1054 lines
22 KiB
C
1054 lines
22 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2003-2018, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/poll.h>
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#include <linux/init.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/sched/signal.h>
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#include <linux/uuid.h>
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#include <linux/compat.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "client.h"
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static struct class *mei_class;
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static dev_t mei_devt;
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#define MEI_MAX_DEVS MINORMASK
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static DEFINE_MUTEX(mei_minor_lock);
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static DEFINE_IDR(mei_idr);
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/**
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* mei_open - the open function
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*
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* @inode: pointer to inode structure
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* @file: pointer to file structure
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*
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* Return: 0 on success, <0 on error
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*/
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static int mei_open(struct inode *inode, struct file *file)
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{
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struct mei_device *dev;
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struct mei_cl *cl;
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int err;
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dev = container_of(inode->i_cdev, struct mei_device, cdev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n",
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mei_dev_state_str(dev->dev_state));
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err = -ENODEV;
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goto err_unlock;
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}
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cl = mei_cl_alloc_linked(dev);
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if (IS_ERR(cl)) {
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err = PTR_ERR(cl);
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goto err_unlock;
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}
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cl->fp = file;
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file->private_data = cl;
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mutex_unlock(&dev->device_lock);
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return nonseekable_open(inode, file);
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err_unlock:
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mutex_unlock(&dev->device_lock);
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return err;
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}
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/**
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* mei_release - the release function
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*
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* @inode: pointer to inode structure
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* @file: pointer to file structure
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*
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* Return: 0 on success, <0 on error
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*/
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static int mei_release(struct inode *inode, struct file *file)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_device *dev;
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int rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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rets = mei_cl_disconnect(cl);
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mei_cl_flush_queues(cl, file);
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cl_dbg(dev, cl, "removing\n");
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mei_cl_unlink(cl);
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file->private_data = NULL;
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kfree(cl);
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_read - the read function.
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*
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* @file: pointer to file structure
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* @ubuf: pointer to user buffer
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* @length: buffer length
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* @offset: data offset in buffer
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*
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* Return: >=0 data length on success , <0 on error
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*/
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static ssize_t mei_read(struct file *file, char __user *ubuf,
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size_t length, loff_t *offset)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_device *dev;
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struct mei_cl_cb *cb = NULL;
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bool nonblock = !!(file->f_flags & O_NONBLOCK);
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ssize_t rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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if (length == 0) {
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rets = 0;
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goto out;
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}
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if (ubuf == NULL) {
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rets = -EMSGSIZE;
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goto out;
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}
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cb = mei_cl_read_cb(cl, file);
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if (cb)
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goto copy_buffer;
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if (*offset > 0)
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*offset = 0;
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rets = mei_cl_read_start(cl, length, file);
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if (rets && rets != -EBUSY) {
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cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets);
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goto out;
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}
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if (nonblock) {
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rets = -EAGAIN;
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goto out;
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}
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mutex_unlock(&dev->device_lock);
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if (wait_event_interruptible(cl->rx_wait,
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!list_empty(&cl->rd_completed) ||
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!mei_cl_is_connected(cl))) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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mutex_lock(&dev->device_lock);
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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cb = mei_cl_read_cb(cl, file);
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if (!cb) {
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rets = 0;
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goto out;
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}
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copy_buffer:
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/* now copy the data to user space */
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if (cb->status) {
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rets = cb->status;
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cl_dbg(dev, cl, "read operation failed %zd\n", rets);
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goto free;
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}
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cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n",
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cb->buf.size, cb->buf_idx, *offset);
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if (*offset >= cb->buf_idx) {
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rets = 0;
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goto free;
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}
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/* length is being truncated to PAGE_SIZE,
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* however buf_idx may point beyond that */
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length = min_t(size_t, length, cb->buf_idx - *offset);
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if (copy_to_user(ubuf, cb->buf.data + *offset, length)) {
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dev_dbg(dev->dev, "failed to copy data to userland\n");
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rets = -EFAULT;
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goto free;
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}
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rets = length;
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*offset += length;
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/* not all data was read, keep the cb */
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if (*offset < cb->buf_idx)
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goto out;
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free:
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mei_io_cb_free(cb);
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*offset = 0;
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out:
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cl_dbg(dev, cl, "end mei read rets = %zd\n", rets);
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_write - the write function.
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*
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* @file: pointer to file structure
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* @ubuf: pointer to user buffer
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* @length: buffer length
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* @offset: data offset in buffer
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*
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* Return: >=0 data length on success , <0 on error
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*/
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static ssize_t mei_write(struct file *file, const char __user *ubuf,
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size_t length, loff_t *offset)
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{
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struct mei_cl *cl = file->private_data;
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struct mei_cl_cb *cb;
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struct mei_device *dev;
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ssize_t rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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if (!mei_cl_is_connected(cl)) {
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cl_err(dev, cl, "is not connected");
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rets = -ENODEV;
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goto out;
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}
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if (!mei_me_cl_is_active(cl->me_cl)) {
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rets = -ENOTTY;
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goto out;
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}
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if (length > mei_cl_mtu(cl)) {
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rets = -EFBIG;
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goto out;
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}
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if (length == 0) {
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rets = 0;
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goto out;
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}
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while (cl->tx_cb_queued >= dev->tx_queue_limit) {
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if (file->f_flags & O_NONBLOCK) {
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rets = -EAGAIN;
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goto out;
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}
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mutex_unlock(&dev->device_lock);
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rets = wait_event_interruptible(cl->tx_wait,
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cl->writing_state == MEI_WRITE_COMPLETE ||
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(!mei_cl_is_connected(cl)));
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mutex_lock(&dev->device_lock);
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if (rets) {
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if (signal_pending(current))
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rets = -EINTR;
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goto out;
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}
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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}
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cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file);
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if (!cb) {
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rets = -ENOMEM;
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goto out;
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}
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rets = copy_from_user(cb->buf.data, ubuf, length);
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if (rets) {
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dev_dbg(dev->dev, "failed to copy data from userland\n");
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rets = -EFAULT;
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mei_io_cb_free(cb);
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goto out;
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}
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rets = mei_cl_write(cl, cb);
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out:
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_ioctl_connect_client - the connect to fw client IOCTL function
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*
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* @file: private data of the file object
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* @data: IOCTL connect data, input and output parameters
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*
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* Locking: called under "dev->device_lock" lock
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*
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* Return: 0 on success, <0 on failure.
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*/
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static int mei_ioctl_connect_client(struct file *file,
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struct mei_connect_client_data *data)
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{
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struct mei_device *dev;
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struct mei_client *client;
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struct mei_me_client *me_cl;
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struct mei_cl *cl;
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int rets;
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cl = file->private_data;
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dev = cl->dev;
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if (dev->dev_state != MEI_DEV_ENABLED)
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return -ENODEV;
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if (cl->state != MEI_FILE_INITIALIZING &&
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cl->state != MEI_FILE_DISCONNECTED)
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return -EBUSY;
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/* find ME client we're trying to connect to */
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me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
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if (!me_cl) {
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dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n",
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&data->in_client_uuid);
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rets = -ENOTTY;
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goto end;
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}
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if (me_cl->props.fixed_address) {
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bool forbidden = dev->override_fixed_address ?
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!dev->allow_fixed_address : !dev->hbm_f_fa_supported;
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if (forbidden) {
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dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n",
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&data->in_client_uuid);
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rets = -ENOTTY;
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goto end;
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}
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}
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dev_dbg(dev->dev, "Connect to FW Client ID = %d\n",
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me_cl->client_id);
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dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n",
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me_cl->props.protocol_version);
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dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n",
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me_cl->props.max_msg_length);
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/* prepare the output buffer */
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client = &data->out_client_properties;
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client->max_msg_length = me_cl->props.max_msg_length;
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client->protocol_version = me_cl->props.protocol_version;
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dev_dbg(dev->dev, "Can connect?\n");
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rets = mei_cl_connect(cl, me_cl, file);
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end:
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mei_me_cl_put(me_cl);
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return rets;
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}
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/**
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* mei_ioctl_client_notify_request -
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* propagate event notification request to client
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*
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* @file: pointer to file structure
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* @request: 0 - disable, 1 - enable
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*
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* Return: 0 on success , <0 on error
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*/
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static int mei_ioctl_client_notify_request(const struct file *file, u32 request)
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{
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struct mei_cl *cl = file->private_data;
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if (request != MEI_HBM_NOTIFICATION_START &&
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request != MEI_HBM_NOTIFICATION_STOP)
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return -EINVAL;
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return mei_cl_notify_request(cl, file, (u8)request);
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}
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/**
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* mei_ioctl_client_notify_get - wait for notification request
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*
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* @file: pointer to file structure
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* @notify_get: 0 - disable, 1 - enable
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*
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* Return: 0 on success , <0 on error
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*/
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static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get)
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{
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struct mei_cl *cl = file->private_data;
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bool notify_ev;
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bool block = (file->f_flags & O_NONBLOCK) == 0;
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int rets;
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rets = mei_cl_notify_get(cl, block, ¬ify_ev);
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if (rets)
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return rets;
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*notify_get = notify_ev ? 1 : 0;
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return 0;
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}
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/**
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* mei_ioctl - the IOCTL function
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*
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* @file: pointer to file structure
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* @cmd: ioctl command
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* @data: pointer to mei message structure
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*
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* Return: 0 on success , <0 on error
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*/
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static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data)
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{
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struct mei_device *dev;
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struct mei_cl *cl = file->private_data;
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struct mei_connect_client_data connect_data;
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u32 notify_get, notify_req;
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int rets;
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|
|
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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dev = cl->dev;
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dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd);
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mutex_lock(&dev->device_lock);
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if (dev->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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switch (cmd) {
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case IOCTL_MEI_CONNECT_CLIENT:
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dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
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if (copy_from_user(&connect_data, (char __user *)data,
|
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sizeof(struct mei_connect_client_data))) {
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|
dev_dbg(dev->dev, "failed to copy data from userland\n");
|
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rets = -EFAULT;
|
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goto out;
|
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}
|
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|
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rets = mei_ioctl_connect_client(file, &connect_data);
|
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if (rets)
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goto out;
|
|
|
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/* if all is ok, copying the data back to user. */
|
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if (copy_to_user((char __user *)data, &connect_data,
|
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sizeof(struct mei_connect_client_data))) {
|
|
dev_dbg(dev->dev, "failed to copy data to userland\n");
|
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rets = -EFAULT;
|
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goto out;
|
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}
|
|
|
|
break;
|
|
|
|
case IOCTL_MEI_NOTIFY_SET:
|
|
dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n");
|
|
if (copy_from_user(¬ify_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, ¬ify_get);
|
|
if (rets)
|
|
goto out;
|
|
|
|
dev_dbg(dev->dev, "copy connect data to user\n");
|
|
if (copy_to_user((char __user *)data,
|
|
¬ify_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_compat_ioctl - the compat IOCTL function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @cmd: ioctl command
|
|
* @data: pointer to mei message structure
|
|
*
|
|
* Return: 0 on success , <0 on error
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
static long mei_compat_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long data)
|
|
{
|
|
return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
|
|
}
|
|
#endif
|
|
|
|
|
|
/**
|
|
* 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 (!list_empty(&cl->rd_completed))
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
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,
|
|
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,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mei_compat_ioctl,
|
|
#endif
|
|
.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");
|
|
|