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From: Thomas Gleixner <tglx@linutronix.de>
To: Marc Zyngier <maz@kernel.org>
Cc: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>,
	linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
	anna-maria@linutronix.de, shawnguo@kernel.org,
	s.hauer@pengutronix.de, festevam@gmail.com, bhelgaas@google.com,
	rdunlap@infradead.org, vidyas@nvidia.com,
	ilpo.jarvinen@linux.intel.com, apatel@ventanamicro.com,
	kevin.tian@intel.com, nipun.gupta@amd.com, den@valinux.co.jp,
	andrew@lunn.ch, gregory.clement@bootlin.com,
	sebastian.hesselbarth@gmail.com, gregkh@linuxfoundation.org,
	rafael@kernel.org, alex.williamson@redhat.com, will@kernel.org,
	lorenzo.pieralisi@arm.com, jgg@mellanox.com,
	ammarfaizi2@gnuweeb.org, robin.murphy@arm.com,
	lpieralisi@kernel.org, nm@ti.com, kristo@kernel.org,
	vkoul@kernel.org, okaya@kernel.org, agross@kernel.org,
	andersson@kernel.org, mark.rutland@arm.com,
	shameerali.kolothum.thodi@huawei.com, yuzenghui@huawei.com
Subject: Re: [PATCH v3 14/24] genirq/gic-v3-mbi: Remove unused wired MSI mechanics
Date: Tue, 25 Jun 2024 09:47:09 +0200	[thread overview]
Message-ID: <8734p179c2.ffs@tglx> (raw)
In-Reply-To: <86y16tiica.wl-maz@kernel.org>

On Tue, Jun 25 2024 at 08:37, Marc Zyngier wrote:
> On Mon, 17 Jun 2024 15:15:44 +0100,
> Thomas Gleixner <tglx@linutronix.de> wrote:
>> just install their special MSI write callback. I don't see any of those
>> setting up LEVEL triggered MSIs.
>> 
>> But then I'm might be missing something. If so can you point me please
>> to the usage instance which actually uses level signaled MSI?
>
> Good question. I'm pretty sure we had *something* at some point that
> used it, or that was planning on using it. I even vividly remember who
> was asking for this.
>
> But either that never really made it upstream, or they decided to move
> away from the kernel setting the MSI up and relied on firmware for
> that (which is fine as long as the device isn't behind an IOMMU).
>
> In the end, it begs the question of what we want to do with this
> feature.  I don't think it is a big deal to keep it around, but maybe
> we should plan for it to be retired. That's independent of this
> series, IMO.

I reworked the conversion so that it keeps it alive. We can remove it
later nevertheless :)

Thanks,

        tglx

  reply	other threads:[~2024-06-25  7:47 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-06-14 10:23 [PATCH v3 00/24] genirq, irqchip: Convert ARM MSI handling to Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 01/24] irqdomain: Fix formatting irq_find_matching_fwspec() kerneldoc comment Shivamurthy Shastri
2024-06-23 13:17   ` [tip: irq/msi] " tip-bot2 for Anna-Maria Behnsen
2024-06-14 10:23 ` [PATCH v3 02/24] irqchip/imx-mu-msi: Fix codingstyle in imx_mu_msi_domains_init() Shivamurthy Shastri
2024-06-23 13:17   ` [tip: irq/msi] " tip-bot2 for Anna-Maria Behnsen
2024-06-14 10:23 ` [PATCH v3 03/24] PCI/MSI: Provide MSI_FLAG_PCI_MSI_MASK_PARENT Shivamurthy Shastri
2024-06-14 16:09   ` Bjorn Helgaas
2024-06-17 12:52     ` Thomas Gleixner
2024-06-14 10:23 ` [PATCH v3 04/24] irqchip: Provide irq-msi-lib Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 05/24] irqchip/gic-v3-its: Provide MSI parent infrastructure Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 06/24] irqchip/irq-msi-lib: Prepare for PCI MSI/MSIX Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 07/24] irqchip/gic-v3-its: Provide MSI parent for PCI/MSI[-X] Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 08/24] irqchip/irq-msi-lib: Prepare for DEVICE MSI to replace platform MSI Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 09/24] irqchip/mbigen: Prepare for real per device MSI Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 10/24] irqchip/irq-msi-lib: Prepare for DOMAIN_BUS_WIRED_TO_MSI Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 11/24] irqchip/gic-v3-its: Switch platform MSI to MSI parent Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 12/24] irqchip/mbigen: Remove platform_msi_create_device_domain() fallback Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 13/24] genirq/msi: Remove platform_msi_create_device_domain() Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 14/24] genirq/gic-v3-mbi: Remove unused wired MSI mechanics Shivamurthy Shastri
2024-06-15 17:24   ` Marc Zyngier
2024-06-17 12:55     ` Thomas Gleixner
2024-06-17 13:03       ` Marc Zyngier
2024-06-17 14:02         ` Thomas Gleixner
2024-06-17 14:15           ` Thomas Gleixner
2024-06-21 14:04             ` Thomas Gleixner
2024-06-23 11:26               ` Thomas Gleixner
2024-06-25  7:37             ` Marc Zyngier
2024-06-25  7:47               ` Thomas Gleixner [this message]
2024-06-14 10:23 ` [PATCH v3 15/24] genirq/gic-v3-mbi: Switch to MSI parent Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 16/24] irqchip/gic-v2m: Switch to device MSI Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 17/24] irqchip/imx-mu-msi: Switch to MSI parent Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 18/24] irqchip/irq-mvebu-icu: Prepare for real per device MSI Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 19/24] irqchip/mvebu-gicp: Switch to MSI parent Shivamurthy Shastri
2024-06-14 10:23 ` [PATCH v3 20/24] irqchip/mvebu-odmi: Switch to parent MSI Shivamurthy Shastri
2024-06-14 10:24 ` [PATCH v3 21/24] irqchip/irq-mvebu-sei: Switch to MSI parent Shivamurthy Shastri
2024-06-14 10:24 ` [PATCH v3 22/24] irqchip/irq-mvebu-icu: Remove platform MSI leftovers Shivamurthy Shastri
2024-06-14 10:24 ` [PATCH v3 23/24] genirq/msi: " Shivamurthy Shastri
2024-06-14 10:24 ` [PATCH v3 24/24] genirq/msi: Move msi_device_data to core Shivamurthy Shastri

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