From patchwork Fri Oct 21 17:41:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 13015206 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2FF38FA3743 for ; Fri, 21 Oct 2022 17:41:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230094AbiJURld (ORCPT ); Fri, 21 Oct 2022 13:41:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59764 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229615AbiJURl3 (ORCPT ); Fri, 21 Oct 2022 13:41:29 -0400 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F3C1824AE32; Fri, 21 Oct 2022 10:41:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=33I13543xxl5IpRI3N6CO97FrUmYnw9CKJFJpgwPP2E=; b=bgCCyiC80LwkdXBnalAtI8yTWC 4nCSWE1U2A1ySvyPV3WkvbtPKmCdf5mIA7Kn9LFX8StLBBLZtBnaer7mg65tIOxxPBIxYj1KvJfIL rWHBMfhn6BFIT2AutDopBuI2boeRuUmArJD+P8KpIHv+884xkRV8HDqdscPhcci0Ffdi6HQR+LUMe 3fTYi/Cr1SNAX/on0Le/wYgZ+EGvo9nM+tQeNLdYZpAMIkAOBTEtQfuUKhSALmiiVnPPx/nRSZC2+ qHzqF6KPUU4VTfcmUsz/jBWXiTnpwR40Qs+fltLB8upyLUJLFBnOw+QnXJI+tf9tvSD1VBHwJy4SU hSNPQy5Q==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1olw1K-00DoHz-5A; Fri, 21 Oct 2022 11:41:23 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1olw1G-0001tV-Es; Fri, 21 Oct 2022 11:41:18 -0600 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Cc: Christoph Hellwig , Greg Kroah-Hartman , Dan Williams , Jason Gunthorpe , =?utf-8?q?Christian_K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Martin Oliveira , Chaitanya Kulkarni , Ralph Campbell , Stephen Bates , Logan Gunthorpe Date: Fri, 21 Oct 2022 11:41:16 -0600 Message-Id: <20221021174116.7200-10-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221021174116.7200-1-logang@deltatee.com> References: <20221021174116.7200-1-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-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, hch@lst.de, gregkh@linuxfoundation.org, jgg@ziepe.ca, christian.koenig@amd.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, jason@jlekstrand.net, dave.hansen@linux.intel.com, helgaas@kernel.org, dan.j.williams@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, ira.weiny@intel.com, robin.murphy@arm.com, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, jhubbard@nvidia.com, rcampbell@nvidia.com, sbates@raithlin.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v11 9/9] ABI: sysfs-bus-pci: add documentation for p2pmem allocate X-SA-Exim-Version: 4.2.1 (built Sat, 13 Feb 2021 17:57:42 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add documentation for the p2pmem/allocate binary file which allows for allocating p2pmem buffers in userspace for passing to drivers that support them. (Currently only O_DIRECT to NVMe devices.) Signed-off-by: Logan Gunthorpe Reviewed-by: John Hubbard Reviewed-by: Greg Kroah-Hartman Reviewed-by: Chaitanya Kulkarni --- Documentation/ABI/testing/sysfs-bus-pci | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 840727fc75dc..ecf47559f495 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -407,6 +407,16 @@ Description: file contains a '1' if the memory has been published for use outside the driver that owns the device. +What: /sys/bus/pci/devices/.../p2pmem/allocate +Date: August 2022 +Contact: Logan Gunthorpe +Description: + This file allows mapping p2pmem into userspace. For each + mmap() call on this file, the kernel will allocate a chunk + of Peer-to-Peer memory for use in Peer-to-Peer transactions. + This memory can be used in O_DIRECT calls to NVMe backed + files for Peer-to-Peer copies. + What: /sys/bus/pci/devices/.../link/clkpm /sys/bus/pci/devices/.../link/l0s_aspm /sys/bus/pci/devices/.../link/l1_aspm