/* * * 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 "mei_dev.h" #include "hw.h" #include "interface.h" #include 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 } /** * mei_io_list_flush - removes list entry belonging to cl. * * @list: An instance of our list structure * @cl: private data of the file object */ void mei_io_list_flush(struct mei_cl_cb *list, struct mei_cl *cl) { struct mei_cl_cb *pos; struct mei_cl_cb *next; list_for_each_entry_safe(pos, next, &list->list, list) { if (pos->cl) { if (mei_cl_cmp_id(cl, pos->cl)) list_del(&pos->list); } } } /** * mei_cl_flush_queues - flushes queue lists belonging to cl. * * @dev: the device structure * @cl: private data of the file object */ int mei_cl_flush_queues(struct mei_cl *cl) { if (!cl || !cl->dev) return -EINVAL; dev_dbg(&cl->dev->pdev->dev, "remove list entry belonging to cl\n"); mei_io_list_flush(&cl->dev->read_list, cl); mei_io_list_flush(&cl->dev->write_list, cl); mei_io_list_flush(&cl->dev->write_waiting_list, cl); mei_io_list_flush(&cl->dev->ctrl_wr_list, cl); mei_io_list_flush(&cl->dev->ctrl_rd_list, cl); mei_io_list_flush(&cl->dev->amthif_cmd_list, cl); mei_io_list_flush(&cl->dev->amthif_rd_complete_list, cl); return 0; } /** * 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 */ if ((dev->host_hw_state & H_IS) == H_IS) mei_reg_write(dev, H_CSR, dev->host_hw_state); /* 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_me_cl_unlink(dev, &dev->wd_cl); mei_me_cl_unlink(dev, &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); } } /** * host_start_message - mei host sends start message. * * @dev: the device structure * * returns none. */ void mei_host_start_message(struct mei_device *dev) { struct mei_msg_hdr *mei_hdr; struct hbm_host_version_request *start_req; const size_t len = sizeof(struct hbm_host_version_request); mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len); /* host start message */ start_req = (struct hbm_host_version_request *)&dev->wr_msg_buf[1]; memset(start_req, 0, len); start_req->hbm_cmd = HOST_START_REQ_CMD; start_req->host_version.major_version = HBM_MAJOR_VERSION; start_req->host_version.minor_version = HBM_MINOR_VERSION; dev->recvd_msg = false; if (mei_write_message(dev, mei_hdr, (unsigned char *)start_req)) { dev_dbg(&dev->pdev->dev, "write send version message to FW fail.\n"); dev->dev_state = MEI_DEV_RESETING; mei_reset(dev, 1); } dev->init_clients_state = MEI_START_MESSAGE; dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT; return ; } /** * host_enum_clients_message - host sends enumeration client request message. * * @dev: the device structure * * returns none. */ void mei_host_enum_clients_message(struct mei_device *dev) { struct mei_msg_hdr *mei_hdr; struct hbm_host_enum_request *enum_req; const size_t len = sizeof(struct hbm_host_enum_request); /* enumerate clients */ mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len); enum_req = (struct hbm_host_enum_request *) &dev->wr_msg_buf[1]; memset(enum_req, 0, sizeof(struct hbm_host_enum_request)); enum_req->hbm_cmd = HOST_ENUM_REQ_CMD; if (mei_write_message(dev, mei_hdr, (unsigned char *)enum_req)) { dev->dev_state = MEI_DEV_RESETING; dev_dbg(&dev->pdev->dev, "write send enumeration request message to FW fail.\n"); mei_reset(dev, 1); } dev->init_clients_state = MEI_ENUM_CLIENTS_MESSAGE; dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT; return; } /** * 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 ; } void mei_host_client_init(struct work_struct *work) { struct mei_device *dev = container_of(work, struct mei_device, init_work); struct mei_client_properties *client_props; int i; mutex_lock(&dev->device_lock); bitmap_zero(dev->host_clients_map, MEI_CLIENTS_MAX); dev->open_handle_count = 0; /* * Reserving the first three client IDs * 0: Reserved for MEI Bus Message communications * 1: Reserved for Watchdog * 2: Reserved for AMTHI */ bitmap_set(dev->host_clients_map, 0, 3); for (i = 0; i < dev->me_clients_num; i++) { client_props = &dev->me_clients[i].props; if (!uuid_le_cmp(client_props->protocol_name, mei_amthi_guid)) mei_amthif_host_init(dev); else if (!uuid_le_cmp(client_props->protocol_name, mei_wd_guid)) mei_wd_host_init(dev); } dev->dev_state = MEI_DEV_ENABLED; mutex_unlock(&dev->device_lock); } int mei_host_client_enumerate(struct mei_device *dev) { struct mei_msg_hdr *mei_hdr; struct hbm_props_request *prop_req; const size_t len = sizeof(struct hbm_props_request); unsigned long next_client_index; u8 client_num; client_num = dev->me_client_presentation_num; next_client_index = find_next_bit(dev->me_clients_map, MEI_CLIENTS_MAX, dev->me_client_index); /* We got all client properties */ if (next_client_index == MEI_CLIENTS_MAX) { schedule_work(&dev->init_work); return 0; } dev->me_clients[client_num].client_id = next_client_index; dev->me_clients[client_num].mei_flow_ctrl_creds = 0; mei_hdr = mei_hbm_hdr(&dev->wr_msg_buf[0], len); prop_req = (struct hbm_props_request *)&dev->wr_msg_buf[1]; memset(prop_req, 0, sizeof(struct hbm_props_request)); prop_req->hbm_cmd = HOST_CLIENT_PROPERTIES_REQ_CMD; prop_req->address = next_client_index; if (mei_write_message(dev, mei_hdr, (unsigned char *) prop_req)) { dev->dev_state = MEI_DEV_RESETING; dev_err(&dev->pdev->dev, "Properties request command failed\n"); mei_reset(dev, 1); return -EIO; } dev->init_clients_timer = MEI_CLIENTS_INIT_TIMEOUT; dev->me_client_index = next_client_index; return 0; } /** * mei_init_file_private - initializes private file structure. * * @priv: private file structure to be initialized * @file: the file structure */ void mei_cl_init(struct mei_cl *priv, struct mei_device *dev) { memset(priv, 0, sizeof(struct mei_cl)); init_waitqueue_head(&priv->wait); init_waitqueue_head(&priv->rx_wait); init_waitqueue_head(&priv->tx_wait); INIT_LIST_HEAD(&priv->link); priv->reading_state = MEI_IDLE; priv->writing_state = MEI_IDLE; priv->dev = dev; } int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid) { int i, res = -ENOENT; for (i = 0; i < dev->me_clients_num; ++i) if (uuid_le_cmp(*cuuid, dev->me_clients[i].props.protocol_name) == 0) { res = i; break; } return res; } /** * mei_me_cl_link - create link between host and me clinet and add * me_cl to the list * * @dev: the device structure * @cl: link between me and host client assocated with opened file descriptor * @cuuid: uuid of ME client * @client_id: id of the host client * * returns ME client index if ME client * -EINVAL on incorrect values * -ENONET if client not found */ int mei_me_cl_link(struct mei_device *dev, struct mei_cl *cl, const uuid_le *cuuid, u8 host_cl_id) { int i; if (!dev || !cl || !cuuid) return -EINVAL; /* check for valid client id */ i = mei_me_cl_by_uuid(dev, cuuid); if (i >= 0) { cl->me_client_id = dev->me_clients[i].client_id; cl->state = MEI_FILE_CONNECTING; cl->host_client_id = host_cl_id; list_add_tail(&cl->link, &dev->file_list); return (u8)i; } return -ENOENT; } /** * mei_me_cl_unlink - remove me_cl from the list * * @dev: the device structure * @host_client_id: host client id to be removed */ void mei_me_cl_unlink(struct mei_device *dev, struct mei_cl *cl) { struct mei_cl *pos, *next; list_for_each_entry_safe(pos, next, &dev->file_list, link) { if (cl->host_client_id == pos->host_client_id) { dev_dbg(&dev->pdev->dev, "remove host client = %d, ME client = %d\n", pos->host_client_id, pos->me_client_id); list_del_init(&pos->link); break; } } } /** * mei_alloc_file_private - allocates a private file structure and sets it up. * @file: the file structure * * returns The allocated file or NULL on failure */ struct mei_cl *mei_cl_allocate(struct mei_device *dev) { struct mei_cl *cl; cl = kmalloc(sizeof(struct mei_cl), GFP_KERNEL); if (!cl) return NULL; mei_cl_init(cl, dev); return cl; } /** * mei_disconnect_host_client - sends disconnect message to fw from host client. * * @dev: the device structure * @cl: private data of the file object * * Locking: called under "dev->device_lock" lock * * returns 0 on success, <0 on failure. */ int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl) { struct mei_cl_cb *cb; int rets, err; if (!dev || !cl) return -ENODEV; if (cl->state != MEI_FILE_DISCONNECTING) return 0; cb = mei_io_cb_init(cl, NULL); if (!cb) return -ENOMEM; cb->fop_type = MEI_FOP_CLOSE; if (dev->mei_host_buffer_is_empty) { dev->mei_host_buffer_is_empty = false; if (mei_disconnect(dev, cl)) { rets = -ENODEV; dev_dbg(&dev->pdev->dev, "failed to call mei_disconnect.\n"); goto free; } mdelay(10); /* Wait for hardware disconnection ready */ list_add_tail(&cb->list, &dev->ctrl_rd_list.list); } else { dev_dbg(&dev->pdev->dev, "add disconnect cb to control write list\n"); list_add_tail(&cb->list, &dev->ctrl_wr_list.list); } mutex_unlock(&dev->device_lock); err = wait_event_timeout(dev->wait_recvd_msg, MEI_FILE_DISCONNECTED == cl->state, mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); mutex_lock(&dev->device_lock); if (MEI_FILE_DISCONNECTED == cl->state) { rets = 0; dev_dbg(&dev->pdev->dev, "successfully disconnected from FW client.\n"); } else { rets = -ENODEV; if (MEI_FILE_DISCONNECTED != cl->state) dev_dbg(&dev->pdev->dev, "wrong status client disconnect.\n"); if (err) dev_dbg(&dev->pdev->dev, "wait failed disconnect err=%08x\n", err); dev_dbg(&dev->pdev->dev, "failed to disconnect from FW client.\n"); } mei_io_list_flush(&dev->ctrl_rd_list, cl); mei_io_list_flush(&dev->ctrl_wr_list, cl); free: mei_io_cb_free(cb); return rets; }