From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67708C4332F for ; Fri, 11 Nov 2022 14:00:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234261AbiKKOA4 (ORCPT ); Fri, 11 Nov 2022 09:00:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42262 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230270AbiKKOAa (ORCPT ); Fri, 11 Nov 2022 09:00:30 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFCCE56EDD; Fri, 11 Nov 2022 05:56:45 -0800 (PST) Message-ID: <20221111132706.276545278@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1668175004; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=zA5ha748LKhDmb5FPzI8a0g9w0FaiptQdqB8uQ3jTXw=; b=EbvSbUXW9nFHqG2WDwQcBgXL97thkoo4raFmOln8yVqrphIoC0l+9hZHMP5m9yUF/GECc4 KewKET9LzTLaaXlMfLo6KTDhrcxx4M5+mX+9+vH3yYqyIGJ/ZqTeq2DmusSXPt1Z68YxgY gm2HvOi0toYYKQZQ96JGxXlsPwFT9gZusZx6nLe+KC+CcnkaRsxW5Uc9XoWBoK0wRPgpYj J9QRr2LKPx5Q804UiQ1NffH88HSjiEsfcQn5mEmtNTxXFAgI6qhyQc/nQJlD73AOgazk1w bu8MzrlM0qKn3suCr6/sTsQSpD4UC91v1Vt+zPorCA7ZbBpnJ9Sh7zdcWOaIyA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1668175004; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: references:references; bh=zA5ha748LKhDmb5FPzI8a0g9w0FaiptQdqB8uQ3jTXw=; b=T9IEE38gSYKi57w85Y2z1rWZQqe1G0LxfHLdyp2W+2FRPXDVlQDagn6EzBEVSfUZrqqmvL KkP6szVnXinU4rAg== From: Thomas Gleixner To: LKML Cc: x86@kernel.org, Joerg Roedel , Will Deacon , linux-pci@vger.kernel.org, Bjorn Helgaas , Lorenzo Pieralisi , Marc Zyngier , Greg Kroah-Hartman , Jason Gunthorpe , Dave Jiang , Alex Williamson , Kevin Tian , Dan Williams , Logan Gunthorpe , Ashok Raj , Jon Mason , Allen Hubbe , "Ahmed S. Darwish" , Reinette Chatre Subject: [patch 04/20] genirq/irqdomain: Provide IRQ_DOMAIN_FLAG_MSI_PARENT References: <20221111131813.914374272@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Date: Fri, 11 Nov 2022 14:56:43 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org The new PCI/IMS (Interrupt Message Store) functionality is allowing hardware vendors to provide implementation specific storage for the MSI messages. This can be device memory and also host/guest memory, e.g. in queue memory which is shared with the hardware. This requires device specific MSI interrupt domains, which cannot be achived by expanding the existing PCI/MSI interrupt domain concept which is a global interrupt domain shared by all PCI devices on a particular (IOMMU) segment: |--- device 1 [Vector]---[Remapping]---[PCI/MSI]--|... |--- device N This works because the PCI/MSI[-X] space is uniform, but falls apart with PCI/IMS which is implementation defined and must be available along with PCI/MSI[-X] on the same device. To support PCI/MSI[-X] plus PCI/IMS on the same device it is required to rework the PCI/MSI interrupt domain hierarchy concept in the following way: |--- [PCI/MSI] device 1 [Vector]---[Remapping]---|... |--- [PCI/MSI] device N That allows in the next step to create multiple interrupt domains per device: |--- [PCI/MSI] device 1 |--- [PCI/IMS] device 1 [Vector]---[Remapping]---|... |--- [PCI/MSI] device N |--- [PCI/IMS] device N So the domain which previously created the global PCI/MSI domain must now act as parent domain for the per device domains. The hierarchy depth is the same as before, but the PCI/MSI domains are then device specific and not longer global. Provide IRQ_DOMAIN_FLAG_MSI_PARENT, which allows to identify these parent domains, along with helpers to query it. Signed-off-by: Thomas Gleixner --- include/linux/irqdomain.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -189,6 +189,9 @@ enum { /* Irq domain doesn't translate anything */ IRQ_DOMAIN_FLAG_NO_MAP = (1 << 6), + /* Irq domain is a MSI parent domain */ + IRQ_DOMAIN_FLAG_MSI_PARENT = (1 << 8), + /* * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved * for implementation specific purposes and ignored by the @@ -551,6 +554,11 @@ static inline bool irq_domain_is_msi_rem extern bool irq_domain_hierarchical_is_msi_remap(struct irq_domain *domain); +static inline bool irq_domain_is_msi_parent(struct irq_domain *domain) +{ + return domain->flags & IRQ_DOMAIN_FLAG_MSI_PARENT; +} + #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ static inline int irq_domain_alloc_irqs(struct irq_domain *domain, unsigned int nr_irqs, int node, void *arg) @@ -596,6 +604,12 @@ irq_domain_hierarchical_is_msi_remap(str { return false; } + +static inline bool irq_domain_is_msi_parent(struct irq_domain *domain) +{ + return false; +} + #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */ #else /* CONFIG_IRQ_DOMAIN */