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hw/intc: ibex_plic: Honour source priorities

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This patch follows what commit aa4d30f6618dc "riscv: plic: Honour source
priorities" does and ensures that the highest priority interrupt will be
serviced first.

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: Jessica Clarke <jrtc27@jrtc27.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <a697ca8a31eff8eb18a88e09a28206063cf85d48.1595655188.git.alistair.francis@wdc.com>
This commit is contained in:
Alistair Francis 2020-07-24 22:34:45 -07:00
parent 224914069d
commit 01c41d15de
1 changed files with 10 additions and 5 deletions
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15
hw/intc/ibex_plic.c
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@ -57,6 +57,8 @@ static void ibex_plic_irqs_set_pending(IbexPlicState *s, int irq, bool level)
static bool ibex_plic_irqs_pending(IbexPlicState *s, uint32_t context)
{
int i;
uint32_t max_irq = 0;
uint32_t max_prio = s->threshold;
for (i = 0; i < s->pending_num; i++) {
uint32_t irq_num = ctz64(s->pending[i]) + (i * 32);
@ -66,14 +68,17 @@ static bool ibex_plic_irqs_pending(IbexPlicState *s, uint32_t context)
continue;
}
if (s->priority[irq_num] > s->threshold) {
if (!s->claim) {
s->claim = irq_num;
}
return true;
if (s->priority[irq_num] > max_prio) {
max_irq = irq_num;
max_prio = s->priority[irq_num];
}
}
if (max_irq) {
s->claim = max_irq;
return true;
}
return false;
}