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 
48 void 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 
80 void psp_prep_securedisplay_cmd_buf(struct psp_context *psp, struct securedisplay_cmd **cmd,
81 	enum ta_securedisplay_command command_id)
82 {
83 	*cmd = (struct securedisplay_cmd *)psp->securedisplay_context.securedisplay_shared_buf;
84 	memset(*cmd, 0, sizeof(struct securedisplay_cmd));
85 	(*cmd)->status = TA_SECUREDISPLAY_STATUS__GENERIC_FAILURE;
86 	(*cmd)->cmd_id = command_id;
87 }
88 
89 static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __user *buf,
90 		size_t size, loff_t *pos)
91 {
92 	struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
93 	struct psp_context *psp = &adev->psp;
94 	struct securedisplay_cmd *securedisplay_cmd;
95 	struct drm_device *dev = adev_to_drm(adev);
96 	uint32_t phy_id;
97 	uint32_t op;
98 	char str[64];
99 	int ret;
100 
101 	if (*pos || size > sizeof(str) - 1)
102 		return -EINVAL;
103 
104 	memset(str,  0, sizeof(str));
105 	ret = copy_from_user(str, buf, size);
106 	if (ret)
107 		return -EFAULT;
108 
109 	ret = pm_runtime_get_sync(dev->dev);
110 	if (ret < 0) {
111 		pm_runtime_put_autosuspend(dev->dev);
112 		return ret;
113 	}
114 
115 	if (size < 3)
116 		sscanf(str, "%u ", &op);
117 	else
118 		sscanf(str, "%u %u", &op, &phy_id);
119 
120 	switch (op) {
121 	case 1:
122 		psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
123 			TA_SECUREDISPLAY_COMMAND__QUERY_TA);
124 		ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA);
125 		if (!ret) {
126 			if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS)
127 				dev_info(adev->dev, "SECUREDISPLAY: query securedisplay TA ret is 0x%X\n",
128 					securedisplay_cmd->securedisplay_out_message.query_ta.query_cmd_ret);
129 			else
130 				psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
131 		}
132 		break;
133 	case 2:
134 		psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
135 			TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
136 		securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id;
137 		ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
138 		if (!ret) {
139 			if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) {
140 				dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is: %*ph\n",
141 					 TA_SECUREDISPLAY_I2C_BUFFER_SIZE,
142 					 securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf);
143 			} else {
144 				psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
145 			}
146 		}
147 		break;
148 	default:
149 		dev_err(adev->dev, "Invalid input: %s\n", str);
150 	}
151 
152 	pm_runtime_mark_last_busy(dev->dev);
153 	pm_runtime_put_autosuspend(dev->dev);
154 
155 	return size;
156 }
157 
158 static const struct file_operations amdgpu_securedisplay_debugfs_ops = {
159 	.owner = THIS_MODULE,
160 	.read = NULL,
161 	.write = amdgpu_securedisplay_debugfs_write,
162 	.llseek = default_llseek
163 };
164 
165 void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev)
166 {
167 #if defined(CONFIG_DEBUG_FS)
168 
169 	if (!adev->psp.securedisplay_context.securedisplay_initialized)
170 		return;
171 
172 	debugfs_create_file("securedisplay_test", S_IWUSR, adev_to_drm(adev)->primary->debugfs_root,
173 				adev, &amdgpu_securedisplay_debugfs_ops);
174 #endif
175 }
176