From: Anup Patel <anup.patel@wdc.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
Marc Zyngier <maz@kernel.org>
Cc: Atish Patra <atish.patra@wdc.com>,
Alistair Francis <Alistair.Francis@wdc.com>,
Anup Patel <anup@brainfault.org>,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Anup Patel <anup.patel@wdc.com>,
stable@vger.kernel.org
Subject: [PATCH v2 2/3] irqchip/sifive-plic: Setup cpuhp once after boot CPU handler is present
Date: Mon, 18 May 2020 14:44:40 +0530 [thread overview]
Message-ID: <20200518091441.94843-3-anup.patel@wdc.com> (raw)
In-Reply-To: <20200518091441.94843-1-anup.patel@wdc.com>
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.
This patch fixes both above issues.
Fixes: f1ad1133b18f ("irqchip/sifive-plic: Add support for multiple PLICs")
Cc: stable@vger.kernel.org
Signed-off-by: Anup Patel <anup.patel@wdc.com>
---
drivers/irqchip/irq-sifive-plic.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 9f7f8ce88c00..6c54abf5cc5e 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -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 @@ static int __init plic_init(struct device_node *node,
nr_handlers++;
}
- cpuhp_setup_state(CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
+ /*
+ * 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);
--
2.25.1
next prev parent reply other threads:[~2020-05-18 9:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200518091441.94843-1-anup.patel@wdc.com>
2020-05-18 9:14 ` [PATCH v2 1/3] irqchip/sifive-plic: Set default irq affinity in plic_irqdomain_map() Anup Patel
2020-05-21 22:06 ` Palmer Dabbelt
2020-05-22 6:44 ` Anup Patel
2020-05-30 7:46 ` [tip: irq/core] " tip-bot2 for Anup Patel
2020-05-18 9:14 ` Anup Patel [this message]
2020-05-21 22:06 ` [PATCH v2 2/3] irqchip/sifive-plic: Setup cpuhp once after boot CPU handler is present Palmer Dabbelt
2020-05-22 6:46 ` Anup Patel
2020-05-30 7:46 ` [tip: irq/core] " tip-bot2 for Anup Patel
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