From patchwork Tue Jul 2 09:09:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13719153 X-Patchwork-Delegate: bhelgaas@google.com 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 7AEB315A86B; Tue, 2 Jul 2024 09:10:29 +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=1719911429; cv=none; b=i9Oh51P+SZfBEooka5H8I1Fli6tDplniRj8CGB4xY28INvHkvgNCNJwRUegmvu8XZIqhIwuF2/OeMKXlOosMdSTT2R1NhLWj6zHNovnhZjwFmRlCp1Tydh1VEGamtBWjE2uSRA9iTUukthcPI+o+oha5g1TUF+8kUUzaKMg0XxU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719911429; c=relaxed/simple; bh=suT8AWgnm6GBnp/JyhIgcl0q4xx7OPR0g7KMmtGZr9Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=goEs5ukKJpXkTMxJWI7p3Hl3iMGoMmm/XslY/IK4SMmkoZrBH882Nwt0UKcUtO5ebDUfU8sTjgUex07BlDGL8aWahlOf3/q5+RQuv48STM6RS7eEjVNrVPvWIYu7Cs8u2LRo7nqms5lzpx8TSGDoohere1XtDrALVXZGfEm7Ws4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rq4OARQm; 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="rq4OARQm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3ADDBC116B1; Tue, 2 Jul 2024 09:10:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719911429; bh=suT8AWgnm6GBnp/JyhIgcl0q4xx7OPR0g7KMmtGZr9Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rq4OARQmYhfiLIiz6G9wms51urucovfps8babGp4qOGPRB4+5JYgUHLAf6DLfrqPT hJXfo5keL4ouKe9Y4EGQdEL9StrtH1y0FoD0WIEG6+W6CO3MX++fPmfQii7hxJRJux fusUTN23YcTMGW6P7yhGGqD1y1aMsDmtGmRN8YuzUAp5T8XEoteErwwnKbH0sieTGn NDceqME/1xe7SEg4mP6v20tLeGjQsiNWxolnzJ+VOCoSlueXx8IZMPwdetZjLTcW8K X/5eBD/D3Zv08vRmpy+naCb5TKMeQuI9m5F7mEmHjHwRQltCAQDN/qS030U5hOEtlB dKCPiM7uI6ZuQ== 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 PATCH v1 08/18] iommu/dma: Implement link/unlink ranges callbacks Date: Tue, 2 Jul 2024 12:09:38 +0300 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Leon Romanovsky Add an implementation of link/unlink interface to perform in map/unmap pages in fast patch for pre-allocated IOVA. Signed-off-by: Leon Romanovsky --- drivers/iommu/dma-iommu.c | 79 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 0b5ca6961940..7425d155a14e 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1731,6 +1731,82 @@ static void iommu_dma_free_iova(struct device *dev, dma_addr_t iova, __iommu_dma_free_iova(cookie, iova, size, &iotlb_gather); } +static int iommu_dma_start_range(struct dma_iova_state *state) +{ + struct device *dev = state->iova->dev; + + state->domain = iommu_get_dma_domain(dev); + + if (static_branch_unlikely(&iommu_deferred_attach_enabled)) + return iommu_deferred_attach(dev, state->domain); + + return 0; +} + +static int iommu_dma_link_range(struct dma_iova_state *state, phys_addr_t phys, + dma_addr_t addr, size_t size) +{ + struct iommu_domain *domain = state->domain; + struct iommu_dma_cookie *cookie = domain->iova_cookie; + struct iova_domain *iovad = &cookie->iovad; + struct device *dev = state->iova->dev; + enum dma_data_direction dir = state->iova->dir; + bool coherent = dev_is_dma_coherent(dev); + unsigned long attrs = state->iova->attrs; + int prot = dma_info_to_prot(dir, coherent, attrs); + + if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + arch_sync_dma_for_device(phys, size, dir); + + size = iova_align(iovad, size); + return iommu_map(domain, addr, phys, size, prot, GFP_ATOMIC); +} + +static void iommu_sync_dma_for_cpu(struct iommu_domain *domain, + dma_addr_t start, size_t size, + enum dma_data_direction dir) +{ + size_t sync_size, unmapped = 0; + phys_addr_t phys; + + do { + phys = iommu_iova_to_phys(domain, start + unmapped); + if (WARN_ON(!phys)) + continue; + + sync_size = (unmapped + PAGE_SIZE > size) ? size % PAGE_SIZE : + PAGE_SIZE; + arch_sync_dma_for_cpu(phys, sync_size, dir); + unmapped += sync_size; + } while (unmapped < size); +} + +static void iommu_dma_unlink_range(struct dma_iova_state *state, + dma_addr_t start, size_t size) +{ + struct device *dev = state->iova->dev; + struct iommu_domain *domain = iommu_get_dma_domain(dev); + struct iommu_dma_cookie *cookie = domain->iova_cookie; + struct iova_domain *iovad = &cookie->iovad; + struct iommu_iotlb_gather iotlb_gather; + bool coherent = dev_is_dma_coherent(dev); + unsigned long attrs = state->iova->attrs; + size_t unmapped; + + iommu_iotlb_gather_init(&iotlb_gather); + iotlb_gather.queued = READ_ONCE(cookie->fq_domain); + + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) && !coherent) + iommu_sync_dma_for_cpu(domain, start, size, state->iova->dir); + + size = iova_align(iovad, size); + unmapped = iommu_unmap_fast(domain, start, size, &iotlb_gather); + WARN_ON(unmapped != size); + + if (!iotlb_gather.queued) + iommu_iotlb_sync(domain, &iotlb_gather); +} + static const struct dma_map_ops iommu_dma_ops = { .flags = DMA_F_PCI_P2PDMA_SUPPORTED | DMA_F_CAN_SKIP_SYNC, @@ -1757,6 +1833,9 @@ static const struct dma_map_ops iommu_dma_ops = { .max_mapping_size = iommu_dma_max_mapping_size, .alloc_iova = iommu_dma_alloc_iova, .free_iova = iommu_dma_free_iova, + .link_range = iommu_dma_link_range, + .unlink_range = iommu_dma_unlink_range, + .start_range = iommu_dma_start_range, }; void iommu_setup_dma_ops(struct device *dev)