From patchwork Thu Jan 4 19:01:36 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 10145479 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F369E6034B for ; Thu, 4 Jan 2018 19:04:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D284526E76 for ; Thu, 4 Jan 2018 19:04:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C5F4A287CB; Thu, 4 Jan 2018 19:04:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 793F526E76 for ; Thu, 4 Jan 2018 19:04:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753073AbeADTEI (ORCPT ); Thu, 4 Jan 2018 14:04:08 -0500 Received: from ale.deltatee.com ([207.54.116.67]:39244 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751679AbeADTCH (ORCPT ); Thu, 4 Jan 2018 14:02:07 -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 1eXAm4-0002vo-Te; Thu, 04 Jan 2018 12:02:05 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1eXAm0-00020r-70; Thu, 04 Jan 2018 12:01:52 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, linux-nvdimm@lists.01.org, linux-block@vger.kernel.org Cc: Stephen Bates , Christoph Hellwig , Jens Axboe , Keith Busch , Sagi Grimberg , Bjorn Helgaas , Jason Gunthorpe , Max Gurtovoy , Dan Williams , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Benjamin Herrenschmidt , Logan Gunthorpe Date: Thu, 4 Jan 2018 12:01:36 -0700 Message-Id: <20180104190137.7654-12-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180104190137.7654-1-logang@deltatee.com> References: <20180104190137.7654-1-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-block@vger.kernel.org, sbates@raithlin.com, hch@lst.de, axboe@kernel.dk, sagi@grimberg.me, bhelgaas@google.com, jgg@mellanox.com, maxg@mellanox.com, keith.busch@intel.com, dan.j.williams@intel.com, jglisse@redhat.com, benh@kernel.crashing.org, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH 11/12] nvme-pci: Add a quirk for a pseudo CMB 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 X-Virus-Scanned: ClamAV using ClamSMTP Introduce a quirk to use CMB-like memory on older devices that have an exposed BAR but do not advertise support for using CMBLOC and CMBSIZE. We'd like to use some of these older cards to test P2P memory. Signed-off-by: Logan Gunthorpe --- drivers/nvme/host/nvme.h | 7 +++++++ drivers/nvme/host/pci.c | 24 ++++++++++++++++++++---- 2 files changed, 27 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index ae1453238250..abaf18ff2e09 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -81,6 +81,13 @@ enum nvme_quirks { * Supports the LighNVM command set if indicated in vs[1]. */ NVME_QUIRK_LIGHTNVM = (1 << 6), + + /* + * Pseudo CMB Support on BAR 4. For adapters like the Microsemi + * NVRAM that have CMB-like memory on a BAR but does not set + * CMBLOC or CMBSZ. + */ + NVME_QUIRK_PSEUDO_CMB_BAR4 = (1 << 7), }; /* diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 29ef3fd24938..0b6ad30b64a6 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1688,6 +1688,13 @@ static ssize_t nvme_cmb_show(struct device *dev, } static DEVICE_ATTR(cmb, S_IRUGO, nvme_cmb_show, NULL); +static u32 nvme_pseudo_cmbsz(struct pci_dev *pdev, int bar) +{ + return NVME_CMBSZ_WDS | NVME_CMBSZ_RDS | + (((ilog2(SZ_16M) - 12) / 4) << NVME_CMBSZ_SZU_SHIFT) | + ((pci_resource_len(pdev, bar) / SZ_16M) << NVME_CMBSZ_SZ_SHIFT); +} + static u64 nvme_cmb_size_unit(struct nvme_dev *dev) { u8 szu = (dev->cmbsz >> NVME_CMBSZ_SZU_SHIFT) & NVME_CMBSZ_SZU_MASK; @@ -1707,10 +1714,15 @@ static void nvme_map_cmb(struct nvme_dev *dev) struct pci_dev *pdev = to_pci_dev(dev->dev); int bar; - dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); - if (!dev->cmbsz) - return; - dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); + if (dev->ctrl.quirks & NVME_QUIRK_PSEUDO_CMB_BAR4) { + dev->cmbsz = nvme_pseudo_cmbsz(pdev, 4); + dev->cmbloc = 4; + } else { + dev->cmbsz = readl(dev->bar + NVME_REG_CMBSZ); + if (!dev->cmbsz) + return; + dev->cmbloc = readl(dev->bar + NVME_REG_CMBLOC); + } size = nvme_cmb_size_unit(dev) * nvme_cmb_size(dev); offset = nvme_cmb_size_unit(dev) * NVME_CMB_OFST(dev->cmbloc); @@ -2708,6 +2720,10 @@ static const struct pci_device_id nvme_id_table[] = { .driver_data = NVME_QUIRK_LIGHTNVM, }, { PCI_DEVICE(0x1d1d, 0x2807), /* CNEX WL */ .driver_data = NVME_QUIRK_LIGHTNVM, }, + { PCI_DEVICE(0x11f8, 0xf117), /* Microsemi NVRAM adaptor */ + .driver_data = NVME_QUIRK_PSEUDO_CMB_BAR4, }, + { PCI_DEVICE(0x1db1, 0x0002), /* Everspin nvNitro adaptor */ + .driver_data = NVME_QUIRK_PSEUDO_CMB_BAR4, }, { PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_EXPRESS, 0xffffff) }, { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001) }, { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },