From patchwork Mon Oct 21 11:47:39 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Derrick X-Patchwork-Id: 11202789 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 00BFF13B1 for ; Mon, 21 Oct 2019 17:49:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DCB0A20B7C for ; Mon, 21 Oct 2019 17:49:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727211AbfJURtS (ORCPT ); Mon, 21 Oct 2019 13:49:18 -0400 Received: from mga05.intel.com ([192.55.52.43]:46782 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727171AbfJURtS (ORCPT ); Mon, 21 Oct 2019 13:49:18 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 21 Oct 2019 10:49:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,324,1566889200"; d="scan'208";a="187618179" Received: from unknown (HELO nsgsw-rhel7p6.lm.intel.com) ([10.232.116.12]) by orsmga007.jf.intel.com with ESMTP; 21 Oct 2019 10:49:17 -0700 From: Jon Derrick To: Lorenzo Pieralisi Cc: Bjorn Helgaas , Keith Busch , , Jon Derrick Subject: [PATCH 2/2] PCI: vmd: Add indirection layer to vmd irq lists Date: Mon, 21 Oct 2019 05:47:39 -0600 Message-Id: <1571658459-5668-3-git-send-email-jonathan.derrick@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1571658459-5668-1-git-send-email-jonathan.derrick@intel.com> References: <1571658459-5668-1-git-send-email-jonathan.derrick@intel.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org With CONFIG_MAXSMP and other debugging options enabled, the size of an srcu_struct can grow quite large. These are embedded in the vmd_irq_list struct, and a N=64 allocation can exceed MAX_ORDER, violating reclaim rules. This patch changes the irq list array into an array of pointers to irq lists to avoid allocation failures with greater msix counts. Signed-off-by: Jon Derrick --- drivers/pci/controller/vmd.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index c4de95a..096006e 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -92,7 +92,7 @@ struct vmd_dev { char __iomem *cfgbar; int msix_count; - struct vmd_irq_list *irqs; + struct vmd_irq_list **irqs; struct pci_sysdata sysdata; struct resource resources[3]; @@ -194,7 +194,7 @@ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *d unsigned long flags; if (vmd->msix_count == 1) - return &vmd->irqs[0]; + return vmd->irqs[0]; /* * White list for fast-interrupt handlers. All others will share the @@ -204,17 +204,17 @@ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *d case PCI_CLASS_STORAGE_EXPRESS: break; default: - return &vmd->irqs[0]; + return vmd->irqs[0]; } raw_spin_lock_irqsave(&list_lock, flags); for (i = 1; i < vmd->msix_count; i++) - if (vmd->irqs[i].count < vmd->irqs[best].count) + if (vmd->irqs[i]->count < vmd->irqs[best]->count) best = i; - vmd->irqs[best].count++; + vmd->irqs[best]->count++; raw_spin_unlock_irqrestore(&list_lock, flags); - return &vmd->irqs[best]; + return vmd->irqs[best]; } static int vmd_msi_init(struct irq_domain *domain, struct msi_domain_info *info, @@ -764,15 +764,22 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) return -ENOMEM; for (i = 0; i < vmd->msix_count; i++) { - err = init_srcu_struct(&vmd->irqs[i].srcu); + vmd->irqs[i] = devm_kcalloc(&dev->dev, 1, sizeof(**vmd->irqs), + GFP_KERNEL); + if (!vmd->irqs[i]) + return -ENOMEM; + } + + for (i = 0; i < vmd->msix_count; i++) { + err = init_srcu_struct(&vmd->irqs[i]->srcu); if (err) return err; - INIT_LIST_HEAD(&vmd->irqs[i].irq_list); - vmd->irqs[i].index = i; + INIT_LIST_HEAD(&vmd->irqs[i]->irq_list); + vmd->irqs[i]->index = i; err = devm_request_irq(&dev->dev, pci_irq_vector(dev, i), vmd_irq, IRQF_NO_THREAD, - "vmd", &vmd->irqs[i]); + "vmd", vmd->irqs[i]); if (err) return err; } @@ -793,7 +800,7 @@ static void vmd_cleanup_srcu(struct vmd_dev *vmd) int i; for (i = 0; i < vmd->msix_count; i++) - cleanup_srcu_struct(&vmd->irqs[i].srcu); + cleanup_srcu_struct(&vmd->irqs[i]->srcu); } static void vmd_remove(struct pci_dev *dev) @@ -817,7 +824,7 @@ static int vmd_suspend(struct device *dev) int i; for (i = 0; i < vmd->msix_count; i++) - devm_free_irq(dev, pci_irq_vector(pdev, i), &vmd->irqs[i]); + devm_free_irq(dev, pci_irq_vector(pdev, i), vmd->irqs[i]); pci_save_state(pdev); return 0; @@ -832,7 +839,7 @@ static int vmd_resume(struct device *dev) for (i = 0; i < vmd->msix_count; i++) { err = devm_request_irq(dev, pci_irq_vector(pdev, i), vmd_irq, IRQF_NO_THREAD, - "vmd", &vmd->irqs[i]); + "vmd", vmd->irqs[i]); if (err) return err; }