Thread (59 messages) 59 messages, 8 authors, 2018-10-03
STALE2808d
Revisions (7)
  1. v4 [diff vs current]
  2. v5 current
  3. v6 [diff vs current]
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  5. v8 [diff vs current]
  6. v9 [diff vs current]
  7. v10 [diff vs current]

[PATCH v5 16/27] arm64: daifflags: Include PMR in daifflags restore operations

From: Julien Thierry <hidden>
Date: 2018-08-28 15:52:29
Also in: lkml
Subsystem: arm64 port (aarch64 architecture), the rest · Maintainers: Catalin Marinas, Will Deacon, Linus Torvalds

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 <redacted>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <redacted>
Cc: James Morse <james.morse@arm.com>
---
 arch/arm64/include/asm/daifflags.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/include/asm/daifflags.h b/arch/arm64/include/asm/daifflags.h
index 8d91f22..ccd95e8 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/arch_gicv3.h>
+
+#define DAIF_PROCCTX	MAKE_ARCH_FLAGS(0, ICC_PMR_EL1_UNMASKED)
+
+#define DAIF_PROCCTX_NOIRQ						\
+	(gic_prio_masking_enabled() ?					\
+		MAKE_ARCH_FLAGS(0, ICC_PMR_EL1_MASKED) :		\
+		MAKE_ARCH_FLAGS(PSR_I_BIT, ICC_PMR_EL1_UNMASKED))
 
 /* mask/save/unmask/restore all exceptions, including interrupts. */
 static inline void local_daif_mask(void)
@@ -51,6 +57,10 @@ static inline void local_daif_unmask(void)
 		:
 		:
 		: "memory");
+
+	/* Unmask IRQs in PMR if needed */
+	if (gic_prio_masking_enabled())
+		arch_local_irq_enable();
 }
 
 static inline void local_daif_restore(unsigned long flags)
-- 
1.9.1
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