linux-kernel - [PATCH v6 11/24] arm64: daifflags: Include PMR in daifflags restore operations

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Date:   Mon, 12 Nov 2018 11:57:02 +0000
From:   Julien Thierry <julien.thierry@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, daniel.thompson@...aro.org,
        joel@...lfernandes.org, marc.zyngier@....com,
        christoffer.dall@....com, james.morse@....com,
        catalin.marinas@....com, will.deacon@....com,
        Julien Thierry <julien.thierry@....com>
Subject: [PATCH v6 11/24] arm64: daifflags: Include PMR in daifflags restore operations

The addition of PMR should not bypass the semantics of daifflags.

When DA_F are set, I bit is also set as no interrupts (even of higher
priority) is allowed.

When DA_F are cleared, I bit is cleared and interrupt enabling/disabling
goes through ICC_PMR_EL1.

Signed-off-by: Julien Thierry <julien.thierry@....com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will.deacon@....com>
Cc: James Morse <james.morse@....com>
---
 arch/arm64/include/asm/daifflags.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h
index 546bc39..31936b3 100644
--- a/arch/arm64/include/asm/daifflags.h
+++ b/arch/arm64/include/asm/daifflags.h
@@ -18,8 +18,14 @@
 
 #include <linux/irqflags.h>
 
-#define DAIF_PROCCTX		0
-#define DAIF_PROCCTX_NOIRQ	PSR_I_BIT
+#include <asm/cpufeature.h>
+
+#define DAIF_PROCCTX	MAKE_ARCH_FLAGS(0, GIC_PRIO_IRQON)
+
+#define DAIF_PROCCTX_NOIRQ						\
+	(system_supports_irq_prio_masking() ?				\
+		MAKE_ARCH_FLAGS(0, GIC_PRIO_IRQOFF) :			\
+		MAKE_ARCH_FLAGS(PSR_I_BIT, GIC_PRIO_IRQON))
 
 /* mask/save/unmask/restore all exceptions, including interrupts. */
 static inline void local_daif_mask(void)
-- 
1.9.1