linux-kernel - [PATCH v2 1/9] arm64/sysreg: Add definitions for immediate versions of MSR ALLINT

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Message-ID: <20240411064858.3232574-2-liaochang1@huawei.com>
Date: Thu, 11 Apr 2024 06:48:50 +0000
From: Liao Chang <liaochang1@...wei.com>
To: <catalin.marinas@....com>, <will@...nel.org>, <maz@...nel.org>,
	<oliver.upton@...ux.dev>, <james.morse@....com>, <suzuki.poulose@....com>,
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CC: <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<kvmarm@...ts.linux.dev>
Subject: [PATCH v2 1/9] arm64/sysreg: Add definitions for immediate versions of MSR ALLINT

From: Mark Brown <broonie@...nel.org>

Encodings are provided for ALLINT which allow setting of ALLINT.ALLINT
using an immediate rather than requiring that a register be loaded with
the value to write. Since these don't currently fit within the scheme we
have for sysreg generation add manual encodings like we currently do for
other similar registers such as SVCR.

Since it is required that these immediate versions be encoded with xzr
as the source register provide asm wrapper which ensure this is the
case.

Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Liao Chang <liaochang1@...wei.com>
---
 arch/arm64/include/asm/nmi.h    | 27 +++++++++++++++++++++++++++
 arch/arm64/include/asm/sysreg.h |  2 ++
 2 files changed, 29 insertions(+)
 create mode 100644 arch/arm64/include/asm/nmi.h

diff --git a/arch/arm64/include/asm/nmi.h b/arch/arm64/include/asm/nmi.h
new file mode 100644
index 000000000000..0c566c649485
--- /dev/null
+++ b/arch/arm64/include/asm/nmi.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2022 ARM Ltd.
+ */
+#ifndef __ASM_NMI_H
+#define __ASM_NMI_H
+
+#ifndef __ASSEMBLER__
+
+#include <linux/cpumask.h>
+
+extern bool arm64_supports_nmi(void);
+
+#endif /* !__ASSEMBLER__ */
+
+static __always_inline void _allint_clear(void)
+{
+	asm volatile(__msr_s(SYS_ALLINT_CLR, "xzr"));
+}
+
+static __always_inline void _allint_set(void)
+{
+	asm volatile(__msr_s(SYS_ALLINT_SET, "xzr"));
+}
+
+#endif
+
diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index 9e8999592f3a..b105773c57ca 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -167,6 +167,8 @@
  * System registers, organised loosely by encoding but grouped together
  * where the architected name contains an index. e.g. ID_MMFR<n>_EL1.
  */
+#define SYS_ALLINT_CLR			sys_reg(0, 1, 4, 0, 0)
+#define SYS_ALLINT_SET			sys_reg(0, 1, 4, 1, 0)
 #define SYS_SVCR_SMSTOP_SM_EL0		sys_reg(0, 3, 4, 2, 3)
 #define SYS_SVCR_SMSTART_SM_EL0		sys_reg(0, 3, 4, 3, 3)
 #define SYS_SVCR_SMSTOP_SMZA_EL0	sys_reg(0, 3, 4, 6, 3)
-- 
2.34.1