730 lines
15 KiB
C
730 lines
15 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/pci.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/delay.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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/**
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* mei_me_cl_by_uuid - locate index of me client
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*
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* @dev: mei device
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* returns me client index or -ENOENT if not found
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*/
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int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *uuid)
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{
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int i, res = -ENOENT;
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for (i = 0; i < dev->me_clients_num; ++i)
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if (uuid_le_cmp(*uuid,
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dev->me_clients[i].props.protocol_name) == 0) {
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res = i;
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break;
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}
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return res;
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}
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/**
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* mei_me_cl_by_id return index to me_clients for client_id
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*
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* @dev: the device structure
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* @client_id: me client id
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*
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* Locking: called under "dev->device_lock" lock
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*
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* returns index on success, -ENOENT on failure.
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*/
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int mei_me_cl_by_id(struct mei_device *dev, u8 client_id)
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{
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int i;
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for (i = 0; i < dev->me_clients_num; i++)
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if (dev->me_clients[i].client_id == client_id)
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break;
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if (WARN_ON(dev->me_clients[i].client_id != client_id))
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return -ENOENT;
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if (i == dev->me_clients_num)
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return -ENOENT;
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return i;
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}
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/**
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* mei_io_list_flush - removes list entry belonging to cl.
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*
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* @list: An instance of our list structure
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* @cl: host client
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*/
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void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl)
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{
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struct mei_cl_cb *cb;
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struct mei_cl_cb *next;
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list_for_each_entry_safe(cb, next, &list->list, list) {
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if (cb->cl && mei_cl_cmp_id(cl, cb->cl))
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list_del(&cb->list);
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}
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}
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/**
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* mei_io_cb_free - free mei_cb_private related memory
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*
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* @cb: mei callback struct
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*/
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void mei_io_cb_free(struct mei_cl_cb *cb)
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{
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if (cb == NULL)
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return;
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kfree(cb->request_buffer.data);
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kfree(cb->response_buffer.data);
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kfree(cb);
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}
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/**
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* mei_io_cb_init - allocate and initialize io callback
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*
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* @cl - mei client
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* @file: pointer to file structure
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*
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* returns mei_cl_cb pointer or NULL;
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*/
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struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp)
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{
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struct mei_cl_cb *cb;
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cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
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if (!cb)
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return NULL;
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mei_io_list_init(cb);
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cb->file_object = fp;
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cb->cl = cl;
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cb->buf_idx = 0;
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return cb;
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}
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/**
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* mei_io_cb_alloc_req_buf - allocate request buffer
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*
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* @cb - io callback structure
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* @size: size of the buffer
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*
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* returns 0 on success
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* -EINVAL if cb is NULL
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* -ENOMEM if allocation failed
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*/
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int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length)
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{
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if (!cb)
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return -EINVAL;
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if (length == 0)
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return 0;
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cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
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if (!cb->request_buffer.data)
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return -ENOMEM;
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cb->request_buffer.size = length;
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return 0;
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}
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/**
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* mei_io_cb_alloc_req_buf - allocate respose buffer
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*
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* @cb - io callback structure
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* @size: size of the buffer
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*
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* returns 0 on success
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* -EINVAL if cb is NULL
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* -ENOMEM if allocation failed
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*/
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int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length)
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{
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if (!cb)
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return -EINVAL;
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if (length == 0)
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return 0;
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cb->response_buffer.data = kmalloc(length, GFP_KERNEL);
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if (!cb->response_buffer.data)
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return -ENOMEM;
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cb->response_buffer.size = length;
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return 0;
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}
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/**
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* mei_cl_flush_queues - flushes queue lists belonging to cl.
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*
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* @dev: the device structure
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* @cl: host client
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*/
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int mei_cl_flush_queues(struct mei_cl *cl)
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{
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if (WARN_ON(!cl || !cl->dev))
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return -EINVAL;
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dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n");
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mei_io_list_flush(&cl->dev->read_list, cl);
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mei_io_list_flush(&cl->dev->write_list, cl);
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mei_io_list_flush(&cl->dev->write_waiting_list, cl);
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mei_io_list_flush(&cl->dev->ctrl_wr_list, cl);
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mei_io_list_flush(&cl->dev->ctrl_rd_list, cl);
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mei_io_list_flush(&cl->dev->amthif_cmd_list, cl);
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mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl);
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return 0;
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}
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/**
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* mei_cl_init - initializes intialize cl.
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*
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* @cl: host client to be initialized
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* @dev: mei device
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*/
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void mei_cl_init(struct mei_cl *cl, struct mei_device *dev)
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{
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memset(cl, 0, sizeof(struct mei_cl));
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init_waitqueue_head(&cl->wait);
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init_waitqueue_head(&cl->rx_wait);
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init_waitqueue_head(&cl->tx_wait);
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INIT_LIST_HEAD(&cl->link);
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cl->reading_state = MEI_IDLE;
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cl->writing_state = MEI_IDLE;
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cl->dev = dev;
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}
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/**
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* mei_cl_allocate - allocates cl structure and sets it up.
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*
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* @dev: mei device
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* returns The allocated file or NULL on failure
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*/
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struct mei_cl *mei_cl_allocate(struct mei_device *dev)
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{
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struct mei_cl *cl;
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cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL);
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if (!cl)
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return NULL;
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mei_cl_init(cl, dev);
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return cl;
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}
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/**
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* mei_cl_find_read_cb - find this cl's callback in the read list
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*
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* @dev: device structure
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* returns cb on success, NULL on error
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*/
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struct mei_cl_cb *mei_cl_find_read_cb(struct mei_cl *cl)
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{
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struct mei_device *dev = cl->dev;
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struct mei_cl_cb *cb = NULL;
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struct mei_cl_cb *next = NULL;
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list_for_each_entry_safe(cb, next, &dev->read_list.list, list)
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if (mei_cl_cmp_id(cl, cb->cl))
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return cb;
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return NULL;
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}
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/** mei_cl_link: allocte host id in the host map
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*
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* @cl - host client
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* @id - fixed host id or -1 for genereting one
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* returns 0 on success
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* -EINVAL on incorrect values
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* -ENONET if client not found
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*/
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int mei_cl_link(struct mei_cl *cl, int id)
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{
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struct mei_device *dev;
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if (WARN_ON(!cl || !cl->dev))
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return -EINVAL;
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dev = cl->dev;
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/* If Id is not asigned get one*/
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if (id == MEI_HOST_CLIENT_ID_ANY)
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id = find_first_zero_bit(dev->host_clients_map,
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MEI_CLIENTS_MAX);
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if (id >= MEI_CLIENTS_MAX) {
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dev_err(&dev->pdev->dev, "id exceded %d", MEI_CLIENTS_MAX) ;
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return -ENOENT;
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}
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dev->open_handle_count++;
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cl->host_client_id = id;
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list_add_tail(&cl->link, &dev->file_list);
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set_bit(id, dev->host_clients_map);
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cl->state = MEI_FILE_INITIALIZING;
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dev_dbg(&dev->pdev->dev, "link cl host id = %d\n", cl->host_client_id);
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return 0;
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}
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/**
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* mei_cl_unlink - remove me_cl from the list
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*
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* @dev: the device structure
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*/
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int mei_cl_unlink(struct mei_cl *cl)
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{
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struct mei_device *dev;
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struct mei_cl *pos, *next;
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/* don't shout on error exit path */
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if (!cl)
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return 0;
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/* wd and amthif might not be initialized */
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if (!cl->dev)
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return 0;
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dev = cl->dev;
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list_for_each_entry_safe(pos, next, &dev->file_list, link) {
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if (cl->host_client_id == pos->host_client_id) {
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dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n",
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pos->host_client_id, pos->me_client_id);
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list_del_init(&pos->link);
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break;
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}
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}
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return 0;
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}
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void mei_host_client_init(struct work_struct *work)
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{
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struct mei_device *dev = container_of(work,
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struct mei_device, init_work);
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struct mei_client_properties *client_props;
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int i;
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mutex_lock(&dev->device_lock);
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bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX);
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dev->open_handle_count = 0;
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/*
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* Reserving the first three client IDs
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* 0: Reserved for MEI Bus Message communications
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* 1: Reserved for Watchdog
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* 2: Reserved for AMTHI
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*/
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bitmap_set(dev->host_clients_map, 0, 3);
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for (i = 0; i < dev->me_clients_num; i++) {
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client_props = &dev->me_clients[i].props;
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if (!uuid_le_cmp(client_props->protocol_name, mei_amthif_guid))
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mei_amthif_host_init(dev);
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else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid))
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mei_wd_host_init(dev);
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}
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dev->dev_state = MEI_DEV_ENABLED;
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mutex_unlock(&dev->device_lock);
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}
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/**
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* mei_cl_disconnect - disconnect host clinet form the me one
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*
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* @cl: host client
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*
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* Locking: called under "dev->device_lock" lock
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*
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* returns 0 on success, <0 on failure.
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*/
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int mei_cl_disconnect(struct mei_cl *cl)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb;
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int rets, err;
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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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if (cl->state != MEI_FILE_DISCONNECTING)
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return 0;
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cb = mei_io_cb_init(cl, NULL);
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if (!cb)
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return -ENOMEM;
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cb->fop_type = MEI_FOP_CLOSE;
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if (dev->hbuf_is_ready) {
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dev->hbuf_is_ready = false;
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if (mei_hbm_cl_disconnect_req(dev, cl)) {
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rets = -ENODEV;
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dev_err(&dev->pdev->dev, "failed to disconnect.\n");
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goto free;
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}
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mdelay(10); /* Wait for hardware disconnection ready */
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list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
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} else {
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dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n");
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list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
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}
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mutex_unlock(&dev->device_lock);
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err = wait_event_timeout(dev->wait_recvd_msg,
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MEI_FILE_DISCONNECTED == cl->state,
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mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT));
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mutex_lock(&dev->device_lock);
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if (MEI_FILE_DISCONNECTED == cl->state) {
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rets = 0;
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dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n");
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} else {
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rets = -ENODEV;
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if (MEI_FILE_DISCONNECTED != cl->state)
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dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n");
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if (err)
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dev_dbg(&dev->pdev->dev,
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"wait failed disconnect err=%08x\n",
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err);
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dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n");
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}
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mei_io_list_flush(&dev->ctrl_rd_list, cl);
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mei_io_list_flush(&dev->ctrl_wr_list, cl);
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free:
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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_cl_is_other_connecting - checks if other
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* client with the same me client id is connecting
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*
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* @cl: private data of the file object
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*
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* returns ture if other client is connected, 0 - otherwise.
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*/
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bool mei_cl_is_other_connecting(struct mei_cl *cl)
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{
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struct mei_device *dev;
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struct mei_cl *pos;
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struct mei_cl *next;
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if (WARN_ON(!cl || !cl->dev))
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return false;
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dev = cl->dev;
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list_for_each_entry_safe(pos, next, &dev->file_list, link) {
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if ((pos->state == MEI_FILE_CONNECTING) &&
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(pos != cl) && cl->me_client_id == pos->me_client_id)
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return true;
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}
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return false;
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}
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/**
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* mei_cl_connect - connect host clinet to the me one
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*
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* @cl: host client
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*
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* Locking: called under "dev->device_lock" lock
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*
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* returns 0 on success, <0 on failure.
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*/
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int mei_cl_connect(struct mei_cl *cl, struct file *file)
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{
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struct mei_device *dev;
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struct mei_cl_cb *cb;
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long timeout = mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT);
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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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cb = mei_io_cb_init(cl, 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->fop_type = MEI_FOP_IOCTL;
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if (dev->hbuf_is_ready && !mei_cl_is_other_connecting(cl)) {
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dev->hbuf_is_ready = false;
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if (mei_hbm_cl_connect_req(dev, cl)) {
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rets = -ENODEV;
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goto out;
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}
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cl->timer_count = MEI_CONNECT_TIMEOUT;
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list_add_tail(&cb->list, &dev->ctrl_rd_list.list);
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} else {
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list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
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}
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mutex_unlock(&dev->device_lock);
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rets = wait_event_timeout(dev->wait_recvd_msg,
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(cl->state == MEI_FILE_CONNECTED ||
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cl->state == MEI_FILE_DISCONNECTED),
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timeout * HZ);
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mutex_lock(&dev->device_lock);
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if (cl->state != MEI_FILE_CONNECTED) {
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rets = -EFAULT;
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mei_io_list_flush(&dev->ctrl_rd_list, cl);
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mei_io_list_flush(&dev->ctrl_wr_list, cl);
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goto out;
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}
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rets = cl->status;
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out:
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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_cl_flow_ctrl_creds - checks flow_control credits for cl.
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*
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* @dev: the device structure
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* @cl: private data of the file object
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*
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* returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
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* -ENOENT if mei_cl is not present
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* -EINVAL if single_recv_buf == 0
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*/
|
|
int mei_cl_flow_ctrl_creds(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
int i;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -EINVAL;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!dev->me_clients_num)
|
|
return 0;
|
|
|
|
if (cl->mei_flow_ctrl_creds > 0)
|
|
return 1;
|
|
|
|
for (i = 0; i < dev->me_clients_num; i++) {
|
|
struct mei_me_client *me_cl = &dev->me_clients[i];
|
|
if (me_cl->client_id == cl->me_client_id) {
|
|
if (me_cl->mei_flow_ctrl_creds) {
|
|
if (WARN_ON(me_cl->props.single_recv_buf == 0))
|
|
return -EINVAL;
|
|
return 1;
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_flow_ctrl_reduce - reduces flow_control.
|
|
*
|
|
* @dev: the device structure
|
|
* @cl: private data of the file object
|
|
* @returns
|
|
* 0 on success
|
|
* -ENOENT when me client is not found
|
|
* -EINVAL when ctrl credits are <= 0
|
|
*/
|
|
int mei_cl_flow_ctrl_reduce(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
int i;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -EINVAL;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (!dev->me_clients_num)
|
|
return -ENOENT;
|
|
|
|
for (i = 0; i < dev->me_clients_num; i++) {
|
|
struct mei_me_client *me_cl = &dev->me_clients[i];
|
|
if (me_cl->client_id == cl->me_client_id) {
|
|
if (me_cl->props.single_recv_buf != 0) {
|
|
if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
|
|
return -EINVAL;
|
|
dev->me_clients[i].mei_flow_ctrl_creds--;
|
|
} else {
|
|
if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
|
|
return -EINVAL;
|
|
cl->mei_flow_ctrl_creds--;
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENOENT;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_start_read - the start read client message function.
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* returns 0 on success, <0 on failure.
|
|
*/
|
|
int mei_cl_read_start(struct mei_cl *cl)
|
|
{
|
|
struct mei_device *dev;
|
|
struct mei_cl_cb *cb;
|
|
int rets;
|
|
int i;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
if (cl->state != MEI_FILE_CONNECTED)
|
|
return -ENODEV;
|
|
|
|
if (dev->dev_state != MEI_DEV_ENABLED)
|
|
return -ENODEV;
|
|
|
|
if (cl->read_cb) {
|
|
dev_dbg(&dev->pdev->dev, "read is pending.\n");
|
|
return -EBUSY;
|
|
}
|
|
i = mei_me_cl_by_id(dev, cl->me_client_id);
|
|
if (i < 0) {
|
|
dev_err(&dev->pdev->dev, "no such me client %d\n",
|
|
cl->me_client_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
cb = mei_io_cb_init(cl, NULL);
|
|
if (!cb)
|
|
return -ENOMEM;
|
|
|
|
rets = mei_io_cb_alloc_resp_buf(cb,
|
|
dev->me_clients[i].props.max_msg_length);
|
|
if (rets)
|
|
goto err;
|
|
|
|
cb->fop_type = MEI_FOP_READ;
|
|
cl->read_cb = cb;
|
|
if (dev->hbuf_is_ready) {
|
|
dev->hbuf_is_ready = false;
|
|
if (mei_hbm_cl_flow_control_req(dev, cl)) {
|
|
rets = -ENODEV;
|
|
goto err;
|
|
}
|
|
list_add_tail(&cb->list, &dev->read_list.list);
|
|
} else {
|
|
list_add_tail(&cb->list, &dev->ctrl_wr_list.list);
|
|
}
|
|
return rets;
|
|
err:
|
|
mei_io_cb_free(cb);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_all_disconnect - disconnect forcefully all connected clients
|
|
*
|
|
* @dev - mei device
|
|
*/
|
|
|
|
void mei_cl_all_disconnect(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl, *next;
|
|
|
|
list_for_each_entry_safe(cl, next, &dev->file_list, link) {
|
|
cl->state = MEI_FILE_DISCONNECTED;
|
|
cl->mei_flow_ctrl_creds = 0;
|
|
cl->read_cb = NULL;
|
|
cl->timer_count = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_all_read_wakeup - wake up all readings so they can be interrupted
|
|
*
|
|
* @dev - mei device
|
|
*/
|
|
void mei_cl_all_read_wakeup(struct mei_device *dev)
|
|
{
|
|
struct mei_cl *cl, *next;
|
|
list_for_each_entry_safe(cl, next, &dev->file_list, link) {
|
|
if (waitqueue_active(&cl->rx_wait)) {
|
|
dev_dbg(&dev->pdev->dev, "Waking up client!\n");
|
|
wake_up_interruptible(&cl->rx_wait);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mei_cl_all_write_clear - clear all pending writes
|
|
|
|
* @dev - mei device
|
|
*/
|
|
void mei_cl_all_write_clear(struct mei_device *dev)
|
|
{
|
|
struct mei_cl_cb *cb, *next;
|
|
|
|
list_for_each_entry_safe(cb, next, &dev->write_list.list, list) {
|
|
list_del(&cb->list);
|
|
mei_io_cb_free(cb);
|
|
}
|
|
}
|
|
|
|
|