From patchwork Mon Sep 14 17:32:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jon Derrick X-Patchwork-Id: 11774609 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 5089B746 for ; Mon, 14 Sep 2020 17:53:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3DEB221D7B for ; Mon, 14 Sep 2020 17:53:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725948AbgINRxQ (ORCPT ); Mon, 14 Sep 2020 13:53:16 -0400 Received: from mga11.intel.com ([192.55.52.93]:63202 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726091AbgINRwv (ORCPT ); Mon, 14 Sep 2020 13:52:51 -0400 IronPort-SDR: oDGPHdV3qJnKdMjwLrRxwl1Ke72Ty+vRZjtdH2WKZ1rHStrCBTC/iKWcRZDwW5PH0iTeNXAmCL 9ijdFSafn5pg== X-IronPort-AV: E=McAfee;i="6000,8403,9744"; a="156567236" X-IronPort-AV: E=Sophos;i="5.76,426,1592895600"; d="scan'208";a="156567236" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Sep 2020 10:52:46 -0700 IronPort-SDR: c3kbMBguQuPV8Z71XgzxYqB9QoCBXSm2Re6n7mFs4efbzk6VRqY4BIJUC3Empl6MBxUdJ9DZNa PdwPzukIpCPg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,427,1592895600"; d="scan'208";a="450976037" Received: from unknown (HELO localhost.lm.intel.com) ([10.232.116.36]) by orsmga004.jf.intel.com with ESMTP; 14 Sep 2020 10:52:45 -0700 From: Jon Derrick To: Lorenzo Pieralisi Cc: , Keith Busch , Bjorn Helgaas , You-Sheng Yang , Jon Derrick Subject: [PATCH v2] PCI: vmd: Offset Client VMD MSI/X vectors Date: Mon, 14 Sep 2020 13:32:55 -0400 Message-Id: <20200914173255.5481-1-jonathan.derrick@intel.com> X-Mailer: git-send-email 2.18.1 Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Client VMD platforms have a software-triggered MSI/X vector 0 that will not forward hardware-remapped MSI/X vectors from the sub-device domain. This causes an issue with VMD platforms that use AHCI behind VMD and have a single MSI/X vector mapping to vector 0. Add an MSI/X vector offset for these platforms. Signed-off-by: Jon Derrick --- drivers/pci/controller/vmd.c | 35 +++++++++++++++++++++++++---------- 1 file changed, 25 insertions(+), 10 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index f69ef8c89f72..f8195bad79d1 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -53,6 +53,12 @@ enum vmd_features { * vendor-specific capability space */ VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP = (1 << 2), + + /* + * Device may use MSI/X vector 0 for software triggering and will not + * be used for MSI/X remapping + */ + VMD_FEAT_OFFSET_FIRST_VECTOR = (1 << 3), }; /* @@ -104,6 +110,7 @@ struct vmd_dev { struct irq_domain *irq_domain; struct pci_bus *bus; u8 busn_start; + u8 first_vec; }; static inline struct vmd_dev *vmd_from_bus(struct pci_bus *bus) @@ -199,25 +206,26 @@ static irq_hw_number_t vmd_get_hwirq(struct msi_domain_info *info, */ static struct vmd_irq_list *vmd_next_irq(struct vmd_dev *vmd, struct msi_desc *desc) { - int i, best = 1; unsigned long flags; + int i, best; if (vmd->msix_count == 1) - return &vmd->irqs[0]; + return &vmd->irqs[vmd->first_vec]; /* - * White list for fast-interrupt handlers. All others will share the + * Allow list for fast-interrupt handlers. All others will share the * "slow" interrupt vector. */ switch (msi_desc_to_pci_dev(desc)->class) { case PCI_CLASS_STORAGE_EXPRESS: break; default: - return &vmd->irqs[0]; + return &vmd->irqs[vmd->first_vec]; } raw_spin_lock_irqsave(&list_lock, flags); - for (i = 1; i < vmd->msix_count; i++) + best = vmd->first_vec + 1; + for (i = best; i < vmd->msix_count; i++) if (vmd->irqs[i].count < vmd->irqs[best].count) best = i; vmd->irqs[best].count++; @@ -629,6 +637,7 @@ static irqreturn_t vmd_irq(int irq, void *data) static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) { + unsigned long features = (unsigned long) id->driver_data; struct vmd_dev *vmd; int i, err; @@ -653,12 +662,15 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id) dma_set_mask_and_coherent(&dev->dev, DMA_BIT_MASK(32))) return -ENODEV; + if (features & VMD_FEAT_OFFSET_FIRST_VECTOR) + vmd->first_vec = 1; + vmd->msix_count = pci_msix_vec_count(dev); if (vmd->msix_count < 0) return -ENODEV; - vmd->msix_count = pci_alloc_irq_vectors(dev, 1, vmd->msix_count, - PCI_IRQ_MSIX); + vmd->msix_count = pci_alloc_irq_vectors(dev, vmd->first_vec + 1, + vmd->msix_count, PCI_IRQ_MSIX); if (vmd->msix_count < 0) return vmd->msix_count; @@ -755,13 +767,16 @@ static const struct pci_device_id vmd_ids[] = { VMD_FEAT_HAS_BUS_RESTRICTIONS,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x467f), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x4c3d), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_VMD_9A0B), .driver_data = VMD_FEAT_HAS_MEMBAR_SHADOW_VSCAP | - VMD_FEAT_HAS_BUS_RESTRICTIONS,}, + VMD_FEAT_HAS_BUS_RESTRICTIONS | + VMD_FEAT_OFFSET_FIRST_VECTOR,}, {0,} }; MODULE_DEVICE_TABLE(pci, vmd_ids);