From patchwork Sun Oct 27 14:21:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13852571 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE41117B439; Sun, 27 Oct 2024 14:21:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730038900; cv=none; b=iEvx9L2C9qIsDbDJA00blEJgE8JBfFdCA6+eptT83V3LKQreQhzJV+oVP6sioGzUU8yn/Q/H2hoA1QCAApF9EfnYU6+79s/kKNT1NizK/MOZSxHFqQL7+bAIjXX3BZmYzaTIKBNU6mkiIZekWV30r8MVPMrgwcUtg76dPDWQfNY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730038900; c=relaxed/simple; bh=mMv5ivKZnrq5wTJK9xe2uOLrB81TyleydzmptqBr1cY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CvjrjzEyB/KKF50jC4cv2mkmpPBU7TcD+zCywkZ2JTUQPoai5aP8YAmYKpWmq4ebB/yCnZqnIWybw7x5RGectjdIzbzd/3UZX7LuFekFIPR73w+3W2fcidEfxKT2rOw3V3/+QyuOjJfSdbQl/UlnurkfhPxrWmTBXBu2wFjqlX4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=u+QtyyGx; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="u+QtyyGx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A14C5C4CEC3; Sun, 27 Oct 2024 14:21:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730038899; bh=mMv5ivKZnrq5wTJK9xe2uOLrB81TyleydzmptqBr1cY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=u+QtyyGxO6sV+DJmwPh4Su2TK5gj3Qp3052pUqEJR+prtFmaQ5jikzOd8XKV4OSpo Sv9Spv6vybok40YNPsJx3S/gprWP8Am34W10etZFMd1Je+qOCAeQGzLhZkXMC1U3Dd KtEo/foOKkoBmUt2qAv1JWeLUvtFQVw6msSr8vlqfy0EgP09h/TP+sTWkKNqjkNCQx heheTH7qDUq9IB5345/0YxdhbsjOWWNTeL6jSxU1g5v8NPHvUsdsge3j9Bs28GpdFg eWxFH7HDRMKAeEhLnr3e+tDplEjUb/RZH7cdmMrM3sK3T6H2agOZ8Kkxhe1OBg3rH/ ewX1Fqmev9HcQ== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Christoph Hellwig , Sagi Grimberg Cc: Keith Busch , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , Jonathan Corbet , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-rdma@vger.kernel.org, iommu@lists.linux.dev, linux-nvme@lists.infradead.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 02/18] dma-mapping: move the PCI P2PDMA mapping helpers to pci-p2pdma.h Date: Sun, 27 Oct 2024 16:21:02 +0200 Message-ID: <27698e7cc55f6ca5371c3d86c50fd3afce9afddd.1730037276.git.leon@kernel.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Christoph Hellwig To support the upcoming non-scatterlist mapping helpers, we need to go back to have them called outside of the DMA API. Thus move them out of dma-map-ops.h, which is only for DMA API implementations to pci-p2pdma.h, which is for driver use. Note that the core helper is still not exported as the mapping is expected to be done only by very highlevel subsystem code at least for now. Signed-off-by: Christoph Hellwig Signed-off-by: Leon Romanovsky Reviewed-by: Logan Gunthorpe Acked-by: Bjorn Helgaas --- drivers/iommu/dma-iommu.c | 1 + include/linux/dma-map-ops.h | 84 ------------------------------------- include/linux/pci-p2pdma.h | 84 +++++++++++++++++++++++++++++++++++++ kernel/dma/direct.c | 1 + 4 files changed, 86 insertions(+), 84 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 6e50023c8112..c422e36c0d66 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 49edcbda19d1..6ee626e50708 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -435,88 +435,4 @@ static inline void debug_dma_dump_mappings(struct device *dev) extern const struct dma_map_ops dma_dummy_ops; -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, - - /* - * Not a PCI P2PDMA transfer. - */ - PCI_P2PDMA_MAP_NONE, - - /* - * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will - * traverse the host bridge and the host bridge is not in the - * allowlist. 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 - * each other 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 each other, but the transaction traverses a host bridge on the - * allowlist. 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, -}; - -struct pci_p2pdma_map_state { - struct dev_pagemap *pgmap; - enum pci_p2pdma_map_type map; - u64 bus_off; -}; - -/* helper for pci_p2pdma_state(), do not use directly */ -void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, - struct device *dev, struct page *page); - -/** - * pci_p2pdma_state - check the P2P transfer state of a page - * @state: P2P state structure - * @dev: device to transfer to/from - * @page: page to map - * - * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the - * map type, and updates @state with all information needed for a P2P transfer. - */ -static inline enum pci_p2pdma_map_type -pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, - struct page *page) -{ - if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { - if (state->pgmap != page->pgmap) - __pci_p2pdma_update_state(state, dev, page); - return state->map; - } - return PCI_P2PDMA_MAP_NONE; -} - -/** - * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer - * @state: P2P state structure - * @paddr: physical address to map - * - * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. - */ -static inline dma_addr_t -pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) -{ - WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); - return paddr + state->bus_off; -} - #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/include/linux/pci-p2pdma.h b/include/linux/pci-p2pdma.h index 2c07aa6b7665..66b71f60a811 100644 --- a/include/linux/pci-p2pdma.h +++ b/include/linux/pci-p2pdma.h @@ -104,4 +104,88 @@ static inline struct pci_dev *pci_p2pmem_find(struct device *client) return pci_p2pmem_find_many(&client, 1); } +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, + + /* + * Not a PCI P2PDMA transfer. + */ + PCI_P2PDMA_MAP_NONE, + + /* + * PCI_P2PDMA_MAP_NOT_SUPPORTED: Indicates the transaction will + * traverse the host bridge and the host bridge is not in the + * allowlist. 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 + * each other 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 each other, but the transaction traverses a host bridge on the + * allowlist. 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, +}; + +struct pci_p2pdma_map_state { + struct dev_pagemap *pgmap; + enum pci_p2pdma_map_type map; + u64 bus_off; +}; + +/* helper for pci_p2pdma_state(), do not use directly */ +void __pci_p2pdma_update_state(struct pci_p2pdma_map_state *state, + struct device *dev, struct page *page); + +/** + * pci_p2pdma_state - check the P2P transfer state of a page + * @state: P2P state structure + * @dev: device to transfer to/from + * @page: page to map + * + * Check if @page is a PCI P2PDMA page, and if yes of what kind. Returns the + * map type, and updates @state with all information needed for a P2P transfer. + */ +static inline enum pci_p2pdma_map_type +pci_p2pdma_state(struct pci_p2pdma_map_state *state, struct device *dev, + struct page *page) +{ + if (IS_ENABLED(CONFIG_PCI_P2PDMA) && is_pci_p2pdma_page(page)) { + if (state->pgmap != page->pgmap) + __pci_p2pdma_update_state(state, dev, page); + return state->map; + } + return PCI_P2PDMA_MAP_NONE; +} + +/** + * pci_p2pdma_bus_addr_map - map a PCI_P2PDMA_MAP_BUS_ADDR P2P transfer + * @state: P2P state structure + * @paddr: physical address to map + * + * Map a physically contigous PCI_P2PDMA_MAP_BUS_ADDR transfer. + */ +static inline dma_addr_t +pci_p2pdma_bus_addr_map(struct pci_p2pdma_map_state *state, phys_addr_t paddr) +{ + WARN_ON_ONCE(state->map != PCI_P2PDMA_MAP_BUS_ADDR); + return paddr + state->bus_off; +} + #endif /* _LINUX_PCI_P2P_H */ diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index a793400161c2..47e124561fff 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -13,6 +13,7 @@ #include #include #include +#include #include "direct.h" /*