From: Alan Mikhak <alan.mikhak@sifive.com>
To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
tglx@linutronix.de, jason@lakedaemon.net, maz@kernel.org,
palmer@sifive.com, paul.walmsley@sifive.com
Cc: Alan Mikhak <alan.mikhak@sifive.com>
Subject: [PATCH v2] irqchip: Skip contexts except supervisor in plic_init()
Date: Thu, 24 Oct 2019 09:11:43 -0700 [thread overview]
Message-ID: <1571933503-21504-1-git-send-email-alan.mikhak@sifive.com> (raw)
From: Alan Mikhak <alan.mikhak@sifive.com>
Modify plic_init() to skip .dts interrupt contexts other
than supervisor external interrupt.
The .dts entry for plic may specify multiple interrupt contexts.
For example, it may assign two entries IRQ_M_EXT and IRQ_S_EXT,
in that order, to the same interrupt controller. This patch
modifies plic_init() to skip the IRQ_M_EXT context since
IRQ_S_EXT is currently the only supported context.
If IRQ_M_EXT is not skipped, plic_init() will report "handler
already present for context" when it comes across the IRQ_S_EXT
context in the next iteration of its loop.
Without this patch, .dts would have to be edited to replace the
value of IRQ_M_EXT with -1 for it to be skipped.
Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Acked-by: Paul Walmsley <paul.walmsley@sifive.com> # arch/riscv
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
drivers/irqchip/irq-sifive-plic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index c72c036aea76..5f2a773d5669 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -251,8 +251,8 @@ static int __init plic_init(struct device_node *node,
continue;
}
- /* skip context holes */
- if (parent.args[0] == -1)
+ /* skip contexts other than supervisor external interrupt */
+ if (parent.args[0] != IRQ_S_EXT)
continue;
hartid = plic_find_hart_id(parent.np);
--
2.7.4
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reply other threads:[~2019-10-24 16:12 UTC|newest]
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