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From: Mark Rutland <mark.rutland@arm.com>
To: Joey Gouly <joey.gouly@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
	marcan@marcan.st, james.morse@arm.com, maz@kernel.org,
	tglx@linutronix.de, will@kernel.org, nd@arm.com
Subject: Re: [PATCH 8/8] arm64: irq: allow FIQs to be handled
Date: Fri, 19 Feb 2021 18:18:34 +0000	[thread overview]
Message-ID: <20210219181825.GA84857@C02TD0UTHF1T.local> (raw)
In-Reply-To: <20210219153725.GA43917@e124191.cambridge.arm.com>

On Fri, Feb 19, 2021 at 03:37:25PM +0000, Joey Gouly wrote:
> Hi Mark,
> 
> On Fri, Feb 19, 2021 at 11:39:04AM +0000, Mark Rutland wrote:
> > On contemporary platforms we don't use FIQ, and treat any stray FIQ as a
> > fatal event. However, some platforms have an interrupt controller wired
> > to FIQ, and need to handle FIQ as part of regular operation.
> > 
> 
> [...]
> 
> > diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
> > index 0474cca9f1a9..a8290bd87a49 100644
> > --- a/arch/arm64/kernel/entry.S
> > +++ b/arch/arm64/kernel/entry.S
> > @@ -586,23 +586,23 @@ SYM_CODE_START(vectors)
> >  
> >  	kernel_ventry	1, sync				// Synchronous EL1h
> >  	kernel_ventry	1, irq				// IRQ EL1h
> > -	kernel_ventry	1, fiq_invalid			// FIQ EL1h
> > +	kernel_ventry	1, fiq				// FIQ EL1h
> >  	kernel_ventry	1, error			// Error EL1h
> >  
> >  	kernel_ventry	0, sync				// Synchronous 64-bit EL0
> >  	kernel_ventry	0, irq				// IRQ 64-bit EL0
> > -	kernel_ventry	0, fiq_invalid			// FIQ 64-bit EL0
> > +	kernel_ventry	0, fiq				// FIQ 64-bit EL0
> >  	kernel_ventry	0, error			// Error 64-bit EL0
> >  
> >  #ifdef CONFIG_COMPAT
> >  	kernel_ventry	0, sync_compat, 32		// Synchronous 32-bit EL0
> >  	kernel_ventry	0, irq_compat, 32		// IRQ 32-bit EL0
> > -	kernel_ventry	0, fiq_invalid_compat, 32	// FIQ 32-bit EL0
> > +	kernel_ventry	0, fiq_compat, 32		// FIQ 32-bit EL0
> >  	kernel_ventry	0, error_compat, 32		// Error 32-bit EL0
> >  #else
> >  	kernel_ventry	0, sync_invalid, 32		// Synchronous 32-bit EL0
> >  	kernel_ventry	0, irq_invalid, 32		// IRQ 32-bit EL0
> > -	kernel_ventry	0, fiq_invalid, 32		// FIQ 32-bit EL0
> > +	kernel_ventry	0, fiq, 32			// FIQ 32-bit EL0
> >  	kernel_ventry	0, error_invalid, 32		// Error 32-bit EL0
> >  #endif
> >  SYM_CODE_END(vectors)
> 
> I believe you can now remove functions `el0_fiq_invalid` and `el0_fiq_invalid_compat`.
> `el1_fiq_invalid` is still used by Synchronous EL1t, so can't be removed.

Good spot; el0_fiq_invalid_compat can go. For the !CONFIG_COMPAT it was
wrong to move away from fiq_invalid as that vector should never
legimitately fire, so I'll revert back to fiq_invalid for that case and
match the rest of the !CONFIG_COMPAT AArch32 EL0 handlers.

Thanks,
Mark.

WARNING: multiple messages have this Message-ID (diff)
From: Mark Rutland <mark.rutland@arm.com>
To: Joey Gouly <joey.gouly@arm.com>
Cc: catalin.marinas@arm.com, marcan@marcan.st,
	linux-kernel@vger.kernel.org, james.morse@arm.com,
	maz@kernel.org, tglx@linutronix.de, nd@arm.com, will@kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 8/8] arm64: irq: allow FIQs to be handled
Date: Fri, 19 Feb 2021 18:18:34 +0000	[thread overview]
Message-ID: <20210219181825.GA84857@C02TD0UTHF1T.local> (raw)
In-Reply-To: <20210219153725.GA43917@e124191.cambridge.arm.com>

On Fri, Feb 19, 2021 at 03:37:25PM +0000, Joey Gouly wrote:
> Hi Mark,
> 
> On Fri, Feb 19, 2021 at 11:39:04AM +0000, Mark Rutland wrote:
> > On contemporary platforms we don't use FIQ, and treat any stray FIQ as a
> > fatal event. However, some platforms have an interrupt controller wired
> > to FIQ, and need to handle FIQ as part of regular operation.
> > 
> 
> [...]
> 
> > diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
> > index 0474cca9f1a9..a8290bd87a49 100644
> > --- a/arch/arm64/kernel/entry.S
> > +++ b/arch/arm64/kernel/entry.S
> > @@ -586,23 +586,23 @@ SYM_CODE_START(vectors)
> >  
> >  	kernel_ventry	1, sync				// Synchronous EL1h
> >  	kernel_ventry	1, irq				// IRQ EL1h
> > -	kernel_ventry	1, fiq_invalid			// FIQ EL1h
> > +	kernel_ventry	1, fiq				// FIQ EL1h
> >  	kernel_ventry	1, error			// Error EL1h
> >  
> >  	kernel_ventry	0, sync				// Synchronous 64-bit EL0
> >  	kernel_ventry	0, irq				// IRQ 64-bit EL0
> > -	kernel_ventry	0, fiq_invalid			// FIQ 64-bit EL0
> > +	kernel_ventry	0, fiq				// FIQ 64-bit EL0
> >  	kernel_ventry	0, error			// Error 64-bit EL0
> >  
> >  #ifdef CONFIG_COMPAT
> >  	kernel_ventry	0, sync_compat, 32		// Synchronous 32-bit EL0
> >  	kernel_ventry	0, irq_compat, 32		// IRQ 32-bit EL0
> > -	kernel_ventry	0, fiq_invalid_compat, 32	// FIQ 32-bit EL0
> > +	kernel_ventry	0, fiq_compat, 32		// FIQ 32-bit EL0
> >  	kernel_ventry	0, error_compat, 32		// Error 32-bit EL0
> >  #else
> >  	kernel_ventry	0, sync_invalid, 32		// Synchronous 32-bit EL0
> >  	kernel_ventry	0, irq_invalid, 32		// IRQ 32-bit EL0
> > -	kernel_ventry	0, fiq_invalid, 32		// FIQ 32-bit EL0
> > +	kernel_ventry	0, fiq, 32			// FIQ 32-bit EL0
> >  	kernel_ventry	0, error_invalid, 32		// Error 32-bit EL0
> >  #endif
> >  SYM_CODE_END(vectors)
> 
> I believe you can now remove functions `el0_fiq_invalid` and `el0_fiq_invalid_compat`.
> `el1_fiq_invalid` is still used by Synchronous EL1t, so can't be removed.

Good spot; el0_fiq_invalid_compat can go. For the !CONFIG_COMPAT it was
wrong to move away from fiq_invalid as that vector should never
legimitately fire, so I'll revert back to fiq_invalid for that case and
match the rest of the !CONFIG_COMPAT AArch32 EL0 handlers.

Thanks,
Mark.

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  reply	other threads:[~2021-02-19 18:20 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-19 11:38 [PATCH 0/8] arm64: Support FIQ controller registration Mark Rutland
2021-02-19 11:38 ` Mark Rutland
2021-02-19 11:38 ` [PATCH 1/8] ARM: ep93xx: Select GENERIC_IRQ_MULTI_HANDLER directly Mark Rutland
2021-02-19 11:38   ` Mark Rutland
2021-02-19 11:38 ` [PATCH 2/8] irqchip: Do not blindly select CONFIG_GENERIC_IRQ_MULTI_HANDLER Mark Rutland
2021-02-19 11:38   ` Mark Rutland
2021-02-19 11:38 ` [PATCH 3/8] genirq: Allow architectures to override set_handle_irq() fallback Mark Rutland
2021-02-19 11:38   ` Mark Rutland
2021-02-19 11:39 ` [PATCH 4/8] arm64: don't use GENERIC_IRQ_MULTI_HANDLER Mark Rutland
2021-02-19 11:39   ` Mark Rutland
2021-02-19 11:39 ` [PATCH 5/8] arm64: irq: add a default handle_irq panic function Mark Rutland
2021-02-19 11:39   ` Mark Rutland
2021-02-22  9:59   ` Mark Rutland
2021-02-22  9:59     ` Mark Rutland
2021-02-22 10:48     ` Marc Zyngier
2021-02-22 10:48       ` Marc Zyngier
2021-02-22 11:25       ` Mark Rutland
2021-02-22 11:25         ` Mark Rutland
2021-02-22 11:43         ` Marc Zyngier
2021-02-22 11:43           ` Marc Zyngier
2021-02-22 12:06           ` Mark Rutland
2021-02-22 12:06             ` Mark Rutland
2021-02-22 12:23             ` Marc Zyngier
2021-02-22 12:23               ` Marc Zyngier
2021-02-19 11:39 ` [PATCH 6/8] arm64: entry: factor irq triage logic into macros Mark Rutland
2021-02-19 11:39   ` Mark Rutland
2021-02-19 11:39 ` [PATCH 7/8] arm64: Always keep DAIF.[IF] in sync Mark Rutland
2021-02-19 11:39   ` Mark Rutland
2021-02-19 17:25   ` [PATCH 7/8 v1.5] " Hector Martin
2021-02-19 17:25     ` Hector Martin
2021-02-19 18:26     ` Mark Rutland
2021-02-19 18:26       ` Mark Rutland
2021-02-22 17:39       ` Hector Martin
2021-02-22 17:39         ` Hector Martin
2021-02-22 18:43         ` Mark Rutland
2021-02-22 18:43           ` Mark Rutland
2021-02-19 11:39 ` [PATCH 8/8] arm64: irq: allow FIQs to be handled Mark Rutland
2021-02-19 11:39   ` Mark Rutland
2021-02-19 15:37   ` Joey Gouly
2021-02-19 15:37     ` Joey Gouly
2021-02-19 18:18     ` Mark Rutland [this message]
2021-02-19 18:18       ` Mark Rutland
2021-02-19 15:41 ` [PATCH 0/8] arm64: Support FIQ controller registration Hector Martin
2021-02-19 15:41   ` Hector Martin
2021-02-19 16:13   ` Mark Rutland
2021-02-19 16:13     ` Mark Rutland
2021-02-19 18:10 ` Marc Zyngier
2021-02-19 18:10   ` Marc Zyngier
2021-02-24 14:06   ` Mark Rutland
2021-02-24 14:06     ` Mark Rutland
2021-02-24 14:32     ` Marc Zyngier
2021-02-24 14:32       ` Marc Zyngier

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