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33ec082631
linux-next/drivers/misc/mei/mei_dev.h
Tomas Winkler 33ec082631 mei: revamp mei reset state machine 
1. MEI_DEV_RESETTING device state spans only hardware reset flow
while starting dev state is saved into a local variable for further
reference, this let us to reduce big if statements in case we
are trying to avoid nested resets

2. During initializations if the reset ended in MEI_DEV_DISABLED device
state we bail out with -ENODEV

3. Remove redundant interrupts_enabled parameter as this
 can be deduced from the starting dev_state

4. mei_reset propagates error code to the caller

5. Add mei_restart function to wrap the pci resume

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-13 14:57:21 -08:00

649 lines
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/*
*
* 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 <linux/mei_cl_bus.h>
#include "hw.h"
#include "hw-me-regs.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
/*
* 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_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_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_msg_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_msg_data request_buffer;
struct mei_msg_data response_buffer;
unsigned long buf_idx;
unsigned long read_time;
struct file *file_object;
u32 internal:1;
};
/* MEI client instance carried as file->private_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 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;
struct mei_cl_cb *read_cb;
/* MEI CL bus data */
struct mei_cl_device *device;
struct list_head device_link;
uuid_le device_uuid;
};
/** 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
* @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);
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);
int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
void mei_cl_bus_rx_event(struct mei_cl *cl);
int mei_cl_bus_init(void);
void mei_cl_bus_exit(void);
/**
* 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
* @uuid: me client uuid
* @cl: mei client
* @ops: ME transport ops
* @event_cb: Drivers register this callback to get asynchronous ME
* events (e.g. Rx buffer pending) notifications.
* @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;
};
/**
* struct mei_device - MEI private device struct
* @hbm_state - state of host bus message protocol
* @mem_addr - mem mapped base register address
* @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
* @wr_ext_msg - the 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;
/*
* lock for the device
*/
struct mutex device_lock; /* device lock */
struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
bool recvd_hw_ready;
/*
* waiting queue for receive message from FW
*/
wait_queue_head_t wait_hw_ready;
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_hbm_state hbm_state;
u16 init_clients_timer;
unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
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 {
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);
unsigned long me_clients_num;
unsigned long me_client_presentation_num;
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;
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;
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
* returns - 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
* returns - 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);
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_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_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
s32 *slots, 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_device *dev,
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
*/
void 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 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);
}
#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);
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
#endif
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