From patchwork Tue Sep 25 16:22:20 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 10614407 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4D702112B for ; Tue, 25 Sep 2018 16:22:54 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3C7C12A9BA for ; Tue, 25 Sep 2018 16:22:54 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FBCE2A9C4; Tue, 25 Sep 2018 16:22:54 +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=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CABAE2A9BA for ; Tue, 25 Sep 2018 16:22:53 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 91EFA2194D3AE; Tue, 25 Sep 2018 09:22:52 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=207.54.116.67; helo=ale.deltatee.com; envelope-from=gunthorp@deltatee.com; receiver=linux-nvdimm@lists.01.org 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 A4F1D2194D3AE for ; Tue, 25 Sep 2018 09:22:51 -0700 (PDT) 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 1g4q6p-0002fG-OI; Tue, 25 Sep 2018 10:22:51 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1g4q6c-00019E-CX; Tue, 25 Sep 2018 10:22:34 -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 Date: Tue, 25 Sep 2018 10:22:20 -0600 Message-Id: <20180925162231.4354-3-logang@deltatee.com> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20180925162231.4354-1-logang@deltatee.com> References: <20180925162231.4354-1-logang@deltatee.com> MIME-Version: 1.0 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, 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, axboe@kernel.dk, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v7 02/13] PCI/P2PDMA: Add sysfs group to display p2pmem stats 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) X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jens Axboe , =?utf-8?q?Christian_K=C3=B6nig?= , Benjamin Herrenschmidt , Alex Williamson , =?utf-8?b?SsOpcsO0bWUgR2xp?= =?utf-8?b?c3Nl?= , Jason Gunthorpe , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Add a sysfs group to display statistics about P2P memory that is registered in each PCI device. Attributes in the group display the total amount of P2P memory, the amount available and whether it is published or not. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas --- Documentation/ABI/testing/sysfs-bus-pci | 24 +++++++++++ drivers/pci/p2pdma.c | 54 +++++++++++++++++++++++++ 2 files changed, 78 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 44d4b2be92fd..8bfee557e50e 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -323,3 +323,27 @@ Description: This is similar to /sys/bus/pci/drivers_autoprobe, but affects only the VFs associated with a specific PF. + +What: /sys/bus/pci/devices/.../p2pmem/size +Date: November 2017 +Contact: Logan Gunthorpe +Description: + If the device has any Peer-to-Peer memory registered, this + file contains the total amount of memory that the device + provides (in decimal). + +What: /sys/bus/pci/devices/.../p2pmem/available +Date: November 2017 +Contact: Logan Gunthorpe +Description: + If the device has any Peer-to-Peer memory registered, this + file contains the amount of memory that has not been + allocated (in decimal). + +What: /sys/bus/pci/devices/.../p2pmem/published +Date: November 2017 +Contact: Logan Gunthorpe +Description: + If the device has any Peer-to-Peer memory registered, this + file contains a '1' if the memory has been published for + use outside the driver that owns the device. diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index d9616522c1fc..d61389945da2 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -24,6 +24,54 @@ struct pci_p2pdma { bool p2pmem_published; }; +static ssize_t size_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + size_t size = 0; + + if (pdev->p2pdma->pool) + size = gen_pool_size(pdev->p2pdma->pool); + + return snprintf(buf, PAGE_SIZE, "%zd\n", size); +} +static DEVICE_ATTR_RO(size); + +static ssize_t available_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + size_t avail = 0; + + if (pdev->p2pdma->pool) + avail = gen_pool_avail(pdev->p2pdma->pool); + + return snprintf(buf, PAGE_SIZE, "%zd\n", avail); +} +static DEVICE_ATTR_RO(available); + +static ssize_t published_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return snprintf(buf, PAGE_SIZE, "%d\n", + pdev->p2pdma->p2pmem_published); +} +static DEVICE_ATTR_RO(published); + +static struct attribute *p2pmem_attrs[] = { + &dev_attr_size.attr, + &dev_attr_available.attr, + &dev_attr_published.attr, + NULL, +}; + +static const struct attribute_group p2pmem_group = { + .attrs = p2pmem_attrs, + .name = "p2pmem", +}; + static void pci_p2pdma_percpu_release(struct percpu_ref *ref) { struct pci_p2pdma *p2p = @@ -53,6 +101,7 @@ static void pci_p2pdma_release(void *data) percpu_ref_exit(&pdev->p2pdma->devmap_ref); gen_pool_destroy(pdev->p2pdma->pool); + sysfs_remove_group(&pdev->dev.kobj, &p2pmem_group); pdev->p2pdma = NULL; } @@ -83,9 +132,14 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) pdev->p2pdma = p2p; + error = sysfs_create_group(&pdev->dev.kobj, &p2pmem_group); + if (error) + goto out_pool_destroy; + return 0; out_pool_destroy: + pdev->p2pdma = NULL; gen_pool_destroy(p2p->pool); out: devm_kfree(&pdev->dev, p2p);