From patchwork Thu Mar 11 23:31:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12133247 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA85CC433DB for ; Thu, 11 Mar 2021 23:32:01 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 45ED164F92 for ; Thu, 11 Mar 2021 23:32:01 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 45ED164F92 Authentication-Results: mail.kernel.org; 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identity=mailfrom; envelope-from=""; helo=ale.deltatee.com; client-ip=204.191.154.188 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615505518-362301 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: Introduce pci_p2pdma_should_map_bus() which is meant to be called by DMA map functions to determine how to map a given p2pdma page. pci_p2pdma_bus_offset() is also added to allow callers to get the bus offset if they need to map the bus address. Signed-off-by: Logan Gunthorpe --- drivers/pci/p2pdma.c | 50 ++++++++++++++++++++++++++++++++++++++ include/linux/pci-p2pdma.h | 11 +++++++++ 2 files changed, 61 insertions(+) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 7f6836732bce..66d16b7eb668 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -912,6 +912,56 @@ void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, } EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs); +/** + * pci_p2pdma_bus_offset - returns the bus offset for a given page + * @page: page to get the offset for + * + * Must be passed a PCI p2pdma page. + */ +u64 pci_p2pdma_bus_offset(struct page *page) +{ + struct pci_p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(page->pgmap); + + WARN_ON(!is_pci_p2pdma_page(page)); + + return p2p_pgmap->bus_offset; +} +EXPORT_SYMBOL_GPL(pci_p2pdma_bus_offset); + +/** + * pci_p2pdma_dma_map_type - determine if a DMA mapping should use the + * bus address, be mapped normally or fail + * @dev: device doing the DMA request + * @pgmap: dev_pagemap structure for the mapping + * + * Returns: + * 1 - if the page should be mapped with a bus address, + * 0 - if the page should be mapped normally through an IOMMU mapping or + * physical address; or + * -1 - if the device should not map the pages and an error should be + * returned + */ +int pci_p2pdma_dma_map_type(struct device *dev, struct dev_pagemap *pgmap) +{ + struct pci_p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(pgmap); + struct pci_dev *client; + + if (!dev_is_pci(dev)) + return -1; + + client = to_pci_dev(dev); + + switch (pci_p2pdma_map_type(p2p_pgmap->provider, client)) { + case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: + return 0; + case PCI_P2PDMA_MAP_BUS_ADDR: + return 1; + default: + return -1; + } +} +EXPORT_SYMBOL_GPL(pci_p2pdma_dma_map_type); + /** * pci_p2pdma_enable_store - parse a configfs/sysfs attribute store * to enable p2pdma diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 8318a97c9c61..3d55ad19f54c 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -34,6 +34,8 @@ 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, int nents, enum dma_data_direction dir, unsigned long attrs); +u64 pci_p2pdma_bus_offset(struct page *page); +int pci_p2pdma_dma_map_type(struct device *dev, struct dev_pagemap *pgmap); int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev, bool *use_p2pdma); ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev, @@ -83,6 +85,15 @@ 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 u64 pci_p2pdma_bus_offset(struct page *page) +{ + return -1; +} +static inline int pci_p2pdma_dma_map_type(struct device *dev, + struct dev_pagemap *pgmap) +{ + return -1; +} static inline int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs)