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From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>
Subject: [PATCH 04/11] powerpc/64s: micro-optimise __hard_irq_enable() for mtmsrd L=1 support
Date: Sat,  5 May 2018 03:19:28 +1000	[thread overview]
Message-ID: <20180504171935.25410-5-npiggin@gmail.com> (raw)
In-Reply-To: <20180504171935.25410-1-npiggin@gmail.com>

Book3S minimum supported ISA version now requires mtmsrd L=1. This
instruction does not require bits other than RI and EE to be supplied,
so __hard_irq_enable() and __hard_irq_disable() does not have to read
the kernel_msr from paca.

Interrupt entry code already relies on L=1 support.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 arch/powerpc/include/asm/hw_irq.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/include/asm/hw_irq.h b/arch/powerpc/include/asm/hw_irq.h
index 8004d7887ff6..fbc2d83808aa 100644
--- a/arch/powerpc/include/asm/hw_irq.h
+++ b/arch/powerpc/include/asm/hw_irq.h
@@ -228,8 +228,8 @@ static inline bool arch_irqs_disabled(void)
 #define __hard_irq_enable()	asm volatile("wrteei 1" : : : "memory")
 #define __hard_irq_disable()	asm volatile("wrteei 0" : : : "memory")
 #else
-#define __hard_irq_enable()	__mtmsrd(local_paca->kernel_msr | MSR_EE, 1)
-#define __hard_irq_disable()	__mtmsrd(local_paca->kernel_msr, 1)
+#define __hard_irq_enable()	__mtmsrd(MSR_EE|MSR_RI, 1)
+#define __hard_irq_disable()	__mtmsrd(MSR_RI, 1)
 #endif
 
 #define hard_irq_disable()	do {					\
-- 
2.17.0

  parent reply	other threads:[~2018-05-04 17:20 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-04 17:19 [PATCH 00/11] assortment of timer, watchdog, interrupt Nicholas Piggin
2018-05-04 17:19 ` [PATCH 01/11] powerpc/64: irq_work avoid interrupt when called with hardware irqs enabled Nicholas Piggin
2018-06-04 14:10   ` [01/11] " Michael Ellerman
2018-05-04 17:19 ` [PATCH 02/11] powerpc/pseries: put cede MSR[EE] check under IRQ_SOFT_MASK_DEBUG Nicholas Piggin
2018-05-04 17:19 ` [PATCH 03/11] powerpc/64s: make PACA_IRQ_HARD_DIS track MSR[EE] closely Nicholas Piggin
2018-05-04 17:19 ` Nicholas Piggin [this message]
2018-05-04 17:19 ` [PATCH 05/11] powerpc/64: remove start_tb and accum_tb from thread_struct Nicholas Piggin
2018-05-04 17:19 ` [PATCH 06/11] powerpc/pseries: lparcfg calculate PURR on demand Nicholas Piggin
2018-05-04 17:19 ` [PATCH 07/11] powerpc: generic clockevents broadcast receiver call tick_receive_broadcast Nicholas Piggin
2018-05-05 14:38   ` kbuild test robot
2018-05-04 17:19 ` [PATCH 08/11] powerpc: allow soft-NMI watchdog to cover timer interrupts with large decrementers Nicholas Piggin
2018-05-04 17:19 ` [PATCH 09/11] powerpc: move timer broadcast code under GENERIC_CLOCKEVENTS_BROADCAST ifdef Nicholas Piggin
2018-05-04 17:19 ` [PATCH 10/11] powerpc: move a stray NMI IPI case under NMI_IPI ifdef Nicholas Piggin
2018-05-04 17:19 ` [PATCH 11/11] powerpc/time: account broadcast timer event interrupts separately Nicholas Piggin

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