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irqchip/sifive-plic: Setup cpuhp once after boot CPU handler is present 

For multiple PLIC instances, the plic_init() is called once for each
PLIC instance. Due to this we have two issues:
1. cpuhp_setup_state() is called multiple times
2. plic_starting_cpu() can crash for boot CPU if cpuhp_setup_state()
   is called before boot CPU PLIC handler is available.

Address both issues by only initializing the HP notifiers when
the boot CPU setup is complete.

Fixes: f1ad1133b1 ("irqchip/sifive-plic: Add support for multiple PLICs")
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20200518091441.94843-3-anup.patel@wdc.com
This commit is contained in:
Anup Patel 2020-05-18 14:44:40 +05:30 committed by Marc Zyngier
parent 2458ed31e9
commit 2234ae846c
1 changed files with 12 additions and 2 deletions
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12
drivers/irqchip/irq-sifive-plic.c
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@ -76,6 +76,7 @@ struct plic_handler {
void __iomem *enable_base;
struct plic_priv *priv;
};
static bool plic_cpuhp_setup_done;
static DEFINE_PER_CPU(struct plic_handler, plic_handlers);
static inline void plic_toggle(struct plic_handler *handler,
@ -285,6 +286,7 @@ static int __init plic_init(struct device_node *node,
int error = 0, nr_contexts, nr_handlers = 0, i;
u32 nr_irqs;
struct plic_priv *priv;
struct plic_handler *handler;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
@ -313,7 +315,6 @@ static int __init plic_init(struct device_node *node,
for (i = 0; i < nr_contexts; i++) {
struct of_phandle_args parent;
struct plic_handler *handler;
irq_hw_number_t hwirq;
int cpu, hartid;
@ -367,9 +368,18 @@ done:
nr_handlers++;
}
/*
* We can have multiple PLIC instances so setup cpuhp state only
* when context handler for current/boot CPU is present.
*/
handler = this_cpu_ptr(&plic_handlers);
if (handler->present && !plic_cpuhp_setup_done) {
cpuhp_setup_state(CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
"irqchip/sifive/plic:starting",
plic_starting_cpu, plic_dying_cpu);
plic_cpuhp_setup_done = true;
}
pr_info("mapped %d interrupts with %d handlers for %d contexts.\n",
nr_irqs, nr_handlers, nr_contexts);
set_handle_irq(plic_handle_irq);