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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Author: Qi Hu <[email protected]>
* Huacai Chen <[email protected]>
* Copyright (C) 2020-2023 Loongson Technology Corporation Limited
*/
#ifndef _ASM_LBT_H
#define _ASM_LBT_H
#include <asm/cpu.h>
#include <asm/current.h>
#include <asm/loongarch.h>
#include <asm/processor.h>
extern void _init_lbt(void);
extern void _save_lbt(struct loongarch_lbt *);
extern void _restore_lbt(struct loongarch_lbt *);
static inline int is_lbt_enabled(void)
{
if (!cpu_has_lbt)
return 0;
return (csr_read32(LOONGARCH_CSR_EUEN) & CSR_EUEN_LBTEN) ?
1 : 0;
}
static inline int is_lbt_owner(void)
{
return test_thread_flag(TIF_USEDLBT);
}
#ifdef CONFIG_CPU_HAS_LBT
static inline void enable_lbt(void)
{
if (cpu_has_lbt)
csr_xchg32(CSR_EUEN_LBTEN, CSR_EUEN_LBTEN, LOONGARCH_CSR_EUEN);
}
static inline void disable_lbt(void)
{
if (cpu_has_lbt)
csr_xchg32(0, CSR_EUEN_LBTEN, LOONGARCH_CSR_EUEN);
}
static inline void __own_lbt(void)
{
enable_lbt();
set_thread_flag(TIF_USEDLBT);
KSTK_EUEN(current) |= CSR_EUEN_LBTEN;
}
static inline void own_lbt_inatomic(int restore)
{
if (cpu_has_lbt && !is_lbt_owner()) {
__own_lbt();
if (restore)
_restore_lbt(¤t->thread.lbt);
}
}
static inline void own_lbt(int restore)
{
preempt_disable();
own_lbt_inatomic(restore);
preempt_enable();
}
static inline void lose_lbt_inatomic(int save, struct task_struct *tsk)
{
if (cpu_has_lbt && is_lbt_owner()) {
if (save)
_save_lbt(&tsk->thread.lbt);
disable_lbt();
clear_tsk_thread_flag(tsk, TIF_USEDLBT);
}
KSTK_EUEN(tsk) &= ~(CSR_EUEN_LBTEN);
}
static inline void lose_lbt(int save)
{
preempt_disable();
lose_lbt_inatomic(save, current);
preempt_enable();
}
static inline void init_lbt(void)
{
__own_lbt();
_init_lbt();
}
#else
static inline void own_lbt_inatomic(int restore) {}
static inline void lose_lbt_inatomic(int save, struct task_struct *tsk) {}
static inline void init_lbt(void) {}
static inline void lose_lbt(int save) {}
#endif
static inline int thread_lbt_context_live(void)
{
if (!cpu_has_lbt)
return 0;
return test_thread_flag(TIF_LBT_CTX_LIVE);
}
#endif /* _ASM_LBT_H */
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