forked from Minki/linux
115ba28c5e
Add mei_host_set_ready function to enable the device and is_ready function to query the host and me readiness Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
252 lines
6.6 KiB
C
252 lines
6.6 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 "client.h"
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const char *mei_dev_state_str(int state)
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{
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#define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state
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switch (state) {
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MEI_DEV_STATE(INITIALIZING);
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MEI_DEV_STATE(INIT_CLIENTS);
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MEI_DEV_STATE(ENABLED);
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MEI_DEV_STATE(RESETING);
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MEI_DEV_STATE(DISABLED);
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MEI_DEV_STATE(RECOVERING_FROM_RESET);
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MEI_DEV_STATE(POWER_DOWN);
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MEI_DEV_STATE(POWER_UP);
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default:
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return "unkown";
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}
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#undef MEI_DEV_STATE
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}
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/**
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* init_mei_device - allocates and initializes the mei device structure
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*
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* @pdev: The pci device structure
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*
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* returns The mei_device_device pointer on success, NULL on failure.
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*/
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struct mei_device *mei_device_init(struct pci_dev *pdev)
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{
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struct mei_device *dev;
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dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL);
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if (!dev)
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return NULL;
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/* setup our list array */
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INIT_LIST_HEAD(&dev->file_list);
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INIT_LIST_HEAD(&dev->wd_cl.link);
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INIT_LIST_HEAD(&dev->iamthif_cl.link);
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mutex_init(&dev->device_lock);
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init_waitqueue_head(&dev->wait_recvd_msg);
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init_waitqueue_head(&dev->wait_stop_wd);
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dev->dev_state = MEI_DEV_INITIALIZING;
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mei_io_list_init(&dev->read_list);
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mei_io_list_init(&dev->write_list);
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mei_io_list_init(&dev->write_waiting_list);
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mei_io_list_init(&dev->ctrl_wr_list);
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mei_io_list_init(&dev->ctrl_rd_list);
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mei_io_list_init(&dev->amthif_cmd_list);
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mei_io_list_init(&dev->amthif_rd_complete_list);
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dev->pdev = pdev;
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return dev;
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}
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/**
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* mei_hw_init - initializes host and fw to start work.
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*
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* @dev: the device structure
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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_hw_init(struct mei_device *dev)
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{
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int err = 0;
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int ret;
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mutex_lock(&dev->device_lock);
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dev->host_hw_state = mei_hcsr_read(dev);
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dev->me_hw_state = mei_mecsr_read(dev);
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dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n",
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dev->host_hw_state, dev->me_hw_state);
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/* acknowledge interrupt and stop interupts */
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mei_clear_interrupts(dev);
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/* Doesn't change in runtime */
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dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24;
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dev->recvd_msg = false;
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dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n");
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mei_reset(dev, 1);
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dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
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dev->host_hw_state, dev->me_hw_state);
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/* wait for ME to turn on ME_RDY */
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if (!dev->recvd_msg) {
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mutex_unlock(&dev->device_lock);
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err = wait_event_interruptible_timeout(dev->wait_recvd_msg,
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dev->recvd_msg,
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mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT));
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mutex_lock(&dev->device_lock);
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}
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if (err <= 0 && !dev->recvd_msg) {
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dev->dev_state = MEI_DEV_DISABLED;
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dev_dbg(&dev->pdev->dev,
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"wait_event_interruptible_timeout failed"
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"on wait for ME to turn on ME_RDY.\n");
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ret = -ENODEV;
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goto out;
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}
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if (!(mei_host_is_ready(dev) && mei_me_is_ready(dev))) {
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dev->dev_state = MEI_DEV_DISABLED;
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dev_dbg(&dev->pdev->dev,
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"host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
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dev->host_hw_state, dev->me_hw_state);
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if (!mei_host_is_ready(dev))
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dev_dbg(&dev->pdev->dev, "host is not ready.\n");
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if (!mei_me_is_ready(dev))
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dev_dbg(&dev->pdev->dev, "ME is not ready.\n");
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dev_err(&dev->pdev->dev, "link layer initialization failed.\n");
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ret = -ENODEV;
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goto out;
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}
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if (dev->version.major_version != HBM_MAJOR_VERSION ||
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dev->version.minor_version != HBM_MINOR_VERSION) {
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dev_dbg(&dev->pdev->dev, "MEI start failed.\n");
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ret = -ENODEV;
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goto out;
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}
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dev->recvd_msg = false;
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dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
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dev->host_hw_state, dev->me_hw_state);
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dev_dbg(&dev->pdev->dev, "link layer has been established.\n");
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ret = 0;
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out:
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mutex_unlock(&dev->device_lock);
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return ret;
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}
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/**
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* mei_reset - resets host and fw.
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*
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* @dev: the device structure
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* @interrupts_enabled: if interrupt should be enabled after reset.
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*/
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void mei_reset(struct mei_device *dev, int interrupts_enabled)
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{
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struct mei_cl *cl_pos = NULL;
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struct mei_cl *cl_next = NULL;
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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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bool unexpected;
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if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET)
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return;
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unexpected = (dev->dev_state != MEI_DEV_INITIALIZING &&
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dev->dev_state != MEI_DEV_DISABLED &&
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dev->dev_state != MEI_DEV_POWER_DOWN &&
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dev->dev_state != MEI_DEV_POWER_UP);
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mei_hw_reset(dev, interrupts_enabled);
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if (dev->dev_state != MEI_DEV_INITIALIZING) {
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if (dev->dev_state != MEI_DEV_DISABLED &&
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dev->dev_state != MEI_DEV_POWER_DOWN)
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dev->dev_state = MEI_DEV_RESETING;
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list_for_each_entry_safe(cl_pos,
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cl_next, &dev->file_list, link) {
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cl_pos->state = MEI_FILE_DISCONNECTED;
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cl_pos->mei_flow_ctrl_creds = 0;
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cl_pos->read_cb = NULL;
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cl_pos->timer_count = 0;
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}
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/* remove entry if already in list */
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dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n");
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mei_cl_unlink(&dev->wd_cl);
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if (dev->open_handle_count > 0)
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dev->open_handle_count--;
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mei_cl_unlink(&dev->iamthif_cl);
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if (dev->open_handle_count > 0)
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dev->open_handle_count--;
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mei_amthif_reset_params(dev);
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memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg));
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}
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dev->me_clients_num = 0;
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dev->rd_msg_hdr = 0;
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dev->wd_pending = false;
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/* update the state of the registers after reset */
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dev->host_hw_state = mei_hcsr_read(dev);
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dev->me_hw_state = mei_mecsr_read(dev);
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dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n",
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dev->host_hw_state, dev->me_hw_state);
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if (unexpected)
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dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
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mei_dev_state_str(dev->dev_state));
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/* Wake up all readings so they can be interrupted */
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list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
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if (waitqueue_active(&cl_pos->rx_wait)) {
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dev_dbg(&dev->pdev->dev, "Waking up client!\n");
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wake_up_interruptible(&cl_pos->rx_wait);
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}
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}
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/* remove all waiting requests */
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list_for_each_entry_safe(cb_pos, cb_next, &dev->write_list.list, list) {
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list_del(&cb_pos->list);
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mei_io_cb_free(cb_pos);
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}
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}
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