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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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2
arch/i386/kernel/acpi/Makefile
View File

@ -3,6 +3,6 @@ obj-$(CONFIG_X86_IO_APIC) += earlyquirk.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o
ifneq ($(CONFIG_ACPI_PROCESSOR),)
obj-y += cstate.o
obj-y += cstate.o processor.o
endif

58
arch/i386/kernel/acpi/cstate.c
View File

@ -14,64 +14,6 @@
#include <acpi/processor.h>
#include <asm/acpi.h>
static void acpi_processor_power_init_intel_pdc(struct acpi_processor_power
*pow)
{
struct acpi_object_list *obj_list;
union acpi_object *obj;
u32 *buf;
/* allocate and initialize pdc. It will be used later. */
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
if (!obj_list) {
printk(KERN_ERR "Memory allocation error\n");
return;
}
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
if (!obj) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj_list);
return;
}
buf = kmalloc(12, GFP_KERNEL);
if (!buf) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj);
kfree(obj_list);
return;
}
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = 12;
obj->buffer.pointer = (u8 *) buf;
obj_list->count = 1;
obj_list->pointer = obj;
pow->pdc = obj_list;
return;
}
/* Initialize _PDC data based on the CPU vendor */
void acpi_processor_power_init_pdc(struct acpi_processor_power *pow,
unsigned int cpu)
{
struct cpuinfo_x86 *c = cpu_data + cpu;
pow->pdc = NULL;
if (c->x86_vendor == X86_VENDOR_INTEL)
acpi_processor_power_init_intel_pdc(pow);
return;
}
EXPORT_SYMBOL(acpi_processor_power_init_pdc);
/*
* Initialize bm_flags based on the CPU cache properties
* On SMP it depends on cache configuration

75
arch/i386/kernel/acpi/processor.c Normal file
View File

@ -0,0 +1,75 @@
/*
* arch/i386/kernel/acpi/processor.c
*
* Copyright (C) 2005 Intel Corporation
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
* - Added _PDC for platforms with Intel CPUs
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#include <asm/acpi.h>
static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
{
struct acpi_object_list *obj_list;
union acpi_object *obj;
u32 *buf;
/* allocate and initialize pdc. It will be used later. */
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
if (!obj_list) {
printk(KERN_ERR "Memory allocation error\n");
return;
}
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
if (!obj) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj_list);
return;
}
buf = kmalloc(12, GFP_KERNEL);
if (!buf) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj);
kfree(obj_list);
return;
}
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = ACPI_PDC_C_CAPABILITY_SMP;
if (cpu_has(c, X86_FEATURE_EST))
buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP;
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = 12;
obj->buffer.pointer = (u8 *) buf;
obj_list->count = 1;
obj_list->pointer = obj;
pr->pdc = obj_list;
return;
}
/* Initialize _PDC data based on the CPU vendor */
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
{
unsigned int cpu = pr->id;
struct cpuinfo_x86 *c = cpu_data + cpu;
pr->pdc = NULL;
if (c->x86_vendor == X86_VENDOR_INTEL)
init_intel_pdc(pr, c);
return;
}
EXPORT_SYMBOL(arch_acpi_processor_init_pdc);

67
arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c
View File

@ -297,68 +297,6 @@ acpi_cpufreq_guess_freq (
}
/*
* acpi_processor_cpu_init_pdc_est - let BIOS know about the SMP capabilities
* of this driver
* @perf: processor-specific acpi_io_data struct
* @cpu: CPU being initialized
*
* To avoid issues with legacy OSes, some BIOSes require to be informed of
* the SMP capabilities of OS P-state driver. Here we set the bits in _PDC
* accordingly, for Enhanced Speedstep. Actual call to _PDC is done in
* driver/acpi/processor.c
*/
static void
acpi_processor_cpu_init_pdc_est(
struct acpi_processor_performance *perf,
unsigned int cpu,
struct acpi_object_list *obj_list
)
{
union acpi_object *obj;
u32 *buf;
struct cpuinfo_x86 *c = cpu_data + cpu;
dprintk("acpi_processor_cpu_init_pdc_est\n");
if (!cpu_has(c, X86_FEATURE_EST))
return;
/* Initialize pdc. It will be used later. */
if (!obj_list)
return;
if (!(obj_list->count && obj_list->pointer))
return;
obj = obj_list->pointer;
if ((obj->buffer.length == 12) && obj->buffer.pointer) {
buf = (u32 *)obj->buffer.pointer;
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
perf->pdc = obj_list;
}
return;
}
/* CPU specific PDC initialization */
static void
acpi_processor_cpu_init_pdc(
struct acpi_processor_performance *perf,
unsigned int cpu,
struct acpi_object_list *obj_list
)
{
struct cpuinfo_x86 *c = cpu_data + cpu;
dprintk("acpi_processor_cpu_init_pdc\n");
perf->pdc = NULL;
if (cpu_has(c, X86_FEATURE_EST))
acpi_processor_cpu_init_pdc_est(perf, cpu, obj_list);
return;
}
static int
acpi_cpufreq_cpu_init (
struct cpufreq_policy *policy)
@ -373,9 +311,6 @@ acpi_cpufreq_cpu_init (
struct acpi_object_list arg_list = {1, &arg0};
dprintk("acpi_cpufreq_cpu_init\n");
/* setup arg_list for _PDC settings */
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
if (!data)
@ -383,9 +318,7 @@ acpi_cpufreq_cpu_init (
acpi_io_data[cpu] = data;
acpi_processor_cpu_init_pdc(&data->acpi_data, cpu, &arg_list);
result = acpi_processor_register_performance(&data->acpi_data, cpu);
data->acpi_data.pdc = NULL;
if (result)
goto err_free;

12
arch/i386/kernel/cpu/cpufreq/speedstep-centrino.c
View File

@ -364,22 +364,10 @@ static struct acpi_processor_performance p;
*/
static int centrino_cpu_init_acpi(struct cpufreq_policy *policy)
{
union acpi_object arg0 = {ACPI_TYPE_BUFFER};
u32 arg0_buf[3];
struct acpi_object_list arg_list = {1, &arg0};
unsigned long cur_freq;
int result = 0, i;
unsigned int cpu = policy->cpu;
/* _PDC settings */
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
arg0_buf[0] = ACPI_PDC_REVISION_ID;
arg0_buf[1] = 1;
arg0_buf[2] = ACPI_PDC_EST_CAPABILITY_SMP_MSR;
p.pdc = &arg_list;
/* register with ACPI core */
if (acpi_processor_register_performance(&p, cpu)) {
dprintk(KERN_INFO PFX "obtaining ACPI data failed\n");

5
arch/ia64/kernel/cpufreq/Makefile
View File

@ -1 +1,6 @@
obj-$(CONFIG_IA64_ACPI_CPUFREQ) += acpi-cpufreq.o
ifneq ($(CONFIG_ACPI_PROCESSOR),)
obj-y += acpi-processor.o
endif

51
arch/ia64/kernel/cpufreq/acpi-cpufreq.c
View File

@ -269,48 +269,6 @@ acpi_cpufreq_verify (
}
/*
* processor_init_pdc - let BIOS know about the SMP capabilities
* of this driver
* @perf: processor-specific acpi_io_data struct
* @cpu: CPU being initialized
*
* To avoid issues with legacy OSes, some BIOSes require to be informed of
* the SMP capabilities of OS P-state driver. Here we set the bits in _PDC
* accordingly. Actual call to _PDC is done in driver/acpi/processor.c
*/
static void
processor_init_pdc (
struct acpi_processor_performance *perf,
unsigned int cpu,
struct acpi_object_list *obj_list
)
{
union acpi_object *obj;
u32 *buf;
dprintk("processor_init_pdc\n");
perf->pdc = NULL;
/* Initialize pdc. It will be used later. */
if (!obj_list)
return;
if (!(obj_list->count && obj_list->pointer))
return;
obj = obj_list->pointer;
if ((obj->buffer.length == 12) && obj->buffer.pointer) {
buf = (u32 *)obj->buffer.pointer;
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
perf->pdc = obj_list;
}
return;
}
static int
acpi_cpufreq_cpu_init (
struct cpufreq_policy *policy)
@ -320,14 +278,7 @@ acpi_cpufreq_cpu_init (
struct cpufreq_acpi_io *data;
unsigned int result = 0;
union acpi_object arg0 = {ACPI_TYPE_BUFFER};
u32 arg0_buf[3];
struct acpi_object_list arg_list = {1, &arg0};
dprintk("acpi_cpufreq_cpu_init\n");
/* setup arg_list for _PDC settings */
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
data = kmalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL);
if (!data)
@ -337,9 +288,7 @@ acpi_cpufreq_cpu_init (
acpi_io_data[cpu] = data;
processor_init_pdc(&data->acpi_data, cpu, &arg_list);
result = acpi_processor_register_performance(&data->acpi_data, cpu);
data->acpi_data.pdc = NULL;
if (result)
goto err_free;

67
arch/ia64/kernel/cpufreq/acpi-processor.c Normal file
View File

@ -0,0 +1,67 @@
/*
* arch/ia64/kernel/cpufreq/processor.c
*
* Copyright (C) 2005 Intel Corporation
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
* - Added _PDC for platforms with Intel CPUs
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#include <asm/acpi.h>
static void init_intel_pdc(struct acpi_processor *pr)
{
struct acpi_object_list *obj_list;
union acpi_object *obj;
u32 *buf;
/* allocate and initialize pdc. It will be used later. */
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
if (!obj_list) {
printk(KERN_ERR "Memory allocation error\n");
return;
}
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
if (!obj) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj_list);
return;
}
buf = kmalloc(12, GFP_KERNEL);
if (!buf) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj);
kfree(obj_list);
return;
}
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] |= ACPI_PDC_EST_CAPABILITY_SMP;
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = 12;
obj->buffer.pointer = (u8 *) buf;
obj_list->count = 1;
obj_list->pointer = obj;
pr->pdc = obj_list;
return;
}
/* Initialize _PDC data based on the CPU vendor */
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
{
pr->pdc = NULL;
init_intel_pdc(pr);
return;
}
EXPORT_SYMBOL(arch_acpi_processor_init_pdc);

5
arch/x86_64/kernel/acpi/Makefile
View File

@ -1,3 +1,8 @@
obj-y := boot.o
boot-y := ../../../i386/kernel/acpi/boot.o
obj-$(CONFIG_ACPI_SLEEP) += sleep.o wakeup.o
ifneq ($(CONFIG_ACPI_PROCESSOR),)
obj-y += processor.o
endif

72
arch/x86_64/kernel/acpi/processor.c Normal file
View File

@ -0,0 +1,72 @@
/*
* arch/x86_64/kernel/acpi/processor.c
*
* Copyright (C) 2005 Intel Corporation
* Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
* - Added _PDC for platforms with Intel CPUs
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <acpi/processor.h>
#include <asm/acpi.h>
static void init_intel_pdc(struct acpi_processor *pr, struct cpuinfo_x86 *c)
{
struct acpi_object_list *obj_list;
union acpi_object *obj;
u32 *buf;
/* allocate and initialize pdc. It will be used later. */
obj_list = kmalloc(sizeof(struct acpi_object_list), GFP_KERNEL);
if (!obj_list) {
printk(KERN_ERR "Memory allocation error\n");
return;
}
obj = kmalloc(sizeof(union acpi_object), GFP_KERNEL);
if (!obj) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj_list);
return;
}
buf = kmalloc(12, GFP_KERNEL);
if (!buf) {
printk(KERN_ERR "Memory allocation error\n");
kfree(obj);
kfree(obj_list);
return;
}
buf[0] = ACPI_PDC_REVISION_ID;
buf[1] = 1;
buf[2] = ACPI_PDC_EST_CAPABILITY_SMP;
obj->type = ACPI_TYPE_BUFFER;
obj->buffer.length = 12;
obj->buffer.pointer = (u8 *) buf;
obj_list->count = 1;
obj_list->pointer = obj;
pr->pdc = obj_list;
return;
}
/* Initialize _PDC data based on the CPU vendor */
void arch_acpi_processor_init_pdc(struct acpi_processor *pr)
{
unsigned int cpu = pr->id;
struct cpuinfo_x86 *c = cpu_data + cpu;
pr->pdc = NULL;
if (c->x86_vendor == X86_VENDOR_INTEL && cpu_has(c, X86_FEATURE_EST))
init_intel_pdc(pr, c);
return;
}
EXPORT_SYMBOL(arch_acpi_processor_init_pdc);

28
drivers/acpi/processor_core.c
View File

@ -253,31 +253,21 @@ static int acpi_processor_errata(struct acpi_processor *pr)
* _PDC is required for a BIOS-OS handshake for most of the newer
* ACPI processor features.
*/
int acpi_processor_set_pdc(struct acpi_processor *pr,
struct acpi_object_list *pdc_in)
static int acpi_processor_set_pdc(struct acpi_processor *pr)
{
struct acpi_object_list *pdc_in = pr->pdc;
acpi_status status = AE_OK;
u32 arg0_buf[3];
union acpi_object arg0 = { ACPI_TYPE_BUFFER };
struct acpi_object_list no_object = { 1, &arg0 };
struct acpi_object_list *pdc;
ACPI_FUNCTION_TRACE("acpi_processor_set_pdc");
arg0.buffer.length = 12;
arg0.buffer.pointer = (u8 *) arg0_buf;
arg0_buf[0] = ACPI_PDC_REVISION_ID;
arg0_buf[1] = 0;
arg0_buf[2] = 0;
if (!pdc_in)
return_VALUE(status);
pdc = (pdc_in) ? pdc_in : &no_object;
status = acpi_evaluate_object(pr->handle, "_PDC", pdc_in, NULL);
status = acpi_evaluate_object(pr->handle, "_PDC", pdc, NULL);
if ((ACPI_FAILURE(status)) && (pdc_in))
if (ACPI_FAILURE(status))
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Error evaluating _PDC, using legacy perf. control...\n"));
"Could not evaluate _PDC, using legacy perf. control...\n"));
return_VALUE(status);
}
@ -574,6 +564,10 @@ static int acpi_processor_start(struct acpi_device *device)
"Error installing device notify handler\n"));
}
/* _PDC call should be done before doing anything else (if reqd.). */
arch_acpi_processor_init_pdc(pr);
acpi_processor_set_pdc(pr);
acpi_processor_power_init(pr, device);
if (pr->flags.throttling) {

2
drivers/acpi/processor_idle.c
View File

@ -1014,8 +1014,6 @@ int acpi_processor_power_init(struct acpi_processor *pr,
}
}
acpi_processor_power_init_pdc(&(pr->power), pr->id);
acpi_processor_set_pdc(pr, pr->power.pdc);
acpi_processor_get_power_info(pr);
/*

2
drivers/acpi/processor_perflib.c
View File

@ -315,8 +315,6 @@ static int acpi_processor_get_performance_info(struct acpi_processor *pr)
if (!pr || !pr->performance || !pr->handle)
return_VALUE(-EINVAL);
acpi_processor_set_pdc(pr, pr->performance->pdc);
status = acpi_get_handle(pr->handle, "_PCT", &handle);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,

4
include/acpi/pdc_intel.h
View File

@ -15,9 +15,7 @@
#define ACPI_PDC_C_C1_FFH (0x0100)
#define ACPI_PDC_EST_CAPABILITY_SMP (ACPI_PDC_SMP_C1PT | \
ACPI_PDC_C_C1_HALT)
#define ACPI_PDC_EST_CAPABILITY_SMP_MSR (ACPI_PDC_EST_CAPABILITY_SMP | \
ACPI_PDC_C_C1_HALT | \
ACPI_PDC_P_FFH)
#define ACPI_PDC_C_CAPABILITY_SMP (ACPI_PDC_SMP_C2C3 | \

22
include/acpi/processor.h
View File

@ -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)

2
include/asm-i386/acpi.h
View File

@ -179,7 +179,7 @@ extern void acpi_reserve_bootmem(void);
extern u8 x86_acpiid_to_apicid[];
#define ARCH_HAS_POWER_PDC_INIT 1
#define ARCH_HAS_POWER_INIT 1
#endif /*__KERNEL__*/