From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753313AbdLEKYO (ORCPT ); Tue, 5 Dec 2017 05:24:14 -0500 Received: from mail-pg0-f42.google.com ([74.125.83.42]:38521 "EHLO mail-pg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753267AbdLEKYK (ORCPT ); Tue, 5 Dec 2017 05:24:10 -0500 X-Google-Smtp-Source: AGs4zMadAOSFVEDm1/TECxcff7jXeW+KAPROIMNZq7KStBM65ziWyi8oJGi1/sI4C+RIMkHzslt7vA== Subject: [PATCH 15/17] scsi: arcmsr: Add driver module parameter msi_enable From: Ching Huang To: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: James.Bottomley@HansenPartnership.com, sfr@canb.auug.org.au Content-Type: text/plain; charset="UTF-8" Date: Tue, 05 Dec 2017 10:24:01 +0800 Message-ID: <1512440641.4577.80.camel@Centos6.3-64> Mime-Version: 1.0 X-Mailer: Evolution 2.32.3 (2.32.3-37.el6) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ching Huang Add module parameter msi_enable to has a chance to disable msi interrupt if between controller and system has msi INT compatible issue. Signed-off-by: Ching Huang --- diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c --- a/drivers/scsi/arcmsr/arcmsr_hba.c 2017-12-05 11:44:36.000000000 +0800 +++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2017-12-05 16:59:58.000000000 +0800 @@ -75,6 +75,10 @@ MODULE_DESCRIPTION("Areca ARC11xx/12xx/1 MODULE_LICENSE("Dual BSD/GPL"); MODULE_VERSION(ARCMSR_DRIVER_VERSION); +static int msi_enable = 1; +module_param(msi_enable, int, S_IRUGO); +MODULE_PARM_DESC(msi_enable, "Enable MSI interrupt(0 ~ 1), msi_enable=1(enable), =0(disable)"); + static int host_can_queue = ARCMSR_DEFAULT_OUTSTANDING_CMD; module_param(host_can_queue, int, S_IRUGO); MODULE_PARM_DESC(host_can_queue, " adapter queue depth(32 ~ 1024), default is 128"); @@ -831,11 +835,17 @@ arcmsr_request_irq(struct pci_dev *pdev, pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no); flags = 0; } else { - nvec = pci_alloc_irq_vectors(pdev, 1, 1, - PCI_IRQ_MSI | PCI_IRQ_LEGACY); + if (msi_enable == 1) { + nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); + if (nvec == 1) { + dev_info(&pdev->dev, "msi enabled\n"); + goto msi_int1; + } + } + nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_LEGACY); if (nvec < 1) return FAILED; - +msi_int1: flags = IRQF_SHARED; }