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https://github.com/linux-msm/laptops-kernel.git
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Vikash GarodiaandAbel Vesa
cb3f5a0957
On glymur platform, firmware loading needs a separate IOMMU mapping with its own stream ID. This stream ID is defined in the device tree with the associated firmware function ID in the iommu-map property. To create this mapping, a separate child device is needed so the firmware memory can be isolated in its own IOMMU context. Introduce a new bus called iris-vpu-bus. This creates a dynamic device, and its dma_configure() callback calls of_dma_configure_id() with the function ID provided by the client to map the corresponding stream ID. This sets up a dedicated IOMMU context for the child device. Reviewed-by: Vishnu Reddy <busanna.reddy@oss.qualcomm.com> Signed-off-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> Signed-off-by: Vishnu Reddy <busanna.reddy@oss.qualcomm.com>
26 lines
659 B
C
26 lines
659 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#ifndef _LINUX_IRIS_VPU_BUS_H
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#define _LINUX_IRIS_VPU_BUS_H
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#include <linux/device.h>
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#ifdef CONFIG_QCOM_IRIS_VPU_BUS
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extern const struct bus_type iris_vpu_bus_type;
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struct device *iris_vpu_bus_create_device(struct device *parent_device, const char *name,
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u64 dma_mask, const u32 *iommu_fid);
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#else
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static inline struct device *iris_vpu_bus_create_device(struct device *parent_device,
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const char *name, u64 dma_mask,
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const u32 *iommu_fid)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif
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#endif /* _LINUX_IRIS_VPU_BUS_H */
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