![Tomas Winkler](/assets/img/avatar_default.png)
Since the misc device is registered only in the pci probe function it has to be also unregistered in the counterpart pci remove function and not in the module exit function. In case of probe failure the driver was oopsing in module exit function. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1232 lines
30 KiB
C
1232 lines
30 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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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/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/aio.h>
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#include <linux/pci.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.h>
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#include <linux/uuid.h>
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#include <linux/compat.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/miscdevice.h>
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#include "mei_dev.h"
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#include <linux/mei.h>
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#include "interface.h"
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static const char mei_driver_name[] = "mei";
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/* The device pointer */
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/* Currently this driver works as long as there is only a single AMT device. */
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struct pci_dev *mei_device;
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/* mei_pci_tbl - PCI Device ID Table */
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static DEFINE_PCI_DEVICE_TABLE(mei_pci_tbl) = {
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
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{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
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/* required last entry */
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{0, }
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};
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MODULE_DEVICE_TABLE(pci, mei_pci_tbl);
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static DEFINE_MUTEX(mei_mutex);
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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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* returns 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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struct file *file, struct list_head *mei_cb_list)
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{
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struct mei_cl_cb *cb_pos = NULL;
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struct mei_cl_cb *cb_next = NULL;
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struct file *file_temp;
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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_pos, cb_next, mei_cb_list, cb_list) {
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file_temp = (struct file *)cb_pos->file_object;
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/* check if list member associated with a file */
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if (file_temp == file) {
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/* remove member from the list */
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list_del(&cb_pos->cb_list);
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/* check if cb equal to current iamthif cb */
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if (dev->iamthif_current_cb == cb_pos) {
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dev->iamthif_current_cb = NULL;
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/* send flow control to iamthif client */
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mei_send_flow_control(dev, &dev->iamthif_cl);
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}
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/* free all allocated buffers */
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mei_free_cb_private(cb_pos);
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cb_pos = 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_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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* returns 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, struct file *file)
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{
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bool removed = false;
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/* remove callbacks associated with a file */
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mei_clear_list(dev, file, &dev->amthi_cmd_list.mei_cb.cb_list);
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if (mei_clear_list(dev, file,
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&dev->amthi_read_complete_list.mei_cb.cb_list))
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removed = true;
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mei_clear_list(dev, file, &dev->ctrl_rd_list.mei_cb.cb_list);
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if (mei_clear_list(dev, file, &dev->ctrl_wr_list.mei_cb.cb_list))
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removed = true;
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if (mei_clear_list(dev, file, &dev->write_waiting_list.mei_cb.cb_list))
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removed = true;
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if (mei_clear_list(dev, file, &dev->write_list.mei_cb.cb_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->file_object == file) {
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/* remove cb */
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mei_free_cb_private(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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* find_read_list_entry - find read list entry
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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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* returns cb on success, NULL on error
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*/
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static struct mei_cl_cb *find_read_list_entry(
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struct mei_device *dev,
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struct mei_cl *cl)
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{
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struct mei_cl_cb *pos = NULL;
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struct mei_cl_cb *next = NULL;
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dev_dbg(&dev->pdev->dev, "remove read_list CB\n");
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list_for_each_entry_safe(pos, next,
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&dev->read_list.mei_cb.cb_list, cb_list) {
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struct mei_cl *cl_temp;
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cl_temp = (struct mei_cl *)pos->file_private;
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if (mei_cl_cmp_id(cl, cl_temp))
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return pos;
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}
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return NULL;
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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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* returns 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_cl *cl;
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struct mei_device *dev;
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unsigned long cl_id;
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int err;
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err = -ENODEV;
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if (!mei_device)
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goto out;
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dev = pci_get_drvdata(mei_device);
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if (!dev)
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goto out;
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mutex_lock(&dev->device_lock);
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err = -ENOMEM;
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cl = mei_cl_allocate(dev);
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if (!cl)
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goto out_unlock;
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err = -ENODEV;
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if (dev->mei_state != MEI_ENABLED) {
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dev_dbg(&dev->pdev->dev, "mei_state != MEI_ENABLED mei_state= %d\n",
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dev->mei_state);
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goto out_unlock;
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}
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err = -EMFILE;
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if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT)
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goto out_unlock;
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cl_id = find_first_zero_bit(dev->host_clients_map, MEI_CLIENTS_MAX);
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if (cl_id >= MEI_CLIENTS_MAX)
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goto out_unlock;
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cl->host_client_id = cl_id;
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dev_dbg(&dev->pdev->dev, "client_id = %d\n", cl->host_client_id);
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dev->open_handle_count++;
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list_add_tail(&cl->link, &dev->file_list);
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set_bit(cl->host_client_id, dev->host_clients_map);
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cl->state = MEI_FILE_INITIALIZING;
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cl->sm_state = 0;
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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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out_unlock:
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mutex_unlock(&dev->device_lock);
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kfree(cl);
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out:
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return err;
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}
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/**
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* mei_release - the release function
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*
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* @inode: pointer to inode structure
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* @file: pointer to file structure
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*
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* returns 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_cl_cb *cb;
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struct mei_device *dev;
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int rets = 0;
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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 (cl != &dev->iamthif_cl) {
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if (cl->state == MEI_FILE_CONNECTED) {
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cl->state = MEI_FILE_DISCONNECTING;
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dev_dbg(&dev->pdev->dev,
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"disconnecting client host client = %d, "
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"ME client = %d\n",
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cl->host_client_id,
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cl->me_client_id);
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rets = mei_disconnect_host_client(dev, cl);
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}
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mei_cl_flush_queues(cl);
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dev_dbg(&dev->pdev->dev, "remove client host client = %d, ME client = %d\n",
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cl->host_client_id,
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cl->me_client_id);
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if (dev->open_handle_count > 0) {
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clear_bit(cl->host_client_id, dev->host_clients_map);
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dev->open_handle_count--;
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}
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mei_remove_client_from_file_list(dev, cl->host_client_id);
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/* free read cb */
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cb = NULL;
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if (cl->read_cb) {
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cb = find_read_list_entry(dev, cl);
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/* Remove entry from read list */
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if (cb)
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list_del(&cb->cb_list);
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cb = cl->read_cb;
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cl->read_cb = NULL;
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}
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file->private_data = NULL;
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if (cb) {
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mei_free_cb_private(cb);
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cb = NULL;
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}
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kfree(cl);
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} else {
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if (dev->open_handle_count > 0)
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dev->open_handle_count--;
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if (dev->iamthif_file_object == file &&
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dev->iamthif_state != MEI_IAMTHIF_IDLE) {
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dev_dbg(&dev->pdev->dev, "amthi canceled iamthif state %d\n",
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dev->iamthif_state);
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dev->iamthif_canceled = true;
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if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE) {
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dev_dbg(&dev->pdev->dev, "run next amthi iamthif cb\n");
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mei_run_next_iamthif_cmd(dev);
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}
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}
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if (mei_clear_lists(dev, file))
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dev->iamthif_state = MEI_IAMTHIF_IDLE;
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}
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mutex_unlock(&dev->device_lock);
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return rets;
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}
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/**
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* mei_read - the read function.
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*
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* @file: pointer to file structure
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* @ubuf: pointer to user buffer
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* @length: buffer length
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* @offset: data offset in buffer
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*
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* returns >=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_cl_cb *cb_pos = NULL;
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struct mei_cl_cb *cb = NULL;
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struct mei_device *dev;
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int i;
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int rets;
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int 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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mutex_lock(&dev->device_lock);
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if (dev->mei_state != MEI_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 ((cl->sm_state & MEI_WD_STATE_INDEPENDENCE_MSG_SENT) == 0) {
|
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/* Do not allow to read watchdog client */
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i = mei_find_me_client_index(dev, mei_wd_guid);
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if (i >= 0) {
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struct mei_me_client *me_client = &dev->me_clients[i];
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if (cl->me_client_id == me_client->client_id) {
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rets = -EBADF;
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goto out;
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}
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}
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} else {
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cl->sm_state &= ~MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
|
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}
|
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|
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if (cl == &dev->iamthif_cl) {
|
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rets = amthi_read(dev, file, ubuf, length, offset);
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goto out;
|
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}
|
|
|
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if (cl->read_cb && cl->read_cb->information > *offset) {
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cb = cl->read_cb;
|
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goto copy_buffer;
|
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} else if (cl->read_cb && cl->read_cb->information > 0 &&
|
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cl->read_cb->information <= *offset) {
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cb = cl->read_cb;
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rets = 0;
|
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goto free;
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} else if ((!cl->read_cb || !cl->read_cb->information) &&
|
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*offset > 0) {
|
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/*Offset needs to be cleaned for contiguous reads*/
|
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*offset = 0;
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rets = 0;
|
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goto out;
|
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}
|
|
|
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err = mei_start_read(dev, cl);
|
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if (err && err != -EBUSY) {
|
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dev_dbg(&dev->pdev->dev,
|
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"mei start read failure with status = %d\n", err);
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rets = err;
|
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goto out;
|
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}
|
|
|
|
if (MEI_READ_COMPLETE != cl->reading_state &&
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!waitqueue_active(&cl->rx_wait)) {
|
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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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|
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mutex_unlock(&dev->device_lock);
|
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|
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if (wait_event_interruptible(cl->rx_wait,
|
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(MEI_READ_COMPLETE == cl->reading_state ||
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MEI_FILE_INITIALIZING == cl->state ||
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MEI_FILE_DISCONNECTED == cl->state ||
|
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MEI_FILE_DISCONNECTING == cl->state))) {
|
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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_FILE_INITIALIZING == cl->state ||
|
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MEI_FILE_DISCONNECTED == cl->state ||
|
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MEI_FILE_DISCONNECTING == cl->state) {
|
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rets = -EBUSY;
|
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goto out;
|
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}
|
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}
|
|
|
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cb = cl->read_cb;
|
|
|
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if (!cb) {
|
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rets = -ENODEV;
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goto out;
|
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}
|
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if (cl->reading_state != MEI_READ_COMPLETE) {
|
|
rets = 0;
|
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goto out;
|
|
}
|
|
/* now copy the data to user space */
|
|
copy_buffer:
|
|
dev_dbg(&dev->pdev->dev, "cb->response_buffer size - %d\n",
|
|
cb->response_buffer.size);
|
|
dev_dbg(&dev->pdev->dev, "cb->information - %lu\n",
|
|
cb->information);
|
|
if (length == 0 || ubuf == NULL || *offset > cb->information) {
|
|
rets = -EMSGSIZE;
|
|
goto free;
|
|
}
|
|
|
|
/* length is being truncated to PAGE_SIZE, however, */
|
|
/* information size may be longer */
|
|
length = min_t(size_t, length, (cb->information - *offset));
|
|
|
|
if (copy_to_user(ubuf, cb->response_buffer.data + *offset, length)) {
|
|
rets = -EFAULT;
|
|
goto free;
|
|
}
|
|
|
|
rets = length;
|
|
*offset += length;
|
|
if ((unsigned long)*offset < cb->information)
|
|
goto out;
|
|
|
|
free:
|
|
cb_pos = find_read_list_entry(dev, cl);
|
|
/* Remove entry from read list */
|
|
if (cb_pos)
|
|
list_del(&cb_pos->cb_list);
|
|
mei_free_cb_private(cb);
|
|
cl->reading_state = MEI_IDLE;
|
|
cl->read_cb = NULL;
|
|
cl->read_pending = 0;
|
|
out:
|
|
dev_dbg(&dev->pdev->dev, "end mei read rets= %d\n", rets);
|
|
mutex_unlock(&dev->device_lock);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_write - the write function.
|
|
*
|
|
* @file: pointer to file structure
|
|
* @ubuf: pointer to user buffer
|
|
* @length: buffer length
|
|
* @offset: data offset in buffer
|
|
*
|
|
* returns >=0 data length on success , <0 on error
|
|
*/
|
|
static ssize_t mei_write(struct file *file, const char __user *ubuf,
|
|
size_t length, loff_t *offset)
|
|
{
|
|
struct mei_cl *cl = file->private_data;
|
|
struct mei_cl_cb *write_cb = NULL;
|
|
struct mei_msg_hdr mei_hdr;
|
|
struct mei_device *dev;
|
|
unsigned long timeout = 0;
|
|
int rets;
|
|
int i;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (dev->mei_state != MEI_ENABLED) {
|
|
mutex_unlock(&dev->device_lock);
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (cl == &dev->iamthif_cl) {
|
|
write_cb = find_amthi_read_list_entry(dev, file);
|
|
|
|
if (write_cb) {
|
|
timeout = write_cb->read_time +
|
|
msecs_to_jiffies(IAMTHIF_READ_TIMER);
|
|
|
|
if (time_after(jiffies, timeout) ||
|
|
cl->reading_state == MEI_READ_COMPLETE) {
|
|
*offset = 0;
|
|
list_del(&write_cb->cb_list);
|
|
mei_free_cb_private(write_cb);
|
|
write_cb = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* free entry used in read */
|
|
if (cl->reading_state == MEI_READ_COMPLETE) {
|
|
*offset = 0;
|
|
write_cb = find_read_list_entry(dev, cl);
|
|
if (write_cb) {
|
|
list_del(&write_cb->cb_list);
|
|
mei_free_cb_private(write_cb);
|
|
write_cb = NULL;
|
|
cl->reading_state = MEI_IDLE;
|
|
cl->read_cb = NULL;
|
|
cl->read_pending = 0;
|
|
}
|
|
} else if (cl->reading_state == MEI_IDLE && !cl->read_pending)
|
|
*offset = 0;
|
|
|
|
|
|
write_cb = kzalloc(sizeof(struct mei_cl_cb), GFP_KERNEL);
|
|
if (!write_cb) {
|
|
mutex_unlock(&dev->device_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
write_cb->file_object = file;
|
|
write_cb->file_private = cl;
|
|
write_cb->request_buffer.data = kmalloc(length, GFP_KERNEL);
|
|
rets = -ENOMEM;
|
|
if (!write_cb->request_buffer.data)
|
|
goto unlock_dev;
|
|
|
|
dev_dbg(&dev->pdev->dev, "length =%d\n", (int) length);
|
|
|
|
rets = -EFAULT;
|
|
if (copy_from_user(write_cb->request_buffer.data, ubuf, length))
|
|
goto unlock_dev;
|
|
|
|
cl->sm_state = 0;
|
|
if (length == 4 &&
|
|
((memcmp(mei_wd_state_independence_msg[0],
|
|
write_cb->request_buffer.data, 4) == 0) ||
|
|
(memcmp(mei_wd_state_independence_msg[1],
|
|
write_cb->request_buffer.data, 4) == 0) ||
|
|
(memcmp(mei_wd_state_independence_msg[2],
|
|
write_cb->request_buffer.data, 4) == 0)))
|
|
cl->sm_state |= MEI_WD_STATE_INDEPENDENCE_MSG_SENT;
|
|
|
|
INIT_LIST_HEAD(&write_cb->cb_list);
|
|
if (cl == &dev->iamthif_cl) {
|
|
write_cb->response_buffer.data =
|
|
kmalloc(dev->iamthif_mtu, GFP_KERNEL);
|
|
if (!write_cb->response_buffer.data) {
|
|
rets = -ENOMEM;
|
|
goto unlock_dev;
|
|
}
|
|
if (dev->mei_state != MEI_ENABLED) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
for (i = 0; i < dev->me_clients_num; i++) {
|
|
if (dev->me_clients[i].client_id ==
|
|
dev->iamthif_cl.me_client_id)
|
|
break;
|
|
}
|
|
|
|
if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
if (i == dev->me_clients_num ||
|
|
(dev->me_clients[i].client_id !=
|
|
dev->iamthif_cl.me_client_id)) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
} else if (length > dev->me_clients[i].props.max_msg_length ||
|
|
length <= 0) {
|
|
rets = -EMSGSIZE;
|
|
goto unlock_dev;
|
|
}
|
|
|
|
write_cb->response_buffer.size = dev->iamthif_mtu;
|
|
write_cb->major_file_operations = MEI_IOCTL;
|
|
write_cb->information = 0;
|
|
write_cb->request_buffer.size = length;
|
|
if (dev->iamthif_cl.state != MEI_FILE_CONNECTED) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
|
|
if (!list_empty(&dev->amthi_cmd_list.mei_cb.cb_list) ||
|
|
dev->iamthif_state != MEI_IAMTHIF_IDLE) {
|
|
dev_dbg(&dev->pdev->dev, "amthi_state = %d\n",
|
|
(int) dev->iamthif_state);
|
|
dev_dbg(&dev->pdev->dev, "add amthi cb to amthi cmd waiting list\n");
|
|
list_add_tail(&write_cb->cb_list,
|
|
&dev->amthi_cmd_list.mei_cb.cb_list);
|
|
rets = length;
|
|
} else {
|
|
dev_dbg(&dev->pdev->dev, "call amthi write\n");
|
|
rets = amthi_write(dev, write_cb);
|
|
|
|
if (rets) {
|
|
dev_dbg(&dev->pdev->dev, "amthi write failed with status = %d\n",
|
|
rets);
|
|
goto unlock_dev;
|
|
}
|
|
rets = length;
|
|
}
|
|
mutex_unlock(&dev->device_lock);
|
|
return rets;
|
|
}
|
|
|
|
write_cb->major_file_operations = MEI_WRITE;
|
|
/* make sure information is zero before we start */
|
|
|
|
write_cb->information = 0;
|
|
write_cb->request_buffer.size = length;
|
|
|
|
dev_dbg(&dev->pdev->dev, "host client = %d, ME client = %d\n",
|
|
cl->host_client_id, cl->me_client_id);
|
|
if (cl->state != MEI_FILE_CONNECTED) {
|
|
rets = -ENODEV;
|
|
dev_dbg(&dev->pdev->dev, "host client = %d, is not connected to ME client = %d",
|
|
cl->host_client_id,
|
|
cl->me_client_id);
|
|
goto unlock_dev;
|
|
}
|
|
for (i = 0; i < dev->me_clients_num; i++) {
|
|
if (dev->me_clients[i].client_id ==
|
|
cl->me_client_id)
|
|
break;
|
|
}
|
|
if (WARN_ON(dev->me_clients[i].client_id != cl->me_client_id)) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
if (i == dev->me_clients_num) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
if (length > dev->me_clients[i].props.max_msg_length || length <= 0) {
|
|
rets = -EINVAL;
|
|
goto unlock_dev;
|
|
}
|
|
write_cb->file_private = cl;
|
|
|
|
rets = mei_flow_ctrl_creds(dev, cl);
|
|
if (rets < 0)
|
|
goto unlock_dev;
|
|
|
|
if (rets && dev->mei_host_buffer_is_empty) {
|
|
rets = 0;
|
|
dev->mei_host_buffer_is_empty = false;
|
|
if (length > ((((dev->host_hw_state & H_CBD) >> 24) *
|
|
sizeof(u32)) - sizeof(struct mei_msg_hdr))) {
|
|
|
|
mei_hdr.length =
|
|
(((dev->host_hw_state & H_CBD) >> 24) *
|
|
sizeof(u32)) -
|
|
sizeof(struct mei_msg_hdr);
|
|
mei_hdr.msg_complete = 0;
|
|
} else {
|
|
mei_hdr.length = length;
|
|
mei_hdr.msg_complete = 1;
|
|
}
|
|
mei_hdr.host_addr = cl->host_client_id;
|
|
mei_hdr.me_addr = cl->me_client_id;
|
|
mei_hdr.reserved = 0;
|
|
dev_dbg(&dev->pdev->dev, "call mei_write_message header=%08x.\n",
|
|
*((u32 *) &mei_hdr));
|
|
if (mei_write_message(dev, &mei_hdr,
|
|
(unsigned char *) (write_cb->request_buffer.data),
|
|
mei_hdr.length)) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
cl->writing_state = MEI_WRITING;
|
|
write_cb->information = mei_hdr.length;
|
|
if (mei_hdr.msg_complete) {
|
|
if (mei_flow_ctrl_reduce(dev, cl)) {
|
|
rets = -ENODEV;
|
|
goto unlock_dev;
|
|
}
|
|
list_add_tail(&write_cb->cb_list,
|
|
&dev->write_waiting_list.mei_cb.cb_list);
|
|
} else {
|
|
list_add_tail(&write_cb->cb_list,
|
|
&dev->write_list.mei_cb.cb_list);
|
|
}
|
|
|
|
} else {
|
|
|
|
write_cb->information = 0;
|
|
cl->writing_state = MEI_WRITING;
|
|
list_add_tail(&write_cb->cb_list,
|
|
&dev->write_list.mei_cb.cb_list);
|
|
}
|
|
mutex_unlock(&dev->device_lock);
|
|
return length;
|
|
|
|
unlock_dev:
|
|
mutex_unlock(&dev->device_lock);
|
|
mei_free_cb_private(write_cb);
|
|
return rets;
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_ioctl - the IOCTL function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @cmd: ioctl command
|
|
* @data: pointer to mei message structure
|
|
*
|
|
* returns 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 *connect_data = NULL;
|
|
int rets;
|
|
|
|
if (cmd != IOCTL_MEI_CONNECT_CLIENT)
|
|
return -EINVAL;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return -ENODEV;
|
|
|
|
dev = cl->dev;
|
|
|
|
dev_dbg(&dev->pdev->dev, "IOCTL cmd = 0x%x", cmd);
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
if (dev->mei_state != MEI_ENABLED) {
|
|
rets = -ENODEV;
|
|
goto out;
|
|
}
|
|
|
|
dev_dbg(&dev->pdev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n");
|
|
|
|
connect_data = kzalloc(sizeof(struct mei_connect_client_data),
|
|
GFP_KERNEL);
|
|
if (!connect_data) {
|
|
rets = -ENOMEM;
|
|
goto out;
|
|
}
|
|
dev_dbg(&dev->pdev->dev, "copy connect data from user\n");
|
|
if (copy_from_user(connect_data, (char __user *)data,
|
|
sizeof(struct mei_connect_client_data))) {
|
|
dev_dbg(&dev->pdev->dev, "failed to copy data from userland\n");
|
|
rets = -EFAULT;
|
|
goto out;
|
|
}
|
|
rets = mei_ioctl_connect_client(file, connect_data);
|
|
|
|
/* if all is ok, copying the data back to user. */
|
|
if (rets)
|
|
goto out;
|
|
|
|
dev_dbg(&dev->pdev->dev, "copy connect data to user\n");
|
|
if (copy_to_user((char __user *)data, connect_data,
|
|
sizeof(struct mei_connect_client_data))) {
|
|
dev_dbg(&dev->pdev->dev, "failed to copy data to userland\n");
|
|
rets = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
kfree(connect_data);
|
|
mutex_unlock(&dev->device_lock);
|
|
return rets;
|
|
}
|
|
|
|
/**
|
|
* mei_compat_ioctl - the compat IOCTL function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @cmd: ioctl command
|
|
* @data: pointer to mei message structure
|
|
*
|
|
* returns 0 on success , <0 on error
|
|
*/
|
|
#ifdef CONFIG_COMPAT
|
|
static long mei_compat_ioctl(struct file *file,
|
|
unsigned int cmd, unsigned long data)
|
|
{
|
|
return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data));
|
|
}
|
|
#endif
|
|
|
|
|
|
/**
|
|
* mei_poll - the poll function
|
|
*
|
|
* @file: pointer to file structure
|
|
* @wait: pointer to poll_table structure
|
|
*
|
|
* returns poll mask
|
|
*/
|
|
static unsigned int mei_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct mei_cl *cl = file->private_data;
|
|
struct mei_device *dev;
|
|
unsigned int mask = 0;
|
|
|
|
if (WARN_ON(!cl || !cl->dev))
|
|
return mask;
|
|
|
|
dev = cl->dev;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
if (dev->mei_state != MEI_ENABLED)
|
|
goto out;
|
|
|
|
|
|
if (cl == &dev->iamthif_cl) {
|
|
mutex_unlock(&dev->device_lock);
|
|
poll_wait(file, &dev->iamthif_cl.wait, wait);
|
|
mutex_lock(&dev->device_lock);
|
|
if (dev->iamthif_state == MEI_IAMTHIF_READ_COMPLETE &&
|
|
dev->iamthif_file_object == file) {
|
|
mask |= (POLLIN | POLLRDNORM);
|
|
dev_dbg(&dev->pdev->dev, "run next amthi cb\n");
|
|
mei_run_next_iamthif_cmd(dev);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
poll_wait(file, &cl->tx_wait, wait);
|
|
mutex_lock(&dev->device_lock);
|
|
if (MEI_WRITE_COMPLETE == cl->writing_state)
|
|
mask |= (POLLIN | POLLRDNORM);
|
|
|
|
out:
|
|
mutex_unlock(&dev->device_lock);
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* file operations structure will be used for mei char device.
|
|
*/
|
|
static const struct file_operations mei_fops = {
|
|
.owner = THIS_MODULE,
|
|
.read = mei_read,
|
|
.unlocked_ioctl = mei_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mei_compat_ioctl,
|
|
#endif
|
|
.open = mei_open,
|
|
.release = mei_release,
|
|
.write = mei_write,
|
|
.poll = mei_poll,
|
|
.llseek = no_llseek
|
|
};
|
|
|
|
|
|
/*
|
|
* Misc Device Struct
|
|
*/
|
|
static struct miscdevice mei_misc_device = {
|
|
.name = "mei",
|
|
.fops = &mei_fops,
|
|
.minor = MISC_DYNAMIC_MINOR,
|
|
};
|
|
|
|
/**
|
|
* mei_probe - Device Initialization Routine
|
|
*
|
|
* @pdev: PCI device structure
|
|
* @ent: entry in kcs_pci_tbl
|
|
*
|
|
* returns 0 on success, <0 on failure.
|
|
*/
|
|
static int __devinit mei_probe(struct pci_dev *pdev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
struct mei_device *dev;
|
|
int err;
|
|
|
|
mutex_lock(&mei_mutex);
|
|
if (mei_device) {
|
|
err = -EEXIST;
|
|
goto end;
|
|
}
|
|
/* enable pci dev */
|
|
err = pci_enable_device(pdev);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to enable pci device.\n");
|
|
goto end;
|
|
}
|
|
/* set PCI host mastering */
|
|
pci_set_master(pdev);
|
|
/* pci request regions for mei driver */
|
|
err = pci_request_regions(pdev, mei_driver_name);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "failed to get pci regions.\n");
|
|
goto disable_device;
|
|
}
|
|
/* allocates and initializes the mei dev structure */
|
|
dev = mei_device_init(pdev);
|
|
if (!dev) {
|
|
err = -ENOMEM;
|
|
goto release_regions;
|
|
}
|
|
/* mapping IO device memory */
|
|
dev->mem_addr = pci_iomap(pdev, 0, 0);
|
|
if (!dev->mem_addr) {
|
|
dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
|
|
err = -ENOMEM;
|
|
goto free_device;
|
|
}
|
|
pci_enable_msi(pdev);
|
|
|
|
/* request and enable interrupt */
|
|
if (pci_dev_msi_enabled(pdev))
|
|
err = request_threaded_irq(pdev->irq,
|
|
NULL,
|
|
mei_interrupt_thread_handler,
|
|
IRQF_ONESHOT, mei_driver_name, dev);
|
|
else
|
|
err = request_threaded_irq(pdev->irq,
|
|
mei_interrupt_quick_handler,
|
|
mei_interrupt_thread_handler,
|
|
IRQF_SHARED, mei_driver_name, dev);
|
|
|
|
if (err) {
|
|
dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
|
|
pdev->irq);
|
|
goto unmap_memory;
|
|
}
|
|
INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
|
|
if (mei_hw_init(dev)) {
|
|
dev_err(&pdev->dev, "init hw failure.\n");
|
|
err = -ENODEV;
|
|
goto release_irq;
|
|
}
|
|
|
|
err = misc_register(&mei_misc_device);
|
|
if (err)
|
|
goto release_irq;
|
|
|
|
mei_device = pdev;
|
|
pci_set_drvdata(pdev, dev);
|
|
|
|
|
|
schedule_delayed_work(&dev->timer_work, HZ);
|
|
|
|
mutex_unlock(&mei_mutex);
|
|
|
|
pr_debug("initialization successful.\n");
|
|
|
|
return 0;
|
|
|
|
release_irq:
|
|
/* disable interrupts */
|
|
dev->host_hw_state = mei_hcsr_read(dev);
|
|
mei_disable_interrupts(dev);
|
|
flush_scheduled_work();
|
|
free_irq(pdev->irq, dev);
|
|
pci_disable_msi(pdev);
|
|
unmap_memory:
|
|
pci_iounmap(pdev, dev->mem_addr);
|
|
free_device:
|
|
kfree(dev);
|
|
release_regions:
|
|
pci_release_regions(pdev);
|
|
disable_device:
|
|
pci_disable_device(pdev);
|
|
end:
|
|
mutex_unlock(&mei_mutex);
|
|
dev_err(&pdev->dev, "initialization failed.\n");
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* mei_remove - Device Removal Routine
|
|
*
|
|
* @pdev: PCI device structure
|
|
*
|
|
* mei_remove is called by the PCI subsystem to alert the driver
|
|
* that it should release a PCI device.
|
|
*/
|
|
static void __devexit mei_remove(struct pci_dev *pdev)
|
|
{
|
|
struct mei_device *dev;
|
|
|
|
if (mei_device != pdev)
|
|
return;
|
|
|
|
dev = pci_get_drvdata(pdev);
|
|
if (!dev)
|
|
return;
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
|
|
mei_wd_stop(dev, false);
|
|
|
|
mei_device = NULL;
|
|
|
|
if (dev->iamthif_cl.state == MEI_FILE_CONNECTED) {
|
|
dev->iamthif_cl.state = MEI_FILE_DISCONNECTING;
|
|
mei_disconnect_host_client(dev, &dev->iamthif_cl);
|
|
}
|
|
if (dev->wd_cl.state == MEI_FILE_CONNECTED) {
|
|
dev->wd_cl.state = MEI_FILE_DISCONNECTING;
|
|
mei_disconnect_host_client(dev, &dev->wd_cl);
|
|
}
|
|
|
|
/* Unregistering watchdog device */
|
|
mei_watchdog_unregister(dev);
|
|
|
|
/* remove entry if already in list */
|
|
dev_dbg(&pdev->dev, "list del iamthif and wd file list.\n");
|
|
mei_remove_client_from_file_list(dev, dev->wd_cl.host_client_id);
|
|
mei_remove_client_from_file_list(dev, dev->iamthif_cl.host_client_id);
|
|
|
|
dev->iamthif_current_cb = NULL;
|
|
dev->me_clients_num = 0;
|
|
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
flush_scheduled_work();
|
|
|
|
/* disable interrupts */
|
|
mei_disable_interrupts(dev);
|
|
|
|
free_irq(pdev->irq, dev);
|
|
pci_disable_msi(pdev);
|
|
pci_set_drvdata(pdev, NULL);
|
|
|
|
if (dev->mem_addr)
|
|
pci_iounmap(pdev, dev->mem_addr);
|
|
|
|
kfree(dev);
|
|
|
|
pci_release_regions(pdev);
|
|
pci_disable_device(pdev);
|
|
|
|
misc_deregister(&mei_misc_device);
|
|
}
|
|
#ifdef CONFIG_PM
|
|
static int mei_pci_suspend(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct mei_device *dev = pci_get_drvdata(pdev);
|
|
int err;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
mutex_lock(&dev->device_lock);
|
|
/* Stop watchdog if exists */
|
|
err = mei_wd_stop(dev, true);
|
|
/* Set new mei state */
|
|
if (dev->mei_state == MEI_ENABLED ||
|
|
dev->mei_state == MEI_RECOVERING_FROM_RESET) {
|
|
dev->mei_state = MEI_POWER_DOWN;
|
|
mei_reset(dev, 0);
|
|
}
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
free_irq(pdev->irq, dev);
|
|
pci_disable_msi(pdev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int mei_pci_resume(struct device *device)
|
|
{
|
|
struct pci_dev *pdev = to_pci_dev(device);
|
|
struct mei_device *dev;
|
|
int err;
|
|
|
|
dev = pci_get_drvdata(pdev);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
pci_enable_msi(pdev);
|
|
|
|
/* request and enable interrupt */
|
|
if (pci_dev_msi_enabled(pdev))
|
|
err = request_threaded_irq(pdev->irq,
|
|
NULL,
|
|
mei_interrupt_thread_handler,
|
|
0, mei_driver_name, dev);
|
|
else
|
|
err = request_threaded_irq(pdev->irq,
|
|
mei_interrupt_quick_handler,
|
|
mei_interrupt_thread_handler,
|
|
IRQF_SHARED, mei_driver_name, dev);
|
|
|
|
if (err) {
|
|
dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
|
|
pdev->irq);
|
|
return err;
|
|
}
|
|
|
|
mutex_lock(&dev->device_lock);
|
|
dev->mei_state = MEI_POWER_UP;
|
|
mei_reset(dev, 1);
|
|
mutex_unlock(&dev->device_lock);
|
|
|
|
/* Start timer if stopped in suspend */
|
|
schedule_delayed_work(&dev->timer_work, HZ);
|
|
|
|
return err;
|
|
}
|
|
static SIMPLE_DEV_PM_OPS(mei_pm_ops, mei_pci_suspend, mei_pci_resume);
|
|
#define MEI_PM_OPS (&mei_pm_ops)
|
|
#else
|
|
#define MEI_PM_OPS NULL
|
|
#endif /* CONFIG_PM */
|
|
/*
|
|
* PCI driver structure
|
|
*/
|
|
static struct pci_driver mei_driver = {
|
|
.name = mei_driver_name,
|
|
.id_table = mei_pci_tbl,
|
|
.probe = mei_probe,
|
|
.remove = __devexit_p(mei_remove),
|
|
.shutdown = __devexit_p(mei_remove),
|
|
.driver.pm = MEI_PM_OPS,
|
|
};
|
|
|
|
/**
|
|
* mei_init_module - Driver Registration Routine
|
|
*
|
|
* mei_init_module is the first routine called when the driver is
|
|
* loaded. All it does is to register with the PCI subsystem.
|
|
*
|
|
* returns 0 on success, <0 on failure.
|
|
*/
|
|
static int __init mei_init_module(void)
|
|
{
|
|
int ret;
|
|
|
|
pr_debug("loading.\n");
|
|
/* init pci module */
|
|
ret = pci_register_driver(&mei_driver);
|
|
if (ret < 0)
|
|
pr_err("error registering driver.\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
module_init(mei_init_module);
|
|
|
|
/**
|
|
* mei_exit_module - Driver Exit Cleanup Routine
|
|
*
|
|
* mei_exit_module is called just before the driver is removed
|
|
* from memory.
|
|
*/
|
|
static void __exit mei_exit_module(void)
|
|
{
|
|
pci_unregister_driver(&mei_driver);
|
|
|
|
pr_debug("unloaded successfully.\n");
|
|
}
|
|
|
|
module_exit(mei_exit_module);
|
|
|
|
|
|
MODULE_AUTHOR("Intel Corporation");
|
|
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
|
|
MODULE_LICENSE("GPL v2");
|