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From: Damien Le Moal <damien.lemoal@wdc.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
	linux-riscv@lists.infradead.org, Rob Herring <robh+dt@kernel.org>,
	devicetree@vger.kernel.org, Stephen Boyd <sboyd@kernel.org>,
	linux-clk@vger.kernel.org,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-gpio@vger.kernel.org,
	Philipp Zabel <p.zabel@pengutronix.de>
Cc: Sean Anderson <seanga2@gmail.com>
Subject: [PATCH v4 03/21] riscv: Enable interrupts during syscalls with M-Mode
Date: Wed,  2 Dec 2020 12:24:42 +0900	[thread overview]
Message-ID: <20201202032500.206346-4-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20201202032500.206346-1-damien.lemoal@wdc.com>

When running is M-Mode (no MMU config), MPIE does not get set. This
results in all syscalls being executed with interrupts disabled as
handle_exception never sets SR_IE as it always sees SR_PIE being
cleared. Fix this by always force enabling interrupts in
handle_syscall when CONFIG_RISCV_M_MODE is enabled.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 arch/riscv/kernel/entry.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 524d918f3601..080eb8d78589 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -155,6 +155,15 @@ skip_context_tracking:
 	tail do_trap_unknown
 
 handle_syscall:
+#ifdef CONFIG_RISCV_M_MODE
+	/*
+	 * When running is M-Mode (no MMU config), MPIE does not get set.
+	 * As a result, we need to force enable interrupts here because
+	 * handle_exception did not do set SR_IE as it always sees SR_PIE
+	 * being cleared.
+	 */
+	csrs CSR_STATUS, SR_IE
+#endif
 #if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
 	/* Recover a0 - a7 for system calls */
 	REG_L a0, PT_A0(sp)
-- 
2.28.0


  parent reply	other threads:[~2020-12-02  3:26 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-02  3:24 [PATCH v4 00/21] RISC-V Kendryte K210 support improvements Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 01/21] riscv: Fix kernel time_init() Damien Le Moal
2020-12-05  5:41   ` Stephen Boyd
2020-12-02  3:24 ` [PATCH v4 02/21] riscv: Fix sifive serial driver Damien Le Moal
2020-12-02  3:24 ` Damien Le Moal [this message]
2020-12-02  3:24 ` [PATCH v4 04/21] riscv: Fix builtin DTB handling Damien Le Moal
2020-12-04 15:11   ` Geert Uytterhoeven
2020-12-02  3:24 ` [PATCH v4 05/21] riscv: Use vendor name for K210 SoC support Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 06/21] dt-bindings: Add Canaan vendor prefix Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 07/21] dt-binding: clock: Document canaan,k210-clk bindings Damien Le Moal
2020-12-05  5:46   ` Stephen Boyd
2020-12-02  3:24 ` [PATCH v4 08/21] dt-bindings: reset: Document canaan,k210-rst bindings Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 09/21] dt-bindings: pinctrl: Document canaan,k210-fpioa bindings Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 10/21] dt-binding: mfd: Document canaan,k210-sysctl bindings Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 11/21] riscv: Add Canaan Kendryte K210 clock driver Damien Le Moal
2020-12-05  6:19   ` Stephen Boyd
2020-12-05  7:43     ` Damien Le Moal
2020-12-05 13:43       ` Sean Anderson
2020-12-05 14:13         ` Damien Le Moal
     [not found]       ` <160736612827.1580929.7802371235304556600@swboyd.mtv.corp.google.com>
2020-12-08  7:48         ` Damien Le Moal
2020-12-07  3:50     ` Damien Le Moal
2020-12-07  8:43       ` Geert Uytterhoeven
2020-12-07  9:55         ` Damien Le Moal
2020-12-07 10:06           ` Geert Uytterhoeven
2020-12-07 10:14             ` Damien Le Moal
2020-12-07 22:58               ` Sean Anderson
2020-12-07 11:34             ` Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 12/21] riscv: Add Canaan Kendryte K210 FPIOA driver Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 13/21] riscv: Add Canaan Kendryte K210 reset controller Damien Le Moal
2020-12-04 10:49   ` Philipp Zabel
2020-12-04 11:16     ` Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 14/21] riscv: Update Canaan Kendryte K210 device tree Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 15/21] riscv: Add SiPeed MAIX BiT board " Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 16/21] riscv: Add SiPeed MAIX DOCK " Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 17/21] riscv: Add SiPeed MAIX GO " Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 18/21] riscv: Add SiPeed MAIXDUINO " Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 19/21] riscv: Add Kendryte KD233 " Damien Le Moal
2020-12-02  3:24 ` [PATCH v4 20/21] riscv: Update Canaan Kendryte K210 defconfig Damien Le Moal
2020-12-02  3:25 ` [PATCH v4 21/21] riscv: Add Canaan Kendryte K210 SD card defconfig Damien Le Moal

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