// SPDX-License-Identifier: GPL-2.0-only//// Copyright(c) 2022 Intel Corporation//// Author: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>// #include <linux/auxiliary_bus.h>#include <linux/completion.h>#include <linux/debugfs.h>#include <linux/ktime.h>#include <linux/module.h>#include <linux/pm_runtime.h>#include <linux/slab.h>#include <linux/uaccess.h>#include <sound/sof/header.h>#include <sound/sof/ipc4/header.h> #include "sof-client.h" #define SOF_IPC_CLIENT_SUSPEND_DELAY_MS	3000 struct sof_msg_inject_priv {	struct dentry *dfs_file;	size_t max_msg_size;	enum sof_ipc_type ipc_type; 	void *tx_buffer;	void *rx_buffer;}; static int sof_msg_inject_dfs_open(struct inode *inode, struct file *file){	struct sof_client_dev *cdev = inode->i_private;	int ret; 	if (sof_client_get_fw_state(cdev) == SOF_FW_CRASHED)		return -ENODEV; 	ret = debugfs_file_get(file->f_path.dentry);	if (unlikely(ret))		return ret; 	ret = simple_open(inode, file);	if (ret)		debugfs_file_put(file->f_path.dentry); 	return ret;} static ssize_t sof_msg_inject_dfs_read(struct file *file, char __user *buffer,				       size_t count, loff_t *ppos){	struct sof_client_dev *cdev = file->private_data;	struct sof_msg_inject_priv *priv = cdev->data;	struct sof_ipc_reply *rhdr = priv->rx_buffer; 	if (!rhdr->hdr.size || !count || *ppos)		return 0; 	if (count > rhdr->hdr.size)		count = rhdr->hdr.size; 	if (copy_to_user(buffer, priv->rx_buffer, count))		return -EFAULT; 	*ppos += count;	return count;} static ssize_t sof_msg_inject_ipc4_dfs_read(struct file *file,					    char __user *buffer,					    size_t count, loff_t *ppos){	struct sof_client_dev *cdev = file->private_data;	struct sof_msg_inject_priv *priv = cdev->data;	struct sof_ipc4_msg *ipc4_msg = priv->rx_buffer;	size_t header_size = sizeof(ipc4_msg->header_u64);	size_t remaining; 	if (!ipc4_msg->header_u64 || !count || *ppos)		return 0; 	/* we need space for the header at minimum (u64) */	if (count < header_size)		return -ENOSPC; 	remaining = header_size; 	/* Only get large config have payload */	if (SOF_IPC4_MSG_IS_MODULE_MSG(ipc4_msg->primary) &&	    (SOF_IPC4_MSG_TYPE_GET(ipc4_msg->primary) == SOF_IPC4_MOD_LARGE_CONFIG_GET))		remaining += ipc4_msg->data_size; 	if (count > remaining)		count = remaining;	else if (count < remaining)		remaining = count; 	/* copy the header first */	if (copy_to_user(buffer, &ipc4_msg->header_u64, header_size))		return -EFAULT; 	*ppos += header_size;	remaining -= header_size; 	if (!remaining)		return count; 	if (remaining > ipc4_msg->data_size)		remaining = ipc4_msg->data_size; 	/* Copy the payload */	if (copy_to_user(buffer + *ppos, ipc4_msg->data_ptr, remaining))		return -EFAULT; 	*ppos += remaining;	return count;} static int sof_msg_inject_send_message(struct sof_client_dev *cdev){	struct sof_msg_inject_priv *priv = cdev->data;	struct device *dev = &cdev->auxdev.dev;	int ret, err; 	ret = pm_runtime_resume_and_get(dev);	if (ret < 0 && ret != -EACCES) {		dev_err_ratelimited(dev, "debugfs write failed to resume %d\n", ret);		return ret;	} 	ret = sof_client_boot_dsp(cdev);	if (!ret) {		/* send the message */		ret = sof_client_ipc_tx_message(cdev, priv->tx_buffer,						priv->rx_buffer,						priv->max_msg_size);		if (ret)			dev_err(dev, "IPC message send failed: %d\n", ret);	} 	err = pm_runtime_put_autosuspend(dev);	if (err < 0)		dev_err_ratelimited(dev, "debugfs write failed to idle %d\n", err); 	return ret;} static ssize_t sof_msg_inject_dfs_write(struct file *file, const char __user *buffer,					size_t count, loff_t *ppos){	struct sof_client_dev *cdev = file->private_data;	struct sof_msg_inject_priv *priv = cdev->data;	ssize_t size;	int ret; 	if (*ppos)		return 0; 	size = simple_write_to_buffer(priv->tx_buffer, priv->max_msg_size,				      ppos, buffer, count);	if (size < 0)		return size;	if (size != count)		return -EFAULT; 	memset(priv->rx_buffer, 0, priv->max_msg_size); 	ret = sof_msg_inject_send_message(cdev); 	/* return the error code if test failed */	if (ret < 0)		size = ret; 	return size;}; static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file,					     const char __user *buffer,					     size_t count, loff_t *ppos){	struct sof_client_dev *cdev = file->private_data;	struct sof_msg_inject_priv *priv = cdev->data;	struct sof_ipc4_msg *ipc4_msg = priv->tx_buffer;	size_t data_size;	int ret; 	if (*ppos)		return 0; 	if (count < sizeof(ipc4_msg->header_u64))		return -EINVAL; 	/* copy the header first */	if (copy_from_user(&ipc4_msg->header_u64, buffer,			   sizeof(ipc4_msg->header_u64)))		return -EFAULT; 	data_size = count - sizeof(ipc4_msg->header_u64);	if (data_size > priv->max_msg_size)		return -EINVAL; 	/* Copy the payload */	if (copy_from_user(ipc4_msg->data_ptr,			   buffer + sizeof(ipc4_msg->header_u64), data_size))		return -EFAULT; 	ipc4_msg->data_size = data_size; 	/* Initialize the reply storage */	ipc4_msg = priv->rx_buffer;	ipc4_msg->header_u64 = 0;	ipc4_msg->data_size = priv->max_msg_size;	memset(ipc4_msg->data_ptr, 0, priv->max_msg_size); 	ret = sof_msg_inject_send_message(cdev); 	/* return the error code if test failed */	if (ret < 0)		return ret; 	return count;}; static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file){	debugfs_file_put(file->f_path.dentry); 	return 0;} static const struct file_operations sof_msg_inject_fops = {	.open = sof_msg_inject_dfs_open,	.read = sof_msg_inject_dfs_read,	.write = sof_msg_inject_dfs_write,	.llseek = default_llseek,	.release = sof_msg_inject_dfs_release, 	.owner = THIS_MODULE,}; static const struct file_operations sof_msg_inject_ipc4_fops = {	.open = sof_msg_inject_dfs_open,	.read = sof_msg_inject_ipc4_dfs_read,	.write = sof_msg_inject_ipc4_dfs_write,	.llseek = default_llseek,	.release = sof_msg_inject_dfs_release, 	.owner = THIS_MODULE,}; static int sof_msg_inject_probe(struct auxiliary_device *auxdev,				const struct auxiliary_device_id *id){	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);	struct dentry *debugfs_root = sof_client_get_debugfs_root(cdev);	static const struct file_operations *fops;	struct device *dev = &auxdev->dev;	struct sof_msg_inject_priv *priv;	size_t alloc_size; 	/* allocate memory for client data */	priv = devm_kzalloc(&auxdev->dev, sizeof(*priv), GFP_KERNEL);	if (!priv)		return -ENOMEM; 	priv->ipc_type = sof_client_get_ipc_type(cdev);	priv->max_msg_size = sof_client_get_ipc_max_payload_size(cdev);	alloc_size = priv->max_msg_size; 	if (priv->ipc_type == SOF_IPC_TYPE_4)		alloc_size += sizeof(struct sof_ipc4_msg); 	priv->tx_buffer = devm_kmalloc(dev, alloc_size, GFP_KERNEL);	priv->rx_buffer = devm_kzalloc(dev, alloc_size, GFP_KERNEL);	if (!priv->tx_buffer || !priv->rx_buffer)		return -ENOMEM; 	if (priv->ipc_type == SOF_IPC_TYPE_4) {		struct sof_ipc4_msg *ipc4_msg; 		ipc4_msg = priv->tx_buffer;		ipc4_msg->data_ptr = priv->tx_buffer + sizeof(struct sof_ipc4_msg); 		ipc4_msg = priv->rx_buffer;		ipc4_msg->data_ptr = priv->rx_buffer + sizeof(struct sof_ipc4_msg); 		fops = &sof_msg_inject_ipc4_fops;	} else {		fops = &sof_msg_inject_fops;	} 	cdev->data = priv; 	priv->dfs_file = debugfs_create_file("ipc_msg_inject", 0644, debugfs_root,					     cdev, fops); 	/* enable runtime PM */	pm_runtime_set_autosuspend_delay(dev, SOF_IPC_CLIENT_SUSPEND_DELAY_MS);	pm_runtime_use_autosuspend(dev);	pm_runtime_enable(dev);	pm_runtime_mark_last_busy(dev);	pm_runtime_idle(dev); 	return 0;} static void sof_msg_inject_remove(struct auxiliary_device *auxdev){	struct sof_client_dev *cdev = auxiliary_dev_to_sof_client_dev(auxdev);	struct sof_msg_inject_priv *priv = cdev->data; 	pm_runtime_disable(&auxdev->dev); 	debugfs_remove(priv->dfs_file);} static const struct auxiliary_device_id sof_msg_inject_client_id_table[] = {	{ .name = "snd_sof.msg_injector" },	{},};MODULE_DEVICE_TABLE(auxiliary, sof_msg_inject_client_id_table); /* * No need for driver pm_ops as the generic pm callbacks in the auxiliary bus * type are enough to ensure that the parent SOF device resumes to bring the DSP * back to D0. * Driver name will be set based on KBUILD_MODNAME. */static struct auxiliary_driver sof_msg_inject_client_drv = {	.probe = sof_msg_inject_probe,	.remove = sof_msg_inject_remove, 	.id_table = sof_msg_inject_client_id_table,}; module_auxiliary_driver(sof_msg_inject_client_drv); MODULE_LICENSE("GPL");MODULE_DESCRIPTION("SOF IPC Message Injector Client Driver");MODULE_IMPORT_NS("SND_SOC_SOF_CLIENT");