3 * Intel Management Engine Interface (Intel MEI) Linux driver
4 * Copyright (c) 2003-2011, Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms and conditions of the GNU General Public License,
8 * version 2, as published by the Free Software Foundation.
10 * This program is distributed in the hope it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20 #include <linux/types.h>
21 #include <linux/watchdog.h>
26 * MEI Char Driver Minors
28 #define MEI_MINORS_BASE 1
29 #define MEI_MINORS_COUNT 1
30 #define MEI_MINOR_NUMBER 1
33 * watch dog definition
35 #define MEI_WATCHDOG_DATA_SIZE 16
36 #define MEI_START_WD_DATA_SIZE 20
37 #define MEI_WD_PARAMS_SIZE 4
38 #define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0)
41 * MEI PCI Device object
43 extern struct pci_dev *mei_device;
48 #define INTEL_AMT_WATCHDOG_ID "INTCAMT"
49 extern struct watchdog_device amt_wd_dev;
54 extern const uuid_le mei_amthi_guid;
57 * Watchdog Client UUID
59 extern const uuid_le mei_wd_guid;
62 * Watchdog independence state message
64 extern const u8 mei_wd_state_independence_msg[3][4];
67 * maximum number of consecutive resets
69 #define MEI_MAX_CONSEC_RESET 3
72 * Number of File descriptors/handles
73 * that can be opened to the driver.
75 * Limit to 253: 255 Total Clients
76 * minus internal client for AMTHI
77 * minus internal client for Watchdog
79 #define MEI_MAX_OPEN_HANDLE_COUNT 253
82 * Number of Maximum MEI Clients
84 #define MEI_CLIENTS_MAX 255
88 MEI_FILE_INITIALIZING = 0,
91 MEI_FILE_DISCONNECTING,
95 /* MEI device states */
102 MEI_RECOVERING_FROM_RESET,
107 /* init clients states*/
108 enum mei_init_clients_states {
109 MEI_START_MESSAGE = 0,
110 MEI_ENUM_CLIENTS_MESSAGE,
111 MEI_CLIENT_PROPERTIES_MESSAGE
114 enum iamthif_states {
117 MEI_IAMTHIF_FLOW_CONTROL,
119 MEI_IAMTHIF_READ_COMPLETE
122 enum mei_file_transaction_states {
132 enum mei_cb_major_types {
141 * Intel MEI message data struct
143 struct mei_message_data {
150 struct list_head cb_list;
151 enum mei_cb_major_types major_file_operations;
153 struct mei_message_data request_buffer;
154 struct mei_message_data response_buffer;
155 unsigned long information;
156 unsigned long read_time;
157 struct file *file_object;
160 /* MEI client instance carried as file->pirvate_data*/
162 struct list_head link;
163 struct mei_device *dev;
164 enum file_state state;
165 wait_queue_head_t tx_wait;
166 wait_queue_head_t rx_wait;
167 wait_queue_head_t wait;
170 /* ID of client connected */
173 u8 mei_flow_ctrl_creds;
175 enum mei_file_transaction_states reading_state;
176 enum mei_file_transaction_states writing_state;
178 struct mei_cl_cb *read_cb;
182 struct mei_cl_cb mei_cb;
187 * mei_device - MEI private device struct
189 * @reset_count - limits the number of consecutive resets
192 struct pci_dev *pdev; /* pointer to pci device struct */
196 /* array of pointers to aio lists */
197 struct mei_io_list read_list; /* driver read queue */
198 struct mei_io_list write_list; /* driver write queue */
199 struct mei_io_list write_waiting_list; /* write waiting queue */
200 struct mei_io_list ctrl_wr_list; /* managed write IOCTL list */
201 struct mei_io_list ctrl_rd_list; /* managed read IOCTL list */
202 struct mei_io_list amthi_cmd_list; /* amthi list for cmd waiting */
204 /* driver managed amthi list for reading completed amthi cmd data */
205 struct mei_io_list amthi_read_complete_list;
209 struct list_head file_list;
210 long open_handle_count;
214 unsigned int mem_base;
215 unsigned int mem_length;
216 void __iomem *mem_addr;
218 * lock for the device
220 struct mutex device_lock; /* device lock */
221 struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
224 * hw states of host and fw(ME)
229 * waiting queue for receive message from FW
231 wait_queue_head_t wait_recvd_msg;
232 wait_queue_head_t wait_stop_wd;
237 unsigned long reset_count;
238 enum mei_states mei_state;
239 enum mei_init_clients_states init_clients_state;
240 u16 init_clients_timer;
244 u32 extra_write_index;
245 u32 rd_msg_buf[128]; /* used for control messages */
246 u32 wr_msg_buf[128]; /* used for control messages */
247 u32 ext_msg_buf[8]; /* for control responses */
250 struct hbm_version version;
252 struct mei_me_client *me_clients; /* Note: memory has to be allocated */
253 DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
254 DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
256 u8 me_client_presentation_num;
258 bool mei_host_buffer_is_empty;
263 bool wd_bypass; /* if false, don't refresh watchdog ME client */
264 u16 wd_timeout; /* seconds ((wd_data[1] << 8) + wd_data[0]) */
266 unsigned char wd_data[MEI_START_WD_DATA_SIZE];
270 struct file *iamthif_file_object;
271 struct mei_cl iamthif_cl;
272 struct mei_cl_cb *iamthif_current_cb;
274 unsigned long iamthif_timer;
275 u32 iamthif_stall_timer;
276 unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
277 u32 iamthif_msg_buf_size;
278 u32 iamthif_msg_buf_index;
279 enum iamthif_states iamthif_state;
280 bool iamthif_flow_control_pending;
282 bool iamthif_canceled;
284 bool wd_interface_reg;
289 * mei init function prototypes
291 struct mei_device *mei_device_init(struct pci_dev *pdev);
292 void mei_reset(struct mei_device *dev, int interrupts);
293 int mei_hw_init(struct mei_device *dev);
294 int mei_task_initialize_clients(void *data);
295 int mei_initialize_clients(struct mei_device *dev);
296 int mei_disconnect_host_client(struct mei_device *dev, struct mei_cl *cl);
297 void mei_remove_client_from_file_list(struct mei_device *dev, u8 host_client_id);
298 void mei_host_init_iamthif(struct mei_device *dev);
299 void mei_allocate_me_clients_storage(struct mei_device *dev);
302 u8 mei_find_me_client_update_filext(struct mei_device *dev,
304 const uuid_le *cguid, u8 client_id);
307 * MEI IO List Functions
309 void mei_io_list_init(struct mei_io_list *list);
310 void mei_io_list_flush(struct mei_io_list *list, struct mei_cl *cl);
313 * MEI ME Client Functions
316 struct mei_cl *mei_cl_allocate(struct mei_device *dev);
317 void mei_cl_init(struct mei_cl *cl, struct mei_device *dev);
318 int mei_cl_flush_queues(struct mei_cl *cl);
320 * mei_cl_cmp_id - tells if file private data have same id
322 * @fe1: private data of 1. file object
323 * @fe2: private data of 2. file object
325 * returns true - if ids are the same and not NULL
327 static inline bool mei_cl_cmp_id(const struct mei_cl *cl1,
328 const struct mei_cl *cl2)
331 (cl1->host_client_id == cl2->host_client_id) &&
332 (cl1->me_client_id == cl2->me_client_id);
338 * MEI Host Client Functions
340 void mei_host_start_message(struct mei_device *dev);
341 void mei_host_enum_clients_message(struct mei_device *dev);
342 int mei_host_client_properties(struct mei_device *dev);
345 * MEI interrupt functions prototype
347 irqreturn_t mei_interrupt_quick_handler(int irq, void *dev_id);
348 irqreturn_t mei_interrupt_thread_handler(int irq, void *dev_id);
349 void mei_timer(struct work_struct *work);
352 * MEI input output function prototype
354 int mei_ioctl_connect_client(struct file *file,
355 struct mei_connect_client_data *data);
357 int mei_start_read(struct mei_device *dev, struct mei_cl *cl);
359 int amthi_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
361 int amthi_read(struct mei_device *dev, struct file *file,
362 char __user *ubuf, size_t length, loff_t *offset);
364 struct mei_cl_cb *find_amthi_read_list_entry(struct mei_device *dev,
367 void mei_run_next_iamthif_cmd(struct mei_device *dev);
369 void mei_free_cb_private(struct mei_cl_cb *priv_cb);
371 int mei_find_me_client_index(const struct mei_device *dev, uuid_le cuuid);
374 * Register Access Function
378 * mei_reg_read - Reads 32bit data from the mei device
380 * @dev: the device structure
381 * @offset: offset from which to read the data
383 * returns register value (u32)
385 static inline u32 mei_reg_read(struct mei_device *dev, unsigned long offset)
387 return ioread32(dev->mem_addr + offset);
391 * mei_reg_write - Writes 32bit data to the mei device
393 * @dev: the device structure
394 * @offset: offset from which to write the data
395 * @value: register value to write (u32)
397 static inline void mei_reg_write(struct mei_device *dev,
398 unsigned long offset, u32 value)
400 iowrite32(value, dev->mem_addr + offset);
404 * mei_hcsr_read - Reads 32bit data from the host CSR
406 * @dev: the device structure
408 * returns the byte read.
410 static inline u32 mei_hcsr_read(struct mei_device *dev)
412 return mei_reg_read(dev, H_CSR);
416 * mei_mecsr_read - Reads 32bit data from the ME CSR
418 * @dev: the device structure
420 * returns ME_CSR_HA register value (u32)
422 static inline u32 mei_mecsr_read(struct mei_device *dev)
424 return mei_reg_read(dev, ME_CSR_HA);
428 * get_me_cb_rw - Reads 32bit data from the mei ME_CB_RW register
430 * @dev: the device structure
432 * returns ME_CB_RW register value (u32)
434 static inline u32 mei_mecbrw_read(struct mei_device *dev)
436 return mei_reg_read(dev, ME_CB_RW);
441 * mei interface function prototypes
443 void mei_hcsr_set(struct mei_device *dev);
444 void mei_csr_clear_his(struct mei_device *dev);
446 void mei_enable_interrupts(struct mei_device *dev);
447 void mei_disable_interrupts(struct mei_device *dev);