553 lines
12 KiB
C
553 lines
12 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/kernel.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/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/list.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/uuid.h>
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#include <linux/jiffies.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hbm.h"
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#include "client.h"
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const uuid_le mei_amthif_guid = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,
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0xac, 0xa8, 0x46, 0xe0,
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0xff, 0x65, 0x81, 0x4c);
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/**
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* mei_amthif_reset_params - initializes mei device iamthif
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*
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* @dev: the device structure
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*/
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void mei_amthif_reset_params(struct mei_device *dev)
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{
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/* reset iamthif parameters. */
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dev->iamthif_current_cb = NULL;
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dev->iamthif_canceled = false;
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dev->iamthif_state = MEI_IAMTHIF_IDLE;
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dev->iamthif_stall_timer = 0;
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dev->iamthif_open_count = 0;
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}
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/**
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* mei_amthif_host_init - mei initialization amthif client.
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*
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* @dev: the device structure
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* @me_cl: me client
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_amthif_host_init(struct mei_device *dev, struct mei_me_client *me_cl)
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{
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struct mei_cl *cl = &dev->iamthif_cl;
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int ret;
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if (mei_cl_is_connected(cl))
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return 0;
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dev->iamthif_state = MEI_IAMTHIF_IDLE;
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mei_cl_init(cl, dev);
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ret = mei_cl_link(cl);
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if (ret < 0) {
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dev_err(dev->dev, "amthif: failed cl_link %d\n", ret);
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return ret;
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}
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ret = mei_cl_connect(cl, me_cl, NULL);
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return ret;
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}
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/**
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* mei_amthif_read - read data from AMTHIF client
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*
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* @dev: the device structure
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* @file: pointer to file object
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* @ubuf: pointer to user data in user space
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* @length: data length to read
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* @offset: data read offset
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*
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* Locking: called under "dev->device_lock" lock
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*
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* Return:
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* returned data length on success,
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* zero if no data to read,
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* negative on failure.
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*/
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int mei_amthif_read(struct mei_device *dev, struct file *file,
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char __user *ubuf, 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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int rets;
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int wait_ret;
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dev_dbg(dev->dev, "checking amthif data\n");
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cb = mei_cl_read_cb(cl, file);
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/* Check for if we can block or not*/
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if (cb == NULL && file->f_flags & O_NONBLOCK)
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return -EAGAIN;
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dev_dbg(dev->dev, "waiting for amthif data\n");
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while (cb == NULL) {
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/* unlock the Mutex */
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mutex_unlock(&dev->device_lock);
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wait_ret = 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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/* Locking again the Mutex */
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mutex_lock(&dev->device_lock);
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if (wait_ret)
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return -ERESTARTSYS;
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if (!mei_cl_is_connected(cl)) {
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rets = -EBUSY;
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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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}
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if (cb->status) {
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rets = cb->status;
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dev_dbg(dev->dev, "read operation failed %d\n", rets);
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goto free;
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}
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dev_dbg(dev->dev, "Got amthif data\n");
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/* if the whole message will fit remove it from the list */
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if (cb->buf_idx >= *offset && length >= (cb->buf_idx - *offset))
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list_del_init(&cb->list);
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else if (cb->buf_idx <= *offset) {
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/* end of the message has been reached */
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list_del_init(&cb->list);
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rets = 0;
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goto free;
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}
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/* else means that not full buffer will be read and do not
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* remove message from deletion list
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*/
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dev_dbg(dev->dev, "amthif cb->buf.size - %zu cb->buf_idx - %zu\n",
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cb->buf.size, cb->buf_idx);
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/* length is being truncated to PAGE_SIZE, however,
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* the buf_idx may point beyond */
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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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} else {
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rets = length;
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if ((*offset + length) < cb->buf_idx) {
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*offset += length;
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goto out;
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}
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}
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free:
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dev_dbg(dev->dev, "free amthif cb memory.\n");
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*offset = 0;
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mei_io_cb_free(cb);
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out:
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return rets;
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}
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/**
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* mei_amthif_read_start - queue message for sending read credential
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*
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* @cl: host client
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* @file: file pointer of message recipient
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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_amthif_read_start(struct mei_cl *cl, const struct file *file)
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{
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struct mei_device *dev = cl->dev;
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struct mei_cl_cb *cb;
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int rets;
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cb = mei_io_cb_init(cl, MEI_FOP_READ, file);
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if (!cb) {
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rets = -ENOMEM;
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goto err;
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}
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rets = mei_io_cb_alloc_buf(cb, mei_cl_mtu(cl));
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if (rets)
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goto err;
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list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
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dev->iamthif_state = MEI_IAMTHIF_READING;
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dev->iamthif_fp = cb->fp;
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dev->iamthif_current_cb = cb;
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return 0;
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err:
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mei_io_cb_free(cb);
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return rets;
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}
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/**
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* mei_amthif_send_cmd - send amthif command to the ME
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*
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* @cl: the host client
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* @cb: mei call back struct
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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_amthif_send_cmd(struct mei_cl *cl, struct mei_cl_cb *cb)
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{
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struct mei_device *dev;
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int ret;
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if (!cl->dev || !cb)
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return -ENODEV;
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dev = cl->dev;
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dev->iamthif_state = MEI_IAMTHIF_WRITING;
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dev->iamthif_current_cb = cb;
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dev->iamthif_fp = cb->fp;
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dev->iamthif_canceled = false;
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ret = mei_cl_write(cl, cb, false);
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if (ret < 0)
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return ret;
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if (cb->completed)
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cb->status = mei_amthif_read_start(cl, cb->fp);
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return 0;
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}
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/**
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* mei_amthif_run_next_cmd - send next amt command from queue
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*
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* @dev: the device structure
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_amthif_run_next_cmd(struct mei_device *dev)
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{
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struct mei_cl *cl = &dev->iamthif_cl;
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struct mei_cl_cb *cb;
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dev->iamthif_canceled = false;
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dev->iamthif_state = MEI_IAMTHIF_IDLE;
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dev->iamthif_fp = NULL;
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dev_dbg(dev->dev, "complete amthif cmd_list cb.\n");
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cb = list_first_entry_or_null(&dev->amthif_cmd_list.list,
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typeof(*cb), list);
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if (!cb)
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return 0;
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list_del_init(&cb->list);
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return mei_amthif_send_cmd(cl, cb);
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}
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/**
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* mei_amthif_write - write amthif data to amthif client
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*
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* @cl: host client
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* @cb: mei call back struct
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*
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* Return: 0 on success, <0 on failure.
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*/
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int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb)
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{
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struct mei_device *dev = cl->dev;
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list_add_tail(&cb->list, &dev->amthif_cmd_list.list);
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/*
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* The previous request is still in processing, queue this one.
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*/
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if (dev->iamthif_state > MEI_IAMTHIF_IDLE &&
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dev->iamthif_state < MEI_IAMTHIF_READ_COMPLETE)
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return 0;
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return mei_amthif_run_next_cmd(dev);
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}
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/**
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* mei_amthif_poll - the amthif poll function
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*
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* @dev: the device structure
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* @file: pointer to file structure
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* @wait: pointer to poll_table structure
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*
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* Return: poll mask
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*
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* Locking: called under "dev->device_lock" lock
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*/
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unsigned int mei_amthif_poll(struct mei_device *dev,
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struct file *file, poll_table *wait)
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{
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unsigned int mask = 0;
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poll_wait(file, &dev->iamthif_cl.rx_wait, wait);
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if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
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dev->iamthif_fp == file) {
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mask |= POLLIN | POLLRDNORM;
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mei_amthif_run_next_cmd(dev);
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}
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return mask;
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}
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/**
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* mei_amthif_irq_write - write iamthif command in irq thread context.
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*
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* @cl: private data of the file object.
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* @cb: callback block.
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* @cmpl_list: complete list.
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*
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* Return: 0, OK; otherwise, error.
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*/
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int mei_amthif_irq_write(struct mei_cl *cl, struct mei_cl_cb *cb,
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struct mei_cl_cb *cmpl_list)
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{
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int ret;
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ret = mei_cl_irq_write(cl, cb, cmpl_list);
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if (ret)
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return ret;
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if (cb->completed)
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cb->status = mei_amthif_read_start(cl, cb->fp);
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return 0;
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}
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/**
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* mei_amthif_irq_read_msg - read routine after ISR to
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* handle the read amthif message
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*
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* @cl: mei client
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* @mei_hdr: header of amthif message
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* @cmpl_list: completed callbacks list
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*
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* Return: -ENODEV if cb is NULL 0 otherwise; error message is in cb->status
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*/
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int mei_amthif_irq_read_msg(struct mei_cl *cl,
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struct mei_msg_hdr *mei_hdr,
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struct mei_cl_cb *cmpl_list)
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{
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struct mei_device *dev;
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int ret;
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dev = cl->dev;
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if (dev->iamthif_state != MEI_IAMTHIF_READING) {
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mei_irq_discard_msg(dev, mei_hdr);
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return 0;
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}
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ret = mei_cl_irq_read_msg(cl, mei_hdr, cmpl_list);
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if (ret)
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return ret;
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if (!mei_hdr->msg_complete)
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return 0;
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dev_dbg(dev->dev, "completed amthif read.\n ");
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dev->iamthif_current_cb = NULL;
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dev->iamthif_stall_timer = 0;
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return 0;
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}
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/**
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* mei_amthif_complete - complete amthif callback.
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*
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* @cl: host client
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* @cb: callback block.
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*/
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void mei_amthif_complete(struct mei_cl *cl, struct mei_cl_cb *cb)
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{
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struct mei_device *dev = cl->dev;
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if (cb->fop_type == MEI_FOP_WRITE) {
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if (!cb->status) {
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dev->iamthif_stall_timer = MEI_IAMTHIF_STALL_TIMER;
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mei_io_cb_free(cb);
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return;
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}
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/*
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* in case of error enqueue the write cb to complete read list
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* so it can be propagated to the reader
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*/
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list_add_tail(&cb->list, &cl->rd_completed);
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wake_up_interruptible(&cl->rx_wait);
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return;
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}
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if (!dev->iamthif_canceled) {
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dev->iamthif_state = MEI_IAMTHIF_READ_COMPLETE;
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dev->iamthif_stall_timer = 0;
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list_add_tail(&cb->list, &cl->rd_completed);
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dev_dbg(dev->dev, "amthif read completed\n");
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} else {
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mei_amthif_run_next_cmd(dev);
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}
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dev_dbg(dev->dev, "completing amthif call back.\n");
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wake_up_interruptible(&cl->rx_wait);
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}
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/**
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* mei_clear_list - removes all callbacks associated with file
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* from mei_cb_list
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*
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* @dev: device structure.
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* @file: file structure
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* @mei_cb_list: callbacks list
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*
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* mei_clear_list is called to clear resources associated with file
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* when application calls close function or Ctrl-C was pressed
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*
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* Return: true if callback removed from the list, false otherwise
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*/
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static bool mei_clear_list(struct mei_device *dev,
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const struct file *file, struct list_head *mei_cb_list)
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{
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struct mei_cl *cl = &dev->iamthif_cl;
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struct mei_cl_cb *cb, *next;
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bool removed = false;
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/* list all list member */
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list_for_each_entry_safe(cb, next, mei_cb_list, list) {
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/* check if list member associated with a file */
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if (file == cb->fp) {
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/* check if cb equal to current iamthif cb */
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if (dev->iamthif_current_cb == cb) {
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dev->iamthif_current_cb = NULL;
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/* send flow control to iamthif client */
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mei_hbm_cl_flow_control_req(dev, cl);
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}
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/* free all allocated buffers */
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mei_io_cb_free(cb);
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removed = true;
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}
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}
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return removed;
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}
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/**
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* mei_clear_lists - removes all callbacks associated with file
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*
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* @dev: device structure
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* @file: file structure
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*
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* mei_clear_lists is called to clear resources associated with file
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* when application calls close function or Ctrl-C was pressed
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*
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* Return: true if callback removed from the list, false otherwise
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*/
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static bool mei_clear_lists(struct mei_device *dev, const struct file *file)
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{
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bool removed = false;
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struct mei_cl *cl = &dev->iamthif_cl;
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/* remove callbacks associated with a file */
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mei_clear_list(dev, file, &dev->amthif_cmd_list.list);
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if (mei_clear_list(dev, file, &cl->rd_completed))
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removed = true;
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mei_clear_list(dev, file, &dev->ctrl_rd_list.list);
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if (mei_clear_list(dev, file, &dev->ctrl_wr_list.list))
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removed = true;
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if (mei_clear_list(dev, file, &dev->write_waiting_list.list))
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removed = true;
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if (mei_clear_list(dev, file, &dev->write_list.list))
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removed = true;
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/* check if iamthif_current_cb not NULL */
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if (dev->iamthif_current_cb && !removed) {
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/* check file and iamthif current cb association */
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if (dev->iamthif_current_cb->fp == file) {
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/* remove cb */
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mei_io_cb_free(dev->iamthif_current_cb);
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dev->iamthif_current_cb = NULL;
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removed = true;
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}
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}
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return removed;
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}
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/**
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* mei_amthif_release - the release function
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*
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* @dev: device 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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int mei_amthif_release(struct mei_device *dev, struct file *file)
|
|
{
|
|
if (dev->iamthif_open_count > 0)
|
|
dev->iamthif_open_count--;
|
|
|
|
if (dev->iamthif_fp == file &&
|
|
dev->iamthif_state != MEI_IAMTHIF_IDLE) {
|
|
|
|
dev_dbg(dev->dev, "amthif canceled iamthif state %d\n",
|
|
dev->iamthif_state);
|
|
dev->iamthif_canceled = true;
|
|
if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
|
|
dev_dbg(dev->dev, "run next amthif iamthif cb\n");
|
|
mei_amthif_run_next_cmd(dev);
|
|
}
|
|
}
|
|
|
|
if (mei_clear_lists(dev, file))
|
|
dev->iamthif_state = MEI_IAMTHIF_IDLE;
|
|
|
|
return 0;
|
|
}
|