From patchwork Mon Jun 15 13:28:18 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Marciniszyn, Mike" X-Patchwork-Id: 6609211 Return-Path: X-Original-To: patchwork-linux-rdma@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EF6F1C0020 for ; Mon, 15 Jun 2015 13:28:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CB81A202C8 for ; Mon, 15 Jun 2015 13:28:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7CE3320295 for ; Mon, 15 Jun 2015 13:28:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755500AbbFON2U (ORCPT ); Mon, 15 Jun 2015 09:28:20 -0400 Received: from mga02.intel.com ([134.134.136.20]:38721 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755491AbbFON2U (ORCPT ); Mon, 15 Jun 2015 09:28:20 -0400 Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga101.jf.intel.com with ESMTP; 15 Jun 2015 06:28:20 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,618,1427785200"; d="scan'208";a="743676101" Received: from sedona.ch.intel.com ([143.182.228.65]) by fmsmga002.fm.intel.com with ESMTP; 15 Jun 2015 06:28:21 -0700 Received: from phlsvsles11.ph.intel.com (phlsvsles11.ph.intel.com [10.228.195.43]) by sedona.ch.intel.com (8.13.6/8.14.3/Standard MailSET/Hub) with ESMTP id t5FDSJlL032324; Mon, 15 Jun 2015 06:28:19 -0700 Received: from phlsvslse11.ph.intel.com (localhost [127.0.0.1]) by phlsvsles11.ph.intel.com with ESMTP id t5FDSIXT030542; Mon, 15 Jun 2015 09:28:19 -0400 Subject: [PATCH v2 26/49] IB/hfi1: add user/kernel memory sharing hooks To: dledford@redhat.com From: Mike Marciniszyn Cc: linux-rdma@vger.kernel.org Date: Mon, 15 Jun 2015 09:28:18 -0400 Message-ID: <20150615132818.29741.95358.stgit@phlsvslse11.ph.intel.com> In-Reply-To: <20150615132434.29741.35258.stgit@phlsvslse11.ph.intel.com> References: <20150615132434.29741.35258.stgit@phlsvslse11.ph.intel.com> User-Agent: StGit/0.16 MIME-Version: 1.0 Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org X-Spam-Status: No, score=-7.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Signed-off-by: Andrew Friedley Signed-off-by: Arthur Kepner Signed-off-by: Brendan Cunningham Signed-off-by: Brian Welty Signed-off-by: Caz Yokoyama Signed-off-by: Dean Luick Signed-off-by: Dennis Dalessandro Signed-off-by: Easwar Hariharan Signed-off-by: Harish Chegondi Signed-off-by: Ira Weiny Signed-off-by: Jim Snow Signed-off-by: John Gregor Signed-off-by: Jubin John Signed-off-by: Kaike Wan Signed-off-by: Kevin Pine Signed-off-by: Kyle Liddell Signed-off-by: Mike Marciniszyn Signed-off-by: Mitko Haralanov Signed-off-by: Ravi Krishnaswamy Signed-off-by: Sadanand Warrier Signed-off-by: Sanath Kumar Signed-off-by: Sudeep Dutt Signed-off-by: Vlad Danushevsky --- drivers/infiniband/hw/hfi1/mmap.c | 192 +++++++++++++++++++++++++++++++++++++ 1 file changed, 192 insertions(+) create mode 100644 drivers/infiniband/hw/hfi1/mmap.c -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/infiniband/hw/hfi1/mmap.c b/drivers/infiniband/hw/hfi1/mmap.c new file mode 100644 index 0000000..5173b1c --- /dev/null +++ b/drivers/infiniband/hw/hfi1/mmap.c @@ -0,0 +1,192 @@ +/* + * + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2015 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Copyright(c) 2015 Intel Corporation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * - Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * - Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include +#include +#include +#include +#include +#include + +#include "verbs.h" + +/** + * hfi1_release_mmap_info - free mmap info structure + * @ref: a pointer to the kref within struct hfi1_mmap_info + */ +void hfi1_release_mmap_info(struct kref *ref) +{ + struct hfi1_mmap_info *ip = + container_of(ref, struct hfi1_mmap_info, ref); + struct hfi1_ibdev *dev = to_idev(ip->context->device); + + spin_lock_irq(&dev->pending_lock); + list_del(&ip->pending_mmaps); + spin_unlock_irq(&dev->pending_lock); + + vfree(ip->obj); + kfree(ip); +} + +/* + * open and close keep track of how many times the CQ is mapped, + * to avoid releasing it. + */ +static void hfi1_vma_open(struct vm_area_struct *vma) +{ + struct hfi1_mmap_info *ip = vma->vm_private_data; + + kref_get(&ip->ref); +} + +static void hfi1_vma_close(struct vm_area_struct *vma) +{ + struct hfi1_mmap_info *ip = vma->vm_private_data; + + kref_put(&ip->ref, hfi1_release_mmap_info); +} + +static struct vm_operations_struct hfi1_vm_ops = { + .open = hfi1_vma_open, + .close = hfi1_vma_close, +}; + +/** + * hfi1_mmap - create a new mmap region + * @context: the IB user context of the process making the mmap() call + * @vma: the VMA to be initialized + * Return zero if the mmap is OK. Otherwise, return an errno. + */ +int hfi1_mmap(struct ib_ucontext *context, struct vm_area_struct *vma) +{ + struct hfi1_ibdev *dev = to_idev(context->device); + unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; + unsigned long size = vma->vm_end - vma->vm_start; + struct hfi1_mmap_info *ip, *pp; + int ret = -EINVAL; + + /* + * Search the device's list of objects waiting for a mmap call. + * Normally, this list is very short since a call to create a + * CQ, QP, or SRQ is soon followed by a call to mmap(). + */ + spin_lock_irq(&dev->pending_lock); + list_for_each_entry_safe(ip, pp, &dev->pending_mmaps, + pending_mmaps) { + /* Only the creator is allowed to mmap the object */ + if (context != ip->context || (__u64) offset != ip->offset) + continue; + /* Don't allow a mmap larger than the object. */ + if (size > ip->size) + break; + + list_del_init(&ip->pending_mmaps); + spin_unlock_irq(&dev->pending_lock); + + ret = remap_vmalloc_range(vma, ip->obj, 0); + if (ret) + goto done; + vma->vm_ops = &hfi1_vm_ops; + vma->vm_private_data = ip; + hfi1_vma_open(vma); + goto done; + } + spin_unlock_irq(&dev->pending_lock); +done: + return ret; +} + +/* + * Allocate information for hfi1_mmap + */ +struct hfi1_mmap_info *hfi1_create_mmap_info(struct hfi1_ibdev *dev, + u32 size, + struct ib_ucontext *context, + void *obj) { + struct hfi1_mmap_info *ip; + + ip = kmalloc(sizeof(*ip), GFP_KERNEL); + if (!ip) + goto bail; + + size = PAGE_ALIGN(size); + + spin_lock_irq(&dev->mmap_offset_lock); + if (dev->mmap_offset == 0) + dev->mmap_offset = PAGE_SIZE; + ip->offset = dev->mmap_offset; + dev->mmap_offset += size; + spin_unlock_irq(&dev->mmap_offset_lock); + + INIT_LIST_HEAD(&ip->pending_mmaps); + ip->size = size; + ip->context = context; + ip->obj = obj; + kref_init(&ip->ref); + +bail: + return ip; +} + +void hfi1_update_mmap_info(struct hfi1_ibdev *dev, struct hfi1_mmap_info *ip, + u32 size, void *obj) +{ + size = PAGE_ALIGN(size); + + spin_lock_irq(&dev->mmap_offset_lock); + if (dev->mmap_offset == 0) + dev->mmap_offset = PAGE_SIZE; + ip->offset = dev->mmap_offset; + dev->mmap_offset += size; + spin_unlock_irq(&dev->mmap_offset_lock); + + ip->size = size; + ip->obj = obj; +}