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Thu, 13 Jun 2019 15:39:31 -0700 (PDT) Received: from localhost.localdomain ([2a02:8084:a0:bc00:8042:d435:a754:1f22]) by smtp.googlemail.com with ESMTPSA id s16sm216522eji.27.2019.06.13.15.39.30 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Thu, 13 Jun 2019 15:39:31 -0700 (PDT) From: Tom Murphy To: iommu@lists.linux-foundation.org Subject: [PATCH v4 3/5] iommu/dma-iommu: Handle deferred devices Date: Thu, 13 Jun 2019 23:38:58 +0100 Message-Id: <20190613223901.9523-4-murphyt7@tcd.ie> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190613223901.9523-1-murphyt7@tcd.ie> References: <20190613223901.9523-1-murphyt7@tcd.ie> MIME-Version: 1.0 Cc: Heiko Stuebner , Will Deacon , virtualization@lists.linux-foundation.org, David Brown , Thierry Reding , linux-s390@vger.kernel.org, linux-samsung-soc@vger.kernel.org, Jean-Philippe Brucker , Krzysztof Kozlowski , Jonathan Hunter , linux-rockchip@lists.infradead.org, Andy Gross , Gerald Schaefer , linux-tegra@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-mediatek@lists.infradead.org, Matthias Brugger , linux-arm-kernel@lists.infradead.org, Robin Murphy , linux-kernel@vger.kernel.org, Tom Murphy , Kukjin Kim , David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org Handle devices which defer their attach to the iommu in the dma-iommu api Signed-off-by: Tom Murphy --- drivers/iommu/dma-iommu.c | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index e64dbbcde63c..f303bbe20e51 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -22,6 +22,7 @@ #include #include #include +#include struct iommu_dma_msi_page { struct list_head list; @@ -351,6 +352,21 @@ static int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base, return iova_reserve_iommu_regions(dev, domain); } +static int handle_deferred_device(struct device *dev, + struct iommu_domain *domain) +{ + const struct iommu_ops *ops = domain->ops; + + if (!is_kdump_kernel()) + return 0; + + if (unlikely(ops->is_attach_deferred && + ops->is_attach_deferred(domain, dev))) + return iommu_attach_device(domain, dev); + + return 0; +} + /** * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API * page flags. @@ -462,6 +478,9 @@ static dma_addr_t __iommu_dma_map(struct device *dev, phys_addr_t phys, size_t iova_off = 0; dma_addr_t iova; + if (unlikely(handle_deferred_device(dev, domain))) + return DMA_MAPPING_ERROR; + if (cookie->type == IOMMU_DMA_IOVA_COOKIE) { iova_off = iova_offset(&cookie->iovad, phys); size = iova_align(&cookie->iovad, size + iova_off); @@ -583,6 +602,9 @@ static void *iommu_dma_alloc_remap(struct device *dev, size_t size, *dma_handle = DMA_MAPPING_ERROR; + if (unlikely(handle_deferred_device(dev, domain))) + return NULL; + min_size = alloc_sizes & -alloc_sizes; if (min_size < PAGE_SIZE) { min_size = PAGE_SIZE; @@ -715,7 +737,7 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, int prot = dma_info_to_prot(dir, coherent, attrs); dma_addr_t dma_handle; - dma_handle =__iommu_dma_map(dev, phys, size, prot); + dma_handle = __iommu_dma_map(dev, phys, size, prot); if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && dma_handle != DMA_MAPPING_ERROR) arch_sync_dma_for_device(dev, phys, size, dir); @@ -825,6 +847,9 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, unsigned long mask = dma_get_seg_boundary(dev); int i; + if (unlikely(handle_deferred_device(dev, domain))) + return 0; + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) iommu_dma_sync_sg_for_device(dev, sg, nents, dir); -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu