/* * * 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 #include "hw.h" #include "hbm.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; /* * Number of Maximum MEI Clients */ #define MEI_CLIENTS_MAX 256 /* * maximum number of consecutive resets */ #define MEI_MAX_CONSEC_RESET 3 /* * Number of File descriptors/handles * that can be opened to the driver. * * Limit to 255: 256 Total Clients * minus internal client for MEI Bus Messages */ #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_DISCONNECT_REPLY, MEI_FILE_DISCONNECTED, }; /* MEI device states */ enum mei_dev_state { MEI_DEV_INITIALIZING = 0, MEI_DEV_INIT_CLIENTS, MEI_DEV_ENABLED, MEI_DEV_RESETTING, MEI_DEV_DISABLED, MEI_DEV_POWER_DOWN, MEI_DEV_POWER_UP }; const char *mei_dev_state_str(int state); 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_CONNECT: connect * @MEI_FOP_DISCONNECT: disconnect * @MEI_FOP_DISCONNECT_RSP: disconnect response */ enum mei_cb_file_ops { MEI_FOP_READ = 0, MEI_FOP_WRITE, MEI_FOP_CONNECT, MEI_FOP_DISCONNECT, MEI_FOP_DISCONNECT_RSP, }; /* * Intel MEI message data struct */ struct mei_msg_data { u32 size; unsigned char *data; }; /* Maximum number of processed FW status registers */ #define MEI_FW_STATUS_MAX 6 /* Minimal buffer for FW status string (8 bytes in dw + space or '\0') */ #define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1)) /* * struct mei_fw_status - storage of FW status data * * @count: number of actually available elements in array * @status: FW status registers */ struct mei_fw_status { int count; u32 status[MEI_FW_STATUS_MAX]; }; /** * struct mei_me_client - representation of me (fw) client * * @list: link in me client list * @refcnt: struct reference count * @props: client properties * @client_id: me client id * @mei_flow_ctrl_creds: flow control credits */ struct mei_me_client { struct list_head list; struct kref refcnt; struct mei_client_properties props; u8 client_id; u8 mei_flow_ctrl_creds; }; struct mei_cl; /** * struct mei_cl_cb - file operation callback structure * * @list: link in callback queue * @cl: file client who is running this operation * @fop_type: file operation type * @buf: buffer for data associated with the callback * @buf_idx: last read index * @read_time: last read operation time stamp (iamthif) * @file_object: pointer to file structure * @status: io status of the cb * @internal: communication between driver and FW flag * @completed: the transfer or reception has completed */ struct mei_cl_cb { struct list_head list; struct mei_cl *cl; enum mei_cb_file_ops fop_type; struct mei_msg_data buf; unsigned long buf_idx; unsigned long read_time; struct file *file_object; int status; u32 internal:1; u32 completed:1; }; /** * struct mei_cl - me client host representation * carried in file->private_data * * @link: link in the clients list * @dev: mei parent device * @state: file operation state * @tx_wait: wait queue for tx completion * @rx_wait: wait queue for rx completion * @wait: wait queue for management operation * @status: connection status * @cl_uuid: client uuid name * @host_client_id: host id * @me_client_id: me/fw id * @mei_flow_ctrl_creds: transmit flow credentials * @timer_count: watchdog timer for operation completion * @writing_state: state of the tx * @rd_pending: pending read credits * @rd_completed: completed read * * @device: device on the mei client bus * @device_link: link to bus clients */ 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; uuid_le cl_uuid; u8 host_client_id; u8 me_client_id; u8 mei_flow_ctrl_creds; u8 timer_count; enum mei_file_transaction_states writing_state; struct list_head rd_pending; struct list_head rd_completed; /* MEI CL bus data */ struct mei_cl_device *device; struct list_head device_link; }; /** struct mei_hw_ops * * @host_is_ready : query for host readiness * @hw_is_ready : query if hw is ready * @hw_reset : reset hw * @hw_start : start hw after reset * @hw_config : configure hw * @fw_status : get fw status registers * @pg_state : power gating state of the device * @pg_is_enabled : is power gating enabled * @intr_clear : clear pending interrupts * @intr_enable : enable interrupts * @intr_disable : disable interrupts * @hbuf_free_slots : query for write buffer empty slots * @hbuf_is_ready : query if write buffer is empty * @hbuf_max_len : query for write buffer max len * @write : write a message to FW * @rdbuf_full_slots : query how many slots are filled * @read_hdr : get first 4 bytes (header) * @read : read a buffer from the FW */ struct mei_hw_ops { bool (*host_is_ready)(struct mei_device *dev); bool (*hw_is_ready)(struct mei_device *dev); int (*hw_reset)(struct mei_device *dev, bool enable); int (*hw_start)(struct mei_device *dev); void (*hw_config)(struct mei_device *dev); int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts); enum mei_pg_state (*pg_state)(struct mei_device *dev); bool (*pg_is_enabled)(struct mei_device *dev); void (*intr_clear)(struct mei_device *dev); void (*intr_enable)(struct mei_device *dev); void (*intr_disable)(struct mei_device *dev); int (*hbuf_free_slots)(struct mei_device *dev); bool (*hbuf_is_ready)(struct mei_device *dev); size_t (*hbuf_max_len)(const struct mei_device *dev); int (*write)(struct mei_device *dev, struct mei_msg_hdr *hdr, unsigned char *buf); int (*rdbuf_full_slots)(struct mei_device *dev); u32 (*read_hdr)(const struct mei_device *dev); int (*read)(struct mei_device *dev, unsigned char *buf, unsigned long len); }; /* MEI bus API*/ /** * struct mei_cl_ops - MEI CL device ops * This structure allows ME host clients to implement technology * specific operations. * * @enable: Enable an MEI CL device. Some devices require specific * HECI commands to initialize completely. * @disable: Disable an MEI CL device. * @send: Tx hook for the device. This allows ME host clients to trap * the device driver buffers before actually physically * pushing it to the ME. * @recv: Rx hook for the device. This allows ME host clients to trap the * ME buffers before forwarding them to the device driver. */ struct mei_cl_ops { int (*enable)(struct mei_cl_device *device); int (*disable)(struct mei_cl_device *device); int (*send)(struct mei_cl_device *device, u8 *buf, size_t length); int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length); }; struct mei_cl_device *mei_cl_add_device(struct mei_device *dev, uuid_le uuid, char *name, struct mei_cl_ops *ops); void mei_cl_remove_device(struct mei_cl_device *device); ssize_t __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length); ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length); ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length); void mei_cl_bus_rx_event(struct mei_cl *cl); void mei_cl_bus_remove_devices(struct mei_device *dev); int mei_cl_bus_init(void); void mei_cl_bus_exit(void); struct mei_cl *mei_cl_bus_find_cl_by_uuid(struct mei_device *dev, uuid_le uuid); /** * struct mei_cl_device - MEI device handle * An mei_cl_device pointer is returned from mei_add_device() * and links MEI bus clients to their actual ME host client pointer. * Drivers for MEI devices will get an mei_cl_device pointer * when being probed and shall use it for doing ME bus I/O. * * @dev: linux driver model device pointer * @cl: mei client * @ops: ME transport ops * @event_work: async work to execute event callback * @event_cb: Drivers register this callback to get asynchronous ME * events (e.g. Rx buffer pending) notifications. * @event_context: event callback run context * @events: Events bitmask sent to the driver. * @priv_data: client private data */ struct mei_cl_device { struct device dev; struct mei_cl *cl; const struct mei_cl_ops *ops; struct work_struct event_work; mei_cl_event_cb_t event_cb; void *event_context; unsigned long events; void *priv_data; }; /** * enum mei_pg_event - power gating transition events * * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete * @MEI_PG_EVENT_RECEIVED: the driver received pg event */ enum mei_pg_event { MEI_PG_EVENT_IDLE, MEI_PG_EVENT_WAIT, MEI_PG_EVENT_RECEIVED, }; /** * enum mei_pg_state - device internal power gating state * * @MEI_PG_OFF: device is not power gated - it is active * @MEI_PG_ON: device is power gated - it is in lower power state */ enum mei_pg_state { MEI_PG_OFF = 0, MEI_PG_ON = 1, }; const char *mei_pg_state_str(enum mei_pg_state state); /** * struct mei_device - MEI private device struct * * @dev : device on a bus * @cdev : character device * @minor : minor number allocated for device * * @write_list : write pending list * @write_waiting_list : write completion list * @ctrl_wr_list : pending control write list * @ctrl_rd_list : pending control read list * * @file_list : list of opened handles * @open_handle_count: number of opened handles * * @device_lock : big device lock * @timer_work : MEI timer delayed work (timeouts) * * @recvd_hw_ready : hw ready message received flag * * @wait_hw_ready : wait queue for receive HW ready message form FW * @wait_pg : wait queue for receive PG message from FW * @wait_hbm_start : wait queue for receive HBM start message from FW * @wait_stop_wd : wait queue for receive WD stop message from FW * * @reset_count : number of consecutive resets * @dev_state : device state * @hbm_state : state of host bus message protocol * @init_clients_timer : HBM init handshake timeout * * @pg_event : power gating event * @pg_domain : runtime PM domain * * @rd_msg_buf : control messages buffer * @rd_msg_hdr : read message header storage * * @hbuf_depth : depth of hardware host/write buffer is slots * @hbuf_is_ready : query if the host host/write buffer is ready * @wr_msg : the buffer for hbm control messages * * @version : HBM protocol version in use * @hbm_f_pg_supported : hbm feature pgi protocol * * @me_clients_rwsem: rw lock over me_clients list * @me_clients : list of FW clients * @me_clients_map : FW clients bit map * @host_clients_map : host clients id pool * @me_client_index : last FW client index in enumeration * * @wd_cl : watchdog client * @wd_state : watchdog client state * @wd_pending : watchdog command is pending * @wd_timeout : watchdog expiration timeout * @wd_data : watchdog message buffer * * @amthif_cmd_list : amthif list for cmd waiting * @amthif_rd_complete_list : amthif list for reading completed cmd data * @iamthif_file_object : file for current amthif operation * @iamthif_cl : amthif host client * @iamthif_current_cb : amthif current operation callback * @iamthif_open_count : number of opened amthif connections * @iamthif_mtu : amthif client max message length * @iamthif_timer : time stamp of current amthif command completion * @iamthif_stall_timer : timer to detect amthif hang * @iamthif_state : amthif processor state * @iamthif_canceled : current amthif command is canceled * * @init_work : work item for the device init * @reset_work : work item for the device reset * * @device_list : mei client bus list * * @dbgfs_dir : debugfs mei root directory * * @ops: : hw specific operations * @hw : hw specific data */ struct mei_device { struct device *dev; struct cdev cdev; int minor; struct mei_cl_cb write_list; struct mei_cl_cb write_waiting_list; struct mei_cl_cb ctrl_wr_list; struct mei_cl_cb ctrl_rd_list; struct list_head file_list; long open_handle_count; struct mutex device_lock; struct delayed_work timer_work; bool recvd_hw_ready; /* * waiting queue for receive message from FW */ wait_queue_head_t wait_hw_ready; wait_queue_head_t wait_pg; wait_queue_head_t wait_hbm_start; wait_queue_head_t wait_stop_wd; /* * mei device states */ unsigned long reset_count; enum mei_dev_state dev_state; enum mei_hbm_state hbm_state; u16 init_clients_timer; /* * Power Gating support */ enum mei_pg_event pg_event; #ifdef CONFIG_PM struct dev_pm_domain pg_domain; #endif /* CONFIG_PM */ unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; u32 rd_msg_hdr; /* write buffer */ u8 hbuf_depth; bool hbuf_is_ready; /* used for control messages */ struct { struct mei_msg_hdr hdr; unsigned char data[128]; } wr_msg; struct hbm_version version; unsigned int hbm_f_pg_supported:1; struct rw_semaphore me_clients_rwsem; struct list_head me_clients; DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX); DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX); unsigned long me_client_index; 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; long iamthif_open_count; int iamthif_mtu; unsigned long iamthif_timer; u32 iamthif_stall_timer; enum iamthif_states iamthif_state; bool iamthif_canceled; struct work_struct init_work; struct work_struct reset_work; /* List of bus devices */ struct list_head device_list; #if IS_ENABLED(CONFIG_DEBUG_FS) struct dentry *dbgfs_dir; #endif /* CONFIG_DEBUG_FS */ const struct mei_hw_ops *ops; 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_data2slots - get slots - number of (dwords) from a message length * + size of the mei header * * @length: size of the messages in bytes * * Return: number of slots */ static inline u32 mei_data2slots(size_t length) { return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4); } /** * mei_slots2data - get data in slots - bytes from slots * * @slots: number of available slots * * Return: number of bytes in slots */ static inline u32 mei_slots2data(int slots) { return slots * 4; } /* * mei init function prototypes */ void mei_device_init(struct mei_device *dev, struct device *device, const struct mei_hw_ops *hw_ops); int mei_reset(struct mei_device *dev); int mei_start(struct mei_device *dev); int mei_restart(struct mei_device *dev); void mei_stop(struct mei_device *dev); void mei_cancel_work(struct mei_device *dev); /* * MEI interrupt functions prototype */ void mei_timer(struct work_struct *work); int mei_irq_read_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list, s32 *slots); int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list); /* * 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_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); int mei_amthif_write(struct mei_cl *cl, struct mei_cl_cb *cb); int mei_amthif_run_next_cmd(struct mei_device *dev); int mei_amthif_irq_write(struct mei_cl *cl, 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_msg(struct mei_cl *cl, struct mei_msg_hdr *mei_hdr, struct mei_cl_cb *complete_list); int mei_amthif_irq_read(struct mei_device *dev, s32 *slots); /* * NFC functions */ int mei_nfc_host_init(struct mei_device *dev); void mei_nfc_host_exit(struct mei_device *dev); /* * NFC Client UUID */ extern const uuid_le mei_nfc_guid; 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 */ int 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 */ static inline void mei_hw_config(struct mei_device *dev) { dev->ops->hw_config(dev); } static inline enum mei_pg_state mei_pg_state(struct mei_device *dev) { return dev->ops->pg_state(dev); } static inline bool mei_pg_is_enabled(struct mei_device *dev) { return dev->ops->pg_is_enabled(dev); } static inline int mei_hw_reset(struct mei_device *dev, bool enable) { return dev->ops->hw_reset(dev, enable); } static inline int mei_hw_start(struct mei_device *dev) { return dev->ops->hw_start(dev); } static inline void mei_clear_interrupts(struct mei_device *dev) { dev->ops->intr_clear(dev); } static inline void mei_enable_interrupts(struct mei_device *dev) { dev->ops->intr_enable(dev); } static inline void mei_disable_interrupts(struct mei_device *dev) { dev->ops->intr_disable(dev); } static inline bool mei_host_is_ready(struct mei_device *dev) { return dev->ops->host_is_ready(dev); } static inline bool mei_hw_is_ready(struct mei_device *dev) { return dev->ops->hw_is_ready(dev); } static inline bool mei_hbuf_is_ready(struct mei_device *dev) { return dev->ops->hbuf_is_ready(dev); } static inline int mei_hbuf_empty_slots(struct mei_device *dev) { return dev->ops->hbuf_free_slots(dev); } static inline size_t mei_hbuf_max_len(const struct mei_device *dev) { return dev->ops->hbuf_max_len(dev); } static inline int mei_write_message(struct mei_device *dev, struct mei_msg_hdr *hdr, unsigned char *buf) { return dev->ops->write(dev, hdr, buf); } static inline u32 mei_read_hdr(const struct mei_device *dev) { return dev->ops->read_hdr(dev); } static inline void mei_read_slots(struct mei_device *dev, unsigned char *buf, unsigned long len) { dev->ops->read(dev, buf, len); } static inline int mei_count_full_read_slots(struct mei_device *dev) { return dev->ops->rdbuf_full_slots(dev); } static inline int mei_fw_status(struct mei_device *dev, struct mei_fw_status *fw_status) { return dev->ops->fw_status(dev, fw_status); } bool mei_hbuf_acquire(struct mei_device *dev); bool mei_write_is_idle(struct mei_device *dev); #if IS_ENABLED(CONFIG_DEBUG_FS) int mei_dbgfs_register(struct mei_device *dev, const char *name); void mei_dbgfs_deregister(struct mei_device *dev); #else static inline int mei_dbgfs_register(struct mei_device *dev, const char *name) { return 0; } static inline void mei_dbgfs_deregister(struct mei_device *dev) {} #endif /* CONFIG_DEBUG_FS */ int mei_register(struct mei_device *dev, struct device *parent); void mei_deregister(struct mei_device *dev); #define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d internal=%1d comp=%1d" #define MEI_HDR_PRM(hdr) \ (hdr)->host_addr, (hdr)->me_addr, \ (hdr)->length, (hdr)->internal, (hdr)->msg_complete ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len); /** * mei_fw_status_str - fetch and convert fw status registers to printable string * * @dev: the device structure * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ * * Return: number of bytes written or < 0 on failure */ static inline ssize_t mei_fw_status_str(struct mei_device *dev, char *buf, size_t len) { struct mei_fw_status fw_status; int ret; buf[0] = '\0'; ret = mei_fw_status(dev, &fw_status); if (ret) return ret; ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ); return ret; } #endif