk("number of states: %d\n", p.state_count);
for (i=0; i< p.state_count; i++)
printk(KERN_INFO "acpi_pdump: P%d: %d MHz, %d mW, %d uS s:0x%x c:0x%x\n",
i,
(u32) p.states[i].core_frequency,
(u32) p.states[i].power,
(u32) p.states[i].transition_latency,
(u32) p.states[i].status,
(u32) p.states[i].control);
printk("control_register:\n");
r = &p.control_register;
printk("%d %d %d %d %d %d %lld\n", r->descriptor, r->length, r->space_id,
r->bit_width, r->bit_offset, r->reserved, r->address);
printk("status_register:\n");
r = &p.status_register;
printk("%d %d %d %d %d %d %lld\n", r->descriptor, r->length, r->space_id,
r->bit_width, r->bit_offset, r->reserved, r->address);
acpi_processor_unregister_performance(&p, 0);
return -ENODEV;
}
static void __exit
acpi_pdump_exit (void)
{
return;
}
module_init(acpi_pdump_init);
module_exit(acpi_pdump_exit);
module_param(pdc, uint, 0444);
MODULE_PARM_DESC(pdc, "_PDC capability bits for _PDC revision 1 to be passed to BIOS.");
MODULE_AUTHOR("Dominik Brodowski");
MODULE_DESCRIPTION("Dump content of cpufreq-relevant parts of ACPI tables");
MODULE_LICENSE ("GPL");
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