From: Marc Zyngier <maz@kernel.org>
To: Frank Li <Frank.Li@nxp.com>
Cc: "Kishon Vijay Abraham I" <kishon@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Anup Patel" <apatel@ventanamicro.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Danilo Krummrich" <dakr@kernel.org>,
"Manivannan Sadhasivam" <manivannan.sadhasivam@linaro.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Arnd Bergmann" <arnd@arndb.de>, "Shuah Khan" <shuah@kernel.org>,
"Richard Zhu" <hongxing.zhu@nxp.com>,
"Lucas Stach" <l.stach@pengutronix.de>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Shawn Guo" <shawnguo@kernel.org>,
"Sascha Hauer" <s.hauer@pengutronix.de>,
"Pengutronix Kernel Team" <kernel@pengutronix.de>,
"Fabio Estevam" <festevam@gmail.com>,
"Krzysztof Kozlowski" <krzk+dt@kernel.org>,
"Conor Dooley" <conor+dt@kernel.org>,
"Niklas Cassel" <cassel@kernel.org>,
dlemoal@kernel.org, jdmason@kudzu.us,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
linux-kselftest@vger.kernel.org, imx@lists.linux.dev,
devicetree@vger.kernel.org
Subject: Re: [PATCH v15 02/15] irqdomain: Add IRQ_DOMAIN_FLAG_MSI_IMMUTABLE and irq_domain_is_msi_immutable()
Date: Sat, 01 Mar 2025 11:10:35 +0000 [thread overview]
Message-ID: <86plj1ovkk.wl-maz@kernel.org> (raw)
In-Reply-To: <20250211-ep-msi-v15-2-bcacc1f2b1a9@nxp.com>
On Tue, 11 Feb 2025 19:21:55 +0000,
Frank Li <Frank.Li@nxp.com> wrote:
>
> Add the flag IRQ_DOMAIN_FLAG_MSI_IMMUTABLE and the API function
> irq_domain_is_msi_immutable() to check if the MSI controller retains an
> immutable address/data pair during irq_set_affinity().
>
> Ensure compatibility with MSI users like PCIe Endpoint Doorbell, which
> require the address/data pair to remain unchanged after setup. Use this
> function to verify if the MSI controller is immutable.
Why is that a requirement? Why should a driver even care?
M.
--
Without deviation from the norm, progress is not possible.
next prev parent reply other threads:[~2025-03-01 11:10 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-02-11 19:21 [PATCH v15 00/15] PCI: EP: Add RC-to-EP doorbell with platform MSI controller Frank Li
2025-02-11 19:21 ` [PATCH v15 01/15] platform-msi: Add msi_remove_device_irq_domain() in platform_device_msi_free_irqs_all() Frank Li
2025-03-01 12:17 ` Marc Zyngier
2025-02-11 19:21 ` [PATCH v15 02/15] irqdomain: Add IRQ_DOMAIN_FLAG_MSI_IMMUTABLE and irq_domain_is_msi_immutable() Frank Li
2025-03-01 11:10 ` Marc Zyngier [this message]
2025-03-03 17:01 ` Frank Li
2025-02-11 19:21 ` [PATCH v15 03/15] irqchip/gic-v3-its: Set IRQ_DOMAIN_FLAG_MSI_IMMUTABLE for ITS Frank Li
2025-02-11 19:21 ` [PATCH v15 04/15] irqchip/gic-v3-its: Add support for device tree msi-map and msi-mask Frank Li
2025-03-01 11:37 ` Marc Zyngier
2025-03-03 16:52 ` Frank Li
2025-02-11 19:21 ` [PATCH v15 05/15] PCI: endpoint: Set ID and of_node for function driver Frank Li
2025-02-11 19:21 ` [PATCH v15 06/15] PCI: endpoint: Add RC-to-EP doorbell support using platform MSI controller Frank Li
2025-02-11 19:22 ` [PATCH v15 07/15] PCI: endpoint: pci-ep-msi: Add MSI address/data pair mutable check Frank Li
2025-03-01 11:44 ` Marc Zyngier
2025-03-03 16:27 ` Frank Li
2025-02-11 19:22 ` [PATCH v15 08/15] PCI: endpoint: Add pci_epf_align_inbound_addr() helper for address alignment Frank Li
2025-02-11 19:22 ` [PATCH v15 09/15] PCI: endpoint: pci-epf-test: Add doorbell test support Frank Li
2025-02-11 19:22 ` [PATCH v15 10/15] misc: pci_endpoint_test: Add doorbell test case Frank Li
2025-02-11 19:22 ` [PATCH v15 11/15] selftests: pci_endpoint: " Frank Li
2025-02-11 19:22 ` [PATCH v15 12/15] pci: imx6: Add helper function imx_pcie_add_lut_by_rid() Frank Li
2025-02-11 19:22 ` [PATCH v15 13/15] pci: imx6: Add LUT setting for MSI/IOMMU in Endpoint mode Frank Li
2025-02-11 19:22 ` [PATCH v15 14/15] arm64: dts: imx95: Add msi-map for pci-ep device Frank Li
2025-02-11 19:22 ` [PATCH v15 15/15] arm64: dts: imx95-19x19-evk: Add PCIe1 endpoint function overlay file Frank Li
2025-02-20 20:01 ` [PATCH v15 00/15] PCI: EP: Add RC-to-EP doorbell with platform MSI controller Frank Li
2025-02-20 20:42 ` Thomas Gleixner
2025-02-28 17:07 ` Frank Li
2025-03-01 12:02 ` Marc Zyngier
2025-03-01 18:09 ` Thomas Gleixner
2025-03-10 21:08 ` Frank Li
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