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 size_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 != count) 162 return size > 0 ? -EFAULT : size; 163 164 memset(priv->rx_buffer, 0, priv->max_msg_size); 165 166 ret = sof_msg_inject_send_message(cdev); 167 168 /* return the error code if test failed */ 169 if (ret < 0) 170 size = ret; 171 172 return size; 173 }; 174 175 static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file, 176 const char __user *buffer, 177 size_t count, loff_t *ppos) 178 { 179 struct sof_client_dev *cdev = file->private_data; 180 struct sof_msg_inject_priv *priv = cdev->data; 181 struct sof_ipc4_msg *ipc4_msg = priv->tx_buffer; 182 size_t size; 183 int ret; 184 185 if (*ppos) 186 return 0; 187 188 if (count < sizeof(ipc4_msg->header_u64)) 189 return -EINVAL; 190 191 /* copy the header first */ 192 size = simple_write_to_buffer(&ipc4_msg->header_u64, 193 sizeof(ipc4_msg->header_u64), 194 ppos, buffer, count); 195 if (size != sizeof(ipc4_msg->header_u64)) 196 return size > 0 ? -EFAULT : size; 197 198 count -= size; 199 if (!count) { 200 /* Copy the payload */ 201 size = simple_write_to_buffer(ipc4_msg->data_ptr, 202 priv->max_msg_size, ppos, buffer, 203 count); 204 if (size != count) 205 return size > 0 ? -EFAULT : size; 206 } 207 208 ipc4_msg->data_size = count; 209 210 /* Initialize the reply storage */ 211 ipc4_msg = priv->rx_buffer; 212 ipc4_msg->header_u64 = 0; 213 ipc4_msg->data_size = priv->max_msg_size; 214 memset(ipc4_msg->data_ptr, 0, priv->max_msg_size); 215 216 ret = sof_msg_inject_send_message(cdev); 217 218 /* return the error code if test failed */ 219 if (ret < 0) 220 size = ret; 221 222 return size; 223 }; 224 225 static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file) 226 { 227 debugfs_file_put(file->f_path.dentry); 228 229 return 0; 230 } 231 232 static const struct file_operations sof_msg_inject_fops = { 233 .open = sof_msg_inject_dfs_open, 234 .read = sof_msg_inject_dfs_read, 235 .write = sof_msg_inject_dfs_write, 236 .llseek = default_llseek, 237 .release = sof_msg_inject_dfs_release, 238 239 .owner = THIS_MODULE, 240 }; 241 242 static const struct file_operations sof_msg_inject_ipc4_fops = { 243 .open = sof_msg_inject_dfs_open, 244 .read = sof_msg_inject_ipc4_dfs_read, 245 .write = sof_msg_inject_ipc4_dfs_write, 246 .llseek = default_llseek, 247 .release = sof_msg_inject_dfs_release, 248 249 .owner = THIS_MODULE, 250 }; 251 252 static int sof_msg_inject_probe(struct auxiliary_device *auxdev, 253 const struct auxiliary_device_id *id) 254 { 255 struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev); 256 struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev); 257 static const struct file_operations *fops; 258 struct device *dev = &auxdev->dev; 259 struct sof_msg_inject_priv *priv; 260 size_t alloc_size; 261 262 /* allocate memory for client data */ 263 priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL); 264 if (!priv) 265 return -ENOMEM; 266 267 priv->ipc_type = sof_client_get_ipc_type(cdev); 268 priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev); 269 alloc_size = priv->max_msg_size; 270 271 if (priv->ipc_type == SOF_INTEL_IPC4) 272 alloc_size += sizeof(struct sof_ipc4_msg); 273 274 priv->tx_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL); 275 priv->rx_buffer = devm_kzalloc(dev, alloc_size, GFP_KERNEL); 276 if (!priv->tx_buffer || !priv->rx_buffer) 277 return -ENOMEM; 278 279 if (priv->ipc_type == SOF_INTEL_IPC4) { 280 struct sof_ipc4_msg *ipc4_msg; 281 282 ipc4_msg = priv->tx_buffer; 283 ipc4_msg->data_ptr = priv->tx_buffer + sizeof(struct sof_ipc4_msg); 284 285 ipc4_msg = priv->rx_buffer; 286 ipc4_msg->data_ptr = priv->rx_buffer + sizeof(struct sof_ipc4_msg); 287 288 fops = &sof_msg_inject_ipc4_fops; 289 } else { 290 fops = &sof_msg_inject_fops; 291 } 292 293 cdev->data = priv; 294 295 priv->dfs_file = debugfs_create_file("ipc_msg_inject", 0644, debugfs_root, 296 cdev, fops); 297 298 /* enable runtime PM */ 299 pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS); 300 pm_runtime_use_autosuspend(dev); 301 pm_runtime_enable(dev); 302 pm_runtime_mark_last_busy(dev); 303 pm_runtime_idle(dev); 304 305 return 0; 306 } 307 308 static void sof_msg_inject_remove(struct auxiliary_device *auxdev) 309 { 310 struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev); 311 struct sof_msg_inject_priv *priv = cdev->data; 312 313 pm_runtime_disable(&auxdev->dev); 314 315 debugfs_remove(priv->dfs_file); 316 } 317 318 static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = { 319 { .name = "snd_sof.msg_injector" }, 320 {}, 321 }; 322 MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table); 323 324 /* 325 * No need for driver pm_ops as the generic pm callbacks in the auxiliary bus 326 * type are enough to ensure that the parent SOF device resumes to bring the DSP 327 * back to D0. 328 * Driver name will be set based on KBUILD_MODNAME. 329 */ 330 static struct auxiliary_driver sof_msg_inject_client_drv = { 331 .probe = sof_msg_inject_probe, 332 .remove = sof_msg_inject_remove, 333 334 .id_table = sof_msg_inject_client_id_table, 335 }; 336 337 module_auxiliary_driver(sof_msg_inject_client_drv); 338 339 MODULE_DESCRIPTION("SOF IPC Message Injector Client Driver"); 340 MODULE_LICENSE("GPL"); 341 MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT); 342