1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Mediated virtual PCI serial host device driver 4 * 5 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. 6 * Author: Neo Jia <cjia@nvidia.com> 7 * Kirti Wankhede <kwankhede@nvidia.com> 8 * 9 * Sample driver that creates mdev device that simulates serial port over PCI 10 * card. 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/device.h> 16 #include <linux/kernel.h> 17 #include <linux/fs.h> 18 #include <linux/poll.h> 19 #include <linux/slab.h> 20 #include <linux/cdev.h> 21 #include <linux/sched.h> 22 #include <linux/wait.h> 23 #include <linux/uuid.h> 24 #include <linux/vfio.h> 25 #include <linux/iommu.h> 26 #include <linux/sysfs.h> 27 #include <linux/ctype.h> 28 #include <linux/file.h> 29 #include <linux/mdev.h> 30 #include <linux/pci.h> 31 #include <linux/serial.h> 32 #include <uapi/linux/serial_reg.h> 33 #include <linux/eventfd.h> 34 /* 35 * #defines 36 */ 37 38 #define VERSION_STRING "0.1" 39 #define DRIVER_AUTHOR "NVIDIA Corporation" 40 41 #define MTTY_CLASS_NAME "mtty" 42 43 #define MTTY_NAME "mtty" 44 45 #define MTTY_STRING_LEN 16 46 47 #define MTTY_CONFIG_SPACE_SIZE 0xff 48 #define MTTY_IO_BAR_SIZE 0x8 49 #define MTTY_MMIO_BAR_SIZE 0x100000 50 51 #define STORE_LE16(addr, val) (*(u16 *)addr = val) 52 #define STORE_LE32(addr, val) (*(u32 *)addr = val) 53 54 #define MAX_FIFO_SIZE 16 55 56 #define CIRCULAR_BUF_INC_IDX(idx) (idx = (idx + 1) & (MAX_FIFO_SIZE - 1)) 57 58 #define MTTY_VFIO_PCI_OFFSET_SHIFT 40 59 60 #define MTTY_VFIO_PCI_OFFSET_TO_INDEX(off) (off >> MTTY_VFIO_PCI_OFFSET_SHIFT) 61 #define MTTY_VFIO_PCI_INDEX_TO_OFFSET(index) \ 62 ((u64)(index) << MTTY_VFIO_PCI_OFFSET_SHIFT) 63 #define MTTY_VFIO_PCI_OFFSET_MASK \ 64 (((u64)(1) << MTTY_VFIO_PCI_OFFSET_SHIFT) - 1) 65 #define MAX_MTTYS 24 66 67 /* 68 * Global Structures 69 */ 70 71 static struct mtty_dev { 72 dev_t vd_devt; 73 struct class *vd_class; 74 struct cdev vd_cdev; 75 struct idr vd_idr; 76 struct device dev; 77 } mtty_dev; 78 79 struct mdev_region_info { 80 u64 start; 81 u64 phys_start; 82 u32 size; 83 u64 vfio_offset; 84 }; 85 86 #if defined(DEBUG_REGS) 87 static const char *wr_reg[] = { 88 "TX", 89 "IER", 90 "FCR", 91 "LCR", 92 "MCR", 93 "LSR", 94 "MSR", 95 "SCR" 96 }; 97 98 static const char *rd_reg[] = { 99 "RX", 100 "IER", 101 "IIR", 102 "LCR", 103 "MCR", 104 "LSR", 105 "MSR", 106 "SCR" 107 }; 108 #endif 109 110 /* loop back buffer */ 111 struct rxtx { 112 u8 fifo[MAX_FIFO_SIZE]; 113 u8 head, tail; 114 u8 count; 115 }; 116 117 struct serial_port { 118 u8 uart_reg[8]; /* 8 registers */ 119 struct rxtx rxtx; /* loop back buffer */ 120 bool dlab; 121 bool overrun; 122 u16 divisor; 123 u8 fcr; /* FIFO control register */ 124 u8 max_fifo_size; 125 u8 intr_trigger_level; /* interrupt trigger level */ 126 }; 127 128 /* State of each mdev device */ 129 struct mdev_state { 130 int irq_fd; 131 struct eventfd_ctx *intx_evtfd; 132 struct eventfd_ctx *msi_evtfd; 133 int irq_index; 134 u8 *vconfig; 135 struct mutex ops_lock; 136 struct mdev_device *mdev; 137 struct mdev_region_info region_info[VFIO_PCI_NUM_REGIONS]; 138 u32 bar_mask[VFIO_PCI_NUM_REGIONS]; 139 struct list_head next; 140 struct serial_port s[2]; 141 struct mutex rxtx_lock; 142 struct vfio_device_info dev_info; 143 int nr_ports; 144 }; 145 146 static struct mutex mdev_list_lock; 147 static struct list_head mdev_devices_list; 148 149 static const struct file_operations vd_fops = { 150 .owner = THIS_MODULE, 151 }; 152 153 /* function prototypes */ 154 155 static int mtty_trigger_interrupt(struct mdev_state *mdev_state); 156 157 /* Helper functions */ 158 159 static void dump_buffer(u8 *buf, uint32_t count) 160 { 161 #if defined(DEBUG) 162 int i; 163 164 pr_info("Buffer:\n"); 165 for (i = 0; i < count; i++) { 166 pr_info("%2x ", *(buf + i)); 167 if ((i + 1) % 16 == 0) 168 pr_info("\n"); 169 } 170 #endif 171 } 172 173 static void mtty_create_config_space(struct mdev_state *mdev_state) 174 { 175 /* PCI dev ID */ 176 STORE_LE32((u32 *) &mdev_state->vconfig[0x0], 0x32534348); 177 178 /* Control: I/O+, Mem-, BusMaster- */ 179 STORE_LE16((u16 *) &mdev_state->vconfig[0x4], 0x0001); 180 181 /* Status: capabilities list absent */ 182 STORE_LE16((u16 *) &mdev_state->vconfig[0x6], 0x0200); 183 184 /* Rev ID */ 185 mdev_state->vconfig[0x8] = 0x10; 186 187 /* programming interface class : 16550-compatible serial controller */ 188 mdev_state->vconfig[0x9] = 0x02; 189 190 /* Sub class : 00 */ 191 mdev_state->vconfig[0xa] = 0x00; 192 193 /* Base class : Simple Communication controllers */ 194 mdev_state->vconfig[0xb] = 0x07; 195 196 /* base address registers */ 197 /* BAR0: IO space */ 198 STORE_LE32((u32 *) &mdev_state->vconfig[0x10], 0x000001); 199 mdev_state->bar_mask[0] = ~(MTTY_IO_BAR_SIZE) + 1; 200 201 if (mdev_state->nr_ports == 2) { 202 /* BAR1: IO space */ 203 STORE_LE32((u32 *) &mdev_state->vconfig[0x14], 0x000001); 204 mdev_state->bar_mask[1] = ~(MTTY_IO_BAR_SIZE) + 1; 205 } 206 207 /* Subsystem ID */ 208 STORE_LE32((u32 *) &mdev_state->vconfig[0x2c], 0x32534348); 209 210 mdev_state->vconfig[0x34] = 0x00; /* Cap Ptr */ 211 mdev_state->vconfig[0x3d] = 0x01; /* interrupt pin (INTA#) */ 212 213 /* Vendor specific data */ 214 mdev_state->vconfig[0x40] = 0x23; 215 mdev_state->vconfig[0x43] = 0x80; 216 mdev_state->vconfig[0x44] = 0x23; 217 mdev_state->vconfig[0x48] = 0x23; 218 mdev_state->vconfig[0x4c] = 0x23; 219 220 mdev_state->vconfig[0x60] = 0x50; 221 mdev_state->vconfig[0x61] = 0x43; 222 mdev_state->vconfig[0x62] = 0x49; 223 mdev_state->vconfig[0x63] = 0x20; 224 mdev_state->vconfig[0x64] = 0x53; 225 mdev_state->vconfig[0x65] = 0x65; 226 mdev_state->vconfig[0x66] = 0x72; 227 mdev_state->vconfig[0x67] = 0x69; 228 mdev_state->vconfig[0x68] = 0x61; 229 mdev_state->vconfig[0x69] = 0x6c; 230 mdev_state->vconfig[0x6a] = 0x2f; 231 mdev_state->vconfig[0x6b] = 0x55; 232 mdev_state->vconfig[0x6c] = 0x41; 233 mdev_state->vconfig[0x6d] = 0x52; 234 mdev_state->vconfig[0x6e] = 0x54; 235 } 236 237 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset, 238 u8 *buf, u32 count) 239 { 240 u32 cfg_addr, bar_mask, bar_index = 0; 241 242 switch (offset) { 243 case 0x04: /* device control */ 244 case 0x06: /* device status */ 245 /* do nothing */ 246 break; 247 case 0x3c: /* interrupt line */ 248 mdev_state->vconfig[0x3c] = buf[0]; 249 break; 250 case 0x3d: 251 /* 252 * Interrupt Pin is hardwired to INTA. 253 * This field is write protected by hardware 254 */ 255 break; 256 case 0x10: /* BAR0 */ 257 case 0x14: /* BAR1 */ 258 if (offset == 0x10) 259 bar_index = 0; 260 else if (offset == 0x14) 261 bar_index = 1; 262 263 if ((mdev_state->nr_ports == 1) && (bar_index == 1)) { 264 STORE_LE32(&mdev_state->vconfig[offset], 0); 265 break; 266 } 267 268 cfg_addr = *(u32 *)buf; 269 pr_info("BAR%d addr 0x%x\n", bar_index, cfg_addr); 270 271 if (cfg_addr == 0xffffffff) { 272 bar_mask = mdev_state->bar_mask[bar_index]; 273 cfg_addr = (cfg_addr & bar_mask); 274 } 275 276 cfg_addr |= (mdev_state->vconfig[offset] & 0x3ul); 277 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr); 278 break; 279 case 0x18: /* BAR2 */ 280 case 0x1c: /* BAR3 */ 281 case 0x20: /* BAR4 */ 282 STORE_LE32(&mdev_state->vconfig[offset], 0); 283 break; 284 default: 285 pr_info("PCI config write @0x%x of %d bytes not handled\n", 286 offset, count); 287 break; 288 } 289 } 290 291 static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state, 292 u16 offset, u8 *buf, u32 count) 293 { 294 u8 data = *buf; 295 296 /* Handle data written by guest */ 297 switch (offset) { 298 case UART_TX: 299 /* if DLAB set, data is LSB of divisor */ 300 if (mdev_state->s[index].dlab) { 301 mdev_state->s[index].divisor |= data; 302 break; 303 } 304 305 mutex_lock(&mdev_state->rxtx_lock); 306 307 /* save in TX buffer */ 308 if (mdev_state->s[index].rxtx.count < 309 mdev_state->s[index].max_fifo_size) { 310 mdev_state->s[index].rxtx.fifo[ 311 mdev_state->s[index].rxtx.head] = data; 312 mdev_state->s[index].rxtx.count++; 313 CIRCULAR_BUF_INC_IDX(mdev_state->s[index].rxtx.head); 314 mdev_state->s[index].overrun = false; 315 316 /* 317 * Trigger interrupt if receive data interrupt is 318 * enabled and fifo reached trigger level 319 */ 320 if ((mdev_state->s[index].uart_reg[UART_IER] & 321 UART_IER_RDI) && 322 (mdev_state->s[index].rxtx.count == 323 mdev_state->s[index].intr_trigger_level)) { 324 /* trigger interrupt */ 325 #if defined(DEBUG_INTR) 326 pr_err("Serial port %d: Fifo level trigger\n", 327 index); 328 #endif 329 mtty_trigger_interrupt(mdev_state); 330 } 331 } else { 332 #if defined(DEBUG_INTR) 333 pr_err("Serial port %d: Buffer Overflow\n", index); 334 #endif 335 mdev_state->s[index].overrun = true; 336 337 /* 338 * Trigger interrupt if receiver line status interrupt 339 * is enabled 340 */ 341 if (mdev_state->s[index].uart_reg[UART_IER] & 342 UART_IER_RLSI) 343 mtty_trigger_interrupt(mdev_state); 344 } 345 mutex_unlock(&mdev_state->rxtx_lock); 346 break; 347 348 case UART_IER: 349 /* if DLAB set, data is MSB of divisor */ 350 if (mdev_state->s[index].dlab) 351 mdev_state->s[index].divisor |= (u16)data << 8; 352 else { 353 mdev_state->s[index].uart_reg[offset] = data; 354 mutex_lock(&mdev_state->rxtx_lock); 355 if ((data & UART_IER_THRI) && 356 (mdev_state->s[index].rxtx.head == 357 mdev_state->s[index].rxtx.tail)) { 358 #if defined(DEBUG_INTR) 359 pr_err("Serial port %d: IER_THRI write\n", 360 index); 361 #endif 362 mtty_trigger_interrupt(mdev_state); 363 } 364 365 mutex_unlock(&mdev_state->rxtx_lock); 366 } 367 368 break; 369 370 case UART_FCR: 371 mdev_state->s[index].fcr = data; 372 373 mutex_lock(&mdev_state->rxtx_lock); 374 if (data & (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)) { 375 /* clear loop back FIFO */ 376 mdev_state->s[index].rxtx.count = 0; 377 mdev_state->s[index].rxtx.head = 0; 378 mdev_state->s[index].rxtx.tail = 0; 379 } 380 mutex_unlock(&mdev_state->rxtx_lock); 381 382 switch (data & UART_FCR_TRIGGER_MASK) { 383 case UART_FCR_TRIGGER_1: 384 mdev_state->s[index].intr_trigger_level = 1; 385 break; 386 387 case UART_FCR_TRIGGER_4: 388 mdev_state->s[index].intr_trigger_level = 4; 389 break; 390 391 case UART_FCR_TRIGGER_8: 392 mdev_state->s[index].intr_trigger_level = 8; 393 break; 394 395 case UART_FCR_TRIGGER_14: 396 mdev_state->s[index].intr_trigger_level = 14; 397 break; 398 } 399 400 /* 401 * Set trigger level to 1 otherwise or implement timer with 402 * timeout of 4 characters and on expiring that timer set 403 * Recevice data timeout in IIR register 404 */ 405 mdev_state->s[index].intr_trigger_level = 1; 406 if (data & UART_FCR_ENABLE_FIFO) 407 mdev_state->s[index].max_fifo_size = MAX_FIFO_SIZE; 408 else { 409 mdev_state->s[index].max_fifo_size = 1; 410 mdev_state->s[index].intr_trigger_level = 1; 411 } 412 413 break; 414 415 case UART_LCR: 416 if (data & UART_LCR_DLAB) { 417 mdev_state->s[index].dlab = true; 418 mdev_state->s[index].divisor = 0; 419 } else 420 mdev_state->s[index].dlab = false; 421 422 mdev_state->s[index].uart_reg[offset] = data; 423 break; 424 425 case UART_MCR: 426 mdev_state->s[index].uart_reg[offset] = data; 427 428 if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) && 429 (data & UART_MCR_OUT2)) { 430 #if defined(DEBUG_INTR) 431 pr_err("Serial port %d: MCR_OUT2 write\n", index); 432 #endif 433 mtty_trigger_interrupt(mdev_state); 434 } 435 436 if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) && 437 (data & (UART_MCR_RTS | UART_MCR_DTR))) { 438 #if defined(DEBUG_INTR) 439 pr_err("Serial port %d: MCR RTS/DTR write\n", index); 440 #endif 441 mtty_trigger_interrupt(mdev_state); 442 } 443 break; 444 445 case UART_LSR: 446 case UART_MSR: 447 /* do nothing */ 448 break; 449 450 case UART_SCR: 451 mdev_state->s[index].uart_reg[offset] = data; 452 break; 453 454 default: 455 break; 456 } 457 } 458 459 static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state, 460 u16 offset, u8 *buf, u32 count) 461 { 462 /* Handle read requests by guest */ 463 switch (offset) { 464 case UART_RX: 465 /* if DLAB set, data is LSB of divisor */ 466 if (mdev_state->s[index].dlab) { 467 *buf = (u8)mdev_state->s[index].divisor; 468 break; 469 } 470 471 mutex_lock(&mdev_state->rxtx_lock); 472 /* return data in tx buffer */ 473 if (mdev_state->s[index].rxtx.head != 474 mdev_state->s[index].rxtx.tail) { 475 *buf = mdev_state->s[index].rxtx.fifo[ 476 mdev_state->s[index].rxtx.tail]; 477 mdev_state->s[index].rxtx.count--; 478 CIRCULAR_BUF_INC_IDX(mdev_state->s[index].rxtx.tail); 479 } 480 481 if (mdev_state->s[index].rxtx.head == 482 mdev_state->s[index].rxtx.tail) { 483 /* 484 * Trigger interrupt if tx buffer empty interrupt is 485 * enabled and fifo is empty 486 */ 487 #if defined(DEBUG_INTR) 488 pr_err("Serial port %d: Buffer Empty\n", index); 489 #endif 490 if (mdev_state->s[index].uart_reg[UART_IER] & 491 UART_IER_THRI) 492 mtty_trigger_interrupt(mdev_state); 493 } 494 mutex_unlock(&mdev_state->rxtx_lock); 495 496 break; 497 498 case UART_IER: 499 if (mdev_state->s[index].dlab) { 500 *buf = (u8)(mdev_state->s[index].divisor >> 8); 501 break; 502 } 503 *buf = mdev_state->s[index].uart_reg[offset] & 0x0f; 504 break; 505 506 case UART_IIR: 507 { 508 u8 ier = mdev_state->s[index].uart_reg[UART_IER]; 509 *buf = 0; 510 511 mutex_lock(&mdev_state->rxtx_lock); 512 /* Interrupt priority 1: Parity, overrun, framing or break */ 513 if ((ier & UART_IER_RLSI) && mdev_state->s[index].overrun) 514 *buf |= UART_IIR_RLSI; 515 516 /* Interrupt priority 2: Fifo trigger level reached */ 517 if ((ier & UART_IER_RDI) && 518 (mdev_state->s[index].rxtx.count >= 519 mdev_state->s[index].intr_trigger_level)) 520 *buf |= UART_IIR_RDI; 521 522 /* Interrupt priotiry 3: transmitter holding register empty */ 523 if ((ier & UART_IER_THRI) && 524 (mdev_state->s[index].rxtx.head == 525 mdev_state->s[index].rxtx.tail)) 526 *buf |= UART_IIR_THRI; 527 528 /* Interrupt priotiry 4: Modem status: CTS, DSR, RI or DCD */ 529 if ((ier & UART_IER_MSI) && 530 (mdev_state->s[index].uart_reg[UART_MCR] & 531 (UART_MCR_RTS | UART_MCR_DTR))) 532 *buf |= UART_IIR_MSI; 533 534 /* bit0: 0=> interrupt pending, 1=> no interrupt is pending */ 535 if (*buf == 0) 536 *buf = UART_IIR_NO_INT; 537 538 /* set bit 6 & 7 to be 16550 compatible */ 539 *buf |= 0xC0; 540 mutex_unlock(&mdev_state->rxtx_lock); 541 } 542 break; 543 544 case UART_LCR: 545 case UART_MCR: 546 *buf = mdev_state->s[index].uart_reg[offset]; 547 break; 548 549 case UART_LSR: 550 { 551 u8 lsr = 0; 552 553 mutex_lock(&mdev_state->rxtx_lock); 554 /* atleast one char in FIFO */ 555 if (mdev_state->s[index].rxtx.head != 556 mdev_state->s[index].rxtx.tail) 557 lsr |= UART_LSR_DR; 558 559 /* if FIFO overrun */ 560 if (mdev_state->s[index].overrun) 561 lsr |= UART_LSR_OE; 562 563 /* transmit FIFO empty and tramsitter empty */ 564 if (mdev_state->s[index].rxtx.head == 565 mdev_state->s[index].rxtx.tail) 566 lsr |= UART_LSR_TEMT | UART_LSR_THRE; 567 568 mutex_unlock(&mdev_state->rxtx_lock); 569 *buf = lsr; 570 break; 571 } 572 case UART_MSR: 573 *buf = UART_MSR_DSR | UART_MSR_DDSR | UART_MSR_DCD; 574 575 mutex_lock(&mdev_state->rxtx_lock); 576 /* if AFE is 1 and FIFO have space, set CTS bit */ 577 if (mdev_state->s[index].uart_reg[UART_MCR] & 578 UART_MCR_AFE) { 579 if (mdev_state->s[index].rxtx.count < 580 mdev_state->s[index].max_fifo_size) 581 *buf |= UART_MSR_CTS | UART_MSR_DCTS; 582 } else 583 *buf |= UART_MSR_CTS | UART_MSR_DCTS; 584 mutex_unlock(&mdev_state->rxtx_lock); 585 586 break; 587 588 case UART_SCR: 589 *buf = mdev_state->s[index].uart_reg[offset]; 590 break; 591 592 default: 593 break; 594 } 595 } 596 597 static void mdev_read_base(struct mdev_state *mdev_state) 598 { 599 int index, pos; 600 u32 start_lo, start_hi; 601 u32 mem_type; 602 603 pos = PCI_BASE_ADDRESS_0; 604 605 for (index = 0; index <= VFIO_PCI_BAR5_REGION_INDEX; index++) { 606 607 if (!mdev_state->region_info[index].size) 608 continue; 609 610 start_lo = (*(u32 *)(mdev_state->vconfig + pos)) & 611 PCI_BASE_ADDRESS_MEM_MASK; 612 mem_type = (*(u32 *)(mdev_state->vconfig + pos)) & 613 PCI_BASE_ADDRESS_MEM_TYPE_MASK; 614 615 switch (mem_type) { 616 case PCI_BASE_ADDRESS_MEM_TYPE_64: 617 start_hi = (*(u32 *)(mdev_state->vconfig + pos + 4)); 618 pos += 4; 619 break; 620 case PCI_BASE_ADDRESS_MEM_TYPE_32: 621 case PCI_BASE_ADDRESS_MEM_TYPE_1M: 622 /* 1M mem BAR treated as 32-bit BAR */ 623 default: 624 /* mem unknown type treated as 32-bit BAR */ 625 start_hi = 0; 626 break; 627 } 628 pos += 4; 629 mdev_state->region_info[index].start = ((u64)start_hi << 32) | 630 start_lo; 631 } 632 } 633 634 static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, 635 loff_t pos, bool is_write) 636 { 637 struct mdev_state *mdev_state; 638 unsigned int index; 639 loff_t offset; 640 int ret = 0; 641 642 if (!mdev || !buf) 643 return -EINVAL; 644 645 mdev_state = mdev_get_drvdata(mdev); 646 if (!mdev_state) { 647 pr_err("%s mdev_state not found\n", __func__); 648 return -EINVAL; 649 } 650 651 mutex_lock(&mdev_state->ops_lock); 652 653 index = MTTY_VFIO_PCI_OFFSET_TO_INDEX(pos); 654 offset = pos & MTTY_VFIO_PCI_OFFSET_MASK; 655 switch (index) { 656 case VFIO_PCI_CONFIG_REGION_INDEX: 657 658 #if defined(DEBUG) 659 pr_info("%s: PCI config space %s at offset 0x%llx\n", 660 __func__, is_write ? "write" : "read", offset); 661 #endif 662 if (is_write) { 663 dump_buffer(buf, count); 664 handle_pci_cfg_write(mdev_state, offset, buf, count); 665 } else { 666 memcpy(buf, (mdev_state->vconfig + offset), count); 667 dump_buffer(buf, count); 668 } 669 670 break; 671 672 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: 673 if (!mdev_state->region_info[index].start) 674 mdev_read_base(mdev_state); 675 676 if (is_write) { 677 dump_buffer(buf, count); 678 679 #if defined(DEBUG_REGS) 680 pr_info("%s: BAR%d WR @0x%llx %s val:0x%02x dlab:%d\n", 681 __func__, index, offset, wr_reg[offset], 682 *buf, mdev_state->s[index].dlab); 683 #endif 684 handle_bar_write(index, mdev_state, offset, buf, count); 685 } else { 686 handle_bar_read(index, mdev_state, offset, buf, count); 687 dump_buffer(buf, count); 688 689 #if defined(DEBUG_REGS) 690 pr_info("%s: BAR%d RD @0x%llx %s val:0x%02x dlab:%d\n", 691 __func__, index, offset, rd_reg[offset], 692 *buf, mdev_state->s[index].dlab); 693 #endif 694 } 695 break; 696 697 default: 698 ret = -1; 699 goto accessfailed; 700 } 701 702 ret = count; 703 704 705 accessfailed: 706 mutex_unlock(&mdev_state->ops_lock); 707 708 return ret; 709 } 710 711 static int mtty_create(struct mdev_device *mdev) 712 { 713 struct mdev_state *mdev_state; 714 int nr_ports = mdev_get_type_group_id(mdev) + 1; 715 716 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL); 717 if (mdev_state == NULL) 718 return -ENOMEM; 719 720 mdev_state->nr_ports = nr_ports; 721 mdev_state->irq_index = -1; 722 mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE; 723 mdev_state->s[1].max_fifo_size = MAX_FIFO_SIZE; 724 mutex_init(&mdev_state->rxtx_lock); 725 mdev_state->vconfig = kzalloc(MTTY_CONFIG_SPACE_SIZE, GFP_KERNEL); 726 727 if (mdev_state->vconfig == NULL) { 728 kfree(mdev_state); 729 return -ENOMEM; 730 } 731 732 mutex_init(&mdev_state->ops_lock); 733 mdev_state->mdev = mdev; 734 mdev_set_drvdata(mdev, mdev_state); 735 736 mtty_create_config_space(mdev_state); 737 738 mutex_lock(&mdev_list_lock); 739 list_add(&mdev_state->next, &mdev_devices_list); 740 mutex_unlock(&mdev_list_lock); 741 742 return 0; 743 } 744 745 static int mtty_remove(struct mdev_device *mdev) 746 { 747 struct mdev_state *mds, *tmp_mds; 748 struct mdev_state *mdev_state = mdev_get_drvdata(mdev); 749 int ret = -EINVAL; 750 751 mutex_lock(&mdev_list_lock); 752 list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) { 753 if (mdev_state == mds) { 754 list_del(&mdev_state->next); 755 mdev_set_drvdata(mdev, NULL); 756 kfree(mdev_state->vconfig); 757 kfree(mdev_state); 758 ret = 0; 759 break; 760 } 761 } 762 mutex_unlock(&mdev_list_lock); 763 764 return ret; 765 } 766 767 static int mtty_reset(struct mdev_device *mdev) 768 { 769 struct mdev_state *mdev_state; 770 771 if (!mdev) 772 return -EINVAL; 773 774 mdev_state = mdev_get_drvdata(mdev); 775 if (!mdev_state) 776 return -EINVAL; 777 778 pr_info("%s: called\n", __func__); 779 780 return 0; 781 } 782 783 static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf, 784 size_t count, loff_t *ppos) 785 { 786 unsigned int done = 0; 787 int ret; 788 789 while (count) { 790 size_t filled; 791 792 if (count >= 4 && !(*ppos % 4)) { 793 u32 val; 794 795 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 796 *ppos, false); 797 if (ret <= 0) 798 goto read_err; 799 800 if (copy_to_user(buf, &val, sizeof(val))) 801 goto read_err; 802 803 filled = 4; 804 } else if (count >= 2 && !(*ppos % 2)) { 805 u16 val; 806 807 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 808 *ppos, false); 809 if (ret <= 0) 810 goto read_err; 811 812 if (copy_to_user(buf, &val, sizeof(val))) 813 goto read_err; 814 815 filled = 2; 816 } else { 817 u8 val; 818 819 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 820 *ppos, false); 821 if (ret <= 0) 822 goto read_err; 823 824 if (copy_to_user(buf, &val, sizeof(val))) 825 goto read_err; 826 827 filled = 1; 828 } 829 830 count -= filled; 831 done += filled; 832 *ppos += filled; 833 buf += filled; 834 } 835 836 return done; 837 838 read_err: 839 return -EFAULT; 840 } 841 842 static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf, 843 size_t count, loff_t *ppos) 844 { 845 unsigned int done = 0; 846 int ret; 847 848 while (count) { 849 size_t filled; 850 851 if (count >= 4 && !(*ppos % 4)) { 852 u32 val; 853 854 if (copy_from_user(&val, buf, sizeof(val))) 855 goto write_err; 856 857 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 858 *ppos, true); 859 if (ret <= 0) 860 goto write_err; 861 862 filled = 4; 863 } else if (count >= 2 && !(*ppos % 2)) { 864 u16 val; 865 866 if (copy_from_user(&val, buf, sizeof(val))) 867 goto write_err; 868 869 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 870 *ppos, true); 871 if (ret <= 0) 872 goto write_err; 873 874 filled = 2; 875 } else { 876 u8 val; 877 878 if (copy_from_user(&val, buf, sizeof(val))) 879 goto write_err; 880 881 ret = mdev_access(mdev, (u8 *)&val, sizeof(val), 882 *ppos, true); 883 if (ret <= 0) 884 goto write_err; 885 886 filled = 1; 887 } 888 count -= filled; 889 done += filled; 890 *ppos += filled; 891 buf += filled; 892 } 893 894 return done; 895 write_err: 896 return -EFAULT; 897 } 898 899 static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags, 900 unsigned int index, unsigned int start, 901 unsigned int count, void *data) 902 { 903 int ret = 0; 904 struct mdev_state *mdev_state; 905 906 if (!mdev) 907 return -EINVAL; 908 909 mdev_state = mdev_get_drvdata(mdev); 910 if (!mdev_state) 911 return -EINVAL; 912 913 mutex_lock(&mdev_state->ops_lock); 914 switch (index) { 915 case VFIO_PCI_INTX_IRQ_INDEX: 916 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { 917 case VFIO_IRQ_SET_ACTION_MASK: 918 case VFIO_IRQ_SET_ACTION_UNMASK: 919 break; 920 case VFIO_IRQ_SET_ACTION_TRIGGER: 921 { 922 if (flags & VFIO_IRQ_SET_DATA_NONE) { 923 pr_info("%s: disable INTx\n", __func__); 924 if (mdev_state->intx_evtfd) 925 eventfd_ctx_put(mdev_state->intx_evtfd); 926 break; 927 } 928 929 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { 930 int fd = *(int *)data; 931 932 if (fd > 0) { 933 struct eventfd_ctx *evt; 934 935 evt = eventfd_ctx_fdget(fd); 936 if (IS_ERR(evt)) { 937 ret = PTR_ERR(evt); 938 break; 939 } 940 mdev_state->intx_evtfd = evt; 941 mdev_state->irq_fd = fd; 942 mdev_state->irq_index = index; 943 break; 944 } 945 } 946 break; 947 } 948 } 949 break; 950 case VFIO_PCI_MSI_IRQ_INDEX: 951 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { 952 case VFIO_IRQ_SET_ACTION_MASK: 953 case VFIO_IRQ_SET_ACTION_UNMASK: 954 break; 955 case VFIO_IRQ_SET_ACTION_TRIGGER: 956 if (flags & VFIO_IRQ_SET_DATA_NONE) { 957 if (mdev_state->msi_evtfd) 958 eventfd_ctx_put(mdev_state->msi_evtfd); 959 pr_info("%s: disable MSI\n", __func__); 960 mdev_state->irq_index = VFIO_PCI_INTX_IRQ_INDEX; 961 break; 962 } 963 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { 964 int fd = *(int *)data; 965 struct eventfd_ctx *evt; 966 967 if (fd <= 0) 968 break; 969 970 if (mdev_state->msi_evtfd) 971 break; 972 973 evt = eventfd_ctx_fdget(fd); 974 if (IS_ERR(evt)) { 975 ret = PTR_ERR(evt); 976 break; 977 } 978 mdev_state->msi_evtfd = evt; 979 mdev_state->irq_fd = fd; 980 mdev_state->irq_index = index; 981 } 982 break; 983 } 984 break; 985 case VFIO_PCI_MSIX_IRQ_INDEX: 986 pr_info("%s: MSIX_IRQ\n", __func__); 987 break; 988 case VFIO_PCI_ERR_IRQ_INDEX: 989 pr_info("%s: ERR_IRQ\n", __func__); 990 break; 991 case VFIO_PCI_REQ_IRQ_INDEX: 992 pr_info("%s: REQ_IRQ\n", __func__); 993 break; 994 } 995 996 mutex_unlock(&mdev_state->ops_lock); 997 return ret; 998 } 999 1000 static int mtty_trigger_interrupt(struct mdev_state *mdev_state) 1001 { 1002 int ret = -1; 1003 1004 if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) && 1005 (!mdev_state->msi_evtfd)) 1006 return -EINVAL; 1007 else if ((mdev_state->irq_index == VFIO_PCI_INTX_IRQ_INDEX) && 1008 (!mdev_state->intx_evtfd)) { 1009 pr_info("%s: Intr eventfd not found\n", __func__); 1010 return -EINVAL; 1011 } 1012 1013 if (mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) 1014 ret = eventfd_signal(mdev_state->msi_evtfd, 1); 1015 else 1016 ret = eventfd_signal(mdev_state->intx_evtfd, 1); 1017 1018 #if defined(DEBUG_INTR) 1019 pr_info("Intx triggered\n"); 1020 #endif 1021 if (ret != 1) 1022 pr_err("%s: eventfd signal failed (%d)\n", __func__, ret); 1023 1024 return ret; 1025 } 1026 1027 static int mtty_get_region_info(struct mdev_device *mdev, 1028 struct vfio_region_info *region_info, 1029 u16 *cap_type_id, void **cap_type) 1030 { 1031 unsigned int size = 0; 1032 struct mdev_state *mdev_state; 1033 u32 bar_index; 1034 1035 if (!mdev) 1036 return -EINVAL; 1037 1038 mdev_state = mdev_get_drvdata(mdev); 1039 if (!mdev_state) 1040 return -EINVAL; 1041 1042 bar_index = region_info->index; 1043 if (bar_index >= VFIO_PCI_NUM_REGIONS) 1044 return -EINVAL; 1045 1046 mutex_lock(&mdev_state->ops_lock); 1047 1048 switch (bar_index) { 1049 case VFIO_PCI_CONFIG_REGION_INDEX: 1050 size = MTTY_CONFIG_SPACE_SIZE; 1051 break; 1052 case VFIO_PCI_BAR0_REGION_INDEX: 1053 size = MTTY_IO_BAR_SIZE; 1054 break; 1055 case VFIO_PCI_BAR1_REGION_INDEX: 1056 if (mdev_state->nr_ports == 2) 1057 size = MTTY_IO_BAR_SIZE; 1058 break; 1059 default: 1060 size = 0; 1061 break; 1062 } 1063 1064 mdev_state->region_info[bar_index].size = size; 1065 mdev_state->region_info[bar_index].vfio_offset = 1066 MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index); 1067 1068 region_info->size = size; 1069 region_info->offset = MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index); 1070 region_info->flags = VFIO_REGION_INFO_FLAG_READ | 1071 VFIO_REGION_INFO_FLAG_WRITE; 1072 mutex_unlock(&mdev_state->ops_lock); 1073 return 0; 1074 } 1075 1076 static int mtty_get_irq_info(struct mdev_device *mdev, 1077 struct vfio_irq_info *irq_info) 1078 { 1079 switch (irq_info->index) { 1080 case VFIO_PCI_INTX_IRQ_INDEX: 1081 case VFIO_PCI_MSI_IRQ_INDEX: 1082 case VFIO_PCI_REQ_IRQ_INDEX: 1083 break; 1084 1085 default: 1086 return -EINVAL; 1087 } 1088 1089 irq_info->flags = VFIO_IRQ_INFO_EVENTFD; 1090 irq_info->count = 1; 1091 1092 if (irq_info->index == VFIO_PCI_INTX_IRQ_INDEX) 1093 irq_info->flags |= (VFIO_IRQ_INFO_MASKABLE | 1094 VFIO_IRQ_INFO_AUTOMASKED); 1095 else 1096 irq_info->flags |= VFIO_IRQ_INFO_NORESIZE; 1097 1098 return 0; 1099 } 1100 1101 static int mtty_get_device_info(struct mdev_device *mdev, 1102 struct vfio_device_info *dev_info) 1103 { 1104 dev_info->flags = VFIO_DEVICE_FLAGS_PCI; 1105 dev_info->num_regions = VFIO_PCI_NUM_REGIONS; 1106 dev_info->num_irqs = VFIO_PCI_NUM_IRQS; 1107 1108 return 0; 1109 } 1110 1111 static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd, 1112 unsigned long arg) 1113 { 1114 int ret = 0; 1115 unsigned long minsz; 1116 struct mdev_state *mdev_state; 1117 1118 if (!mdev) 1119 return -EINVAL; 1120 1121 mdev_state = mdev_get_drvdata(mdev); 1122 if (!mdev_state) 1123 return -ENODEV; 1124 1125 switch (cmd) { 1126 case VFIO_DEVICE_GET_INFO: 1127 { 1128 struct vfio_device_info info; 1129 1130 minsz = offsetofend(struct vfio_device_info, num_irqs); 1131 1132 if (copy_from_user(&info, (void __user *)arg, minsz)) 1133 return -EFAULT; 1134 1135 if (info.argsz < minsz) 1136 return -EINVAL; 1137 1138 ret = mtty_get_device_info(mdev, &info); 1139 if (ret) 1140 return ret; 1141 1142 memcpy(&mdev_state->dev_info, &info, sizeof(info)); 1143 1144 if (copy_to_user((void __user *)arg, &info, minsz)) 1145 return -EFAULT; 1146 1147 return 0; 1148 } 1149 case VFIO_DEVICE_GET_REGION_INFO: 1150 { 1151 struct vfio_region_info info; 1152 u16 cap_type_id = 0; 1153 void *cap_type = NULL; 1154 1155 minsz = offsetofend(struct vfio_region_info, offset); 1156 1157 if (copy_from_user(&info, (void __user *)arg, minsz)) 1158 return -EFAULT; 1159 1160 if (info.argsz < minsz) 1161 return -EINVAL; 1162 1163 ret = mtty_get_region_info(mdev, &info, &cap_type_id, 1164 &cap_type); 1165 if (ret) 1166 return ret; 1167 1168 if (copy_to_user((void __user *)arg, &info, minsz)) 1169 return -EFAULT; 1170 1171 return 0; 1172 } 1173 1174 case VFIO_DEVICE_GET_IRQ_INFO: 1175 { 1176 struct vfio_irq_info info; 1177 1178 minsz = offsetofend(struct vfio_irq_info, count); 1179 1180 if (copy_from_user(&info, (void __user *)arg, minsz)) 1181 return -EFAULT; 1182 1183 if ((info.argsz < minsz) || 1184 (info.index >= mdev_state->dev_info.num_irqs)) 1185 return -EINVAL; 1186 1187 ret = mtty_get_irq_info(mdev, &info); 1188 if (ret) 1189 return ret; 1190 1191 if (copy_to_user((void __user *)arg, &info, minsz)) 1192 return -EFAULT; 1193 1194 return 0; 1195 } 1196 case VFIO_DEVICE_SET_IRQS: 1197 { 1198 struct vfio_irq_set hdr; 1199 u8 *data = NULL, *ptr = NULL; 1200 size_t data_size = 0; 1201 1202 minsz = offsetofend(struct vfio_irq_set, count); 1203 1204 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 1205 return -EFAULT; 1206 1207 ret = vfio_set_irqs_validate_and_prepare(&hdr, 1208 mdev_state->dev_info.num_irqs, 1209 VFIO_PCI_NUM_IRQS, 1210 &data_size); 1211 if (ret) 1212 return ret; 1213 1214 if (data_size) { 1215 ptr = data = memdup_user((void __user *)(arg + minsz), 1216 data_size); 1217 if (IS_ERR(data)) 1218 return PTR_ERR(data); 1219 } 1220 1221 ret = mtty_set_irqs(mdev, hdr.flags, hdr.index, hdr.start, 1222 hdr.count, data); 1223 1224 kfree(ptr); 1225 return ret; 1226 } 1227 case VFIO_DEVICE_RESET: 1228 return mtty_reset(mdev); 1229 } 1230 return -ENOTTY; 1231 } 1232 1233 static int mtty_open(struct mdev_device *mdev) 1234 { 1235 pr_info("%s\n", __func__); 1236 return 0; 1237 } 1238 1239 static void mtty_close(struct mdev_device *mdev) 1240 { 1241 pr_info("%s\n", __func__); 1242 } 1243 1244 static ssize_t 1245 sample_mtty_dev_show(struct device *dev, struct device_attribute *attr, 1246 char *buf) 1247 { 1248 return sprintf(buf, "This is phy device\n"); 1249 } 1250 1251 static DEVICE_ATTR_RO(sample_mtty_dev); 1252 1253 static struct attribute *mtty_dev_attrs[] = { 1254 &dev_attr_sample_mtty_dev.attr, 1255 NULL, 1256 }; 1257 1258 static const struct attribute_group mtty_dev_group = { 1259 .name = "mtty_dev", 1260 .attrs = mtty_dev_attrs, 1261 }; 1262 1263 static const struct attribute_group *mtty_dev_groups[] = { 1264 &mtty_dev_group, 1265 NULL, 1266 }; 1267 1268 static ssize_t 1269 sample_mdev_dev_show(struct device *dev, struct device_attribute *attr, 1270 char *buf) 1271 { 1272 if (mdev_from_dev(dev)) 1273 return sprintf(buf, "This is MDEV %s\n", dev_name(dev)); 1274 1275 return sprintf(buf, "\n"); 1276 } 1277 1278 static DEVICE_ATTR_RO(sample_mdev_dev); 1279 1280 static struct attribute *mdev_dev_attrs[] = { 1281 &dev_attr_sample_mdev_dev.attr, 1282 NULL, 1283 }; 1284 1285 static const struct attribute_group mdev_dev_group = { 1286 .name = "vendor", 1287 .attrs = mdev_dev_attrs, 1288 }; 1289 1290 static const struct attribute_group *mdev_dev_groups[] = { 1291 &mdev_dev_group, 1292 NULL, 1293 }; 1294 1295 static ssize_t 1296 name_show(struct kobject *kobj, struct device *dev, char *buf) 1297 { 1298 static const char *name_str[2] = { "Single port serial", 1299 "Dual port serial" }; 1300 1301 return sysfs_emit(buf, "%s\n", 1302 name_str[mtype_get_type_group_id(kobj)]); 1303 } 1304 1305 static MDEV_TYPE_ATTR_RO(name); 1306 1307 static ssize_t 1308 available_instances_show(struct kobject *kobj, struct device *dev, char *buf) 1309 { 1310 struct mdev_state *mds; 1311 unsigned int ports = mtype_get_type_group_id(kobj) + 1; 1312 int used = 0; 1313 1314 list_for_each_entry(mds, &mdev_devices_list, next) 1315 used += mds->nr_ports; 1316 1317 return sprintf(buf, "%d\n", (MAX_MTTYS - used)/ports); 1318 } 1319 1320 static MDEV_TYPE_ATTR_RO(available_instances); 1321 1322 1323 static ssize_t device_api_show(struct kobject *kobj, struct device *dev, 1324 char *buf) 1325 { 1326 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING); 1327 } 1328 1329 static MDEV_TYPE_ATTR_RO(device_api); 1330 1331 static struct attribute *mdev_types_attrs[] = { 1332 &mdev_type_attr_name.attr, 1333 &mdev_type_attr_device_api.attr, 1334 &mdev_type_attr_available_instances.attr, 1335 NULL, 1336 }; 1337 1338 static struct attribute_group mdev_type_group1 = { 1339 .name = "1", 1340 .attrs = mdev_types_attrs, 1341 }; 1342 1343 static struct attribute_group mdev_type_group2 = { 1344 .name = "2", 1345 .attrs = mdev_types_attrs, 1346 }; 1347 1348 static struct attribute_group *mdev_type_groups[] = { 1349 &mdev_type_group1, 1350 &mdev_type_group2, 1351 NULL, 1352 }; 1353 1354 static const struct mdev_parent_ops mdev_fops = { 1355 .owner = THIS_MODULE, 1356 .dev_attr_groups = mtty_dev_groups, 1357 .mdev_attr_groups = mdev_dev_groups, 1358 .supported_type_groups = mdev_type_groups, 1359 .create = mtty_create, 1360 .remove = mtty_remove, 1361 .open = mtty_open, 1362 .release = mtty_close, 1363 .read = mtty_read, 1364 .write = mtty_write, 1365 .ioctl = mtty_ioctl, 1366 }; 1367 1368 static void mtty_device_release(struct device *dev) 1369 { 1370 dev_dbg(dev, "mtty: released\n"); 1371 } 1372 1373 static int __init mtty_dev_init(void) 1374 { 1375 int ret = 0; 1376 1377 pr_info("mtty_dev: %s\n", __func__); 1378 1379 memset(&mtty_dev, 0, sizeof(mtty_dev)); 1380 1381 idr_init(&mtty_dev.vd_idr); 1382 1383 ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK + 1, 1384 MTTY_NAME); 1385 1386 if (ret < 0) { 1387 pr_err("Error: failed to register mtty_dev, err:%d\n", ret); 1388 return ret; 1389 } 1390 1391 cdev_init(&mtty_dev.vd_cdev, &vd_fops); 1392 cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK + 1); 1393 1394 pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt)); 1395 1396 mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME); 1397 1398 if (IS_ERR(mtty_dev.vd_class)) { 1399 pr_err("Error: failed to register mtty_dev class\n"); 1400 ret = PTR_ERR(mtty_dev.vd_class); 1401 goto failed1; 1402 } 1403 1404 mtty_dev.dev.class = mtty_dev.vd_class; 1405 mtty_dev.dev.release = mtty_device_release; 1406 dev_set_name(&mtty_dev.dev, "%s", MTTY_NAME); 1407 1408 ret = device_register(&mtty_dev.dev); 1409 if (ret) 1410 goto failed2; 1411 1412 ret = mdev_register_device(&mtty_dev.dev, &mdev_fops); 1413 if (ret) 1414 goto failed3; 1415 1416 mutex_init(&mdev_list_lock); 1417 INIT_LIST_HEAD(&mdev_devices_list); 1418 1419 goto all_done; 1420 1421 failed3: 1422 1423 device_unregister(&mtty_dev.dev); 1424 failed2: 1425 class_destroy(mtty_dev.vd_class); 1426 1427 failed1: 1428 cdev_del(&mtty_dev.vd_cdev); 1429 unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); 1430 1431 all_done: 1432 return ret; 1433 } 1434 1435 static void __exit mtty_dev_exit(void) 1436 { 1437 mtty_dev.dev.bus = NULL; 1438 mdev_unregister_device(&mtty_dev.dev); 1439 1440 device_unregister(&mtty_dev.dev); 1441 idr_destroy(&mtty_dev.vd_idr); 1442 cdev_del(&mtty_dev.vd_cdev); 1443 unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); 1444 class_destroy(mtty_dev.vd_class); 1445 mtty_dev.vd_class = NULL; 1446 pr_info("mtty_dev: Unloaded!\n"); 1447 } 1448 1449 module_init(mtty_dev_init) 1450 module_exit(mtty_dev_exit) 1451 1452 MODULE_LICENSE("GPL v2"); 1453 MODULE_INFO(supported, "Test driver that simulate serial port over PCI"); 1454 MODULE_VERSION(VERSION_STRING); 1455 MODULE_AUTHOR(DRIVER_AUTHOR); 1456