From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ale.deltatee.com (ale.deltatee.com [207.54.116.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 7B90E21B02822 for ; Thu, 4 Oct 2018 14:27:57 -0700 (PDT) From: Logan Gunthorpe Date: Thu, 4 Oct 2018 15:27:45 -0600 Message-Id: <20181004212747.6301-12-logang@deltatee.com> In-Reply-To: <20181004212747.6301-1-logang@deltatee.com> References: <20181004212747.6301-1-logang@deltatee.com> MIME-Version: 1.0 Subject: [PATCH v9 11/13] nvme-pci: Add a quirk for a pseudo CMB List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" 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: Jens Axboe , =?UTF-8?q?Christian=20K=C3=B6nig?= , Benjamin Herrenschmidt , Alex Williamson , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jason Gunthorpe , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig List-ID: 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 Reviewed-by: Keith Busch --- 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 4030743c90aa..8e6f3bcfe956 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -90,6 +90,13 @@ enum nvme_quirks { * Set MEDIUM priority on SQ creation */ NVME_QUIRK_MEDIUM_PRIO_SQ = (1 << 7), + + /* + * 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 << 8), }; /* diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 0d6c41bc2b35..db862ee6e53e 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1644,6 +1644,13 @@ 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; @@ -1663,10 +1670,15 @@ 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); @@ -2715,6 +2727,10 @@ static const struct pci_device_id nvme_id_table[] = { .driver_data = NVME_QUIRK_LIGHTNVM, }, { PCI_DEVICE(0x1d1d, 0x2601), /* CNEX Granby */ .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) }, -- 2.19.0 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm