From patchwork Tue Jul 2 09:09:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Leon Romanovsky X-Patchwork-Id: 13719186 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 EEB0115098E; Tue, 2 Jul 2024 09:10:08 +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=1719911409; cv=none; b=P5SnoL6WtKPb8VbRWd/5Evjo52Rh1+xvkOFiCcTz5hLpkLgEZwbLezkVr2CGHCOUBM+4E6B5wuu4CPViU6Am4+9z3IvKwV6SrZTXzyn6cTrbxCnGEHJ+a0di8k0g7x3BQFEscI0cFNE/I7goago/FEK4eglg5eU6H63ocGhR264= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719911409; c=relaxed/simple; bh=I7mD3dENF4HZBNBumoLyPjANfOtz0e/DAq7U9sRqLk0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F6HrbetSOL8cQw0MHFDrfLfzwtQj9Au19yHL3h/aDOL0fkTaOWVS7ckEjjUnmq0VIK0bMdz0rrGYjVawBx7+cG96agAHTTp3KILgVXy7iW8YSHQNC+NVgyxVoHO+eZibIMAjM0Anr9QM1jh5IPVZeeN8tu0bceqMZSpw/x06B9E= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PqzjMLOj; 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="PqzjMLOj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DCD7C4AF0C; Tue, 2 Jul 2024 09:10:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719911408; bh=I7mD3dENF4HZBNBumoLyPjANfOtz0e/DAq7U9sRqLk0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PqzjMLOjXeye9zq/mHzTj6Cl4RxSudqszFKsPx54AmE/tJ+OHgWu5ivCnN1LbBRUN 1Yv5vxJ4cXclv2ETPV3ZWWpK913fTcXr7yVC/nJo7AtJ6rnu3SJBTnF9+JY89SOEvd TYkrX534Vg7HQIcEHujxARKgvk/nUOly8dQEFeqHVLZriAax5EaH09H4nUGZ/y8Loi vDIjzYbeVRyYivHIMQkPD/nstZnUBJhmQWQx2JPLSSZymUewhzPZooZ7yJC7ufM6es ONXggsrnv88nbqTGWDYThjoAZxFxhMpavbb+IIZpeIVu2VNBfqxKFRLDEd3u7X+sYd zohrHgWstJ+9w== From: Leon Romanovsky To: Jens Axboe , Jason Gunthorpe , Robin Murphy , Joerg Roedel , Will Deacon , Keith Busch , Christoph Hellwig , "Zeng, Oak" , Chaitanya Kulkarni Cc: Leon Romanvosky , 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 03/18] dma-mapping: check if IOVA can be used Date: Tue, 2 Jul 2024 12:09:33 +0300 Message-ID: <4c479ac482c3bd123a5f999fdff46454a7faa905.1719909395.git.leon@kernel.org> X-Mailer: git-send-email 2.45.2 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: Leon Romanvosky Provide a way to the callers to see if IOVA can be used for specific DMA memory type. Signed-off-by: Leon Romanovsky --- drivers/iommu/dma-iommu.c | 13 ------------- drivers/pci/p2pdma.c | 4 ++-- include/linux/dma-map-ops.h | 21 +++++++++++++++++++++ include/linux/dma-mapping.h | 10 ++++++++++ kernel/dma/mapping.c | 32 ++++++++++++++++++++++++++++++++ 5 files changed, 65 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 43520e7275cc..89e34503e0bb 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -597,19 +597,6 @@ static int iova_reserve_iommu_regions(struct device *dev, return ret; } -static bool dev_is_untrusted(struct device *dev) -{ - return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; -} - -static bool dev_use_swiotlb(struct device *dev, size_t size, - enum dma_data_direction dir) -{ - return IS_ENABLED(CONFIG_SWIOTLB) && - (dev_is_untrusted(dev) || - dma_kmalloc_needs_bounce(dev, size, dir)); -} - static bool dev_use_sg_swiotlb(struct device *dev, struct scatterlist *sg, int nents, enum dma_data_direction dir) { diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index 4f47a13cb500..6ceea32bb041 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -964,8 +964,8 @@ 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) +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/dma-map-ops.h b/include/linux/dma-map-ops.h index 23e5e2f63a1c..b52e9c8db241 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -9,6 +9,7 @@ #include #include #include +#include struct cma; struct iommu_ops; @@ -348,6 +349,19 @@ static inline bool dma_kmalloc_needs_bounce(struct device *dev, size_t size, return !dma_kmalloc_safe(dev, dir) && !dma_kmalloc_size_aligned(size); } +static inline bool dev_is_untrusted(struct device *dev) +{ + return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; +} + +static inline bool dev_use_swiotlb(struct device *dev, size_t size, + enum dma_data_direction dir) +{ + return IS_ENABLED(CONFIG_SWIOTLB) && + (dev_is_untrusted(dev) || + dma_kmalloc_needs_bounce(dev, size, dir)); +} + void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs); void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, @@ -514,6 +528,8 @@ struct pci_p2pdma_map_state { enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, struct scatterlist *sg); +enum pci_p2pdma_map_type pci_p2pdma_map_type(struct dev_pagemap *pgmap, + struct device *dev); #else /* CONFIG_PCI_P2PDMA */ static inline enum pci_p2pdma_map_type pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, @@ -521,6 +537,11 @@ pci_p2pdma_map_segment(struct pci_p2pdma_map_state *state, struct device *dev, { return PCI_P2PDMA_MAP_NOT_SUPPORTED; } +static inline enum pci_p2pdma_map_type +pci_p2pdma_map_type(struct dev_pagemap *pgmap, struct device *dev) +{ + return PCI_P2PDMA_MAP_NOT_SUPPORTED; +} #endif /* CONFIG_PCI_P2PDMA */ #endif /* _LINUX_DMA_MAP_OPS_H */ diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 673ddcf140ff..9d1e020869a6 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -100,6 +100,11 @@ struct dma_iova_attrs { unsigned long attrs; }; +struct dma_iova_state { + struct dma_iova_attrs *iova; + struct dma_memory_type *type; +}; + #ifdef CONFIG_DMA_API_DEBUG void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr); void debug_dma_map_single(struct device *dev, const void *addr, @@ -178,6 +183,7 @@ int dma_mmap_noncontiguous(struct device *dev, struct vm_area_struct *vma, size_t size, struct sg_table *sgt); void dma_get_memory_type(struct page *page, struct dma_memory_type *type); +bool dma_can_use_iova(struct dma_iova_state *state, size_t size); #else /* CONFIG_HAS_DMA */ static inline int dma_alloc_iova(struct dma_iova_attrs *iova) { @@ -319,6 +325,10 @@ static inline void dma_get_memory_type(struct page *page, struct dma_memory_type *type) { } +static inline bool dma_can_use_iova(struct dma_iova_state *state, size_t size) +{ + return false; +} #endif /* CONFIG_HAS_DMA */ #if defined(CONFIG_HAS_DMA) && defined(CONFIG_DMA_NEED_SYNC) diff --git a/kernel/dma/mapping.c b/kernel/dma/mapping.c index 0c8f51010d08..9044ee525fdb 100644 --- a/kernel/dma/mapping.c +++ b/kernel/dma/mapping.c @@ -968,3 +968,35 @@ void dma_free_iova(struct dma_iova_attrs *iova) ops->free_iova(dev, iova->addr, iova->size); } EXPORT_SYMBOL_GPL(dma_free_iova); + +/** + * dma_can_use_iova - check if the device type is valid + * and won't take SWIOTLB path + * @state: IOVA state + * @size: size of the buffer + * + * Return %true if the device should use swiotlb for the given buffer, else + * %false. + */ +bool dma_can_use_iova(struct dma_iova_state *state, size_t size) +{ + struct device *dev = state->iova->dev; + const struct dma_map_ops *ops = get_dma_ops(dev); + struct dma_memory_type *type = state->type; + enum pci_p2pdma_map_type map; + + if (is_swiotlb_force_bounce(dev) || + dev_use_swiotlb(dev, size, state->iova->dir)) + return false; + + if (dma_map_direct(dev, ops) || !ops->alloc_iova) + return false; + + if (type->type == DMA_MEMORY_TYPE_P2P) { + map = pci_p2pdma_map_type(type->p2p_pgmap, dev); + return map == PCI_P2PDMA_MAP_THRU_HOST_BRIDGE; + } + + return type->type == DMA_MEMORY_TYPE_NORMAL; +} +EXPORT_SYMBOL_GPL(dma_can_use_iova);