eb7a3fc74c
Already drm_iommu_attach_device checks whether support iommu internally. It should clear channels always regardless iommu support. We didn't know because we can detect the problem when iommu is enabled, so we don't have to use drm_iommu_attach_device_if_possible and then we can remove drm_iommu_attach_device_if_possible and clear_channels function pointer. Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com> Tested-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Inki Dae <inki.dae@samsung.com>
145 lines
3.5 KiB
C
145 lines
3.5 KiB
C
/* exynos_drm_iommu.c
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*
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* Copyright (c) 2012 Samsung Electronics Co., Ltd.
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* Author: 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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#include <drmP.h>
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#include <drm/exynos_drm.h>
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#include <linux/dma-mapping.h>
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#include <linux/iommu.h>
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#include <linux/kref.h>
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#include <asm/dma-iommu.h>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_iommu.h"
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/*
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* drm_create_iommu_mapping - create a mapping structure
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*
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* @drm_dev: DRM device
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*/
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int drm_create_iommu_mapping(struct drm_device *drm_dev)
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{
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struct dma_iommu_mapping *mapping = NULL;
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struct exynos_drm_private *priv = drm_dev->dev_private;
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struct device *dev = drm_dev->dev;
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if (!priv->da_start)
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priv->da_start = EXYNOS_DEV_ADDR_START;
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if (!priv->da_space_size)
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priv->da_space_size = EXYNOS_DEV_ADDR_SIZE;
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mapping = arm_iommu_create_mapping(&platform_bus_type, priv->da_start,
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priv->da_space_size);
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if (IS_ERR(mapping))
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return PTR_ERR(mapping);
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dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
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GFP_KERNEL);
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if (!dev->dma_parms)
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goto error;
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dma_set_max_seg_size(dev, 0xffffffffu);
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dev->archdata.mapping = mapping;
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return 0;
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error:
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arm_iommu_release_mapping(mapping);
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return -ENOMEM;
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}
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/*
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* drm_release_iommu_mapping - release iommu mapping structure
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*
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* @drm_dev: DRM device
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*
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* if mapping->kref becomes 0 then all things related to iommu mapping
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* will be released
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*/
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void drm_release_iommu_mapping(struct drm_device *drm_dev)
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{
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struct device *dev = drm_dev->dev;
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arm_iommu_release_mapping(dev->archdata.mapping);
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}
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/*
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* drm_iommu_attach_device- attach device to iommu mapping
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*
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* @drm_dev: DRM device
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* @subdrv_dev: device to be attach
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*
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* This function should be called by sub drivers to attach it to iommu
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* mapping.
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*/
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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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{
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struct device *dev = drm_dev->dev;
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int ret;
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if (!dev->archdata.mapping)
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return 0;
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subdrv_dev->dma_parms = devm_kzalloc(subdrv_dev,
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sizeof(*subdrv_dev->dma_parms),
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GFP_KERNEL);
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if (!subdrv_dev->dma_parms)
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return -ENOMEM;
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dma_set_max_seg_size(subdrv_dev, 0xffffffffu);
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if (subdrv_dev->archdata.mapping)
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arm_iommu_detach_device(subdrv_dev);
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ret = arm_iommu_attach_device(subdrv_dev, dev->archdata.mapping);
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if (ret < 0) {
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DRM_DEBUG_KMS("failed iommu attach.\n");
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return ret;
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}
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/*
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* Set dma_ops to drm_device just one time.
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*
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* The dma mapping api needs device object and the api is used
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* to allocate physial memory and map it with iommu table.
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* If iommu attach succeeded, the sub driver would have dma_ops
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* for iommu and also all sub drivers have same dma_ops.
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*/
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if (get_dma_ops(dev) == get_dma_ops(NULL))
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set_dma_ops(dev, get_dma_ops(subdrv_dev));
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return 0;
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}
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/*
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* drm_iommu_detach_device -detach device address space mapping from device
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*
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* @drm_dev: DRM device
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* @subdrv_dev: device to be detached
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*
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* This function should be called by sub drivers to detach it from iommu
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* mapping
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*/
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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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struct device *dev = drm_dev->dev;
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struct dma_iommu_mapping *mapping = dev->archdata.mapping;
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if (!mapping || !mapping->domain)
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return;
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iommu_detach_device(mapping->domain, subdrv_dev);
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drm_release_iommu_mapping(drm_dev);
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}
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