| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Tomas Winkler | 1257 | 63.71% | 88 | 67.69% |
| Alexander Usyskin | 379 | 19.21% | 32 | 24.62% |
| Oren Weil | 270 | 13.68% | 3 | 2.31% |
| Samuel Ortiz | 63 | 3.19% | 4 | 3.08% |
| Rafael J. Wysocki | 2 | 0.10% | 1 | 0.77% |
| Viresh Kumar | 1 | 0.05% | 1 | 0.77% |
| Bill Nottingham | 1 | 0.05% | 1 | 0.77% |
| Total | 1973 | 130 |
/* * * Intel Management Engine Interface (Intel MEI) Linux driver * Copyright (c) 2003-2018, 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 <linux/types.h> #include <linux/cdev.h> #include <linux/poll.h> #include <linux/mei.h> #include <linux/mei_cl_bus.h> #include "hw.h" #include "hbm.h" #define MEI_SLOT_SIZE sizeof(u32) #define MEI_RD_MSG_BUF_SIZE (128 * MEI_SLOT_SIZE) /* * 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) /* File state */ enum file_state { MEI_FILE_UNINITIALIZED = 0, MEI_FILE_INITIALIZING, MEI_FILE_CONNECTING, MEI_FILE_CONNECTED, MEI_FILE_DISCONNECTING, MEI_FILE_DISCONNECT_REPLY, MEI_FILE_DISCONNECT_REQUIRED, 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 mei_file_transaction_states { MEI_IDLE, MEI_WRITING, MEI_WRITE_COMPLETE, }; /** * 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 * @MEI_FOP_NOTIFY_START: start notification * @MEI_FOP_NOTIFY_STOP: stop notification */ enum mei_cb_file_ops { MEI_FOP_READ = 0, MEI_FOP_WRITE, MEI_FOP_CONNECT, MEI_FOP_DISCONNECT, MEI_FOP_DISCONNECT_RSP, MEI_FOP_NOTIFY_START, MEI_FOP_NOTIFY_STOP, }; /** * enum mei_cl_io_mode - io mode between driver and fw * * @MEI_CL_IO_TX_BLOCKING: send is blocking * @MEI_CL_IO_TX_INTERNAL: internal communication between driver and FW * * @MEI_CL_IO_RX_NONBLOCK: recv is non-blocking */ enum mei_cl_io_mode { MEI_CL_IO_TX_BLOCKING = BIT(0), MEI_CL_IO_TX_INTERNAL = BIT(1), MEI_CL_IO_RX_NONBLOCK = BIT(2), }; /* * Intel MEI message data struct */ struct mei_msg_data { size_t 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 * @tx_flow_ctrl_creds: flow control credits * @connect_count: number connections to this client * @bus_added: added to bus */ struct mei_me_client { struct list_head list; struct kref refcnt; struct mei_client_properties props; u8 client_id; u8 tx_flow_ctrl_creds; u8 connect_count; u8 bus_added; }; 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 * @fp: pointer to file structure * @status: io status of the cb * @internal: communication between driver and FW flag * @blocking: transmission blocking mode */ struct mei_cl_cb { struct list_head list; struct mei_cl *cl; enum mei_cb_file_ops fop_type; struct mei_msg_data buf; size_t buf_idx; const struct file *fp; int status; u32 internal:1; u32 blocking: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 * @ev_wait: notification wait queue * @ev_async: event async notification * @status: connection status * @me_cl: fw client connected * @fp: file associated with client * @host_client_id: host id * @tx_flow_ctrl_creds: transmit flow credentials * @rx_flow_ctrl_creds: receive flow credentials * @timer_count: watchdog timer for operation completion * @notify_en: notification - enabled/disabled * @notify_ev: pending notification event * @tx_cb_queued: number of tx callbacks in queue * @writing_state: state of the tx * @rd_pending: pending read credits * @rd_completed: completed read * * @cldev: device on the mei client bus */ 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; wait_queue_head_t ev_wait; struct fasync_struct *ev_async; int status; struct mei_me_client *me_cl; const struct file *fp; u8 host_client_id; u8 tx_flow_ctrl_creds; u8 rx_flow_ctrl_creds; u8 timer_count; u8 notify_en; u8 notify_ev; u8 tx_cb_queued; enum mei_file_transaction_states writing_state; struct list_head rd_pending; struct list_head rd_completed; struct mei_cl_device *cldev; }; #define MEI_TX_QUEUE_LIMIT_DEFAULT 50 #define MEI_TX_QUEUE_LIMIT_MAX 255 #define MEI_TX_QUEUE_LIMIT_MIN 30 /** * struct mei_hw_ops - hw specific 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_in_transition : is device now in pg transition * @pg_is_enabled : is power gating enabled * * @intr_clear : clear pending interrupts * @intr_enable : enable interrupts * @intr_disable : disable interrupts * @synchronize_irq : synchronize irqs * * @hbuf_free_slots : query for write buffer empty slots * @hbuf_is_ready : query if write buffer is empty * @hbuf_depth : query for write buffer depth * * @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_in_transition)(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); void (*synchronize_irq)(struct mei_device *dev); int (*hbuf_free_slots)(struct mei_device *dev); bool (*hbuf_is_ready)(struct mei_device *dev); u32 (*hbuf_depth)(const struct mei_device *dev); int (*write)(struct mei_device *dev, const void *hdr, size_t hdr_len, const void *data, size_t data_len); 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*/ void mei_cl_bus_rescan_work(struct work_struct *work); void mei_cl_bus_dev_fixup(struct mei_cl_device *dev); ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, unsigned int mode); ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, unsigned int mode, unsigned long timeout); bool mei_cl_bus_rx_event(struct mei_cl *cl); bool mei_cl_bus_notify_event(struct mei_cl *cl); void mei_cl_bus_remove_devices(struct mei_device *bus); int mei_cl_bus_init(void); void mei_cl_bus_exit(void); /** * 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 * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt */ enum mei_pg_event { MEI_PG_EVENT_IDLE, MEI_PG_EVENT_WAIT, MEI_PG_EVENT_RECEIVED, MEI_PG_EVENT_INTR_WAIT, MEI_PG_EVENT_INTR_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_fw_version - MEI FW version struct * * @platform: platform identifier * @major: major version field * @minor: minor version field * @buildno: build number version field * @hotfix: hotfix number version field */ struct mei_fw_version { u8 platform; u8 major; u16 minor; u16 buildno; u16 hotfix; }; #define MEI_MAX_FW_VER_BLOCKS 3 /** * 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 * @tx_queue_limit: tx queues per client linit * * @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 * * @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_is_ready : query if the host host/write buffer is ready * * @version : HBM protocol version in use * @hbm_f_pg_supported : hbm feature pgi protocol * @hbm_f_dc_supported : hbm feature dynamic clients * @hbm_f_dot_supported : hbm feature disconnect on timeout * @hbm_f_ev_supported : hbm feature event notification * @hbm_f_fa_supported : hbm feature fixed address client * @hbm_f_ie_supported : hbm feature immediate reply to enum request * @hbm_f_os_supported : hbm feature support OS ver message * @hbm_f_dr_supported : hbm feature dma ring supported * * @fw_ver : FW versions * * @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 * * @allow_fixed_address: allow user space to connect a fixed client * @override_fixed_address: force allow fixed address behavior * * @reset_work : work item for the device reset * @bus_rescan_work : work item for the bus rescan * * @device_list : mei client bus list * @cl_bus_lock : client bus list lock * * @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 list_head write_list; struct list_head write_waiting_list; struct list_head ctrl_wr_list; struct list_head ctrl_rd_list; u8 tx_queue_limit; 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; /* * 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 */ bool hbuf_is_ready; struct hbm_version version; unsigned int hbm_f_pg_supported:1; unsigned int hbm_f_dc_supported:1; unsigned int hbm_f_dot_supported:1; unsigned int hbm_f_ev_supported:1; unsigned int hbm_f_fa_supported:1; unsigned int hbm_f_ie_supported:1; unsigned int hbm_f_os_supported:1; unsigned int hbm_f_dr_supported:1; struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS]; 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); bool allow_fixed_address; bool override_fixed_address; struct work_struct reset_work; struct work_struct bus_rescan_work; /* List of bus devices */ struct list_head device_list; struct mutex cl_bus_lock; #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 from a message length * * @length: size of the messages in bytes * * Return: number of slots */ static inline u32 mei_data2slots(size_t length) { return DIV_ROUND_UP(length, MEI_SLOT_SIZE); } /** * mei_hbm2slots - get slots number from a hbm message length * length + size of the mei message header * * @length: size of the messages in bytes * * Return: number of slots */ static inline u32 mei_hbm2slots(size_t length) { return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, MEI_SLOT_SIZE); } /** * 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 * MEI_SLOT_SIZE; } /* * 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); void mei_schedule_stall_timer(struct mei_device *dev); int mei_irq_read_handler(struct mei_device *dev, struct list_head *cmpl_list, s32 *slots); int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list); void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list); /* * 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_in_transition(struct mei_device *dev) { return dev->ops->pg_in_transition(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 void mei_synchronize_irq(struct mei_device *dev) { dev->ops->synchronize_irq(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 u32 mei_hbuf_depth(const struct mei_device *dev) { return dev->ops->hbuf_depth(dev); } static inline int mei_write_message(struct mei_device *dev, const void *hdr, size_t hdr_len, const void *data, size_t data_len) { return dev->ops->write(dev, hdr, hdr_len, data, data_len); } 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 dma=%1d internal=%1d comp=%1d" #define MEI_HDR_PRM(hdr) \ (hdr)->host_addr, (hdr)->me_addr, \ (hdr)->length, (hdr)->dma_ring, (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
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