/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2003-2019, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#ifndef _MEI_DEV_H_
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#define _MEI_DEV_H_
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#include <linux/types.h>
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#include <linux/cdev.h>
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#include <linux/poll.h>
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#include <linux/mei.h>
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#include <linux/mei_cl_bus.h>
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#include "hw.h"
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#include "hbm.h"
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#define MEI_SLOT_SIZE sizeof(u32)
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#define MEI_RD_MSG_BUF_SIZE (128 * MEI_SLOT_SIZE)
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/*
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* Number of Maximum MEI Clients
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*/
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#define MEI_CLIENTS_MAX 256
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/*
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* maximum number of consecutive resets
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*/
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#define MEI_MAX_CONSEC_RESET 3
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/*
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* Number of File descriptors/handles
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* that can be opened to the driver.
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*
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* Limit to 255: 256 Total Clients
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* minus internal client for MEI Bus Messages
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*/
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#define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
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/* File state */
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enum file_state {
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MEI_FILE_UNINITIALIZED = 0,
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MEI_FILE_INITIALIZING,
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MEI_FILE_CONNECTING,
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MEI_FILE_CONNECTED,
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MEI_FILE_DISCONNECTING,
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MEI_FILE_DISCONNECT_REPLY,
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MEI_FILE_DISCONNECT_REQUIRED,
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MEI_FILE_DISCONNECTED,
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};
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/* MEI device states */
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enum mei_dev_state {
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MEI_DEV_INITIALIZING = 0,
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MEI_DEV_INIT_CLIENTS,
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MEI_DEV_ENABLED,
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MEI_DEV_RESETTING,
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MEI_DEV_DISABLED,
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MEI_DEV_POWER_DOWN,
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MEI_DEV_POWER_UP
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};
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const char *mei_dev_state_str(int state);
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enum mei_file_transaction_states {
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MEI_IDLE,
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MEI_WRITING,
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MEI_WRITE_COMPLETE,
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};
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/**
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* enum mei_cb_file_ops - file operation associated with the callback
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* @MEI_FOP_READ: read
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* @MEI_FOP_WRITE: write
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* @MEI_FOP_CONNECT: connect
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* @MEI_FOP_DISCONNECT: disconnect
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* @MEI_FOP_DISCONNECT_RSP: disconnect response
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* @MEI_FOP_NOTIFY_START: start notification
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* @MEI_FOP_NOTIFY_STOP: stop notification
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*/
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enum mei_cb_file_ops {
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MEI_FOP_READ = 0,
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MEI_FOP_WRITE,
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MEI_FOP_CONNECT,
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MEI_FOP_DISCONNECT,
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MEI_FOP_DISCONNECT_RSP,
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MEI_FOP_NOTIFY_START,
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MEI_FOP_NOTIFY_STOP,
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};
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/**
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* enum mei_cl_io_mode - io mode between driver and fw
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*
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* @MEI_CL_IO_TX_BLOCKING: send is blocking
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* @MEI_CL_IO_TX_INTERNAL: internal communication between driver and FW
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*
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* @MEI_CL_IO_RX_NONBLOCK: recv is non-blocking
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*/
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enum mei_cl_io_mode {
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MEI_CL_IO_TX_BLOCKING = BIT(0),
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MEI_CL_IO_TX_INTERNAL = BIT(1),
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MEI_CL_IO_RX_NONBLOCK = BIT(2),
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};
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/*
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* Intel MEI message data struct
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*/
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struct mei_msg_data {
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size_t size;
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unsigned char *data;
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};
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/**
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* struct mei_dma_dscr - dma address descriptor
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*
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* @vaddr: dma buffer virtual address
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* @daddr: dma buffer physical address
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* @size : dma buffer size
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*/
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struct mei_dma_dscr {
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void *vaddr;
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dma_addr_t daddr;
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size_t size;
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};
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/* Maximum number of processed FW status registers */
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#define MEI_FW_STATUS_MAX 6
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/* Minimal buffer for FW status string (8 bytes in dw + space or '\0') */
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#define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1))
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/*
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* struct mei_fw_status - storage of FW status data
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*
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* @count: number of actually available elements in array
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* @status: FW status registers
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*/
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struct mei_fw_status {
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int count;
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u32 status[MEI_FW_STATUS_MAX];
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};
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/**
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* struct mei_me_client - representation of me (fw) client
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*
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* @list: link in me client list
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* @refcnt: struct reference count
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* @props: client properties
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* @client_id: me client id
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* @tx_flow_ctrl_creds: flow control credits
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* @connect_count: number connections to this client
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* @bus_added: added to bus
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*/
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struct mei_me_client {
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struct list_head list;
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struct kref refcnt;
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struct mei_client_properties props;
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u8 client_id;
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u8 tx_flow_ctrl_creds;
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u8 connect_count;
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u8 bus_added;
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};
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struct mei_cl;
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/**
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* struct mei_cl_cb - file operation callback structure
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*
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* @list: link in callback queue
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* @cl: file client who is running this operation
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* @fop_type: file operation type
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* @buf: buffer for data associated with the callback
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* @buf_idx: last read index
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* @vtag: virtual tag
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* @fp: pointer to file structure
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* @status: io status of the cb
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* @internal: communication between driver and FW flag
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* @blocking: transmission blocking mode
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*/
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struct mei_cl_cb {
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struct list_head list;
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struct mei_cl *cl;
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enum mei_cb_file_ops fop_type;
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struct mei_msg_data buf;
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size_t buf_idx;
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u8 vtag;
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const struct file *fp;
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int status;
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u32 internal:1;
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u32 blocking:1;
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};
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/**
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* struct mei_cl_vtag - file pointer to vtag mapping structure
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*
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* @list: link in map queue
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* @fp: file pointer
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* @vtag: corresponding vtag
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* @pending_read: the read is pending on this file
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*/
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struct mei_cl_vtag {
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struct list_head list;
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const struct file *fp;
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u8 vtag;
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u8 pending_read:1;
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};
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/**
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* struct mei_cl - me client host representation
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* carried in file->private_data
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*
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* @link: link in the clients list
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* @dev: mei parent device
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* @state: file operation state
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* @tx_wait: wait queue for tx completion
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* @rx_wait: wait queue for rx completion
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* @wait: wait queue for management operation
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* @ev_wait: notification wait queue
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* @ev_async: event async notification
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* @status: connection status
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* @me_cl: fw client connected
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* @fp: file associated with client
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* @host_client_id: host id
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* @vtag_map: vtag map
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* @tx_flow_ctrl_creds: transmit flow credentials
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* @rx_flow_ctrl_creds: receive flow credentials
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* @timer_count: watchdog timer for operation completion
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* @notify_en: notification - enabled/disabled
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* @notify_ev: pending notification event
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* @tx_cb_queued: number of tx callbacks in queue
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* @writing_state: state of the tx
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* @rd_pending: pending read credits
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* @rd_completed_lock: protects rd_completed queue
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* @rd_completed: completed read
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*
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* @cldev: device on the mei client bus
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*/
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struct mei_cl {
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struct list_head link;
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struct mei_device *dev;
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enum file_state state;
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wait_queue_head_t tx_wait;
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wait_queue_head_t rx_wait;
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wait_queue_head_t wait;
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wait_queue_head_t ev_wait;
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struct fasync_struct *ev_async;
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int status;
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struct mei_me_client *me_cl;
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const struct file *fp;
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u8 host_client_id;
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struct list_head vtag_map;
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u8 tx_flow_ctrl_creds;
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u8 rx_flow_ctrl_creds;
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u8 timer_count;
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u8 notify_en;
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u8 notify_ev;
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u8 tx_cb_queued;
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enum mei_file_transaction_states writing_state;
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struct list_head rd_pending;
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spinlock_t rd_completed_lock; /* protects rd_completed queue */
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struct list_head rd_completed;
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struct mei_cl_device *cldev;
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};
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#define MEI_TX_QUEUE_LIMIT_DEFAULT 50
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#define MEI_TX_QUEUE_LIMIT_MAX 255
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#define MEI_TX_QUEUE_LIMIT_MIN 30
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/**
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* struct mei_hw_ops - hw specific ops
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*
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* @host_is_ready : query for host readiness
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*
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* @hw_is_ready : query if hw is ready
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* @hw_reset : reset hw
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* @hw_start : start hw after reset
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* @hw_config : configure hw
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*
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* @fw_status : get fw status registers
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* @trc_status : get trc status register
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* @pg_state : power gating state of the device
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* @pg_in_transition : is device now in pg transition
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* @pg_is_enabled : is power gating enabled
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*
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* @intr_clear : clear pending interrupts
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* @intr_enable : enable interrupts
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* @intr_disable : disable interrupts
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* @synchronize_irq : synchronize irqs
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*
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* @hbuf_free_slots : query for write buffer empty slots
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* @hbuf_is_ready : query if write buffer is empty
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* @hbuf_depth : query for write buffer depth
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*
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* @write : write a message to FW
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*
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* @rdbuf_full_slots : query how many slots are filled
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*
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* @read_hdr : get first 4 bytes (header)
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* @read : read a buffer from the FW
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*/
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struct mei_hw_ops {
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bool (*host_is_ready)(struct mei_device *dev);
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bool (*hw_is_ready)(struct mei_device *dev);
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int (*hw_reset)(struct mei_device *dev, bool enable);
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int (*hw_start)(struct mei_device *dev);
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int (*hw_config)(struct mei_device *dev);
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int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts);
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int (*trc_status)(struct mei_device *dev, u32 *trc);
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enum mei_pg_state (*pg_state)(struct mei_device *dev);
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bool (*pg_in_transition)(struct mei_device *dev);
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bool (*pg_is_enabled)(struct mei_device *dev);
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void (*intr_clear)(struct mei_device *dev);
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void (*intr_enable)(struct mei_device *dev);
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void (*intr_disable)(struct mei_device *dev);
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void (*synchronize_irq)(struct mei_device *dev);
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int (*hbuf_free_slots)(struct mei_device *dev);
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bool (*hbuf_is_ready)(struct mei_device *dev);
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u32 (*hbuf_depth)(const struct mei_device *dev);
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int (*write)(struct mei_device *dev,
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const void *hdr, size_t hdr_len,
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const void *data, size_t data_len);
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int (*rdbuf_full_slots)(struct mei_device *dev);
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u32 (*read_hdr)(const struct mei_device *dev);
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int (*read)(struct mei_device *dev,
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unsigned char *buf, unsigned long len);
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};
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/* MEI bus API*/
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void mei_cl_bus_rescan_work(struct work_struct *work);
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void mei_cl_bus_dev_fixup(struct mei_cl_device *dev);
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ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length,
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unsigned int mode);
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ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length,
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unsigned int mode, unsigned long timeout);
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bool mei_cl_bus_rx_event(struct mei_cl *cl);
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bool mei_cl_bus_notify_event(struct mei_cl *cl);
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void mei_cl_bus_remove_devices(struct mei_device *bus);
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int mei_cl_bus_init(void);
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void mei_cl_bus_exit(void);
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/**
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* enum mei_pg_event - power gating transition events
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*
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* @MEI_PG_EVENT_IDLE: the driver is not in power gating transition
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* @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete
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* @MEI_PG_EVENT_RECEIVED: the driver received pg event
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* @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt
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* @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt
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*/
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enum mei_pg_event {
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MEI_PG_EVENT_IDLE,
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MEI_PG_EVENT_WAIT,
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MEI_PG_EVENT_RECEIVED,
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MEI_PG_EVENT_INTR_WAIT,
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MEI_PG_EVENT_INTR_RECEIVED,
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};
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/**
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* enum mei_pg_state - device internal power gating state
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*
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* @MEI_PG_OFF: device is not power gated - it is active
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* @MEI_PG_ON: device is power gated - it is in lower power state
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*/
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enum mei_pg_state {
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MEI_PG_OFF = 0,
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MEI_PG_ON = 1,
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};
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const char *mei_pg_state_str(enum mei_pg_state state);
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/**
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* struct mei_fw_version - MEI FW version struct
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*
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* @platform: platform identifier
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* @major: major version field
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* @minor: minor version field
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* @buildno: build number version field
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* @hotfix: hotfix number version field
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*/
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struct mei_fw_version {
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u8 platform;
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u8 major;
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u16 minor;
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u16 buildno;
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u16 hotfix;
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};
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#define MEI_MAX_FW_VER_BLOCKS 3
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/**
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* struct mei_device - MEI private device struct
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*
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* @dev : device on a bus
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* @cdev : character device
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* @minor : minor number allocated for device
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*
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* @write_list : write pending list
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* @write_waiting_list : write completion list
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* @ctrl_wr_list : pending control write list
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* @ctrl_rd_list : pending control read list
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* @tx_queue_limit: tx queues per client linit
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*
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* @file_list : list of opened handles
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* @open_handle_count: number of opened handles
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*
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* @device_lock : big device lock
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* @timer_work : MEI timer delayed work (timeouts)
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*
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* @recvd_hw_ready : hw ready message received flag
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*
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* @wait_hw_ready : wait queue for receive HW ready message form FW
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* @wait_pg : wait queue for receive PG message from FW
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* @wait_hbm_start : wait queue for receive HBM start message from FW
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*
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* @reset_count : number of consecutive resets
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* @dev_state : device state
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* @hbm_state : state of host bus message protocol
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* @init_clients_timer : HBM init handshake timeout
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*
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* @pg_event : power gating event
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* @pg_domain : runtime PM domain
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*
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* @rd_msg_buf : control messages buffer
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* @rd_msg_hdr : read message header storage
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* @rd_msg_hdr_count : how many dwords were already read from header
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*
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* @hbuf_is_ready : query if the host host/write buffer is ready
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* @dr_dscr: DMA ring descriptors: TX, RX, and CTRL
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*
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* @version : HBM protocol version in use
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* @hbm_f_pg_supported : hbm feature pgi protocol
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* @hbm_f_dc_supported : hbm feature dynamic clients
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* @hbm_f_dot_supported : hbm feature disconnect on timeout
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* @hbm_f_ev_supported : hbm feature event notification
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* @hbm_f_fa_supported : hbm feature fixed address client
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* @hbm_f_ie_supported : hbm feature immediate reply to enum request
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* @hbm_f_os_supported : hbm feature support OS ver message
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* @hbm_f_dr_supported : hbm feature dma ring supported
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* @hbm_f_vt_supported : hbm feature vtag supported
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* @hbm_f_cap_supported : hbm feature capabilities message supported
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*
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* @fw_ver : FW versions
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*
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* @fw_f_fw_ver_supported : fw feature: fw version supported
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*
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* @me_clients_rwsem: rw lock over me_clients list
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* @me_clients : list of FW clients
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* @me_clients_map : FW clients bit map
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* @host_clients_map : host clients id pool
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*
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* @allow_fixed_address: allow user space to connect a fixed client
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* @override_fixed_address: force allow fixed address behavior
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*
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* @reset_work : work item for the device reset
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* @bus_rescan_work : work item for the bus rescan
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*
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* @device_list : mei client bus list
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* @cl_bus_lock : client bus list lock
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*
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* @kind : kind of mei device
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*
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* @dbgfs_dir : debugfs mei root directory
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*
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* @ops: : hw specific operations
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* @hw : hw specific data
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*/
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struct mei_device {
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struct device *dev;
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struct cdev cdev;
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int minor;
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struct list_head write_list;
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struct list_head write_waiting_list;
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struct list_head ctrl_wr_list;
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struct list_head ctrl_rd_list;
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u8 tx_queue_limit;
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struct list_head file_list;
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long open_handle_count;
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struct mutex device_lock;
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struct delayed_work timer_work;
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bool recvd_hw_ready;
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/*
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* waiting queue for receive message from FW
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*/
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wait_queue_head_t wait_hw_ready;
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wait_queue_head_t wait_pg;
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wait_queue_head_t wait_hbm_start;
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/*
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* mei device states
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*/
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unsigned long reset_count;
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enum mei_dev_state dev_state;
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enum mei_hbm_state hbm_state;
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u16 init_clients_timer;
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/*
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* Power Gating support
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*/
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enum mei_pg_event pg_event;
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#ifdef CONFIG_PM
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struct dev_pm_domain pg_domain;
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#endif /* CONFIG_PM */
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unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
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u32 rd_msg_hdr[MEI_RD_MSG_BUF_SIZE];
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int rd_msg_hdr_count;
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/* write buffer */
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bool hbuf_is_ready;
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struct mei_dma_dscr dr_dscr[DMA_DSCR_NUM];
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struct hbm_version version;
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unsigned int hbm_f_pg_supported:1;
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unsigned int hbm_f_dc_supported:1;
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unsigned int hbm_f_dot_supported:1;
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unsigned int hbm_f_ev_supported:1;
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unsigned int hbm_f_fa_supported:1;
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unsigned int hbm_f_ie_supported:1;
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unsigned int hbm_f_os_supported:1;
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unsigned int hbm_f_dr_supported:1;
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unsigned int hbm_f_vt_supported:1;
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unsigned int hbm_f_cap_supported:1;
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struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];
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unsigned int fw_f_fw_ver_supported:1;
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struct rw_semaphore me_clients_rwsem;
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struct list_head me_clients;
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DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
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DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
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bool allow_fixed_address;
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bool override_fixed_address;
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struct work_struct reset_work;
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struct work_struct bus_rescan_work;
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/* List of bus devices */
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struct list_head device_list;
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struct mutex cl_bus_lock;
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const char *kind;
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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struct dentry *dbgfs_dir;
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#endif /* CONFIG_DEBUG_FS */
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const struct mei_hw_ops *ops;
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char hw[] __aligned(sizeof(void *));
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};
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static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
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{
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return msecs_to_jiffies(sec * MSEC_PER_SEC);
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}
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/**
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* mei_data2slots - get slots number from a message length
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*
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* @length: size of the messages in bytes
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*
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* Return: number of slots
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*/
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static inline u32 mei_data2slots(size_t length)
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{
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return DIV_ROUND_UP(length, MEI_SLOT_SIZE);
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}
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/**
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* mei_hbm2slots - get slots number from a hbm message length
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* length + size of the mei message header
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*
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* @length: size of the messages in bytes
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*
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* Return: number of slots
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*/
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static inline u32 mei_hbm2slots(size_t length)
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{
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return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, MEI_SLOT_SIZE);
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}
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/**
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* mei_slots2data - get data in slots - bytes from slots
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*
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* @slots: number of available slots
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*
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* Return: number of bytes in slots
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*/
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static inline u32 mei_slots2data(int slots)
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{
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return slots * MEI_SLOT_SIZE;
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}
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/*
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* mei init function prototypes
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*/
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void mei_device_init(struct mei_device *dev,
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struct device *device,
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const struct mei_hw_ops *hw_ops);
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int mei_reset(struct mei_device *dev);
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int mei_start(struct mei_device *dev);
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int mei_restart(struct mei_device *dev);
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void mei_stop(struct mei_device *dev);
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void mei_cancel_work(struct mei_device *dev);
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void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state);
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int mei_dmam_ring_alloc(struct mei_device *dev);
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void mei_dmam_ring_free(struct mei_device *dev);
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bool mei_dma_ring_is_allocated(struct mei_device *dev);
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void mei_dma_ring_reset(struct mei_device *dev);
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void mei_dma_ring_read(struct mei_device *dev, unsigned char *buf, u32 len);
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void mei_dma_ring_write(struct mei_device *dev, unsigned char *buf, u32 len);
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u32 mei_dma_ring_empty_slots(struct mei_device *dev);
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/*
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* MEI interrupt functions prototype
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*/
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void mei_timer(struct work_struct *work);
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void mei_schedule_stall_timer(struct mei_device *dev);
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int mei_irq_read_handler(struct mei_device *dev,
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struct list_head *cmpl_list, s32 *slots);
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int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list);
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void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list);
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/*
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* Register Access Function
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*/
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|
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static inline int mei_hw_config(struct mei_device *dev)
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{
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return dev->ops->hw_config(dev);
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}
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static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
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{
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return dev->ops->pg_state(dev);
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}
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static inline bool mei_pg_in_transition(struct mei_device *dev)
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{
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return dev->ops->pg_in_transition(dev);
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}
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static inline bool mei_pg_is_enabled(struct mei_device *dev)
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{
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return dev->ops->pg_is_enabled(dev);
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}
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static inline int mei_hw_reset(struct mei_device *dev, bool enable)
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{
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return dev->ops->hw_reset(dev, enable);
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}
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static inline int mei_hw_start(struct mei_device *dev)
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{
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return dev->ops->hw_start(dev);
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}
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static inline void mei_clear_interrupts(struct mei_device *dev)
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{
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dev->ops->intr_clear(dev);
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}
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static inline void mei_enable_interrupts(struct mei_device *dev)
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{
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dev->ops->intr_enable(dev);
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}
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static inline void mei_disable_interrupts(struct mei_device *dev)
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{
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dev->ops->intr_disable(dev);
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}
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static inline void mei_synchronize_irq(struct mei_device *dev)
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{
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dev->ops->synchronize_irq(dev);
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}
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static inline bool mei_host_is_ready(struct mei_device *dev)
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{
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return dev->ops->host_is_ready(dev);
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}
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static inline bool mei_hw_is_ready(struct mei_device *dev)
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{
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return dev->ops->hw_is_ready(dev);
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}
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static inline bool mei_hbuf_is_ready(struct mei_device *dev)
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{
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return dev->ops->hbuf_is_ready(dev);
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}
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static inline int mei_hbuf_empty_slots(struct mei_device *dev)
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{
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return dev->ops->hbuf_free_slots(dev);
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}
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static inline u32 mei_hbuf_depth(const struct mei_device *dev)
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{
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return dev->ops->hbuf_depth(dev);
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}
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static inline int mei_write_message(struct mei_device *dev,
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const void *hdr, size_t hdr_len,
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const void *data, size_t data_len)
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{
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return dev->ops->write(dev, hdr, hdr_len, data, data_len);
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}
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static inline u32 mei_read_hdr(const struct mei_device *dev)
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{
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return dev->ops->read_hdr(dev);
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}
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static inline void mei_read_slots(struct mei_device *dev,
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unsigned char *buf, unsigned long len)
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{
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dev->ops->read(dev, buf, len);
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}
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static inline int mei_count_full_read_slots(struct mei_device *dev)
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{
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return dev->ops->rdbuf_full_slots(dev);
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}
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static inline int mei_trc_status(struct mei_device *dev, u32 *trc)
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{
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if (dev->ops->trc_status)
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return dev->ops->trc_status(dev, trc);
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return -EOPNOTSUPP;
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}
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static inline int mei_fw_status(struct mei_device *dev,
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struct mei_fw_status *fw_status)
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{
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return dev->ops->fw_status(dev, fw_status);
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}
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bool mei_hbuf_acquire(struct mei_device *dev);
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bool mei_write_is_idle(struct mei_device *dev);
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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void mei_dbgfs_register(struct mei_device *dev, const char *name);
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void mei_dbgfs_deregister(struct mei_device *dev);
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#else
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static inline void mei_dbgfs_register(struct mei_device *dev, const char *name) {}
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static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
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#endif /* CONFIG_DEBUG_FS */
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int mei_register(struct mei_device *dev, struct device *parent);
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void mei_deregister(struct mei_device *dev);
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#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d dma=%1d ext=%1d internal=%1d comp=%1d"
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#define MEI_HDR_PRM(hdr) \
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(hdr)->host_addr, (hdr)->me_addr, \
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(hdr)->length, (hdr)->dma_ring, (hdr)->extended, \
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(hdr)->internal, (hdr)->msg_complete
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|
ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
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/**
|
* 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;
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|
buf[0] = '\0';
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|
ret = mei_fw_status(dev, &fw_status);
|
if (ret)
|
return ret;
|
|
ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ);
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|
return ret;
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}
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|
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#endif
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