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fade1ec055
With our DMA ops enabled for PCI devices, we should avoid allocating IOVAs which a host bridge might misinterpret as peer-to-peer DMA and lead to faults, corruption or other badness. To be safe, punch out holes for all of the relevant host bridge's windows when initialising a DMA domain for a PCI device. CC: Marek Szyprowski <m.szyprowski@samsung.com> CC: Inki Dae <inki.dae@samsung.com> Reported-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
157 lines
3.5 KiB
C
157 lines
3.5 KiB
C
/* exynos_drm_iommu.h
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* Authoer: Inki Dae <inki.dae@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#ifndef _EXYNOS_DRM_IOMMU_H_
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#define _EXYNOS_DRM_IOMMU_H_
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#define EXYNOS_DEV_ADDR_START 0x20000000
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#define EXYNOS_DEV_ADDR_SIZE 0x40000000
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#ifdef CONFIG_DRM_EXYNOS_IOMMU
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#if defined(CONFIG_ARM_DMA_USE_IOMMU)
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#include <asm/dma-iommu.h>
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static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
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unsigned long start, unsigned long size)
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{
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priv->mapping = arm_iommu_create_mapping(&platform_bus_type, start,
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size);
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return IS_ERR(priv->mapping);
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}
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static inline void
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__exynos_iommu_release_mapping(struct exynos_drm_private *priv)
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{
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arm_iommu_release_mapping(priv->mapping);
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}
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static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
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struct device *dev)
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{
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if (dev->archdata.mapping)
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arm_iommu_detach_device(dev);
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return arm_iommu_attach_device(dev, priv->mapping);
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}
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static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
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struct device *dev)
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{
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arm_iommu_detach_device(dev);
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}
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#elif defined(CONFIG_IOMMU_DMA)
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#include <linux/dma-iommu.h>
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static inline int __exynos_iommu_create_mapping(struct exynos_drm_private *priv,
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unsigned long start, unsigned long size)
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{
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struct iommu_domain *domain;
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int ret;
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domain = iommu_domain_alloc(priv->dma_dev->bus);
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if (!domain)
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return -ENOMEM;
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ret = iommu_get_dma_cookie(domain);
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if (ret)
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goto free_domain;
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ret = iommu_dma_init_domain(domain, start, size, NULL);
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if (ret)
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goto put_cookie;
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priv->mapping = domain;
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return 0;
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put_cookie:
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iommu_put_dma_cookie(domain);
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free_domain:
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iommu_domain_free(domain);
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return ret;
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}
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static inline void __exynos_iommu_release_mapping(struct exynos_drm_private *priv)
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{
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struct iommu_domain *domain = priv->mapping;
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iommu_put_dma_cookie(domain);
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iommu_domain_free(domain);
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priv->mapping = NULL;
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}
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static inline int __exynos_iommu_attach(struct exynos_drm_private *priv,
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struct device *dev)
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{
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struct iommu_domain *domain = priv->mapping;
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return iommu_attach_device(domain, dev);
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}
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static inline void __exynos_iommu_detach(struct exynos_drm_private *priv,
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struct device *dev)
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{
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struct iommu_domain *domain = priv->mapping;
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iommu_detach_device(domain, dev);
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}
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#else
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#error Unsupported architecture and IOMMU/DMA-mapping glue code
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#endif
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int drm_create_iommu_mapping(struct drm_device *drm_dev);
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void drm_release_iommu_mapping(struct drm_device *drm_dev);
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int drm_iommu_attach_device(struct drm_device *drm_dev,
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struct device *subdrv_dev);
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void drm_iommu_detach_device(struct drm_device *dev_dev,
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struct device *subdrv_dev);
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static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
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{
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struct exynos_drm_private *priv = drm_dev->dev_private;
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return priv->mapping ? true : false;
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}
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#else
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static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
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{
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return 0;
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}
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static inline void drm_release_iommu_mapping(struct drm_device *drm_dev)
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{
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}
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static inline int drm_iommu_attach_device(struct drm_device *drm_dev,
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struct device *subdrv_dev)
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{
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return 0;
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}
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static inline void drm_iommu_detach_device(struct drm_device *drm_dev,
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struct device *subdrv_dev)
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{
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}
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static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
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{
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return false;
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}
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#endif
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#endif
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