From patchwork Fri Apr 7 22:07:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Jiang X-Patchwork-Id: 9670529 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 0F60D602B3 for ; Fri, 7 Apr 2017 22:08:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F2E8528645 for ; Fri, 7 Apr 2017 22:08:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E76A428663; Fri, 7 Apr 2017 22:08:02 +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=-1.9 required=2.0 tests=BAYES_00, 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 3938C28645 for ; Fri, 7 Apr 2017 22:08:02 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 318342194235E; Fri, 7 Apr 2017 15:08:02 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) (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 EC8622194235E for ; Fri, 7 Apr 2017 15:08:00 -0700 (PDT) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga105.fm.intel.com with ESMTP; 07 Apr 2017 15:08:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos; i="5.37,168,1488873600"; d="scan'208"; a="1117090192" Received: from djiang5-desk3.ch.intel.com ([143.182.137.38]) by orsmga001.jf.intel.com with ESMTP; 07 Apr 2017 15:07:59 -0700 Subject: [PATCH v5 4/4] device-dax, tools/testing/nvdimm: enable device-dax with mock resources From: Dave Jiang To: dan.j.williams@intel.com Date: Fri, 07 Apr 2017 15:07:59 -0700 Message-ID: <149160287972.35898.12786430906244720402.stgit@djiang5-desk3.ch.intel.com> In-Reply-To: <149160286313.35898.16564013661054174450.stgit@djiang5-desk3.ch.intel.com> References: <149160286313.35898.16564013661054174450.stgit@djiang5-desk3.ch.intel.com> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-nvdimm@lists.01.org Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Provide a replacement pgoff_to_phys() that translates an nfit_test resource (allocated by vmalloc()) to a pfn. Signed-off-by: Dave Jiang Reviewed-by: Johannes Thumshirn Signed-off-by: Dan Williams --- drivers/dax/dax-private.h | 61 ++++++++++++++++++++++++++++++++++++++++ drivers/dax/dax.c | 52 ++++------------------------------ tools/testing/nvdimm/Kbuild | 3 +- tools/testing/nvdimm/dax-dev.c | 49 ++++++++++++++++++++++++++++++++ 4 files changed, 118 insertions(+), 47 deletions(-) create mode 100644 drivers/dax/dax-private.h create mode 100644 tools/testing/nvdimm/dax-dev.c diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h new file mode 100644 index 0000000..c45ac94a --- /dev/null +++ b/drivers/dax/dax-private.h @@ -0,0 +1,61 @@ +/* + * Copyright(c) 2016 Intel Corporation. All rights reserved. + * + * 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. + */ +#ifndef __DAX_PRIVATE_H__ +#define __DAX_PRIVATE_H__ + +#include +#include + +/** + * struct dax_region - mapping infrastructure for dax devices + * @id: kernel-wide unique region for a memory range + * @base: linear address corresponding to @res + * @kref: to pin while other agents have a need to do lookups + * @dev: parent device backing this region + * @align: allocation and mapping alignment for child dax devices + * @res: physical address range of the region + * @pfn_flags: identify whether the pfns are paged back or not + */ +struct dax_region { + int id; + struct ida ida; + void *base; + struct kref kref; + struct device *dev; + unsigned int align; + struct resource res; + unsigned long pfn_flags; +}; + +/** + * struct dax_dev - subdivision of a dax region + * @region - parent region + * @inode - inode + * @dev - device backing the character device + * @cdev - core chardev data + * @alive - !alive + rcu grace period == no new mappings can be established + * @id - child id in the region + * @num_resources - number of physical address extents in this device + * @res - array of physical address ranges + */ +struct dax_dev { + struct dax_region *region; + struct inode *inode; + struct device dev; + struct cdev cdev; + bool alive; + int id; + int num_resources; + struct resource res[0]; +}; +#endif diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c index 80c6db279..3a29b97 100644 --- a/drivers/dax/dax.c +++ b/drivers/dax/dax.c @@ -22,6 +22,7 @@ #include #include #include +#include "dax-private.h" #include "dax.h" static dev_t dax_devt; @@ -34,48 +35,6 @@ static struct kmem_cache *dax_cache __read_mostly; static struct super_block *dax_superblock __read_mostly; MODULE_PARM_DESC(nr_dax, "max number of device-dax instances"); -/** - * struct dax_region - mapping infrastructure for dax devices - * @id: kernel-wide unique region for a memory range - * @base: linear address corresponding to @res - * @kref: to pin while other agents have a need to do lookups - * @dev: parent device backing this region - * @align: allocation and mapping alignment for child dax devices - * @res: physical address range of the region - * @pfn_flags: identify whether the pfns are paged back or not - */ -struct dax_region { - int id; - struct ida ida; - void *base; - struct kref kref; - struct device *dev; - unsigned int align; - struct resource res; - unsigned long pfn_flags; -}; - -/** - * struct dax_dev - subdivision of a dax region - * @region - parent region - * @dev - device backing the character device - * @cdev - core chardev data - * @alive - !alive + rcu grace period == no new mappings can be established - * @id - child id in the region - * @num_resources - number of physical address extents in this device - * @res - array of physical address ranges - */ -struct dax_dev { - struct dax_region *region; - struct inode *inode; - struct device dev; - struct cdev cdev; - bool alive; - int id; - int num_resources; - struct resource res[0]; -}; - static ssize_t id_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -396,7 +355,8 @@ static int check_vma(struct dax_dev *dax_dev, struct vm_area_struct *vma, return 0; } -static phys_addr_t pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff, +/* see "strong" declaration in tools/testing/nvdimm/dax-dev.c */ +__weak phys_addr_t dax_pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff, unsigned long size) { struct resource *res; @@ -441,7 +401,7 @@ static int __dax_dev_pte_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) if (fault_size != dax_region->align) return VM_FAULT_SIGBUS; - phys = pgoff_to_phys(dax_dev, vmf->pgoff, PAGE_SIZE); + phys = dax_pgoff_to_phys(dax_dev, vmf->pgoff, PAGE_SIZE); if (phys == -1) { dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, vmf->pgoff); @@ -496,7 +456,7 @@ static int __dax_dev_pmd_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) return VM_FAULT_SIGBUS; pgoff = linear_page_index(vmf->vma, pmd_addr); - phys = pgoff_to_phys(dax_dev, pgoff, PMD_SIZE); + phys = dax_pgoff_to_phys(dax_dev, pgoff, PMD_SIZE); if (phys == -1) { dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, pgoff); @@ -547,7 +507,7 @@ static int __dax_dev_pud_fault(struct dax_dev *dax_dev, struct vm_fault *vmf) return VM_FAULT_SIGBUS; pgoff = linear_page_index(vmf->vma, pud_addr); - phys = pgoff_to_phys(dax_dev, pgoff, PUD_SIZE); + phys = dax_pgoff_to_phys(dax_dev, pgoff, PUD_SIZE); if (phys == -1) { dev_dbg(dev, "%s: pgoff_to_phys(%#lx) failed\n", __func__, pgoff); diff --git a/tools/testing/nvdimm/Kbuild b/tools/testing/nvdimm/Kbuild index 405212b..6dcb3c4 100644 --- a/tools/testing/nvdimm/Kbuild +++ b/tools/testing/nvdimm/Kbuild @@ -28,7 +28,7 @@ obj-$(CONFIG_ND_BTT) += nd_btt.o obj-$(CONFIG_ND_BLK) += nd_blk.o obj-$(CONFIG_X86_PMEM_LEGACY) += nd_e820.o obj-$(CONFIG_ACPI_NFIT) += nfit.o -obj-$(CONFIG_DEV_DAX) += dax.o +obj-$(CONFIG_DEV_DAX) += dax.o dax-dev.o obj-$(CONFIG_DEV_DAX_PMEM) += dax_pmem.o nfit-y := $(ACPI_SRC)/core.o @@ -49,6 +49,7 @@ nd_e820-y := $(NVDIMM_SRC)/e820.o nd_e820-y += config_check.o dax-y := $(DAX_SRC)/dax.o +dax-y += dax-dev.o dax-y += config_check.o dax_pmem-y := $(DAX_SRC)/pmem.o diff --git a/tools/testing/nvdimm/dax-dev.c b/tools/testing/nvdimm/dax-dev.c new file mode 100644 index 0000000..e89721d8 --- /dev/null +++ b/tools/testing/nvdimm/dax-dev.c @@ -0,0 +1,49 @@ +/* + * Copyright (c) 2016, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. + */ +#include "test/nfit_test.h" +#include +#include "../../../drivers/dax/dax-private.h" + +phys_addr_t dax_pgoff_to_phys(struct dax_dev *dax_dev, pgoff_t pgoff, + unsigned long size) +{ + struct resource *res; + phys_addr_t addr; + int i; + + for (i = 0; i < dax_dev->num_resources; i++) { + res = &dax_dev->res[i]; + addr = pgoff * PAGE_SIZE + res->start; + if (addr >= res->start && addr <= res->end) + break; + pgoff -= PHYS_PFN(resource_size(res)); + } + + if (i < dax_dev->num_resources) { + res = &dax_dev->res[i]; + if (addr + size - 1 <= res->end) { + if (get_nfit_res(addr)) { + struct page *page; + + if (dax_dev->region->align > PAGE_SIZE) + return -1; + + page = vmalloc_to_page((void *)addr); + return PFN_PHYS(page_to_pfn(page)); + } else + return addr; + } + } + + return -1; +}