From patchwork Thu Sep 12 11:15:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13802005 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 BDAC11A4E8F; Thu, 12 Sep 2024 11:16:29 +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=1726139789; cv=none; b=Dxh1wt+UmeFWqiN8+Uh/n90DPlzlek6ecZi0ZZGqjGCjX2r1BuynUajDW22tZQNJXAFmg3dLXYThFYead4lg17ifv06GpoHoM69tLMMqxTd3c11P4CYdH6G46rP50IE1GPdFfcYwI1A9S9wGyAWrfwtgKM0hM/5OSICKGV4Z8zs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139789; c=relaxed/simple; bh=YbYR1B9oX34Xv+Cehx9/tYc07da7ONVOmPeGXmHRn1c=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qta8zsy87l0hJ7KQq/SyFQDFKU8kXDUExesB78iCQ0LbDZ5JfezBGIOtSEZLV1iHDNUzeRGvgdaVcaDc/L0daHyjzrpEWDJGQRM+/e4hOwLn4P2/tTb3udxBURn5AyboEV2i10bReEahc63toADl0QsIvbkHeXPT5Rr5FuI2mbs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fMCA+j/u; 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="fMCA+j/u" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 89AE0C4CECC; Thu, 12 Sep 2024 11:16:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726139789; bh=YbYR1B9oX34Xv+Cehx9/tYc07da7ONVOmPeGXmHRn1c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fMCA+j/uOJoozgNYTkAQZ9i5owgnrutNMDDvBGalOj/zk/VYWCdYuZ4BwEUgbo+Ee 8IK3/oKPT7MWMTtxPtDL2tX4K+v6ORqHmqpoXabXDx37Z0XKm5aVZRF6/WCoJ9ITzO y2gg2RxijzVwlXxmRZdMVaHnbiANFg06GCTCeNRhNlUjPZ4StdmFz7Mfcxa8G1XV1K slWv9Nbw6MJs1cRNGwbW5Pi2YtCX+5q7wtccX+oU6he+cAY4vrHTPY4NBWkdGZdWz5 rmSAiwxnbgN6fVd3O1RZFGWZ5pQ/Skqfv2XfNFsGj0rdVOoX/QhfA/JxO+QYtRiKMd e8hcOh4m/hvyg== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Leon Romanovsky , Sagi Grimberg , Bjorn Helgaas , Logan Gunthorpe , Yishai Hadas , Shameer Kolothum , Kevin Tian , Alex Williamson , Marek Szyprowski , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Andrew Morton , linux-block@vger.kernel.org, linux-kernel@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: [RFC v2 07/21] dma-mapping: implement link range API Date: Thu, 12 Sep 2024 14:15:42 +0300 Message-ID: X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Leon Romanovsky Introduce new DMA APIs to perform DMA linkage of buffers in layers higher than DMA. In proposed API, the callers will perform the following steps: dma_alloc_iova() if (dma_can_use_iova(...)) dma_start_range(...) for (page in range) dma_link_range(...) dma_end_range(...) else /* Fallback to legacy map pages */ dma_map_page(...) Signed-off-by: Leon Romanovsky --- include/linux/dma-mapping.h | 26 ++++++++++++++++ kernel/dma/mapping.c | 60 +++++++++++++++++++++++++++++++++++++ 2 files changed, 86 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 2c74e68b0567..bb541f8944e5 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -11,6 +11,7 @@ #include #include #include +#include /** * List of possible attributes associated with a DMA mapping. The semantics @@ -82,6 +83,7 @@ struct dma_iova_state { size_t size; enum dma_data_direction dir; u8 use_iova : 1; + size_t range_size; }; static inline void dma_init_iova_state(struct dma_iova_state *state, @@ -173,6 +175,11 @@ int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, void dma_set_iova_state(struct dma_iova_state *state, struct page *page, size_t size); bool dma_can_use_iova(struct dma_iova_state *state); +int dma_start_range(struct dma_iova_state *state); +void dma_end_range(struct dma_iova_state *state); +dma_addr_t dma_link_range_attrs(struct dma_iova_state *state, phys_addr_t phys, + size_t size, unsigned long attrs); +void dma_unlink_range_attrs(struct dma_iova_state *state, unsigned long attrs); #else /* CONFIG_HAS_DMA */ static inline int dma_alloc_iova_unaligned(struct dma_iova_state *state, phys_addr_t phys, size_t size) @@ -319,6 +326,23 @@ static inline bool dma_can_use_iova(struct dma_iova_state *state) { return false; } +static inline int dma_start_range(struct dma_iova_state *state) +{ + return -EOPNOTSUPP; +} +static inline void dma_end_range(struct dma_iova_state *state) +{ +} +static inline dma_addr_t dma_link_range_attrs(struct dma_iova_state *state, + phys_addr_t phys, size_t size, + unsigned long attrs) +{ + return DMA_MAPPING_ERROR; +} +static inline void dma_unlink_range_attrs(struct dma_iova_state *state, + unsigned long attrs) +{ +} #endif /* CONFIG_HAS_DMA */ #if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) @@ -513,6 +537,8 @@ static inline void dma_sync_sgtable_for_device(struct device *dev, #define dma_unmap_page(d, a, s, r) dma_unmap_page_attrs(d, a, s, r, 0) #define dma_get_sgtable(d, t, v, h, s) dma_get_sgtable_attrs(d, t, v, h, s, 0) #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, 0) +#define dma_link_range(d, p, o) dma_link_range_attrs(d, p, o, 0) +#define dma_unlink_range(d) dma_unlink_range_attrs(d, 0) bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size); diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 16cb03d5d87d..39fac8c21643 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -1024,3 +1024,63 @@ bool dma_can_use_iova(struct dma_iova_state *state) return state->use_iova; } EXPORT_SYMBOL_GPL(dma_can_use_iova); + +/** + * dma_start_range - Start a range of IOVA space + * @state: IOVA state + * + * Start a range of IOVA space for the given IOVA state. + */ +int dma_start_range(struct dma_iova_state *state) +{ + if (!state->use_iova) + return 0; + + return iommu_dma_start_range(state->dev); +} +EXPORT_SYMBOL_GPL(dma_start_range); + +/** + * dma_end_range - End a range of IOVA space + * @state: IOVA state + * + * End a range of IOVA space for the given IOVA state. + */ +void dma_end_range(struct dma_iova_state *state) +{ + if (!state->use_iova) + return; + + iommu_dma_end_range(state->dev); +} +EXPORT_SYMBOL_GPL(dma_end_range); + +/** + * dma_link_range_attrs - Link a range of IOVA space + * @state: IOVA state + * @phys: physical address to link + * @size: size of the buffer + * @attrs: attributes of mapping properties + * + * Link a range of IOVA space for the given IOVA state. + */ +dma_addr_t dma_link_range_attrs(struct dma_iova_state *state, phys_addr_t phys, + size_t size, unsigned long attrs) +{ + return iommu_dma_link_range(state, phys, size, attrs); +} +EXPORT_SYMBOL_GPL(dma_link_range_attrs); + +/** + * dma_unlink_range_attrs - Unlink a range of IOVA space + * @state: IOVA state + * @attrs: attributes of mapping properties + * + * Unlink a range of IOVA space for the given IOVA state. + */ +void dma_unlink_range_attrs(struct dma_iova_state *state, unsigned long attrs) +{ + iommu_dma_unlink_range(state->dev, state->addr, state->range_size, + state->dir, attrs); +} +EXPORT_SYMBOL_GPL(dma_unlink_range_attrs);