401 lines
9.1 KiB
C
401 lines
9.1 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/export.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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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(RESETTING);
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MEI_DEV_STATE(DISABLED);
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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 "unknown";
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}
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#undef MEI_DEV_STATE
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}
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const char *mei_pg_state_str(enum mei_pg_state state)
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{
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#define MEI_PG_STATE(state) case MEI_PG_##state: return #state
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switch (state) {
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MEI_PG_STATE(OFF);
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MEI_PG_STATE(ON);
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default:
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return "unknown";
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}
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#undef MEI_PG_STATE
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}
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/**
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* mei_cancel_work - Cancel mei background jobs
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*
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* @dev: the device structure
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*/
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void mei_cancel_work(struct mei_device *dev)
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{
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cancel_work_sync(&dev->init_work);
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cancel_work_sync(&dev->reset_work);
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cancel_delayed_work(&dev->timer_work);
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}
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EXPORT_SYMBOL_GPL(mei_cancel_work);
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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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*
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* Return: 0 on success or < 0 if the reset hasn't succeeded
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*/
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int mei_reset(struct mei_device *dev)
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{
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enum mei_dev_state state = dev->dev_state;
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bool interrupts_enabled;
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int ret;
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if (state != MEI_DEV_INITIALIZING &&
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state != MEI_DEV_DISABLED &&
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state != MEI_DEV_POWER_DOWN &&
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state != MEI_DEV_POWER_UP) {
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struct mei_fw_status fw_status;
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mei_fw_status(dev, &fw_status);
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dev_warn(dev->dev,
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"unexpected reset: dev_state = %s " FW_STS_FMT "\n",
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mei_dev_state_str(state), FW_STS_PRM(fw_status));
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}
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/* we're already in reset, cancel the init timer
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* if the reset was called due the hbm protocol error
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* we need to call it before hw start
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* so the hbm watchdog won't kick in
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*/
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mei_hbm_idle(dev);
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/* enter reset flow */
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interrupts_enabled = state != MEI_DEV_POWER_DOWN;
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dev->dev_state = MEI_DEV_RESETTING;
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dev->reset_count++;
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if (dev->reset_count > MEI_MAX_CONSEC_RESET) {
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dev_err(dev->dev, "reset: reached maximal consecutive resets: disabling the device\n");
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dev->dev_state = MEI_DEV_DISABLED;
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return -ENODEV;
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}
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ret = mei_hw_reset(dev, interrupts_enabled);
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/* fall through and remove the sw state even if hw reset has failed */
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/* no need to clean up software state in case of power up */
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if (state != MEI_DEV_INITIALIZING &&
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state != MEI_DEV_POWER_UP) {
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/* remove all waiting requests */
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mei_cl_all_write_clear(dev);
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mei_cl_all_disconnect(dev);
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/* wake up all readers and writers so they can be interrupted */
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mei_cl_all_wakeup(dev);
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/* remove entry if already in list */
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dev_dbg(dev->dev, "remove iamthif and wd from the file list.\n");
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mei_cl_unlink(&dev->wd_cl);
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mei_cl_unlink(&dev->iamthif_cl);
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mei_amthif_reset_params(dev);
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}
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mei_hbm_reset(dev);
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dev->rd_msg_hdr = 0;
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dev->wd_pending = false;
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if (ret) {
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dev_err(dev->dev, "hw_reset failed ret = %d\n", ret);
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return ret;
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}
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if (state == MEI_DEV_POWER_DOWN) {
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dev_dbg(dev->dev, "powering down: end of reset\n");
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dev->dev_state = MEI_DEV_DISABLED;
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return 0;
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}
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ret = mei_hw_start(dev);
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if (ret) {
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dev_err(dev->dev, "hw_start failed ret = %d\n", ret);
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return ret;
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}
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dev_dbg(dev->dev, "link is established start sending messages.\n");
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dev->dev_state = MEI_DEV_INIT_CLIENTS;
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ret = mei_hbm_start_req(dev);
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if (ret) {
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dev_err(dev->dev, "hbm_start failed ret = %d\n", ret);
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dev->dev_state = MEI_DEV_RESETTING;
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_reset);
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/**
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* mei_start - 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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* Return: 0 on success, <0 on failure.
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*/
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int mei_start(struct mei_device *dev)
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{
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int ret;
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mutex_lock(&dev->device_lock);
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/* acknowledge interrupt and stop interrupts */
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mei_clear_interrupts(dev);
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mei_hw_config(dev);
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dev_dbg(dev->dev, "reset in start the mei device.\n");
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dev->reset_count = 0;
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do {
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dev->dev_state = MEI_DEV_INITIALIZING;
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ret = mei_reset(dev);
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if (ret == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
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dev_err(dev->dev, "reset failed ret = %d", ret);
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goto err;
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}
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} while (ret);
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/* we cannot start the device w/o hbm start message completed */
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if (dev->dev_state == MEI_DEV_DISABLED) {
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dev_err(dev->dev, "reset failed");
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goto err;
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}
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if (mei_hbm_start_wait(dev)) {
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dev_err(dev->dev, "HBM haven't started");
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goto err;
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}
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if (!mei_host_is_ready(dev)) {
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dev_err(dev->dev, "host is not ready.\n");
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goto err;
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}
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if (!mei_hw_is_ready(dev)) {
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dev_err(dev->dev, "ME is not ready.\n");
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goto err;
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}
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if (!mei_hbm_version_is_supported(dev)) {
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dev_dbg(dev->dev, "MEI start failed.\n");
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goto err;
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}
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dev_dbg(dev->dev, "link layer has been established.\n");
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mutex_unlock(&dev->device_lock);
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return 0;
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err:
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dev_err(dev->dev, "link layer initialization failed.\n");
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dev->dev_state = MEI_DEV_DISABLED;
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mutex_unlock(&dev->device_lock);
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return -ENODEV;
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}
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EXPORT_SYMBOL_GPL(mei_start);
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/**
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* mei_restart - restart device after suspend
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*
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* @dev: the device structure
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*
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* Return: 0 on success or -ENODEV if the restart hasn't succeeded
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*/
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int mei_restart(struct mei_device *dev)
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{
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int err;
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mutex_lock(&dev->device_lock);
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mei_clear_interrupts(dev);
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dev->dev_state = MEI_DEV_POWER_UP;
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dev->reset_count = 0;
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err = mei_reset(dev);
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mutex_unlock(&dev->device_lock);
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if (err == -ENODEV || dev->dev_state == MEI_DEV_DISABLED) {
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dev_err(dev->dev, "device disabled = %d\n", err);
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return -ENODEV;
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}
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/* try to start again */
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if (err)
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schedule_work(&dev->reset_work);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_restart);
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static void mei_reset_work(struct work_struct *work)
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{
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struct mei_device *dev =
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container_of(work, struct mei_device, reset_work);
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int ret;
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mutex_lock(&dev->device_lock);
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ret = mei_reset(dev);
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mutex_unlock(&dev->device_lock);
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if (dev->dev_state == MEI_DEV_DISABLED) {
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dev_err(dev->dev, "device disabled = %d\n", ret);
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return;
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}
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/* retry reset in case of failure */
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if (ret)
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schedule_work(&dev->reset_work);
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}
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void mei_stop(struct mei_device *dev)
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{
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dev_dbg(dev->dev, "stopping the device.\n");
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mei_cancel_work(dev);
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mei_nfc_host_exit(dev);
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mei_cl_bus_remove_devices(dev);
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mutex_lock(&dev->device_lock);
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mei_wd_stop(dev);
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dev->dev_state = MEI_DEV_POWER_DOWN;
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mei_reset(dev);
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/* move device to disabled state unconditionally */
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dev->dev_state = MEI_DEV_DISABLED;
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mutex_unlock(&dev->device_lock);
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mei_watchdog_unregister(dev);
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}
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EXPORT_SYMBOL_GPL(mei_stop);
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/**
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* mei_write_is_idle - check if the write queues are idle
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*
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* @dev: the device structure
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*
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* Return: true of there is no pending write
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*/
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bool mei_write_is_idle(struct mei_device *dev)
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{
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bool idle = (dev->dev_state == MEI_DEV_ENABLED &&
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list_empty(&dev->ctrl_wr_list.list) &&
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list_empty(&dev->write_list.list));
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dev_dbg(dev->dev, "write pg: is idle[%d] state=%s ctrl=%d write=%d\n",
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idle,
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mei_dev_state_str(dev->dev_state),
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list_empty(&dev->ctrl_wr_list.list),
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list_empty(&dev->write_list.list));
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return idle;
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}
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EXPORT_SYMBOL_GPL(mei_write_is_idle);
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/**
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* mei_device_init -- initialize mei_device structure
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*
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* @dev: the mei device
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* @device: the device structure
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* @hw_ops: hw operations
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*/
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void mei_device_init(struct mei_device *dev,
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struct device *device,
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const struct mei_hw_ops *hw_ops)
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{
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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->device_list);
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INIT_LIST_HEAD(&dev->me_clients);
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mutex_init(&dev->device_lock);
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init_waitqueue_head(&dev->wait_hw_ready);
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init_waitqueue_head(&dev->wait_pg);
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init_waitqueue_head(&dev->wait_hbm_start);
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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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dev->reset_count = 0;
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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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INIT_DELAYED_WORK(&dev->timer_work, mei_timer);
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INIT_WORK(&dev->init_work, mei_host_client_init);
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INIT_WORK(&dev->reset_work, mei_reset_work);
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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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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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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 client ID
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* 0: Reserved for MEI Bus Message communications
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*/
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bitmap_set(dev->host_clients_map, 0, 1);
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dev->pg_event = MEI_PG_EVENT_IDLE;
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dev->ops = hw_ops;
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dev->dev = device;
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}
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EXPORT_SYMBOL_GPL(mei_device_init);
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