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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 1obPEf-00862a-HO; Thu, 22 Sep 2022 10:39:39 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1obPEa-0001rh-MA; Thu, 22 Sep 2022 10:39:32 -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: Thu, 22 Sep 2022 10:39:18 -0600 Message-Id: <20220922163926.7077-1-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 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 v10 0/8] Userspace P2PDMA with O_DIRECT NVMe devices 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) ARC-Message-Signature: i=1; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=HifliSh6; spf=pass (imf12.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com; dmarc=pass (policy=none) header.from=deltatee.com X-Rspamd-Server: rspam03 X-HE-Tag: 1663864786-192379 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, This is the latest P2PDMA userspace patch set. This version includes some cleanup from feedback of the last posting[1]. This patch set enables userspace P2PDMA by allowing userspace to mmap() allocated chunks of the CMB. The resulting VMA can be passed only to O_DIRECT IO on NVMe backed files or block devices. A flag is added to GUP() in Patch 1, then Patches 2 through 6 wire this flag up based on whether the block queue indicates P2PDMA support. Patches 7 creates the sysfs resource that can hand out the VMAs and Patch 8 adds brief documentation for the new interface. Feedback welcome. This series is based on v6.0-rc6. A git branch is available here: https://github.com/sbates130272/linux-p2pmem/ p2pdma_user_cmb_v10 Thanks, Logan [1] https://lkml.kernel.org/r/20220825152425.6296-1-logang@deltatee.com Reviewed-by: Christoph Hellwig --- Changes since v8: - Rebased onto v6.0-rc6 - Reworked iov iter changes to reuse the code better and name them without the _flags() prefix (per Christoph) - Renamed a number of flags variables to gup_flags (per John) - Minor fixups to the last documentation patch (from Greg and John) Changes since v7: - Rebased onto v6.0-rc2, included reworking the iov_iter patch due to changes there - Drop the char device mmap implementation in favour of a sysfs based interface. (per Christoph) Changes since v6: - Rebase onto v5.19-rc1 - Rework how the pages are stored in the VMA per Jason's suggestion Changes since v5: - Rebased onto v5.18-rc1 which includes Christophs cleanup to free_zone_device_page() (similar to Ralph's patch). - Fix bug with concurrent first calls to pci_p2pdma_vma_fault() that caused a double allocation and lost p2p memory. Noticed by Andrew Maier. - Collected a Reviewed-by tag from Chaitanya. - Numerous minor fixes to commit messages -- Logan Gunthorpe (8): mm: introduce FOLL_PCI_P2PDMA to gate getting PCI P2PDMA pages iov_iter: introduce iov_iter_get_pages_[alloc_]flags() block: add check when merging zone device pages lib/scatterlist: add check when merging zone device pages block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() block: set FOLL_PCI_P2PDMA in bio_map_user_iov() PCI/P2PDMA: Allow userspace VMA allocations through sysfs ABI: sysfs-bus-pci: add documentation for p2pmem allocate Documentation/ABI/testing/sysfs-bus-pci | 10 ++ block/bio.c | 11 ++- block/blk-map.c | 7 +- drivers/pci/p2pdma.c | 124 ++++++++++++++++++++++++ include/linux/mm.h | 1 + include/linux/mmzone.h | 24 +++++ include/linux/uio.h | 6 ++ lib/iov_iter.c | 32 ++++-- lib/scatterlist.c | 25 +++-- mm/gup.c | 22 ++++- 10 files changed, 240 insertions(+), 22 deletions(-) base-commit: 521a547ced6477c54b4b0cc206000406c221b4d6 -- 2.30.2