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Commit 4d4f6aba authored by Imran Khan's avatar Imran Khan
Browse files

arm64: Add support for 32 bit app specific settings 



Add support to enable app specific settings, whenever
a 32 bit application is running.

Change-Id: I0cf40e8ea6e3f9e62258a44ccdd959e9eae09d88
Signed-off-by: default avatarImran Khan <kimran@codeaurora.org>
parent 1a5123de

arch/arm64/include/asm/app_api.h

+7 −0
Original line number Diff line number Diff line
@@ -27,16 +27,23 @@ 
#ifdef CONFIG_MSM_APP_API

extern void set_app_setting_bit(uint32_t bit);

extern void clear_app_setting_bit(uint32_t bit);

extern void set_app_setting_bit_for_32bit_apps(void);

extern void clear_app_setting_bit_for_32bit_apps(void);

#else

static inline void set_app_setting_bit(uint32_t bit) {}

static inline void clear_app_setting_bit(uint32_t bit) {}

static inline void set_app_setting_bit_for_32bit_apps(void) {}

static inline void clear_app_setting_bit_for_32bit_apps(void) {}

#endif



#ifdef CONFIG_MSM_APP_SETTINGS

extern void switch_app_setting_bit(struct task_struct *prev,

				   struct task_struct *next);

extern void switch_32bit_app_setting_bit(struct task_struct *prev,

				   struct task_struct *next);

extern void apply_app_setting_bit(struct file *file);

extern bool use_app_setting;

extern bool use_32bit_app_setting;

#endif



#endif

arch/arm64/kernel/app_api.c

+35 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <asm/app_api.h>



static spinlock_t spinlock;

static spinlock_t spinlock_32bit_app;

static DEFINE_PER_CPU(int, app_config_applied);

static unsigned long app_config_set[NR_CPUS];

static unsigned long app_config_clear[NR_CPUS];
@@ -67,9 +68,43 @@ void clear_app_setting_bit(uint32_t bit) 
}

EXPORT_SYMBOL(clear_app_setting_bit);



void set_app_setting_bit_for_32bit_apps(void)

{

	unsigned long flags;

	uint64_t reg;



	spin_lock_irqsave(&spinlock_32bit_app, flags);

	asm volatile("mrs %0, S3_0_c15_c15_1 " : "=r" (reg));

	reg = reg | BIT(18);

	reg = reg & ~BIT(2);

	reg = reg | 0x3;

	isb();

	asm volatile("msr S3_0_c15_c15_1, %0" : : "r" (reg));

	isb();

	spin_unlock_irqrestore(&spinlock_32bit_app, flags);

}

EXPORT_SYMBOL(set_app_setting_bit_for_32bit_apps);



void clear_app_setting_bit_for_32bit_apps(void)

{

	unsigned long flags;

	uint64_t reg;



	spin_lock_irqsave(&spinlock_32bit_app, flags);

	asm volatile("mrs %0, S3_0_c15_c15_1 " : "=r" (reg));

	reg = reg & ~BIT(18);

	reg = reg & ~0x3;

	isb();

	asm volatile("msr S3_0_c15_c15_1, %0" : : "r" (reg));

	isb();

	spin_unlock_irqrestore(&spinlock_32bit_app, flags);

}

EXPORT_SYMBOL(clear_app_setting_bit_for_32bit_apps);



static int __init init_app_api(void)

{

	spin_lock_init(&spinlock);

	spin_lock_init(&spinlock_32bit_app);

	return 0;

}

early_initcall(init_app_api);

arch/arm64/kernel/app_setting.c

+15 −0
Original line number Diff line number Diff line
@@ -35,6 +35,10 @@ bool use_app_setting = true; 
module_param(use_app_setting, bool, 0644);

MODULE_PARM_DESC(use_app_setting, "control use of app specific settings");



bool use_32bit_app_setting = true;

module_param(use_32bit_app_setting, bool, 0644);

MODULE_PARM_DESC(use_32bit_app_setting, "control use of 32 bit app specific settings");



static int set_name(const char *str, struct kernel_param *kp)

{

	int len = strlen(str);
@@ -87,6 +91,17 @@ void switch_app_setting_bit(struct task_struct *prev, struct task_struct *next) 
}

EXPORT_SYMBOL(switch_app_setting_bit);



void switch_32bit_app_setting_bit(struct task_struct *prev,

					struct task_struct *next)

{

	if (prev->mm && unlikely(is_compat_thread(task_thread_info(prev))))

		clear_app_setting_bit_for_32bit_apps();



	if (next->mm && unlikely(is_compat_thread(task_thread_info(next))))

		set_app_setting_bit_for_32bit_apps();

}

EXPORT_SYMBOL(switch_32bit_app_setting_bit);



void apply_app_setting_bit(struct file *file)

{

	bool found = false;

kernel/sched/core.c

+3 −0
Original line number Diff line number Diff line
@@ -5636,6 +5636,9 @@ prepare_task_switch(struct rq *rq, struct task_struct *prev, 
#ifdef CONFIG_MSM_APP_SETTINGS

	if (use_app_setting)

		switch_app_setting_bit(prev, next);



	if (use_32bit_app_setting)

		switch_32bit_app_setting_bit(prev, next);

#endif

}