From: Jason Gunthorpe <jgg@ziepe.ca>
To: Logan Gunthorpe <logang@deltatee.com>
Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org,
linux-block@vger.kernel.org, linux-pci@vger.kernel.org,
linux-mm@kvack.org, iommu@lists.linux-foundation.org,
"Stephen Bates" <sbates@raithlin.com>,
"Christoph Hellwig" <hch@lst.de>,
"Dan Williams" <dan.j.williams@intel.com>,
"Christian König" <christian.koenig@amd.com>,
"John Hubbard" <jhubbard@nvidia.com>,
"Don Dutile" <ddutile@redhat.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Daniel Vetter" <daniel.vetter@ffwll.ch>,
"Jakowski Andrzej" <andrzej.jakowski@intel.com>,
"Minturn Dave B" <dave.b.minturn@intel.com>,
"Jason Ekstrand" <jason@jlekstrand.net>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Xiong Jianxin" <jianxin.xiong@intel.com>,
"Bjorn Helgaas" <helgaas@kernel.org>,
"Ira Weiny" <ira.weiny@intel.com>,
"Robin Murphy" <robin.murphy@arm.com>,
"Martin Oliveira" <martin.oliveira@eideticom.com>,
"Chaitanya Kulkarni" <ckulkarnilinux@gmail.com>,
"Ralph Campbell" <rcampbell@nvidia.com>
Subject: Re: [PATCH v5 22/24] mm: use custom page_free for P2PDMA pages
Date: Fri, 28 Jan 2022 10:22:51 -0400 [thread overview]
Message-ID: <20220128142251.GV8034@ziepe.ca> (raw)
In-Reply-To: <20220128002614.6136-23-logang@deltatee.com>
On Thu, Jan 27, 2022 at 05:26:12PM -0700, Logan Gunthorpe wrote:
> When P2PDMA pages are passed to userspace, they will need to be
> reference counted properly and returned to their genalloc after their
> reference count returns to 1. This is accomplished with the existing
It is reference count returns to 0 now, right?
Jason
next prev parent reply other threads:[~2022-01-28 14:22 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-28 0:25 [PATCH v5 00/24] Userspace P2PDMA with O_DIRECT NVMe devices Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 01/24] ext4/xfs: add page refcount helper Logan Gunthorpe
2022-01-28 9:26 ` Chaitanya Kulkarni
2022-01-28 0:25 ` [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page refcount Logan Gunthorpe
2022-01-28 14:21 ` Jason Gunthorpe
2022-01-28 16:51 ` Logan Gunthorpe
2022-01-28 17:16 ` Ralph Campbell
2022-01-28 0:25 ` [PATCH v5 03/24] lib/scatterlist: add flag for indicating P2PDMA segments in an SGL Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 04/24] PCI/P2PDMA: Attempt to set map_type if it has not been set Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 05/24] PCI/P2PDMA: Expose pci_p2pdma_map_type() Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 06/24] PCI/P2PDMA: Introduce helpers for dma_map_sg implementations Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 07/24] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 08/24] dma-direct: support PCI P2PDMA pages in dma-direct map_sg Logan Gunthorpe
2022-02-01 20:53 ` Jonathan Derrick
2022-02-01 20:57 ` Logan Gunthorpe
2022-01-28 0:25 ` [PATCH v5 09/24] dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 10/24] iommu/dma: support PCI P2PDMA pages in dma-iommu map_sg Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 11/24] nvme-pci: check DMA ops when indicating support for PCI P2PDMA Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 12/24] nvme-pci: convert to using dma_map_sgtable() Logan Gunthorpe
2022-01-28 9:13 ` Chaitanya Kulkarni
2022-01-28 0:26 ` [PATCH v5 13/24] RDMA/core: introduce ib_dma_pci_p2p_dma_supported() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 14/24] RDMA/rw: drop pci_p2pdma_[un]map_sg() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 15/24] PCI/P2PDMA: Remove pci_p2pdma_[un]map_sg() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 16/24] mm: introduce FOLL_PCI_P2PDMA to gate getting PCI P2PDMA pages Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 17/24] iov_iter: introduce iov_iter_get_pages_[alloc_]flags() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 18/24] block: add check when merging zone device pages Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 19/24] lib/scatterlist: " Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 20/24] block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 21/24] block: set FOLL_PCI_P2PDMA in bio_map_user_iov() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 22/24] mm: use custom page_free for P2PDMA pages Logan Gunthorpe
2022-01-28 14:22 ` Jason Gunthorpe [this message]
2022-01-28 16:52 ` Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 23/24] PCI/P2PDMA: Introduce pci_mmap_p2pmem() Logan Gunthorpe
2022-01-28 0:26 ` [PATCH v5 24/24] nvme-pci: allow mmaping the CMB in userspace Logan Gunthorpe
2022-01-31 18:56 ` [PATCH v5 00/24] Userspace P2PDMA with O_DIRECT NVMe devices Jonathan Derrick
2022-01-31 19:00 ` Logan Gunthorpe
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