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1322 lines
28 KiB
1322 lines
28 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
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* Copyright (c) 2003-2020, 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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|
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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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/** |
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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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|
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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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|
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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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cl = mei_cl_alloc_linked(dev); |
|
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_cl_vtag_remove_by_fp - remove vtag that corresponds to fp from list |
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* |
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* @cl: host client |
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* @fp: pointer to file structure |
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* |
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*/ |
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static void mei_cl_vtag_remove_by_fp(const struct mei_cl *cl, |
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const struct file *fp) |
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{ |
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struct mei_cl_vtag *vtag_l, *next; |
|
|
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list_for_each_entry_safe(vtag_l, next, &cl->vtag_map, list) { |
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if (vtag_l->fp == fp) { |
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list_del(&vtag_l->list); |
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kfree(vtag_l); |
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return; |
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} |
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} |
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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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|
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mutex_lock(&dev->device_lock); |
|
|
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mei_cl_vtag_remove_by_fp(cl, file); |
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|
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if (!list_empty(&cl->vtag_map)) { |
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cl_dbg(dev, cl, "not the last vtag\n"); |
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mei_cl_flush_queues(cl, file); |
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rets = 0; |
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goto out; |
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} |
|
|
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rets = mei_cl_disconnect(cl); |
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/* |
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* Check again: This is necessary since disconnect releases the lock |
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* and another client can connect in the meantime. |
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*/ |
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if (!list_empty(&cl->vtag_map)) { |
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cl_dbg(dev, cl, "not the last vtag after disconnect\n"); |
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mei_cl_flush_queues(cl, file); |
|
goto out; |
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} |
|
|
|
mei_cl_flush_queues(cl, NULL); |
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cl_dbg(dev, cl, "removing\n"); |
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|
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mei_cl_unlink(cl); |
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kfree(cl); |
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|
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out: |
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file->private_data = NULL; |
|
|
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mutex_unlock(&dev->device_lock); |
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return rets; |
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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; |
|
goto out; |
|
} |
|
|
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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); |
|
if (cb) |
|
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; |
|
} |
|
|
|
mutex_unlock(&dev->device_lock); |
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if (wait_event_interruptible(cl->rx_wait, |
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mei_cl_read_cb(cl, file) || |
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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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|
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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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} |
|
|
|
copy_buffer: |
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/* now copy the data to user space */ |
|
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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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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} |
|
|
|
/* 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; |
|
goto free; |
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} |
|
|
|
rets = length; |
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*offset += length; |
|
/* not all data was read, keep the cb */ |
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if (*offset < cb->buf_idx) |
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goto out; |
|
|
|
free: |
|
mei_cl_del_rd_completed(cl, cb); |
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*offset = 0; |
|
|
|
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_cl_vtag_by_fp - obtain the vtag by file pointer |
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* |
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* @cl: host client |
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* @fp: pointer to file structure |
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* |
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* Return: vtag value on success, otherwise 0 |
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*/ |
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static u8 mei_cl_vtag_by_fp(const struct mei_cl *cl, const struct file *fp) |
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{ |
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struct mei_cl_vtag *cl_vtag; |
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|
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if (!fp) |
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return 0; |
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list_for_each_entry(cl_vtag, &cl->vtag_map, list) |
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if (cl_vtag->fp == fp) |
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return cl_vtag->vtag; |
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return 0; |
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} |
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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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|
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if (WARN_ON(!cl || !cl->dev)) |
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return -ENODEV; |
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|
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dev = cl->dev; |
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|
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mutex_lock(&dev->device_lock); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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cb->vtag = mei_cl_vtag_by_fp(cl, file); |
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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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* @in_client_uuid: requested UUID for connection |
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* @client: IOCTL connect data, 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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static int mei_ioctl_connect_client(struct file *file, |
|
const uuid_le *in_client_uuid, |
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struct mei_client *client) |
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{ |
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struct mei_device *dev; |
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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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|
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if (cl->state != MEI_FILE_INITIALIZING && |
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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) { |
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dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", |
|
in_client_uuid); |
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rets = -ENOTTY; |
|
goto end; |
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} |
|
|
|
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; |
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} |
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} |
|
|
|
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); |
|
|
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/* prepare the output buffer */ |
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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"); |
|
|
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rets = mei_cl_connect(cl, me_cl, file); |
|
|
|
end: |
|
mei_me_cl_put(me_cl); |
|
return rets; |
|
} |
|
|
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/** |
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* mei_vt_support_check - check if client support vtags |
|
* |
|
* Locking: called under "dev->device_lock" lock |
|
* |
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* @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 |
|
* |
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* 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, ¬ify_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(¬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_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 sysfs_emit(buf, "%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"); |
|
|
|
|