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riscv: irq_offload: simpler implementation

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Get rid of all those global variables and IRQ locking.
Use the regular IRQ exit path to let tests validate preemption properly.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2022-03-07 13:24:38 -05:00 • committed by Anas Nashif
commit cb5221c087
2 changed files with 15 additions and 29 deletions
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22
arch/riscv/core/irq_offload.c
View file

@ -1,31 +1,13 @@
/*
* Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
* Copyright (c) 2022 BayLibre SAS
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <irq.h>
#include <irq_offload.h>
#include <arch/riscv/syscall.h>
static irq_offload_routine_t offload_routine;
static const void *offload_param;
/*
* Called by _enter_irq
*/
void z_irq_do_offload(void)
{
offload_routine(offload_param);
}
void arch_irq_offload(irq_offload_routine_t routine, const void *parameter)
{
unsigned int key;
key = irq_lock();
offload_routine = routine;
offload_param = parameter;
arch_syscall_invoke0(RV_ECALL_IRQ_OFFLOAD);
irq_unlock(key);
arch_syscall_invoke2((uintptr_t)routine, (uintptr_t)parameter, RV_ECALL_IRQ_OFFLOAD);
}

22
arch/riscv/core/isr.S
View file

@ -318,6 +318,14 @@ do_fault:
#if defined(CONFIG_IRQ_OFFLOAD)
do_irq_offload:
/*
* Retrieve provided routine and argument from the stack.
* Routine pointer is in saved a0, argument in saved a1
* so we load them with a1/a0 (reversed).
*/
lr a1, __z_arch_esf_t_a0_OFFSET(sp)
lr a0, __z_arch_esf_t_a1_OFFSET(sp)
/* Set _kernel.cpus[0].nested variable to 1 */
la t1, _kernel
li t0, 1
@ -331,16 +339,11 @@ do_irq_offload:
addi sp, sp, -16
sr t0, 0(sp)
call z_irq_do_offload
/* Execute provided routine (argument is in a0 already). */
jalr ra, a1, 0
/* Set _kernel.cpus[0].nested variable back to 0 */
la t1, _kernel
sw zero, _kernel_offset_to_nested(t1)
/* return to the regular stack */
lr sp, 0(sp)
j no_reschedule
/* Leave through the regular IRQ exit path */
j irq_done
#endif /* CONFIG_IRQ_OFFLOAD */
#ifdef CONFIG_USERSPACE
@ -446,6 +449,7 @@ on_irq_stack:
/* Call ISR function */
jalr ra, t1, 0
irq_done:
/* Decrement _kernel.cpus[0].nested variable */
la t1, _kernel
lw t2, _kernel_offset_to_nested(t1)