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 default: 73 dev_err(psp->adev->dev, "Secure display: Failed to parse status: %d\n", status); 74 } 75 } 76 77 void psp_prep_securedisplay_cmd_buf(struct psp_context *psp, struct securedisplay_cmd **cmd, 78 enum ta_securedisplay_command command_id) 79 { 80 *cmd = (struct securedisplay_cmd *)psp->securedisplay_context.securedisplay_shared_buf; 81 memset(*cmd, 0, sizeof(struct securedisplay_cmd)); 82 (*cmd)->status = TA_SECUREDISPLAY_STATUS__GENERIC_FAILURE; 83 (*cmd)->cmd_id = command_id; 84 } 85 86 static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __user *buf, 87 size_t size, loff_t *pos) 88 { 89 struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private; 90 struct psp_context *psp = &adev->psp; 91 struct securedisplay_cmd *securedisplay_cmd; 92 struct drm_device *dev = adev_to_drm(adev); 93 uint32_t phy_id; 94 uint32_t op; 95 int i; 96 char str[64]; 97 char i2c_output[256]; 98 int ret; 99 100 if (*pos || size > sizeof(str) - 1) 101 return -EINVAL; 102 103 memset(str, 0, sizeof(str)); 104 ret = copy_from_user(str, buf, size); 105 if (ret) 106 return -EFAULT; 107 108 ret = pm_runtime_get_sync(dev->dev); 109 if (ret < 0) { 110 pm_runtime_put_autosuspend(dev->dev); 111 return ret; 112 } 113 114 if (size < 3) 115 sscanf(str, "%u ", &op); 116 else 117 sscanf(str, "%u %u", &op, &phy_id); 118 119 switch (op) { 120 case 1: 121 psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, 122 TA_SECUREDISPLAY_COMMAND__QUERY_TA); 123 ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA); 124 if (!ret) { 125 if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) 126 dev_info(adev->dev, "SECUREDISPLAY: query securedisplay TA ret is 0x%X\n", 127 securedisplay_cmd->securedisplay_out_message.query_ta.query_cmd_ret); 128 else 129 psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); 130 } 131 break; 132 case 2: 133 psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, 134 TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC); 135 securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id; 136 ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC); 137 if (!ret) { 138 if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) { 139 memset(i2c_output, 0, sizeof(i2c_output)); 140 for (i = 0; i < TA_SECUREDISPLAY_I2C_BUFFER_SIZE; i++) 141 sprintf(i2c_output, "%s 0x%X", i2c_output, 142 securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf[i]); 143 dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is :%s\n", i2c_output); 144 } else { 145 psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); 146 } 147 } 148 break; 149 default: 150 dev_err(adev->dev, "Invalid input: %s\n", str); 151 } 152 153 pm_runtime_mark_last_busy(dev->dev); 154 pm_runtime_put_autosuspend(dev->dev); 155 156 return size; 157 } 158 159 static const struct file_operations amdgpu_securedisplay_debugfs_ops = { 160 .owner = THIS_MODULE, 161 .read = NULL, 162 .write = amdgpu_securedisplay_debugfs_write, 163 .llseek = default_llseek 164 }; 165 166 void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev) 167 { 168 #if defined(CONFIG_DEBUG_FS) 169 170 if (!adev->psp.securedisplay_context.securedisplay_initialized) 171 return; 172 173 debugfs_create_file("securedisplay_test", S_IWUSR, adev_to_drm(adev)->primary->debugfs_root, 174 adev, &amdgpu_securedisplay_debugfs_ops); 175 #endif 176 } 177