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charset="iso-8859-2" Content-ID: <132307AD6E5ADE45AC1C1C0242D9CD65@namprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: 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 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN7PR04MB8532.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: e3841db8-7723-4795-852e-08de6a1b08f4 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Feb 2026 09:42:27.9706 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 5y4pdyKrAbRJ0Qy/FXPcbhFDGNew0xfzLYYvV5lfUHY4RcrGngTf1Vo5BV8rj84xLNWIJYjBe57mupsLKLsQ0iAhSiC2Kzr2Ugs4tFDiqsE= X-MS-Exchange-Transport-CrossTenantHeadersStamped: DSVPR04MB9964 On Feb 10, 2026 / 19:12, Niklas Cassel wrote: > When using the nvmet-pci-epf EPF driver, and starting the EP before > starting a host with UEFI, the UEFI performs NVMe commands e.g. > Identify Controller, to get the name of the controller. >=20 > nvmet-pci-epf will post the CQE (completion queue entry) to the Admin > Completion Queue, and then raise an IRQ (using > dw_pcie_ep_raise_msi_irq()). >=20 > Once the host boots Linux, we will see a WARN_ON_ONCE() from > dw_pcie_ep_raise_msi_irq(), and then the booting of the host hangs, > because it never gets an IRQ when loading the nvme driver. >=20 > The reason is that the MSI target address used by UEFI and Linux might > be different, which will cause dw_pcie_ep_raise_msi_irq() to simply > return -EINVAL. >=20 > This was working before commit 8719c64e76bf ("PCI: dwc: ep: Cache MSI > outbound iATU mapping"), so this is a regression. >=20 > Also, remove the warning, as we cannot know if there are operations in > flight or not, so it seems wrong to print this warning unconditionally > at every boot when e.g. nvmet-pci-epf is used with a host with UEFI. >=20 > Fixes: 8719c64e76bf ("PCI: dwc: ep: Cache MSI outbound iATU mapping") > Signed-off-by: Niklas Cassel Niklas, thank you for the fix. I confirmed that this patch avoids the "WARN_ON_ONCE() from dw_pcie_ep_raise_msi_irq()" and the host hangs in my environment. Tested-by: Shin'ichiro Kawasaki =