From patchwork Wed Jan 9 13:50:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pankaj Gupta X-Patchwork-Id: 10754173 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 D0B5E6C2 for ; Wed, 9 Jan 2019 13:53:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C07432900C for ; Wed, 9 Jan 2019 13:53:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id BDC9228FC5; Wed, 9 Jan 2019 13:53:02 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 44C7E28FD8 for ; Wed, 9 Jan 2019 13:53:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731159AbfAINwy (ORCPT ); Wed, 9 Jan 2019 08:52:54 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54258 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729152AbfAINwx (ORCPT ); Wed, 9 Jan 2019 08:52:53 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CD88684B0; Wed, 9 Jan 2019 13:52:47 +0000 (UTC) Received: from dhcp201-121.englab.pnq.redhat.com (dhcp-10-65-161-145.pnq.redhat.com [10.65.161.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4FB48601A9; Wed, 9 Jan 2019 13:52:14 +0000 (UTC) From: Pankaj Gupta To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, linux-nvdimm@ml01.01.org, linux-fsdevel@vger.kernel.org, virtualization@lists.linux-foundation.org, linux-acpi@vger.kernel.org, linux-ext4@vger.kernel.org, linux-xfs@vger.kernel.org Cc: jack@suse.cz, stefanha@redhat.com, dan.j.williams@intel.com, riel@surriel.com, nilal@redhat.com, kwolf@redhat.com, pbonzini@redhat.com, zwisler@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, david@redhat.com, jmoyer@redhat.com, xiaoguangrong.eric@gmail.com, hch@infradead.org, mst@redhat.com, jasowang@redhat.com, lcapitulino@redhat.com, imammedo@redhat.com, eblake@redhat.com, willy@infradead.org, tytso@mit.edu, adilger.kernel@dilger.ca, darrick.wong@oracle.com, rjw@rjwysocki.net, pagupta@redhat.com Subject: [PATCH v3 3/5] libnvdimm: add nd_region buffered dax_dev flag Date: Wed, 9 Jan 2019 19:20:22 +0530 Message-Id: <20190109135024.14093-4-pagupta@redhat.com> In-Reply-To: <20190109135024.14093-1-pagupta@redhat.com> References: <20190109135024.14093-1-pagupta@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 09 Jan 2019 13:52:53 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch adds 'DAXDEV_BUFFERED' flag which is set for virtio pmem corresponding nd_region. This later is used to disable MAP_SYNC functionality for ext4 & xfs filesystem. Signed-off-by: Pankaj Gupta --- drivers/dax/super.c | 17 +++++++++++++++++ drivers/nvdimm/pmem.c | 3 +++ drivers/nvdimm/region_devs.c | 7 +++++++ drivers/virtio/pmem.c | 1 + include/linux/dax.h | 9 +++++++++ include/linux/libnvdimm.h | 6 ++++++ 6 files changed, 43 insertions(+) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 6e928f3..9128740 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -167,6 +167,8 @@ enum dax_device_flags { DAXDEV_ALIVE, /* gate whether dax_flush() calls the low level flush routine */ DAXDEV_WRITE_CACHE, + /* flag to disable MAP_SYNC for virtio based host page cache flush */ + DAXDEV_BUFFERED, }; /** @@ -335,6 +337,21 @@ bool dax_write_cache_enabled(struct dax_device *dax_dev) } EXPORT_SYMBOL_GPL(dax_write_cache_enabled); +void virtio_pmem_host_cache(struct dax_device *dax_dev, bool wc) +{ + if (wc) + set_bit(DAXDEV_BUFFERED, &dax_dev->flags); + else + clear_bit(DAXDEV_BUFFERED, &dax_dev->flags); +} +EXPORT_SYMBOL_GPL(virtio_pmem_host_cache); + +bool virtio_pmem_host_cache_enabled(struct dax_device *dax_dev) +{ + return test_bit(DAXDEV_BUFFERED, &dax_dev->flags); +} +EXPORT_SYMBOL_GPL(virtio_pmem_host_cache_enabled); + bool dax_alive(struct dax_device *dax_dev) { lockdep_assert_held(&dax_srcu); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index fe1217b..8d190a3 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -472,6 +472,9 @@ static int pmem_attach_disk(struct device *dev, return -ENOMEM; } dax_write_cache(dax_dev, nvdimm_has_cache(nd_region)); + + /* Set buffered bit in 'dax_dev' for virtio pmem */ + virtio_pmem_host_cache(dax_dev, nvdimm_is_buffered(nd_region)); pmem->dax_dev = dax_dev; gendev = disk_to_dev(disk); diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index f8218b4..1f8b2be 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1264,6 +1264,13 @@ int nd_region_conflict(struct nd_region *nd_region, resource_size_t start, return device_for_each_child(&nvdimm_bus->dev, &ctx, region_conflict); } +int nvdimm_is_buffered(struct nd_region *nd_region) +{ + return is_nd_pmem(&nd_region->dev) && + test_bit(ND_REGION_BUFFERED, &nd_region->flags); +} +EXPORT_SYMBOL_GPL(nvdimm_is_buffered); + void __exit nd_region_devs_exit(void) { ida_destroy(®ion_ida); diff --git a/drivers/virtio/pmem.c b/drivers/virtio/pmem.c index 51f5349..901767b 100644 --- a/drivers/virtio/pmem.c +++ b/drivers/virtio/pmem.c @@ -81,6 +81,7 @@ static int virtio_pmem_probe(struct virtio_device *vdev) ndr_desc.numa_node = nid; ndr_desc.flush = virtio_pmem_flush; set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags); + set_bit(ND_REGION_BUFFERED, &ndr_desc.flags); nd_region = nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc); nd_region->provider_data = dev_to_virtio (nd_region->dev.parent->parent); diff --git a/include/linux/dax.h b/include/linux/dax.h index 0dd316a..d16e03e 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -37,6 +37,8 @@ void put_dax(struct dax_device *dax_dev); void kill_dax(struct dax_device *dax_dev); void dax_write_cache(struct dax_device *dax_dev, bool wc); bool dax_write_cache_enabled(struct dax_device *dax_dev); +void virtio_pmem_host_cache(struct dax_device *dax_dev, bool wc); +bool virtio_pmem_host_cache_enabled(struct dax_device *dax_dev); #else static inline struct dax_device *dax_get_by_host(const char *host) { @@ -64,6 +66,13 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) { return false; } +static inline void virtio_pmem_host_cache(struct dax_device *dax_dev, bool wc) +{ +} +static inline bool virtio_pmem_host_cache_enabled(struct dax_device *dax_dev) +{ + return false; +} #endif struct writeback_control; diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h index ca8bc07..94616f1 100644 --- a/include/linux/libnvdimm.h +++ b/include/linux/libnvdimm.h @@ -64,6 +64,11 @@ enum { */ ND_REGION_PERSIST_MEMCTRL = 2, + /* provides virtio based asynchronous flush mechanism for buffered + * host page cache. + */ + ND_REGION_BUFFERED = 3, + /* mark newly adjusted resources as requiring a label update */ DPA_RESOURCE_ADJUSTED = 1 << 0, }; @@ -265,6 +270,7 @@ int generic_nvdimm_flush(struct nd_region *nd_region); int nvdimm_has_flush(struct nd_region *nd_region); int nvdimm_has_cache(struct nd_region *nd_region); int nvdimm_in_overwrite(struct nvdimm *nvdimm); +int nvdimm_is_buffered(struct nd_region *nd_region); static inline int nvdimm_ctl(struct nvdimm *nvdimm, unsigned int cmd, void *buf, unsigned int buf_len, int *cmd_rc)