/* * * 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. * */ #ifndef _MEI_DEV_H_ #define _MEI_DEV_H_ #include #include #include #include #include "hw.h" #include "hw-me-regs.h" /* * watch dog definition */ #define MEI_WD_HDR_SIZE 4 #define MEI_WD_STOP_MSG_SIZE MEI_WD_HDR_SIZE #define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16) #define MEI_WD_DEFAULT_TIMEOUT 120 /* seconds */ #define MEI_WD_MIN_TIMEOUT 120 /* seconds */ #define MEI_WD_MAX_TIMEOUT 65535 /* seconds */ #define MEI_WD_STOP_TIMEOUT 10 /* msecs */ #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0) #define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32)) /* * AMTHI Client UUID */ extern const uuid_le mei_amthif_guid; /* * Watchdog Client UUID */ extern const uuid_le mei_wd_guid; /* * Watchdog independence state message */ extern const u8 mei_wd_state_independence_msg[3][4]; /* * Number of Maximum MEI Clients */ #define MEI_CLIENTS_MAX 256 /* * Number of File descriptors/handles * that can be opened to the driver. * * Limit to 255: 256 Total Clients * minus internal client for MEI Bus Messags */ #define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1) /* * Internal Clients Number */ #define MEI_HOST_CLIENT_ID_ANY (-1) #define MEI_HBM_HOST_CLIENT_ID 0 /* not used, just for documentation */ #define MEI_WD_HOST_CLIENT_ID 1 #define MEI_IAMTHIF_HOST_CLIENT_ID 2 /* File state */ enum file_state { MEI_FILE_INITIALIZING = 0, MEI_FILE_CONNECTING, MEI_FILE_CONNECTED, MEI_FILE_DISCONNECTING, MEI_FILE_DISCONNECTED }; /* MEI device states */ enum mei_dev_state { MEI_DEV_INITIALIZING = 0, MEI_DEV_INIT_CLIENTS, MEI_DEV_ENABLED, MEI_DEV_RESETING, MEI_DEV_DISABLED, MEI_DEV_RECOVERING_FROM_RESET, MEI_DEV_POWER_DOWN, MEI_DEV_POWER_UP }; const char *mei_dev_state_str(int state); /* init clients states*/ enum mei_init_clients_states { MEI_START_MESSAGE = 0, MEI_ENUM_CLIENTS_MESSAGE, MEI_CLIENT_PROPERTIES_MESSAGE }; enum iamthif_states { MEI_IAMTHIF_IDLE, MEI_IAMTHIF_WRITING, MEI_IAMTHIF_FLOW_CONTROL, MEI_IAMTHIF_READING, MEI_IAMTHIF_READ_COMPLETE }; enum mei_file_transaction_states { MEI_IDLE, MEI_WRITING, MEI_WRITE_COMPLETE, MEI_FLOW_CONTROL, MEI_READING, MEI_READ_COMPLETE }; enum mei_wd_states { MEI_WD_IDLE, MEI_WD_RUNNING, MEI_WD_STOPPING, }; /** * enum mei_cb_file_ops - file operation associated with the callback * @MEI_FOP_READ - read * @MEI_FOP_WRITE - write * @MEI_FOP_IOCTL - ioctl * @MEI_FOP_OPEN - open * @MEI_FOP_CLOSE - close */ enum mei_cb_file_ops { MEI_FOP_READ = 0, MEI_FOP_WRITE, MEI_FOP_IOCTL, MEI_FOP_OPEN, MEI_FOP_CLOSE }; /* * Intel MEI message data struct */ struct mei_message_data { u32 size; unsigned char *data; }; /** * struct mei_me_client - representation of me (fw) client * * @props - client properties * @client_id - me client id * @mei_flow_ctrl_creds - flow control credits */ struct mei_me_client { struct mei_client_properties props; u8 client_id; u8 mei_flow_ctrl_creds; }; struct mei_cl; /** * struct mei_cl_cb - file operation callback structure * * @cl - file client who is running this operation * @fop_type - file operation type */ struct mei_cl_cb { struct list_head list; struct mei_cl *cl; enum mei_cb_file_ops fop_type; struct mei_message_data request_buffer; struct mei_message_data response_buffer; unsigned long buf_idx; unsigned long read_time; struct file *file_object; }; /* MEI client instance carried as file->pirvate_data*/ struct mei_cl { struct list_head link; struct mei_device *dev; enum file_state state; wait_queue_head_t tx_wait; wait_queue_head_t rx_wait; wait_queue_head_t wait; int status; /* ID of client connected */ u8 host_client_id; u8 me_client_id; u8 mei_flow_ctrl_creds; u8 timer_count; enum mei_file_transaction_states reading_state; enum mei_file_transaction_states writing_state; int sm_state; struct mei_cl_cb *read_cb; }; /** * struct mei_device - MEI private device struct * @mem_addr - mem mapped base register address * @hbuf_depth - depth of host(write) buffer * @wr_ext_msg - buffer for hbm control responses (set in read cycle) */ struct mei_device { struct pci_dev *pdev; /* pointer to pci device struct */ /* * lists of queues */ /* array of pointers to aio lists */ struct mei_cl_cb read_list; /* driver read queue */ struct mei_cl_cb write_list; /* driver write queue */ struct mei_cl_cb write_waiting_list; /* write waiting queue */ struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */ struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */ /* * list of files */ struct list_head file_list; long open_handle_count; /* * lock for the device */ struct mutex device_lock; /* device lock */ struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */ bool recvd_msg; u8 hbuf_depth; /* * waiting queue for receive message from FW */ wait_queue_head_t wait_recvd_msg; wait_queue_head_t wait_stop_wd; /* * mei device states */ enum mei_dev_state dev_state; enum mei_init_clients_states init_clients_state; u16 init_clients_timer; unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */ u32 rd_msg_hdr; /* used for control messages */ struct { struct mei_msg_hdr hdr; unsigned char data[128]; } wr_msg; struct { struct mei_msg_hdr hdr; unsigned char data[4]; /* All HBM messages are 4 bytes */ } wr_ext_msg; /* for control responses */ struct hbm_version version; struct mei_me_client *me_clients; /* Note: memory has to be allocated */ DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX); DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX); u8 me_clients_num; u8 me_client_presentation_num; u8 me_client_index; bool mei_host_buffer_is_empty; struct mei_cl wd_cl; enum mei_wd_states wd_state; bool wd_pending; u16 wd_timeout; unsigned char wd_data[MEI_WD_START_MSG_SIZE]; /* amthif list for cmd waiting */ struct mei_cl_cb amthif_cmd_list; /* driver managed amthif list for reading completed amthif cmd data */ struct mei_cl_cb amthif_rd_complete_list; struct file *iamthif_file_object; struct mei_cl iamthif_cl; struct mei_cl_cb *iamthif_current_cb; int iamthif_mtu; unsigned long iamthif_timer; u32 iamthif_stall_timer; unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */ u32 iamthif_msg_buf_size; u32 iamthif_msg_buf_index; enum iamthif_states iamthif_state; bool iamthif_flow_control_pending; bool iamthif_ioctl; bool iamthif_canceled; struct work_struct init_work; char hw[0] __aligned(sizeof(void *)); }; static inline unsigned long mei_secs_to_jiffies(unsigned long sec) { return msecs_to_jiffies(sec * MSEC_PER_SEC); } /* * mei init function prototypes */ void mei_device_init(struct mei_device *dev); void mei_reset(struct mei_device *dev, int interrupts); int mei_hw_init(struct mei_device *dev); /* * MEI interrupt functions prototype */ irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id); irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id); void mei_timer(struct work_struct *work); /* * AMTHIF - AMT Host Interface Functions */ void mei_amthif_reset_params(struct mei_device *dev); int mei_amthif_host_init(struct mei_device *dev); int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb); int mei_amthif_read(struct mei_device *dev, struct file *file, char __user *ubuf, size_t length, loff_t *offset); unsigned int mei_amthif_poll(struct mei_device *dev, struct file *file, poll_table *wait); int mei_amthif_release(struct mei_device *dev, struct file *file); struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev, struct file *file); void mei_amthif_run_next_cmd(struct mei_device *dev); int mei_amthif_irq_write_complete(struct mei_device *dev, s32 *slots, struct mei_cl_cb *cb, struct mei_cl_cb *cmpl_list); void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb); int mei_amthif_irq_read_message(struct mei_cl_cb *complete_list, struct mei_device *dev, struct mei_msg_hdr *mei_hdr); int mei_amthif_irq_read(struct mei_device *dev, s32 *slots); int mei_wd_send(struct mei_device *dev); int mei_wd_stop(struct mei_device *dev); int mei_wd_host_init(struct mei_device *dev); /* * mei_watchdog_register - Registering watchdog interface * once we got connection to the WD Client * @dev - mei device */ void mei_watchdog_register(struct mei_device *dev); /* * mei_watchdog_unregister - Unregistering watchdog interface * @dev - mei device */ void mei_watchdog_unregister(struct mei_device *dev); /* * Register Access Function */ void mei_hw_config(struct mei_device *dev); void mei_hw_reset(struct mei_device *dev, bool intr_enable); u32 mei_mecbrw_read(const struct mei_device *dev); void mei_clear_interrupts(struct mei_device *dev); void mei_enable_interrupts(struct mei_device *dev); void mei_disable_interrupts(struct mei_device *dev); void mei_host_set_ready(struct mei_device *dev); bool mei_host_is_ready(struct mei_device *dev); bool mei_me_is_ready(struct mei_device *dev); int mei_register(struct device *dev); void mei_deregister(void); #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d" #define MEI_HDR_PRM(hdr) \ (hdr)->host_addr, (hdr)->me_addr, \ (hdr)->length, (hdr)->msg_complete #endif