1/*
2 * Copyright 2021 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 *
23 */
24#include <linux/debugfs.h>
25#include <linux/pm_runtime.h>
26
27#include "amdgpu.h"
28#include "amdgpu_securedisplay.h"
29
30/**
31 * DOC: AMDGPU SECUREDISPLAY debugfs test interface
32 *
33 * how to use?
34 * echo opcode <value> > <debugfs_dir>/dri/xxx/securedisplay_test
35 * eg. echo 1 > <debugfs_dir>/dri/xxx/securedisplay_test
36 * eg. echo 2 phy_id > <debugfs_dir>/dri/xxx/securedisplay_test
37 *
38 * opcode:
39 * 1���Query whether TA is responding used only for validation pupose
40 * 2: Send region of Interest and CRC value to I2C. (uint32)phy_id is
41 * send to determine which DIO scratch register should be used to get
42 * ROI and receive i2c_buf as the output.
43 *
44 * You can refer more detail from header file ta_securedisplay_if.h
45 *
46 */
47
48void psp_securedisplay_parse_resp_status(struct psp_context *psp,
49	enum ta_securedisplay_status status)
50{
51	switch (status) {
52	case TA_SECUREDISPLAY_STATUS__SUCCESS:
53		break;
54	case TA_SECUREDISPLAY_STATUS__GENERIC_FAILURE:
55		dev_err(psp->adev->dev, "Secure display: Generic Failure.");
56		break;
57	case TA_SECUREDISPLAY_STATUS__INVALID_PARAMETER:
58		dev_err(psp->adev->dev, "Secure display: Invalid Parameter.");
59		break;
60	case TA_SECUREDISPLAY_STATUS__NULL_POINTER:
61		dev_err(psp->adev->dev, "Secure display: Null Pointer.");
62		break;
63	case TA_SECUREDISPLAY_STATUS__I2C_WRITE_ERROR:
64		dev_err(psp->adev->dev, "Secure display: Failed to write to I2C.");
65		break;
66	case TA_SECUREDISPLAY_STATUS__READ_DIO_SCRATCH_ERROR:
67		dev_err(psp->adev->dev, "Secure display: Failed to Read DIO Scratch Register.");
68		break;
69	case TA_SECUREDISPLAY_STATUS__READ_CRC_ERROR:
70		dev_err(psp->adev->dev, "Secure display: Failed to Read CRC");
71		break;
72	case TA_SECUREDISPLAY_STATUS__I2C_INIT_ERROR:
73		dev_err(psp->adev->dev, "Secure display: Failed to initialize I2C.");
74		break;
75	default:
76		dev_err(psp->adev->dev, "Secure display: Failed to parse status: %d\n", status);
77	}
78}
79
80void psp_prep_securedisplay_cmd_buf(struct psp_context *psp, struct ta_securedisplay_cmd **cmd,
81	enum ta_securedisplay_command command_id)
82{
83	*cmd = (struct ta_securedisplay_cmd *)psp->securedisplay_context.context.mem_context.shared_buf;
84	memset(*cmd, 0, sizeof(struct ta_securedisplay_cmd));
85	(*cmd)->status = TA_SECUREDISPLAY_STATUS__GENERIC_FAILURE;
86	(*cmd)->cmd_id = command_id;
87}
88
89#if defined(CONFIG_DEBUG_FS)
90
91static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __user *buf,
92		size_t size, loff_t *pos)
93{
94	struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
95	struct psp_context *psp = &adev->psp;
96	struct ta_securedisplay_cmd *securedisplay_cmd;
97	struct drm_device *dev = adev_to_drm(adev);
98	uint32_t phy_id;
99	uint32_t op;
100	char str[64];
101	int ret;
102
103	if (*pos || size > sizeof(str) - 1)
104		return -EINVAL;
105
106	memset(str,  0, sizeof(str));
107	ret = copy_from_user(str, buf, size);
108	if (ret)
109		return -EFAULT;
110
111	ret = pm_runtime_get_sync(dev->dev);
112	if (ret < 0) {
113		pm_runtime_put_autosuspend(dev->dev);
114		return ret;
115	}
116
117	if (size < 3)
118		sscanf(str, "%u ", &op);
119	else
120		sscanf(str, "%u %u", &op, &phy_id);
121
122	switch (op) {
123	case 1:
124		mutex_lock(&psp->securedisplay_context.mutex);
125		psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
126			TA_SECUREDISPLAY_COMMAND__QUERY_TA);
127		ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA);
128		if (!ret) {
129			if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS)
130				dev_info(adev->dev, "SECUREDISPLAY: query securedisplay TA ret is 0x%X\n",
131					securedisplay_cmd->securedisplay_out_message.query_ta.query_cmd_ret);
132			else
133				psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
134		}
135		mutex_unlock(&psp->securedisplay_context.mutex);
136		break;
137	case 2:
138		mutex_lock(&psp->securedisplay_context.mutex);
139		psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
140			TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
141		securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id;
142		ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
143		if (!ret) {
144			if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) {
145				dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is: %*ph\n",
146					 TA_SECUREDISPLAY_I2C_BUFFER_SIZE,
147					 securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf);
148			} else {
149				psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
150			}
151		}
152		mutex_unlock(&psp->securedisplay_context.mutex);
153		break;
154	default:
155		dev_err(adev->dev, "Invalid input: %s\n", str);
156	}
157
158	pm_runtime_mark_last_busy(dev->dev);
159	pm_runtime_put_autosuspend(dev->dev);
160
161	return size;
162}
163
164static const struct file_operations amdgpu_securedisplay_debugfs_ops = {
165	.owner = THIS_MODULE,
166	.read = NULL,
167	.write = amdgpu_securedisplay_debugfs_write,
168	.llseek = default_llseek
169};
170
171#endif
172
173void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev)
174{
175#if defined(CONFIG_DEBUG_FS)
176
177	if (!adev->psp.securedisplay_context.context.initialized)
178		return;
179
180	debugfs_create_file("securedisplay_test", S_IWUSR, adev_to_drm(adev)->primary->debugfs_root,
181				adev, &amdgpu_securedisplay_debugfs_ops);
182#endif
183}
184