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Subject[PATCH 4/8] X86: Cleanup idle= internal variables by getting rid of idle_halt idle_nomwait
Date
Having four variables for the same thing:
idle_halt, idle_nomwait, force_mwait and boot_option_idle_overrides
is rather confusing and unnecessary complex.

if idle= boot param is passed, only set up one variable:
boot_option_idle_overrides

Introduces following functional changes/fixes:
- intel_idle driver does not register if any idle=xy
boot param is passed.

Signed-off-by: Thomas Renninger <trenn@suse.de>
CC: lenb@kernel.org
CC: linux-acpi@vger.kernel.org
CC: linux-pm@lists.linux-foundation.org
CC: Arjan van de Ven <arjan@linux.intel.com>
CC: Ingo Molnar <mingo@elte.hu>
CC: linux-kernel@vger.kernel.org
---
arch/ia64/include/asm/processor.h | 5 +++--
arch/ia64/kernel/process.c | 6 +-----
arch/x86/include/asm/processor.h | 5 +++--
arch/x86/kernel/process.c | 24 ++++++++----------------
drivers/acpi/processor_core.c | 4 ++--
drivers/acpi/processor_idle.c | 17 ++++++++++++-----
drivers/idle/intel_idle.c | 4 ++++
7 files changed, 33 insertions(+), 32 deletions(-)

diff --git a/arch/ia64/include/asm/processor.h b/arch/ia64/include/asm/processor.h
index 348e44d..b34e5eb 100644
--- a/arch/ia64/include/asm/processor.h
+++ b/arch/ia64/include/asm/processor.h
@@ -717,8 +717,9 @@ prefetchw (const void *x)
#define spin_lock_prefetch(x) prefetchw(x)

extern unsigned long boot_option_idle_override;
-extern unsigned long idle_halt;
-extern unsigned long idle_nomwait;
+
+enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_FORCE_MWAIT,
+ IDLE_NOMWAIT, IDLE_POLL};

#endif /* !__ASSEMBLY__ */

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 16f1c7b..6d33c5c 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -53,12 +53,8 @@

void (*ia64_mark_idle)(int);

-unsigned long boot_option_idle_override = 0;
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);
-unsigned long idle_halt;
-EXPORT_SYMBOL(idle_halt);
-unsigned long idle_nomwait;
-EXPORT_SYMBOL(idle_nomwait);
void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index cae9c3c..77d902a 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -762,10 +762,11 @@ extern void select_idle_routine(const struct cpuinfo_x86 *c);
extern void init_c1e_mask(void);

extern unsigned long boot_option_idle_override;
-extern unsigned long idle_halt;
-extern unsigned long idle_nomwait;
extern bool c1e_detected;

+enum idle_boot_override {IDLE_NO_OVERRIDE = 0, IDLE_HALT, IDLE_NOMWAIT,
+ IDLE_POLL, IDLE_FORCE_MWAIT};
+
extern void enable_sep_cpu(void);
extern int sysenter_setup(void);

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index b618548..62f82de 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -22,11 +22,6 @@
#include <asm/i387.h>
#include <asm/debugreg.h>

-unsigned long idle_halt;
-EXPORT_SYMBOL(idle_halt);
-unsigned long idle_nomwait;
-EXPORT_SYMBOL(idle_nomwait);
-
struct kmem_cache *task_xstate_cachep;
EXPORT_SYMBOL_GPL(task_xstate_cachep);

@@ -328,7 +323,7 @@ long sys_execve(const char __user *name,
/*
* Idle related variables and functions
*/
-unsigned long boot_option_idle_override = 0;
+unsigned long boot_option_idle_override = IDLE_NO_OVERRIDE;
EXPORT_SYMBOL(boot_option_idle_override);

/*
@@ -506,7 +501,6 @@ static void poll_idle(void)
*
* idle=mwait overrides this decision and forces the usage of mwait.
*/
-static int __cpuinitdata force_mwait;

#define MWAIT_INFO 0x05
#define MWAIT_ECX_EXTENDED_INFO 0x01
@@ -516,7 +510,7 @@ static int __cpuinit mwait_usable(const struct cpuinfo_x86 *c)
{
u32 eax, ebx, ecx, edx;

- if (force_mwait)
+ if (boot_option_idle_override == IDLE_FORCE_MWAIT)
return 1;

if (c->cpuid_level < MWAIT_INFO)
@@ -636,9 +630,10 @@ static int __init idle_setup(char *str)
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
- } else if (!strcmp(str, "mwait"))
- force_mwait = 1;
- else if (!strcmp(str, "halt")) {
+ boot_option_idle_override = IDLE_POLL;
+ } else if (!strcmp(str, "mwait")) {
+ boot_option_idle_override = IDLE_FORCE_MWAIT;
+ } else if (!strcmp(str, "halt")) {
/*
* When the boot option of idle=halt is added, halt is
* forced to be used for CPU idle. In such case CPU C2/C3
@@ -647,8 +642,7 @@ static int __init idle_setup(char *str)
* the boot_option_idle_override.
*/
pm_idle = default_idle;
- idle_halt = 1;
- return 0;
+ boot_option_idle_override = IDLE_HALT;
} else if (!strcmp(str, "nomwait")) {
/*
* If the boot option of "idle=nomwait" is added,
@@ -656,12 +650,10 @@ static int __init idle_setup(char *str)
* states. In such case it won't touch the variable
* of boot_option_idle_override.
*/
- idle_nomwait = 1;
- return 0;
+ boot_option_idle_override = IDLE_NOMWAIT;
} else
return -1;

- boot_option_idle_override = 1;
return 0;
}
early_param("idle", idle_setup);
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c
index bec561c..3c1a2fe 100644
--- a/drivers/acpi/processor_core.c
+++ b/drivers/acpi/processor_core.c
@@ -23,7 +23,7 @@ static int set_no_mwait(const struct dmi_system_id *id)
{
printk(KERN_NOTICE PREFIX "%s detected - "
"disabling mwait for CPU C-states\n", id->ident);
- idle_nomwait = 1;
+ boot_option_idle_override = IDLE_NOMWAIT;
return 0;
}

@@ -283,7 +283,7 @@ acpi_processor_eval_pdc(acpi_handle handle, struct acpi_object_list *pdc_in)
{
acpi_status status = AE_OK;

- if (idle_nomwait) {
+ if (boot_option_idle_override == IDLE_NOMWAIT) {
/*
* If mwait is disabled for CPU C-states, the C2C3_FFH access
* mode will be disabled in the parameter of _PDC object.
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 104ae77..dda3412 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -79,6 +79,12 @@ module_param(bm_check_disable, uint, 0000);
static unsigned int latency_factor __read_mostly = 2;
module_param(latency_factor, uint, 0644);

+static int disabled_by_idle_boot_param(void)
+{
+ return boot_option_idle_override == IDLE_POLL ||
+ boot_option_idle_override == IDLE_FORCE_MWAIT;
+}
+
/*
* IBM ThinkPad R40e crashes mysteriously when going into C2 or C3.
* For now disable this. Probably a bug somewhere else.
@@ -455,7 +461,8 @@ static int acpi_processor_get_power_info_cst(struct acpi_processor *pr)
continue;
}
if (cx.type == ACPI_STATE_C1 &&
- (idle_halt || idle_nomwait)) {
+ (boot_option_idle_override == IDLE_HALT ||
+ boot_option_idle_override == IDLE_NOMWAIT)) {
/*
* In most cases the C1 space_id obtained from
* _CST object is FIXED_HARDWARE access mode.
@@ -1060,7 +1067,7 @@ int acpi_processor_cst_has_changed(struct acpi_processor *pr)
{
int ret = 0;

- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;

if (!pr)
@@ -1091,11 +1098,11 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
acpi_status status = 0;
static int first_run;

- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;

if (!first_run) {
- if (idle_halt) {
+ if (boot_option_idle_override == IDLE_HALT) {
/*
* When the boot option of "idle=halt" is added, halt
* is used for CPU IDLE.
@@ -1144,7 +1151,7 @@ int __cpuinit acpi_processor_power_init(struct acpi_processor *pr,
int acpi_processor_power_exit(struct acpi_processor *pr,
struct acpi_device *device)
{
- if (boot_option_idle_override)
+ if (disabled_by_idle_boot_param())
return 0;

cpuidle_unregister_device(&pr->power.dev);
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 60414ae..f0798ff 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -407,6 +407,10 @@ static int __init intel_idle_init(void)
{
int retval;

+ /* Do not load intel_idle at all for now if idle= is passed */
+ if (boot_option_idle_override != IDLE_NO_OVERRIDE)
+ return -ENODEV;
+
retval = intel_idle_probe();
if (retval)
return retval;
--
1.6.0.2


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