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risc-v: Accelerate schedule by percpu

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Fetch TCB info in percpu scratch register for better performance.

Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2024-12-09 13:59:06 +08:00
parent d700641921
commit d96ed13cbd
2 changed files with 31 additions and 1 deletions
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23
arch/risc-v/include/irq.h
View file

@ -703,6 +703,29 @@ irqstate_t up_irq_enable(void);
int up_cpu_index(void) noinstrument_function;
#endif /* CONFIG_ARCH_HAVE_MULTICPU */
/****************************************************************************
* Schedule acceleration macros
****************************************************************************/
/* If RISCV_PERCPU_SCRATCH is not enabled, we can use the scratch register
* to store the current task pointer.
*/
#ifndef CONFIG_RISCV_PERCPU_SCRATCH
#define up_this_task() \
({ \
struct tcb_s *t; \
t = (struct tcb_s *)READ_CSR(CSR_SCRATCH); \
t; \
})
#define up_update_task(t) WRITE_CSR(CSR_SCRATCH, (uintptr_t)t)
#else
/* TODO: Implement up_this_task()/up_update_task() if RISCV_PERCPU_SCRATCH
* enabled.
*/
#endif
/****************************************************************************
* Name: up_this_cpu
*

9
arch/risc-v/src/common/riscv_cpustart.c
View file

@ -37,6 +37,8 @@
#include <nuttx/spinlock.h>
#include <nuttx/sched_note.h>
#include <arch/irq.h>
#include "sched/sched.h"
#include "init/init.h"
#include "riscv_internal.h"
@ -69,6 +71,8 @@
void riscv_cpu_boot(int cpu)
{
struct tcb_s *tcb;
/* Clear IPI for CPU(cpu) */
riscv_ipi_clear(cpu);
@ -100,8 +104,9 @@ void riscv_cpu_boot(int cpu)
_info("CPU%d Started\n", this_cpu());
tcb = current_task(this_cpu());
#ifdef CONFIG_STACK_COLORATION
struct tcb_s *tcb = this_task();
/* If stack debug is enabled, then fill the stack with a
* recognizable value that we can use later to test for high
@ -111,6 +116,8 @@ void riscv_cpu_boot(int cpu)
riscv_stack_color(tcb->stack_alloc_ptr, 0);
#endif
up_update_task(tcb);
/* TODO: Setup FPU */
/* Clear machine software interrupt for CPU(cpu) */