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(to: str, from: buf, n: size);
108 if (ret)
109 return -EFAULT;
110
111 ret = pm_runtime_get_sync(dev: dev->dev);
112 if (ret < 0) {
113 pm_runtime_put_autosuspend(dev: 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, cmd: &securedisplay_cmd,
126 command_id: TA_SECUREDISPLAY_COMMAND__QUERY_TA);
127 ret = psp_securedisplay_invoke(psp, ta_cmd_id: 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, status: securedisplay_cmd->status);
134 }
135 mutex_unlock(lock: &psp->securedisplay_context.mutex);
136 break;
137 case 2:
138 mutex_lock(&psp->securedisplay_context.mutex);
139 psp_prep_securedisplay_cmd_buf(psp, cmd: &securedisplay_cmd,
140 command_id: 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_cmd_id: 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, status: securedisplay_cmd->status);
150 }
151 }
152 mutex_unlock(lock: &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->dev);
159 pm_runtime_put_autosuspend(dev: 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(name: "securedisplay_test", S_IWUSR, parent: adev_to_drm(adev)->primary->debugfs_root,
181 data: adev, fops: &amdgpu_securedisplay_debugfs_ops);
182#endif
183}
184

source code of linux/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c