Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 | /*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2011, 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.
*
*/
#include <linux/pci.h>
#include "mei_dev.h"
#include "mei.h"
#include "interface.h"
/**
* mei_set_csr_register - writes H_CSR register to the mei device,
* and ignores the H_IS bit for it is write-one-to-zero.
*
* @dev: the device structure
*/
void mei_hcsr_set(struct mei_device *dev)
{
if ((dev->host_hw_state & H_IS) == H_IS)
dev->host_hw_state &= ~H_IS;
mei_reg_write(dev, H_CSR, dev->host_hw_state);
dev->host_hw_state = mei_hcsr_read(dev);
}
/**
* mei_csr_enable_interrupts - enables mei device interrupts
*
* @dev: the device structure
*/
void mei_enable_interrupts(struct mei_device *dev)
{
dev->host_hw_state |= H_IE;
mei_hcsr_set(dev);
}
/**
* mei_csr_disable_interrupts - disables mei device interrupts
*
* @dev: the device structure
*/
void mei_disable_interrupts(struct mei_device *dev)
{
dev->host_hw_state &= ~H_IE;
mei_hcsr_set(dev);
}
/**
* _host_get_filled_slots - gets number of device filled buffer slots
*
* @device: the device structure
*
* returns number of filled slots
*/
static unsigned char _host_get_filled_slots(const struct mei_device *dev)
{
char read_ptr, write_ptr;
read_ptr = (char) ((dev->host_hw_state & H_CBRP) >> 8);
write_ptr = (char) ((dev->host_hw_state & H_CBWP) >> 16);
return (unsigned char) (write_ptr - read_ptr);
}
/**
* mei_host_buffer_is_empty - checks if host buffer is empty.
*
* @dev: the device structure
*
* returns 1 if empty, 0 - otherwise.
*/
int mei_host_buffer_is_empty(struct mei_device *dev)
{
unsigned char filled_slots;
dev->host_hw_state = mei_hcsr_read(dev);
filled_slots = _host_get_filled_slots(dev);
if (filled_slots == 0)
return 1;
return 0;
}
/**
* mei_count_empty_write_slots - counts write empty slots.
*
* @dev: the device structure
*
* returns -1(ESLOTS_OVERFLOW) if overflow, otherwise empty slots count
*/
int mei_count_empty_write_slots(struct mei_device *dev)
{
unsigned char buffer_depth, filled_slots, empty_slots;
dev->host_hw_state = mei_hcsr_read(dev);
buffer_depth = (unsigned char) ((dev->host_hw_state & H_CBD) >> 24);
filled_slots = _host_get_filled_slots(dev);
empty_slots = buffer_depth - filled_slots;
/* check for overflow */
if (filled_slots > buffer_depth)
return -EOVERFLOW;
return empty_slots;
}
/**
* mei_write_message - writes a message to mei device.
*
* @dev: the device structure
* @header: header of message
* @write_buffer: message buffer will be written
* @write_length: message size will be written
*
* returns 1 if success, 0 - otherwise.
*/
int mei_write_message(struct mei_device *dev,
struct mei_msg_hdr *header,
unsigned char *write_buffer,
unsigned long write_length)
{
u32 temp_msg = 0;
unsigned long bytes_written = 0;
unsigned char buffer_depth, filled_slots, empty_slots;
unsigned long dw_to_write;
dev->host_hw_state = mei_hcsr_read(dev);
dev_dbg(&dev->pdev->dev,
"host_hw_state = 0x%08x.\n",
dev->host_hw_state);
dev_dbg(&dev->pdev->dev,
"mei_write_message header=%08x.\n",
*((u32 *) header));
buffer_depth = (unsigned char) ((dev->host_hw_state & H_CBD) >> 24);
filled_slots = _host_get_filled_slots(dev);
empty_slots = buffer_depth - filled_slots;
dev_dbg(&dev->pdev->dev,
"filled = %hu, empty = %hu.\n",
filled_slots, empty_slots);
dw_to_write = ((write_length + 3) / 4);
if (dw_to_write > empty_slots)
return 0;
mei_reg_write(dev, H_CB_WW, *((u32 *) header));
while (write_length >= 4) {
mei_reg_write(dev, H_CB_WW,
*(u32 *) (write_buffer + bytes_written));
bytes_written += 4;
write_length -= 4;
}
if (write_length > 0) {
memcpy(&temp_msg, &write_buffer[bytes_written], write_length);
mei_reg_write(dev, H_CB_WW, temp_msg);
}
dev->host_hw_state |= H_IG;
mei_hcsr_set(dev);
dev->me_hw_state = mei_mecsr_read(dev);
if ((dev->me_hw_state & ME_RDY_HRA) != ME_RDY_HRA)
return 0;
dev->write_hang = 0;
return 1;
}
/**
* mei_count_full_read_slots - counts read full slots.
*
* @dev: the device structure
*
* returns -1(ESLOTS_OVERFLOW) if overflow, otherwise filled slots count
*/
int mei_count_full_read_slots(struct mei_device *dev)
{
char read_ptr, write_ptr;
unsigned char buffer_depth, filled_slots;
dev->me_hw_state = mei_mecsr_read(dev);
buffer_depth = (unsigned char)((dev->me_hw_state & ME_CBD_HRA) >> 24);
read_ptr = (char) ((dev->me_hw_state & ME_CBRP_HRA) >> 8);
write_ptr = (char) ((dev->me_hw_state & ME_CBWP_HRA) >> 16);
filled_slots = (unsigned char) (write_ptr - read_ptr);
/* check for overflow */
if (filled_slots > buffer_depth)
return -EOVERFLOW;
dev_dbg(&dev->pdev->dev, "filled_slots =%08x\n", filled_slots);
return (int)filled_slots;
}
/**
* mei_read_slots - reads a message from mei device.
*
* @dev: the device structure
* @buffer: message buffer will be written
* @buffer_length: message size will be read
*/
void mei_read_slots(struct mei_device *dev,
unsigned char *buffer, unsigned long buffer_length)
{
u32 i = 0;
unsigned char temp_buf[sizeof(u32)];
while (buffer_length >= sizeof(u32)) {
((u32 *) buffer)[i] = mei_mecbrw_read(dev);
dev_dbg(&dev->pdev->dev,
"buffer[%d]= %d\n",
i, ((u32 *) buffer)[i]);
i++;
buffer_length -= sizeof(u32);
}
if (buffer_length > 0) {
*((u32 *) &temp_buf) = mei_mecbrw_read(dev);
memcpy(&buffer[i * 4], temp_buf, buffer_length);
}
dev->host_hw_state |= H_IG;
mei_hcsr_set(dev);
}
/**
* mei_flow_ctrl_creds - checks flow_control credentials.
*
* @dev: the device structure
* @cl: private data of the file object
*
* returns 1 if mei_flow_ctrl_creds >0, 0 - otherwise.
* -ENOENT if mei_cl is not present
* -EINVAL if single_recv_buf == 0
*/
int mei_flow_ctrl_creds(struct mei_device *dev, struct mei_cl *cl)
{
int i;
if (!dev->num_mei_me_clients)
return 0;
if (cl->mei_flow_ctrl_creds > 0)
return 1;
for (i = 0; i < dev->num_mei_me_clients; i++) {
struct mei_me_client *me_cl = &dev->me_clients[i];
if (me_cl->client_id == cl->me_client_id) {
if (me_cl->mei_flow_ctrl_creds) {
if (WARN_ON(me_cl->props.single_recv_buf == 0))
return -EINVAL;
return 1;
} else {
return 0;
}
}
}
return -ENOENT;
}
/**
* mei_flow_ctrl_reduce - reduces flow_control.
*
* @dev: the device structure
* @cl: private data of the file object
* @returns
* 0 on success
* -ENOENT when me client is not found
* -EINVAL wehn ctrl credits are <= 0
*/
int mei_flow_ctrl_reduce(struct mei_device *dev, struct mei_cl *cl)
{
int i;
if (!dev->num_mei_me_clients)
return -ENOENT;
for (i = 0; i < dev->num_mei_me_clients; i++) {
struct mei_me_client *me_cl = &dev->me_clients[i];
if (me_cl->client_id == cl->me_client_id) {
if (me_cl->props.single_recv_buf != 0) {
if (WARN_ON(me_cl->mei_flow_ctrl_creds <= 0))
return -EINVAL;
dev->me_clients[i].mei_flow_ctrl_creds--;
} else {
if (WARN_ON(cl->mei_flow_ctrl_creds <= 0))
return -EINVAL;
cl->mei_flow_ctrl_creds--;
}
return 0;
}
}
return -ENOENT;
}
/**
* mei_send_flow_control - sends flow control to fw.
*
* @dev: the device structure
* @cl: private data of the file object
*
* returns 1 if success, 0 - otherwise.
*/
int mei_send_flow_control(struct mei_device *dev, struct mei_cl *cl)
{
struct mei_msg_hdr *mei_hdr;
struct hbm_flow_control *mei_flow_control;
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = 0;
mei_hdr->me_addr = 0;
mei_hdr->length = sizeof(struct hbm_flow_control);
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
mei_flow_control = (struct hbm_flow_control *) &dev->wr_msg_buf[1];
memset(mei_flow_control, 0, sizeof(mei_flow_control));
mei_flow_control->host_addr = cl->host_client_id;
mei_flow_control->me_addr = cl->me_client_id;
mei_flow_control->cmd.cmd = MEI_FLOW_CONTROL_CMD;
memset(mei_flow_control->reserved, 0,
sizeof(mei_flow_control->reserved));
dev_dbg(&dev->pdev->dev, "sending flow control host client = %d, ME client = %d\n",
cl->host_client_id, cl->me_client_id);
if (!mei_write_message(dev, mei_hdr,
(unsigned char *) mei_flow_control,
sizeof(struct hbm_flow_control)))
return 0;
return 1;
}
/**
* mei_other_client_is_connecting - checks if other
* client with the same client id is connected.
*
* @dev: the device structure
* @cl: private data of the file object
*
* returns 1 if other client is connected, 0 - otherwise.
*/
int mei_other_client_is_connecting(struct mei_device *dev,
struct mei_cl *cl)
{
struct mei_cl *cl_pos = NULL;
struct mei_cl *cl_next = NULL;
list_for_each_entry_safe(cl_pos, cl_next, &dev->file_list, link) {
if ((cl_pos->state == MEI_FILE_CONNECTING) &&
(cl_pos != cl) &&
cl->me_client_id == cl_pos->me_client_id)
return 1;
}
return 0;
}
/**
* mei_disconnect - sends disconnect message to fw.
*
* @dev: the device structure
* @cl: private data of the file object
*
* returns 1 if success, 0 - otherwise.
*/
int mei_disconnect(struct mei_device *dev, struct mei_cl *cl)
{
struct mei_msg_hdr *mei_hdr;
struct hbm_client_disconnect_request *mei_cli_disconnect;
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = 0;
mei_hdr->me_addr = 0;
mei_hdr->length = sizeof(struct hbm_client_disconnect_request);
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
mei_cli_disconnect =
(struct hbm_client_disconnect_request *) &dev->wr_msg_buf[1];
memset(mei_cli_disconnect, 0, sizeof(mei_cli_disconnect));
mei_cli_disconnect->host_addr = cl->host_client_id;
mei_cli_disconnect->me_addr = cl->me_client_id;
mei_cli_disconnect->cmd.cmd = CLIENT_DISCONNECT_REQ_CMD;
mei_cli_disconnect->reserved[0] = 0;
if (!mei_write_message(dev, mei_hdr,
(unsigned char *) mei_cli_disconnect,
sizeof(struct hbm_client_disconnect_request)))
return 0;
return 1;
}
/**
* mei_connect - sends connect message to fw.
*
* @dev: the device structure
* @cl: private data of the file object
*
* returns 1 if success, 0 - otherwise.
*/
int mei_connect(struct mei_device *dev, struct mei_cl *cl)
{
struct mei_msg_hdr *mei_hdr;
struct hbm_client_connect_request *mei_cli_connect;
mei_hdr = (struct mei_msg_hdr *) &dev->wr_msg_buf[0];
mei_hdr->host_addr = 0;
mei_hdr->me_addr = 0;
mei_hdr->length = sizeof(struct hbm_client_connect_request);
mei_hdr->msg_complete = 1;
mei_hdr->reserved = 0;
mei_cli_connect =
(struct hbm_client_connect_request *) &dev->wr_msg_buf[1];
mei_cli_connect->host_addr = cl->host_client_id;
mei_cli_connect->me_addr = cl->me_client_id;
mei_cli_connect->cmd.cmd = CLIENT_CONNECT_REQ_CMD;
mei_cli_connect->reserved = 0;
if (!mei_write_message(dev, mei_hdr,
(unsigned char *) mei_cli_connect,
sizeof(struct hbm_client_connect_request)))
return 0;
return 1;
}
|