From patchwork Wed Oct 2 10:49:11 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Gordeev X-Patchwork-Id: 2976781 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 346059F245 for ; Wed, 2 Oct 2013 17:24:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 97210203A3 for ; Wed, 2 Oct 2013 17:24:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7B70E20155 for ; Wed, 2 Oct 2013 17:24:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755031Ab3JBRXs (ORCPT ); Wed, 2 Oct 2013 13:23:48 -0400 Received: from 221-186-24-89.in-addr.arpa ([89.24.186.221]:26029 "EHLO dhcp-26-207.brq.redhat.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754263Ab3JBRXp (ORCPT ); Wed, 2 Oct 2013 13:23:45 -0400 Received: from dhcp-26-207.brq.redhat.com (localhost [127.0.0.1]) by dhcp-26-207.brq.redhat.com (8.14.5/8.14.5) with ESMTP id r92Ax0Pa002692; Wed, 2 Oct 2013 12:59:01 +0200 Received: (from agordeev@localhost) by dhcp-26-207.brq.redhat.com (8.14.5/8.14.5/Submit) id r92AwvOW002691; Wed, 2 Oct 2013 12:58:57 +0200 From: Alexander Gordeev To: linux-kernel@vger.kernel.org Cc: Alexander Gordeev , Bjorn Helgaas , Ralf Baechle , Michael Ellerman , Benjamin Herrenschmidt , Martin Schwidefsky , Ingo Molnar , Tejun Heo , Dan Williams , Andy King , Jon Mason , Matt Porter , linux-pci@vger.kernel.org, linux-mips@linux-mips.org, linuxppc-dev@lists.ozlabs.org, linux390@de.ibm.com, linux-s390@vger.kernel.org, x86@kernel.org, linux-ide@vger.kernel.org, iss_storagedev@hp.com, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, e1000-devel@lists.sourceforge.net, linux-driver@qlogic.com, Solarflare linux maintainers , "VMware, Inc." , linux-scsi@vger.kernel.org Subject: [PATCH RFC 55/77] ntb: Update MSI/MSI-X interrupts enablement code Date: Wed, 2 Oct 2013 12:49:11 +0200 Message-Id: <49eb592e15aaec804f9c11ca132d2b85c516aefa.1380703263.git.agordeev@redhat.com> X-Mailer: git-send-email 1.7.7.6 In-Reply-To: References: Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP As result of recent re-design of the MSI/MSI-X interrupts enabling pattern this driver has to be updated to use the new technique to obtain a optimal number of MSI/MSI-X interrupts required. Signed-off-by: Alexander Gordeev --- drivers/ntb/ntb_hw.c | 41 +++++++++++++---------------------------- drivers/ntb/ntb_hw.h | 2 -- 2 files changed, 13 insertions(+), 30 deletions(-) diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c index eccd5e5..7776429 100644 --- a/drivers/ntb/ntb_hw.c +++ b/drivers/ntb/ntb_hw.c @@ -1032,23 +1032,26 @@ static int ntb_setup_msix(struct ntb_device *ndev) struct msix_entry *msix; int msix_entries; int rc, i; - u16 val; - if (!pdev->msix_cap) { - rc = -EIO; + rc = pci_msix_table_size(pdev); + if (rc < 0) goto err; - } - rc = pci_read_config_word(pdev, pdev->msix_cap + PCI_MSIX_FLAGS, &val); - if (rc) + /* + * On SNB, the link interrupt is always tied to 4th vector. If + * we can't get all 4, then we can't use MSI-X. + */ + if ((rc < SNB_MSIX_CNT) && (ndev->hw_type != BWD_HW)) { + rc = -ENOSPC; goto err; - - msix_entries = msix_table_size(val); - if (msix_entries > ndev->limits.msix_cnt) { + } + if (rc > ndev->limits.msix_cnt) { rc = -EINVAL; goto err; } + msix_entries = rc; + ndev->msix_entries = kmalloc(sizeof(struct msix_entry) * msix_entries, GFP_KERNEL); if (!ndev->msix_entries) { @@ -1060,26 +1063,8 @@ static int ntb_setup_msix(struct ntb_device *ndev) ndev->msix_entries[i].entry = i; rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); - if (rc < 0) + if (rc) goto err1; - if (rc > 0) { - /* On SNB, the link interrupt is always tied to 4th vector. If - * we can't get all 4, then we can't use MSI-X. - */ - if ((rc < SNB_MSIX_CNT) && (ndev->hw_type != BWD_HW)) { - rc = -EIO; - goto err1; - } - - dev_warn(&pdev->dev, - "Only %d MSI-X vectors. Limiting the number of queues to that number.\n", - rc); - msix_entries = rc; - - rc = pci_enable_msix(pdev, ndev->msix_entries, msix_entries); - if (rc) - goto err1; - } for (i = 0; i < msix_entries; i++) { msix = &ndev->msix_entries[i]; diff --git a/drivers/ntb/ntb_hw.h b/drivers/ntb/ntb_hw.h index 0a31ced..50bd760 100644 --- a/drivers/ntb/ntb_hw.h +++ b/drivers/ntb/ntb_hw.h @@ -60,8 +60,6 @@ #define PCI_DEVICE_ID_INTEL_NTB_SS_HSX 0x2F0F #define PCI_DEVICE_ID_INTEL_NTB_B2B_BWD 0x0C4E -#define msix_table_size(control) ((control & PCI_MSIX_FLAGS_QSIZE)+1) - #ifndef readq static inline u64 readq(void __iomem *addr) {