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