linux/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c

/*
 * Copyright 2021 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 *
 */
#include <linux/debugfs.h>
#include <linux/pm_runtime.h>

#include "amdgpu.h"
#include "amdgpu_securedisplay.h"

/**
 * DOC: AMDGPU SECUREDISPLAY debugfs test interface
 *
 * how to use?
 * echo opcode <value> > <debugfs_dir>/dri/xxx/securedisplay_test
 * eg. echo 1 > <debugfs_dir>/dri/xxx/securedisplay_test
 * eg. echo 2 phy_id > <debugfs_dir>/dri/xxx/securedisplay_test
 *
 * opcode:
 * 1：Query whether TA is responding used only for validation pupose
 * 2: Send region of Interest and CRC value to I2C. (uint32)phy_id is
 * send to determine which DIO scratch register should be used to get
 * ROI and receive i2c_buf as the output.
 *
 * You can refer more detail from header file ta_securedisplay_if.h
 *
 */

void psp_securedisplay_parse_resp_status(struct psp_context *psp,
	enum ta_securedisplay_status status)
{ … }

void psp_prep_securedisplay_cmd_buf(struct psp_context *psp, struct ta_securedisplay_cmd **cmd,
	enum ta_securedisplay_command command_id)
{ … }

#if defined(CONFIG_DEBUG_FS)

static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __user *buf,
		size_t size, loff_t *pos)
{ … }

static const struct file_operations amdgpu_securedisplay_debugfs_ops = …;

#endif

void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev)
{ … }