linux-kernel - Re: [PATCH v7 20/31] irqchip/gic-v5: Add GICv5 PPI support

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Message-ID: <aGaqWooC6Q_HYbDL@arm.com>
Date: Thu, 3 Jul 2025 17:05:46 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Lorenzo Pieralisi <lpieralisi@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Will Deacon <will@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sascha Bischoff <sascha.bischoff@....com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Timothy Hayes <timothy.hayes@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Peter Maydell <peter.maydell@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Jiri Slaby <jirislaby@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v7 20/31] irqchip/gic-v5: Add GICv5 PPI support

On Thu, Jul 03, 2025 at 12:25:10PM +0200, Lorenzo Pieralisi wrote:
> The GICv5 CPU interface implements support for PE-Private Peripheral
> Interrupts (PPI), that are handled (enabled/prioritized/delivered)
> entirely within the CPU interface hardware.
> 
> To enable PPI interrupts, implement the baseline GICv5 host kernel
> driver infrastructure required to handle interrupts on a GICv5 system.
> 
> Add the exception handling code path and definitions for GICv5
> instructions.
> 
> Add GICv5 PPI handling code as a specific IRQ domain to:
> 
> - Set-up PPI priority
> - Manage PPI configuration and state
> - Manage IRQ flow handler
> - IRQs allocation/free
> - Hook-up a PPI specific IRQchip to provide the relevant methods
> 
> PPI IRQ priority is chosen as the minimum allowed priority by the
> system design (after probing the number of priority bits implemented
> by the CPU interface).
> 
> Co-developed-by: Sascha Bischoff <sascha.bischoff@....com>
> Signed-off-by: Sascha Bischoff <sascha.bischoff@....com>
> Co-developed-by: Timothy Hayes <timothy.hayes@....com>
> Signed-off-by: Timothy Hayes <timothy.hayes@....com>
> Signed-off-by: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Reviewed-by: Marc Zyngier <maz@...nel.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Marc Zyngier <maz@...nel.org>

Acked-by: Catalin Marinas <catalin.marinas@....com>