linux-kernel - [RFC PATCH v3 06/15] powerpc/irq: Add new helpers to play with MSR_EE and MSR

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Message-Id: <40bc753eaf6f82ce7c8dee219fa730bf00c0974d.1586196948.git.christophe.leroy@c-s.fr>
Date:   Mon,  6 Apr 2020 18:16:42 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, npiggin@...il.com,
        msuchanek@...e.de
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v3 06/15] powerpc/irq: Add new helpers to play with MSR_EE
 and MSR_RI on PPC32

In preparation of porting PPC32 to C syscall entry/exit,
add PPC32 version of following helpers:
	__hard_irq_enable()
	__hard_irq_disable()
	__hard_EE_RI_disable()
	__hard_RI_enable()

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/hw_irq.h | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index e69466867d5f..8c30a72262fd 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -330,6 +330,16 @@ static inline void arch_local_irq_disable(void)
 		mtmsr(mfmsr() & ~MSR_EE);
 }
 
+static inline void arch_local_recovery_disable(void)
+{
+	if (IS_ENABLED(CONFIG_BOOKE))
+		wrtee(0);
+	else if (IS_ENABLED(CONFIG_PPC_8xx))
+		wrtspr(SPRN_NRI);
+	else
+		mtmsr(mfmsr() & ~(MSR_EE | MSR_RI));
+}
+
 static inline void arch_local_irq_enable(void)
 {
 	if (IS_ENABLED(CONFIG_BOOKE))
@@ -352,6 +362,11 @@ static inline bool arch_irqs_disabled(void)
 
 #define hard_irq_disable()		arch_local_irq_disable()
 
+#define __hard_irq_enable()		arch_local_irq_enable()
+#define __hard_irq_disable()		arch_local_irq_disable()
+#define __hard_EE_RI_disable()		arch_local_recovery_disable()
+#define __hard_RI_enable()		arch_local_irq_disable()
+
 static inline bool arch_irq_disabled_regs(struct pt_regs *regs)
 {
 	return !(regs->msr & MSR_EE);
-- 
2.25.0