From mboxrd@z Thu Jan 1 00:00:00 1970 From: thierry.reding@gmail.com (Thierry Reding) Date: Wed, 25 Apr 2018 12:10:48 +0200 Subject: [PATCH v2 2/5] dma-mapping: Introduce dma_iommu_detach_device() API In-Reply-To: <20180425101051.15349-1-thierry.reding@gmail.com> References: <20180425101051.15349-1-thierry.reding@gmail.com> Message-ID: <20180425101051.15349-2-thierry.reding@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Thierry Reding The dma_iommu_detach_device() API can be used by drivers to forcibly detach a device from an IOMMU that architecture code might have attached to. This is useful for drivers that need explicit control over the IOMMU using the IOMMU API directly. Signed-off-by: Thierry Reding --- drivers/base/dma-mapping.c | 8 ++++++++ include/linux/dma-mapping.h | 2 ++ 2 files changed, 10 insertions(+) diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index d82566d6e237..18ddf32b10c9 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -366,3 +366,11 @@ void dma_deconfigure(struct device *dev) of_dma_deconfigure(dev); acpi_dma_deconfigure(dev); } + +void dma_iommu_detach_device(struct device *dev) +{ +#ifdef arch_iommu_detach_device + arch_iommu_detach_device(dev); +#endif +} +EXPORT_SYMBOL(dma_iommu_detach_device); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index f8ab1c0f589e..732191a2c64e 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -671,6 +671,8 @@ static inline void arch_setup_dma_ops(struct device *dev, u64 dma_base, static inline void arch_teardown_dma_ops(struct device *dev) { } #endif +extern void dma_iommu_detach_device(struct device *dev); + static inline unsigned int dma_get_max_seg_size(struct device *dev) { if (dev->dma_parms && dev->dma_parms->max_segment_size) -- 2.17.0