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Linux 4.16.11
[linux/fpc-iii.git] / samples / vfio-mdev / mtty.c
blob09f255bdf3ace89b83b560b6d24a8ee1d136ee71
1 /*
2 * Mediated virtual PCI serial host device driver
3 *
4 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
5 * Author: Neo Jia <cjia@nvidia.com>
6 * Kirti Wankhede <kwankhede@nvidia.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Sample driver that creates mdev device that simulates serial port over PCI
13 * card.
14 *
15 */
16
17 #include <linux/init.h>
18 #include <linux/module.h>
19 #include <linux/device.h>
20 #include <linux/kernel.h>
21 #include <linux/fs.h>
22 #include <linux/poll.h>
23 #include <linux/slab.h>
24 #include <linux/cdev.h>
25 #include <linux/sched.h>
26 #include <linux/wait.h>
27 #include <linux/uuid.h>
28 #include <linux/vfio.h>
29 #include <linux/iommu.h>
30 #include <linux/sysfs.h>
31 #include <linux/ctype.h>
32 #include <linux/file.h>
33 #include <linux/mdev.h>
34 #include <linux/pci.h>
35 #include <linux/serial.h>
36 #include <uapi/linux/serial_reg.h>
37 #include <linux/eventfd.h>
38 /*
39 * #defines
40 */
41
42 #define VERSION_STRING "0.1"
43 #define DRIVER_AUTHOR "NVIDIA Corporation"
44
45 #define MTTY_CLASS_NAME "mtty"
46
47 #define MTTY_NAME "mtty"
48
49 #define MTTY_STRING_LEN 16
50
51 #define MTTY_CONFIG_SPACE_SIZE 0xff
52 #define MTTY_IO_BAR_SIZE 0x8
53 #define MTTY_MMIO_BAR_SIZE 0x100000
54
55 #define STORE_LE16(addr, val) (*(u16 *)addr = val)
56 #define STORE_LE32(addr, val) (*(u32 *)addr = val)
57
58 #define MAX_FIFO_SIZE 16
59
60 #define CIRCULAR_BUF_INC_IDX(idx) (idx = (idx + 1) & (MAX_FIFO_SIZE - 1))
61
62 #define MTTY_VFIO_PCI_OFFSET_SHIFT 40
63
64 #define MTTY_VFIO_PCI_OFFSET_TO_INDEX(off) (off >> MTTY_VFIO_PCI_OFFSET_SHIFT)
65 #define MTTY_VFIO_PCI_INDEX_TO_OFFSET(index) \
66 ((u64)(index) << MTTY_VFIO_PCI_OFFSET_SHIFT)
67 #define MTTY_VFIO_PCI_OFFSET_MASK \
68 (((u64)(1) << MTTY_VFIO_PCI_OFFSET_SHIFT) - 1)
69 #define MAX_MTTYS 24
70
71 /*
72 * Global Structures
73 */
74
75 struct mtty_dev {
76 dev_t vd_devt;
77 struct class *vd_class;
78 struct cdev vd_cdev;
79 struct idr vd_idr;
80 struct device dev;
81 } mtty_dev;
82
83 struct mdev_region_info {
84 u64 start;
85 u64 phys_start;
86 u32 size;
87 u64 vfio_offset;
88 };
89
90 #if defined(DEBUG_REGS)
91 const char *wr_reg[] = {
92 "TX",
93 "IER",
94 "FCR",
95 "LCR",
96 "MCR",
97 "LSR",
98 "MSR",
99 "SCR"
100 };
101
102 const char *rd_reg[] = {
103 "RX",
104 "IER",
105 "IIR",
106 "LCR",
107 "MCR",
108 "LSR",
109 "MSR",
110 "SCR"
111 };
112 #endif
113
114 /* loop back buffer */
115 struct rxtx {
116 u8 fifo[MAX_FIFO_SIZE];
117 u8 head, tail;
118 u8 count;
119 };
120
121 struct serial_port {
122 u8 uart_reg[8]; /* 8 registers */
123 struct rxtx rxtx; /* loop back buffer */
124 bool dlab;
125 bool overrun;
126 u16 divisor;
127 u8 fcr; /* FIFO control register */
128 u8 max_fifo_size;
129 u8 intr_trigger_level; /* interrupt trigger level */
130 };
131
132 /* State of each mdev device */
133 struct mdev_state {
134 int irq_fd;
135 struct eventfd_ctx *intx_evtfd;
136 struct eventfd_ctx *msi_evtfd;
137 int irq_index;
138 u8 *vconfig;
139 struct mutex ops_lock;
140 struct mdev_device *mdev;
141 struct mdev_region_info region_info[VFIO_PCI_NUM_REGIONS];
142 u32 bar_mask[VFIO_PCI_NUM_REGIONS];
143 struct list_head next;
144 struct serial_port s[2];
145 struct mutex rxtx_lock;
146 struct vfio_device_info dev_info;
147 int nr_ports;
148 };
149
150 struct mutex mdev_list_lock;
151 struct list_head mdev_devices_list;
152
153 static const struct file_operations vd_fops = {
154 .owner = THIS_MODULE,
155 };
156
157 /* function prototypes */
158
159 static int mtty_trigger_interrupt(uuid_le uuid);
160
161 /* Helper functions */
162 static struct mdev_state *find_mdev_state_by_uuid(uuid_le uuid)
163 {
164 struct mdev_state *mds;
165
166 list_for_each_entry(mds, &mdev_devices_list, next) {
167 if (uuid_le_cmp(mdev_uuid(mds->mdev), uuid) == 0)
168 return mds;
169 }
170
171 return NULL;
172 }
173
174 void dump_buffer(char *buf, uint32_t count)
175 {
176 #if defined(DEBUG)
177 int i;
178
179 pr_info("Buffer:\n");
180 for (i = 0; i < count; i++) {
181 pr_info("%2x ", *(buf + i));
182 if ((i + 1) % 16 == 0)
183 pr_info("\n");
184 }
185 #endif
186 }
187
188 static void mtty_create_config_space(struct mdev_state *mdev_state)
189 {
190 /* PCI dev ID */
191 STORE_LE32((u32 *) &mdev_state->vconfig[0x0], 0x32534348);
192
193 /* Control: I/O+, Mem-, BusMaster- */
194 STORE_LE16((u16 *) &mdev_state->vconfig[0x4], 0x0001);
195
196 /* Status: capabilities list absent */
197 STORE_LE16((u16 *) &mdev_state->vconfig[0x6], 0x0200);
198
199 /* Rev ID */
200 mdev_state->vconfig[0x8] = 0x10;
201
202 /* programming interface class : 16550-compatible serial controller */
203 mdev_state->vconfig[0x9] = 0x02;
204
205 /* Sub class : 00 */
206 mdev_state->vconfig[0xa] = 0x00;
207
208 /* Base class : Simple Communication controllers */
209 mdev_state->vconfig[0xb] = 0x07;
210
211 /* base address registers */
212 /* BAR0: IO space */
213 STORE_LE32((u32 *) &mdev_state->vconfig[0x10], 0x000001);
214 mdev_state->bar_mask[0] = ~(MTTY_IO_BAR_SIZE) + 1;
215
216 if (mdev_state->nr_ports == 2) {
217 /* BAR1: IO space */
218 STORE_LE32((u32 *) &mdev_state->vconfig[0x14], 0x000001);
219 mdev_state->bar_mask[1] = ~(MTTY_IO_BAR_SIZE) + 1;
220 }
221
222 /* Subsystem ID */
223 STORE_LE32((u32 *) &mdev_state->vconfig[0x2c], 0x32534348);
224
225 mdev_state->vconfig[0x34] = 0x00; /* Cap Ptr */
226 mdev_state->vconfig[0x3d] = 0x01; /* interrupt pin (INTA#) */
227
228 /* Vendor specific data */
229 mdev_state->vconfig[0x40] = 0x23;
230 mdev_state->vconfig[0x43] = 0x80;
231 mdev_state->vconfig[0x44] = 0x23;
232 mdev_state->vconfig[0x48] = 0x23;
233 mdev_state->vconfig[0x4c] = 0x23;
234
235 mdev_state->vconfig[0x60] = 0x50;
236 mdev_state->vconfig[0x61] = 0x43;
237 mdev_state->vconfig[0x62] = 0x49;
238 mdev_state->vconfig[0x63] = 0x20;
239 mdev_state->vconfig[0x64] = 0x53;
240 mdev_state->vconfig[0x65] = 0x65;
241 mdev_state->vconfig[0x66] = 0x72;
242 mdev_state->vconfig[0x67] = 0x69;
243 mdev_state->vconfig[0x68] = 0x61;
244 mdev_state->vconfig[0x69] = 0x6c;
245 mdev_state->vconfig[0x6a] = 0x2f;
246 mdev_state->vconfig[0x6b] = 0x55;
247 mdev_state->vconfig[0x6c] = 0x41;
248 mdev_state->vconfig[0x6d] = 0x52;
249 mdev_state->vconfig[0x6e] = 0x54;
250 }
251
252 static void handle_pci_cfg_write(struct mdev_state *mdev_state, u16 offset,
253 char *buf, u32 count)
254 {
255 u32 cfg_addr, bar_mask, bar_index = 0;
256
257 switch (offset) {
258 case 0x04: /* device control */
259 case 0x06: /* device status */
260 /* do nothing */
261 break;
262 case 0x3c: /* interrupt line */
263 mdev_state->vconfig[0x3c] = buf[0];
264 break;
265 case 0x3d:
266 /*
267 * Interrupt Pin is hardwired to INTA.
268 * This field is write protected by hardware
269 */
270 break;
271 case 0x10: /* BAR0 */
272 case 0x14: /* BAR1 */
273 if (offset == 0x10)
274 bar_index = 0;
275 else if (offset == 0x14)
276 bar_index = 1;
277
278 if ((mdev_state->nr_ports == 1) && (bar_index == 1)) {
279 STORE_LE32(&mdev_state->vconfig[offset], 0);
280 break;
281 }
282
283 cfg_addr = *(u32 *)buf;
284 pr_info("BAR%d addr 0x%x\n", bar_index, cfg_addr);
285
286 if (cfg_addr == 0xffffffff) {
287 bar_mask = mdev_state->bar_mask[bar_index];
288 cfg_addr = (cfg_addr & bar_mask);
289 }
290
291 cfg_addr |= (mdev_state->vconfig[offset] & 0x3ul);
292 STORE_LE32(&mdev_state->vconfig[offset], cfg_addr);
293 break;
294 case 0x18: /* BAR2 */
295 case 0x1c: /* BAR3 */
296 case 0x20: /* BAR4 */
297 STORE_LE32(&mdev_state->vconfig[offset], 0);
298 break;
299 default:
300 pr_info("PCI config write @0x%x of %d bytes not handled\n",
301 offset, count);
302 break;
303 }
304 }
305
306 static void handle_bar_write(unsigned int index, struct mdev_state *mdev_state,
307 u16 offset, char *buf, u32 count)
308 {
309 u8 data = *buf;
310
311 /* Handle data written by guest */
312 switch (offset) {
313 case UART_TX:
314 /* if DLAB set, data is LSB of divisor */
315 if (mdev_state->s[index].dlab) {
316 mdev_state->s[index].divisor |= data;
317 break;
318 }
319
320 mutex_lock(&mdev_state->rxtx_lock);
321
322 /* save in TX buffer */
323 if (mdev_state->s[index].rxtx.count <
324 mdev_state->s[index].max_fifo_size) {
325 mdev_state->s[index].rxtx.fifo[
326 mdev_state->s[index].rxtx.head] = data;
327 mdev_state->s[index].rxtx.count++;
328 CIRCULAR_BUF_INC_IDX(mdev_state->s[index].rxtx.head);
329 mdev_state->s[index].overrun = false;
330
331 /*
332 * Trigger interrupt if receive data interrupt is
333 * enabled and fifo reached trigger level
334 */
335 if ((mdev_state->s[index].uart_reg[UART_IER] &
336 UART_IER_RDI) &&
337 (mdev_state->s[index].rxtx.count ==
338 mdev_state->s[index].intr_trigger_level)) {
339 /* trigger interrupt */
340 #if defined(DEBUG_INTR)
341 pr_err("Serial port %d: Fifo level trigger\n",
342 index);
343 #endif
344 mtty_trigger_interrupt(
345 mdev_uuid(mdev_state->mdev));
346 }
347 } else {
348 #if defined(DEBUG_INTR)
349 pr_err("Serial port %d: Buffer Overflow\n", index);
350 #endif
351 mdev_state->s[index].overrun = true;
352
353 /*
354 * Trigger interrupt if receiver line status interrupt
355 * is enabled
356 */
357 if (mdev_state->s[index].uart_reg[UART_IER] &
358 UART_IER_RLSI)
359 mtty_trigger_interrupt(
360 mdev_uuid(mdev_state->mdev));
361 }
362 mutex_unlock(&mdev_state->rxtx_lock);
363 break;
364
365 case UART_IER:
366 /* if DLAB set, data is MSB of divisor */
367 if (mdev_state->s[index].dlab)
368 mdev_state->s[index].divisor |= (u16)data << 8;
369 else {
370 mdev_state->s[index].uart_reg[offset] = data;
371 mutex_lock(&mdev_state->rxtx_lock);
372 if ((data & UART_IER_THRI) &&
373 (mdev_state->s[index].rxtx.head ==
374 mdev_state->s[index].rxtx.tail)) {
375 #if defined(DEBUG_INTR)
376 pr_err("Serial port %d: IER_THRI write\n",
377 index);
378 #endif
379 mtty_trigger_interrupt(
380 mdev_uuid(mdev_state->mdev));
381 }
382
383 mutex_unlock(&mdev_state->rxtx_lock);
384 }
385
386 break;
387
388 case UART_FCR:
389 mdev_state->s[index].fcr = data;
390
391 mutex_lock(&mdev_state->rxtx_lock);
392 if (data & (UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT)) {
393 /* clear loop back FIFO */
394 mdev_state->s[index].rxtx.count = 0;
395 mdev_state->s[index].rxtx.head = 0;
396 mdev_state->s[index].rxtx.tail = 0;
397 }
398 mutex_unlock(&mdev_state->rxtx_lock);
399
400 switch (data & UART_FCR_TRIGGER_MASK) {
401 case UART_FCR_TRIGGER_1:
402 mdev_state->s[index].intr_trigger_level = 1;
403 break;
404
405 case UART_FCR_TRIGGER_4:
406 mdev_state->s[index].intr_trigger_level = 4;
407 break;
408
409 case UART_FCR_TRIGGER_8:
410 mdev_state->s[index].intr_trigger_level = 8;
411 break;
412
413 case UART_FCR_TRIGGER_14:
414 mdev_state->s[index].intr_trigger_level = 14;
415 break;
416 }
417
418 /*
419 * Set trigger level to 1 otherwise or implement timer with
420 * timeout of 4 characters and on expiring that timer set
421 * Recevice data timeout in IIR register
422 */
423 mdev_state->s[index].intr_trigger_level = 1;
424 if (data & UART_FCR_ENABLE_FIFO)
425 mdev_state->s[index].max_fifo_size = MAX_FIFO_SIZE;
426 else {
427 mdev_state->s[index].max_fifo_size = 1;
428 mdev_state->s[index].intr_trigger_level = 1;
429 }
430
431 break;
432
433 case UART_LCR:
434 if (data & UART_LCR_DLAB) {
435 mdev_state->s[index].dlab = true;
436 mdev_state->s[index].divisor = 0;
437 } else
438 mdev_state->s[index].dlab = false;
439
440 mdev_state->s[index].uart_reg[offset] = data;
441 break;
442
443 case UART_MCR:
444 mdev_state->s[index].uart_reg[offset] = data;
445
446 if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) &&
447 (data & UART_MCR_OUT2)) {
448 #if defined(DEBUG_INTR)
449 pr_err("Serial port %d: MCR_OUT2 write\n", index);
450 #endif
451 mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
452 }
453
454 if ((mdev_state->s[index].uart_reg[UART_IER] & UART_IER_MSI) &&
455 (data & (UART_MCR_RTS | UART_MCR_DTR))) {
456 #if defined(DEBUG_INTR)
457 pr_err("Serial port %d: MCR RTS/DTR write\n", index);
458 #endif
459 mtty_trigger_interrupt(mdev_uuid(mdev_state->mdev));
460 }
461 break;
462
463 case UART_LSR:
464 case UART_MSR:
465 /* do nothing */
466 break;
467
468 case UART_SCR:
469 mdev_state->s[index].uart_reg[offset] = data;
470 break;
471
472 default:
473 break;
474 }
475 }
476
477 static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,
478 u16 offset, char *buf, u32 count)
479 {
480 /* Handle read requests by guest */
481 switch (offset) {
482 case UART_RX:
483 /* if DLAB set, data is LSB of divisor */
484 if (mdev_state->s[index].dlab) {
485 *buf = (u8)mdev_state->s[index].divisor;
486 break;
487 }
488
489 mutex_lock(&mdev_state->rxtx_lock);
490 /* return data in tx buffer */
491 if (mdev_state->s[index].rxtx.head !=
492 mdev_state->s[index].rxtx.tail) {
493 *buf = mdev_state->s[index].rxtx.fifo[
494 mdev_state->s[index].rxtx.tail];
495 mdev_state->s[index].rxtx.count--;
496 CIRCULAR_BUF_INC_IDX(mdev_state->s[index].rxtx.tail);
497 }
498
499 if (mdev_state->s[index].rxtx.head ==
500 mdev_state->s[index].rxtx.tail) {
501 /*
502 * Trigger interrupt if tx buffer empty interrupt is
503 * enabled and fifo is empty
504 */
505 #if defined(DEBUG_INTR)
506 pr_err("Serial port %d: Buffer Empty\n", index);
507 #endif
508 if (mdev_state->s[index].uart_reg[UART_IER] &
509 UART_IER_THRI)
510 mtty_trigger_interrupt(
511 mdev_uuid(mdev_state->mdev));
512 }
513 mutex_unlock(&mdev_state->rxtx_lock);
514
515 break;
516
517 case UART_IER:
518 if (mdev_state->s[index].dlab) {
519 *buf = (u8)(mdev_state->s[index].divisor >> 8);
520 break;
521 }
522 *buf = mdev_state->s[index].uart_reg[offset] & 0x0f;
523 break;
524
525 case UART_IIR:
526 {
527 u8 ier = mdev_state->s[index].uart_reg[UART_IER];
528 *buf = 0;
529
530 mutex_lock(&mdev_state->rxtx_lock);
531 /* Interrupt priority 1: Parity, overrun, framing or break */
532 if ((ier & UART_IER_RLSI) && mdev_state->s[index].overrun)
533 *buf |= UART_IIR_RLSI;
534
535 /* Interrupt priority 2: Fifo trigger level reached */
536 if ((ier & UART_IER_RDI) &&
537 (mdev_state->s[index].rxtx.count ==
538 mdev_state->s[index].intr_trigger_level))
539 *buf |= UART_IIR_RDI;
540
541 /* Interrupt priotiry 3: transmitter holding register empty */
542 if ((ier & UART_IER_THRI) &&
543 (mdev_state->s[index].rxtx.head ==
544 mdev_state->s[index].rxtx.tail))
545 *buf |= UART_IIR_THRI;
546
547 /* Interrupt priotiry 4: Modem status: CTS, DSR, RI or DCD */
548 if ((ier & UART_IER_MSI) &&
549 (mdev_state->s[index].uart_reg[UART_MCR] &
550 (UART_MCR_RTS | UART_MCR_DTR)))
551 *buf |= UART_IIR_MSI;
552
553 /* bit0: 0=> interrupt pending, 1=> no interrupt is pending */
554 if (*buf == 0)
555 *buf = UART_IIR_NO_INT;
556
557 /* set bit 6 & 7 to be 16550 compatible */
558 *buf |= 0xC0;
559 mutex_unlock(&mdev_state->rxtx_lock);
560 }
561 break;
562
563 case UART_LCR:
564 case UART_MCR:
565 *buf = mdev_state->s[index].uart_reg[offset];
566 break;
567
568 case UART_LSR:
569 {
570 u8 lsr = 0;
571
572 mutex_lock(&mdev_state->rxtx_lock);
573 /* atleast one char in FIFO */
574 if (mdev_state->s[index].rxtx.head !=
575 mdev_state->s[index].rxtx.tail)
576 lsr |= UART_LSR_DR;
577
578 /* if FIFO overrun */
579 if (mdev_state->s[index].overrun)
580 lsr |= UART_LSR_OE;
581
582 /* transmit FIFO empty and tramsitter empty */
583 if (mdev_state->s[index].rxtx.head ==
584 mdev_state->s[index].rxtx.tail)
585 lsr |= UART_LSR_TEMT | UART_LSR_THRE;
586
587 mutex_unlock(&mdev_state->rxtx_lock);
588 *buf = lsr;
589 break;
590 }
591 case UART_MSR:
592 *buf = UART_MSR_DSR | UART_MSR_DDSR | UART_MSR_DCD;
593
594 mutex_lock(&mdev_state->rxtx_lock);
595 /* if AFE is 1 and FIFO have space, set CTS bit */
596 if (mdev_state->s[index].uart_reg[UART_MCR] &
597 UART_MCR_AFE) {
598 if (mdev_state->s[index].rxtx.count <
599 mdev_state->s[index].max_fifo_size)
600 *buf |= UART_MSR_CTS | UART_MSR_DCTS;
601 } else
602 *buf |= UART_MSR_CTS | UART_MSR_DCTS;
603 mutex_unlock(&mdev_state->rxtx_lock);
604
605 break;
606
607 case UART_SCR:
608 *buf = mdev_state->s[index].uart_reg[offset];
609 break;
610
611 default:
612 break;
613 }
614 }
615
616 static void mdev_read_base(struct mdev_state *mdev_state)
617 {
618 int index, pos;
619 u32 start_lo, start_hi;
620 u32 mem_type;
621
622 pos = PCI_BASE_ADDRESS_0;
623
624 for (index = 0; index <= VFIO_PCI_BAR5_REGION_INDEX; index++) {
625
626 if (!mdev_state->region_info[index].size)
627 continue;
628
629 start_lo = (*(u32 *)(mdev_state->vconfig + pos)) &
630 PCI_BASE_ADDRESS_MEM_MASK;
631 mem_type = (*(u32 *)(mdev_state->vconfig + pos)) &
632 PCI_BASE_ADDRESS_MEM_TYPE_MASK;
633
634 switch (mem_type) {
635 case PCI_BASE_ADDRESS_MEM_TYPE_64:
636 start_hi = (*(u32 *)(mdev_state->vconfig + pos + 4));
637 pos += 4;
638 break;
639 case PCI_BASE_ADDRESS_MEM_TYPE_32:
640 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
641 /* 1M mem BAR treated as 32-bit BAR */
642 default:
643 /* mem unknown type treated as 32-bit BAR */
644 start_hi = 0;
645 break;
646 }
647 pos += 4;
648 mdev_state->region_info[index].start = ((u64)start_hi << 32) |
649 start_lo;
650 }
651 }
652
653 static ssize_t mdev_access(struct mdev_device *mdev, char *buf, size_t count,
654 loff_t pos, bool is_write)
655 {
656 struct mdev_state *mdev_state;
657 unsigned int index;
658 loff_t offset;
659 int ret = 0;
660
661 if (!mdev || !buf)
662 return -EINVAL;
663
664 mdev_state = mdev_get_drvdata(mdev);
665 if (!mdev_state) {
666 pr_err("%s mdev_state not found\n", __func__);
667 return -EINVAL;
668 }
669
670 mutex_lock(&mdev_state->ops_lock);
671
672 index = MTTY_VFIO_PCI_OFFSET_TO_INDEX(pos);
673 offset = pos & MTTY_VFIO_PCI_OFFSET_MASK;
674 switch (index) {
675 case VFIO_PCI_CONFIG_REGION_INDEX:
676
677 #if defined(DEBUG)
678 pr_info("%s: PCI config space %s at offset 0x%llx\n",
679 __func__, is_write ? "write" : "read", offset);
680 #endif
681 if (is_write) {
682 dump_buffer(buf, count);
683 handle_pci_cfg_write(mdev_state, offset, buf, count);
684 } else {
685 memcpy(buf, (mdev_state->vconfig + offset), count);
686 dump_buffer(buf, count);
687 }
688
689 break;
690
691 case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
692 if (!mdev_state->region_info[index].start)
693 mdev_read_base(mdev_state);
694
695 if (is_write) {
696 dump_buffer(buf, count);
697
698 #if defined(DEBUG_REGS)
699 pr_info("%s: BAR%d WR @0x%llx %s val:0x%02x dlab:%d\n",
700 __func__, index, offset, wr_reg[offset],
701 (u8)*buf, mdev_state->s[index].dlab);
702 #endif
703 handle_bar_write(index, mdev_state, offset, buf, count);
704 } else {
705 handle_bar_read(index, mdev_state, offset, buf, count);
706 dump_buffer(buf, count);
707
708 #if defined(DEBUG_REGS)
709 pr_info("%s: BAR%d RD @0x%llx %s val:0x%02x dlab:%d\n",
710 __func__, index, offset, rd_reg[offset],
711 (u8)*buf, mdev_state->s[index].dlab);
712 #endif
713 }
714 break;
715
716 default:
717 ret = -1;
718 goto accessfailed;
719 }
720
721 ret = count;
722
723
724 accessfailed:
725 mutex_unlock(&mdev_state->ops_lock);
726
727 return ret;
728 }
729
730 int mtty_create(struct kobject *kobj, struct mdev_device *mdev)
731 {
732 struct mdev_state *mdev_state;
733 char name[MTTY_STRING_LEN];
734 int nr_ports = 0, i;
735
736 if (!mdev)
737 return -EINVAL;
738
739 for (i = 0; i < 2; i++) {
740 snprintf(name, MTTY_STRING_LEN, "%s-%d",
741 dev_driver_string(mdev_parent_dev(mdev)), i + 1);
742 if (!strcmp(kobj->name, name)) {
743 nr_ports = i + 1;
744 break;
745 }
746 }
747
748 if (!nr_ports)
749 return -EINVAL;
750
751 mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
752 if (mdev_state == NULL)
753 return -ENOMEM;
754
755 mdev_state->nr_ports = nr_ports;
756 mdev_state->irq_index = -1;
757 mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE;
758 mdev_state->s[1].max_fifo_size = MAX_FIFO_SIZE;
759 mutex_init(&mdev_state->rxtx_lock);
760 mdev_state->vconfig = kzalloc(MTTY_CONFIG_SPACE_SIZE, GFP_KERNEL);
761
762 if (mdev_state->vconfig == NULL) {
763 kfree(mdev_state);
764 return -ENOMEM;
765 }
766
767 mutex_init(&mdev_state->ops_lock);
768 mdev_state->mdev = mdev;
769 mdev_set_drvdata(mdev, mdev_state);
770
771 mtty_create_config_space(mdev_state);
772
773 mutex_lock(&mdev_list_lock);
774 list_add(&mdev_state->next, &mdev_devices_list);
775 mutex_unlock(&mdev_list_lock);
776
777 return 0;
778 }
779
780 int mtty_remove(struct mdev_device *mdev)
781 {
782 struct mdev_state *mds, *tmp_mds;
783 struct mdev_state *mdev_state = mdev_get_drvdata(mdev);
784 int ret = -EINVAL;
785
786 mutex_lock(&mdev_list_lock);
787 list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) {
788 if (mdev_state == mds) {
789 list_del(&mdev_state->next);
790 mdev_set_drvdata(mdev, NULL);
791 kfree(mdev_state->vconfig);
792 kfree(mdev_state);
793 ret = 0;
794 break;
795 }
796 }
797 mutex_unlock(&mdev_list_lock);
798
799 return ret;
800 }
801
802 int mtty_reset(struct mdev_device *mdev)
803 {
804 struct mdev_state *mdev_state;
805
806 if (!mdev)
807 return -EINVAL;
808
809 mdev_state = mdev_get_drvdata(mdev);
810 if (!mdev_state)
811 return -EINVAL;
812
813 pr_info("%s: called\n", __func__);
814
815 return 0;
816 }
817
818 ssize_t mtty_read(struct mdev_device *mdev, char __user *buf, size_t count,
819 loff_t *ppos)
820 {
821 unsigned int done = 0;
822 int ret;
823
824 while (count) {
825 size_t filled;
826
827 if (count >= 4 && !(*ppos % 4)) {
828 u32 val;
829
830 ret = mdev_access(mdev, (char *)&val, sizeof(val),
831 *ppos, false);
832 if (ret <= 0)
833 goto read_err;
834
835 if (copy_to_user(buf, &val, sizeof(val)))
836 goto read_err;
837
838 filled = 4;
839 } else if (count >= 2 && !(*ppos % 2)) {
840 u16 val;
841
842 ret = mdev_access(mdev, (char *)&val, sizeof(val),
843 *ppos, false);
844 if (ret <= 0)
845 goto read_err;
846
847 if (copy_to_user(buf, &val, sizeof(val)))
848 goto read_err;
849
850 filled = 2;
851 } else {
852 u8 val;
853
854 ret = mdev_access(mdev, (char *)&val, sizeof(val),
855 *ppos, false);
856 if (ret <= 0)
857 goto read_err;
858
859 if (copy_to_user(buf, &val, sizeof(val)))
860 goto read_err;
861
862 filled = 1;
863 }
864
865 count -= filled;
866 done += filled;
867 *ppos += filled;
868 buf += filled;
869 }
870
871 return done;
872
873 read_err:
874 return -EFAULT;
875 }
876
877 ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf,
878 size_t count, loff_t *ppos)
879 {
880 unsigned int done = 0;
881 int ret;
882
883 while (count) {
884 size_t filled;
885
886 if (count >= 4 && !(*ppos % 4)) {
887 u32 val;
888
889 if (copy_from_user(&val, buf, sizeof(val)))
890 goto write_err;
891
892 ret = mdev_access(mdev, (char *)&val, sizeof(val),
893 *ppos, true);
894 if (ret <= 0)
895 goto write_err;
896
897 filled = 4;
898 } else if (count >= 2 && !(*ppos % 2)) {
899 u16 val;
900
901 if (copy_from_user(&val, buf, sizeof(val)))
902 goto write_err;
903
904 ret = mdev_access(mdev, (char *)&val, sizeof(val),
905 *ppos, true);
906 if (ret <= 0)
907 goto write_err;
908
909 filled = 2;
910 } else {
911 u8 val;
912
913 if (copy_from_user(&val, buf, sizeof(val)))
914 goto write_err;
915
916 ret = mdev_access(mdev, (char *)&val, sizeof(val),
917 *ppos, true);
918 if (ret <= 0)
919 goto write_err;
920
921 filled = 1;
922 }
923 count -= filled;
924 done += filled;
925 *ppos += filled;
926 buf += filled;
927 }
928
929 return done;
930 write_err:
931 return -EFAULT;
932 }
933
934 static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags,
935 unsigned int index, unsigned int start,
936 unsigned int count, void *data)
937 {
938 int ret = 0;
939 struct mdev_state *mdev_state;
940
941 if (!mdev)
942 return -EINVAL;
943
944 mdev_state = mdev_get_drvdata(mdev);
945 if (!mdev_state)
946 return -EINVAL;
947
948 mutex_lock(&mdev_state->ops_lock);
949 switch (index) {
950 case VFIO_PCI_INTX_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 {
957 if (flags & VFIO_IRQ_SET_DATA_NONE) {
958 pr_info("%s: disable INTx\n", __func__);
959 if (mdev_state->intx_evtfd)
960 eventfd_ctx_put(mdev_state->intx_evtfd);
961 break;
962 }
963
964 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
965 int fd = *(int *)data;
966
967 if (fd > 0) {
968 struct eventfd_ctx *evt;
969
970 evt = eventfd_ctx_fdget(fd);
971 if (IS_ERR(evt)) {
972 ret = PTR_ERR(evt);
973 break;
974 }
975 mdev_state->intx_evtfd = evt;
976 mdev_state->irq_fd = fd;
977 mdev_state->irq_index = index;
978 break;
979 }
980 }
981 break;
982 }
983 }
984 break;
985 case VFIO_PCI_MSI_IRQ_INDEX:
986 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
987 case VFIO_IRQ_SET_ACTION_MASK:
988 case VFIO_IRQ_SET_ACTION_UNMASK:
989 break;
990 case VFIO_IRQ_SET_ACTION_TRIGGER:
991 if (flags & VFIO_IRQ_SET_DATA_NONE) {
992 if (mdev_state->msi_evtfd)
993 eventfd_ctx_put(mdev_state->msi_evtfd);
994 pr_info("%s: disable MSI\n", __func__);
995 mdev_state->irq_index = VFIO_PCI_INTX_IRQ_INDEX;
996 break;
997 }
998 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
999 int fd = *(int *)data;
1000 struct eventfd_ctx *evt;
1001
1002 if (fd <= 0)
1003 break;
1004
1005 if (mdev_state->msi_evtfd)
1006 break;
1007
1008 evt = eventfd_ctx_fdget(fd);
1009 if (IS_ERR(evt)) {
1010 ret = PTR_ERR(evt);
1011 break;
1012 }
1013 mdev_state->msi_evtfd = evt;
1014 mdev_state->irq_fd = fd;
1015 mdev_state->irq_index = index;
1016 }
1017 break;
1018 }
1019 break;
1020 case VFIO_PCI_MSIX_IRQ_INDEX:
1021 pr_info("%s: MSIX_IRQ\n", __func__);
1022 break;
1023 case VFIO_PCI_ERR_IRQ_INDEX:
1024 pr_info("%s: ERR_IRQ\n", __func__);
1025 break;
1026 case VFIO_PCI_REQ_IRQ_INDEX:
1027 pr_info("%s: REQ_IRQ\n", __func__);
1028 break;
1029 }
1030
1031 mutex_unlock(&mdev_state->ops_lock);
1032 return ret;
1033 }
1034
1035 static int mtty_trigger_interrupt(uuid_le uuid)
1036 {
1037 int ret = -1;
1038 struct mdev_state *mdev_state;
1039
1040 mdev_state = find_mdev_state_by_uuid(uuid);
1041
1042 if (!mdev_state) {
1043 pr_info("%s: mdev not found\n", __func__);
1044 return -EINVAL;
1045 }
1046
1047 if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) &&
1048 (!mdev_state->msi_evtfd))
1049 return -EINVAL;
1050 else if ((mdev_state->irq_index == VFIO_PCI_INTX_IRQ_INDEX) &&
1051 (!mdev_state->intx_evtfd)) {
1052 pr_info("%s: Intr eventfd not found\n", __func__);
1053 return -EINVAL;
1054 }
1055
1056 if (mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX)
1057 ret = eventfd_signal(mdev_state->msi_evtfd, 1);
1058 else
1059 ret = eventfd_signal(mdev_state->intx_evtfd, 1);
1060
1061 #if defined(DEBUG_INTR)
1062 pr_info("Intx triggered\n");
1063 #endif
1064 if (ret != 1)
1065 pr_err("%s: eventfd signal failed (%d)\n", __func__, ret);
1066
1067 return ret;
1068 }
1069
1070 int mtty_get_region_info(struct mdev_device *mdev,
1071 struct vfio_region_info *region_info,
1072 u16 *cap_type_id, void **cap_type)
1073 {
1074 unsigned int size = 0;
1075 struct mdev_state *mdev_state;
1076 u32 bar_index;
1077
1078 if (!mdev)
1079 return -EINVAL;
1080
1081 mdev_state = mdev_get_drvdata(mdev);
1082 if (!mdev_state)
1083 return -EINVAL;
1084
1085 bar_index = region_info->index;
1086 if (bar_index >= VFIO_PCI_NUM_REGIONS)
1087 return -EINVAL;
1088
1089 mutex_lock(&mdev_state->ops_lock);
1090
1091 switch (bar_index) {
1092 case VFIO_PCI_CONFIG_REGION_INDEX:
1093 size = MTTY_CONFIG_SPACE_SIZE;
1094 break;
1095 case VFIO_PCI_BAR0_REGION_INDEX:
1096 size = MTTY_IO_BAR_SIZE;
1097 break;
1098 case VFIO_PCI_BAR1_REGION_INDEX:
1099 if (mdev_state->nr_ports == 2)
1100 size = MTTY_IO_BAR_SIZE;
1101 break;
1102 default:
1103 size = 0;
1104 break;
1105 }
1106
1107 mdev_state->region_info[bar_index].size = size;
1108 mdev_state->region_info[bar_index].vfio_offset =
1109 MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index);
1110
1111 region_info->size = size;
1112 region_info->offset = MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index);
1113 region_info->flags = VFIO_REGION_INFO_FLAG_READ |
1114 VFIO_REGION_INFO_FLAG_WRITE;
1115 mutex_unlock(&mdev_state->ops_lock);
1116 return 0;
1117 }
1118
1119 int mtty_get_irq_info(struct mdev_device *mdev, struct vfio_irq_info *irq_info)
1120 {
1121 switch (irq_info->index) {
1122 case VFIO_PCI_INTX_IRQ_INDEX:
1123 case VFIO_PCI_MSI_IRQ_INDEX:
1124 case VFIO_PCI_REQ_IRQ_INDEX:
1125 break;
1126
1127 default:
1128 return -EINVAL;
1129 }
1130
1131 irq_info->flags = VFIO_IRQ_INFO_EVENTFD;
1132 irq_info->count = 1;
1133
1134 if (irq_info->index == VFIO_PCI_INTX_IRQ_INDEX)
1135 irq_info->flags |= (VFIO_IRQ_INFO_MASKABLE |
1136 VFIO_IRQ_INFO_AUTOMASKED);
1137 else
1138 irq_info->flags |= VFIO_IRQ_INFO_NORESIZE;
1139
1140 return 0;
1141 }
1142
1143 int mtty_get_device_info(struct mdev_device *mdev,
1144 struct vfio_device_info *dev_info)
1145 {
1146 dev_info->flags = VFIO_DEVICE_FLAGS_PCI;
1147 dev_info->num_regions = VFIO_PCI_NUM_REGIONS;
1148 dev_info->num_irqs = VFIO_PCI_NUM_IRQS;
1149
1150 return 0;
1151 }
1152
1153 static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd,
1154 unsigned long arg)
1155 {
1156 int ret = 0;
1157 unsigned long minsz;
1158 struct mdev_state *mdev_state;
1159
1160 if (!mdev)
1161 return -EINVAL;
1162
1163 mdev_state = mdev_get_drvdata(mdev);
1164 if (!mdev_state)
1165 return -ENODEV;
1166
1167 switch (cmd) {
1168 case VFIO_DEVICE_GET_INFO:
1169 {
1170 struct vfio_device_info info;
1171
1172 minsz = offsetofend(struct vfio_device_info, num_irqs);
1173
1174 if (copy_from_user(&info, (void __user *)arg, minsz))
1175 return -EFAULT;
1176
1177 if (info.argsz < minsz)
1178 return -EINVAL;
1179
1180 ret = mtty_get_device_info(mdev, &info);
1181 if (ret)
1182 return ret;
1183
1184 memcpy(&mdev_state->dev_info, &info, sizeof(info));
1185
1186 if (copy_to_user((void __user *)arg, &info, minsz))
1187 return -EFAULT;
1188
1189 return 0;
1190 }
1191 case VFIO_DEVICE_GET_REGION_INFO:
1192 {
1193 struct vfio_region_info info;
1194 u16 cap_type_id = 0;
1195 void *cap_type = NULL;
1196
1197 minsz = offsetofend(struct vfio_region_info, offset);
1198
1199 if (copy_from_user(&info, (void __user *)arg, minsz))
1200 return -EFAULT;
1201
1202 if (info.argsz < minsz)
1203 return -EINVAL;
1204
1205 ret = mtty_get_region_info(mdev, &info, &cap_type_id,
1206 &cap_type);
1207 if (ret)
1208 return ret;
1209
1210 if (copy_to_user((void __user *)arg, &info, minsz))
1211 return -EFAULT;
1212
1213 return 0;
1214 }
1215
1216 case VFIO_DEVICE_GET_IRQ_INFO:
1217 {
1218 struct vfio_irq_info info;
1219
1220 minsz = offsetofend(struct vfio_irq_info, count);
1221
1222 if (copy_from_user(&info, (void __user *)arg, minsz))
1223 return -EFAULT;
1224
1225 if ((info.argsz < minsz) ||
1226 (info.index >= mdev_state->dev_info.num_irqs))
1227 return -EINVAL;
1228
1229 ret = mtty_get_irq_info(mdev, &info);
1230 if (ret)
1231 return ret;
1232
1233 if (copy_to_user((void __user *)arg, &info, minsz))
1234 return -EFAULT;
1235
1236 return 0;
1237 }
1238 case VFIO_DEVICE_SET_IRQS:
1239 {
1240 struct vfio_irq_set hdr;
1241 u8 *data = NULL, *ptr = NULL;
1242 size_t data_size = 0;
1243
1244 minsz = offsetofend(struct vfio_irq_set, count);
1245
1246 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1247 return -EFAULT;
1248
1249 ret = vfio_set_irqs_validate_and_prepare(&hdr,
1250 mdev_state->dev_info.num_irqs,
1251 VFIO_PCI_NUM_IRQS,
1252 &data_size);
1253 if (ret)
1254 return ret;
1255
1256 if (data_size) {
1257 ptr = data = memdup_user((void __user *)(arg + minsz),
1258 data_size);
1259 if (IS_ERR(data))
1260 return PTR_ERR(data);
1261 }
1262
1263 ret = mtty_set_irqs(mdev, hdr.flags, hdr.index, hdr.start,
1264 hdr.count, data);
1265
1266 kfree(ptr);
1267 return ret;
1268 }
1269 case VFIO_DEVICE_RESET:
1270 return mtty_reset(mdev);
1271 }
1272 return -ENOTTY;
1273 }
1274
1275 int mtty_open(struct mdev_device *mdev)
1276 {
1277 pr_info("%s\n", __func__);
1278 return 0;
1279 }
1280
1281 void mtty_close(struct mdev_device *mdev)
1282 {
1283 pr_info("%s\n", __func__);
1284 }
1285
1286 static ssize_t
1287 sample_mtty_dev_show(struct device *dev, struct device_attribute *attr,
1288 char *buf)
1289 {
1290 return sprintf(buf, "This is phy device\n");
1291 }
1292
1293 static DEVICE_ATTR_RO(sample_mtty_dev);
1294
1295 static struct attribute *mtty_dev_attrs[] = {
1296 &dev_attr_sample_mtty_dev.attr,
1297 NULL,
1298 };
1299
1300 static const struct attribute_group mtty_dev_group = {
1301 .name = "mtty_dev",
1302 .attrs = mtty_dev_attrs,
1303 };
1304
1305 const struct attribute_group *mtty_dev_groups[] = {
1306 &mtty_dev_group,
1307 NULL,
1308 };
1309
1310 static ssize_t
1311 sample_mdev_dev_show(struct device *dev, struct device_attribute *attr,
1312 char *buf)
1313 {
1314 if (mdev_from_dev(dev))
1315 return sprintf(buf, "This is MDEV %s\n", dev_name(dev));
1316
1317 return sprintf(buf, "\n");
1318 }
1319
1320 static DEVICE_ATTR_RO(sample_mdev_dev);
1321
1322 static struct attribute *mdev_dev_attrs[] = {
1323 &dev_attr_sample_mdev_dev.attr,
1324 NULL,
1325 };
1326
1327 static const struct attribute_group mdev_dev_group = {
1328 .name = "vendor",
1329 .attrs = mdev_dev_attrs,
1330 };
1331
1332 const struct attribute_group *mdev_dev_groups[] = {
1333 &mdev_dev_group,
1334 NULL,
1335 };
1336
1337 static ssize_t
1338 name_show(struct kobject *kobj, struct device *dev, char *buf)
1339 {
1340 char name[MTTY_STRING_LEN];
1341 int i;
1342 const char *name_str[2] = {"Single port serial", "Dual port serial"};
1343
1344 for (i = 0; i < 2; i++) {
1345 snprintf(name, MTTY_STRING_LEN, "%s-%d",
1346 dev_driver_string(dev), i + 1);
1347 if (!strcmp(kobj->name, name))
1348 return sprintf(buf, "%s\n", name_str[i]);
1349 }
1350
1351 return -EINVAL;
1352 }
1353
1354 MDEV_TYPE_ATTR_RO(name);
1355
1356 static ssize_t
1357 available_instances_show(struct kobject *kobj, struct device *dev, char *buf)
1358 {
1359 char name[MTTY_STRING_LEN];
1360 int i;
1361 struct mdev_state *mds;
1362 int ports = 0, used = 0;
1363
1364 for (i = 0; i < 2; i++) {
1365 snprintf(name, MTTY_STRING_LEN, "%s-%d",
1366 dev_driver_string(dev), i + 1);
1367 if (!strcmp(kobj->name, name)) {
1368 ports = i + 1;
1369 break;
1370 }
1371 }
1372
1373 if (!ports)
1374 return -EINVAL;
1375
1376 list_for_each_entry(mds, &mdev_devices_list, next)
1377 used += mds->nr_ports;
1378
1379 return sprintf(buf, "%d\n", (MAX_MTTYS - used)/ports);
1380 }
1381
1382 MDEV_TYPE_ATTR_RO(available_instances);
1383
1384
1385 static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
1386 char *buf)
1387 {
1388 return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING);
1389 }
1390
1391 MDEV_TYPE_ATTR_RO(device_api);
1392
1393 static struct attribute *mdev_types_attrs[] = {
1394 &mdev_type_attr_name.attr,
1395 &mdev_type_attr_device_api.attr,
1396 &mdev_type_attr_available_instances.attr,
1397 NULL,
1398 };
1399
1400 static struct attribute_group mdev_type_group1 = {
1401 .name = "1",
1402 .attrs = mdev_types_attrs,
1403 };
1404
1405 static struct attribute_group mdev_type_group2 = {
1406 .name = "2",
1407 .attrs = mdev_types_attrs,
1408 };
1409
1410 struct attribute_group *mdev_type_groups[] = {
1411 &mdev_type_group1,
1412 &mdev_type_group2,
1413 NULL,
1414 };
1415
1416 static const struct mdev_parent_ops mdev_fops = {
1417 .owner = THIS_MODULE,
1418 .dev_attr_groups = mtty_dev_groups,
1419 .mdev_attr_groups = mdev_dev_groups,
1420 .supported_type_groups = mdev_type_groups,
1421 .create = mtty_create,
1422 .remove = mtty_remove,
1423 .open = mtty_open,
1424 .release = mtty_close,
1425 .read = mtty_read,
1426 .write = mtty_write,
1427 .ioctl = mtty_ioctl,
1428 };
1429
1430 static void mtty_device_release(struct device *dev)
1431 {
1432 dev_dbg(dev, "mtty: released\n");
1433 }
1434
1435 static int __init mtty_dev_init(void)
1436 {
1437 int ret = 0;
1438
1439 pr_info("mtty_dev: %s\n", __func__);
1440
1441 memset(&mtty_dev, 0, sizeof(mtty_dev));
1442
1443 idr_init(&mtty_dev.vd_idr);
1444
1445 ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK, MTTY_NAME);
1446
1447 if (ret < 0) {
1448 pr_err("Error: failed to register mtty_dev, err:%d\n", ret);
1449 return ret;
1450 }
1451
1452 cdev_init(&mtty_dev.vd_cdev, &vd_fops);
1453 cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK);
1454
1455 pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt));
1456
1457 mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME);
1458
1459 if (IS_ERR(mtty_dev.vd_class)) {
1460 pr_err("Error: failed to register mtty_dev class\n");
1461 ret = PTR_ERR(mtty_dev.vd_class);
1462 goto failed1;
1463 }
1464
1465 mtty_dev.dev.class = mtty_dev.vd_class;
1466 mtty_dev.dev.release = mtty_device_release;
1467 dev_set_name(&mtty_dev.dev, "%s", MTTY_NAME);
1468
1469 ret = device_register(&mtty_dev.dev);
1470 if (ret)
1471 goto failed2;
1472
1473 ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
1474 if (ret)
1475 goto failed3;
1476
1477 mutex_init(&mdev_list_lock);
1478 INIT_LIST_HEAD(&mdev_devices_list);
1479
1480 goto all_done;
1481
1482 failed3:
1483
1484 device_unregister(&mtty_dev.dev);
1485 failed2:
1486 class_destroy(mtty_dev.vd_class);
1487
1488 failed1:
1489 cdev_del(&mtty_dev.vd_cdev);
1490 unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK);
1491
1492 all_done:
1493 return ret;
1494 }
1495
1496 static void __exit mtty_dev_exit(void)
1497 {
1498 mtty_dev.dev.bus = NULL;
1499 mdev_unregister_device(&mtty_dev.dev);
1500
1501 device_unregister(&mtty_dev.dev);
1502 idr_destroy(&mtty_dev.vd_idr);
1503 cdev_del(&mtty_dev.vd_cdev);
1504 unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK);
1505 class_destroy(mtty_dev.vd_class);
1506 mtty_dev.vd_class = NULL;
1507 pr_info("mtty_dev: Unloaded!\n");
1508 }
1509
1510 module_init(mtty_dev_init)
1511 module_exit(mtty_dev_exit)
1512
1513 MODULE_LICENSE("GPL v2");
1514 MODULE_INFO(supported, "Test driver that simulate serial port over PCI");
1515 MODULE_VERSION(VERSION_STRING);
1516 MODULE_AUTHOR(DRIVER_AUTHOR);
Linux with added FPC-III support