Re: [PATCH v4 02/26] arm64: cpufeature: Add cpufeature for IRQ priority masking

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From: Julien Thierry <julien.thierry@arm.com>
To: Suzuki K Poulose <Suzuki.Poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, daniel.thompson@linaro.org,
	joel@joelfernandes.org, marc.zyngier@arm.com,
	mark.rutland@arm.com, christoffer.dall@arm.com,
	james.morse@arm.com, catalin.marinas@arm.com,
	will.deacon@arm.com
Subject: Re: [PATCH v4 02/26] arm64: cpufeature: Add cpufeature for IRQ priority masking
Date: Fri, 25 May 2018 11:17:45 +0100	[thread overview]
Message-ID: <b0673d7e-9a1e-7dcb-5322-c05fe0821349@arm.com> (raw)
In-Reply-To: <e44df12f-9868-ae94-4623-ec221d72d783@arm.com>

On 25/05/18 11:04, Suzuki K Poulose wrote:
> On 25/05/18 10:49, Julien Thierry wrote:
>> Add a cpufeature indicating whether a cpu supports masking interrupts
>> by priority.
> 
> How is this different from the SYSREG_GIC_CPUIF cap ? Is it just
> the description ?

More or less.

It is just to have an easier condition in the rest of the series. 
Basically the PRIO masking feature is enabled if we have a GICv3 CPUIF 
working *and* the option was selected at build time. Before this meant 
that I was checking for the GIC_CPUIF cap inside #ifdefs (and putting 
alternatives depending on that inside #ifdefs as well).

Having this as a separate feature feels easier to manage in the code. It 
also makes it clearer at boot time that the kernel will be using irq 
priorities (although I admit it was not the initial intention):

[    0.000000] CPU features: detected: IRQ priority masking

But yes that new feature will be detected only if SYSREG_GIC_CPUIF gets 
detected as well.

Cheers,

-- 
Julien Thierry

next prev parent reply	other threads:[~2018-05-25 10:17 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-25  9:49 [PATCH v4 00/26] arm64: provide pseudo NMI with GICv3 Julien Thierry
2018-05-25  9:49 ` [PATCH v4 01/26] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Julien Thierry
2018-05-25  9:49 ` [PATCH v4 02/26] arm64: cpufeature: Add cpufeature for IRQ priority masking Julien Thierry
2018-05-25 10:04   ` Suzuki K Poulose
2018-05-25 10:17     ` Julien Thierry [this message]
2018-05-25 10:36       ` Suzuki K Poulose
2018-05-25 10:39         ` Julien Thierry
2018-05-25 10:41           ` Suzuki K Poulose
2018-05-25 10:48             ` Julien Thierry
2018-06-12 13:46               ` Julien Thierry
2018-06-15 10:16                 ` Suzuki K Poulose
2018-05-25  9:49 ` [PATCH v4 03/26] arm64: cpufeature: Use alternatives for VHE cpu_enable Julien Thierry
2018-05-25  9:49 ` [PATCH v4 04/26] arm64: alternative: Apply alternatives early in boot process Julien Thierry
2018-05-25 10:00   ` Suzuki K Poulose
2018-05-25 10:25     ` Julien Thierry
2018-05-25  9:49 ` [PATCH v4 05/26] irqchip/gic: Unify GIC priority definitions Julien Thierry
2018-05-25  9:49 ` [PATCH v4 06/26] irqchip/gic: Lower priority of GIC interrupts Julien Thierry
2018-05-25  9:49 ` [PATCH v4 07/26] irqchip/gic-v3: Remove acknowledge loop Julien Thierry
2018-05-25  9:49 ` [PATCH v4 08/26] arm64: daifflags: Use irqflags functions for daifflags Julien Thierry
2018-05-25  9:49 ` [PATCH v4 09/26] arm64: Use daifflag_restore after bp_hardening Julien Thierry
2018-05-25  9:49 ` [PATCH v4 10/26] arm64: Delay daif masking for user return Julien Thierry
2018-05-25  9:49 ` [PATCH v4 11/26] arm64: Make PMR part of task context Julien Thierry
2018-05-25  9:49 ` [PATCH v4 12/26] arm64: Unmask PMR before going idle Julien Thierry
2018-05-25  9:49 ` [PATCH v4 13/26] arm/arm64: gic-v3: Add helper functions to manage IRQ priorities Julien Thierry
2018-05-25  9:49 ` [PATCH v4 14/26] arm64: kvm: Unmask PMR before entering guest Julien Thierry
2018-05-25  9:49 ` [PATCH v4 15/26] arm64: irqflags: Use ICC_PMR_EL1 for interrupt masking Julien Thierry
2018-05-25  9:49 ` [PATCH v4 16/26] arm64: daifflags: Include PMR in daifflags restore operations Julien Thierry
2018-05-25  9:49 ` [PATCH v4 17/26] irqchip/gic-v3: Factor group0 detection into functions Julien Thierry
2018-05-25  9:49 ` [PATCH v4 18/26] irqchip/gic-v3: Do not overwrite PMR value Julien Thierry
2018-05-25  9:49 ` [PATCH v4 19/26] irqchip/gic-v3: Switch to PMR masking after IRQ acknowledge Julien Thierry
2018-05-25  9:49 ` [PATCH v4 20/26] arm64: Switch to PMR masking when starting CPUs Julien Thierry
2018-05-25  9:49 ` [PATCH v4 21/26] arm64: Add build option for IRQ masking via priority Julien Thierry
2018-05-25  9:49 ` [PATCH v4 22/26] arm64: Detect current view of GIC priorities Julien Thierry
2018-05-25  9:49 ` [PATCH v4 23/26] irqchip/gic: Add functions to access irq priorities Julien Thierry
2018-05-25  9:49 ` [PATCH v4 24/26] irqchip/gic-v3: Add base support for pseudo-NMI Julien Thierry
2018-06-13 11:14   ` Julien Thierry
2018-05-25  9:49 ` [PATCH v4 25/26] irqchip/gic-v3: Provide NMI handlers Julien Thierry
2018-05-25  9:49 ` [PATCH v4 26/26] irqchip/gic-v3: Allow interrupts to be set as pseudo-NMI Julien Thierry
2018-06-13 11:07   ` Julien Thierry
2018-05-25 10:16 ` [PATCH v4 00/26] arm64: provide pseudo NMI with GICv3 Daniel Thompson
2018-05-25 10:40   ` Julien Thierry
2018-05-25 13:42     ` Julien Thierry
2018-07-20 15:09 ` Daniel Thompson
2018-07-23 12:39   ` Julien Thierry

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