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 X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D71FFC282C2 for ; Wed, 13 Feb 2019 17:55:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B57BB222B1 for ; Wed, 13 Feb 2019 17:55:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389316AbfBMRz6 (ORCPT ); Wed, 13 Feb 2019 12:55:58 -0500 Received: from ale.deltatee.com ([207.54.116.67]:54576 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2391418AbfBMRzF (ORCPT ); Wed, 13 Feb 2019 12:55:05 -0500 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gtykN-0001zC-5M; Wed, 13 Feb 2019 10:55:03 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1gtykL-0001yF-H7; Wed, 13 Feb 2019 10:54:57 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-ntb@googlegroups.com, linux-pci@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kselftest@vger.kernel.org, Jon Mason , Bjorn Helgaas , Joerg Roedel Cc: Allen Hubbe , Dave Jiang , Serge Semin , Eric Pilmore , Logan Gunthorpe Date: Wed, 13 Feb 2019 10:54:48 -0700 Message-Id: <20190213175454.7506-7-logang@deltatee.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20190213175454.7506-1-logang@deltatee.com> References: <20190213175454.7506-1-logang@deltatee.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-ntb@googlegroups.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-kselftest@vger.kernel.org, jdmason@kudzu.us, bhelgaas@google.com, joro@8bytes.org, dave.jiang@intel.com, allenbh@gmail.com, fancer.lancer@gmail.com, epilmore@gigaio.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v2 06/12] PCI/switchtec: Add module parameter to request more interrupts X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Seeing the we want to use more interrupts in the NTB MSI code we need to be able allocate more (sometimes virtual) interrupts in the switchtec driver. Therefore add a module parameter to request to allocate additional interrupts. This puts virtually no limit on the number of MSI interrupts available to NTB clients. Signed-off-by: Logan Gunthorpe Cc: Bjorn Helgaas --- drivers/pci/switch/switchtec.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c index e22766c79fe9..8b1db78197d9 100644 --- a/drivers/pci/switch/switchtec.c +++ b/drivers/pci/switch/switchtec.c @@ -30,6 +30,10 @@ module_param(use_dma_mrpc, bool, 0644); MODULE_PARM_DESC(use_dma_mrpc, "Enable the use of the DMA MRPC feature"); +static int nirqs = 32; +module_param(nirqs, int, 0644); +MODULE_PARM_DESC(nirqs, "number of interrupts to allocate (more may be useful for NTB applications)"); + static dev_t switchtec_devt; static DEFINE_IDA(switchtec_minor_ida); @@ -1247,8 +1251,12 @@ static int switchtec_init_isr(struct switchtec_dev *stdev) int dma_mrpc_irq; int rc; - nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, 4, - PCI_IRQ_MSIX | PCI_IRQ_MSI); + if (nirqs < 4) + nirqs = 4; + + nvecs = pci_alloc_irq_vectors(stdev->pdev, 1, nirqs, + PCI_IRQ_MSIX | PCI_IRQ_MSI | + PCI_IRQ_VIRTUAL); if (nvecs < 0) return nvecs; -- 2.19.0