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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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11
arch/riscv/kernel/smp.c
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@@ -123,11 +123,14 @@ static inline void clear_ipi(void)
clint_clear_ipi(cpuid_to_hartid_map(smp_processor_id()));
}
void riscv_software_interrupt(void)
void handle_IPI(struct pt_regs *regs)
{
struct pt_regs *old_regs = set_irq_regs(regs);
unsigned long *pending_ipis = &ipi_data[smp_processor_id()].bits;
unsigned long *stats = ipi_data[smp_processor_id()].stats;
irq_enter();
clear_ipi();
while (true) {
@@ -138,7 +141,7 @@ void riscv_software_interrupt(void)
ops = xchg(pending_ipis, 0);
if (ops == 0)
return;
goto done;
if (ops & (1 << IPI_RESCHEDULE)) {
stats[IPI_RESCHEDULE]++;
@@ -160,6 +163,10 @@ void riscv_software_interrupt(void)
/* Order data access and bit testing. */
mb();
}
done:
irq_exit();
set_irq_regs(old_regs);
}
static const char * const ipi_names[] = {