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Commit e66e78d4 authored by Sarangdhar Joshi's avatar Sarangdhar Joshi Committed by Trilok Soni
Browse files

arm64: Add support for app specific settings 



Add support to provide an interface that can be used from
userspace to decide whether app specific settings need to
be applied / cleared when particular processes are running.

CRs-Fixed: 981519
Change-Id: Id81f8b70de64f291a8586150f4d2c7c8f8b4420f
Signed-off-by: default avatarSarangdhar Joshi <spjoshi@codeaurora.org>
parent 53d1dd96

arch/arm64/Kconfig

+21 −0
Original line number Diff line number Diff line
@@ -495,9 +495,20 @@ config ARM64_ICACHE_DISABLE 


	  If you are not sure what to do, select 'N' here.



config MSM_APP_API

	bool "API support to enable / disable app settings for MSM8996"

	depends on ARCH_MSM8996 && (ENABLE_FP_SIMD_SETTINGS || MSM_APP_SETTINGS)

	help

	  Add API support to enable / disable the app settings to be used

	  at runtime. These APIs are used to enable / disable app setting

	  when specific aarch32 or aarch64 processes are running.



	  If you are not sure what to do, select 'N' here.



config ENABLE_FP_SIMD_SETTINGS

	bool "Enable FP(Floating Point) Settings for Qualcomm MSM8996"

	depends on ARCH_MSM8996

	select MSM_APP_API

	help

	  Enable FP(Floating Point) and SIMD settings for the MSM8996 during

	  the execution of the aarch32 processes and disable these settings
@@ -505,6 +516,16 @@ config ENABLE_FP_SIMD_SETTINGS 


	  If you are not sure what to do, select 'N' here.



config MSM_APP_SETTINGS

	bool "Support to enable / disable app settings for MSM8996"

	depends on ARCH_MSM8996

	select MSM_APP_API

	help

	  Expose an interface used by the userspace at runtime to

	  enable / disable the app specific settings.



	  If you are not sure what to do, select 'N' here.



choice

	prompt "Virtual address space size"

	default ARM64_VA_BITS_39 if ARM64_4K_PAGES

arch/arm64/include/asm/app_api.h

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2016, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#ifndef __ASM_APP_API_H

#define __ASM_APP_API_H



#include <linux/types.h>



#define APP_SETTING_BIT		30

#define MAX_ENTRIES		10



/*

 * APIs to set / clear the app setting bits

 * in the register.

 */

#ifdef CONFIG_MSM_APP_API

extern void set_app_setting_bit(uint32_t bit);

extern void clear_app_setting_bit(uint32_t bit);

#else

static inline void set_app_setting_bit(uint32_t bit) {}

static inline void clear_app_setting_bit(uint32_t bit) {}

#endif



#ifdef CONFIG_MSM_APP_SETTINGS

extern void get_lib_names(char *names[], unsigned int *cnt);

#else

static inline void get_lib_names(char *names[], unsigned int *cnt)

{

	*cnt = 0;

}

#endif



#endif

arch/arm64/include/asm/fpsimd.h

+0 −4
Original line number Diff line number Diff line
@@ -84,13 +84,9 @@ extern void fpsimd_load_partial_state(struct fpsimd_partial_state *state); 
#ifdef CONFIG_ENABLE_FP_SIMD_SETTINGS

extern void fpsimd_disable_trap(void);

extern void fpsimd_enable_trap(void);

extern void fpsimd_settings_disable(void);

extern void fpsimd_settings_enable(void);

#else

static inline void fpsimd_disable_trap(void) {}

static inline void fpsimd_enable_trap(void) {}

static inline void fpsimd_settings_disable(void) {}

static inline void fpsimd_settings_enable(void) {}

#endif



#endif

arch/arm64/kernel/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -38,6 +38,8 @@ arm64-obj-$(CONFIG_KGDB) += kgdb.o 
arm64-obj-$(CONFIG_EFI)			+= efi.o efi-stub.o efi-entry.o

arm64-obj-$(CONFIG_PCI)			+= pci.o

arm64-obj-$(CONFIG_ARMV8_DEPRECATED)	+= armv8_deprecated.o

arm64-obj-$(CONFIG_MSM_APP_API)		+= app_api.o

arm64-obj-$(CONFIG_MSM_APP_SETTINGS)	+= app_setting.o



obj-y					+= $(arm64-obj-y) vdso/

obj-m					+= $(arm64-obj-m)

arch/arm64/kernel/app_api.c

0 → 100644
+75 −0
Original line number Diff line number Diff line 
/* Copyright (c) 2016, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */



#include <linux/bitops.h>

#include <linux/spinlock.h>

#include <linux/cpu.h>

#include <linux/export.h>



#include <asm/app_api.h>



static spinlock_t spinlock;

static DEFINE_PER_CPU(int, app_config_applied);

static unsigned long app_config_set[NR_CPUS];

static unsigned long app_config_clear[NR_CPUS];



void set_app_setting_bit(uint32_t bit)

{

	unsigned long flags;

	uint64_t reg;

	int cpu;



	spin_lock_irqsave(&spinlock, flags);

	asm volatile("mrs %0, S3_1_C15_C15_0" : "=r" (reg));

	reg = reg | BIT(bit);

	isb();

	asm volatile("msr S3_1_C15_C15_0, %0" : : "r" (reg));

	isb();

	if (bit == APP_SETTING_BIT) {

		cpu = raw_smp_processor_id();

		app_config_set[cpu]++;



		this_cpu_write(app_config_applied, 1);

	}

	spin_unlock_irqrestore(&spinlock, flags);



}

EXPORT_SYMBOL(set_app_setting_bit);



void clear_app_setting_bit(uint32_t bit)

{

	unsigned long flags;

	uint64_t reg;

	int cpu;



	spin_lock_irqsave(&spinlock, flags);

	asm volatile("mrs %0, S3_1_C15_C15_0" : "=r" (reg));

	reg = reg & ~BIT(bit);

	isb();

	asm volatile("msr S3_1_C15_C15_0, %0" : : "r" (reg));

	isb();

	if (bit == APP_SETTING_BIT) {

		cpu = raw_smp_processor_id();

		app_config_clear[cpu]++;



		this_cpu_write(app_config_applied, 0);

	}

	spin_unlock_irqrestore(&spinlock, flags);

}

EXPORT_SYMBOL(clear_app_setting_bit);



static int __init init_app_api(void)

{

	spin_lock_init(&spinlock);

	return 0;

}

early_initcall(init_app_api);