sound/soc/sof/sof-client-ipc-msg-injector.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 //
   3 // Copyright(c) 2022 Intel Corporation. All rights reserved.
   4 //
   5 // Author: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
   6 //
   7
   8 #include <linux/auxiliary_bus.h>
   9 #include <linux/completion.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/ktime.h>
  12 #include <linux/mod_devicetable.h>
  13 #include <linux/module.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/slab.h>
  16 #include <linux/uaccess.h>
  17 #include <sound/sof/header.h>
  18 #include <sound/sof/ipc4/header.h>
  19
  20 #include "sof-client.h"
  21
  22 #define SOF_IPC_CLIENT_SUSPEND_DELAY_MS 3000
  23
  24 struct sof_msg_inject_priv {
  25         struct dentry *dfs_file;
  26         size_t max_msg_size;
  27         enum sof_ipc_type ipc_type;
  28
  29         void *tx_buffer;
  30         void *rx_buffer;
  31 };
  32
  33 static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file)
  34 {
  35         struct sof_client_dev *cdev = inode->i_private;
  36         int ret;
  37
  38         if (sof_client_get_fw_state(cdev) == SOF_FW_CRASHED)
  39                 return -ENODEV;
  40
  41         ret = debugfs_file_get(file->f_path.dentry);
  42         if (unlikely(ret))
  43                 return ret;
  44
  45         ret = simple_open(inode, file);
  46         if (ret)
  47                 debugfs_file_put(file->f_path.dentry);
  48
  49         return ret;
  50 }
  51
  52 static ssize_t sof_msg_inject_dfs_read(struct file *file, char __user *buffer,
  53                                        size_t count, loff_t *ppos)
  54 {
  55         struct sof_client_dev *cdev = file->private_data;
  56         struct sof_msg_inject_priv *priv = cdev->data;
  57         struct sof_ipc_reply *rhdr = priv->rx_buffer;
  58
  59         if (!rhdr->hdr.size || !count || *ppos)
  60                 return 0;
  61
  62         if (count > rhdr->hdr.size)
  63                 count = rhdr->hdr.size;
  64
  65         if (copy_to_user(buffer, priv->rx_buffer, count))
  66                 return -EFAULT;
  67
  68         *ppos += count;
  69         return count;
  70 }
  71
  72 static ssize_t sof_msg_inject_ipc4_dfs_read(struct file *file,
  73                                             char __user *buffer,
  74                                             size_t count, loff_t *ppos)
  75 {
  76         struct sof_client_dev *cdev = file->private_data;
  77         struct sof_msg_inject_priv *priv = cdev->data;
  78         struct sof_ipc4_msg *ipc4_msg = priv->rx_buffer;
  79         size_t header_size = sizeof(ipc4_msg->header_u64);
  80         size_t remaining;
  81
  82         if (!ipc4_msg->header_u64 || !count || *ppos)
  83                 return 0;
  84
  85         /* we need space for the header at minimum (u64) */
  86         if (count < header_size)
  87                 return -ENOSPC;
  88
  89         remaining = header_size;
  90
  91         /* Only get large config have payload */
  92         if (SOF_IPC4_MSG_IS_MODULE_MSG(ipc4_msg->primary) &&
  93             (SOF_IPC4_MSG_TYPE_GET(ipc4_msg->primary) == SOF_IPC4_MOD_LARGE_CONFIG_GET))
  94                 remaining += ipc4_msg->data_size;
  95
  96         if (count > remaining)
  97                 count = remaining;
  98         else if (count < remaining)
  99                 remaining = count;
 100
 101         /* copy the header first */
 102         if (copy_to_user(buffer, &ipc4_msg->header_u64, header_size))
 103                 return -EFAULT;
 104
 105         *ppos += header_size;
 106         remaining -= header_size;
 107
 108         if (!remaining)
 109                 return count;
 110
 111         if (remaining > ipc4_msg->data_size)
 112                 remaining = ipc4_msg->data_size;
 113
 114         /* Copy the payload */
 115         if (copy_to_user(buffer + *ppos, ipc4_msg->data_ptr, remaining))
 116                 return -EFAULT;
 117
 118         *ppos += remaining;
 119         return count;
 120 }
 121
 122 static int sof_msg_inject_send_message(struct sof_client_dev *cdev)
 123 {
 124         struct sof_msg_inject_priv *priv = cdev->data;
 125         struct device *dev = &cdev->auxdev.dev;
 126         int ret, err;
 127
 128         ret = pm_runtime_resume_and_get(dev);
 129         if (ret < 0 && ret != -EACCES) {
 130                 dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);
 131                 return ret;
 132         }
 133
 134         /* send the message */
 135         ret = sof_client_ipc_tx_message(cdev, priv->tx_buffer, priv->rx_buffer,
 136                                         priv->max_msg_size);
 137         if (ret)
 138                 dev_err(dev, "IPC message send failed: %d\n", ret);
 139
 140         pm_runtime_mark_last_busy(dev);
 141         err = pm_runtime_put_autosuspend(dev);
 142         if (err < 0)
 143                 dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err);
 144
 145         return ret;
 146 }
 147
 148 static ssize_t sof_msg_inject_dfs_write(struct file *file, const char __user *buffer,
 149                                         size_t count, loff_t *ppos)
 150 {
 151         struct sof_client_dev *cdev = file->private_data;
 152         struct sof_msg_inject_priv *priv = cdev->data;
 153         ssize_t size;
 154         int ret;
 155
 156         if (*ppos)
 157                 return 0;
 158
 159         size = simple_write_to_buffer(priv->tx_buffer, priv->max_msg_size,
 160                                       ppos, buffer, count);
 161         if (size < 0)
 162                 return size;
 163         if (size != count)
 164                 return -EFAULT;
 165
 166         memset(priv->rx_buffer, 0, priv->max_msg_size);
 167
 168         ret = sof_msg_inject_send_message(cdev);
 169
 170         /* return the error code if test failed */
 171         if (ret < 0)
 172                 size = ret;
 173
 174         return size;
 175 };
 176
 177 static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file,
 178                                              const char __user *buffer,
 179                                              size_t count, loff_t *ppos)
 180 {
 181         struct sof_client_dev *cdev = file->private_data;
 182         struct sof_msg_inject_priv *priv = cdev->data;
 183         struct sof_ipc4_msg *ipc4_msg = priv->tx_buffer;
 184         size_t data_size;
 185         int ret;
 186
 187         if (*ppos)
 188                 return 0;
 189
 190         if (count < sizeof(ipc4_msg->header_u64))
 191                 return -EINVAL;
 192
 193         /* copy the header first */
 194         if (copy_from_user(&ipc4_msg->header_u64, buffer,
 195                            sizeof(ipc4_msg->header_u64)))
 196                 return -EFAULT;
 197
 198         data_size = count - sizeof(ipc4_msg->header_u64);
 199         if (data_size > priv->max_msg_size)
 200                 return -EINVAL;
 201
 202         /* Copy the payload */
 203         if (copy_from_user(ipc4_msg->data_ptr,
 204                            buffer + sizeof(ipc4_msg->header_u64), data_size))
 205                 return -EFAULT;
 206
 207         ipc4_msg->data_size = data_size;
 208
 209         /* Initialize the reply storage */
 210         ipc4_msg = priv->rx_buffer;
 211         ipc4_msg->header_u64 = 0;
 212         ipc4_msg->data_size = priv->max_msg_size;
 213         memset(ipc4_msg->data_ptr, 0, priv->max_msg_size);
 214
 215         ret = sof_msg_inject_send_message(cdev);
 216
 217         /* return the error code if test failed */
 218         if (ret < 0)
 219                 return ret;
 220
 221         return count;
 222 };
 223
 224 static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file)
 225 {
 226         debugfs_file_put(file->f_path.dentry);
 227
 228         return 0;
 229 }
 230
 231 static const struct file_operations sof_msg_inject_fops = {
 232         .open = sof_msg_inject_dfs_open,
 233         .read = sof_msg_inject_dfs_read,
 234         .write = sof_msg_inject_dfs_write,
 235         .llseek = default_llseek,
 236         .release = sof_msg_inject_dfs_release,
 237
 238         .owner = THIS_MODULE,
 239 };
 240
 241 static const struct file_operations sof_msg_inject_ipc4_fops = {
 242         .open = sof_msg_inject_dfs_open,
 243         .read = sof_msg_inject_ipc4_dfs_read,
 244         .write = sof_msg_inject_ipc4_dfs_write,
 245         .llseek = default_llseek,
 246         .release = sof_msg_inject_dfs_release,
 247
 248         .owner = THIS_MODULE,
 249 };
 250
 251 static int sof_msg_inject_probe(struct auxiliary_device *auxdev,
 252                                 const struct auxiliary_device_id *id)
 253 {
 254         struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
 255         struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);
 256         static const struct file_operations *fops;
 257         struct device *dev = &auxdev->dev;
 258         struct sof_msg_inject_priv *priv;
 259         size_t alloc_size;
 260
 261         /* allocate memory for client data */
 262         priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);
 263         if (!priv)
 264                 return -ENOMEM;
 265
 266         priv->ipc_type = sof_client_get_ipc_type(cdev);
 267         priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev);
 268         alloc_size = priv->max_msg_size;
 269
 270         if (priv->ipc_type == SOF_INTEL_IPC4)
 271                 alloc_size += sizeof(struct sof_ipc4_msg);
 272
 273         priv->tx_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL);
 274         priv->rx_buffer = devm_kzalloc(dev, alloc_size, GFP_KERNEL);
 275         if (!priv->tx_buffer || !priv->rx_buffer)
 276                 return -ENOMEM;
 277
 278         if (priv->ipc_type == SOF_INTEL_IPC4) {
 279                 struct sof_ipc4_msg *ipc4_msg;
 280
 281                 ipc4_msg = priv->tx_buffer;
 282                 ipc4_msg->data_ptr = priv->tx_buffer + sizeof(struct sof_ipc4_msg);
 283
 284                 ipc4_msg = priv->rx_buffer;
 285                 ipc4_msg->data_ptr = priv->rx_buffer + sizeof(struct sof_ipc4_msg);
 286
 287                 fops = &sof_msg_inject_ipc4_fops;
 288         } else {
 289                 fops = &sof_msg_inject_fops;
 290         }
 291
 292         cdev->data = priv;
 293
 294         priv->dfs_file = debugfs_create_file("ipc_msg_inject", 0644, debugfs_root,
 295                                              cdev, fops);
 296
 297         /* enable runtime PM */
 298         pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);
 299         pm_runtime_use_autosuspend(dev);
 300         pm_runtime_enable(dev);
 301         pm_runtime_mark_last_busy(dev);
 302         pm_runtime_idle(dev);
 303
 304         return 0;
 305 }
 306
 307 static void sof_msg_inject_remove(struct auxiliary_device *auxdev)
 308 {
 309         struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);
 310         struct sof_msg_inject_priv *priv = cdev->data;
 311
 312         pm_runtime_disable(&auxdev->dev);
 313
 314         debugfs_remove(priv->dfs_file);
 315 }
 316
 317 static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {
 318         { .name = "snd_sof.msg_injector" },
 319         {},
 320 };
 321 MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table);
 322
 323 /*
 324  * No need for driver pm_ops as the generic pm callbacks in the auxiliary bus
 325  * type are enough to ensure that the parent SOF device resumes to bring the DSP
 326  * back to D0.
 327  * Driver name will be set based on KBUILD_MODNAME.
 328  */
 329 static struct auxiliary_driver sof_msg_inject_client_drv = {
 330         .probe = sof_msg_inject_probe,
 331         .remove = sof_msg_inject_remove,
 332
 333         .id_table = sof_msg_inject_client_id_table,
 334 };
 335
 336 module_auxiliary_driver(sof_msg_inject_client_drv);
 337
 338 MODULE_DESCRIPTION("SOF IPC Message Injector Client Driver");
 339 MODULE_LICENSE("GPL");
 340 MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);