[PATCH AUTOSEL 5.10 16/45] riscv: Enable interrupts during syscalls with M-Mode

[Sasha Levin]

From: Damien Le Moal <damien.lemoal at wdc.com>

[ Upstream commit 643437b996bac9267785e0bd528332e2d5811067 ]

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 at wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt at google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt at google.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 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 524d918f3601b..080eb8d78589d 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)
-- 
2.27.0