Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9d1a546c KW |
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 | * | |
9d1a546c KW |
9 | * Sample driver that creates mdev device that simulates serial port over PCI |
10 | * card. | |
9d1a546c KW |
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 | ||
4b2dbd56 | 71 | static struct mtty_dev { |
9d1a546c KW |
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) | |
4b2dbd56 | 87 | static const char *wr_reg[] = { |
9d1a546c KW |
88 | "TX", |
89 | "IER", | |
90 | "FCR", | |
91 | "LCR", | |
92 | "MCR", | |
93 | "LSR", | |
94 | "MSR", | |
95 | "SCR" | |
96 | }; | |
97 | ||
4b2dbd56 | 98 | static const char *rd_reg[] = { |
9d1a546c KW |
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 | ||
4b2dbd56 KW |
146 | static struct mutex mdev_list_lock; |
147 | static struct list_head mdev_devices_list; | |
9d1a546c KW |
148 | |
149 | static const struct file_operations vd_fops = { | |
150 | .owner = THIS_MODULE, | |
151 | }; | |
152 | ||
153 | /* function prototypes */ | |
154 | ||
eee413e6 | 155 | static int mtty_trigger_interrupt(struct mdev_state *mdev_state); |
9d1a546c KW |
156 | |
157 | /* Helper functions */ | |
9d1a546c | 158 | |
4b2dbd56 | 159 | static void dump_buffer(u8 *buf, uint32_t count) |
9d1a546c KW |
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, | |
8ba35b3a | 238 | u8 *buf, u32 count) |
9d1a546c KW |
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, | |
8ba35b3a | 292 | u16 offset, u8 *buf, u32 count) |
9d1a546c KW |
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 | |
eee413e6 | 329 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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) | |
eee413e6 | 343 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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 | |
eee413e6 | 362 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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 | |
eee413e6 | 433 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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 | |
eee413e6 | 441 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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, | |
8ba35b3a | 460 | u16 offset, u8 *buf, u32 count) |
9d1a546c KW |
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) | |
eee413e6 | 492 | mtty_trigger_interrupt(mdev_state); |
9d1a546c KW |
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) && | |
c9f89c3f | 518 | (mdev_state->s[index].rxtx.count >= |
9d1a546c KW |
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 | ||
8ba35b3a | 634 | static ssize_t mdev_access(struct mdev_device *mdev, u8 *buf, size_t count, |
9d1a546c KW |
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], | |
8ba35b3a | 682 | *buf, mdev_state->s[index].dlab); |
9d1a546c KW |
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], | |
8ba35b3a | 692 | *buf, mdev_state->s[index].dlab); |
9d1a546c KW |
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 | ||
4b2dbd56 | 711 | static int mtty_create(struct kobject *kobj, struct mdev_device *mdev) |
9d1a546c KW |
712 | { |
713 | struct mdev_state *mdev_state; | |
714 | char name[MTTY_STRING_LEN]; | |
715 | int nr_ports = 0, i; | |
716 | ||
717 | if (!mdev) | |
718 | return -EINVAL; | |
719 | ||
720 | for (i = 0; i < 2; i++) { | |
721 | snprintf(name, MTTY_STRING_LEN, "%s-%d", | |
9372e6fe | 722 | dev_driver_string(mdev_parent_dev(mdev)), i + 1); |
9d1a546c KW |
723 | if (!strcmp(kobj->name, name)) { |
724 | nr_ports = i + 1; | |
725 | break; | |
726 | } | |
727 | } | |
728 | ||
729 | if (!nr_ports) | |
730 | return -EINVAL; | |
731 | ||
732 | mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL); | |
733 | if (mdev_state == NULL) | |
734 | return -ENOMEM; | |
735 | ||
736 | mdev_state->nr_ports = nr_ports; | |
737 | mdev_state->irq_index = -1; | |
738 | mdev_state->s[0].max_fifo_size = MAX_FIFO_SIZE; | |
739 | mdev_state->s[1].max_fifo_size = MAX_FIFO_SIZE; | |
740 | mutex_init(&mdev_state->rxtx_lock); | |
741 | mdev_state->vconfig = kzalloc(MTTY_CONFIG_SPACE_SIZE, GFP_KERNEL); | |
742 | ||
743 | if (mdev_state->vconfig == NULL) { | |
744 | kfree(mdev_state); | |
745 | return -ENOMEM; | |
746 | } | |
747 | ||
748 | mutex_init(&mdev_state->ops_lock); | |
749 | mdev_state->mdev = mdev; | |
750 | mdev_set_drvdata(mdev, mdev_state); | |
751 | ||
752 | mtty_create_config_space(mdev_state); | |
753 | ||
754 | mutex_lock(&mdev_list_lock); | |
755 | list_add(&mdev_state->next, &mdev_devices_list); | |
756 | mutex_unlock(&mdev_list_lock); | |
757 | ||
758 | return 0; | |
759 | } | |
760 | ||
4b2dbd56 | 761 | static int mtty_remove(struct mdev_device *mdev) |
9d1a546c KW |
762 | { |
763 | struct mdev_state *mds, *tmp_mds; | |
764 | struct mdev_state *mdev_state = mdev_get_drvdata(mdev); | |
765 | int ret = -EINVAL; | |
766 | ||
767 | mutex_lock(&mdev_list_lock); | |
768 | list_for_each_entry_safe(mds, tmp_mds, &mdev_devices_list, next) { | |
769 | if (mdev_state == mds) { | |
770 | list_del(&mdev_state->next); | |
771 | mdev_set_drvdata(mdev, NULL); | |
772 | kfree(mdev_state->vconfig); | |
773 | kfree(mdev_state); | |
774 | ret = 0; | |
775 | break; | |
776 | } | |
777 | } | |
778 | mutex_unlock(&mdev_list_lock); | |
779 | ||
780 | return ret; | |
781 | } | |
782 | ||
4b2dbd56 | 783 | static int mtty_reset(struct mdev_device *mdev) |
9d1a546c KW |
784 | { |
785 | struct mdev_state *mdev_state; | |
786 | ||
787 | if (!mdev) | |
788 | return -EINVAL; | |
789 | ||
790 | mdev_state = mdev_get_drvdata(mdev); | |
791 | if (!mdev_state) | |
792 | return -EINVAL; | |
793 | ||
794 | pr_info("%s: called\n", __func__); | |
795 | ||
796 | return 0; | |
797 | } | |
798 | ||
4b2dbd56 KW |
799 | static ssize_t mtty_read(struct mdev_device *mdev, char __user *buf, |
800 | size_t count, loff_t *ppos) | |
9d1a546c KW |
801 | { |
802 | unsigned int done = 0; | |
803 | int ret; | |
804 | ||
805 | while (count) { | |
806 | size_t filled; | |
807 | ||
808 | if (count >= 4 && !(*ppos % 4)) { | |
809 | u32 val; | |
810 | ||
8ba35b3a | 811 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
812 | *ppos, false); |
813 | if (ret <= 0) | |
814 | goto read_err; | |
815 | ||
816 | if (copy_to_user(buf, &val, sizeof(val))) | |
817 | goto read_err; | |
818 | ||
819 | filled = 4; | |
820 | } else if (count >= 2 && !(*ppos % 2)) { | |
821 | u16 val; | |
822 | ||
8ba35b3a | 823 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
824 | *ppos, false); |
825 | if (ret <= 0) | |
826 | goto read_err; | |
827 | ||
828 | if (copy_to_user(buf, &val, sizeof(val))) | |
829 | goto read_err; | |
830 | ||
831 | filled = 2; | |
832 | } else { | |
833 | u8 val; | |
834 | ||
8ba35b3a | 835 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
836 | *ppos, false); |
837 | if (ret <= 0) | |
838 | goto read_err; | |
839 | ||
840 | if (copy_to_user(buf, &val, sizeof(val))) | |
841 | goto read_err; | |
842 | ||
843 | filled = 1; | |
844 | } | |
845 | ||
846 | count -= filled; | |
847 | done += filled; | |
848 | *ppos += filled; | |
849 | buf += filled; | |
850 | } | |
851 | ||
852 | return done; | |
853 | ||
854 | read_err: | |
855 | return -EFAULT; | |
856 | } | |
857 | ||
4b2dbd56 | 858 | static ssize_t mtty_write(struct mdev_device *mdev, const char __user *buf, |
9d1a546c KW |
859 | size_t count, loff_t *ppos) |
860 | { | |
861 | unsigned int done = 0; | |
862 | int ret; | |
863 | ||
864 | while (count) { | |
865 | size_t filled; | |
866 | ||
867 | if (count >= 4 && !(*ppos % 4)) { | |
868 | u32 val; | |
869 | ||
870 | if (copy_from_user(&val, buf, sizeof(val))) | |
871 | goto write_err; | |
872 | ||
8ba35b3a | 873 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
874 | *ppos, true); |
875 | if (ret <= 0) | |
876 | goto write_err; | |
877 | ||
878 | filled = 4; | |
879 | } else if (count >= 2 && !(*ppos % 2)) { | |
880 | u16 val; | |
881 | ||
882 | if (copy_from_user(&val, buf, sizeof(val))) | |
883 | goto write_err; | |
884 | ||
8ba35b3a | 885 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
886 | *ppos, true); |
887 | if (ret <= 0) | |
888 | goto write_err; | |
889 | ||
890 | filled = 2; | |
891 | } else { | |
892 | u8 val; | |
893 | ||
894 | if (copy_from_user(&val, buf, sizeof(val))) | |
895 | goto write_err; | |
896 | ||
8ba35b3a | 897 | ret = mdev_access(mdev, (u8 *)&val, sizeof(val), |
9d1a546c KW |
898 | *ppos, true); |
899 | if (ret <= 0) | |
900 | goto write_err; | |
901 | ||
902 | filled = 1; | |
903 | } | |
904 | count -= filled; | |
905 | done += filled; | |
906 | *ppos += filled; | |
907 | buf += filled; | |
908 | } | |
909 | ||
910 | return done; | |
911 | write_err: | |
912 | return -EFAULT; | |
913 | } | |
914 | ||
915 | static int mtty_set_irqs(struct mdev_device *mdev, uint32_t flags, | |
916 | unsigned int index, unsigned int start, | |
917 | unsigned int count, void *data) | |
918 | { | |
919 | int ret = 0; | |
920 | struct mdev_state *mdev_state; | |
921 | ||
922 | if (!mdev) | |
923 | return -EINVAL; | |
924 | ||
925 | mdev_state = mdev_get_drvdata(mdev); | |
926 | if (!mdev_state) | |
927 | return -EINVAL; | |
928 | ||
929 | mutex_lock(&mdev_state->ops_lock); | |
930 | switch (index) { | |
931 | case VFIO_PCI_INTX_IRQ_INDEX: | |
932 | switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { | |
933 | case VFIO_IRQ_SET_ACTION_MASK: | |
934 | case VFIO_IRQ_SET_ACTION_UNMASK: | |
935 | break; | |
936 | case VFIO_IRQ_SET_ACTION_TRIGGER: | |
937 | { | |
938 | if (flags & VFIO_IRQ_SET_DATA_NONE) { | |
939 | pr_info("%s: disable INTx\n", __func__); | |
940 | if (mdev_state->intx_evtfd) | |
941 | eventfd_ctx_put(mdev_state->intx_evtfd); | |
942 | break; | |
943 | } | |
944 | ||
945 | if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { | |
946 | int fd = *(int *)data; | |
947 | ||
948 | if (fd > 0) { | |
949 | struct eventfd_ctx *evt; | |
950 | ||
951 | evt = eventfd_ctx_fdget(fd); | |
952 | if (IS_ERR(evt)) { | |
953 | ret = PTR_ERR(evt); | |
954 | break; | |
955 | } | |
956 | mdev_state->intx_evtfd = evt; | |
957 | mdev_state->irq_fd = fd; | |
958 | mdev_state->irq_index = index; | |
959 | break; | |
960 | } | |
961 | } | |
962 | break; | |
963 | } | |
964 | } | |
965 | break; | |
966 | case VFIO_PCI_MSI_IRQ_INDEX: | |
967 | switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { | |
968 | case VFIO_IRQ_SET_ACTION_MASK: | |
969 | case VFIO_IRQ_SET_ACTION_UNMASK: | |
970 | break; | |
971 | case VFIO_IRQ_SET_ACTION_TRIGGER: | |
972 | if (flags & VFIO_IRQ_SET_DATA_NONE) { | |
973 | if (mdev_state->msi_evtfd) | |
974 | eventfd_ctx_put(mdev_state->msi_evtfd); | |
975 | pr_info("%s: disable MSI\n", __func__); | |
976 | mdev_state->irq_index = VFIO_PCI_INTX_IRQ_INDEX; | |
977 | break; | |
978 | } | |
979 | if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { | |
980 | int fd = *(int *)data; | |
981 | struct eventfd_ctx *evt; | |
982 | ||
983 | if (fd <= 0) | |
984 | break; | |
985 | ||
986 | if (mdev_state->msi_evtfd) | |
987 | break; | |
988 | ||
989 | evt = eventfd_ctx_fdget(fd); | |
990 | if (IS_ERR(evt)) { | |
991 | ret = PTR_ERR(evt); | |
992 | break; | |
993 | } | |
994 | mdev_state->msi_evtfd = evt; | |
995 | mdev_state->irq_fd = fd; | |
996 | mdev_state->irq_index = index; | |
997 | } | |
998 | break; | |
999 | } | |
1000 | break; | |
1001 | case VFIO_PCI_MSIX_IRQ_INDEX: | |
1002 | pr_info("%s: MSIX_IRQ\n", __func__); | |
1003 | break; | |
1004 | case VFIO_PCI_ERR_IRQ_INDEX: | |
1005 | pr_info("%s: ERR_IRQ\n", __func__); | |
1006 | break; | |
1007 | case VFIO_PCI_REQ_IRQ_INDEX: | |
1008 | pr_info("%s: REQ_IRQ\n", __func__); | |
1009 | break; | |
1010 | } | |
1011 | ||
1012 | mutex_unlock(&mdev_state->ops_lock); | |
1013 | return ret; | |
1014 | } | |
1015 | ||
eee413e6 | 1016 | static int mtty_trigger_interrupt(struct mdev_state *mdev_state) |
9d1a546c KW |
1017 | { |
1018 | int ret = -1; | |
9d1a546c KW |
1019 | |
1020 | if ((mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) && | |
1021 | (!mdev_state->msi_evtfd)) | |
1022 | return -EINVAL; | |
1023 | else if ((mdev_state->irq_index == VFIO_PCI_INTX_IRQ_INDEX) && | |
1024 | (!mdev_state->intx_evtfd)) { | |
1025 | pr_info("%s: Intr eventfd not found\n", __func__); | |
1026 | return -EINVAL; | |
1027 | } | |
1028 | ||
1029 | if (mdev_state->irq_index == VFIO_PCI_MSI_IRQ_INDEX) | |
1030 | ret = eventfd_signal(mdev_state->msi_evtfd, 1); | |
1031 | else | |
1032 | ret = eventfd_signal(mdev_state->intx_evtfd, 1); | |
1033 | ||
1034 | #if defined(DEBUG_INTR) | |
1035 | pr_info("Intx triggered\n"); | |
1036 | #endif | |
1037 | if (ret != 1) | |
1038 | pr_err("%s: eventfd signal failed (%d)\n", __func__, ret); | |
1039 | ||
1040 | return ret; | |
1041 | } | |
1042 | ||
4b2dbd56 | 1043 | static int mtty_get_region_info(struct mdev_device *mdev, |
9d1a546c KW |
1044 | struct vfio_region_info *region_info, |
1045 | u16 *cap_type_id, void **cap_type) | |
1046 | { | |
1047 | unsigned int size = 0; | |
1048 | struct mdev_state *mdev_state; | |
5c677869 | 1049 | u32 bar_index; |
9d1a546c KW |
1050 | |
1051 | if (!mdev) | |
1052 | return -EINVAL; | |
1053 | ||
1054 | mdev_state = mdev_get_drvdata(mdev); | |
1055 | if (!mdev_state) | |
1056 | return -EINVAL; | |
1057 | ||
9d1a546c | 1058 | bar_index = region_info->index; |
5c677869 DC |
1059 | if (bar_index >= VFIO_PCI_NUM_REGIONS) |
1060 | return -EINVAL; | |
1061 | ||
1062 | mutex_lock(&mdev_state->ops_lock); | |
9d1a546c KW |
1063 | |
1064 | switch (bar_index) { | |
1065 | case VFIO_PCI_CONFIG_REGION_INDEX: | |
1066 | size = MTTY_CONFIG_SPACE_SIZE; | |
1067 | break; | |
1068 | case VFIO_PCI_BAR0_REGION_INDEX: | |
1069 | size = MTTY_IO_BAR_SIZE; | |
1070 | break; | |
1071 | case VFIO_PCI_BAR1_REGION_INDEX: | |
1072 | if (mdev_state->nr_ports == 2) | |
1073 | size = MTTY_IO_BAR_SIZE; | |
1074 | break; | |
1075 | default: | |
1076 | size = 0; | |
1077 | break; | |
1078 | } | |
1079 | ||
1080 | mdev_state->region_info[bar_index].size = size; | |
1081 | mdev_state->region_info[bar_index].vfio_offset = | |
1082 | MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index); | |
1083 | ||
1084 | region_info->size = size; | |
1085 | region_info->offset = MTTY_VFIO_PCI_INDEX_TO_OFFSET(bar_index); | |
1086 | region_info->flags = VFIO_REGION_INFO_FLAG_READ | | |
1087 | VFIO_REGION_INFO_FLAG_WRITE; | |
1088 | mutex_unlock(&mdev_state->ops_lock); | |
1089 | return 0; | |
1090 | } | |
1091 | ||
4b2dbd56 KW |
1092 | static int mtty_get_irq_info(struct mdev_device *mdev, |
1093 | struct vfio_irq_info *irq_info) | |
9d1a546c KW |
1094 | { |
1095 | switch (irq_info->index) { | |
1096 | case VFIO_PCI_INTX_IRQ_INDEX: | |
1097 | case VFIO_PCI_MSI_IRQ_INDEX: | |
1098 | case VFIO_PCI_REQ_IRQ_INDEX: | |
1099 | break; | |
1100 | ||
1101 | default: | |
1102 | return -EINVAL; | |
1103 | } | |
1104 | ||
1105 | irq_info->flags = VFIO_IRQ_INFO_EVENTFD; | |
1106 | irq_info->count = 1; | |
1107 | ||
1108 | if (irq_info->index == VFIO_PCI_INTX_IRQ_INDEX) | |
1109 | irq_info->flags |= (VFIO_IRQ_INFO_MASKABLE | | |
1110 | VFIO_IRQ_INFO_AUTOMASKED); | |
1111 | else | |
1112 | irq_info->flags |= VFIO_IRQ_INFO_NORESIZE; | |
1113 | ||
1114 | return 0; | |
1115 | } | |
1116 | ||
4b2dbd56 | 1117 | static int mtty_get_device_info(struct mdev_device *mdev, |
9d1a546c KW |
1118 | struct vfio_device_info *dev_info) |
1119 | { | |
1120 | dev_info->flags = VFIO_DEVICE_FLAGS_PCI; | |
1121 | dev_info->num_regions = VFIO_PCI_NUM_REGIONS; | |
1122 | dev_info->num_irqs = VFIO_PCI_NUM_IRQS; | |
1123 | ||
1124 | return 0; | |
1125 | } | |
1126 | ||
1127 | static long mtty_ioctl(struct mdev_device *mdev, unsigned int cmd, | |
1128 | unsigned long arg) | |
1129 | { | |
1130 | int ret = 0; | |
1131 | unsigned long minsz; | |
1132 | struct mdev_state *mdev_state; | |
1133 | ||
1134 | if (!mdev) | |
1135 | return -EINVAL; | |
1136 | ||
1137 | mdev_state = mdev_get_drvdata(mdev); | |
1138 | if (!mdev_state) | |
1139 | return -ENODEV; | |
1140 | ||
1141 | switch (cmd) { | |
1142 | case VFIO_DEVICE_GET_INFO: | |
1143 | { | |
1144 | struct vfio_device_info info; | |
1145 | ||
1146 | minsz = offsetofend(struct vfio_device_info, num_irqs); | |
1147 | ||
1148 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1149 | return -EFAULT; | |
1150 | ||
1151 | if (info.argsz < minsz) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | ret = mtty_get_device_info(mdev, &info); | |
1155 | if (ret) | |
1156 | return ret; | |
1157 | ||
1158 | memcpy(&mdev_state->dev_info, &info, sizeof(info)); | |
1159 | ||
6ed0993a DC |
1160 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1161 | return -EFAULT; | |
1162 | ||
1163 | return 0; | |
9d1a546c KW |
1164 | } |
1165 | case VFIO_DEVICE_GET_REGION_INFO: | |
1166 | { | |
1167 | struct vfio_region_info info; | |
1168 | u16 cap_type_id = 0; | |
1169 | void *cap_type = NULL; | |
1170 | ||
1171 | minsz = offsetofend(struct vfio_region_info, offset); | |
1172 | ||
1173 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1174 | return -EFAULT; | |
1175 | ||
1176 | if (info.argsz < minsz) | |
1177 | return -EINVAL; | |
1178 | ||
1179 | ret = mtty_get_region_info(mdev, &info, &cap_type_id, | |
1180 | &cap_type); | |
1181 | if (ret) | |
1182 | return ret; | |
1183 | ||
6ed0993a DC |
1184 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1185 | return -EFAULT; | |
1186 | ||
1187 | return 0; | |
9d1a546c KW |
1188 | } |
1189 | ||
1190 | case VFIO_DEVICE_GET_IRQ_INFO: | |
1191 | { | |
1192 | struct vfio_irq_info info; | |
1193 | ||
1194 | minsz = offsetofend(struct vfio_irq_info, count); | |
1195 | ||
1196 | if (copy_from_user(&info, (void __user *)arg, minsz)) | |
1197 | return -EFAULT; | |
1198 | ||
1199 | if ((info.argsz < minsz) || | |
1200 | (info.index >= mdev_state->dev_info.num_irqs)) | |
1201 | return -EINVAL; | |
1202 | ||
1203 | ret = mtty_get_irq_info(mdev, &info); | |
1204 | if (ret) | |
1205 | return ret; | |
1206 | ||
6ed0993a DC |
1207 | if (copy_to_user((void __user *)arg, &info, minsz)) |
1208 | return -EFAULT; | |
1209 | ||
1210 | return 0; | |
9d1a546c KW |
1211 | } |
1212 | case VFIO_DEVICE_SET_IRQS: | |
1213 | { | |
1214 | struct vfio_irq_set hdr; | |
1215 | u8 *data = NULL, *ptr = NULL; | |
1216 | size_t data_size = 0; | |
1217 | ||
1218 | minsz = offsetofend(struct vfio_irq_set, count); | |
1219 | ||
1220 | if (copy_from_user(&hdr, (void __user *)arg, minsz)) | |
1221 | return -EFAULT; | |
1222 | ||
1223 | ret = vfio_set_irqs_validate_and_prepare(&hdr, | |
1224 | mdev_state->dev_info.num_irqs, | |
1225 | VFIO_PCI_NUM_IRQS, | |
1226 | &data_size); | |
1227 | if (ret) | |
1228 | return ret; | |
1229 | ||
1230 | if (data_size) { | |
1231 | ptr = data = memdup_user((void __user *)(arg + minsz), | |
1232 | data_size); | |
1233 | if (IS_ERR(data)) | |
1234 | return PTR_ERR(data); | |
1235 | } | |
1236 | ||
1237 | ret = mtty_set_irqs(mdev, hdr.flags, hdr.index, hdr.start, | |
1238 | hdr.count, data); | |
1239 | ||
1240 | kfree(ptr); | |
1241 | return ret; | |
1242 | } | |
1243 | case VFIO_DEVICE_RESET: | |
1244 | return mtty_reset(mdev); | |
1245 | } | |
1246 | return -ENOTTY; | |
1247 | } | |
1248 | ||
4b2dbd56 | 1249 | static int mtty_open(struct mdev_device *mdev) |
9d1a546c KW |
1250 | { |
1251 | pr_info("%s\n", __func__); | |
1252 | return 0; | |
1253 | } | |
1254 | ||
4b2dbd56 | 1255 | static void mtty_close(struct mdev_device *mdev) |
9d1a546c KW |
1256 | { |
1257 | pr_info("%s\n", __func__); | |
1258 | } | |
1259 | ||
1260 | static ssize_t | |
1261 | sample_mtty_dev_show(struct device *dev, struct device_attribute *attr, | |
1262 | char *buf) | |
1263 | { | |
1264 | return sprintf(buf, "This is phy device\n"); | |
1265 | } | |
1266 | ||
1267 | static DEVICE_ATTR_RO(sample_mtty_dev); | |
1268 | ||
1269 | static struct attribute *mtty_dev_attrs[] = { | |
1270 | &dev_attr_sample_mtty_dev.attr, | |
1271 | NULL, | |
1272 | }; | |
1273 | ||
1274 | static const struct attribute_group mtty_dev_group = { | |
1275 | .name = "mtty_dev", | |
1276 | .attrs = mtty_dev_attrs, | |
1277 | }; | |
1278 | ||
4b2dbd56 | 1279 | static const struct attribute_group *mtty_dev_groups[] = { |
9d1a546c KW |
1280 | &mtty_dev_group, |
1281 | NULL, | |
1282 | }; | |
1283 | ||
1284 | static ssize_t | |
1285 | sample_mdev_dev_show(struct device *dev, struct device_attribute *attr, | |
1286 | char *buf) | |
1287 | { | |
99e3123e AW |
1288 | if (mdev_from_dev(dev)) |
1289 | return sprintf(buf, "This is MDEV %s\n", dev_name(dev)); | |
9d1a546c KW |
1290 | |
1291 | return sprintf(buf, "\n"); | |
1292 | } | |
1293 | ||
1294 | static DEVICE_ATTR_RO(sample_mdev_dev); | |
1295 | ||
1296 | static struct attribute *mdev_dev_attrs[] = { | |
1297 | &dev_attr_sample_mdev_dev.attr, | |
1298 | NULL, | |
1299 | }; | |
1300 | ||
1301 | static const struct attribute_group mdev_dev_group = { | |
1302 | .name = "vendor", | |
1303 | .attrs = mdev_dev_attrs, | |
1304 | }; | |
1305 | ||
4b2dbd56 | 1306 | static const struct attribute_group *mdev_dev_groups[] = { |
9d1a546c KW |
1307 | &mdev_dev_group, |
1308 | NULL, | |
1309 | }; | |
1310 | ||
1311 | static ssize_t | |
1312 | name_show(struct kobject *kobj, struct device *dev, char *buf) | |
1313 | { | |
1314 | char name[MTTY_STRING_LEN]; | |
1315 | int i; | |
1316 | const char *name_str[2] = {"Single port serial", "Dual port serial"}; | |
1317 | ||
1318 | for (i = 0; i < 2; i++) { | |
1319 | snprintf(name, MTTY_STRING_LEN, "%s-%d", | |
1320 | dev_driver_string(dev), i + 1); | |
1321 | if (!strcmp(kobj->name, name)) | |
1322 | return sprintf(buf, "%s\n", name_str[i]); | |
1323 | } | |
1324 | ||
1325 | return -EINVAL; | |
1326 | } | |
1327 | ||
4b2dbd56 | 1328 | static MDEV_TYPE_ATTR_RO(name); |
9d1a546c KW |
1329 | |
1330 | static ssize_t | |
1331 | available_instances_show(struct kobject *kobj, struct device *dev, char *buf) | |
1332 | { | |
1333 | char name[MTTY_STRING_LEN]; | |
1334 | int i; | |
1335 | struct mdev_state *mds; | |
1336 | int ports = 0, used = 0; | |
1337 | ||
1338 | for (i = 0; i < 2; i++) { | |
1339 | snprintf(name, MTTY_STRING_LEN, "%s-%d", | |
1340 | dev_driver_string(dev), i + 1); | |
1341 | if (!strcmp(kobj->name, name)) { | |
1342 | ports = i + 1; | |
1343 | break; | |
1344 | } | |
1345 | } | |
1346 | ||
1347 | if (!ports) | |
1348 | return -EINVAL; | |
1349 | ||
1350 | list_for_each_entry(mds, &mdev_devices_list, next) | |
1351 | used += mds->nr_ports; | |
1352 | ||
1353 | return sprintf(buf, "%d\n", (MAX_MTTYS - used)/ports); | |
1354 | } | |
1355 | ||
4b2dbd56 | 1356 | static MDEV_TYPE_ATTR_RO(available_instances); |
9d1a546c KW |
1357 | |
1358 | ||
1359 | static ssize_t device_api_show(struct kobject *kobj, struct device *dev, | |
1360 | char *buf) | |
1361 | { | |
1362 | return sprintf(buf, "%s\n", VFIO_DEVICE_API_PCI_STRING); | |
1363 | } | |
1364 | ||
4b2dbd56 | 1365 | static MDEV_TYPE_ATTR_RO(device_api); |
9d1a546c KW |
1366 | |
1367 | static struct attribute *mdev_types_attrs[] = { | |
1368 | &mdev_type_attr_name.attr, | |
1369 | &mdev_type_attr_device_api.attr, | |
1370 | &mdev_type_attr_available_instances.attr, | |
1371 | NULL, | |
1372 | }; | |
1373 | ||
1374 | static struct attribute_group mdev_type_group1 = { | |
1375 | .name = "1", | |
1376 | .attrs = mdev_types_attrs, | |
1377 | }; | |
1378 | ||
1379 | static struct attribute_group mdev_type_group2 = { | |
1380 | .name = "2", | |
1381 | .attrs = mdev_types_attrs, | |
1382 | }; | |
1383 | ||
4b2dbd56 | 1384 | static struct attribute_group *mdev_type_groups[] = { |
9d1a546c KW |
1385 | &mdev_type_group1, |
1386 | &mdev_type_group2, | |
1387 | NULL, | |
1388 | }; | |
1389 | ||
79d40370 | 1390 | static const struct mdev_parent_ops mdev_fops = { |
9d1a546c KW |
1391 | .owner = THIS_MODULE, |
1392 | .dev_attr_groups = mtty_dev_groups, | |
1393 | .mdev_attr_groups = mdev_dev_groups, | |
1394 | .supported_type_groups = mdev_type_groups, | |
1395 | .create = mtty_create, | |
1396 | .remove = mtty_remove, | |
1397 | .open = mtty_open, | |
1398 | .release = mtty_close, | |
1399 | .read = mtty_read, | |
1400 | .write = mtty_write, | |
1401 | .ioctl = mtty_ioctl, | |
1402 | }; | |
1403 | ||
1404 | static void mtty_device_release(struct device *dev) | |
1405 | { | |
1406 | dev_dbg(dev, "mtty: released\n"); | |
1407 | } | |
1408 | ||
1409 | static int __init mtty_dev_init(void) | |
1410 | { | |
1411 | int ret = 0; | |
1412 | ||
1413 | pr_info("mtty_dev: %s\n", __func__); | |
1414 | ||
1415 | memset(&mtty_dev, 0, sizeof(mtty_dev)); | |
1416 | ||
1417 | idr_init(&mtty_dev.vd_idr); | |
1418 | ||
3e4835f7 CX |
1419 | ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK + 1, |
1420 | MTTY_NAME); | |
9d1a546c KW |
1421 | |
1422 | if (ret < 0) { | |
1423 | pr_err("Error: failed to register mtty_dev, err:%d\n", ret); | |
1424 | return ret; | |
1425 | } | |
1426 | ||
1427 | cdev_init(&mtty_dev.vd_cdev, &vd_fops); | |
3e4835f7 | 1428 | cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK + 1); |
9d1a546c KW |
1429 | |
1430 | pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt)); | |
1431 | ||
1432 | mtty_dev.vd_class = class_create(THIS_MODULE, MTTY_CLASS_NAME); | |
1433 | ||
1434 | if (IS_ERR(mtty_dev.vd_class)) { | |
1435 | pr_err("Error: failed to register mtty_dev class\n"); | |
d293dbaa | 1436 | ret = PTR_ERR(mtty_dev.vd_class); |
9d1a546c KW |
1437 | goto failed1; |
1438 | } | |
1439 | ||
1440 | mtty_dev.dev.class = mtty_dev.vd_class; | |
1441 | mtty_dev.dev.release = mtty_device_release; | |
1442 | dev_set_name(&mtty_dev.dev, "%s", MTTY_NAME); | |
1443 | ||
1444 | ret = device_register(&mtty_dev.dev); | |
1445 | if (ret) | |
1446 | goto failed2; | |
1447 | ||
d293dbaa DC |
1448 | ret = mdev_register_device(&mtty_dev.dev, &mdev_fops); |
1449 | if (ret) | |
9d1a546c KW |
1450 | goto failed3; |
1451 | ||
1452 | mutex_init(&mdev_list_lock); | |
1453 | INIT_LIST_HEAD(&mdev_devices_list); | |
1454 | ||
1455 | goto all_done; | |
1456 | ||
1457 | failed3: | |
1458 | ||
1459 | device_unregister(&mtty_dev.dev); | |
1460 | failed2: | |
1461 | class_destroy(mtty_dev.vd_class); | |
1462 | ||
1463 | failed1: | |
1464 | cdev_del(&mtty_dev.vd_cdev); | |
3e4835f7 | 1465 | unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); |
9d1a546c KW |
1466 | |
1467 | all_done: | |
1468 | return ret; | |
1469 | } | |
1470 | ||
1471 | static void __exit mtty_dev_exit(void) | |
1472 | { | |
1473 | mtty_dev.dev.bus = NULL; | |
1474 | mdev_unregister_device(&mtty_dev.dev); | |
1475 | ||
1476 | device_unregister(&mtty_dev.dev); | |
1477 | idr_destroy(&mtty_dev.vd_idr); | |
1478 | cdev_del(&mtty_dev.vd_cdev); | |
3e4835f7 | 1479 | unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); |
9d1a546c KW |
1480 | class_destroy(mtty_dev.vd_class); |
1481 | mtty_dev.vd_class = NULL; | |
1482 | pr_info("mtty_dev: Unloaded!\n"); | |
1483 | } | |
1484 | ||
1485 | module_init(mtty_dev_init) | |
1486 | module_exit(mtty_dev_exit) | |
1487 | ||
1488 | MODULE_LICENSE("GPL v2"); | |
1489 | MODULE_INFO(supported, "Test driver that simulate serial port over PCI"); | |
1490 | MODULE_VERSION(VERSION_STRING); | |
1491 | MODULE_AUTHOR(DRIVER_AUTHOR); |