Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
 * Intel Management Engine Interface (Intel MEI) Linux driver
 */
 
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/sched/signal.h>
#include <linux/uuid.h>
#include <linux/compat.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
 
#include <linux/mei.h>
 
#include "mei_dev.h"
#include "client.h"
 
static struct class *mei_class;
static dev_t mei_devt;
#define MEI_MAX_DEVS  MINORMASK
static DEFINE_MUTEX(mei_minor_lock);
static DEFINE_IDR(mei_idr);
 
/**
 * mei_open - the open function
 *
 * @inode: pointer to inode structure
 * @file: pointer to file structure
 *
 * Return: 0 on success, <0 on error
 */
static int mei_open(struct inode *inode, struct file *file)
{
<------>struct mei_device *dev;
<------>struct mei_cl *cl;
 
<------>int err;
 
<------>dev = container_of(inode->i_cdev, struct mei_device, cdev);
<------>if (!dev)
<------><------>return -ENODEV;
 
<------>mutex_lock(&dev->device_lock);
 
<------>if (dev->dev_state != MEI_DEV_ENABLED) {
<------><------>dev_dbg(dev->dev, "dev_state != MEI_ENABLED  dev_state = %s\n",
<------><------>    mei_dev_state_str(dev->dev_state));
<------><------>err = -ENODEV;
<------><------>goto err_unlock;
<------>}
 
<------>cl = mei_cl_alloc_linked(dev);
<------>if (IS_ERR(cl)) {
<------><------>err = PTR_ERR(cl);
<------><------>goto err_unlock;
<------>}
 
<------>cl->fp = file;
<------>file->private_data = cl;
 
<------>mutex_unlock(&dev->device_lock);
 
<------>return nonseekable_open(inode, file);
 
err_unlock:
<------>mutex_unlock(&dev->device_lock);
<------>return err;
}
 
/**
 * mei_cl_vtag_remove_by_fp - remove vtag that corresponds to fp from list
 *
 * @cl: host client
 * @fp: pointer to file structure
 *
 */
static void mei_cl_vtag_remove_by_fp(const struct mei_cl *cl,
<------><------><------><------>     const struct file *fp)
{
<------>struct mei_cl_vtag *vtag_l, *next;
 
<------>list_for_each_entry_safe(vtag_l, next, &cl->vtag_map, list) {
<------><------>if (vtag_l->fp == fp) {
<------><------><------>list_del(&vtag_l->list);
<------><------><------>kfree(vtag_l);
<------><------><------>return;
<------><------>}
<------>}
}
 
/**
 * mei_release - the release function
 *
 * @inode: pointer to inode structure
 * @file: pointer to file structure
 *
 * Return: 0 on success, <0 on error
 */
static int mei_release(struct inode *inode, struct file *file)
{
<------>struct mei_cl *cl = file->private_data;
<------>struct mei_device *dev;
<------>int rets;
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return -ENODEV;
 
<------>dev = cl->dev;
 
<------>mutex_lock(&dev->device_lock);
 
<------>mei_cl_vtag_remove_by_fp(cl, file);
 
<------>if (!list_empty(&cl->vtag_map)) {
<------><------>cl_dbg(dev, cl, "not the last vtag\n");
<------><------>mei_cl_flush_queues(cl, file);
<------><------>rets = 0;
<------><------>goto out;
<------>}
 
<------>rets = mei_cl_disconnect(cl);
<------>/*
<------> * Check again: This is necessary since disconnect releases the lock
<------> * and another client can connect in the meantime.
<------> */
<------>if (!list_empty(&cl->vtag_map)) {
<------><------>cl_dbg(dev, cl, "not the last vtag after disconnect\n");
<------><------>mei_cl_flush_queues(cl, file);
<------><------>goto out;
<------>}
 
<------>mei_cl_flush_queues(cl, NULL);
<------>cl_dbg(dev, cl, "removing\n");
 
<------>mei_cl_unlink(cl);
<------>kfree(cl);
 
out:
<------>file->private_data = NULL;
 
<------>mutex_unlock(&dev->device_lock);
<------>return rets;
}
 
 
/**
 * mei_read - the read function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * Return: >=0 data length on success , <0 on error
 */
static ssize_t mei_read(struct file *file, char __user *ubuf,
<------><------><------>size_t length, loff_t *offset)
{
<------>struct mei_cl *cl = file->private_data;
<------>struct mei_device *dev;
<------>struct mei_cl_cb *cb = NULL;
<------>bool nonblock = !!(file->f_flags & O_NONBLOCK);
<------>ssize_t rets;
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return -ENODEV;
 
<------>dev = cl->dev;
 
 
<------>mutex_lock(&dev->device_lock);
<------>if (dev->dev_state != MEI_DEV_ENABLED) {
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>if (length == 0) {
<------><------>rets = 0;
<------><------>goto out;
<------>}
 
<------>if (ubuf == NULL) {
<------><------>rets = -EMSGSIZE;
<------><------>goto out;
<------>}
 
<------>cb = mei_cl_read_cb(cl, file);
<------>if (cb)
<------><------>goto copy_buffer;
 
<------>if (*offset > 0)
<------><------>*offset = 0;
 
<------>rets = mei_cl_read_start(cl, length, file);
<------>if (rets && rets != -EBUSY) {
<------><------>cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets);
<------><------>goto out;
<------>}
 
<------>if (nonblock) {
<------><------>rets = -EAGAIN;
<------><------>goto out;
<------>}
 
<------>mutex_unlock(&dev->device_lock);
<------>if (wait_event_interruptible(cl->rx_wait,
<------><------><------><------>     mei_cl_read_cb(cl, file) ||
<------><------><------><------>     !mei_cl_is_connected(cl))) {
<------><------>if (signal_pending(current))
<------><------><------>return -EINTR;
<------><------>return -ERESTARTSYS;
<------>}
<------>mutex_lock(&dev->device_lock);
 
<------>if (!mei_cl_is_connected(cl)) {
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>cb = mei_cl_read_cb(cl, file);
<------>if (!cb) {
<------><------>rets = 0;
<------><------>goto out;
<------>}
 
copy_buffer:
<------>/* now copy the data to user space */
<------>if (cb->status) {
<------><------>rets = cb->status;
<------><------>cl_dbg(dev, cl, "read operation failed %zd\n", rets);
<------><------>goto free;
<------>}
 
<------>cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n",
<------>       cb->buf.size, cb->buf_idx, *offset);
<------>if (*offset >= cb->buf_idx) {
<------><------>rets = 0;
<------><------>goto free;
<------>}
 
<------>/* length is being truncated to PAGE_SIZE,
<------> * however buf_idx may point beyond that */
<------>length = min_t(size_t, length, cb->buf_idx - *offset);
 
<------>if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
<------><------>dev_dbg(dev->dev, "failed to copy data to userland\n");
<------><------>rets = -EFAULT;
<------><------>goto free;
<------>}
 
<------>rets = length;
<------>*offset += length;
<------>/* not all data was read, keep the cb */
<------>if (*offset < cb->buf_idx)
<------><------>goto out;
 
free:
<------>mei_cl_del_rd_completed(cl, cb);
<------>*offset = 0;
 
out:
<------>cl_dbg(dev, cl, "end mei read rets = %zd\n", rets);
<------>mutex_unlock(&dev->device_lock);
<------>return rets;
}
 
/**
 * mei_cl_vtag_by_fp - obtain the vtag by file pointer
 *
 * @cl: host client
 * @fp: pointer to file structure
 *
 * Return: vtag value on success, otherwise 0
 */
static u8 mei_cl_vtag_by_fp(const struct mei_cl *cl, const struct file *fp)
{
<------>struct mei_cl_vtag *cl_vtag;
 
<------>if (!fp)
<------><------>return 0;
 
<------>list_for_each_entry(cl_vtag, &cl->vtag_map, list)
<------><------>if (cl_vtag->fp == fp)
<------><------><------>return cl_vtag->vtag;
<------>return 0;
}
 
/**
 * mei_write - the write function.
 *
 * @file: pointer to file structure
 * @ubuf: pointer to user buffer
 * @length: buffer length
 * @offset: data offset in buffer
 *
 * Return: >=0 data length on success , <0 on error
 */
static ssize_t mei_write(struct file *file, const char __user *ubuf,
<------><------><------> size_t length, loff_t *offset)
{
<------>struct mei_cl *cl = file->private_data;
<------>struct mei_cl_cb *cb;
<------>struct mei_device *dev;
<------>ssize_t rets;
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return -ENODEV;
 
<------>dev = cl->dev;
 
<------>mutex_lock(&dev->device_lock);
 
<------>if (dev->dev_state != MEI_DEV_ENABLED) {
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>if (!mei_cl_is_connected(cl)) {
<------><------>cl_err(dev, cl, "is not connected");
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>if (!mei_me_cl_is_active(cl->me_cl)) {
<------><------>rets = -ENOTTY;
<------><------>goto out;
<------>}
 
<------>if (length > mei_cl_mtu(cl)) {
<------><------>rets = -EFBIG;
<------><------>goto out;
<------>}
 
<------>if (length == 0) {
<------><------>rets = 0;
<------><------>goto out;
<------>}
 
<------>while (cl->tx_cb_queued >= dev->tx_queue_limit) {
<------><------>if (file->f_flags & O_NONBLOCK) {
<------><------><------>rets = -EAGAIN;
<------><------><------>goto out;
<------><------>}
<------><------>mutex_unlock(&dev->device_lock);
<------><------>rets = wait_event_interruptible(cl->tx_wait,
<------><------><------><------>cl->writing_state == MEI_WRITE_COMPLETE ||
<------><------><------><------>(!mei_cl_is_connected(cl)));
<------><------>mutex_lock(&dev->device_lock);
<------><------>if (rets) {
<------><------><------>if (signal_pending(current))
<------><------><------><------>rets = -EINTR;
<------><------><------>goto out;
<------><------>}
<------><------>if (!mei_cl_is_connected(cl)) {
<------><------><------>rets = -ENODEV;
<------><------><------>goto out;
<------><------>}
<------>}
 
<------>cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
<------>if (!cb) {
<------><------>rets = -ENOMEM;
<------><------>goto out;
<------>}
<------>cb->vtag = mei_cl_vtag_by_fp(cl, file);
 
<------>rets = copy_from_user(cb->buf.data, ubuf, length);
<------>if (rets) {
<------><------>dev_dbg(dev->dev, "failed to copy data from userland\n");
<------><------>rets = -EFAULT;
<------><------>mei_io_cb_free(cb);
<------><------>goto out;
<------>}
 
<------>rets = mei_cl_write(cl, cb);
out:
<------>mutex_unlock(&dev->device_lock);
<------>return rets;
}
 
/**
 * mei_ioctl_connect_client - the connect to fw client IOCTL function
 *
 * @file: private data of the file object
 * @in_client_uuid: requested UUID for connection
 * @client: IOCTL connect data, output parameters
 *
 * Locking: called under "dev->device_lock" lock
 *
 * Return: 0 on success, <0 on failure.
 */
static int mei_ioctl_connect_client(struct file *file,
<------><------><------><------>    const uuid_le *in_client_uuid,
<------><------><------><------>    struct mei_client *client)
{
<------>struct mei_device *dev;
<------>struct mei_me_client *me_cl;
<------>struct mei_cl *cl;
<------>int rets;
 
<------>cl = file->private_data;
<------>dev = cl->dev;
 
<------>if (cl->state != MEI_FILE_INITIALIZING &&
<------>    cl->state != MEI_FILE_DISCONNECTED)
<------><------>return  -EBUSY;
 
<------>/* find ME client we're trying to connect to */
<------>me_cl = mei_me_cl_by_uuid(dev, in_client_uuid);
<------>if (!me_cl) {
<------><------>dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
<------><------><------>in_client_uuid);
<------><------>rets = -ENOTTY;
<------><------>goto end;
<------>}
 
<------>if (me_cl->props.fixed_address) {
<------><------>bool forbidden = dev->override_fixed_address ?
<------><------><------> !dev->allow_fixed_address : !dev->hbm_f_fa_supported;
<------><------>if (forbidden) {
<------><------><------>dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n",
<------><------><------><------>in_client_uuid);
<------><------><------>rets = -ENOTTY;
<------><------><------>goto end;
<------><------>}
<------>}
 
<------>dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
<------><------><------>me_cl->client_id);
<------>dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n",
<------><------><------>me_cl->props.protocol_version);
<------>dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n",
<------><------><------>me_cl->props.max_msg_length);
 
<------>/* prepare the output buffer */
<------>client->max_msg_length = me_cl->props.max_msg_length;
<------>client->protocol_version = me_cl->props.protocol_version;
<------>dev_dbg(dev->dev, "Can connect?\n");
 
<------>rets = mei_cl_connect(cl, me_cl, file);
 
end:
<------>mei_me_cl_put(me_cl);
<------>return rets;
}
 
/**
 * mei_vt_support_check - check if client support vtags
 *
 * Locking: called under "dev->device_lock" lock
 *
 * @dev: mei_device
 * @uuid: client UUID
 *
 * Return:
 *	0 - supported
 *	-ENOTTY - no such client
 *	-EOPNOTSUPP - vtags are not supported by client
 */
static int mei_vt_support_check(struct mei_device *dev, const uuid_le *uuid)
{
<------>struct mei_me_client *me_cl;
<------>int ret;
 
<------>if (!dev->hbm_f_vt_supported)
<------><------>return -EOPNOTSUPP;
 
<------>me_cl = mei_me_cl_by_uuid(dev, uuid);
<------>if (!me_cl) {
<------><------>dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
<------><------><------>uuid);
<------><------>return -ENOTTY;
<------>}
<------>ret = me_cl->props.vt_supported ? 0 : -EOPNOTSUPP;
<------>mei_me_cl_put(me_cl);
 
<------>return ret;
}
 
/**
 * mei_ioctl_connect_vtag - connect to fw client with vtag IOCTL function
 *
 * @file: private data of the file object
 * @in_client_uuid: requested UUID for connection
 * @client: IOCTL connect data, output parameters
 * @vtag: vm tag
 *
 * Locking: called under "dev->device_lock" lock
 *
 * Return: 0 on success, <0 on failure.
 */
static int mei_ioctl_connect_vtag(struct file *file,
<------><------><------><------>  const uuid_le *in_client_uuid,
<------><------><------><------>  struct mei_client *client,
<------><------><------><------>  u8 vtag)
{
<------>struct mei_device *dev;
<------>struct mei_cl *cl;
<------>struct mei_cl *pos;
<------>struct mei_cl_vtag *cl_vtag;
 
<------>cl = file->private_data;
<------>dev = cl->dev;
 
<------>dev_dbg(dev->dev, "FW Client %pUl vtag %d\n", in_client_uuid, vtag);
 
<------>switch (cl->state) {
<------>case MEI_FILE_DISCONNECTED:
<------><------>if (mei_cl_vtag_by_fp(cl, file) != vtag) {
<------><------><------>dev_err(dev->dev, "reconnect with different vtag\n");
<------><------><------>return -EINVAL;
<------><------>}
<------><------>break;
<------>case MEI_FILE_INITIALIZING:
<------><------>/* malicious connect from another thread may push vtag */
<------><------>if (!IS_ERR(mei_cl_fp_by_vtag(cl, vtag))) {
<------><------><------>dev_err(dev->dev, "vtag already filled\n");
<------><------><------>return -EINVAL;
<------><------>}
 
<------><------>list_for_each_entry(pos, &dev->file_list, link) {
<------><------><------>if (pos == cl)
<------><------><------><------>continue;
<------><------><------>if (!pos->me_cl)
<------><------><------><------>continue;
 
<------><------><------>/* only search for same UUID */
<------><------><------>if (uuid_le_cmp(*mei_cl_uuid(pos), *in_client_uuid))
<------><------><------><------>continue;
 
<------><------><------>/* if tag already exist try another fp */
<------><------><------>if (!IS_ERR(mei_cl_fp_by_vtag(pos, vtag)))
<------><------><------><------>continue;
 
<------><------><------>/* replace cl with acquired one */
<------><------><------>dev_dbg(dev->dev, "replacing with existing cl\n");
<------><------><------>mei_cl_unlink(cl);
<------><------><------>kfree(cl);
<------><------><------>file->private_data = pos;
<------><------><------>cl = pos;
<------><------><------>break;
<------><------>}
 
<------><------>cl_vtag = mei_cl_vtag_alloc(file, vtag);
<------><------>if (IS_ERR(cl_vtag))
<------><------><------>return -ENOMEM;
 
<------><------>list_add_tail(&cl_vtag->list, &cl->vtag_map);
<------><------>break;
<------>default:
<------><------>return -EBUSY;
<------>}
 
<------>while (cl->state != MEI_FILE_INITIALIZING &&
<------>       cl->state != MEI_FILE_DISCONNECTED &&
<------>       cl->state != MEI_FILE_CONNECTED) {
<------><------>mutex_unlock(&dev->device_lock);
<------><------>wait_event_timeout(cl->wait,
<------><------><------><------>   (cl->state == MEI_FILE_CONNECTED ||
<------><------><------><------>    cl->state == MEI_FILE_DISCONNECTED ||
<------><------><------><------>    cl->state == MEI_FILE_DISCONNECT_REQUIRED ||
<------><------><------><------>    cl->state == MEI_FILE_DISCONNECT_REPLY),
<------><------><------><------>   mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
<------><------>mutex_lock(&dev->device_lock);
<------>}
 
<------>if (!mei_cl_is_connected(cl))
<------><------>return mei_ioctl_connect_client(file, in_client_uuid, client);
 
<------>client->max_msg_length = cl->me_cl->props.max_msg_length;
<------>client->protocol_version = cl->me_cl->props.protocol_version;
 
<------>return 0;
}
 
/**
 * mei_ioctl_client_notify_request -
 *     propagate event notification request to client
 *
 * @file: pointer to file structure
 * @request: 0 - disable, 1 - enable
 *
 * Return: 0 on success , <0 on error
 */
static int mei_ioctl_client_notify_request(const struct file *file, u32 request)
{
<------>struct mei_cl *cl = file->private_data;
 
<------>if (request != MEI_HBM_NOTIFICATION_START &&
<------>    request != MEI_HBM_NOTIFICATION_STOP)
<------><------>return -EINVAL;
 
<------>return mei_cl_notify_request(cl, file, (u8)request);
}
 
/**
 * mei_ioctl_client_notify_get -  wait for notification request
 *
 * @file: pointer to file structure
 * @notify_get: 0 - disable, 1 - enable
 *
 * Return: 0 on success , <0 on error
 */
static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get)
{
<------>struct mei_cl *cl = file->private_data;
<------>bool notify_ev;
<------>bool block = (file->f_flags & O_NONBLOCK) == 0;
<------>int rets;
 
<------>rets = mei_cl_notify_get(cl, block, &notify_ev);
<------>if (rets)
<------><------>return rets;
 
<------>*notify_get = notify_ev ? 1 : 0;
<------>return 0;
}
 
/**
 * mei_ioctl - the IOCTL function
 *
 * @file: pointer to file structure
 * @cmd: ioctl command
 * @data: pointer to mei message structure
 *
 * Return: 0 on success , <0 on error
 */
static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
{
<------>struct mei_device *dev;
<------>struct mei_cl *cl = file->private_data;
<------>struct mei_connect_client_data conn;
<------>struct mei_connect_client_data_vtag conn_vtag;
<------>const uuid_le *cl_uuid;
<------>struct mei_client *props;
<------>u8 vtag;
<------>u32 notify_get, notify_req;
<------>int rets;
 
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return -ENODEV;
 
<------>dev = cl->dev;
 
<------>dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd);
 
<------>mutex_lock(&dev->device_lock);
<------>if (dev->dev_state != MEI_DEV_ENABLED) {
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>switch (cmd) {
<------>case IOCTL_MEI_CONNECT_CLIENT:
<------><------>dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
<------><------>if (copy_from_user(&conn, (char __user *)data, sizeof(conn))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data from userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
<------><------>}
<------><------>cl_uuid = &conn.in_client_uuid;
<------><------>props = &conn.out_client_properties;
<------><------>vtag = 0;
 
<------><------>rets = mei_vt_support_check(dev, cl_uuid);
<------><------>if (rets == -ENOTTY)
<------><------><------>goto out;
<------><------>if (!rets)
<------><------><------>rets = mei_ioctl_connect_vtag(file, cl_uuid, props,
<------><------><------><------><------><------>      vtag);
<------><------>else
<------><------><------>rets = mei_ioctl_connect_client(file, cl_uuid, props);
<------><------>if (rets)
<------><------><------>goto out;
 
<------><------>/* if all is ok, copying the data back to user. */
<------><------>if (copy_to_user((char __user *)data, &conn, sizeof(conn))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data to userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
<------><------>}
 
<------><------>break;
 
<------>case IOCTL_MEI_CONNECT_CLIENT_VTAG:
<------><------>dev_dbg(dev->dev, "IOCTL_MEI_CONNECT_CLIENT_VTAG\n");
<------><------>if (copy_from_user(&conn_vtag, (char __user *)data,
<------><------><------><------>   sizeof(conn_vtag))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data from userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
<------><------>}
 
<------><------>cl_uuid = &conn_vtag.connect.in_client_uuid;
<------><------>props = &conn_vtag.out_client_properties;
<------><------>vtag = conn_vtag.connect.vtag;
 
<------><------>rets = mei_vt_support_check(dev, cl_uuid);
<------><------>if (rets == -EOPNOTSUPP)
<------><------><------>dev_dbg(dev->dev, "FW Client %pUl does not support vtags\n",
<------><------><------><------>cl_uuid);
<------><------>if (rets)
<------><------><------>goto out;
 
<------><------>if (!vtag) {
<------><------><------>dev_dbg(dev->dev, "vtag can't be zero\n");
<------><------><------>rets = -EINVAL;
<------><------><------>goto out;
<------><------>}
 
<------><------>rets = mei_ioctl_connect_vtag(file, cl_uuid, props, vtag);
<------><------>if (rets)
<------><------><------>goto out;
 
<------><------>/* if all is ok, copying the data back to user. */
<------><------>if (copy_to_user((char __user *)data, &conn_vtag,
<------><------><------><------> sizeof(conn_vtag))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data to userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
<------><------>}
 
<------><------>break;
 
<------>case IOCTL_MEI_NOTIFY_SET:
<------><------>dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n");
<------><------>if (copy_from_user(&notify_req,
<------><------><------><------>   (char __user *)data, sizeof(notify_req))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data from userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
<------><------>}
<------><------>rets = mei_ioctl_client_notify_request(file, notify_req);
<------><------>break;
 
<------>case IOCTL_MEI_NOTIFY_GET:
<------><------>dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n");
<------><------>rets = mei_ioctl_client_notify_get(file, &notify_get);
<------><------>if (rets)
<------><------><------>goto out;
 
<------><------>dev_dbg(dev->dev, "copy connect data to user\n");
<------><------>if (copy_to_user((char __user *)data,
<------><------><------><------>&notify_get, sizeof(notify_get))) {
<------><------><------>dev_dbg(dev->dev, "failed to copy data to userland\n");
<------><------><------>rets = -EFAULT;
<------><------><------>goto out;
 
<------><------>}
<------><------>break;
 
<------>default:
<------><------>rets = -ENOIOCTLCMD;
<------>}
 
out:
<------>mutex_unlock(&dev->device_lock);
<------>return rets;
}
 
/**
 * mei_poll - the poll function
 *
 * @file: pointer to file structure
 * @wait: pointer to poll_table structure
 *
 * Return: poll mask
 */
static __poll_t mei_poll(struct file *file, poll_table *wait)
{
<------>__poll_t req_events = poll_requested_events(wait);
<------>struct mei_cl *cl = file->private_data;
<------>struct mei_device *dev;
<------>__poll_t mask = 0;
<------>bool notify_en;
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return EPOLLERR;
 
<------>dev = cl->dev;
 
<------>mutex_lock(&dev->device_lock);
 
<------>notify_en = cl->notify_en && (req_events & EPOLLPRI);
 
<------>if (dev->dev_state != MEI_DEV_ENABLED ||
<------>    !mei_cl_is_connected(cl)) {
<------><------>mask = EPOLLERR;
<------><------>goto out;
<------>}
 
<------>if (notify_en) {
<------><------>poll_wait(file, &cl->ev_wait, wait);
<------><------>if (cl->notify_ev)
<------><------><------>mask |= EPOLLPRI;
<------>}
 
<------>if (req_events & (EPOLLIN | EPOLLRDNORM)) {
<------><------>poll_wait(file, &cl->rx_wait, wait);
 
<------><------>if (mei_cl_read_cb(cl, file))
<------><------><------>mask |= EPOLLIN | EPOLLRDNORM;
<------><------>else
<------><------><------>mei_cl_read_start(cl, mei_cl_mtu(cl), file);
<------>}
 
<------>if (req_events & (EPOLLOUT | EPOLLWRNORM)) {
<------><------>poll_wait(file, &cl->tx_wait, wait);
<------><------>if (cl->tx_cb_queued < dev->tx_queue_limit)
<------><------><------>mask |= EPOLLOUT | EPOLLWRNORM;
<------>}
 
out:
<------>mutex_unlock(&dev->device_lock);
<------>return mask;
}
 
/**
 * mei_cl_is_write_queued - check if the client has pending writes.
 *
 * @cl: writing host client
 *
 * Return: true if client is writing, false otherwise.
 */
static bool mei_cl_is_write_queued(struct mei_cl *cl)
{
<------>struct mei_device *dev = cl->dev;
<------>struct mei_cl_cb *cb;
 
<------>list_for_each_entry(cb, &dev->write_list, list)
<------><------>if (cb->cl == cl)
<------><------><------>return true;
<------>list_for_each_entry(cb, &dev->write_waiting_list, list)
<------><------>if (cb->cl == cl)
<------><------><------>return true;
<------>return false;
}
 
/**
 * mei_fsync - the fsync handler
 *
 * @fp:       pointer to file structure
 * @start:    unused
 * @end:      unused
 * @datasync: unused
 *
 * Return: 0 on success, -ENODEV if client is not connected
 */
static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync)
{
<------>struct mei_cl *cl = fp->private_data;
<------>struct mei_device *dev;
<------>int rets;
 
<------>if (WARN_ON(!cl || !cl->dev))
<------><------>return -ENODEV;
 
<------>dev = cl->dev;
 
<------>mutex_lock(&dev->device_lock);
 
<------>if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) {
<------><------>rets = -ENODEV;
<------><------>goto out;
<------>}
 
<------>while (mei_cl_is_write_queued(cl)) {
<------><------>mutex_unlock(&dev->device_lock);
<------><------>rets = wait_event_interruptible(cl->tx_wait,
<------><------><------><------>cl->writing_state == MEI_WRITE_COMPLETE ||
<------><------><------><------>!mei_cl_is_connected(cl));
<------><------>mutex_lock(&dev->device_lock);
<------><------>if (rets) {
<------><------><------>if (signal_pending(current))
<------><------><------><------>rets = -EINTR;
<------><------><------>goto out;
<------><------>}
<------><------>if (!mei_cl_is_connected(cl)) {
<------><------><------>rets = -ENODEV;
<------><------><------>goto out;
<------><------>}
<------>}
<------>rets = 0;
out:
<------>mutex_unlock(&dev->device_lock);
<------>return rets;
}
 
/**
 * mei_fasync - asynchronous io support
 *
 * @fd: file descriptor
 * @file: pointer to file structure
 * @band: band bitmap
 *
 * Return: negative on error,
 *         0 if it did no changes,
 *         and positive a process was added or deleted
 */
static int mei_fasync(int fd, struct file *file, int band)
{
 
<------>struct mei_cl *cl = file->private_data;
 
<------>if (!mei_cl_is_connected(cl))
<------><------>return -ENODEV;
 
<------>return fasync_helper(fd, file, band, &cl->ev_async);
}
 
/**
 * trc_show - mei device trc attribute show method
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t trc_show(struct device *device,
<------><------><------>struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>u32 trc;
<------>int ret;
 
<------>ret = mei_trc_status(dev, &trc);
<------>if (ret)
<------><------>return ret;
<------>return sprintf(buf, "%08X\n", trc);
}
static DEVICE_ATTR_RO(trc);
 
/**
 * fw_status_show - mei device fw_status attribute show method
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t fw_status_show(struct device *device,
<------><------>struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>struct mei_fw_status fw_status;
<------>int err, i;
<------>ssize_t cnt = 0;
 
<------>mutex_lock(&dev->device_lock);
<------>err = mei_fw_status(dev, &fw_status);
<------>mutex_unlock(&dev->device_lock);
<------>if (err) {
<------><------>dev_err(device, "read fw_status error = %d\n", err);
<------><------>return err;
<------>}
 
<------>for (i = 0; i < fw_status.count; i++)
<------><------>cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n",
<------><------><------><------>fw_status.status[i]);
<------>return cnt;
}
static DEVICE_ATTR_RO(fw_status);
 
/**
 * hbm_ver_show - display HBM protocol version negotiated with FW
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t hbm_ver_show(struct device *device,
<------><------><------>    struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>struct hbm_version ver;
 
<------>mutex_lock(&dev->device_lock);
<------>ver = dev->version;
<------>mutex_unlock(&dev->device_lock);
 
<------>return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version);
}
static DEVICE_ATTR_RO(hbm_ver);
 
/**
 * hbm_ver_drv_show - display HBM protocol version advertised by driver
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t hbm_ver_drv_show(struct device *device,
<------><------><------><------>struct device_attribute *attr, char *buf)
{
<------>return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION);
}
static DEVICE_ATTR_RO(hbm_ver_drv);
 
static ssize_t tx_queue_limit_show(struct device *device,
<------><------><------><------>   struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>u8 size = 0;
 
<------>mutex_lock(&dev->device_lock);
<------>size = dev->tx_queue_limit;
<------>mutex_unlock(&dev->device_lock);
 
<------>return snprintf(buf, PAGE_SIZE, "%u\n", size);
}
 
static ssize_t tx_queue_limit_store(struct device *device,
<------><------><------><------>    struct device_attribute *attr,
<------><------><------><------>    const char *buf, size_t count)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>u8 limit;
<------>unsigned int inp;
<------>int err;
 
<------>err = kstrtouint(buf, 10, &inp);
<------>if (err)
<------><------>return err;
<------>if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN)
<------><------>return -EINVAL;
<------>limit = inp;
 
<------>mutex_lock(&dev->device_lock);
<------>dev->tx_queue_limit = limit;
<------>mutex_unlock(&dev->device_lock);
 
<------>return count;
}
static DEVICE_ATTR_RW(tx_queue_limit);
 
/**
 * fw_ver_show - display ME FW version
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t fw_ver_show(struct device *device,
<------><------><------>   struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>struct mei_fw_version *ver;
<------>ssize_t cnt = 0;
<------>int i;
 
<------>ver = dev->fw_ver;
 
<------>for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++)
<------><------>cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n",
<------><------><------><------> ver[i].platform, ver[i].major, ver[i].minor,
<------><------><------><------> ver[i].hotfix, ver[i].buildno);
<------>return cnt;
}
static DEVICE_ATTR_RO(fw_ver);
 
/**
 * dev_state_show - display device state
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf:  char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t dev_state_show(struct device *device,
<------><------><------>      struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>enum mei_dev_state dev_state;
 
<------>mutex_lock(&dev->device_lock);
<------>dev_state = dev->dev_state;
<------>mutex_unlock(&dev->device_lock);
 
<------>return sprintf(buf, "%s", mei_dev_state_str(dev_state));
}
static DEVICE_ATTR_RO(dev_state);
 
/**
 * dev_set_devstate: set to new device state and notify sysfs file.
 *
 * @dev: mei_device
 * @state: new device state
 */
void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state)
{
<------>struct device *clsdev;
 
<------>if (dev->dev_state == state)
<------><------>return;
 
<------>dev->dev_state = state;
 
<------>clsdev = class_find_device_by_devt(mei_class, dev->cdev.dev);
<------>if (clsdev) {
<------><------>sysfs_notify(&clsdev->kobj, NULL, "dev_state");
<------><------>put_device(clsdev);
<------>}
}
 
/**
 * kind_show - display device kind
 *
 * @device: device pointer
 * @attr: attribute pointer
 * @buf: char out buffer
 *
 * Return: number of the bytes printed into buf or error
 */
static ssize_t kind_show(struct device *device,
<------><------><------> struct device_attribute *attr, char *buf)
{
<------>struct mei_device *dev = dev_get_drvdata(device);
<------>ssize_t ret;
 
<------>if (dev->kind)
<------><------>ret = sprintf(buf, "%s\n", dev->kind);
<------>else
<------><------>ret = sprintf(buf, "%s\n", "mei");
 
<------>return ret;
}
static DEVICE_ATTR_RO(kind);
 
static struct attribute *mei_attrs[] = {
<------>&dev_attr_fw_status.attr,
<------>&dev_attr_hbm_ver.attr,
<------>&dev_attr_hbm_ver_drv.attr,
<------>&dev_attr_tx_queue_limit.attr,
<------>&dev_attr_fw_ver.attr,
<------>&dev_attr_dev_state.attr,
<------>&dev_attr_trc.attr,
<------>&dev_attr_kind.attr,
<------>NULL
};
ATTRIBUTE_GROUPS(mei);
 
/*
 * file operations structure will be used for mei char device.
 */
static const struct file_operations mei_fops = {
<------>.owner = THIS_MODULE,
<------>.read = mei_read,
<------>.unlocked_ioctl = mei_ioctl,
<------>.compat_ioctl = compat_ptr_ioctl,
<------>.open = mei_open,
<------>.release = mei_release,
<------>.write = mei_write,
<------>.poll = mei_poll,
<------>.fsync = mei_fsync,
<------>.fasync = mei_fasync,
<------>.llseek = no_llseek
};
 
/**
 * mei_minor_get - obtain next free device minor number
 *
 * @dev:  device pointer
 *
 * Return: allocated minor, or -ENOSPC if no free minor left
 */
static int mei_minor_get(struct mei_device *dev)
{
<------>int ret;
 
<------>mutex_lock(&mei_minor_lock);
<------>ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL);
<------>if (ret >= 0)
<------><------>dev->minor = ret;
<------>else if (ret == -ENOSPC)
<------><------>dev_err(dev->dev, "too many mei devices\n");
 
<------>mutex_unlock(&mei_minor_lock);
<------>return ret;
}
 
/**
 * mei_minor_free - mark device minor number as free
 *
 * @dev:  device pointer
 */
static void mei_minor_free(struct mei_device *dev)
{
<------>mutex_lock(&mei_minor_lock);
<------>idr_remove(&mei_idr, dev->minor);
<------>mutex_unlock(&mei_minor_lock);
}
 
int mei_register(struct mei_device *dev, struct device *parent)
{
<------>struct device *clsdev; /* class device */
<------>int ret, devno;
 
<------>ret = mei_minor_get(dev);
<------>if (ret < 0)
<------><------>return ret;
 
<------>/* Fill in the data structures */
<------>devno = MKDEV(MAJOR(mei_devt), dev->minor);
<------>cdev_init(&dev->cdev, &mei_fops);
<------>dev->cdev.owner = parent->driver->owner;
 
<------>/* Add the device */
<------>ret = cdev_add(&dev->cdev, devno, 1);
<------>if (ret) {
<------><------>dev_err(parent, "unable to add device %d:%d\n",
<------><------><------>MAJOR(mei_devt), dev->minor);
<------><------>goto err_dev_add;
<------>}
 
<------>clsdev = device_create_with_groups(mei_class, parent, devno,
<------><------><------><------><------>   dev, mei_groups,
<------><------><------><------><------>   "mei%d", dev->minor);
 
<------>if (IS_ERR(clsdev)) {
<------><------>dev_err(parent, "unable to create device %d:%d\n",
<------><------><------>MAJOR(mei_devt), dev->minor);
<------><------>ret = PTR_ERR(clsdev);
<------><------>goto err_dev_create;
<------>}
 
<------>mei_dbgfs_register(dev, dev_name(clsdev));
 
<------>return 0;
 
err_dev_create:
<------>cdev_del(&dev->cdev);
err_dev_add:
<------>mei_minor_free(dev);
<------>return ret;
}
EXPORT_SYMBOL_GPL(mei_register);
 
void mei_deregister(struct mei_device *dev)
{
<------>int devno;
 
<------>devno = dev->cdev.dev;
<------>cdev_del(&dev->cdev);
 
<------>mei_dbgfs_deregister(dev);
 
<------>device_destroy(mei_class, devno);
 
<------>mei_minor_free(dev);
}
EXPORT_SYMBOL_GPL(mei_deregister);
 
static int __init mei_init(void)
{
<------>int ret;
 
<------>mei_class = class_create(THIS_MODULE, "mei");
<------>if (IS_ERR(mei_class)) {
<------><------>pr_err("couldn't create class\n");
<------><------>ret = PTR_ERR(mei_class);
<------><------>goto err;
<------>}
 
<------>ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei");
<------>if (ret < 0) {
<------><------>pr_err("unable to allocate char dev region\n");
<------><------>goto err_class;
<------>}
 
<------>ret = mei_cl_bus_init();
<------>if (ret < 0) {
<------><------>pr_err("unable to initialize bus\n");
<------><------>goto err_chrdev;
<------>}
 
<------>return 0;
 
err_chrdev:
<------>unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
err_class:
<------>class_destroy(mei_class);
err:
<------>return ret;
}
 
static void __exit mei_exit(void)
{
<------>unregister_chrdev_region(mei_devt, MEI_MAX_DEVS);
<------>class_destroy(mei_class);
<------>mei_cl_bus_exit();
}
 
module_init(mei_init);
module_exit(mei_exit);
 
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
MODULE_LICENSE("GPL v2");