drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c

   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 }