LXR linux/drivers/gpu/drm/amd/amdgpu/amdgpu

   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
  48void 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
  80void 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.context.mem_context.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#if defined(CONFIG_DEBUG_FS)
  90
  91static 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 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                psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
 125                        TA_SECUREDISPLAY_COMMAND__QUERY_TA);
 126                ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__QUERY_TA);
 127                if (!ret) {
 128                        if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS)
 129                                dev_info(adev->dev, "SECUREDISPLAY: query securedisplay TA ret is 0x%X\n",
 130                                        securedisplay_cmd->securedisplay_out_message.query_ta.query_cmd_ret);
 131                        else
 132                                psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
 133                }
 134                break;
 135        case 2:
 136                psp_prep_securedisplay_cmd_buf(psp, &securedisplay_cmd,
 137                        TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
 138                securedisplay_cmd->securedisplay_in_message.send_roi_crc.phy_id = phy_id;
 139                ret = psp_securedisplay_invoke(psp, TA_SECUREDISPLAY_COMMAND__SEND_ROI_CRC);
 140                if (!ret) {
 141                        if (securedisplay_cmd->status == TA_SECUREDISPLAY_STATUS__SUCCESS) {
 142                                dev_info(adev->dev, "SECUREDISPLAY: I2C buffer out put is: %*ph\n",
 143                                         TA_SECUREDISPLAY_I2C_BUFFER_SIZE,
 144                                         securedisplay_cmd->securedisplay_out_message.send_roi_crc.i2c_buf);
 145                        } else {
 146                                psp_securedisplay_parse_resp_status(psp, securedisplay_cmd->status);
 147                        }
 148                }
 149                break;
 150        default:
 151                dev_err(adev->dev, "Invalid input: %s\n", str);
 152        }
 153
 154        pm_runtime_mark_last_busy(dev->dev);
 155        pm_runtime_put_autosuspend(dev->dev);
 156
 157        return size;
 158}
 159
 160static const struct file_operations amdgpu_securedisplay_debugfs_ops = {
 161        .owner = THIS_MODULE,
 162        .read = NULL,
 163        .write = amdgpu_securedisplay_debugfs_write,
 164        .llseek = default_llseek
 165};
 166
 167#endif
 168
 169void amdgpu_securedisplay_debugfs_init(struct amdgpu_device *adev)
 170{
 171#if defined(CONFIG_DEBUG_FS)
 172
 173        if (!adev->psp.securedisplay_context.context.initialized)
 174                return;
 175
 176        debugfs_create_file("securedisplay_test", S_IWUSR, adev_to_drm(adev)->primary->debugfs_root,
 177                                adev, &amdgpu_securedisplay_debugfs_ops);
 178#endif
 179}
 180