/*
*
* 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 <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)
#define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32))
/*
* 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;
unsigned 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;
unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* 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