From patchwork Mon Dec 6 22:27:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Gleixner X-Patchwork-Id: 12659975 X-Patchwork-Delegate: bhelgaas@google.com 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 43A9FC4332F for ; Mon, 6 Dec 2021 22:29:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237836AbhLFWdE (ORCPT ); Mon, 6 Dec 2021 17:33:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357466AbhLFWbw (ORCPT ); Mon, 6 Dec 2021 17:31:52 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 20304C0698C1; Mon, 6 Dec 2021 14:28:01 -0800 (PST) Message-ID: <20211206210225.046615302@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1638829679; 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=Llb+UkCn1EdRNyykmbxfFT74AdLeoQ5WEavNgQJIfNI=; b=m/otsXxhhIjzQusJ74eE8x4nGdLq11UjKe/1KMkqIM9y+rVLBafAimp/SstBo/tjgZZJjx jUOoA7IpkqUEML50sZTNQci0D7KnLV1MzjX0YjVCHj6Zz7zlYmxqGLCMvPnqkP+avoKD3g 7U5BFVjR9Hzh1o0t0RWyuvuXMyR9dQNDlfD1uB1foGmdMyJFhSAKleZ0J3XOTQuZnzQ4aP a9DnRcqa1Nin6HKz/IOBO4KLJ3RiPbywM+Ky2yqslP6pLupCe3J3mzyQtH5FhiTln6zTV8 KOeT5CnFn5EmRKWSfUdL/BHH823q5Ikmg75a9L5Qaag5v+7qt1RSQspcMYwX2g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1638829679; 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=Llb+UkCn1EdRNyykmbxfFT74AdLeoQ5WEavNgQJIfNI=; b=XpUaw5kpy0Mws2HZXd/IbELNsaWgjBLSWCLWagCfUU2JhlssyyFIUBSpX9FsWSY6dhwc6T ETc9kRzRw9IdjRCg== From: Thomas Gleixner To: LKML Cc: Bjorn Helgaas , Marc Zygnier , Alex Williamson , Kevin Tian , Jason Gunthorpe , Megha Dey , Ashok Raj , linux-pci@vger.kernel.org, Cedric Le Goater , Juergen Gross , Michael Ellerman , Paul Mackerras , Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, Thomas Bogendoerfer , linux-mips@vger.kernel.org, Kalle Valo , Greg Kroah-Hartman , sparclinux@vger.kernel.org, x86@kernel.org, xen-devel@lists.xenproject.org, ath11k@lists.infradead.org, Wei Liu , linux-hyperv@vger.kernel.org, Christian Borntraeger , Heiko Carstens Subject: [patch V2 22/23] genirq/msi: Handle PCI/MSI allocation fail in core code References: <20211206210147.872865823@linutronix.de> MIME-Version: 1.0 Date: Mon, 6 Dec 2021 23:27:59 +0100 (CET) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Get rid of yet another irqdomain callback and let the core code return the already available information of how many descriptors could be allocated. Signed-off-by: Thomas Gleixner Tested-by: Juergen Gross Reviewed-by: Jason Gunthorpe Reviewed-by: Greg Kroah-Hartman Acked-by: Bjorn Helgaas # PCI --- drivers/pci/msi/irqdomain.c | 13 ------------- include/linux/msi.h | 5 +---- kernel/irq/msi.c | 29 +++++++++++++++++++++++++---- 3 files changed, 26 insertions(+), 21 deletions(-) --- a/drivers/pci/msi/irqdomain.c +++ b/drivers/pci/msi/irqdomain.c @@ -95,16 +95,6 @@ static int pci_msi_domain_check_cap(stru return 0; } -static int pci_msi_domain_handle_error(struct irq_domain *domain, - struct msi_desc *desc, int error) -{ - /* Special handling to support __pci_enable_msi_range() */ - if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC) - return 1; - - return error; -} - static void pci_msi_domain_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc) { @@ -115,7 +105,6 @@ static void pci_msi_domain_set_desc(msi_ static struct msi_domain_ops pci_msi_domain_ops_default = { .set_desc = pci_msi_domain_set_desc, .msi_check = pci_msi_domain_check_cap, - .handle_error = pci_msi_domain_handle_error, }; static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info) @@ -129,8 +118,6 @@ static void pci_msi_domain_update_dom_op ops->set_desc = pci_msi_domain_set_desc; if (ops->msi_check == NULL) ops->msi_check = pci_msi_domain_check_cap; - if (ops->handle_error == NULL) - ops->handle_error = pci_msi_domain_handle_error; } } --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -286,7 +286,6 @@ struct msi_domain_info; * @msi_check: Callback for verification of the domain/info/dev data * @msi_prepare: Prepare the allocation of the interrupts in the domain * @set_desc: Set the msi descriptor for an interrupt - * @handle_error: Optional error handler if the allocation fails * @domain_alloc_irqs: Optional function to override the default allocation * function. * @domain_free_irqs: Optional function to override the default free @@ -295,7 +294,7 @@ struct msi_domain_info; * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying * irqdomain. * - * @msi_check, @msi_prepare, @handle_error and @set_desc are callbacks used by + * @msi_check, @msi_prepare and @set_desc are callbacks used by * msi_domain_alloc/free_irqs(). * * @domain_alloc_irqs, @domain_free_irqs can be used to override the @@ -332,8 +331,6 @@ struct msi_domain_ops { msi_alloc_info_t *arg); void (*set_desc)(msi_alloc_info_t *arg, struct msi_desc *desc); - int (*handle_error)(struct irq_domain *domain, - struct msi_desc *desc, int error); int (*domain_alloc_irqs)(struct irq_domain *domain, struct device *dev, int nvec); void (*domain_free_irqs)(struct irq_domain *domain, --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -538,6 +538,27 @@ static bool msi_check_reservation_mode(s return desc->pci.msi_attrib.is_msix || desc->pci.msi_attrib.can_mask; } +static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc, + int allocated) +{ + switch(domain->bus_token) { + case DOMAIN_BUS_PCI_MSI: + case DOMAIN_BUS_VMD_MSI: + if (IS_ENABLED(CONFIG_PCI_MSI)) + break; + fallthrough; + default: + return -ENOSPC; + } + + /* Let a failed PCI multi MSI allocation retry */ + if (desc->nvec_used > 1) + return 1; + + /* If there was a successful allocation let the caller know */ + return allocated ? allocated : -ENOSPC; +} + int __msi_domain_alloc_irqs(struct irq_domain *domain, struct device *dev, int nvec) { @@ -546,6 +567,7 @@ int __msi_domain_alloc_irqs(struct irq_d struct irq_data *irq_data; struct msi_desc *desc; msi_alloc_info_t arg = { }; + int allocated = 0; int i, ret, virq; bool can_reserve; @@ -560,16 +582,15 @@ int __msi_domain_alloc_irqs(struct irq_d dev_to_node(dev), &arg, false, desc->affinity); if (virq < 0) { - ret = -ENOSPC; - if (ops->handle_error) - ret = ops->handle_error(domain, desc, ret); - return ret; + ret = msi_handle_pci_fail(domain, desc, allocated); + goto cleanup; } for (i = 0; i < desc->nvec_used; i++) { irq_set_msi_desc_off(virq, i, desc); irq_debugfs_copy_devname(virq + i, dev); } + allocated++; } can_reserve = msi_check_reservation_mode(domain, info, dev);