/* * * Intel Management Engine Interface (Intel MEI) Linux driver * Copyright (c) 2003-2012, Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * */ #include #include #include #include #include #include "mei_dev.h" #include "interface.h" #include "client.h" const char *mei_dev_state_str(int state) { #define MEI_DEV_STATE(state) case MEI_DEV_##state: return #state switch (state) { MEI_DEV_STATE(INITIALIZING); MEI_DEV_STATE(INIT_CLIENTS); MEI_DEV_STATE(ENABLED); MEI_DEV_STATE(RESETING); MEI_DEV_STATE(DISABLED); MEI_DEV_STATE(RECOVERING_FROM_RESET); MEI_DEV_STATE(POWER_DOWN); MEI_DEV_STATE(POWER_UP); default: return "unkown"; } #undef MEI_DEV_STATE } /** * init_mei_device - allocates and initializes the mei device structure * * @pdev: The pci device structure * * returns The mei_device_device pointer on success, NULL on failure. */ struct mei_device *mei_device_init(struct pci_dev *pdev) { struct mei_device *dev; dev = kzalloc(sizeof(struct mei_device), GFP_KERNEL); if (!dev) return NULL; /* setup our list array */ INIT_LIST_HEAD(&dev->file_list); INIT_LIST_HEAD(&dev->wd_cl.link); INIT_LIST_HEAD(&dev->iamthif_cl.link); mutex_init(&dev->device_lock); init_waitqueue_head(&dev->wait_recvd_msg); init_waitqueue_head(&dev->wait_stop_wd); dev->dev_state = MEI_DEV_INITIALIZING; dev->iamthif_state = MEI_IAMTHIF_IDLE; mei_io_list_init(&dev->read_list); mei_io_list_init(&dev->write_list); mei_io_list_init(&dev->write_waiting_list); mei_io_list_init(&dev->ctrl_wr_list); mei_io_list_init(&dev->ctrl_rd_list); mei_io_list_init(&dev->amthif_cmd_list); mei_io_list_init(&dev->amthif_rd_complete_list); dev->pdev = pdev; return dev; } /** * mei_hw_init - initializes host and fw to start work. * * @dev: the device structure * * returns 0 on success, <0 on failure. */ int mei_hw_init(struct mei_device *dev) { int err = 0; int ret; mutex_lock(&dev->device_lock); dev->host_hw_state = mei_hcsr_read(dev); dev->me_hw_state = mei_mecsr_read(dev); dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, mestate = 0x%08x.\n", dev->host_hw_state, dev->me_hw_state); /* acknowledge interrupt and stop interupts */ mei_clear_interrupts(dev); /* Doesn't change in runtime */ dev->hbuf_depth = (dev->host_hw_state & H_CBD) >> 24; dev->recvd_msg = false; dev_dbg(&dev->pdev->dev, "reset in start the mei device.\n"); mei_reset(dev, 1); dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", dev->host_hw_state, dev->me_hw_state); /* wait for ME to turn on ME_RDY */ if (!dev->recvd_msg) { mutex_unlock(&dev->device_lock); err = wait_event_interruptible_timeout(dev->wait_recvd_msg, dev->recvd_msg, mei_secs_to_jiffies(MEI_INTEROP_TIMEOUT)); mutex_lock(&dev->device_lock); } if (err <= 0 && !dev->recvd_msg) { dev->dev_state = MEI_DEV_DISABLED; dev_dbg(&dev->pdev->dev, "wait_event_interruptible_timeout failed" "on wait for ME to turn on ME_RDY.\n"); ret = -ENODEV; goto out; } if (!(((dev->host_hw_state & H_RDY) == H_RDY) && ((dev->me_hw_state & ME_RDY_HRA) == ME_RDY_HRA))) { dev->dev_state = MEI_DEV_DISABLED; dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", dev->host_hw_state, dev->me_hw_state); if (!(dev->host_hw_state & H_RDY)) dev_dbg(&dev->pdev->dev, "host turn off H_RDY.\n"); if (!(dev->me_hw_state & ME_RDY_HRA)) dev_dbg(&dev->pdev->dev, "ME turn off ME_RDY.\n"); dev_err(&dev->pdev->dev, "link layer initialization failed.\n"); ret = -ENODEV; goto out; } if (dev->version.major_version != HBM_MAJOR_VERSION || dev->version.minor_version != HBM_MINOR_VERSION) { dev_dbg(&dev->pdev->dev, "MEI start failed.\n"); ret = -ENODEV; goto out; } dev->recvd_msg = false; dev_dbg(&dev->pdev->dev, "host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", dev->host_hw_state, dev->me_hw_state); dev_dbg(&dev->pdev->dev, "ME turn on ME_RDY and host turn on H_RDY.\n"); dev_dbg(&dev->pdev->dev, "link layer has been established.\n"); dev_dbg(&dev->pdev->dev, "MEI start success.\n"); ret = 0; out: mutex_unlock(&dev->device_lock); return ret; } /** * mei_hw_reset - resets fw via mei csr register. * * @dev: the device structure * @interrupts_enabled: if interrupt should be enabled after reset. */ static void mei_hw_reset(struct mei_device *dev, int interrupts_enabled) { dev->host_hw_state |= (H_RST | H_IG); if (interrupts_enabled) mei_enable_interrupts(dev); else mei_disable_interrupts(dev); } /** * mei_reset - resets host and fw. * * @dev: the device structure * @interrupts_enabled: if interrupt should be enabled after reset. */ void mei_reset(struct mei_device *dev, int interrupts_enabled) { struct mei_cl *cl_pos = NULL; struct mei_cl *cl_next = NULL; struct mei_cl_cb *cb_pos = NULL; struct mei_cl_cb *cb_next = NULL; bool unexpected; if (dev->dev_state == MEI_DEV_RECOVERING_FROM_RESET) { dev->need_reset = true; return; } unexpected = (dev->dev_state != MEI_DEV_INITIALIZING && dev->dev_state != MEI_DEV_DISABLED && dev->dev_state != MEI_DEV_POWER_DOWN && dev->dev_state != MEI_DEV_POWER_UP); dev->host_hw_state = mei_hcsr_read(dev); dev_dbg(&dev->pdev->dev, "before reset host_hw_state = 0x%08x.\n", dev->host_hw_state); mei_hw_reset(dev, interrupts_enabled); dev->host_hw_state &= ~H_RST; dev->host_hw_state |= H_IG; mei_hcsr_set(dev); dev_dbg(&dev->pdev->dev, "currently saved host_hw_state = 0x%08x.\n", dev->host_hw_state); dev->need_reset = false; if (dev->dev_state != MEI_DEV_INITIALIZING) { if (dev->dev_state != MEI_DEV_DISABLED && dev->dev_state != MEI_DEV_POWER_DOWN) dev->dev_state = MEI_DEV_RESETING; list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) { cl_pos->state = MEI_FILE_DISCONNECTED; cl_pos->mei_flow_ctrl_creds = 0; cl_pos->read_cb = NULL; cl_pos->timer_count = 0; } /* remove entry if already in list */ dev_dbg(&dev->pdev->dev, "remove iamthif and wd from the file list.\n"); mei_cl_unlink(&dev->wd_cl); mei_cl_unlink(&dev->iamthif_cl); mei_amthif_reset_params(dev); memset(&dev->wr_ext_msg, 0, sizeof(dev->wr_ext_msg)); } dev->me_clients_num = 0; dev->rd_msg_hdr = 0; dev->wd_pending = false; /* update the state of the registers after reset */ dev->host_hw_state = mei_hcsr_read(dev); dev->me_hw_state = mei_mecsr_read(dev); dev_dbg(&dev->pdev->dev, "after reset host_hw_state = 0x%08x, me_hw_state = 0x%08x.\n", dev->host_hw_state, dev->me_hw_state); if (unexpected) dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n", mei_dev_state_str(dev->dev_state)); /* Wake up all readings so they can be interrupted */ list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) { if (waitqueue_active(&cl_pos->rx_wait)) { dev_dbg(&dev->pdev->dev, "Waking up client!\n"); wake_up_interruptible(&cl_pos->rx_wait); } } /* remove all waiting requests */ list_for_each_entry_safe(cb_pos, cb_next, &dev->write_list.list, list) { list_del(&cb_pos->list); mei_io_cb_free(cb_pos); } } /** * allocate_me_clients_storage - allocates storage for me clients * * @dev: the device structure * * returns none. */ void mei_allocate_me_clients_storage(struct mei_device *dev) { struct mei_me_client *clients; int b; /* count how many ME clients we have */ for_each_set_bit(b, dev->me_clients_map, MEI_CLIENTS_MAX) dev->me_clients_num++; if (dev->me_clients_num <= 0) return ; if (dev->me_clients != NULL) { kfree(dev->me_clients); dev->me_clients = NULL; } dev_dbg(&dev->pdev->dev, "memory allocation for ME clients size=%zd.\n", dev->me_clients_num * sizeof(struct mei_me_client)); /* allocate storage for ME clients representation */ clients = kcalloc(dev->me_clients_num, sizeof(struct mei_me_client), GFP_KERNEL); if (!clients) { dev_dbg(&dev->pdev->dev, "memory allocation for ME clients failed.\n"); dev->dev_state = MEI_DEV_RESETING; mei_reset(dev, 1); return ; } dev->me_clients = clients; return ; }