From patchwork Thu Sep 16 23:40:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500571 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,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 542ACC4167E for ; Thu, 16 Sep 2021 23:41:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0D0A761108 for ; Thu, 16 Sep 2021 23:41:28 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0D0A761108 Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=RFVdJzEG; spf=pass (imf17.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: rspam06 X-Rspamd-Queue-Id: 51D35F00039F X-Stat-Signature: 8szqxa74nue5ion5u3hmekry8hwggoc7 X-HE-Tag: 1631835674-839113 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: Make use of the third free LSB in scatterlist's page_link on 64bit systems. The extra bit will be used by dma_[un]map_sg_p2pdma() to determine when a given SGL segments dma_address points to a PCI bus address. dma_unmap_sg_p2pdma() will need to perform different cleanup when a segment is marked as P2PDMA. Using this bit requires adding an additional dependency on CONFIG_64BIT to CONFIG_PCI_P2PDMA. This should be acceptable as the majority of P2PDMA use cases are restricted to newer root complexes and roughly require the extra address space for memory BARs used in the transactions. Signed-off-by: Logan Gunthorpe Reviewed-by: John Hubbard Reviewed-by: Jason Gunthorpe Reviewed-by: Chaitanya Kulkarni --- drivers/pci/Kconfig | 2 +- include/linux/scatterlist.h | 50 ++++++++++++++++++++++++++++++++++--- 2 files changed, 47 insertions(+), 5 deletions(-) diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 0c473d75e625..90b4bddb3300 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -163,7 +163,7 @@ config PCI_PASID config PCI_P2PDMA bool "PCI peer-to-peer transfer support" - depends on ZONE_DEVICE + depends on ZONE_DEVICE && 64BIT select GENERIC_ALLOCATOR help Enableѕ drivers to do PCI peer-to-peer transactions to and from diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 266754a55327..e62b1cf6386f 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -64,6 +64,21 @@ struct sg_append_table { #define SG_CHAIN 0x01UL #define SG_END 0x02UL +/* + * bit 2 is the third free bit in the page_link on 64bit systems which + * is used by dma_unmap_sg() to determine if the dma_address is a PCI + * bus address when doing P2PDMA. + * Note: CONFIG_PCI_P2PDMA depends on CONFIG_64BIT because of this. + */ + +#ifdef CONFIG_PCI_P2PDMA +#define SG_DMA_PCI_P2PDMA 0x04UL +#else +#define SG_DMA_PCI_P2PDMA 0x00UL +#endif + +#define SG_PAGE_LINK_MASK (SG_CHAIN | SG_END | SG_DMA_PCI_P2PDMA) + /* * We overload the LSB of the page pointer to indicate whether it's * a valid sg entry, or whether it points to the start of a new scatterlist. @@ -72,7 +87,9 @@ struct sg_append_table { #define sg_is_chain(sg) ((sg)->page_link & SG_CHAIN) #define sg_is_last(sg) ((sg)->page_link & SG_END) #define sg_chain_ptr(sg) \ - ((struct scatterlist *) ((sg)->page_link & ~(SG_CHAIN | SG_END))) + ((struct scatterlist *)((sg)->page_link & ~SG_PAGE_LINK_MASK)) + +#define sg_is_dma_pci_p2pdma(sg) ((sg)->page_link & SG_DMA_PCI_P2PDMA) /** * sg_assign_page - Assign a given page to an SG entry @@ -86,13 +103,13 @@ struct sg_append_table { **/ static inline void sg_assign_page(struct scatterlist *sg, struct page *page) { - unsigned long page_link = sg->page_link & (SG_CHAIN | SG_END); + unsigned long page_link = sg->page_link & SG_PAGE_LINK_MASK; /* * In order for the low bit stealing approach to work, pages * must be aligned at a 32-bit boundary as a minimum. */ - BUG_ON((unsigned long) page & (SG_CHAIN | SG_END)); + BUG_ON((unsigned long)page & SG_PAGE_LINK_MASK); #ifdef CONFIG_DEBUG_SG BUG_ON(sg_is_chain(sg)); #endif @@ -126,7 +143,7 @@ static inline struct page *sg_page(struct scatterlist *sg) #ifdef CONFIG_DEBUG_SG BUG_ON(sg_is_chain(sg)); #endif - return (struct page *)((sg)->page_link & ~(SG_CHAIN | SG_END)); + return (struct page *)((sg)->page_link & ~SG_PAGE_LINK_MASK); } /** @@ -228,6 +245,31 @@ static inline void sg_unmark_end(struct scatterlist *sg) sg->page_link &= ~SG_END; } +/** + * sg_dma_mark_pci_p2pdma - Mark the scatterlist entry for PCI p2pdma + * @sg: SG entryScatterlist + * + * Description: + * Marks the passed in sg entry to indicate that the dma_address is + * a PCI bus address. + **/ +static inline void sg_dma_mark_pci_p2pdma(struct scatterlist *sg) +{ + sg->page_link |= SG_DMA_PCI_P2PDMA; +} + +/** + * sg_unmark_pci_p2pdma - Unmark the scatterlist entry for PCI p2pdma + * @sg: SG entryScatterlist + * + * Description: + * Clears the PCI P2PDMA mark + **/ +static inline void sg_dma_unmark_pci_p2pdma(struct scatterlist *sg) +{ + sg->page_link &= ~SG_DMA_PCI_P2PDMA; +} + /** * sg_phys - Return physical address of an sg entry * @sg: SG entry From patchwork Thu Sep 16 23:40:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500569 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,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 CFA4BC28CD5 for ; 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Thu, 16 Sep 2021 17:41:10 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR103-000Vqs-OU; Thu, 16 Sep 2021 17:41:03 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:42 -0600 Message-Id: <20210916234100.122368-3-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 02/20] PCI/P2PDMA: attempt to set map_type if it has not been set 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-Stat-Signature: ywzuryc1sa9hucbb9y3g7eaea1k8zb7r Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=AtzMXLuO; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf15.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 53100D0000A6 X-HE-Tag: 1631835674-264175 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: 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. With this change it's no longer invalid to call pci_p2pdma_map_sg() before the mapping type is calculated so drop the WARN_ON when that is the case. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas --- drivers/pci/p2pdma.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 50cdde3e9a8b..1192c465ba6d 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, false); + return type; } @@ -906,7 +911,6 @@ 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); return 0; } } From patchwork Thu Sep 16 23:40:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500567 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,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 B8D8FC41535 for ; Thu, 16 Sep 2021 23:41:24 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 6A6A861212 for ; Thu, 16 Sep 2021 23:41:24 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6A6A861212 Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=j76116bs; spf=pass (imf16.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-Stat-Signature: qjj8ufxkoni4hugyrd6x97rkxfhhm44x X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: CD9C8F00009E X-HE-Tag: 1631835672-403442 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: 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 Acked-by: Bjorn Helgaas Reviewed-by: Jason Gunthorpe --- drivers/pci/p2pdma.c | 24 +++++++++++++--------- include/linux/pci-p2pdma.h | 41 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 56 insertions(+), 9 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 1192c465ba6d..b656d8c801a7 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; @@ -841,8 +834,21 @@ 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 + * + * 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 normally + * using the CPU physical address (in dma-direct) or an IOVA + * mapping for the IOMMU. + */ +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev) { enum pci_p2pdma_map_type type = PCI_P2PDMA_MAP_NOT_SUPPORTED; struct pci_dev *provider = to_p2p_pgmap(pgmap)->provider; diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 8318a97c9c61..caac2d023f8f 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -16,6 +16,40 @@ struct block_device; struct scatterlist; +enum pci_p2pdma_map_type { + /* + * PCI_P2PDMA_MAP_UNKNOWN: Used internally for indicating the mapping + * type hasn't been calculated yet. Functions that return this enum + * never return this value. + */ + PCI_P2PDMA_MAP_UNKNOWN = 0, + + /* + * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will + * traverse the host bridge and the host bridge is not in the + * whitelist. DMA Mapping routines should return an error when + * this is returned. + */ + PCI_P2PDMA_MAP_NOT_SUPPORTED, + + /* + * PCI_P2PDMA_BUS_ADDR: Indicates that two devices can talk to + * eachother directly through a PCI switch and the transaction will + * not traverse the host bridge. Such a mapping should program + * the DMA engine with PCI bus addresses. + */ + PCI_P2PDMA_MAP_BUS_ADDR, + + /* + * PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: Indicates two devices can talk + * to eachother, but the transaction traverses a host bridge on the + * whitelist. In this case, a normal mapping either with CPU physical + * addresses (in the case of dma-direct) or IOVA addresses (in the + * case of IOMMUs) should be used to program the DMA engine. + */ + 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 +64,8 @@ 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); 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 +119,11 @@ 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) +{ + 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) From patchwork Thu Sep 16 23:40:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500575 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,USER_AGENT_GIT autolearn=unavailable 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 C4BB2C4332F for ; Thu, 16 Sep 2021 23:41:31 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 61C5161244 for ; 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Thu, 16 Sep 2021 17:41:09 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000Vqy-1g; Thu, 16 Sep 2021 17:41:04 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:44 -0600 Message-Id: <20210916234100.122368-5-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 04/20] PCI/P2PDMA: introduce helpers for dma_map_sg implementations 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-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CA4CBF00020C X-Stat-Signature: yyc6ftuexmpgwjikfp4w1fy5793ek5kg Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=cRhsMdWF; spf=pass (imf11.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-HE-Tag: 1631835672-967297 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: Add pci_p2pdma_map_segment() as a helper for simple dma_map_sg() implementations. It takes an scatterlist segment that must point to a pci_p2pdma struct page and will map it if the mapping requires a bus address. The return value indicates whether the mapping required a bus address or whether the caller still needs to map the segment normally. If the segment should not be mapped, -EREMOTEIO is returned. This helper uses a state structure to track the changes to the pgmap across calls and avoid needing to lookup into the xarray for every page. Also add pci_p2pdma_map_bus_segment() which is useful for IOMMU dma_map_sg() implementations where the sg segment containing the page differs from the sg segment containing the DMA address. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas --- drivers/pci/p2pdma.c | 59 ++++++++++++++++++++++++++++++++++++++ include/linux/pci-p2pdma.h | 21 ++++++++++++++ 2 files changed, 80 insertions(+) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index b656d8c801a7..58c34f1f1473 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -943,6 +943,65 @@ void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, } EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs); +/** + * pci_p2pdma_map_segment - map an sg segment determining the mapping type + * @state: State structure that should be declared outside of the for_each_sg() + * loop and initialized to zero. + * @dev: DMA device that's doing the mapping operation + * @sg: scatterlist segment to map + * + * This is a helper to be used by non-iommu dma_map_sg() implementations where + * the sg segment is the same for the page_link and the dma_address. + * + * Attempt to map a single segment in an SGL with the PCI bus address. + * The segment must point to a PCI P2PDMA page and thus must be + * wrapped in a is_pci_p2pdma_page(sg_page(sg)) check. + * + * Returns the type of mapping used and maps the page if the type is + * PCI_P2PDMA_MAP_BUS_ADDR. + */ +enum pci_p2pdma_map_type +pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, + struct scatterlist *sg) +{ + if (state->pgmap != sg_page(sg)->pgmap) { + state->pgmap = sg_page(sg)->pgmap; + state->map = pci_p2pdma_map_type(state->pgmap, dev); + state->bus_off = to_p2p_pgmap(state->pgmap)->bus_offset; + } + + if (state->map == PCI_P2PDMA_MAP_BUS_ADDR) { + sg->dma_address = sg_phys(sg) + state->bus_off; + sg_dma_len(sg) = sg->length; + sg_dma_mark_pci_p2pdma(sg); + } + + return state->map; +} + +/** + * pci_p2pdma_map_bus_segment - map an sg segment pre determined to + * be mapped with PCI_P2PDMA_MAP_BUS_ADDR + * @pg_sg: scatterlist segment with the page to map + * @dma_sg: scatterlist segment to assign a dma address to + * + * This is a helper for iommu dma_map_sg() implementations when the + * segment for the dma address differs from the segment containing the + * source page. + * + * pci_p2pdma_map_type() must have already been called on the pg_sg and + * returned PCI_P2PDMA_MAP_BUS_ADDR. + */ +void pci_p2pdma_map_bus_segment(struct scatterlist *pg_sg, + struct scatterlist *dma_sg) +{ + struct pci_p2pdma_pagemap *pgmap = to_p2p_pgmap(sg_page(pg_sg)->pgmap); + + dma_sg->dma_address = sg_phys(pg_sg) + pgmap->bus_offset; + sg_dma_len(dma_sg) = pg_sg->length; + sg_dma_mark_pci_p2pdma(dma_sg); +} + /** * 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 caac2d023f8f..e5a8d5bc0f51 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -13,6 +13,12 @@ #include +struct pci_p2pdma_map_state { + struct dev_pagemap *pgmap; + int map; + u64 bus_off; +}; + struct block_device; struct scatterlist; @@ -70,6 +76,11 @@ 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); +enum pci_p2pdma_map_type +pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, + struct scatterlist *sg); +void pci_p2pdma_map_bus_segment(struct scatterlist *pg_sg, + struct scatterlist *dma_sg); 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, @@ -135,6 +146,16 @@ static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev, unsigned long attrs) { } +static inline enum pci_p2pdma_map_type +pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, + struct scatterlist *sg) +{ + return PCI_P2PDMA_MAP_NOT_SUPPORTED; +} +static inline void pci_p2pdma_map_bus_segment(struct scatterlist *pg_sg, + struct scatterlist *dma_sg) +{ +} static inline int pci_p2pdma_enable_store(const char *page, struct pci_dev **p2p_dev, bool *use_p2pdma) { From patchwork Thu Sep 16 23:40:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500591 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,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 AAF16C433EF for ; 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Thu, 16 Sep 2021 17:41:18 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000Vr1-5i; Thu, 16 Sep 2021 17:41:04 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:45 -0600 Message-Id: <20210916234100.122368-6-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 05/20] dma-mapping: allow EREMOTEIO return code for P2PDMA transfers 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-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: C340710000B9 Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=Zs5M0NYf; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf12.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: ug3jwbsf1nkkiariqxmt3iihmgz9qchd X-HE-Tag: 1631835679-790865 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: Add EREMOTEIO error return to dma_map_sgtable() which will be used by .map_sg() implementations that detect P2PDMA pages that the underlying DMA device cannot access. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe --- kernel/dma/mapping.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 7ee5284bff58..7315ae31cf1d 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -197,7 +197,7 @@ static int __dma_map_sg_attrs(struct device *dev, struct scatterlist *sg, if (ents > 0) debug_dma_map_sg(dev, sg, nents, ents, dir); else if (WARN_ON_ONCE(ents != -EINVAL && ents != -ENOMEM && - ents != -EIO)) + ents != -EIO && ents != -EREMOTEIO)) return -EIO; return ents; @@ -248,12 +248,14 @@ EXPORT_SYMBOL(dma_map_sg_attrs); * Returns 0 on success or a negative error code on error. The following * error codes are supported with the given meaning: * - * -EINVAL - An invalid argument, unaligned access or other error - * in usage. Will not succeed if retried. - * -ENOMEM - Insufficient resources (like memory or IOVA space) to - * complete the mapping. Should succeed if retried later. - * -EIO - Legacy error code with an unknown meaning. eg. this is - * returned if a lower level call returned DMA_MAPPING_ERROR. + * -EINVAL - An invalid argument, unaligned access or other error + * in usage. Will not succeed if retried. + * -ENOMEM - Insufficient resources (like memory or IOVA space) to + * complete the mapping. Should succeed if retried later. + * -EIO - Legacy error code with an unknown meaning. eg. this is + * returned if a lower level call returned DMA_MAPPING_ERROR. + * -EREMOTEIO - The DMA device cannot access P2PDMA memory specified in + * the sg_table. This will not succeed if retried. */ int dma_map_sgtable(struct device *dev, struct sg_table *sgt, enum dma_data_direction dir, unsigned long attrs) From patchwork Thu Sep 16 23:40:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500589 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,USER_AGENT_GIT autolearn=unavailable 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 F38C9C4332F for ; Thu, 16 Sep 2021 23:41:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A84B4610C7 for ; 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Thu, 16 Sep 2021 17:41:17 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000Vr4-9z; Thu, 16 Sep 2021 17:41:04 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:46 -0600 Message-Id: <20210916234100.122368-7-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 06/20] dma-direct: support PCI P2PDMA pages in dma-direct map_sg 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) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=Bk9cEz8o; spf=pass (imf13.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-Stat-Signature: rghggz6yehz8uy6ceeqjeuay1jar7c4j X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 3BAD81031225 X-HE-Tag: 1631835679-533754 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: Add PCI P2PDMA support for dma_direct_map_sg() so that it can map PCI P2PDMA pages directly without a hack in the callers. This allows for heterogeneous SGLs that contain both P2PDMA and regular pages. A P2PDMA page may have three possible outcomes when being mapped: 1) If the data path between the two devices doesn't go through the root port, then it should be mapped with a PCI bus address 2) If the data path goes through the host bridge, it should be mapped normally, as though it were a CPU physical address 3) It is not possible for the two devices to communicate and thus the mapping operation should fail (and it will return -EREMOTEIO). SGL segments that contain PCI bus addresses are marked with sg_dma_mark_pci_p2pdma() and are ignored when unmapped. Signed-off-by: Logan Gunthorpe --- kernel/dma/direct.c | 44 ++++++++++++++++++++++++++++++++++++++------ 1 file changed, 38 insertions(+), 6 deletions(-) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index 4c6c5e0635e3..fa8317e8ff44 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -13,6 +13,7 @@ #include #include #include +#include #include "direct.h" /* @@ -421,29 +422,60 @@ void dma_direct_sync_sg_for_cpu(struct device *dev, arch_sync_dma_for_cpu_all(); } +/* + * Unmaps segments, except for ones marked as pci_p2pdma which do not + * require any further action as they contain a bus address. + */ void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs) { struct scatterlist *sg; int i; - for_each_sg(sgl, sg, nents, i) - dma_direct_unmap_page(dev, sg->dma_address, sg_dma_len(sg), dir, - attrs); + for_each_sg(sgl, sg, nents, i) { + if (sg_is_dma_pci_p2pdma(sg)) { + sg_dma_unmark_pci_p2pdma(sg); + } else { + dma_direct_unmap_page(dev, sg->dma_address, + sg_dma_len(sg), dir, attrs); + } + } } #endif int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction dir, unsigned long attrs) { - int i; + struct pci_p2pdma_map_state p2pdma_state = {}; + enum pci_p2pdma_map_type map; struct scatterlist *sg; + int i, ret; for_each_sg(sgl, sg, nents, i) { + if (is_pci_p2pdma_page(sg_page(sg))) { + map = pci_p2pdma_map_segment(&p2pdma_state, dev, sg); + switch (map) { + case PCI_P2PDMA_MAP_BUS_ADDR: + continue; + case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: + /* + * Mapping through host bridge should be + * mapped normally, thus we do nothing + * and continue below. + */ + break; + default: + ret = -EREMOTEIO; + goto out_unmap; + } + } + sg->dma_address = dma_direct_map_page(dev, sg_page(sg), sg->offset, sg->length, dir, attrs); - if (sg->dma_address == DMA_MAPPING_ERROR) + if (sg->dma_address == DMA_MAPPING_ERROR) { + ret = -EIO; goto out_unmap; + } sg_dma_len(sg) = sg->length; } @@ -451,7 +483,7 @@ int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents, out_unmap: dma_direct_unmap_sg(dev, sgl, i, dir, attrs | DMA_ATTR_SKIP_CPU_SYNC); - return -EIO; + return ret; } dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr, From patchwork Thu Sep 16 23:40:47 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500587 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,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 01F17C43219 for ; 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Thu, 16 Sep 2021 17:41:17 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000Vr7-E3; Thu, 16 Sep 2021 17:41:04 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:47 -0600 Message-Id: <20210916234100.122368-8-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 07/20] dma-mapping: add flags to dma_map_ops to indicate PCI P2PDMA support 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-Stat-Signature: 1pyo1o6dab93kptc4xo5stbnbzdczoia Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=US2nbdXe; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf24.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: EF026B0000B9 X-HE-Tag: 1631835678-694656 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: Add a flags member to the dma_map_ops structure with one flag to indicate support for PCI P2PDMA. Also, add a helper to check if a device supports PCI P2PDMA. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe --- include/linux/dma-map-ops.h | 10 ++++++++++ include/linux/dma-mapping.h | 5 +++++ kernel/dma/mapping.c | 18 ++++++++++++++++++ 3 files changed, 33 insertions(+) diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 0d5b06b3a4a6..b60d6870c847 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -11,7 +11,17 @@ struct cma; +/* + * Values for struct dma_map_ops.flags: + * + * DMA_F_PCI_P2PDMA_SUPPORTED: Indicates the dma_map_ops implementation can + * handle PCI P2PDMA pages in the map_sg/unmap_sg operation. + */ +#define DMA_F_PCI_P2PDMA_SUPPORTED (1 << 0) + struct dma_map_ops { + unsigned int flags; + void *(*alloc)(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index dca2b1355bb1..f7c61b2b4b5e 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -140,6 +140,7 @@ int dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, unsigned long attrs); bool dma_can_mmap(struct device *dev); int dma_supported(struct device *dev, u64 mask); +bool dma_pci_p2pdma_supported(struct device *dev); int dma_set_mask(struct device *dev, u64 mask); int dma_set_coherent_mask(struct device *dev, u64 mask); u64 dma_get_required_mask(struct device *dev); @@ -250,6 +251,10 @@ static inline int dma_supported(struct device *dev, u64 mask) { return 0; } +static inline bool dma_pci_p2pdma_supported(struct device *dev) +{ + return false; +} static inline int dma_set_mask(struct device *dev, u64 mask) { return -EIO; diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 7315ae31cf1d..23a02fe1832a 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -727,6 +727,24 @@ int dma_supported(struct device *dev, u64 mask) } EXPORT_SYMBOL(dma_supported); +bool dma_pci_p2pdma_supported(struct device *dev) +{ + const struct dma_map_ops *ops = get_dma_ops(dev); + + /* if ops is not set, dma direct will be used which supports P2PDMA */ + if (!ops) + return true; + + /* + * Note: dma_ops_bypass is not checked here because P2PDMA should + * not be used with dma mapping ops that do not have support even + * if the specific device is bypassing them. + */ + + return ops->flags & DMA_F_PCI_P2PDMA_SUPPORTED; +} +EXPORT_SYMBOL_GPL(dma_pci_p2pdma_supported); + #ifdef CONFIG_ARCH_HAS_DMA_SET_MASK void arch_dma_set_mask(struct device *dev, u64 mask); #else From patchwork Thu Sep 16 23:40:48 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500583 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,USER_AGENT_GIT autolearn=unavailable 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 43870C43217 for ; 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Thu, 16 Sep 2021 17:41:16 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000VrA-Hp; Thu, 16 Sep 2021 17:41:04 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:48 -0600 Message-Id: <20210916234100.122368-9-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 08/20] iommu/dma: support PCI P2PDMA pages in dma-iommu map_sg 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-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 74C90D03001A Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=pDf9MnIP; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf21.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: x6u1q4b1j6agz6bmabnc7zr3uazjgg5r X-HE-Tag: 1631835678-834868 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: When a PCI P2PDMA page is seen, set the IOVA length of the segment to zero so that it is not mapped into the IOVA. Then, in finalise_sg(), apply the appropriate bus address to the segment. The IOVA is not created if the scatterlist only consists of P2PDMA pages. A P2PDMA page may have three possible outcomes when being mapped: 1) If the data path between the two devices doesn't go through the root port, then it should be mapped with a PCI bus address 2) If the data path goes through the host bridge, it should be mapped normally with an IOMMU IOVA. 3) It is not possible for the two devices to communicate and thus the mapping operation should fail (and it will return -EREMOTEIO). Similar to dma-direct, the sg_dma_mark_pci_p2pdma() flag is used to indicate bus address segments. On unmap, P2PDMA segments are skipped over when determining the start and end IOVA addresses. With this change, the flags variable in the dma_map_ops is set to DMA_F_PCI_P2PDMA_SUPPORTED to indicate support for P2PDMA pages. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe --- drivers/iommu/dma-iommu.c | 68 +++++++++++++++++++++++++++++++++++---- 1 file changed, 61 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 896bea04c347..e7c658d04222 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -911,6 +912,16 @@ static int __finalise_sg(struct device *dev, struct scatterlist *sg, int nents, sg_dma_address(s) = DMA_MAPPING_ERROR; sg_dma_len(s) = 0; + if (is_pci_p2pdma_page(sg_page(s)) && !s_iova_len) { + if (i > 0) + cur = sg_next(cur); + + pci_p2pdma_map_bus_segment(s, cur); + count++; + cur_len = 0; + continue; + } + /* * Now fill in the real DMA data. If... * - there is a valid output segment to append to @@ -1008,6 +1019,8 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, struct iova_domain *iovad = &cookie->iovad; struct scatterlist *s, *prev = NULL; int prot = dma_info_to_prot(dir, dev_is_dma_coherent(dev), attrs); + struct dev_pagemap *pgmap = NULL; + enum pci_p2pdma_map_type map_type; dma_addr_t iova; size_t iova_len = 0; unsigned long mask = dma_get_seg_boundary(dev); @@ -1042,6 +1055,35 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, s_length = iova_align(iovad, s_length + s_iova_off); s->length = s_length; + if (is_pci_p2pdma_page(sg_page(s))) { + if (sg_page(s)->pgmap != pgmap) { + pgmap = sg_page(s)->pgmap; + map_type = pci_p2pdma_map_type(pgmap, dev); + } + + switch (map_type) { + case PCI_P2PDMA_MAP_BUS_ADDR: + /* + * A zero length will be ignored by + * iommu_map_sg() and then can be detected + * in __finalise_sg() to actually map the + * bus address. + */ + s->length = 0; + continue; + case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: + /* + * Mapping through host bridge should be + * mapped with regular IOVAs, thus we + * do nothing here and continue below. + */ + break; + default: + ret = -EREMOTEIO; + goto out_restore_sg; + } + } + /* * Due to the alignment of our single IOVA allocation, we can * depend on these assumptions about the segment boundary mask: @@ -1064,6 +1106,9 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, prev = s; } + if (!iova_len) + return __finalise_sg(dev, sg, nents, 0); + iova = iommu_dma_alloc_iova(domain, iova_len, dma_get_mask(dev), dev); if (!iova) { ret = -ENOMEM; @@ -1085,7 +1130,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, out_restore_sg: __invalidate_sg(sg, nents); out: - if (ret != -ENOMEM) + if (ret != -ENOMEM && ret != -EREMOTEIO) return -EINVAL; return ret; } @@ -1093,7 +1138,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir, unsigned long attrs) { - dma_addr_t start, end; + dma_addr_t end, start = DMA_MAPPING_ERROR; struct scatterlist *tmp; int i; @@ -1109,14 +1154,22 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, * The scatterlist segments are mapped into a single * contiguous IOVA allocation, so this is incredibly easy. */ - start = sg_dma_address(sg); - for_each_sg(sg_next(sg), tmp, nents - 1, i) { + for_each_sg(sg, tmp, nents, i) { + if (sg_is_dma_pci_p2pdma(tmp)) { + sg_dma_unmark_pci_p2pdma(tmp); + continue; + } if (sg_dma_len(tmp) == 0) break; - sg = tmp; + + if (start == DMA_MAPPING_ERROR) + start = sg_dma_address(tmp); + + end = sg_dma_address(tmp) + sg_dma_len(tmp); } - end = sg_dma_address(sg) + sg_dma_len(sg); - __iommu_dma_unmap(dev, start, end - start); + + if (start != DMA_MAPPING_ERROR) + __iommu_dma_unmap(dev, start, end - start); } static dma_addr_t iommu_dma_map_resource(struct device *dev, phys_addr_t phys, @@ -1309,6 +1362,7 @@ static unsigned long iommu_dma_get_merge_boundary(struct device *dev) } static const struct dma_map_ops iommu_dma_ops = { + .flags = DMA_F_PCI_P2PDMA_SUPPORTED, .alloc = iommu_dma_alloc, .free = iommu_dma_free, .alloc_pages = dma_common_alloc_pages, From patchwork Thu Sep 16 23:40:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500585 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,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 23EDEC4332F for ; Thu, 16 Sep 2021 23:41:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BF2EC611CA for ; Thu, 16 Sep 2021 23:41:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BF2EC611CA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=deltatee.com Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=raROBzSQ; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf18.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: ror6ajwa9kpyo5sxajskenuc5dcm6h7a X-HE-Tag: 1631835678-833445 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 a supports_pci_p2pdma() operation in nvme_ctrl_ops to replace the fixed NVME_F_PCI_P2PDMA flag such that the dma_map_ops flags can be checked for PCI P2PDMA support. Signed-off-by: Logan Gunthorpe --- drivers/nvme/host/core.c | 3 ++- drivers/nvme/host/nvme.h | 2 +- drivers/nvme/host/pci.c | 11 +++++++++-- 3 files changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 7efb31b87f37..916750a54f60 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3771,7 +3771,8 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid, blk_queue_flag_set(QUEUE_FLAG_STABLE_WRITES, ns->queue); blk_queue_flag_set(QUEUE_FLAG_NONROT, ns->queue); - if (ctrl->ops->flags & NVME_F_PCI_P2PDMA) + if (ctrl->ops->supports_pci_p2pdma && + ctrl->ops->supports_pci_p2pdma(ctrl)) blk_queue_flag_set(QUEUE_FLAG_PCI_P2PDMA, ns->queue); ns->ctrl = ctrl; diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index 9871c0c9374c..fb9bfc52a6d7 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -477,7 +477,6 @@ struct nvme_ctrl_ops { unsigned int flags; #define NVME_F_FABRICS (1 << 0) #define NVME_F_METADATA_SUPPORTED (1 << 1) -#define NVME_F_PCI_P2PDMA (1 << 2) int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val); int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); @@ -485,6 +484,7 @@ struct nvme_ctrl_ops { void (*submit_async_event)(struct nvme_ctrl *ctrl); void (*delete_ctrl)(struct nvme_ctrl *ctrl); int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); + bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl); }; /* diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index b82492cd7503..7d1ef66eac2e 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2874,17 +2874,24 @@ static int nvme_pci_get_address(struct nvme_ctrl *ctrl, char *buf, int size) return snprintf(buf, size, "%s\n", dev_name(&pdev->dev)); } +static bool nvme_pci_supports_pci_p2pdma(struct nvme_ctrl *ctrl) +{ + struct nvme_dev *dev = to_nvme_dev(ctrl); + + return dma_pci_p2pdma_supported(dev->dev); +} + static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { .name = "pcie", .module = THIS_MODULE, - .flags = NVME_F_METADATA_SUPPORTED | - NVME_F_PCI_P2PDMA, + .flags = NVME_F_METADATA_SUPPORTED, .reg_read32 = nvme_pci_reg_read32, .reg_write32 = nvme_pci_reg_write32, .reg_read64 = nvme_pci_reg_read64, .free_ctrl = nvme_pci_free_ctrl, .submit_async_event = nvme_pci_submit_async_event, .get_address = nvme_pci_get_address, + .supports_pci_p2pdma = nvme_pci_supports_pci_p2pdma, }; static int nvme_dev_map(struct nvme_dev *dev) From patchwork Thu Sep 16 23:40:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500581 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,USER_AGENT_GIT autolearn=unavailable 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 5666FC4167B for ; Thu, 16 Sep 2021 23:41:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F1CED610C7 for ; Thu, 16 Sep 2021 23:41:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org F1CED610C7 Authentication-Results: mail.kernel.org; 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Thu, 16 Sep 2021 23:41:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=bG2WEjHjwApZ9lpwaAJ7CW7/QJSgPeVj4XexhMfn49w=; b=UN0Njq/0cgqSXOrej4JVP2gjTt r9MzcV6aO042PV0Lc5hyV3tO6nIu3l9plVWY8HYjLzu0SU0rVdpUPUNEyuigeDzkUxm/x3YOsh7sM ZoUDQX+BIRUKn6g2jmc+VizF3OXl9d+vTPnOre4a+sxRAvd+Ek5LTv3ESZ3hRea1EfAOXhZ4g61yb WkTOUA+J3GTogmiJHYSVTe/+WN/cIN4P03uNGEHhl3NOYiiUnepP70LzYRPjNR/AetzrH6Zi6RzgD utWiwoBMiEL6uDspoMeGMRqAS83fX00G5QLRmTfNaSHDPHK4HXIVgtvFSGRIRCijo7UraLWX/MWay tXQ/6RXQ==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mR10E-0008I0-4X; Thu, 16 Sep 2021 17:41:15 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR104-000VrK-Vb; Thu, 16 Sep 2021 17:41:05 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:50 -0600 Message-Id: <20210916234100.122368-11-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 10/20] nvme-pci: convert to using dma_map_sgtable() 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-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 13CE470000A6 Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b="UN0Njq/0"; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf27.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: c6ykxgahpyj1sn1koeb4fhh41dt44shi X-HE-Tag: 1631835676-69980 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: The dma_map operations now support P2PDMA pages directly. So remove the calls to pci_p2pdma_[un]map_sg_attrs() and replace them with calls to dma_map_sgtable(). dma_map_sgtable() returns more complete error codes than dma_map_sg() and allows differentiating EREMOTEIO errors in case an unsupported P2PDMA transfer is requested. When this happens, return BLK_STS_TARGET so the request isn't retried. Signed-off-by: Logan Gunthorpe Reviewed-by: Max Gurtovoy --- drivers/nvme/host/pci.c | 69 +++++++++++++++++------------------------ 1 file changed, 29 insertions(+), 40 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 7d1ef66eac2e..e2cd73129a88 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -228,11 +228,10 @@ struct nvme_iod { bool use_sgl; int aborted; int npages; /* In the PRP list. 0 means small pool in use */ - int nents; /* Used in scatterlist */ dma_addr_t first_dma; unsigned int dma_len; /* length of single DMA segment mapping */ dma_addr_t meta_dma; - struct scatterlist *sg; + struct sg_table sgt; }; static inline unsigned int nvme_dbbuf_size(struct nvme_dev *dev) @@ -523,7 +522,7 @@ static void nvme_commit_rqs(struct blk_mq_hw_ctx *hctx) static void **nvme_pci_iod_list(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - return (void **)(iod->sg + blk_rq_nr_phys_segments(req)); + return (void **)(iod->sgt.sgl + blk_rq_nr_phys_segments(req)); } static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) @@ -575,17 +574,6 @@ static void nvme_free_sgls(struct nvme_dev *dev, struct request *req) } } -static void nvme_unmap_sg(struct nvme_dev *dev, struct request *req) -{ - struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - - if (is_pci_p2pdma_page(sg_page(iod->sg))) - pci_p2pdma_unmap_sg(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req)); - else - dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); -} - static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); @@ -596,9 +584,10 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) return; } - WARN_ON_ONCE(!iod->nents); + WARN_ON_ONCE(!iod->sgt.nents); + + dma_unmap_sgtable(dev->dev, &iod->sgt, rq_dma_dir(req), 0); - nvme_unmap_sg(dev, req); if (iod->npages == 0) dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], iod->first_dma); @@ -606,7 +595,7 @@ static void nvme_unmap_data(struct nvme_dev *dev, struct request *req) nvme_free_sgls(dev, req); else nvme_free_prps(dev, req); - mempool_free(iod->sg, dev->iod_mempool); + mempool_free(iod->sgt.sgl, dev->iod_mempool); } static void nvme_print_sgl(struct scatterlist *sgl, int nents) @@ -629,7 +618,7 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct dma_pool *pool; int length = blk_rq_payload_bytes(req); - struct scatterlist *sg = iod->sg; + struct scatterlist *sg = iod->sgt.sgl; int dma_len = sg_dma_len(sg); u64 dma_addr = sg_dma_address(sg); int offset = dma_addr & (NVME_CTRL_PAGE_SIZE - 1); @@ -702,16 +691,16 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, dma_len = sg_dma_len(sg); } done: - cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sgt.sgl)); cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); return BLK_STS_OK; free_prps: nvme_free_prps(dev, req); return BLK_STS_RESOURCE; bad_sgl: - WARN(DO_ONCE(nvme_print_sgl, iod->sg, iod->nents), + WARN(DO_ONCE(nvme_print_sgl, iod->sgt.sgl, iod->sgt.nents), "Invalid SGL for payload:%d nents:%d\n", - blk_rq_payload_bytes(req), iod->nents); + blk_rq_payload_bytes(req), iod->sgt.nents); return BLK_STS_IOERR; } @@ -737,12 +726,13 @@ static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, } static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, - struct request *req, struct nvme_rw_command *cmd, int entries) + struct request *req, struct nvme_rw_command *cmd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct dma_pool *pool; struct nvme_sgl_desc *sg_list; - struct scatterlist *sg = iod->sg; + struct scatterlist *sg = iod->sgt.sgl; + int entries = iod->sgt.nents; dma_addr_t sgl_dma; int i = 0; @@ -840,7 +830,7 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); blk_status_t ret = BLK_STS_RESOURCE; - int nr_mapped; + int rc; if (blk_rq_nr_phys_segments(req) == 1) { struct bio_vec bv = req_bvec(req); @@ -858,26 +848,25 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, } iod->dma_len = 0; - iod->sg = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); - if (!iod->sg) + iod->sgt.sgl = mempool_alloc(dev->iod_mempool, GFP_ATOMIC); + if (!iod->sgt.sgl) return BLK_STS_RESOURCE; - sg_init_table(iod->sg, blk_rq_nr_phys_segments(req)); - iod->nents = blk_rq_map_sg(req->q, req, iod->sg); - if (!iod->nents) + sg_init_table(iod->sgt.sgl, blk_rq_nr_phys_segments(req)); + iod->sgt.orig_nents = blk_rq_map_sg(req->q, req, iod->sgt.sgl); + if (!iod->sgt.orig_nents) goto out_free_sg; - if (is_pci_p2pdma_page(sg_page(iod->sg))) - nr_mapped = pci_p2pdma_map_sg_attrs(dev->dev, iod->sg, - iod->nents, rq_dma_dir(req), DMA_ATTR_NO_WARN); - else - nr_mapped = dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req), DMA_ATTR_NO_WARN); - if (!nr_mapped) + rc = dma_map_sgtable(dev->dev, &iod->sgt, rq_dma_dir(req), + DMA_ATTR_NO_WARN); + if (rc) { + if (rc == -EREMOTEIO) + ret = BLK_STS_TARGET; goto out_free_sg; + } iod->use_sgl = nvme_pci_use_sgls(dev, req); if (iod->use_sgl) - ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw, nr_mapped); + ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw); else ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); if (ret != BLK_STS_OK) @@ -885,9 +874,9 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, return BLK_STS_OK; out_unmap_sg: - nvme_unmap_sg(dev, req); + dma_unmap_sgtable(dev->dev, &iod->sgt, rq_dma_dir(req), 0); out_free_sg: - mempool_free(iod->sg, dev->iod_mempool); + mempool_free(iod->sgt.sgl, dev->iod_mempool); return ret; } @@ -920,7 +909,7 @@ static blk_status_t nvme_queue_rq(struct blk_mq_hw_ctx *hctx, iod->aborted = 0; iod->npages = -1; - iod->nents = 0; + iod->sgt.nents = 0; /* * We should not need to do this, but we're still using this to From patchwork Thu Sep 16 23:40:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500579 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,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 9A505C28CB0 for ; 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Thu, 16 Sep 2021 17:41:14 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR105-000VrO-5X; Thu, 16 Sep 2021 17:41:05 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:51 -0600 Message-Id: <20210916234100.122368-12-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 11/20] RDMA/core: introduce ib_dma_pci_p2p_dma_supported() 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-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: E273F10000BD Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=Vmzky1ij; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf12.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: jbzxs4tuidch3nfc51sigpnscmwp8m6b X-HE-Tag: 1631835676-757447 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 the helper function ib_dma_pci_p2p_dma_supported() to check if a given ib_device can be used in P2PDMA transfers. This ensures the ib_device is not using virt_dma and also that the underlying dma_device supports P2PDMA. Use the new helper in nvme-rdma to replace the existing check for ib_uses_virt_dma(). Adding the dma_pci_p2pdma_supported() check allows switching away from pci_p2pdma_[un]map_sg(). Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Max Gurtovoy --- drivers/nvme/target/rdma.c | 2 +- include/rdma/ib_verbs.h | 11 +++++++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 891174ccd44b..9ea212c187f2 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -414,7 +414,7 @@ static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev, if (ib_dma_mapping_error(ndev->device, r->send_sge.addr)) goto out_free_rsp; - if (!ib_uses_virt_dma(ndev->device)) + if (ib_dma_pci_p2p_dma_supported(ndev->device)) r->req.p2p_client = &ndev->device->dev; r->send_sge.length = sizeof(*r->req.cqe); r->send_sge.lkey = ndev->pd->local_dma_lkey; diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 4b50d9a3018a..2b71c9ca2186 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -3986,6 +3986,17 @@ static inline bool ib_uses_virt_dma(struct ib_device *dev) return IS_ENABLED(CONFIG_INFINIBAND_VIRT_DMA) && !dev->dma_device; } +/* + * Check if a IB device's underlying DMA mapping supports P2PDMA transfers. + */ +static inline bool ib_dma_pci_p2p_dma_supported(struct ib_device *dev) +{ + if (ib_uses_virt_dma(dev)) + return false; + + return dma_pci_p2pdma_supported(dev->dma_device); +} + /** * ib_dma_mapping_error - check a DMA addr for error * @dev: The device for which the dma_addr was created From patchwork Thu Sep 16 23:40:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500577 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,USER_AGENT_GIT autolearn=unavailable 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 AE8D7C28CAC for ; 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Thu, 16 Sep 2021 17:41:13 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR105-000VrS-BF; Thu, 16 Sep 2021 17:41:05 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:52 -0600 Message-Id: <20210916234100.122368-13-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 12/20] RDMA/rw: use dma_map_sgtable() 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-Stat-Signature: h974gd853epb8d6dwqx58x9wxiii9cqc Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=dI2wFqH8; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf30.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 3F5C6E0016B0 X-HE-Tag: 1631835676-606399 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: dma_map_sg() now supports the use of P2PDMA pages so pci_p2pdma_map_sg() is no longer necessary and may be dropped. Switch to the dma_map_sgtable() interface which will allow for better error reporting if the P2PDMA pages are unsupported. The change to sgtable also appears to fix a couple subtle error path bugs: - In rdma_rw_ctx_init(), dma_unmap would be called with an sg that could have been incremented from the original call, as well as an nents that was not the original number of nents called when mapped. - Similarly in rdma_rw_ctx_signature_init, both sg and prot_sg were unmapped with the incorrect number of nents. Signed-off-by: Logan Gunthorpe Reviewed-by: Jason Gunthorpe Reviewed-by: Max Gurtovoy --- drivers/infiniband/core/rw.c | 75 +++++++++++++++--------------------- include/rdma/ib_verbs.h | 19 +++++++++ 2 files changed, 51 insertions(+), 43 deletions(-) diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index 5221cce65675..1bdb56380764 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -273,26 +273,6 @@ static int rdma_rw_init_single_wr(struct rdma_rw_ctx *ctx, struct ib_qp *qp, return 1; } -static void rdma_rw_unmap_sg(struct ib_device *dev, struct scatterlist *sg, - u32 sg_cnt, enum dma_data_direction dir) -{ - if (is_pci_p2pdma_page(sg_page(sg))) - pci_p2pdma_unmap_sg(dev->dma_device, sg, sg_cnt, dir); - else - ib_dma_unmap_sg(dev, sg, sg_cnt, dir); -} - -static int rdma_rw_map_sg(struct ib_device *dev, struct scatterlist *sg, - u32 sg_cnt, enum dma_data_direction dir) -{ - if (is_pci_p2pdma_page(sg_page(sg))) { - if (WARN_ON_ONCE(ib_uses_virt_dma(dev))) - return 0; - return pci_p2pdma_map_sg(dev->dma_device, sg, sg_cnt, dir); - } - return ib_dma_map_sg(dev, sg, sg_cnt, dir); -} - /** * rdma_rw_ctx_init - initialize a RDMA READ/WRITE context * @ctx: context to initialize @@ -313,12 +293,16 @@ int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num, u64 remote_addr, u32 rkey, enum dma_data_direction dir) { struct ib_device *dev = qp->pd->device; + struct sg_table sgt = { + .sgl = sg, + .orig_nents = sg_cnt, + }; int ret; - ret = rdma_rw_map_sg(dev, sg, sg_cnt, dir); - if (!ret) - return -ENOMEM; - sg_cnt = ret; + ret = ib_dma_map_sgtable(dev, &sgt, dir, 0); + if (ret) + return ret; + sg_cnt = sgt.nents; /* * Skip to the S/G entry that sg_offset falls into: @@ -354,7 +338,7 @@ int rdma_rw_ctx_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u32 port_num, return ret; out_unmap_sg: - rdma_rw_unmap_sg(dev, sg, sg_cnt, dir); + ib_dma_unmap_sgtable(dev, &sgt, dir, 0); return ret; } EXPORT_SYMBOL(rdma_rw_ctx_init); @@ -387,6 +371,14 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, qp->integrity_en); struct ib_rdma_wr *rdma_wr; int count = 0, ret; + struct sg_table sgt = { + .sgl = sg, + .orig_nents = sg_cnt, + }; + struct sg_table prot_sgt = { + .sgl = prot_sg, + .orig_nents = prot_sg_cnt, + }; if (sg_cnt > pages_per_mr || prot_sg_cnt > pages_per_mr) { pr_err("SG count too large: sg_cnt=%u, prot_sg_cnt=%u, pages_per_mr=%u\n", @@ -394,18 +386,14 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, return -EINVAL; } - ret = rdma_rw_map_sg(dev, sg, sg_cnt, dir); - if (!ret) - return -ENOMEM; - sg_cnt = ret; + ret = ib_dma_map_sgtable(dev, &sgt, dir, 0); + if (ret) + return ret; if (prot_sg_cnt) { - ret = rdma_rw_map_sg(dev, prot_sg, prot_sg_cnt, dir); - if (!ret) { - ret = -ENOMEM; + ret = ib_dma_map_sgtable(dev, &prot_sgt, dir, 0); + if (ret) goto out_unmap_sg; - } - prot_sg_cnt = ret; } ctx->type = RDMA_RW_SIG_MR; @@ -426,10 +414,11 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, memcpy(ctx->reg->mr->sig_attrs, sig_attrs, sizeof(struct ib_sig_attrs)); - ret = ib_map_mr_sg_pi(ctx->reg->mr, sg, sg_cnt, NULL, prot_sg, - prot_sg_cnt, NULL, SZ_4K); + ret = ib_map_mr_sg_pi(ctx->reg->mr, sg, sgt.nents, NULL, prot_sg, + prot_sgt.nents, NULL, SZ_4K); if (unlikely(ret)) { - pr_err("failed to map PI sg (%u)\n", sg_cnt + prot_sg_cnt); + pr_err("failed to map PI sg (%u)\n", + sgt.nents + prot_sgt.nents); goto out_destroy_sig_mr; } @@ -468,10 +457,10 @@ int rdma_rw_ctx_signature_init(struct rdma_rw_ctx *ctx, struct ib_qp *qp, out_free_ctx: kfree(ctx->reg); out_unmap_prot_sg: - if (prot_sg_cnt) - rdma_rw_unmap_sg(dev, prot_sg, prot_sg_cnt, dir); + if (prot_sgt.nents) + ib_dma_unmap_sgtable(dev, &prot_sgt, dir, 0); out_unmap_sg: - rdma_rw_unmap_sg(dev, sg, sg_cnt, dir); + ib_dma_unmap_sgtable(dev, &sgt, dir, 0); return ret; } EXPORT_SYMBOL(rdma_rw_ctx_signature_init); @@ -604,7 +593,7 @@ void rdma_rw_ctx_destroy(struct rdma_rw_ctx *ctx, struct ib_qp *qp, break; } - rdma_rw_unmap_sg(qp->pd->device, sg, sg_cnt, dir); + ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir); } EXPORT_SYMBOL(rdma_rw_ctx_destroy); @@ -632,8 +621,8 @@ void rdma_rw_ctx_destroy_signature(struct rdma_rw_ctx *ctx, struct ib_qp *qp, kfree(ctx->reg); if (prot_sg_cnt) - rdma_rw_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir); - rdma_rw_unmap_sg(qp->pd->device, sg, sg_cnt, dir); + ib_dma_unmap_sg(qp->pd->device, prot_sg, prot_sg_cnt, dir); + ib_dma_unmap_sg(qp->pd->device, sg, sg_cnt, dir); } EXPORT_SYMBOL(rdma_rw_ctx_destroy_signature); diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 2b71c9ca2186..d04f07ab4d1a 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -4096,6 +4096,25 @@ static inline void ib_dma_unmap_sg_attrs(struct ib_device *dev, dma_attrs); } +static inline int ib_dma_map_sgtable(struct ib_device *dev, + struct sg_table *sgt, + enum dma_data_direction direction, + unsigned long dma_attrs) +{ + if (ib_uses_virt_dma(dev)) + return ib_dma_virt_map_sg(dev, sgt->sgl, sgt->orig_nents); + return dma_map_sgtable(dev->dma_device, sgt, direction, dma_attrs); +} + +static inline void ib_dma_unmap_sgtable(struct ib_device *dev, + struct sg_table *sgt, + enum dma_data_direction direction, + unsigned long dma_attrs) +{ + if (!ib_uses_virt_dma(dev)) + dma_unmap_sgtable(dev->dma_device, sgt, direction, dma_attrs); +} + /** * ib_dma_map_sgtable_attrs - Map a scatter/gather table to DMA addresses * @dev: The device for which the DMA addresses are to be created From patchwork Thu Sep 16 23:40:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500643 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=-16.5 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 CB82AC433EF for ; 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Thu, 16 Sep 2021 17:41:13 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR105-000VrW-I0; Thu, 16 Sep 2021 17:41:05 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:53 -0600 Message-Id: <20210916234100.122368-14-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 13/20] PCI/P2PDMA: remove pci_p2pdma_[un]map_sg() 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-Stat-Signature: zx3k5yo5qc1js3bs4j3meqq3ckqxoh31 Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b="tppHiAI/"; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf30.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 4351DE001985 X-HE-Tag: 1631837022-682562 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: This interface is superseded by support in dma_map_sg() which now supports heterogeneous scatterlists. There are no longer any users, so remove it. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas Reviewed-by: Jason Gunthorpe Reviewed-by: Max Gurtovoy --- drivers/pci/p2pdma.c | 65 -------------------------------------- include/linux/pci-p2pdma.h | 27 ---------------- 2 files changed, 92 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 58c34f1f1473..4478633346bd 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -878,71 +878,6 @@ enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, return type; } -static int __pci_p2pdma_map_sg(struct pci_p2pdma_pagemap *p2p_pgmap, - struct device *dev, struct scatterlist *sg, int nents) -{ - struct scatterlist *s; - int i; - - for_each_sg(sg, s, nents, i) { - s->dma_address = sg_phys(s) - p2p_pgmap->bus_offset; - sg_dma_len(s) = s->length; - } - - return nents; -} - -/** - * pci_p2pdma_map_sg_attrs - map a PCI peer-to-peer scatterlist for DMA - * @dev: device doing the DMA request - * @sg: scatter list to map - * @nents: elements in the scatterlist - * @dir: DMA direction - * @attrs: DMA attributes passed to dma_map_sg() (if called) - * - * Scatterlists mapped with this function should be unmapped using - * pci_p2pdma_unmap_sg_attrs(). - * - * Returns the number of SG entries mapped or 0 on error. - */ -int pci_p2pdma_map_sg_attrs(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - struct pci_p2pdma_pagemap *p2p_pgmap = - to_p2p_pgmap(sg_page(sg)->pgmap); - - switch (pci_p2pdma_map_type(sg_page(sg)->pgmap, dev)) { - case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE: - return dma_map_sg_attrs(dev, sg, nents, dir, attrs); - case PCI_P2PDMA_MAP_BUS_ADDR: - return __pci_p2pdma_map_sg(p2p_pgmap, dev, sg, nents); - default: - return 0; - } -} -EXPORT_SYMBOL_GPL(pci_p2pdma_map_sg_attrs); - -/** - * pci_p2pdma_unmap_sg_attrs - unmap a PCI peer-to-peer scatterlist that was - * mapped with pci_p2pdma_map_sg() - * @dev: device doing the DMA request - * @sg: scatter list to map - * @nents: number of elements returned by pci_p2pdma_map_sg() - * @dir: DMA direction - * @attrs: DMA attributes passed to dma_unmap_sg() (if called) - */ -void pci_p2pdma_unmap_sg_attrs(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir, unsigned long attrs) -{ - enum pci_p2pdma_map_type map_type; - - map_type = pci_p2pdma_map_type(sg_page(sg)->pgmap, dev); - - if (map_type == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE) - dma_unmap_sg_attrs(dev, sg, nents, dir, attrs); -} -EXPORT_SYMBOL_GPL(pci_p2pdma_unmap_sg_attrs); - /** * pci_p2pdma_map_segment - map an sg segment determining the mapping type * @state: State structure that should be declared outside of the for_each_sg() diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index e5a8d5bc0f51..0c33a40a86e7 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -72,10 +72,6 @@ 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); -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); enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, struct scatterlist *sg); @@ -135,17 +131,6 @@ pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct device *dev) { 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) -{ - return 0; -} -static inline void pci_p2pdma_unmap_sg_attrs(struct device *dev, - struct scatterlist *sg, int nents, enum dma_data_direction dir, - unsigned long attrs) -{ -} static inline enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, struct scatterlist *sg) @@ -181,16 +166,4 @@ static inline struct pci_dev *pci_p2pmem_find(struct device *client) return pci_p2pmem_find_many(&client, 1); } -static inline int pci_p2pdma_map_sg(struct device *dev, struct scatterlist *sg, - int nents, enum dma_data_direction dir) -{ - return pci_p2pdma_map_sg_attrs(dev, sg, nents, dir, 0); -} - -static inline void pci_p2pdma_unmap_sg(struct device *dev, - struct scatterlist *sg, int nents, enum dma_data_direction dir) -{ - pci_p2pdma_unmap_sg_attrs(dev, sg, nents, dir, 0); -} - #endif /* _LINUX_PCI_P2P_H */ From patchwork Thu Sep 16 23:40:54 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500559 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,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 D9770C433F5 for ; Thu, 16 Sep 2021 23:41:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 73F4D6120D for ; Thu, 16 Sep 2021 23:41:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 73F4D6120D Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=L1A8epd4; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf05.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Stat-Signature: 5553jk3qy47auntdbqmozjhqmf1o437a X-HE-Tag: 1631835674-193139 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: Callers that expect PCI P2PDMA pages can now set FOLL_PCI_P2PDMA to allow obtaining P2PDMA pages. If a caller does not set this flag and tries to map P2PDMA pages it will fail. This is implemented by adding a flag and a check to get_dev_pagemap(). Signed-off-by: Logan Gunthorpe --- drivers/dax/super.c | 7 ++++--- include/linux/memremap.h | 4 ++-- include/linux/mm.h | 1 + mm/gup.c | 28 +++++++++++++++++----------- mm/huge_memory.c | 8 ++++---- mm/memory-failure.c | 4 ++-- mm/memory_hotplug.c | 2 +- mm/memremap.c | 14 ++++++++++---- 8 files changed, 41 insertions(+), 27 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index fc89e91beea7..ffb6e57e65bb 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -180,9 +180,10 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, } else if (pfn_t_devmap(pfn) && pfn_t_devmap(end_pfn)) { struct dev_pagemap *pgmap, *end_pgmap; - pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL); - end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL); - if (pgmap && pgmap == end_pgmap && pgmap->type == MEMORY_DEVICE_FS_DAX + pgmap = get_dev_pagemap(pfn_t_to_pfn(pfn), NULL, false); + end_pgmap = get_dev_pagemap(pfn_t_to_pfn(end_pfn), NULL, false); + if (!IS_ERR_OR_NULL(pgmap) && pgmap == end_pgmap + && pgmap->type == MEMORY_DEVICE_FS_DAX && pfn_t_to_page(pfn)->pgmap == pgmap && pfn_t_to_page(end_pfn)->pgmap == pgmap && pfn_t_to_pfn(pfn) == PHYS_PFN(__pa(kaddr)) diff --git a/include/linux/memremap.h b/include/linux/memremap.h index c0e9d35889e8..f10c332dac8b 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -136,7 +136,7 @@ void memunmap_pages(struct dev_pagemap *pgmap); void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap); void devm_memunmap_pages(struct device *dev, struct dev_pagemap *pgmap); struct dev_pagemap *get_dev_pagemap(unsigned long pfn, - struct dev_pagemap *pgmap); + struct dev_pagemap *pgmap, bool allow_pci_p2pdma); bool pgmap_pfn_valid(struct dev_pagemap *pgmap, unsigned long pfn); unsigned long vmem_altmap_offset(struct vmem_altmap *altmap); @@ -161,7 +161,7 @@ static inline void devm_memunmap_pages(struct device *dev, } static inline struct dev_pagemap *get_dev_pagemap(unsigned long pfn, - struct dev_pagemap *pgmap) + struct dev_pagemap *pgmap, bool allow_pci_p2pdma) { return NULL; } diff --git a/include/linux/mm.h b/include/linux/mm.h index 73a52aba448f..6afdc09d0712 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2864,6 +2864,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address, #define FOLL_SPLIT_PMD 0x20000 /* split huge pmd before returning */ #define FOLL_PIN 0x40000 /* pages must be released via unpin_user_page */ #define FOLL_FAST_ONLY 0x80000 /* gup_fast: prevent fall-back to slow gup */ +#define FOLL_PCI_P2PDMA 0x100000 /* allow returning PCI P2PDMA pages */ /* * FOLL_PIN and FOLL_LONGTERM may be used in various combinations with each diff --git a/mm/gup.c b/mm/gup.c index 886d6148d3d0..1a03b9200cd9 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -522,11 +522,16 @@ static struct page *follow_page_pte(struct vm_area_struct *vma, * case since they are only valid while holding the pgmap * reference. */ - *pgmap = get_dev_pagemap(pte_pfn(pte), *pgmap); - if (*pgmap) + *pgmap = get_dev_pagemap(pte_pfn(pte), *pgmap, + flags & FOLL_PCI_P2PDMA); + if (IS_ERR(*pgmap)) { + page = ERR_CAST(*pgmap); + goto out; + } else if (*pgmap) { page = pte_page(pte); - else + } else { goto no_page; + } } else if (unlikely(!page)) { if (flags & FOLL_DUMP) { /* Avoid special (like zero) pages in core dumps */ @@ -846,7 +851,7 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address, return NULL; page = follow_page_mask(vma, address, foll_flags, &ctx); - if (ctx.pgmap) + if (!IS_ERR_OR_NULL(ctx.pgmap)) put_dev_pagemap(ctx.pgmap); return page; } @@ -1199,7 +1204,7 @@ static long __get_user_pages(struct mm_struct *mm, nr_pages -= page_increm; } while (nr_pages); out: - if (ctx.pgmap) + if (!IS_ERR_OR_NULL(ctx.pgmap)) put_dev_pagemap(ctx.pgmap); return i ? i : ret; } @@ -2149,8 +2154,9 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, if (unlikely(flags & FOLL_LONGTERM)) goto pte_unmap; - pgmap = get_dev_pagemap(pte_pfn(pte), pgmap); - if (unlikely(!pgmap)) { + pgmap = get_dev_pagemap(pte_pfn(pte), pgmap, + flags & FOLL_PCI_P2PDMA); + if (IS_ERR_OR_NULL(pgmap)) { undo_dev_pagemap(nr, nr_start, flags, pages); goto pte_unmap; } @@ -2198,7 +2204,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, ret = 1; pte_unmap: - if (pgmap) + if (!IS_ERR_OR_NULL(pgmap)) put_dev_pagemap(pgmap); pte_unmap(ptem); return ret; @@ -2233,8 +2239,8 @@ static int __gup_device_huge(unsigned long pfn, unsigned long addr, do { struct page *page = pfn_to_page(pfn); - pgmap = get_dev_pagemap(pfn, pgmap); - if (unlikely(!pgmap)) { + pgmap = get_dev_pagemap(pfn, pgmap, flags & FOLL_PCI_P2PDMA); + if (IS_ERR_OR_NULL(pgmap)) { undo_dev_pagemap(nr, nr_start, flags, pages); ret = 0; break; @@ -2708,7 +2714,7 @@ static int internal_get_user_pages_fast(unsigned long start, if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM | FOLL_FORCE | FOLL_PIN | FOLL_GET | - FOLL_FAST_ONLY))) + FOLL_FAST_ONLY | FOLL_PCI_P2PDMA))) return -EINVAL; if (gup_flags & FOLL_PIN) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 5e9ef0fc261e..853157a84b00 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1014,8 +1014,8 @@ struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr, return ERR_PTR(-EEXIST); pfn += (addr & ~PMD_MASK) >> PAGE_SHIFT; - *pgmap = get_dev_pagemap(pfn, *pgmap); - if (!*pgmap) + *pgmap = get_dev_pagemap(pfn, *pgmap, flags & FOLL_PCI_P2PDMA); + if (IS_ERR_OR_NULL(*pgmap)) return ERR_PTR(-EFAULT); page = pfn_to_page(pfn); if (!try_grab_page(page, flags)) @@ -1181,8 +1181,8 @@ struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr, return ERR_PTR(-EEXIST); pfn += (addr & ~PUD_MASK) >> PAGE_SHIFT; - *pgmap = get_dev_pagemap(pfn, *pgmap); - if (!*pgmap) + *pgmap = get_dev_pagemap(pfn, *pgmap, flags & FOLL_PCI_P2PDMA); + if (IS_ERR_OR_NULL(*pgmap)) return ERR_PTR(-EFAULT); page = pfn_to_page(pfn); if (!try_grab_page(page, flags)) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 54879c339024..8f15ccce5aea 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1635,8 +1635,8 @@ int memory_failure(unsigned long pfn, int flags) p = pfn_to_online_page(pfn); if (!p) { if (pfn_valid(pfn)) { - pgmap = get_dev_pagemap(pfn, NULL); - if (pgmap) + pgmap = get_dev_pagemap(pfn, NULL, false); + if (!IS_ERR_OR_NULL(pgmap)) return memory_failure_dev_pagemap(pfn, flags, pgmap); } diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 9fd0be32a281..fa5cf8898b6b 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -285,7 +285,7 @@ struct page *pfn_to_online_page(unsigned long pfn) * the section may be 'offline' but 'valid'. Only * get_dev_pagemap() can determine sub-section online status. */ - pgmap = get_dev_pagemap(pfn, NULL); + pgmap = get_dev_pagemap(pfn, NULL, true); put_dev_pagemap(pgmap); /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */ diff --git a/mm/memremap.c b/mm/memremap.c index ed593bf87109..ceebdb8a72bb 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -206,14 +206,14 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params, "altmap not supported for multiple ranges\n")) return -EINVAL; - conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->start), NULL); + conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->start), NULL, true); if (conflict_pgmap) { WARN(1, "Conflicting mapping in same section\n"); put_dev_pagemap(conflict_pgmap); return -ENOMEM; } - conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->end), NULL); + conflict_pgmap = get_dev_pagemap(PHYS_PFN(range->end), NULL, true); if (conflict_pgmap) { WARN(1, "Conflicting mapping in same section\n"); put_dev_pagemap(conflict_pgmap); @@ -465,19 +465,20 @@ void vmem_altmap_free(struct vmem_altmap *altmap, unsigned long nr_pfns) * get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn * @pfn: page frame number to lookup page_map * @pgmap: optional known pgmap that already has a reference + * @allow_pci_p2pdma: allow getting a pgmap with the PCI P2PDMA type * * If @pgmap is non-NULL and covers @pfn it will be returned as-is. If @pgmap * is non-NULL but does not cover @pfn the reference to it will be released. */ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, - struct dev_pagemap *pgmap) + struct dev_pagemap *pgmap, bool allow_pci_p2pdma) { resource_size_t phys = PFN_PHYS(pfn); /* * In the cached case we're already holding a live reference. */ - if (pgmap) { + if (!IS_ERR_OR_NULL(pgmap)) { if (phys >= pgmap->range.start && phys <= pgmap->range.end) return pgmap; put_dev_pagemap(pgmap); @@ -490,6 +491,11 @@ struct dev_pagemap *get_dev_pagemap(unsigned long pfn, pgmap = NULL; rcu_read_unlock(); + if (!allow_pci_p2pdma && pgmap->type == MEMORY_DEVICE_PCI_P2PDMA) { + put_dev_pagemap(pgmap); + return ERR_PTR(-EREMOTEIO); + } + return pgmap; } EXPORT_SYMBOL_GPL(get_dev_pagemap); From patchwork Thu Sep 16 23:40:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500573 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,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 12773C433EF for ; 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Thu, 16 Sep 2021 17:41:12 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR105-000Vre-So; Thu, 16 Sep 2021 17:41:05 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:55 -0600 Message-Id: <20210916234100.122368-16-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 15/20] iov_iter: introduce iov_iter_get_pages_[alloc_]flags() 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-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: D85D96001987 X-Stat-Signature: 641kd4d4ykrttrp66dagswfrwzjq6xnc Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=rHiKsZcH; spf=pass (imf14.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-HE-Tag: 1631835673-145655 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: Add iov_iter_get_pages_flags() and iov_iter_get_pages_alloc_flags() which take a flags argument that is passed to get_user_pages_fast(). This is so that FOLL_PCI_P2PDMA can be passed when appropriate. Signed-off-by: Logan Gunthorpe --- include/linux/uio.h | 21 +++++++++++++++++---- lib/iov_iter.c | 28 ++++++++++++++++------------ 2 files changed, 33 insertions(+), 16 deletions(-) diff --git a/include/linux/uio.h b/include/linux/uio.h index 5265024e8b90..d4ce252db728 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -228,10 +228,23 @@ void iov_iter_pipe(struct iov_iter *i, unsigned int direction, struct pipe_inode void iov_iter_discard(struct iov_iter *i, unsigned int direction, size_t count); void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray, loff_t start, size_t count); -ssize_t iov_iter_get_pages(struct iov_iter *i, struct page **pages, - size_t maxsize, unsigned maxpages, size_t *start); -ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, struct page ***pages, - size_t maxsize, size_t *start); +ssize_t iov_iter_get_pages_flags(struct iov_iter *i, struct page **pages, + size_t maxsize, unsigned maxpages, size_t *start, + unsigned int gup_flags); +ssize_t iov_iter_get_pages_alloc_flags(struct iov_iter *i, + struct page ***pages, size_t maxsize, size_t *start, + unsigned int gup_flags); +static inline ssize_t iov_iter_get_pages(struct iov_iter *i, + struct page **pages, size_t maxsize, unsigned maxpages, + size_t *start) +{ + return iov_iter_get_pages_flags(i, pages, maxsize, maxpages, start, 0); +} +static inline ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, + struct page ***pages, size_t maxsize, size_t *start) +{ + return iov_iter_get_pages_alloc_flags(i, pages, maxsize, start, 0); +} int iov_iter_npages(const struct iov_iter *i, int maxpages); const void *dup_iter(struct iov_iter *new, struct iov_iter *old, gfp_t flags); diff --git a/lib/iov_iter.c b/lib/iov_iter.c index f2d50d69a6c3..bbf0fb6736a9 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1468,9 +1468,9 @@ static struct page *first_bvec_segment(const struct iov_iter *i, return page; } -ssize_t iov_iter_get_pages(struct iov_iter *i, +ssize_t iov_iter_get_pages_flags(struct iov_iter *i, struct page **pages, size_t maxsize, unsigned maxpages, - size_t *start) + size_t *start, unsigned int gup_flags) { size_t len; int n, res; @@ -1485,9 +1485,11 @@ ssize_t iov_iter_get_pages(struct iov_iter *i, addr = first_iovec_segment(i, &len, start, maxsize, maxpages); n = DIV_ROUND_UP(len, PAGE_SIZE); - res = get_user_pages_fast(addr, n, - iov_iter_rw(i) != WRITE ? FOLL_WRITE : 0, - pages); + + if (iov_iter_rw(i) != WRITE) + gup_flags |= FOLL_WRITE; + + res = get_user_pages_fast(addr, n, gup_flags, pages); if (unlikely(res < 0)) return res; return (res == n ? len : res * PAGE_SIZE) - *start; @@ -1507,7 +1509,7 @@ ssize_t iov_iter_get_pages(struct iov_iter *i, return iter_xarray_get_pages(i, pages, maxsize, maxpages, start); return -EFAULT; } -EXPORT_SYMBOL(iov_iter_get_pages); +EXPORT_SYMBOL(iov_iter_get_pages_flags); static struct page **get_pages_array(size_t n) { @@ -1589,9 +1591,9 @@ static ssize_t iter_xarray_get_pages_alloc(struct iov_iter *i, return actual; } -ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, +ssize_t iov_iter_get_pages_alloc_flags(struct iov_iter *i, struct page ***pages, size_t maxsize, - size_t *start) + size_t *start, unsigned int gup_flags) { struct page **p; size_t len; @@ -1604,14 +1606,16 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, if (likely(iter_is_iovec(i))) { unsigned long addr; - addr = first_iovec_segment(i, &len, start, maxsize, ~0U); n = DIV_ROUND_UP(len, PAGE_SIZE); p = get_pages_array(n); if (!p) return -ENOMEM; - res = get_user_pages_fast(addr, n, - iov_iter_rw(i) != WRITE ? FOLL_WRITE : 0, p); + + if (iov_iter_rw(i) != WRITE) + gup_flags |= FOLL_WRITE; + + res = get_user_pages_fast(addr, n, gup_flags, p); if (unlikely(res < 0)) { kvfree(p); return res; @@ -1637,7 +1641,7 @@ ssize_t iov_iter_get_pages_alloc(struct iov_iter *i, return iter_xarray_get_pages_alloc(i, pages, maxsize, start); return -EFAULT; } -EXPORT_SYMBOL(iov_iter_get_pages_alloc); +EXPORT_SYMBOL(iov_iter_get_pages_alloc_flags); size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum, struct iov_iter *i) From patchwork Thu Sep 16 23:40:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500565 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,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 97DF2C4167B for ; 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Thu, 16 Sep 2021 17:41:11 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR106-000Vri-1x; Thu, 16 Sep 2021 17:41:06 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:56 -0600 Message-Id: <20210916234100.122368-17-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 16/20] block: set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() 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) Authentication-Results: imf18.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=iiwN1ZRE; spf=pass (imf18.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-Stat-Signature: a51w7ynkrpc6htctku5rt8dps5b45px1 X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: F00224002098 X-HE-Tag: 1631835672-374146 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: When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be passed from userspace and enables the O_DIRECT path in iomap based filesystems and direct to block devices. Signed-off-by: Logan Gunthorpe --- block/bio.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index 5df3dd282e40..2436e83fe3b4 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1088,6 +1088,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) struct bio_vec *bv = bio->bi_io_vec + bio->bi_vcnt; struct page **pages = (struct page **)bv; bool same_page = false; + unsigned int flags = 0; ssize_t size, left; unsigned len, i; size_t offset; @@ -1100,7 +1101,12 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2); pages += entries_left * (PAGE_PTRS_PER_BVEC - 1); - size = iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset); + if (bio->bi_bdev && bio->bi_bdev->bd_disk && + blk_queue_pci_p2pdma(bio->bi_bdev->bd_disk->queue)) + flags |= FOLL_PCI_P2PDMA; + + size = iov_iter_get_pages_flags(iter, pages, LONG_MAX, nr_pages, + &offset, flags); if (unlikely(size <= 0)) return size ? size : -EFAULT; From patchwork Thu Sep 16 23:40:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500595 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,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 E522AC433FE for ; Thu, 16 Sep 2021 23:41:49 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9819360F50 for ; Thu, 16 Sep 2021 23:41:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 9819360F50 Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=WZnD0MBg; spf=pass (imf19.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-HE-Tag: 1631835687-225813 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: When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be passed from userspace and enables the NVMe passthru requests to use P2PDMA pages. Signed-off-by: Logan Gunthorpe --- block/blk-map.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/blk-map.c b/block/blk-map.c index 4526adde0156..7508448e290c 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -234,6 +234,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, gfp_t gfp_mask) { unsigned int max_sectors = queue_max_hw_sectors(rq->q); + unsigned int flags = 0; struct bio *bio; int ret; int j; @@ -246,13 +247,17 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, return -ENOMEM; bio->bi_opf |= req_op(rq); + if (blk_queue_pci_p2pdma(rq->q)) + flags |= FOLL_PCI_P2PDMA; + while (iov_iter_count(iter)) { struct page **pages; ssize_t bytes; size_t offs, added = 0; int npages; - bytes = iov_iter_get_pages_alloc(iter, &pages, LONG_MAX, &offs); + bytes = iov_iter_get_pages_alloc_flags(iter, &pages, LONG_MAX, + &offs, flags); if (unlikely(bytes <= 0)) { ret = bytes ? bytes : -EFAULT; goto out_unmap; From patchwork Thu Sep 16 23:40:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500593 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,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 47DD4C433EF for ; Thu, 16 Sep 2021 23:41:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id F2DC560F6D for ; Thu, 16 Sep 2021 23:41:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org F2DC560F6D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=deltatee.com Authentication-Results: mail.kernel.org; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:MIME-Version:References:In-Reply-To: Message-Id:Date:Cc:To:From:content-disposition; bh=ldkK6FksW6AxBSIsN/n+YIWPajMSW0GYq8IzRYvtFoM=; b=OMj+IXhA0JlmDcMTNtuw+2naNo h+aSEBqNXGALEhnyVoJJQ02Zj7o7Zc9QOB+HlQGmZ1MdLz/kYLSgLKXn3vNz4ZouyEjt5er7gupt5 z33xIhm/pO6gFpEIcnqKlAvm9oUXO347Qddi9w6t//UZb/L7JZH7xFHh33H6AhrWylBygyn17hAvR /H1rKFjBtB7mFHaD4INKJGVdTq9Lo+eQ+MB6SpwSuitUO/WBujObJ655/GoumkDOgj9twvXY2vM0F 47f1/CRT1Dc+KenE0m9BVndGCJMkc2kcmbKYHLNSMJpiFZ895GlsBV2IabtQxZ81oTtdlhF9V5ps0 h1jpMxjA==; Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1mR10A-0008Hz-91; Thu, 16 Sep 2021 17:41:23 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR106-000Vrq-CV; Thu, 16 Sep 2021 17:41:06 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:40:58 -0600 Message-Id: <20210916234100.122368-19-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 18/20] mm: use custom page_free for P2PDMA pages 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-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 9BC0EF00008C X-Stat-Signature: 36jwya6ebxr7757zc4to4t7hcu455nrt Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b=OMj+IXhA; spf=pass (imf16.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-HE-Tag: 1631835686-396915 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: 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 DEV_PAGEMAP_OPS and the .page_free() operation. Change CONFIG_P2PDMA to select CONFIG_DEV_PAGEMAP_OPS and add MEMORY_DEVICE_PCI_P2PDMA to page_is_devmap_managed(), devmap_managed_enable_[put|get]() and free_devmap_managed_page(). Signed-off-by: Logan Gunthorpe --- drivers/pci/Kconfig | 1 + drivers/pci/p2pdma.c | 13 +++++++++++++ include/linux/mm.h | 1 + mm/memremap.c | 12 +++++++++--- 4 files changed, 24 insertions(+), 3 deletions(-) diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig index 90b4bddb3300..b31d35259d3a 100644 --- a/drivers/pci/Kconfig +++ b/drivers/pci/Kconfig @@ -165,6 +165,7 @@ config PCI_P2PDMA bool "PCI peer-to-peer transfer support" depends on ZONE_DEVICE && 64BIT select GENERIC_ALLOCATOR + select DEV_PAGEMAP_OPS help Enableѕ drivers to do PCI peer-to-peer transactions to and from BARs that are exposed in other devices that are the part of diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4478633346bd..2422af5a529c 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -100,6 +100,18 @@ static const struct attribute_group p2pmem_group = { .name = "p2pmem", }; +static void p2pdma_page_free(struct page *page) +{ + struct pci_p2pdma_pagemap *pgmap = to_p2p_pgmap(page->pgmap); + + gen_pool_free(pgmap->provider->p2pdma->pool, + (uintptr_t)page_to_virt(page), PAGE_SIZE); +} + +static const struct dev_pagemap_ops p2pdma_pgmap_ops = { + .page_free = p2pdma_page_free, +}; + static void pci_p2pdma_release(void *data) { struct pci_dev *pdev = data; @@ -197,6 +209,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, pgmap->range.end = pgmap->range.start + size - 1; pgmap->nr_range = 1; pgmap->type = MEMORY_DEVICE_PCI_P2PDMA; + pgmap->ops = &p2pdma_pgmap_ops; p2p_pgmap->provider = pdev; p2p_pgmap->bus_offset = pci_bus_address(pdev, bar) - diff --git a/include/linux/mm.h b/include/linux/mm.h index 6afdc09d0712..9a6ea00e5292 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1163,6 +1163,7 @@ static inline bool page_is_devmap_managed(struct page *page) switch (page->pgmap->type) { case MEMORY_DEVICE_PRIVATE: case MEMORY_DEVICE_FS_DAX: + case MEMORY_DEVICE_PCI_P2PDMA: return true; default: break; diff --git a/mm/memremap.c b/mm/memremap.c index ceebdb8a72bb..fbdc9991af0e 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -44,14 +44,16 @@ EXPORT_SYMBOL(devmap_managed_key); static void devmap_managed_enable_put(struct dev_pagemap *pgmap) { if (pgmap->type == MEMORY_DEVICE_PRIVATE || - pgmap->type == MEMORY_DEVICE_FS_DAX) + pgmap->type == MEMORY_DEVICE_FS_DAX || + pgmap->type == MEMORY_DEVICE_PCI_P2PDMA) static_branch_dec(&devmap_managed_key); } static void devmap_managed_enable_get(struct dev_pagemap *pgmap) { if (pgmap->type == MEMORY_DEVICE_PRIVATE || - pgmap->type == MEMORY_DEVICE_FS_DAX) + pgmap->type == MEMORY_DEVICE_FS_DAX || + pgmap->type == MEMORY_DEVICE_PCI_P2PDMA) static_branch_inc(&devmap_managed_key); } #else @@ -355,6 +357,10 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid) case MEMORY_DEVICE_GENERIC: break; case MEMORY_DEVICE_PCI_P2PDMA: + if (!pgmap->ops->page_free) { + WARN(1, "Missing page_free method\n"); + return ERR_PTR(-EINVAL); + } params.pgprot = pgprot_noncached(params.pgprot); break; default: @@ -504,7 +510,7 @@ EXPORT_SYMBOL_GPL(get_dev_pagemap); void free_devmap_managed_page(struct page *page) { /* notify page idle for dax */ - if (!is_device_private_page(page)) { + if (!is_device_private_page(page) && !is_pci_p2pdma_page(page)) { wake_up_var(&page->_refcount); return; } From patchwork Thu Sep 16 23:40:59 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500563 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,USER_AGENT_GIT autolearn=unavailable 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 726D6C4332F for ; Thu, 16 Sep 2021 23:41:20 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0C2326108F for ; Thu, 16 Sep 2021 23:41:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 0C2326108F Authentication-Results: mail.kernel.org; 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dkim=pass header.d=deltatee.com header.s=20200525 header.b=FvpT0F1T; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf08.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: DB61E3000243 X-HE-Tag: 1631835672-551131 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_mmap_p2pmem() which is a helper to allocate and mmap a hunk of p2pmem into userspace. Pages are allocated from the genalloc in bulk and their reference count incremented. They are returned to the genalloc when the page is put. The VMA does not take a reference to the pages when they are inserted with vmf_insert_mixed() (which is necessary for zone device pages) so the backing P2P memory is stored in a structures in vm_private_data. A pseudo mount is used to allocate an inode for each PCI device. The inode's address_space is used in the file doing the mmap so that all VMAs are collected and can be unmapped if the PCI device is unbound. After unmapping, the VMAs are iterated through and their pages are put so the device can continue to be unbound. An active flag is used to signal to VMAs not to allocate any further P2P memory once the removal process starts. The flag is synchronized with concurrent access with an RCU lock. The VMAs and inode will survive after the unbind of the device, but no pages will be present in the VMA and a subsequent access will result in a SIGBUS error. Signed-off-by: Logan Gunthorpe Acked-by: Bjorn Helgaas --- drivers/pci/p2pdma.c | 263 ++++++++++++++++++++++++++++++++++++- include/linux/pci-p2pdma.h | 11 ++ include/uapi/linux/magic.h | 1 + 3 files changed, 273 insertions(+), 2 deletions(-) diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 2422af5a529c..a5adf57af53a 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -16,14 +16,19 @@ #include #include #include +#include +#include #include #include #include +#include struct pci_p2pdma { struct gen_pool *pool; bool p2pmem_published; struct xarray map_types; + struct inode *inode; + bool active; }; struct pci_p2pdma_pagemap { @@ -32,6 +37,14 @@ struct pci_p2pdma_pagemap { u64 bus_offset; }; +struct pci_p2pdma_map { + struct kref ref; + struct pci_dev *pdev; + struct inode *inode; + void *kaddr; + size_t len; +}; + static struct pci_p2pdma_pagemap *to_p2p_pgmap(struct dev_pagemap *pgmap) { return container_of(pgmap, struct pci_p2pdma_pagemap, pgmap); @@ -100,6 +113,26 @@ static const struct attribute_group p2pmem_group = { .name = "p2pmem", }; +/* + * P2PDMA internal mount + * Fake an internal VFS mount-point in order to allocate struct address_space + * mappings to remove VMAs on unbind events. + */ +static int pci_p2pdma_fs_cnt; +static struct vfsmount *pci_p2pdma_fs_mnt; + +static int pci_p2pdma_fs_init_fs_context(struct fs_context *fc) +{ + return init_pseudo(fc, P2PDMA_MAGIC) ? 0 : -ENOMEM; +} + +static struct file_system_type pci_p2pdma_fs_type = { + .name = "p2dma", + .owner = THIS_MODULE, + .init_fs_context = pci_p2pdma_fs_init_fs_context, + .kill_sb = kill_anon_super, +}; + static void p2pdma_page_free(struct page *page) { struct pci_p2pdma_pagemap *pgmap = to_p2p_pgmap(page->pgmap); @@ -128,6 +161,9 @@ static void pci_p2pdma_release(void *data) gen_pool_destroy(p2pdma->pool); sysfs_remove_group(&pdev->dev.kobj, &p2pmem_group); xa_destroy(&p2pdma->map_types); + + iput(p2pdma->inode); + simple_release_fs(&pci_p2pdma_fs_mnt, &pci_p2pdma_fs_cnt); } static int pci_p2pdma_setup(struct pci_dev *pdev) @@ -145,17 +181,32 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) if (!p2p->pool) goto out; - error = devm_add_action_or_reset(&pdev->dev, pci_p2pdma_release, pdev); + error = simple_pin_fs(&pci_p2pdma_fs_type, &pci_p2pdma_fs_mnt, + &pci_p2pdma_fs_cnt); if (error) goto out_pool_destroy; + p2p->inode = alloc_anon_inode(pci_p2pdma_fs_mnt->mnt_sb); + if (IS_ERR(p2p->inode)) { + error = -ENOMEM; + goto out_unpin_fs; + } + + error = devm_add_action_or_reset(&pdev->dev, pci_p2pdma_release, pdev); + if (error) + goto out_put_inode; + error = sysfs_create_group(&pdev->dev.kobj, &p2pmem_group); if (error) - goto out_pool_destroy; + goto out_put_inode; rcu_assign_pointer(pdev->p2pdma, p2p); return 0; +out_put_inode: + iput(p2p->inode); +out_unpin_fs: + simple_release_fs(&pci_p2pdma_fs_mnt, &pci_p2pdma_fs_cnt); out_pool_destroy: gen_pool_destroy(p2p->pool); out: @@ -163,6 +214,45 @@ static int pci_p2pdma_setup(struct pci_dev *pdev) return error; } +static void pci_p2pdma_map_free_pages(struct pci_p2pdma_map *pmap) +{ + int i; + + if (!pmap->kaddr) + return; + + for (i = 0; i < pmap->len; i += PAGE_SIZE) + put_page(virt_to_page(pmap->kaddr + i)); + + pmap->kaddr = NULL; +} + +static void pci_p2pdma_free_mappings(struct address_space *mapping) +{ + struct vm_area_struct *vma; + + i_mmap_lock_write(mapping); + if (RB_EMPTY_ROOT(&mapping->i_mmap.rb_root)) + goto out; + + vma_interval_tree_foreach(vma, &mapping->i_mmap, 0, -1) + pci_p2pdma_map_free_pages(vma->vm_private_data); + +out: + i_mmap_unlock_write(mapping); +} + +static void pci_p2pdma_unmap_mappings(void *data) +{ + struct pci_dev *pdev = data; + struct pci_p2pdma *p2pdma = rcu_dereference_protected(pdev->p2pdma, 1); + + p2pdma->active = false; + synchronize_rcu(); + unmap_mapping_range(p2pdma->inode->i_mapping, 0, 0, 1); + pci_p2pdma_free_mappings(p2pdma->inode->i_mapping); +} + /** * pci_p2pdma_add_resource - add memory for use as p2p memory * @pdev: the device to add the memory to @@ -221,6 +311,11 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, goto pgmap_free; } + error = devm_add_action_or_reset(&pdev->dev, pci_p2pdma_unmap_mappings, + pdev); + if (error) + goto pages_free; + p2pdma = rcu_dereference_protected(pdev->p2pdma, 1); error = gen_pool_add_owner(p2pdma->pool, (unsigned long)addr, pci_bus_address(pdev, bar) + offset, @@ -229,6 +324,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, if (error) goto pages_free; + p2pdma->active = true; pci_info(pdev, "added peer-to-peer DMA memory %#llx-%#llx\n", pgmap->range.start, pgmap->range.end); @@ -1029,3 +1125,166 @@ ssize_t pci_p2pdma_enable_show(char *page, struct pci_dev *p2p_dev, return sprintf(page, "%s\n", pci_name(p2p_dev)); } EXPORT_SYMBOL_GPL(pci_p2pdma_enable_show); + +static struct pci_p2pdma_map *pci_p2pdma_map_alloc(struct pci_dev *pdev, + size_t len) +{ + struct pci_p2pdma_map *pmap; + + pmap = kzalloc(sizeof(*pmap), GFP_KERNEL); + if (!pmap) + return NULL; + + kref_init(&pmap->ref); + pmap->pdev = pci_dev_get(pdev); + pmap->len = len; + + return pmap; +} + +static void pci_p2pdma_map_free(struct kref *ref) +{ + struct pci_p2pdma_map *pmap = + container_of(ref, struct pci_p2pdma_map, ref); + + pci_p2pdma_map_free_pages(pmap); + pci_dev_put(pmap->pdev); + iput(pmap->inode); + simple_release_fs(&pci_p2pdma_fs_mnt, &pci_p2pdma_fs_cnt); + kfree(pmap); +} + +static void pci_p2pdma_vma_open(struct vm_area_struct *vma) +{ + struct pci_p2pdma_map *pmap = vma->vm_private_data; + + kref_get(&pmap->ref); +} + +static void pci_p2pdma_vma_close(struct vm_area_struct *vma) +{ + struct pci_p2pdma_map *pmap = vma->vm_private_data; + + kref_put(&pmap->ref, pci_p2pdma_map_free); +} + +static vm_fault_t pci_p2pdma_vma_fault(struct vm_fault *vmf) +{ + struct pci_p2pdma_map *pmap = vmf->vma->vm_private_data; + struct pci_p2pdma *p2pdma; + void *vaddr; + pfn_t pfn; + int i; + + if (!pmap->kaddr) { + rcu_read_lock(); + p2pdma = rcu_dereference(pmap->pdev->p2pdma); + if (!p2pdma) + goto err_out; + + if (!p2pdma->active) + goto err_out; + + pmap->kaddr = (void *)gen_pool_alloc(p2pdma->pool, pmap->len); + if (!pmap->kaddr) + goto err_out; + + for (i = 0; i < pmap->len; i += PAGE_SIZE) + get_page(virt_to_page(pmap->kaddr + i)); + + rcu_read_unlock(); + } + + vaddr = pmap->kaddr + (vmf->pgoff << PAGE_SHIFT); + pfn = phys_to_pfn_t(virt_to_phys(vaddr), PFN_DEV | PFN_MAP); + + return vmf_insert_mixed(vmf->vma, vmf->address, pfn); + +err_out: + rcu_read_unlock(); + return VM_FAULT_SIGBUS; +} +static const struct vm_operations_struct pci_p2pdma_vmops = { + .open = pci_p2pdma_vma_open, + .close = pci_p2pdma_vma_close, + .fault = pci_p2pdma_vma_fault, +}; + +/** + * pci_p2pdma_mmap_file_open - setup file mapping to store P2PMEM VMAs + * @pdev: the device to allocate memory from + * @vma: the userspace vma to map the memory to + * + * Set f_mapping of the file to the p2pdma inode so that mappings + * are can be torn down on device unbind. + * + * Returns 0 on success, or a negative error code on failure + */ +void pci_p2pdma_mmap_file_open(struct pci_dev *pdev, struct file *file) +{ + struct pci_p2pdma *p2pdma; + + rcu_read_lock(); + p2pdma = rcu_dereference(pdev->p2pdma); + if (p2pdma) + file->f_mapping = p2pdma->inode->i_mapping; + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(pci_p2pdma_mmap_file_open); + +/** + * pci_mmap_p2pmem - setup an mmap region to be backed with P2PDMA memory + * that was registered with pci_p2pdma_add_resource() + * @pdev: the device to allocate memory from + * @vma: the userspace vma to map the memory to + * + * The file must call pci_p2pdma_mmap_file_open() in its open() operation. + * + * Returns 0 on success, or a negative error code on failure + */ +int pci_mmap_p2pmem(struct pci_dev *pdev, struct vm_area_struct *vma) +{ + struct pci_p2pdma_map *pmap; + struct pci_p2pdma *p2pdma; + int ret; + + /* prevent private mappings from being established */ + if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) { + pci_info_ratelimited(pdev, + "%s: fail, attempted private mapping\n", + current->comm); + return -EINVAL; + } + + pmap = pci_p2pdma_map_alloc(pdev, vma->vm_end - vma->vm_start); + if (!pmap) + return -ENOMEM; + + rcu_read_lock(); + p2pdma = rcu_dereference(pdev->p2pdma); + if (!p2pdma) { + ret = -ENODEV; + goto out; + } + + ret = simple_pin_fs(&pci_p2pdma_fs_type, &pci_p2pdma_fs_mnt, + &pci_p2pdma_fs_cnt); + if (ret) + goto out; + + ihold(p2pdma->inode); + pmap->inode = p2pdma->inode; + rcu_read_unlock(); + + vma->vm_flags |= VM_MIXEDMAP; + vma->vm_private_data = pmap; + vma->vm_ops = &pci_p2pdma_vmops; + + return 0; + +out: + rcu_read_unlock(); + kfree(pmap); + return ret; +} +EXPORT_SYMBOL_GPL(pci_mmap_p2pmem); diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 0c33a40a86e7..f9f19f3db676 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -81,6 +81,8 @@ 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, bool use_p2pdma); +void pci_p2pdma_mmap_file_open(struct pci_dev *pdev, struct file *file); +int pci_mmap_p2pmem(struct pci_dev *pdev, struct vm_area_struct *vma); #else /* CONFIG_PCI_P2PDMA */ static inline int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size, u64 offset) @@ -152,6 +154,15 @@ static inline ssize_t pci_p2pdma_enable_show(char *page, { return sprintf(page, "none\n"); } +static inline void pci_p2pdma_mmap_file_open(struct pci_dev *pdev, + struct file *file) +{ +} +static inline int pci_mmap_p2pmem(struct pci_dev *pdev, + struct vm_area_struct *vma) +{ + return -EOPNOTSUPP; +} #endif /* CONFIG_PCI_P2PDMA */ diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h index 35687dcb1a42..af737842c56f 100644 --- a/include/uapi/linux/magic.h +++ b/include/uapi/linux/magic.h @@ -88,6 +88,7 @@ #define BPF_FS_MAGIC 0xcafe4a11 #define AAFS_MAGIC 0x5a3c69f0 #define ZONEFS_MAGIC 0x5a4f4653 +#define P2PDMA_MAGIC 0x70327064 /* Since UDF 2.01 is ISO 13346 based... */ #define UDF_SUPER_MAGIC 0x15013346 From patchwork Thu Sep 16 23:41:00 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 12500597 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,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 90263C4321E for ; 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Thu, 16 Sep 2021 17:41:23 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.94.2) (envelope-from ) id 1mR106-000Vry-PT; Thu, 16 Sep 2021 17:41:06 -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_K=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 , Martin Oliveira , Chaitanya Kulkarni , Logan Gunthorpe Date: Thu, 16 Sep 2021 17:41:00 -0600 Message-Id: <20210916234100.122368-21-logang@deltatee.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210916234100.122368-1-logang@deltatee.com> References: <20210916234100.122368-1-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, martin.oliveira@eideticom.com, ckulkarnilinux@gmail.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v3 20/20] nvme-pci: allow mmaping the CMB in userspace 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-Stat-Signature: 6xcxx9jubxbauawm91p7aorakhhrpnsq Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=deltatee.com header.s=20200525 header.b="hN6uw/Ed"; dmarc=pass (policy=none) header.from=deltatee.com; spf=pass (imf28.hostedemail.com: domain of gunthorp@deltatee.com designates 204.191.154.188 as permitted sender) smtp.mailfrom=gunthorp@deltatee.com X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 726A590000BC X-HE-Tag: 1631835687-662298 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: Allow userspace to obtain CMB memory by mmaping the controller's char device. The mmap call allocates and returns a hunk of CMB memory, (the offset is ignored) so userspace does not have control over the address within the CMB. A VMA allocated in this way will only be usable by drivers that set FOLL_PCI_P2PDMA when calling GUP. And inter-device support will be checked the first time the pages are mapped for DMA. Currently this is only supported by O_DIRECT to an PCI NVMe device or through the NVMe passthrough IOCTL. Signed-off-by: Logan Gunthorpe --- drivers/nvme/host/core.c | 15 +++++++++++++++ drivers/nvme/host/nvme.h | 2 ++ drivers/nvme/host/pci.c | 18 ++++++++++++++++++ 3 files changed, 35 insertions(+) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 916750a54f60..dfc18f0bdeee 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3075,6 +3075,10 @@ static int nvme_dev_open(struct inode *inode, struct file *file) } file->private_data = ctrl; + + if (ctrl->ops->mmap_file_open) + ctrl->ops->mmap_file_open(ctrl, file); + return 0; } @@ -3088,12 +3092,23 @@ static int nvme_dev_release(struct inode *inode, struct file *file) return 0; } +static int nvme_dev_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct nvme_ctrl *ctrl = file->private_data; + + if (!ctrl->ops->mmap_cmb) + return -ENODEV; + + return ctrl->ops->mmap_cmb(ctrl, vma); +} + static const struct file_operations nvme_dev_fops = { .owner = THIS_MODULE, .open = nvme_dev_open, .release = nvme_dev_release, .unlocked_ioctl = nvme_dev_ioctl, .compat_ioctl = compat_ptr_ioctl, + .mmap = nvme_dev_mmap, }; static ssize_t nvme_sysfs_reset(struct device *dev, diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index fb9bfc52a6d7..1cc721290d4c 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -485,6 +485,8 @@ struct nvme_ctrl_ops { void (*delete_ctrl)(struct nvme_ctrl *ctrl); int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); bool (*supports_pci_p2pdma)(struct nvme_ctrl *ctrl); + void (*mmap_file_open)(struct nvme_ctrl *ctrl, struct file *file); + int (*mmap_cmb)(struct nvme_ctrl *ctrl, struct vm_area_struct *vma); }; /* diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index e2cd73129a88..9d69e4a3d62e 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2870,6 +2870,22 @@ static bool nvme_pci_supports_pci_p2pdma(struct nvme_ctrl *ctrl) return dma_pci_p2pdma_supported(dev->dev); } +static void nvme_pci_mmap_file_open(struct nvme_ctrl *ctrl, + struct file *file) +{ + struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev); + + pci_p2pdma_mmap_file_open(pdev, file); +} + +static int nvme_pci_mmap_cmb(struct nvme_ctrl *ctrl, + struct vm_area_struct *vma) +{ + struct pci_dev *pdev = to_pci_dev(to_nvme_dev(ctrl)->dev); + + return pci_mmap_p2pmem(pdev, vma); +} + static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { .name = "pcie", .module = THIS_MODULE, @@ -2881,6 +2897,8 @@ static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { .submit_async_event = nvme_pci_submit_async_event, .get_address = nvme_pci_get_address, .supports_pci_p2pdma = nvme_pci_supports_pci_p2pdma, + .mmap_file_open = nvme_pci_mmap_file_open, + .mmap_cmb = nvme_pci_mmap_cmb, }; static int nvme_dev_map(struct nvme_dev *dev)