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 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 91 static 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 } 163 164 static 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 172 173 void 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