From: Logan Gunthorpe <logang@deltatee.com> 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, iommu@lists.linux-foundation.org Cc: "Stephen Bates" <sbates@raithlin.com>, "Christoph Hellwig" <hch@lst.de>, "Dan Williams" <dan.j.williams@intel.com>, "Jason Gunthorpe" <jgg@ziepe.ca>, "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>, "Logan Gunthorpe" <logang@deltatee.com>, "Bjorn Helgaas" <bhelgaas@google.com>, "Chaitanya Kulkarni" <kch@nvidia.com> Subject: [PATCH v5 04/24] PCI/P2PDMA: Attempt to set map_type if it has not been set Date: Thu, 27 Jan 2022 17:25:54 -0700 [thread overview] Message-ID: <20220128002614.6136-5-logang@deltatee.com> (raw) In-Reply-To: <20220128002614.6136-1-logang@deltatee.com> Attempt to find the mapping type for P2PDMA pages on the first DMA map attempt if it has not been done ahead of time. Previously, the mapping type was expected to be calculated ahead of time, but if pages are to come from userspace then there's no way to ensure the path was checked ahead of time. This change will calculate the mapping type if it hasn't pre-calculated so it is no longer invalid to call pci_p2pdma_map_sg() before the mapping type is calculated, so drop the WARN_ON when that is he case. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> --- drivers/pci/p2pdma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 1015274bd2fe..bb8900ce073a 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -848,6 +848,7 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; struct pci_dev *client; struct pci_p2pdma *p2pdma; + int dist; if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; @@ -864,6 +865,10 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, type = xa_to_value(xa_load(&p2pdma->map_types, map_types_idx(client))); rcu_read_unlock(); + + if (type == PCI_P2PDMA_MAP_UNKNOWN) + return calc_map_type_and_dist(provider, client, &dist, true); + return type; } @@ -906,7 +911,7 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, case PCI_P2PDMA_MAP_BUS_ADDR: return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents); default: - WARN_ON_ONCE(1); + /* Mapping is not Supported */ return 0; } } -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Logan Gunthorpe <logang@deltatee.com> 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, iommu@lists.linux-foundation.org Cc: "Daniel Vetter" <daniel.vetter@ffwll.ch>, "Dave Hansen" <dave.hansen@linux.intel.com>, "Stephen Bates" <sbates@raithlin.com>, "Jason Ekstrand" <jason@jlekstrand.net>, "Ira Weiny" <ira.weiny@intel.com>, "Christoph Hellwig" <hch@lst.de>, "Minturn Dave B" <dave.b.minturn@intel.com>, "Martin Oliveira" <martin.oliveira@eideticom.com>, "Matthew Wilcox" <willy@infradead.org>, "Jason Gunthorpe" <jgg@ziepe.ca>, "Chaitanya Kulkarni" <ckulkarnilinux@gmail.com>, "Bjorn Helgaas" <helgaas@kernel.org>, "Ralph Campbell" <rcampbell@nvidia.com>, "Chaitanya Kulkarni" <kch@nvidia.com>, "John Hubbard" <jhubbard@nvidia.com>, "Bjorn Helgaas" <bhelgaas@google.com>, "Dan Williams" <dan.j.williams@intel.com>, "Jakowski Andrzej" <andrzej.jakowski@intel.com>, "Xiong Jianxin" <jianxin.xiong@intel.com>, "Logan Gunthorpe" <logang@deltatee.com>, "Robin Murphy" <robin.murphy@arm.com>, "Christian König" <christian.koenig@amd.com> Subject: [PATCH v5 04/24] PCI/P2PDMA: Attempt to set map_type if it has not been set Date: Thu, 27 Jan 2022 17:25:54 -0700 [thread overview] Message-ID: <20220128002614.6136-5-logang@deltatee.com> (raw) In-Reply-To: <20220128002614.6136-1-logang@deltatee.com> Attempt to find the mapping type for P2PDMA pages on the first DMA map attempt if it has not been done ahead of time. Previously, the mapping type was expected to be calculated ahead of time, but if pages are to come from userspace then there's no way to ensure the path was checked ahead of time. This change will calculate the mapping type if it hasn't pre-calculated so it is no longer invalid to call pci_p2pdma_map_sg() before the mapping type is calculated, so drop the WARN_ON when that is he case. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com> --- drivers/pci/p2pdma.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 1015274bd2fe..bb8900ce073a 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -848,6 +848,7 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; struct pci_dev *client; struct pci_p2pdma *p2pdma; + int dist; if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; @@ -864,6 +865,10 @@ static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, type = xa_to_value(xa_load(&p2pdma->map_types, map_types_idx(client))); rcu_read_unlock(); + + if (type == PCI_P2PDMA_MAP_UNKNOWN) + return calc_map_type_and_dist(provider, client, &dist, true); + return type; } @@ -906,7 +911,7 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, case PCI_P2PDMA_MAP_BUS_ADDR: return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents); default: - WARN_ON_ONCE(1); + /* Mapping is not Supported */ return 0; } } -- 2.30.2 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2022-01-28 0:26 UTC|newest] Thread overview: 72+ 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 ` Logan Gunthorpe 2022-01-28 0:25 ` [PATCH v5 01/24] ext4/xfs: add page refcount helper Logan Gunthorpe 2022-01-28 0:25 ` Logan Gunthorpe 2022-01-28 9:26 ` Chaitanya Kulkarni 2022-01-28 9:26 ` Chaitanya Kulkarni via iommu 2022-01-28 0:25 ` [PATCH v5 02/24] mm: remove extra ZONE_DEVICE struct page refcount Logan Gunthorpe 2022-01-28 0:25 ` Logan Gunthorpe 2022-01-28 14:21 ` Jason Gunthorpe 2022-01-28 14:21 ` Jason Gunthorpe 2022-01-28 16:51 ` Logan Gunthorpe 2022-01-28 16:51 ` Logan Gunthorpe 2022-01-28 17:16 ` Ralph Campbell 2022-01-28 17:16 ` Ralph Campbell via iommu 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 ` Logan Gunthorpe 2022-01-28 0:25 ` Logan Gunthorpe [this message] 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 ` 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 ` 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 ` Logan Gunthorpe 2022-01-28 0:25 ` [PATCH v5 08/24] dma-direct: support PCI P2PDMA pages in dma-direct map_sg Logan Gunthorpe 2022-01-28 0:25 ` Logan Gunthorpe 2022-02-01 20:53 ` Jonathan Derrick 2022-02-01 20:53 ` Jonathan Derrick 2022-02-01 20:57 ` Logan Gunthorpe 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 0:25 ` 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 ` 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 ` Logan Gunthorpe 2022-01-28 0:26 ` [PATCH v5 12/24] nvme-pci: convert to using dma_map_sgtable() Logan Gunthorpe 2022-01-28 0:26 ` Logan Gunthorpe 2022-01-28 9:13 ` Chaitanya Kulkarni 2022-01-28 9:13 ` Chaitanya Kulkarni via iommu 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 ` 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 ` 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 ` 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 ` 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 ` 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 ` Logan Gunthorpe 2022-01-28 0:26 ` [PATCH v5 19/24] lib/scatterlist: " Logan Gunthorpe 2022-01-28 0:26 ` 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 ` 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 ` Logan Gunthorpe 2022-01-28 0:26 ` [PATCH v5 22/24] mm: use custom page_free for P2PDMA pages Logan Gunthorpe 2022-01-28 0:26 ` Logan Gunthorpe 2022-01-28 14:22 ` Jason Gunthorpe 2022-01-28 14:22 ` Jason Gunthorpe 2022-01-28 16:52 ` Logan Gunthorpe 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 ` Logan Gunthorpe 2022-01-28 0:26 ` [PATCH v5 24/24] nvme-pci: allow mmaping the CMB in userspace Logan Gunthorpe 2022-01-28 0:26 ` Logan Gunthorpe 2022-01-31 18:56 ` [PATCH v5 00/24] Userspace P2PDMA with O_DIRECT NVMe devices Jonathan Derrick 2022-01-31 18:56 ` Jonathan Derrick 2022-01-31 19:00 ` Logan Gunthorpe 2022-01-31 19:00 ` Logan Gunthorpe
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