From: Anup Patel <anup.patel@wdc.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
Anup Patel <anup@brainfault.org>, Anup Patel <anup.patel@wdc.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org,
Atish Patra <atish.patra@wdc.com>,
Alistair Francis <Alistair.Francis@wdc.com>,
linux-riscv@lists.infradead.org, Christoph Hellwig <hch@lst.de>
Subject: [PATCH] RISC-V: Don't enable all interrupts in trap_init()
Date: Sun, 2 Feb 2020 16:32:02 +0530 [thread overview]
Message-ID: <20200202110202.124048-1-anup.patel@wdc.com> (raw)
Historically, we have been enabling all interrupts for each
HART in trap_init(). Ideally, we should only enable M-mode
interrupts for M-mode kernel and S-mode interrupts for S-mode
kernel in trap_init().
Currently, we get suprious S-mode interrupts on Kendryte K210
board running M-mode NO-MMU kernel because we are enabling all
interrupts in trap_init(). To fix this, we only enable software
and external interrupt in trap_init(). In future, trap_init()
will only enable software interrupt and PLIC driver will enable
external interrupt using CPU notifiers.
Cc: stable@vger.kernel.org
Fixes: 76d2a0493a17 ("RISC-V: Init and Halt Code)
Signed-off-by: Anup Patel <anup.patel@wdc.com>
---
arch/riscv/kernel/traps.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
index f4cad5163bf2..ffb3d94bf0cc 100644
--- a/arch/riscv/kernel/traps.c
+++ b/arch/riscv/kernel/traps.c
@@ -156,6 +156,6 @@ void __init trap_init(void)
csr_write(CSR_SCRATCH, 0);
/* Set the exception vector address */
csr_write(CSR_TVEC, &handle_exception);
- /* Enable all interrupts */
- csr_write(CSR_IE, -1);
+ /* Enable interrupts */
+ csr_write(CSR_IE, IE_SIE | IE_EIE);
}
--
2.17.1
next reply other threads:[~2020-02-02 11:06 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-02 11:02 Anup Patel [this message]
2020-02-02 11:48 ` [PATCH] RISC-V: Don't enable all interrupts in trap_init() Atish Patra
2020-02-18 18:36 ` Palmer Dabbelt
2020-02-19 3:28 ` Anup Patel
2020-03-05 18:51 ` Palmer Dabbelt
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