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 long len; 102 ssize_t write_ret = size; 103 int ret, nargs; 104 105 if (*pos) 106 return -EINVAL; 107 108 len = strncpy_from_user(str, buf, sizeof(str)); 109 if (len < 0) 110 return -EFAULT; 111 if (len == 0 || len >= sizeof(str)) 112 return -EINVAL; 113 114 ret = pm_runtime_get_sync(dev->dev); 115 if (ret < 0) { 116 pm_runtime_put_autosuspend(dev->dev); 117 return ret; 118 } 119 120 if (len < 3) 121 nargs = sscanf(str, "%u", &op); 122 else 123 nargs = sscanf(str, "%u %u", &op, &phy_id); 124 if (nargs < 1) { 125 write_ret = -EINVAL; 126 goto out; 127 } 128 129 switch (op) { 130 case 1: 131 mutex_lock(&psp->securedisplay_context.mutex); 132 psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, 133 TA_SECUREDISPLAY_COMMAND__QUERY_TA); 134 ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA); 135 if (!ret) { 136 if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) 137 dev_info(adev->dev, "SECUREDISPLAY: query securedisplay TA ret is 0x%X\n", 138 securedisplay_cmd->securedisplay_out_message.query_ta.query_cmd_ret); 139 else 140 psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); 141 } 142 mutex_unlock(&psp->securedisplay_context.mutex); 143 break; 144 case 2: 145 if (nargs < 2 || phy_id >= TA_SECUREDISPLAY_MAX_PHY) { 146 dev_err(adev->dev, "Invalid input: %s\n", str); 147 write_ret = -EINVAL; 148 break; 149 } 150 mutex_lock(&psp->securedisplay_context.mutex); 151 psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd, 152 TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC); 153 securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id; 154 ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC); 155 if (!ret) { 156 if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) { 157 dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is: %*ph\n", 158 TA_SECUREDISPLAY_I2C_BUFFER_SIZE, 159 securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf); 160 } else { 161 psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status); 162 } 163 } 164 mutex_unlock(&psp->securedisplay_context.mutex); 165 break; 166 default: 167 dev_err(adev->dev, "Invalid input: %s\n", str); 168 write_ret = -EINVAL; 169 break; 170 } 171 172 out: 173 pm_runtime_put_autosuspend(dev->dev); 174 175 return write_ret; 176 } 177 178 static const struct file_operations amdgpu_securedisplay_debugfs_ops = { 179 .owner = THIS_MODULE, 180 .read = NULL, 181 .write = amdgpu_securedisplay_debugfs_write, 182 .llseek = default_llseek 183 }; 184 185 #endif 186 187 void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev) 188 { 189 #if defined(CONFIG_DEBUG_FS) 190 191 if (!adev->psp.securedisplay_context.context.initialized) 192 return; 193 194 debugfs_create_file("securedisplay_test", S_IWUSR, adev_to_drm(adev)->primary->debugfs_root, 195 adev, &amdgpu_securedisplay_debugfs_ops); 196 #endif 197 } 198