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irqchip/sifive-plic: set max threshold for ignored handlers

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When running in M-mode, the S-mode plic handlers are still listed in the
device tree.  Ignore them by setting the maximum threshold.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Christoph Hellwig 2019-09-03 11:32:20 +02:00 committed by Paul Walmsley
parent 95594cb40c
commit 9ce06497c2
1 changed files with 10 additions and 2 deletions
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12
drivers/irqchip/irq-sifive-plic.c
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@ -244,6 +244,7 @@ static int __init plic_init(struct device_node *node,
struct plic_handler *handler;
irq_hw_number_t hwirq;
int cpu, hartid;
u32 threshold = 0;
if (of_irq_parse_one(node, i, &parent)) {
pr_err("failed to parse parent for context %d.\n", i);
@ -266,10 +267,16 @@ static int __init plic_init(struct device_node *node,
continue;
}
/*
* When running in M-mode we need to ignore the S-mode handler.
* Here we assume it always comes later, but that might be a
* little fragile.
*/
handler = per_cpu_ptr(&plic_handlers, cpu);
if (handler->present) {
pr_warn("handler already present for context %d.\n", i);
continue;
threshold = 0xffffffff;
goto done;
}
handler->present = true;
@ -279,8 +286,9 @@ static int __init plic_init(struct device_node *node,
handler->enable_base =
plic_regs + ENABLE_BASE + i * ENABLE_PER_HART;
done:
/* priority must be > threshold to trigger an interrupt */
writel(0, handler->hart_base + CONTEXT_THRESHOLD);
writel(threshold, handler->hart_base + CONTEXT_THRESHOLD);
for (hwirq = 1; hwirq <= nr_irqs; hwirq++)
plic_toggle(handler, hwirq, 0);
nr_handlers++;