From patchwork Mon Apr 23 23:30:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 10358265 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 C217060225 for ; Mon, 23 Apr 2018 23:31:12 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BABE128C67 for ; Mon, 23 Apr 2018 23:31:12 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AA27028CA2; Mon, 23 Apr 2018 23:31:12 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 2352928C9B for ; Mon, 23 Apr 2018 23:31:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932689AbeDWXbK (ORCPT ); Mon, 23 Apr 2018 19:31:10 -0400 Received: from ale.deltatee.com ([207.54.116.67]:41920 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932652AbeDWXbF (ORCPT ); Mon, 23 Apr 2018 19:31:05 -0400 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 1fAkvB-0006JA-Ox; Mon, 23 Apr 2018 17:30:59 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1fAkv3-0005bp-UP; Mon, 23 Apr 2018 17:30:49 -0600 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 , Alex Williamson , =?UTF-8?q?Christian=20K=C3=B6nig?= , Logan Gunthorpe Date: Mon, 23 Apr 2018 17:30:43 -0600 Message-Id: <20180423233046.21476-12-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180423233046.21476-1-logang@deltatee.com> References: <20180423233046.21476-1-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, benh@kernel.crashing.org, jglisse@redhat.com, alex.williamson@redhat.com, christian.koenig@amd.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v4 11/14] 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-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@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 Reviewed-by: Sagi Grimberg --- 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 9a689c13998f..885e9ec9b889 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -84,6 +84,13 @@ 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 09b6aba6ed28..e526e969680a 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1685,6 +1685,13 @@ 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; @@ -1704,10 +1711,15 @@ 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); @@ -2736,6 +2748,10 @@ 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) },