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Thu, 08 Apr 2021 11:01:43 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1lUY25-0002J3-Ql; Thu, 08 Apr 2021 11:01:29 -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, iommu@lists.linux-foundation.org Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?UTF-8?q?Christian=20K=C3=B6nig?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy , Logan Gunthorpe Date: Thu, 8 Apr 2021 11:01:14 -0600 Message-Id: <20210408170123.8788-8-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210408170123.8788-1-logang@deltatee.com> References: <20210408170123.8788-1-logang@deltatee.com> 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, iommu@lists.linux-foundation.org, sbates@raithlin.com, hch@lst.de, jgg@ziepe.ca, christian.koenig@amd.com, jhubbard@nvidia.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, andrzej.jakowski@intel.com, dave.b.minturn@intel.com, jianxin.xiong@intel.com, ira.weiny@intel.com, robin.murphy@arm.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH 07/16] PCI/P2PDMA: Make pci_p2pdma_map_type() non-static X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210408_180146_872515_00E659E2 X-CRM114-Status: GOOD ( 20.33 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org pci_p2pdma_map_type() will be needed by the dma-iommu map_sg implementation because it will need to determine the mapping type ahead of actually doing the mapping to create the actual iommu mapping. Signed-off-by: Logan Gunthorpe --- drivers/pci/p2pdma.c | 34 +++++++++++++++++++++++----------- include/linux/pci-p2pdma.h | 15 +++++++++++++++ 2 files changed, 38 insertions(+), 11 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index bcb1a6d6119d..38c93f57a941 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -20,13 +20,6 @@ #include #include -enum pci_p2pdma_map_type { - PCI_P2PDMA_MAP_UNKNOWN = 0, - PCI_P2PDMA_MAP_NOT_SUPPORTED, - PCI_P2PDMA_MAP_BUS_ADDR, - PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, -}; - struct pci_p2pdma { struct gen_pool *pool; bool p2pmem_published; @@ -822,13 +815,30 @@ void pci_p2pmem_publish(struct pci_dev *pdev, bool publish) } EXPORT_SYMBOL_GPL(pci_p2pmem_publish); -static enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, - struct device *dev) +/** + * pci_p2pdma_map_type - return the type of mapping that should be used for + * a given device and pgmap + * @pgmap: the pagemap of a page to determine the mapping type for + * @dev: device that is mapping the page + * @dma_attrs: the attributes passed to the dma_map operation -- + * this is so they can be checked to ensure P2PDMA pages were not + * introduced into an incorrect interface (like dma_map_sg). * + * + * Returns one of: + * PCI_P2PDMA_MAP_NOT_SUPPORTED - The mapping should not be done + * PCI_P2PDMA_MAP_BUS_ADDR - The mapping should use the PCI bus address + * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE - The mapping should be done directly + */ +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev, unsigned long dma_attrs) { struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; enum pci_p2pdma_map_type ret; struct pci_dev *client; + WARN_ONCE(!(dma_attrs & __DMA_ATTR_PCI_P2PDMA), + "PCI P2PDMA pages were mapped with dma_map_sg!"); + if (!provider->p2pdma) return PCI_P2PDMA_MAP_NOT_SUPPORTED; @@ -879,7 +889,8 @@ int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, struct pci_p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(sg_page(sg)->pgmap); - switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev)) { + switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev, + __DMA_ATTR_PCI_P2PDMA)) { case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: return dma_map_sg_attrs(dev, sg, nents, dir, attrs); case PCI_P2PDMA_MAP_BUS_ADDR: @@ -904,7 +915,8 @@ void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, { enum pci_p2pdma_map_type map_type; - map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev); + map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev, + __DMA_ATTR_PCI_P2PDMA); if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) dma_unmap_sg_attrs(dev, sg, nents, dir, attrs); diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 8318a97c9c61..a06072ac3a52 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -16,6 +16,13 @@ struct block_device; struct scatterlist; +enum pci_p2pdma_map_type { + PCI_P2PDMA_MAP_UNKNOWN = 0, + PCI_P2PDMA_MAP_NOT_SUPPORTED, + PCI_P2PDMA_MAP_BUS_ADDR, + PCI_P2PDMA_MAP_THRU_HOST_BRIDGE, +}; + #ifdef CONFIG_PCI_P2PDMA int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset); @@ -30,6 +37,8 @@ struct scatterlist *pci_p2pmem_alloc_sgl(struct pci_dev *pdev, unsigned int *nents, u32 length); void pci_p2pmem_free_sgl(struct pci_dev *pdev, struct scatterlist *sgl); void pci_p2pmem_publish(struct pci_dev *pdev, bool publish); +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev, unsigned long dma_attrs); int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs); void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, @@ -83,6 +92,12 @@ static inline void pci_p2pmem_free_sgl(struct pci_dev *pdev, static inline void pci_p2pmem_publish(struct pci_dev *pdev, bool publish) { } +static inline enum pci_p2pdma_map_type pci_p2pdma_map_type( + struct dev_pagemap *pgmap, struct device *dev, + unsigned long dma_attrs) +{ + return PCI_P2PDMA_MAP_NOT_SUPPORTED; +} static inline int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) -- 2.20.1 _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme