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1// SPDX-License-Identifier: GPL-2.0-only2//3// Copyright(c) 2022 Intel Corporation4//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	300023 24struct 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 33static 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 52static 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 72static 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 122static 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 148static 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 177static 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 224static 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 231static 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 241static 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 251static 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_IPC_TYPE_4)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_IPC_TYPE_4) {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 307static 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 317static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {318	{ .name = "snd_sof.msg_injector" },319	{},320};321MODULE_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 bus325 * type are enough to ensure that the parent SOF device resumes to bring the DSP326 * back to D0.327 * Driver name will be set based on KBUILD_MODNAME.328 */329static 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 336module_auxiliary_driver(sof_msg_inject_client_drv);337 338MODULE_LICENSE("GPL");339MODULE_DESCRIPTION("SOF IPC Message Injector Client Driver");340MODULE_IMPORT_NS(SND_SOC_SOF_CLIENT);341