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[arm64] add hw thread self (#8942)

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* [libcpu] arm64: Add hardware thread_self support

This patch introduces hardware-based thread self-identification
for the AArch64 architecture. It optimizes thread management by
using hardware registers to store and access the current thread's
pointer, reducing overhead and improving overall performance.

Changes include:
- Added `ARCH_USING_HW_THREAD_SELF` configuration option.
- Modified `rtdef.h`, `rtsched.h` to conditionally include
  `critical_switch_flag` based on the new config.
- Updated context management in `context_gcc.S`, `cpuport.h`
  to support hardware-based thread self.
- Enhanced `scheduler_mp.c` and `thread.c` to leverage the new
  hardware thread self feature.

These modifications ensure better scheduling and thread handling,
particularly in multi-core environments, by minimizing the
software overhead associated with thread management.

Signed-off-by: Shell <smokewood@qq.com>

* fixup: address suggestion

* fixup: rt_current_thread as global

* scheduler: add cpu object for UP scheduler

Also, maintain the rt_current_thread in cpu object on UP scheduler.

---------

Signed-off-by: Shell <smokewood@qq.com>
This commit is contained in:
Shell
2024-05-28 14:27:55 +08:00
committed by GitHub
parent b45fb59df2
commit f17f994f8c
12 changed files with 211 additions and 80 deletions
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15
include/rtdef.h
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@@ -740,8 +740,10 @@ struct rt_cpu
struct rt_thread *current_thread;
rt_uint8_t irq_switch_flag:1;
rt_uint8_t critical_switch_flag:1;
rt_uint8_t sched_lock_flag:1;
#ifndef ARCH_USING_HW_THREAD_SELF
rt_uint8_t critical_switch_flag:1;
#endif /* ARCH_USING_HW_THREAD_SELF */
rt_uint8_t current_priority;
rt_list_t priority_table[RT_THREAD_PRIORITY_MAX];
@@ -763,10 +765,19 @@ struct rt_cpu
struct rt_cpu_usage_stats cpu_stat;
#endif
};
typedef struct rt_cpu *rt_cpu_t;
#else /* !RT_USING_SMP */
struct rt_cpu
{
struct rt_thread *current_thread;
};
#endif /* RT_USING_SMP */
typedef struct rt_cpu *rt_cpu_t;
/* Noted: As API to reject writing to this variable from application codes */
#define rt_current_thread rt_thread_self()
struct rt_thread;
#ifdef RT_USING_SMART

5
include/rtsched.h
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@@ -56,6 +56,10 @@ struct rt_sched_thread_ctx
rt_uint8_t sched_flag_locked:1; /**< calling thread have the scheduler locked */
rt_uint8_t sched_flag_ttmr_set:1; /**< thread timer is start */
#ifdef ARCH_USING_HW_THREAD_SELF
rt_uint8_t critical_switch_flag:1; /**< critical switch pending */
#endif /* ARCH_USING_HW_THREAD_SELF */
#ifdef RT_USING_SMP
rt_uint8_t bind_cpu; /**< thread is bind to cpu */
rt_uint8_t oncpu; /**< process on cpu */
@@ -170,6 +174,7 @@ rt_err_t rt_sched_thread_timer_stop(struct rt_thread *thread);
rt_err_t rt_sched_thread_timer_start(struct rt_thread *thread);
void rt_sched_insert_thread(struct rt_thread *thread);
void rt_sched_remove_thread(struct rt_thread *thread);
struct rt_thread *rt_sched_thread_self(void);
#endif /* defined(__RT_KERNEL_SOURCE__) || defined(__RT_IPC_SOURCE__) */

9
include/rtthread.h
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@@ -669,6 +669,12 @@ rt_err_t rt_device_control(rt_device_t dev, int cmd, void *arg);
void rt_interrupt_enter(void);
void rt_interrupt_leave(void);
/**
* CPU object
*/
struct rt_cpu *rt_cpu_self(void);
struct rt_cpu *rt_cpu_index(int index);
#ifdef RT_USING_SMP
/*
@@ -679,9 +685,6 @@ rt_base_t rt_cpus_lock(void);
void rt_cpus_unlock(rt_base_t level);
void rt_cpus_lock_status_restore(struct rt_thread *thread);
struct rt_cpu *rt_cpu_self(void);
struct rt_cpu *rt_cpu_index(int index);
#ifdef RT_USING_DEBUG
rt_base_t rt_cpu_get_id(void);
#else /* !RT_USING_DEBUG */