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The tee_context can be used to manage TEE user resources, including those allocated by the driver for the TEE on behalf of the user. The release() callback is invoked only when all resources, such as tee_shm, are released and there are no references to the tee_context. When a user closes the device file, the driver should notify the TEE to release any resources it may hold and drop the context references. To achieve this, a close_context() callback is introduced to initiate resource release in the TEE driver when the device file is closed. Relocate teedev_ctx_get, teedev_ctx_put, tee_device_get, and tee_device_get functions to tee_core.h to make them accessible outside the TEE subsystem. Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com> Tested-by: Neil Armstrong <neil.armstrong@linaro.org> Tested-by: Harshal Dev <quic_hdev@quicinc.com> Signed-off-by: Amirreza Zarrabi <amirreza.zarrabi@oss.qualcomm.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
36 lines
942 B
C
36 lines
942 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2015-2016, Linaro Limited
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*/
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#ifndef TEE_PRIVATE_H
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#define TEE_PRIVATE_H
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#include <linux/cdev.h>
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#include <linux/completion.h>
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#include <linux/device.h>
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#include <linux/dma-buf.h>
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#include <linux/kref.h>
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#include <linux/mutex.h>
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#include <linux/types.h>
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/* extra references appended to shm object for registered shared memory */
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struct tee_shm_dmabuf_ref {
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struct tee_shm shm;
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size_t offset;
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struct dma_buf *dmabuf;
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struct tee_shm *parent_shm;
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};
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int tee_shm_get_fd(struct tee_shm *shm);
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struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size);
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struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
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unsigned long addr, size_t length);
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int tee_heap_update_from_dma_buf(struct tee_device *teedev,
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struct dma_buf *dmabuf, size_t *offset,
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struct tee_shm *shm,
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struct tee_shm **parent_shm);
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#endif /*TEE_PRIVATE_H*/
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