/* * * Intel Management Engine Interface (Intel MEI) Linux driver * Copyright (c) 2003-2011, 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/watchdog.h> #include "mei.h" #include "hw.h" /* * watch dog definition */ #define MEI_WATCHDOG_DATA_SIZE 16 #define MEI_START_WD_DATA_SIZE 20 #define MEI_WD_PARAMS_SIZE 4 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0) /* * MEI PCI Device object */ extern struct pci_dev *mei_device; /* * AMTHI Client UUID */ extern const uuid_le mei_amthi_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 File descriptors/handles * that can be opened to the driver. * * Limit to 253: 255 Total Clients * minus internal client for AMTHI * minus internal client for Watchdog */ #define MEI_MAX_OPEN_HANDLE_COUNT 253 /* * Number of Maximum MEI Clients */ #define MEI_CLIENTS_MAX 255 /* 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_states { MEI_INITIALIZING = 0, MEI_INIT_CLIENTS, MEI_ENABLED, MEI_RESETING, MEI_DISABLED, MEI_RECOVERING_FROM_RESET, MEI_POWER_DOWN, MEI_POWER_UP }; /* 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 }; /* MEI CB */ enum mei_cb_major_types { MEI_READ = 0, MEI_WRITE, MEI_IOCTL, MEI_OPEN, MEI_CLOSE }; /* * Intel MEI message data struct */ struct mei_message_data { u32 size; char *data; } __packed; struct mei_cl_cb { struct list_head cb_list; enum mei_cb_major_types major_file_operations; void *file_private; struct mei_message_data request_buffer; struct mei_message_data response_buffer; unsigned long information; 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 read_pending; 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_io_list { struct mei_cl_cb mei_cb; }; /* MEI private device struct */ struct mei_device { struct pci_dev *pdev; /* pointer to pci device struct */ /* * lists of queues */ /* array of pointers to aio lists */ struct mei_io_list read_list; /* driver read queue */ struct mei_io_list write_list; /* driver write queue */ struct mei_io_list write_waiting_list; /* write waiting queue */ struct mei_io_list ctrl_wr_list; /* managed write IOCTL list */ struct mei_io_list ctrl_rd_list; /* managed read IOCTL list */ struct mei_io_list amthi_cmd_list; /* amthi list for cmd waiting */ /* driver managed amthi list for reading completed amthi cmd data */ struct mei_io_list amthi_read_complete_list; /* * list of files */ struct list_head file_list; long open_handle_count; /* * memory of device */ unsigned int mem_base; unsigned int mem_length; void __iomem *mem_addr; /* * lock for the device */ struct mutex device_lock; /* device lock */ struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */ bool recvd_msg; /* * hw states of host and fw(ME) */ u32 host_hw_state; u32 me_hw_state; /* * 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_states mei_state; enum mei_init_clients_states init_clients_state; u16 init_clients_timer; bool stop; bool need_reset; u32 extra_write_index; u32 rd_msg_buf[128]; /* used for control messages */ u32 wr_msg_buf[128]; /* used for control messages */ u32 ext_msg_buf[8]; /* for control responses */ u32 rd_msg_hdr; 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; bool wd_pending; bool wd_stopped; bool wd_bypass; /* if false, don't refresh watchdog ME client */ u16 wd_timeout; /* seconds ((wd_data[1] << 8) + wd_data[0]) */ u16 wd_due_counter; unsigned char wd_data[MEI_START_WD_DATA_SIZE]; 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; bool wd_interface_reg; }; /* * mei init function prototypes */ struct mei_device *mei_device_init(struct pci_dev *pdev); void mei_reset(struct mei_device *dev, int interrupts); int mei_hw_init(struct mei_device *dev); int mei_task_initialize_clients(void *data); int mei_initialize_clients(struct mei_device *dev); int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl); void mei_remove_client_from_file_list(struct mei_device *dev, u8 host_client_id); void mei_host_init_iamthif(struct mei_device *dev); void mei_allocate_me_clients_storage(struct mei_device *dev); u8 mei_find_me_client_update_filext(struct mei_device *dev, struct mei_cl *priv, const uuid_le *cguid, u8 client_id); /* * MEI IO List Functions */ void mei_io_list_init(struct mei_io_list *list); void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl); /* * MEI ME Client Functions */ struct mei_cl *mei_cl_allocate(struct mei_device *dev); void mei_cl_init(struct mei_cl *cl, struct mei_device *dev); int mei_cl_flush_queues(struct mei_cl *cl); /** * mei_cl_cmp_id - tells if file private data have same id * * @fe1: private data of 1. file object * @fe2: private data of 2. file object * * returns true - if ids are the same and not NULL */ static inline bool mei_cl_cmp_id(const struct mei_cl *cl1, const struct mei_cl *cl2) { return cl1 && cl2 && (cl1->host_client_id == cl2->host_client_id) && (cl1->me_client_id == cl2->me_client_id); } /* * MEI Host Client Functions */ void mei_host_start_message(struct mei_device *dev); void mei_host_enum_clients_message(struct mei_device *dev); int mei_host_client_properties(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); /* * MEI input output function prototype */ int mei_ioctl_connect_client(struct file *file, struct mei_connect_client_data *data); int mei_start_read(struct mei_device *dev, struct mei_cl *cl); int amthi_write(struct mei_device *dev, struct mei_cl_cb *priv_cb); int amthi_read(struct mei_device *dev, struct file *file, char __user *ubuf, size_t length, loff_t *offset); struct mei_cl_cb *find_amthi_read_list_entry(struct mei_device *dev, struct file *file); void mei_run_next_iamthif_cmd(struct mei_device *dev); void mei_free_cb_private(struct mei_cl_cb *priv_cb); int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid); /* * Register Access Function */ /** * mei_reg_read - Reads 32bit data from the mei device * * @dev: the device structure * @offset: offset from which to read the data * * returns register value (u32) */ static inline u32 mei_reg_read(struct mei_device *dev, unsigned long offset) { return ioread32(dev->mem_addr + offset); } /** * mei_reg_write - Writes 32bit data to the mei device * * @dev: the device structure * @offset: offset from which to write the data * @value: register value to write (u32) */ static inline void mei_reg_write(struct mei_device *dev, unsigned long offset, u32 value) { iowrite32(value, dev->mem_addr + offset); } /** * mei_hcsr_read - Reads 32bit data from the host CSR * * @dev: the device structure * * returns the byte read. */ static inline u32 mei_hcsr_read(struct mei_device *dev) { return mei_reg_read(dev, H_CSR); } /** * mei_mecsr_read - Reads 32bit data from the ME CSR * * @dev: the device structure * * returns ME_CSR_HA register value (u32) */ static inline u32 mei_mecsr_read(struct mei_device *dev) { return mei_reg_read(dev, ME_CSR_HA); } /** * get_me_cb_rw - Reads 32bit data from the mei ME_CB_RW register * * @dev: the device structure * * returns ME_CB_RW register value (u32) */ static inline u32 mei_mecbrw_read(struct mei_device *dev) { return mei_reg_read(dev, ME_CB_RW); } /* * mei interface function prototypes */ void mei_hcsr_set(struct mei_device *dev); void mei_csr_clear_his(struct mei_device *dev); void mei_enable_interrupts(struct mei_device *dev); void mei_disable_interrupts(struct mei_device *dev); #endif