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RISC-V: self-contained IPI handling routine

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Currently, the IPI handling routine riscv_software_interrupt() does
not take any argument and also does not perform irq_enter()/irq_exit().

This patch makes IPI handling routine more self-contained by:
1. Passing "pt_regs *" argument
2. Explicitly doing irq_enter()/irq_exit()
3. Explicitly save/restore "pt_regs *" using set_irq_regs()

With above changes, IPI handling routine does not depend on caller
function to perform irq_enter()/irq_exit() and save/restore of
"pt_regs *" hence its more self-contained. This also enables us
to call IPI handling routine from IRQCHIP drivers.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Anup Patel
2020-06-01 14:45:38 +05:30
committed by Palmer Dabbelt
parent e8c7ef7d58
commit 5cf998ba8c
4 changed files with 22 additions and 9 deletions
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16
arch/riscv/kernel/irq.c
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@@ -19,12 +19,15 @@ int arch_show_interrupts(struct seq_file *p, int prec)
asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
struct pt_regs *old_regs;
irq_enter();
switch (regs->cause & ~CAUSE_IRQ_FLAG) {
case RV_IRQ_TIMER:
old_regs = set_irq_regs(regs);
irq_enter();
riscv_timer_interrupt();
irq_exit();
set_irq_regs(old_regs);
break;
#ifdef CONFIG_SMP
case RV_IRQ_SOFT:
@@ -32,19 +35,20 @@ asmlinkage __visible void __irq_entry do_IRQ(struct pt_regs *regs)
* We only use software interrupts to pass IPIs, so if a non-SMP
* system gets one, then we don't know what to do.
*/
riscv_software_interrupt();
handle_IPI(regs);
break;
#endif
case RV_IRQ_EXT:
old_regs = set_irq_regs(regs);
irq_enter();
handle_arch_irq(regs);
irq_exit();
set_irq_regs(old_regs);
break;
default:
pr_alert("unexpected interrupt cause 0x%lx", regs->cause);
BUG();
}
irq_exit();
set_irq_regs(old_regs);
}
void __init init_IRQ(void)