From patchwork Mon Nov 21 14:38:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 23838 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:adf:f944:0:0:0:0:0 with SMTP id q4csp1632804wrr; Mon, 21 Nov 2022 06:49:43 -0800 (PST) X-Google-Smtp-Source: AA0mqf6Ia4o1IYDIzpqi50aE2RJhqDt3q0Am9OmniTq5c0NDEfH/GXrfXrmbpmnbuFlzXqz2LkT8 X-Received: by 2002:a17:90a:4905:b0:212:fd8c:523a with SMTP id c5-20020a17090a490500b00212fd8c523amr20908959pjh.52.1669042182972; Mon, 21 Nov 2022 06:49:42 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1669042182; cv=none; d=google.com; s=arc-20160816; b=IEuI10bxi/xX1dW+ySHoVkhqPcfSKedoU228trgb9+ueH/PXCC3UGvB2TWcBVmRchy EXS0Ee/KMvkITWQwHT7PXOmy5jWQN6fHq4HxRnJ1S1Xm7wH3nUlyEehEjl4DeoAghpQK Klp+BbVe5LYf0VIqxwG8PnzV1/xa/FSj8JHCe/YlcebYJaXFHQ3QP4c0AZ8zG1aSin9s 1b32ur8qdBj5WjSkKsC+3MmU1K1/EOwzu/dtLshTZ5pC2lXmr/tCYF+bjYDH9L1zGsen IPMiQjciqhQXgsl4O9doFDx8MOh7gVzxcE5KlgMGKa+OLpP2o14DA0LrSEPnenmo7Ewh xEhw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:date:mime-version:references:subject:cc:to:from :dkim-signature:dkim-signature:message-id; bh=dPsIsUTlWmyEo9zstL3A7RgXpEoaaZrG8HYlS9a0uvQ=; b=GZXB6vzi460NeA9SONfsXaZY4jPmICsENP9Ez+jIcjPQgIrqxg2wZiT9MovEcNSHvE VcT8kBltau3rtKCqlBi4ElArqcqME5CxvQxxPRjtJhhLNpDOU9XA7KCLEp6xu6LCkMPt B51PrxNOv37WMdLOWQXryKxoAPMLG7c1l79Jdjeetrh7M7wp5jgnlcGNiRQ3pJAl80Yp N/U7lPRxSaU7U8H6qdruKHU4GD/f8JIbECVlvFJbfE5QGnmC+Utd6fIEyrr+GfUY14hB BP4s1xdCV4kVg/AQQJyPDmc6YeDf+3tYKSmfHDQIKNuTVoh+WrBdtVRo7drVjH5NY++/ I+jw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=JglSAlvk; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=RI0AvfYJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id w24-20020a17090a8a1800b00218b41176a9si2612227pjn.182.2022.11.21.06.49.26; Mon, 21 Nov 2022 06:49:42 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=JglSAlvk; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e header.b=RI0AvfYJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231687AbiKUOlP (ORCPT + 99 others); Mon, 21 Nov 2022 09:41:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49274 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231490AbiKUOjM (ORCPT ); Mon, 21 Nov 2022 09:39:12 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4A30FC80D7; Mon, 21 Nov 2022 06:38:22 -0800 (PST) Message-ID: <20221121091328.026206487@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1669041501; 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=dPsIsUTlWmyEo9zstL3A7RgXpEoaaZrG8HYlS9a0uvQ=; b=JglSAlvkoT93jFng1mXI8Xf/zFG0jlpT/jwqUNY06+Ky3te+1WrjDQoGWJJjH5fql9GSMj h5e2dRXcLcYqPR9CU8ZgD/UNomBHM5nzrk9tCnY+pjJLRzoLPXKrTJHDij9bprbOacnKl9 kTnDQ8lbyzgYbJODEX/8k+VoimWaN2Gpyk9mYnFF2HGiQ0ho3n2iIm2AF16EOaVEhWSpCw RG1lRoSLSdR/Zm6xlFvVOgAnWKkVS9wG9hJu4uIEyMFj7gdjS0GhsVj1QotpxUnPBD2UYT 6iNCFD4beXzfjJa6QseP+mD3THhlekOzpCqrPMDVewbeQp7bYoB5exkotgE4Ww== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1669041501; 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=dPsIsUTlWmyEo9zstL3A7RgXpEoaaZrG8HYlS9a0uvQ=; b=RI0AvfYJNxBkTf4pYxjTYuca9HBGvMWiBuMSms34qGjav9Ed8HKwEQChZqwifhcu+7/Pkb VEEYQ08eMz1bSTDw== 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 Subject: [patch V2 28/33] PCI/MSI: Provide IMS (Interrupt Message Store) support References: <20221121083657.157152924@linutronix.de> MIME-Version: 1.0 Date: Mon, 21 Nov 2022 15:38:21 +0100 (CET) X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1750117575790233849?= X-GMAIL-MSGID: =?utf-8?q?1750117575790233849?= IMS (Interrupt Message Store) is a new specification which allows implementation specific storage of MSI messages contrary to the strict standard specified MSI and MSI-X message stores. This requires new device specific interrupt domains to handle the implementation defined storage which can be an array in device memory or host/guest memory which is shared with hardware queues. Add a function to create IMS domains for PCI devices. IMS domains are using the new per device domain mechanism and are configured by the device driver via a template. IMS domains are created as secondary device domains so they work side on side with MSI[-X] on the same device. The IMS domains have a few constraints: - The index space is managed by the core code. Device memory based IMS provides a storage array with a fixed size which obviously requires an index. But there is no association between index and functionality so the core can randomly allocate an index in the array. Queue memory based IMS does not have the concept of an index as the storage is somewhere in memory. In that case the index is purely software based to keep track of the allocations. - There is no requirement for consecutive index ranges This is currently a limitation of the MSI core and can be implemented if there is a justified use case by changing the internal storage from xarray to maple_tree. For now it's single vector allocation. - The interrupt chip must provide the following callbacks: - irq_mask() - irq_unmask() - irq_write_msi_msg() - The interrupt chip must provide the following optional callbacks when the irq_mask(), irq_unmask() and irq_write_msi_msg() callbacks cannot operate directly on hardware, e.g. in the case that the interrupt message store is in queue memory: - irq_bus_lock() - irq_bus_unlock() These callbacks are invoked from preemptible task context and are allowed to sleep. In this case the mandatory callbacks above just store the information. The irq_bus_unlock() callback is supposed to make the change effective before returning. - Interrupt affinity setting is handled by the underlying parent interrupt domain and communicated to the IMS domain via irq_write_msi_msg(). IMS domains cannot have a irq_set_affinity() callback. That's a reasonable restriction similar to the PCI/MSI device domain implementations. The domain is automatically destroyed when the PCI device is removed. Signed-off-by: Thomas Gleixner --- drivers/pci/msi/irqdomain.c | 59 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/pci.h | 5 +++ 2 files changed, 64 insertions(+) --- a/drivers/pci/msi/irqdomain.c +++ b/drivers/pci/msi/irqdomain.c @@ -355,6 +355,65 @@ bool pci_msi_domain_supports(struct pci_ return (supported & feature_mask) == feature_mask; } +/** + * pci_create_ims_domain - Create a secondary IMS domain for a PCI device + * @pdev: The PCI device to operate on + * @template: The MSI info template which describes the domain + * @hwsize: The size of the hardware entry table or 0 if the domain + * is purely software managed + * @data: Optional pointer to domain specific data to be stored + * in msi_domain_info::data + * + * Return: True on success, false otherwise + * + * An IMS domain is expected to have the following constraints: + * - The index space is managed by the core code + * + * - There is no requirement for consecutive index ranges + * + * - The interrupt chip must provide the following callbacks: + * - irq_mask() + * - irq_unmask() + * - irq_write_msi_msg() + * + * - The interrupt chip must provide the following optional callbacks + * when the irq_mask(), irq_unmask() and irq_write_msi_msg() callbacks + * cannot operate directly on hardware, e.g. in the case that the + * interrupt message store is in queue memory: + * - irq_bus_lock() + * - irq_bus_unlock() + * + * These callbacks are invoked from preemptible task context and are + * allowed to sleep. In this case the mandatory callbacks above just + * store the information. The irq_bus_unlock() callback is supposed + * to make the change effective before returning. + * + * - Interrupt affinity setting is handled by the underlying parent + * interrupt domain and communicated to the IMS domain via + * irq_write_msi_msg(). + * + * The domain is automatically destroyed when the PCI device is removed. + */ +bool pci_create_ims_domain(struct pci_dev *pdev, const struct msi_domain_template *template, + unsigned int hwsize, void *data) +{ + struct irq_domain *domain = dev_get_msi_domain(&pdev->dev); + + if (!domain || !irq_domain_is_msi_parent(domain)) + return -ENOTSUPP; + + if (template->info.bus_token != DOMAIN_BUS_PCI_DEVICE_IMS || + !(template->info.flags & MSI_FLAG_ALLOC_SIMPLE_MSI_DESCS) || + !(template->info.flags & MSI_FLAG_FREE_MSI_DESCS) || + !template->chip.irq_mask || !template->chip.irq_unmask || + !template->chip.irq_write_msi_msg || template->chip.irq_set_affinity) + return -EINVAL; + + return msi_create_device_irq_domain(&pdev->dev, MSI_SECONDARY_DOMAIN, template, + hwsize, data, NULL); +} +EXPORT_SYMBOL_GPL(pci_create_ims_domain); + /* * Users of the generic MSI infrastructure expect a device to have a single ID, * so with DMA aliases we have to pick the least-worst compromise. Devices with --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2487,6 +2487,11 @@ static inline bool pci_is_thunderbolt_at void pci_uevent_ers(struct pci_dev *pdev, enum pci_ers_result err_type); #endif +struct msi_domain_template; + +bool pci_create_ims_domain(struct pci_dev *pdev, const struct msi_domain_template *template, + unsigned int hwsize, void *data); + #include #define pci_printk(level, pdev, fmt, arg...) \