C++ (Cpp) arm_iommu_detach_device Examples

Example #1

File: exynos_drm_dma.c Project: avagin/linux

/*
 * drm_iommu_attach_device- attach device to iommu mapping
 *
 * @drm_dev: DRM device
 * @subdrv_dev: device to be attach
 *
 * This function should be called by sub drivers to attach it to iommu
 * mapping.
 */
static int drm_iommu_attach_device(struct drm_device *drm_dev,
				struct device *subdrv_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;
	int ret;

	if (get_dma_ops(priv->dma_dev) != get_dma_ops(subdrv_dev)) {
		DRM_DEV_ERROR(subdrv_dev, "Device %s lacks support for IOMMU\n",
			  dev_name(subdrv_dev));
		return -EINVAL;
	}

	ret = configure_dma_max_seg_size(subdrv_dev);
	if (ret)
		return ret;

	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
		if (to_dma_iommu_mapping(subdrv_dev))
			arm_iommu_detach_device(subdrv_dev);

		ret = arm_iommu_attach_device(subdrv_dev, priv->mapping);
	} else if (IS_ENABLED(CONFIG_IOMMU_DMA)) {
		ret = iommu_attach_device(priv->mapping, subdrv_dev);
	}

	if (ret)
		clear_dma_max_seg_size(subdrv_dev);

	return 0;
}

Example #2

File: tegra.c Project: AlexShiLucky/linux

static void
nvkm_device_tegra_probe_iommu(struct nvkm_device_tegra *tdev)
{
#if IS_ENABLED(CONFIG_IOMMU_API)
	struct device *dev = &tdev->pdev->dev;
	unsigned long pgsize_bitmap;
	int ret;

#if IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)
	if (dev->archdata.mapping) {
		struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);

		arm_iommu_detach_device(dev);
		arm_iommu_release_mapping(mapping);
	}
#endif

	if (!tdev->func->iommu_bit)
		return;

	mutex_init(&tdev->iommu.mutex);

	if (iommu_present(&platform_bus_type)) {
		tdev->iommu.domain = iommu_domain_alloc(&platform_bus_type);
		if (!tdev->iommu.domain)
			goto error;

		/*
		 * A IOMMU is only usable if it supports page sizes smaller
		 * or equal to the system's PAGE_SIZE, with a preference if
		 * both are equal.
		 */
		pgsize_bitmap = tdev->iommu.domain->ops->pgsize_bitmap;
		if (pgsize_bitmap & PAGE_SIZE) {
			tdev->iommu.pgshift = PAGE_SHIFT;
		} else {
			tdev->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
			if (tdev->iommu.pgshift == 0) {
				dev_warn(dev, "unsupported IOMMU page size\n");
				goto free_domain;
			}
			tdev->iommu.pgshift -= 1;
		}

		ret = iommu_attach_device(tdev->iommu.domain, dev);
		if (ret)
			goto free_domain;

		ret = nvkm_mm_init(&tdev->iommu.mm, 0, 0,
				   (1ULL << tdev->func->iommu_bit) >>
				   tdev->iommu.pgshift, 1);
		if (ret)
			goto detach_device;
	}

Example #3

File: exynos_drm_dma.c Project: avagin/linux

/*
 * drm_iommu_detach_device -detach device address space mapping from device
 *
 * @drm_dev: DRM device
 * @subdrv_dev: device to be detached
 *
 * This function should be called by sub drivers to detach it from iommu
 * mapping
 */
static void drm_iommu_detach_device(struct drm_device *drm_dev,
				struct device *subdrv_dev)
{
	struct exynos_drm_private *priv = drm_dev->dev_private;

	if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU))
		arm_iommu_detach_device(subdrv_dev);
	else if (IS_ENABLED(CONFIG_IOMMU_DMA))
		iommu_detach_device(priv->mapping, subdrv_dev);

	clear_dma_max_seg_size(subdrv_dev);
}

Example #4

File: rockchip_drm_drv.c Project: 020gzh/linux

void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
				    struct device *dev)
{
	arm_iommu_detach_device(dev);
}