From nobody Sat Nov 30 03:28:55 2024 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 2960B1BDAAF; Thu, 12 Sep 2024 11:17:17 +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=1726139838; cv=none; b=iRSQSxAe8pit+GvsSlL/wdaKsI91BUIJl4uO3SR4smYqvJxemPADJN1/2K6kekhuEOXfyoKhyRCgeTq3M42LjKOadurzWJ2iCuQRV3ffcRTm/7lKiqY/qiuLAprJqrd0HgkzdcMMjujU+aQdDpM8/QMJpAHJYpRfxbW38bdju28= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726139838; c=relaxed/simple; bh=wkFj1cXNmX5ZlhYlYscU+J0rWGL2pg30iH0xC9v8VVY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UPOwg7vM41VyNKl4GGMMrrvp/vu6He2klpQOfgk2QyzBq1gDljFaY+1Ne5xgFK0C2yoCsVP5/d4iTWBvr7XeOKc0AYUuWLiELvzQfEIeDbenlu27QQIz7TegK2FkE7gzyBgiZzS9tllJOOimfgMQZNlDJqwUxETSfB2SZU/TlxI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=QFWaxyYp; 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="QFWaxyYp" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F0BF2C4CEC3; Thu, 12 Sep 2024 11:17:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1726139837; bh=wkFj1cXNmX5ZlhYlYscU+J0rWGL2pg30iH0xC9v8VVY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QFWaxyYpYfe2FFX+K0p+Goy6dyaOFgOpyojuT6rJgqucu1wtXJ7Ko6B4Z9/VXe95S 2I3S4vrw+Ff5zb5nynL5Vh4Yw/g8+uv0ZNC87b03g7DhVrmV3YivYg7uBbwVNe/GZG +MBvLijRXvMiwL3ZM84io5kv0P8Wbcp45n4DIbM7CtyDWAAQlTWkB20jUCGxLF406f CPRu/FtyIHE0iWOhGGjqbS+ZeLgoViJvPDk3twLQyYGb5FUYjNquCd5o/JMVAX1ObX p/Oa3w5s2HlnKu34VY+AD80OkZOKYp43R+53dQV6GuLtLI/rUJqwRY2wXjSwusplbM Yvypy/0K4VPSA== 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?q?J=C3=A9r=C3=B4me=20Glisse?= , 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 13/21] RDMA/umem: Prevent UMEM ODP creation with SWIOTLB Date: Thu, 12 Sep 2024 14:15:48 +0300 Message-ID: X-Mailer: git-send-email 2.46.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Leon Romanovsky RDMA UMEM never supported DMA addresses returned from SWIOTLB, as these addresses should be programmed to the hardware which is not aware that it is bounce buffers and not real ones. Instead of silently leave broken system for the users who didn't know it, let's be explicit and return an error to them. Signed-off-by: Leon Romanovsky --- drivers/infiniband/core/umem_odp.c | 78 +++++++++++++++--------------- drivers/iommu/dma-iommu.c | 1 + 2 files changed, 40 insertions(+), 39 deletions(-) diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/u= mem_odp.c index 7bfa1e54454c..58fc3d4bfb73 100644 --- a/drivers/infiniband/core/umem_odp.c +++ b/drivers/infiniband/core/umem_odp.c @@ -42,7 +42,7 @@ #include #include #include - +#include #include =20 #include "uverbs.h" @@ -51,49 +51,49 @@ static inline int ib_init_umem_odp(struct ib_umem_odp *= umem_odp, const struct mmu_interval_notifier_ops *ops) { struct ib_device *dev =3D umem_odp->umem.ibdev; + size_t page_size =3D 1UL << umem_odp->page_shift; + unsigned long start, end; + size_t ndmas, npfns; int ret; =20 umem_odp->umem.is_odp =3D 1; mutex_init(&umem_odp->umem_mutex); + if (umem_odp->is_implicit_odp) + return 0; + + if (!iommu_can_use_iova(dev->dma_device, NULL, page_size, + DMA_BIDIRECTIONAL)) + return -EOPNOTSUPP; + + start =3D ALIGN_DOWN(umem_odp->umem.address, page_size); + if (check_add_overflow(umem_odp->umem.address, + (unsigned long)umem_odp->umem.length, &end)) + return -EOVERFLOW; + end =3D ALIGN(end, page_size); + if (unlikely(end < page_size)) + return -EOVERFLOW; + + ndmas =3D (end - start) >> umem_odp->page_shift; + if (!ndmas) + return -EINVAL; + + npfns =3D (end - start) >> PAGE_SHIFT; + umem_odp->pfn_list =3D + kvcalloc(npfns, sizeof(*umem_odp->pfn_list), GFP_KERNEL); + if (!umem_odp->pfn_list) + return -ENOMEM; + + dma_init_iova_state(&umem_odp->state, dev->dma_device, + DMA_BIDIRECTIONAL); + ret =3D dma_alloc_iova(&umem_odp->state, end - start); + if (ret) + goto out_pfn_list; =20 - if (!umem_odp->is_implicit_odp) { - size_t page_size =3D 1UL << umem_odp->page_shift; - unsigned long start; - unsigned long end; - size_t ndmas, npfns; - - start =3D ALIGN_DOWN(umem_odp->umem.address, page_size); - if (check_add_overflow(umem_odp->umem.address, - (unsigned long)umem_odp->umem.length, - &end)) - return -EOVERFLOW; - end =3D ALIGN(end, page_size); - if (unlikely(end < page_size)) - return -EOVERFLOW; - - ndmas =3D (end - start) >> umem_odp->page_shift; - if (!ndmas) - return -EINVAL; - - npfns =3D (end - start) >> PAGE_SHIFT; - umem_odp->pfn_list =3D kvcalloc( - npfns, sizeof(*umem_odp->pfn_list), GFP_KERNEL); - if (!umem_odp->pfn_list) - return -ENOMEM; - - - dma_init_iova_state(&umem_odp->state, dev->dma_device, - DMA_BIDIRECTIONAL); - ret =3D dma_alloc_iova(&umem_odp->state, end - start); - if (ret) - goto out_pfn_list; - - ret =3D mmu_interval_notifier_insert(&umem_odp->notifier, - umem_odp->umem.owning_mm, - start, end - start, ops); - if (ret) - goto out_free_iova; - } + ret =3D mmu_interval_notifier_insert(&umem_odp->notifier, + umem_odp->umem.owning_mm, start, + end - start, ops); + if (ret) + goto out_free_iova; =20 return 0; =20 diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 3e2e382bb502..af3428ae150d 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1849,6 +1849,7 @@ bool iommu_can_use_iova(struct device *dev, struct pa= ge *page, size_t size, =20 return true; } +EXPORT_SYMBOL_GPL(iommu_can_use_iova); =20 void iommu_setup_dma_ops(struct device *dev) { --=20 2.46.0