From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 935F928A707; Thu, 3 Jul 2025 17:28:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751563683; cv=none; b=OBhw60c+fGe2F0NnP+Kd6hu3DE6bfONyV9TuFDtah8KivbbQVMWnwivw1UIuQSRDBw6B4K75086xVGV9ueEWFgN2IJxMxeum7Wv3/hXF7Dly9o+aZNm6q1s+Y1z0qgrS52lJXDjBtcQD6Tz4lCSouFpWM3NbHQPM+o3OItCjhjA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751563683; c=relaxed/simple; bh=7DItQyd/iDiXcaQ1oEjOGACHtzfWw4WzefkYn8OTkwU=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=hnYtamYZ6Rom7VXsv5WnDz0aO7USCzhCLuy9BVHiNYsfezZnmKPRzRZYWzohmcVWylLtANiXHgBTNUjr3UzVrvUH6QnvPvV25W9EKu9RI2fC9UtVYPTP6qHU0Ei3t0b8n8pW7WlfWcbeieBfoc0bFrjaHu681/4dYkq8Z2c0vFk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H5ZftxTx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="H5ZftxTx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5D73C4CEE3; Thu, 3 Jul 2025 17:28:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751563683; bh=7DItQyd/iDiXcaQ1oEjOGACHtzfWw4WzefkYn8OTkwU=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=H5ZftxTxWMfwxHZ+Pz3upY30k01iBoXdImqR+W/HMOoyYzD3f9V7nCF4lK/kiNDZk Iv/a4u5MSqT8IyVdWMKt/77YNztWhnMVkI9jWlOVKXqlAoxQpMObMsOsZNgt3mrBzd azBm0mh/xpH1TaR6W097mqBwLGUYZw+hfLFuqmy0dHTsMlEx3NfczGuOn3DQJBYmTs rmwl0RQjoupydZDcb1P37q76NVU3kFSi5kZwkrCDNvz1ducn1Tc2kKbXh0JmDQBSVI hQjavWGtQqoz8VzpB9ZusWsjtax/P5fIQ0C+xaskpPdNwILfdXtRyVYmu4AXYp6DXJ eN5ZOW0iYQJgA== Date: Thu, 3 Jul 2025 12:28:01 -0500 From: Bjorn Helgaas To: Nam Cao Cc: Marc Zyngier , Thomas Gleixner , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Karthikeyan Mitran , Hou Zhiqiang , Thomas Petazzoni , Pali =?utf-8?B?Um9ow6Fy?= , "K . Y . Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Joyce Ooi , Jim Quinlan , Nicolas Saenz Julienne , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Ryder Lee , Jianjun Wang , Marek Vasut , Yoshihiro Shimoda , Michal Simek , Daire McNamara , Nirmal Patel , Jonathan Derrick , Matthias Brugger , AngeloGioacchino Del Regno , linux-arm-kernel@lists.infradead.org, linux-hyperv@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH 00/16] PCI: MSI parent domain conversion Message-ID: <20250703172801.GA1934994@bhelgaas> Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, Jun 26, 2025 at 04:47:50PM +0200, Nam Cao wrote: > The initial implementation of PCI/MSI interrupt domains in the hierarchical > interrupt domain model used a shortcut by providing a global PCI/MSI > domain. > > This works because the PCI/MSI[X] hardware is standardized and uniform, but > it violates the basic design principle of hierarchical interrupt domains: > Each hardware block involved in the interrupt delivery chain should have a > separate interrupt domain. > > For PCI/MSI[X], the interrupt controller is per PCI device and not a global > made-up entity. > > Unsurprisingly, the shortcut turned out to have downsides as it does not > allow dynamic allocation of interrupt vectors after initialization and it > prevents supporting IMS on PCI. For further details, see: > > https://lore.kernel.org/lkml/20221111120501.026511281@linutronix.de/ > > The solution is implementing per device MSI domains, this means the > entities which provide global PCI/MSI domain so far have to implement MSI > parent domain functionality instead. > > This series converts the PCI controller drivers to implement MSI parent > domain. > > drivers/pci/Kconfig | 1 + > drivers/pci/controller/Kconfig | 11 + > drivers/pci/controller/dwc/Kconfig | 1 + > .../pci/controller/dwc/pcie-designware-host.c | 68 ++---- > drivers/pci/controller/dwc/pcie-designware.h | 1 - > drivers/pci/controller/mobiveil/Kconfig | 1 + > .../controller/mobiveil/pcie-mobiveil-host.c | 42 ++-- > .../pci/controller/mobiveil/pcie-mobiveil.h | 1 - > drivers/pci/controller/pci-aardvark.c | 59 ++--- > drivers/pci/controller/pci-hyperv.c | 98 ++++++-- > drivers/pci/controller/pcie-altera-msi.c | 44 ++-- > drivers/pci/controller/pcie-brcmstb.c | 44 ++-- > drivers/pci/controller/pcie-iproc-msi.c | 45 ++-- > drivers/pci/controller/pcie-mediatek-gen3.c | 67 ++--- > drivers/pci/controller/pcie-mediatek.c | 46 ++-- > drivers/pci/controller/pcie-rcar-host.c | 69 ++---- > drivers/pci/controller/pcie-xilinx-dma-pl.c | 48 ++-- > drivers/pci/controller/pcie-xilinx-nwl.c | 45 ++-- > drivers/pci/controller/pcie-xilinx.c | 55 +++-- > drivers/pci/controller/plda/Kconfig | 1 + > drivers/pci/controller/plda/pcie-plda-host.c | 44 ++-- > drivers/pci/controller/plda/pcie-plda.h | 1 - > drivers/pci/controller/vmd.c | 229 +++++++++--------- > 23 files changed, 504 insertions(+), 517 deletions(-) Looks good to me, thanks! I think Mani will probably pick this up. I might have included the specific "legacy MSI domain" thing you're replacing. It looks like you're replacing pci_msi_create_irq_domain() with msi_create_parent_irq_domain()? Minor merge conflict in pcie-mediatek-gen3.c with dcbea1c7e94e ("PCI: mediatek-gen3: Use dev_fwnode() for irq_domain_create_linear()"). No problem, we can easily fix that up. The "++i" in vmd.c stuck out to me since "i++" is so much more common. Acked-by: Bjorn Helgaas