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[ACPI] Avoid BIOS inflicted crashes by evaluating _PDC only once

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Linux invokes the AML _PDC method (Processor Driver Capabilities)
to tell the BIOS what features it can handle.  While the ACPI
spec says nothing about the OS invoking _PDC multiple times,
doing so with changing bits seems to hopelessly confuse the BIOS
on multiple platforms up to and including crashing the system.

Factor out the _PDC invocation so Linux invokes it only once.

http://bugzilla.kernel.org/show_bug.cgi?id=5483

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Venkatesh Pallipadi
2005-10-23 16:31:00 -04:00
committed by Len Brown
parent d2149b5423
commit 05131ecc99
16 changed files with 243 additions and 231 deletions
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22
include/acpi/processor.h
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@ -62,9 +62,6 @@ struct acpi_processor_power {
u32 bm_activity;
int count;
struct acpi_processor_cx states[ACPI_PROCESSOR_MAX_POWER];
/* the _PDC objects passed by the driver, if any */
struct acpi_object_list *pdc;
};
/* Performance Management */
@ -96,8 +93,6 @@ struct acpi_processor_performance {
unsigned int state_count;
struct acpi_processor_px *states;
/* the _PDC objects passed by the driver, if any */
struct acpi_object_list *pdc;
};
/* Throttling Control */
@ -151,6 +146,9 @@ struct acpi_processor {
struct acpi_processor_performance *performance;
struct acpi_processor_throttling throttling;
struct acpi_processor_limit limit;
/* the _PDC objects for this processor, if any */
struct acpi_object_list *pdc;
};
struct acpi_processor_errata {
@ -178,22 +176,12 @@ int acpi_processor_notify_smm(struct module *calling_module);
extern struct acpi_processor *processors[NR_CPUS];
extern struct acpi_processor_errata errata;
int acpi_processor_set_pdc(struct acpi_processor *pr,
struct acpi_object_list *pdc_in);
void arch_acpi_processor_init_pdc(struct acpi_processor *pr);
#ifdef ARCH_HAS_POWER_PDC_INIT
void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
unsigned int cpu);
#ifdef ARCH_HAS_POWER_INIT
void acpi_processor_power_init_bm_check(struct acpi_processor_flags *flags,
unsigned int cpu);
#else
static inline void acpi_processor_power_init_pdc(struct acpi_processor_power
*pow, unsigned int cpu)
{
pow->pdc = NULL;
return;
}
static inline void acpi_processor_power_init_bm_check(struct
acpi_processor_flags
*flags, unsigned int cpu)