/*
*
* 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 <linux/poll.h>
#include <linux/mei.h>
#include "hw.h"
#include "hw-me.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_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 Maximum MEI Clients
*/
#define MEI_CLIENTS_MAX 256
/*
* Number of File descriptors/handles
* that can be opened to the driver.
*
* Limit to 253: 256 Total Clients
* minus internal client for MEI Bus Messags
* minus internal client for AMTHI
* minus internal client for Watchdog
*/
#define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 3)
/*
* Internal Clients Number
*/
#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 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_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;
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;
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;
bool need_reset;
unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
u32 rd_msg_hdr;
u32 wr_msg_buf[128]; /* used for control messages */
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;
};
static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
{
return msecs_to_jiffies(sec * MSEC_PER_SEC);
}
/*
* 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_allocate_me_clients_storage(struct mei_device *dev);
int mei_me_cl_link(struct mei_device *dev, struct mei_cl *cl,
const uuid_le *cguid, u8 host_client_id);
void mei_me_cl_unlink(struct mei_device *dev, struct mei_cl *cl);
int mei_me_cl_by_uuid(const struct mei_device *dev, const uuid_le *cuuid);
int mei_me_cl_by_id(struct mei_device *dev, u8 client_id);
/*
* MEI IO Functions
*/
struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, struct file *fp);
void mei_io_cb_free(struct mei_cl_cb *priv_cb);
int mei_io_cb_alloc_req_buf(struct mei_cl_cb *cb, size_t length);
int mei_io_cb_alloc_resp_buf(struct mei_cl_cb *cb, size_t length);
/**
* mei_io_list_init - Sets up a queue list.
*
* @list: An instance cl callback structure
*/
static inline void mei_io_list_init(struct mei_cl_cb *list)
{
INIT_LIST_HEAD(&list->list);
}
void mei_io_list_flush(struct mei_cl_cb *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_enumerate(struct mei_device *dev);
void mei_host_client_init(struct work_struct *work);
/*
* 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);
/*
* AMTHIF - AMT Host Interface Functions
*/
void mei_amthif_reset_params(struct mei_device *dev);
void 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_read_message(struct mei_cl_cb *complete_list,
struct mei_device *dev, struct mei_msg_hdr *mei_hdr);
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);
/*
* 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(const 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(const 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(const 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(const 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(const 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);
static inline struct mei_msg_hdr *mei_hbm_hdr(u32 *buf, size_t length)
{
struct mei_msg_hdr *hdr = (struct mei_msg_hdr *)buf;
hdr->host_addr = 0;
hdr->me_addr = 0;
hdr->length = length;
hdr->msg_complete = 1;
hdr->reserved = 0;
return hdr;
}
#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
