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Commit | Line | Data |
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6cbf4c8c CM |
1 | /* |
2 | * Inter-VM Shared Memory PCI device. | |
3 | * | |
4 | * Author: | |
5 | * Cam Macdonell <cam@cs.ualberta.ca> | |
6 | * | |
7 | * Based On: cirrus_vga.c | |
8 | * Copyright (c) 2004 Fabrice Bellard | |
9 | * Copyright (c) 2004 Makoto Suzuki (suzu) | |
10 | * | |
11 | * and rtl8139.c | |
12 | * Copyright (c) 2006 Igor Kovalenko | |
13 | * | |
14 | * This code is licensed under the GNU GPL v2. | |
6b620ca3 PB |
15 | * |
16 | * Contributions after 2012-01-13 are licensed under the terms of the | |
17 | * GNU GPL, version 2 or (at your option) any later version. | |
6cbf4c8c CM |
18 | */ |
19 | #include "hw.h" | |
20 | #include "pc.h" | |
a2cb15b0 MT |
21 | #include "pci/pci.h" |
22 | #include "pci/msix.h" | |
9c17d615 | 23 | #include "sysemu/kvm.h" |
caf71f86 | 24 | #include "migration/migration.h" |
7b1b5d19 | 25 | #include "qapi/qmp/qerror.h" |
1de7afc9 | 26 | #include "qemu/event_notifier.h" |
927d4878 | 27 | #include "char/char.h" |
6cbf4c8c CM |
28 | |
29 | #include <sys/mman.h> | |
30 | #include <sys/types.h> | |
31 | ||
32 | #define IVSHMEM_IOEVENTFD 0 | |
33 | #define IVSHMEM_MSI 1 | |
34 | ||
35 | #define IVSHMEM_PEER 0 | |
36 | #define IVSHMEM_MASTER 1 | |
37 | ||
38 | #define IVSHMEM_REG_BAR_SIZE 0x100 | |
39 | ||
40 | //#define DEBUG_IVSHMEM | |
41 | #ifdef DEBUG_IVSHMEM | |
42 | #define IVSHMEM_DPRINTF(fmt, ...) \ | |
43 | do {printf("IVSHMEM: " fmt, ## __VA_ARGS__); } while (0) | |
44 | #else | |
45 | #define IVSHMEM_DPRINTF(fmt, ...) | |
46 | #endif | |
47 | ||
48 | typedef struct Peer { | |
49 | int nb_eventfds; | |
563027cc | 50 | EventNotifier *eventfds; |
6cbf4c8c CM |
51 | } Peer; |
52 | ||
53 | typedef struct EventfdEntry { | |
54 | PCIDevice *pdev; | |
55 | int vector; | |
56 | } EventfdEntry; | |
57 | ||
58 | typedef struct IVShmemState { | |
59 | PCIDevice dev; | |
60 | uint32_t intrmask; | |
61 | uint32_t intrstatus; | |
62 | uint32_t doorbell; | |
63 | ||
64 | CharDriverState **eventfd_chr; | |
65 | CharDriverState *server_chr; | |
cb06608e | 66 | MemoryRegion ivshmem_mmio; |
6cbf4c8c | 67 | |
cb06608e AK |
68 | /* We might need to register the BAR before we actually have the memory. |
69 | * So prepare a container MemoryRegion for the BAR immediately and | |
70 | * add a subregion when we have the memory. | |
71 | */ | |
72 | MemoryRegion bar; | |
73 | MemoryRegion ivshmem; | |
6cbf4c8c | 74 | uint64_t ivshmem_size; /* size of shared memory region */ |
c08ba66f GH |
75 | uint32_t ivshmem_attr; |
76 | uint32_t ivshmem_64bit; | |
6cbf4c8c CM |
77 | int shm_fd; /* shared memory file descriptor */ |
78 | ||
79 | Peer *peers; | |
80 | int nb_peers; /* how many guests we have space for */ | |
81 | int max_peer; /* maximum numbered peer */ | |
82 | ||
83 | int vm_id; | |
84 | uint32_t vectors; | |
85 | uint32_t features; | |
86 | EventfdEntry *eventfd_table; | |
87 | ||
38e0735e AL |
88 | Error *migration_blocker; |
89 | ||
6cbf4c8c CM |
90 | char * shmobj; |
91 | char * sizearg; | |
92 | char * role; | |
93 | int role_val; /* scalar to avoid multiple string comparisons */ | |
94 | } IVShmemState; | |
95 | ||
96 | /* registers for the Inter-VM shared memory device */ | |
97 | enum ivshmem_registers { | |
98 | INTRMASK = 0, | |
99 | INTRSTATUS = 4, | |
100 | IVPOSITION = 8, | |
101 | DOORBELL = 12, | |
102 | }; | |
103 | ||
104 | static inline uint32_t ivshmem_has_feature(IVShmemState *ivs, | |
105 | unsigned int feature) { | |
106 | return (ivs->features & (1 << feature)); | |
107 | } | |
108 | ||
109 | static inline bool is_power_of_two(uint64_t x) { | |
110 | return (x & (x - 1)) == 0; | |
111 | } | |
112 | ||
6cbf4c8c CM |
113 | /* accessing registers - based on rtl8139 */ |
114 | static void ivshmem_update_irq(IVShmemState *s, int val) | |
115 | { | |
116 | int isr; | |
117 | isr = (s->intrstatus & s->intrmask) & 0xffffffff; | |
118 | ||
119 | /* don't print ISR resets */ | |
120 | if (isr) { | |
121 | IVSHMEM_DPRINTF("Set IRQ to %d (%04x %04x)\n", | |
122 | isr ? 1 : 0, s->intrstatus, s->intrmask); | |
123 | } | |
124 | ||
125 | qemu_set_irq(s->dev.irq[0], (isr != 0)); | |
126 | } | |
127 | ||
128 | static void ivshmem_IntrMask_write(IVShmemState *s, uint32_t val) | |
129 | { | |
130 | IVSHMEM_DPRINTF("IntrMask write(w) val = 0x%04x\n", val); | |
131 | ||
132 | s->intrmask = val; | |
133 | ||
134 | ivshmem_update_irq(s, val); | |
135 | } | |
136 | ||
137 | static uint32_t ivshmem_IntrMask_read(IVShmemState *s) | |
138 | { | |
139 | uint32_t ret = s->intrmask; | |
140 | ||
141 | IVSHMEM_DPRINTF("intrmask read(w) val = 0x%04x\n", ret); | |
142 | ||
143 | return ret; | |
144 | } | |
145 | ||
146 | static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val) | |
147 | { | |
148 | IVSHMEM_DPRINTF("IntrStatus write(w) val = 0x%04x\n", val); | |
149 | ||
150 | s->intrstatus = val; | |
151 | ||
152 | ivshmem_update_irq(s, val); | |
6cbf4c8c CM |
153 | } |
154 | ||
155 | static uint32_t ivshmem_IntrStatus_read(IVShmemState *s) | |
156 | { | |
157 | uint32_t ret = s->intrstatus; | |
158 | ||
159 | /* reading ISR clears all interrupts */ | |
160 | s->intrstatus = 0; | |
161 | ||
162 | ivshmem_update_irq(s, 0); | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
a8170e5e | 167 | static void ivshmem_io_write(void *opaque, hwaddr addr, |
cb06608e | 168 | uint64_t val, unsigned size) |
6cbf4c8c CM |
169 | { |
170 | IVShmemState *s = opaque; | |
171 | ||
6cbf4c8c CM |
172 | uint16_t dest = val >> 16; |
173 | uint16_t vector = val & 0xff; | |
174 | ||
175 | addr &= 0xfc; | |
176 | ||
177 | IVSHMEM_DPRINTF("writing to addr " TARGET_FMT_plx "\n", addr); | |
178 | switch (addr) | |
179 | { | |
180 | case INTRMASK: | |
181 | ivshmem_IntrMask_write(s, val); | |
182 | break; | |
183 | ||
184 | case INTRSTATUS: | |
185 | ivshmem_IntrStatus_write(s, val); | |
186 | break; | |
187 | ||
188 | case DOORBELL: | |
189 | /* check that dest VM ID is reasonable */ | |
1b27d7a1 | 190 | if (dest > s->max_peer) { |
6cbf4c8c CM |
191 | IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest); |
192 | break; | |
193 | } | |
194 | ||
195 | /* check doorbell range */ | |
1b27d7a1 | 196 | if (vector < s->peers[dest].nb_eventfds) { |
563027cc PB |
197 | IVSHMEM_DPRINTF("Notifying VM %d on vector %d\n", dest, vector); |
198 | event_notifier_set(&s->peers[dest].eventfds[vector]); | |
6cbf4c8c CM |
199 | } |
200 | break; | |
201 | default: | |
202 | IVSHMEM_DPRINTF("Invalid VM Doorbell VM %d\n", dest); | |
203 | } | |
204 | } | |
205 | ||
a8170e5e | 206 | static uint64_t ivshmem_io_read(void *opaque, hwaddr addr, |
cb06608e | 207 | unsigned size) |
6cbf4c8c CM |
208 | { |
209 | ||
210 | IVShmemState *s = opaque; | |
211 | uint32_t ret; | |
212 | ||
213 | switch (addr) | |
214 | { | |
215 | case INTRMASK: | |
216 | ret = ivshmem_IntrMask_read(s); | |
217 | break; | |
218 | ||
219 | case INTRSTATUS: | |
220 | ret = ivshmem_IntrStatus_read(s); | |
221 | break; | |
222 | ||
223 | case IVPOSITION: | |
224 | /* return my VM ID if the memory is mapped */ | |
225 | if (s->shm_fd > 0) { | |
226 | ret = s->vm_id; | |
227 | } else { | |
228 | ret = -1; | |
229 | } | |
230 | break; | |
231 | ||
232 | default: | |
233 | IVSHMEM_DPRINTF("why are we reading " TARGET_FMT_plx "\n", addr); | |
234 | ret = 0; | |
235 | } | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
cb06608e AK |
240 | static const MemoryRegionOps ivshmem_mmio_ops = { |
241 | .read = ivshmem_io_read, | |
242 | .write = ivshmem_io_write, | |
243 | .endianness = DEVICE_NATIVE_ENDIAN, | |
244 | .impl = { | |
245 | .min_access_size = 4, | |
246 | .max_access_size = 4, | |
247 | }, | |
6cbf4c8c CM |
248 | }; |
249 | ||
250 | static void ivshmem_receive(void *opaque, const uint8_t *buf, int size) | |
251 | { | |
252 | IVShmemState *s = opaque; | |
253 | ||
254 | ivshmem_IntrStatus_write(s, *buf); | |
255 | ||
256 | IVSHMEM_DPRINTF("ivshmem_receive 0x%02x\n", *buf); | |
257 | } | |
258 | ||
259 | static int ivshmem_can_receive(void * opaque) | |
260 | { | |
261 | return 8; | |
262 | } | |
263 | ||
264 | static void ivshmem_event(void *opaque, int event) | |
265 | { | |
266 | IVSHMEM_DPRINTF("ivshmem_event %d\n", event); | |
267 | } | |
268 | ||
269 | static void fake_irqfd(void *opaque, const uint8_t *buf, int size) { | |
270 | ||
271 | EventfdEntry *entry = opaque; | |
272 | PCIDevice *pdev = entry->pdev; | |
273 | ||
274 | IVSHMEM_DPRINTF("interrupt on vector %p %d\n", pdev, entry->vector); | |
275 | msix_notify(pdev, entry->vector); | |
276 | } | |
277 | ||
563027cc PB |
278 | static CharDriverState* create_eventfd_chr_device(void * opaque, EventNotifier *n, |
279 | int vector) | |
6cbf4c8c CM |
280 | { |
281 | /* create a event character device based on the passed eventfd */ | |
282 | IVShmemState *s = opaque; | |
283 | CharDriverState * chr; | |
563027cc | 284 | int eventfd = event_notifier_get_fd(n); |
6cbf4c8c CM |
285 | |
286 | chr = qemu_chr_open_eventfd(eventfd); | |
287 | ||
288 | if (chr == NULL) { | |
289 | fprintf(stderr, "creating eventfd for eventfd %d failed\n", eventfd); | |
290 | exit(-1); | |
291 | } | |
292 | ||
293 | /* if MSI is supported we need multiple interrupts */ | |
294 | if (ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
295 | s->eventfd_table[vector].pdev = &s->dev; | |
296 | s->eventfd_table[vector].vector = vector; | |
297 | ||
298 | qemu_chr_add_handlers(chr, ivshmem_can_receive, fake_irqfd, | |
299 | ivshmem_event, &s->eventfd_table[vector]); | |
300 | } else { | |
301 | qemu_chr_add_handlers(chr, ivshmem_can_receive, ivshmem_receive, | |
302 | ivshmem_event, s); | |
303 | } | |
304 | ||
305 | return chr; | |
306 | ||
307 | } | |
308 | ||
309 | static int check_shm_size(IVShmemState *s, int fd) { | |
310 | /* check that the guest isn't going to try and map more memory than the | |
311 | * the object has allocated return -1 to indicate error */ | |
312 | ||
313 | struct stat buf; | |
314 | ||
315 | fstat(fd, &buf); | |
316 | ||
317 | if (s->ivshmem_size > buf.st_size) { | |
ad0a4ac1 AK |
318 | fprintf(stderr, |
319 | "IVSHMEM ERROR: Requested memory size greater" | |
320 | " than shared object size (%" PRIu64 " > %" PRIu64")\n", | |
321 | s->ivshmem_size, (uint64_t)buf.st_size); | |
6cbf4c8c CM |
322 | return -1; |
323 | } else { | |
324 | return 0; | |
325 | } | |
326 | } | |
327 | ||
328 | /* create the shared memory BAR when we are not using the server, so we can | |
329 | * create the BAR and map the memory immediately */ | |
330 | static void create_shared_memory_BAR(IVShmemState *s, int fd) { | |
331 | ||
332 | void * ptr; | |
333 | ||
334 | s->shm_fd = fd; | |
335 | ||
336 | ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
337 | ||
c5705a77 | 338 | memory_region_init_ram_ptr(&s->ivshmem, "ivshmem.bar2", |
cb06608e | 339 | s->ivshmem_size, ptr); |
c5705a77 | 340 | vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
cb06608e | 341 | memory_region_add_subregion(&s->bar, 0, &s->ivshmem); |
6cbf4c8c CM |
342 | |
343 | /* region for shared memory */ | |
c08ba66f | 344 | pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar); |
6cbf4c8c CM |
345 | } |
346 | ||
563027cc PB |
347 | static void ivshmem_add_eventfd(IVShmemState *s, int posn, int i) |
348 | { | |
349 | memory_region_add_eventfd(&s->ivshmem_mmio, | |
350 | DOORBELL, | |
351 | 4, | |
352 | true, | |
353 | (posn << 16) | i, | |
753d5e14 | 354 | &s->peers[posn].eventfds[i]); |
563027cc PB |
355 | } |
356 | ||
357 | static void ivshmem_del_eventfd(IVShmemState *s, int posn, int i) | |
358 | { | |
359 | memory_region_del_eventfd(&s->ivshmem_mmio, | |
360 | DOORBELL, | |
361 | 4, | |
362 | true, | |
363 | (posn << 16) | i, | |
753d5e14 | 364 | &s->peers[posn].eventfds[i]); |
563027cc PB |
365 | } |
366 | ||
6cbf4c8c CM |
367 | static void close_guest_eventfds(IVShmemState *s, int posn) |
368 | { | |
369 | int i, guest_curr_max; | |
370 | ||
98609cd8 PB |
371 | if (!ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) { |
372 | return; | |
373 | } | |
374 | ||
6cbf4c8c CM |
375 | guest_curr_max = s->peers[posn].nb_eventfds; |
376 | ||
b6a1f3a5 | 377 | memory_region_transaction_begin(); |
6cbf4c8c | 378 | for (i = 0; i < guest_curr_max; i++) { |
563027cc | 379 | ivshmem_del_eventfd(s, posn, i); |
b6a1f3a5 PB |
380 | } |
381 | memory_region_transaction_commit(); | |
382 | for (i = 0; i < guest_curr_max; i++) { | |
563027cc | 383 | event_notifier_cleanup(&s->peers[posn].eventfds[i]); |
6cbf4c8c CM |
384 | } |
385 | ||
7267c094 | 386 | g_free(s->peers[posn].eventfds); |
6cbf4c8c CM |
387 | s->peers[posn].nb_eventfds = 0; |
388 | } | |
389 | ||
6cbf4c8c CM |
390 | /* this function increase the dynamic storage need to store data about other |
391 | * guests */ | |
392 | static void increase_dynamic_storage(IVShmemState *s, int new_min_size) { | |
393 | ||
394 | int j, old_nb_alloc; | |
395 | ||
396 | old_nb_alloc = s->nb_peers; | |
397 | ||
398 | while (new_min_size >= s->nb_peers) | |
399 | s->nb_peers = s->nb_peers * 2; | |
400 | ||
401 | IVSHMEM_DPRINTF("bumping storage to %d guests\n", s->nb_peers); | |
7267c094 | 402 | s->peers = g_realloc(s->peers, s->nb_peers * sizeof(Peer)); |
6cbf4c8c CM |
403 | |
404 | /* zero out new pointers */ | |
405 | for (j = old_nb_alloc; j < s->nb_peers; j++) { | |
406 | s->peers[j].eventfds = NULL; | |
407 | s->peers[j].nb_eventfds = 0; | |
408 | } | |
409 | } | |
410 | ||
411 | static void ivshmem_read(void *opaque, const uint8_t * buf, int flags) | |
412 | { | |
413 | IVShmemState *s = opaque; | |
414 | int incoming_fd, tmp_fd; | |
415 | int guest_max_eventfd; | |
416 | long incoming_posn; | |
417 | ||
418 | memcpy(&incoming_posn, buf, sizeof(long)); | |
419 | /* pick off s->server_chr->msgfd and store it, posn should accompany msg */ | |
74c0d6f0 | 420 | tmp_fd = qemu_chr_fe_get_msgfd(s->server_chr); |
6cbf4c8c CM |
421 | IVSHMEM_DPRINTF("posn is %ld, fd is %d\n", incoming_posn, tmp_fd); |
422 | ||
423 | /* make sure we have enough space for this guest */ | |
424 | if (incoming_posn >= s->nb_peers) { | |
425 | increase_dynamic_storage(s, incoming_posn); | |
426 | } | |
427 | ||
428 | if (tmp_fd == -1) { | |
429 | /* if posn is positive and unseen before then this is our posn*/ | |
430 | if ((incoming_posn >= 0) && | |
431 | (s->peers[incoming_posn].eventfds == NULL)) { | |
432 | /* receive our posn */ | |
433 | s->vm_id = incoming_posn; | |
434 | return; | |
435 | } else { | |
436 | /* otherwise an fd == -1 means an existing guest has gone away */ | |
437 | IVSHMEM_DPRINTF("posn %ld has gone away\n", incoming_posn); | |
438 | close_guest_eventfds(s, incoming_posn); | |
439 | return; | |
440 | } | |
441 | } | |
442 | ||
443 | /* because of the implementation of get_msgfd, we need a dup */ | |
444 | incoming_fd = dup(tmp_fd); | |
445 | ||
446 | if (incoming_fd == -1) { | |
447 | fprintf(stderr, "could not allocate file descriptor %s\n", | |
448 | strerror(errno)); | |
449 | return; | |
450 | } | |
451 | ||
452 | /* if the position is -1, then it's shared memory region fd */ | |
453 | if (incoming_posn == -1) { | |
454 | ||
455 | void * map_ptr; | |
456 | ||
457 | s->max_peer = 0; | |
458 | ||
459 | if (check_shm_size(s, incoming_fd) == -1) { | |
460 | exit(-1); | |
461 | } | |
462 | ||
463 | /* mmap the region and map into the BAR2 */ | |
464 | map_ptr = mmap(0, s->ivshmem_size, PROT_READ|PROT_WRITE, MAP_SHARED, | |
465 | incoming_fd, 0); | |
c5705a77 | 466 | memory_region_init_ram_ptr(&s->ivshmem, |
cb06608e | 467 | "ivshmem.bar2", s->ivshmem_size, map_ptr); |
c5705a77 | 468 | vmstate_register_ram(&s->ivshmem, &s->dev.qdev); |
6cbf4c8c | 469 | |
cb06608e | 470 | IVSHMEM_DPRINTF("guest h/w addr = %" PRIu64 ", size = %" PRIu64 "\n", |
6cbf4c8c CM |
471 | s->ivshmem_offset, s->ivshmem_size); |
472 | ||
cb06608e | 473 | memory_region_add_subregion(&s->bar, 0, &s->ivshmem); |
6cbf4c8c CM |
474 | |
475 | /* only store the fd if it is successfully mapped */ | |
476 | s->shm_fd = incoming_fd; | |
477 | ||
478 | return; | |
479 | } | |
480 | ||
481 | /* each guest has an array of eventfds, and we keep track of how many | |
482 | * guests for each VM */ | |
483 | guest_max_eventfd = s->peers[incoming_posn].nb_eventfds; | |
484 | ||
485 | if (guest_max_eventfd == 0) { | |
486 | /* one eventfd per MSI vector */ | |
563027cc | 487 | s->peers[incoming_posn].eventfds = g_new(EventNotifier, s->vectors); |
6cbf4c8c CM |
488 | } |
489 | ||
490 | /* this is an eventfd for a particular guest VM */ | |
491 | IVSHMEM_DPRINTF("eventfds[%ld][%d] = %d\n", incoming_posn, | |
492 | guest_max_eventfd, incoming_fd); | |
563027cc PB |
493 | event_notifier_init_fd(&s->peers[incoming_posn].eventfds[guest_max_eventfd], |
494 | incoming_fd); | |
6cbf4c8c CM |
495 | |
496 | /* increment count for particular guest */ | |
497 | s->peers[incoming_posn].nb_eventfds++; | |
498 | ||
499 | /* keep track of the maximum VM ID */ | |
500 | if (incoming_posn > s->max_peer) { | |
501 | s->max_peer = incoming_posn; | |
502 | } | |
503 | ||
504 | if (incoming_posn == s->vm_id) { | |
505 | s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s, | |
563027cc | 506 | &s->peers[s->vm_id].eventfds[guest_max_eventfd], |
6cbf4c8c CM |
507 | guest_max_eventfd); |
508 | } | |
509 | ||
510 | if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) { | |
563027cc | 511 | ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd); |
6cbf4c8c | 512 | } |
6cbf4c8c CM |
513 | } |
514 | ||
4490c711 MT |
515 | /* Select the MSI-X vectors used by device. |
516 | * ivshmem maps events to vectors statically, so | |
517 | * we just enable all vectors on init and after reset. */ | |
518 | static void ivshmem_use_msix(IVShmemState * s) | |
519 | { | |
520 | int i; | |
521 | ||
522 | if (!msix_present(&s->dev)) { | |
523 | return; | |
524 | } | |
525 | ||
526 | for (i = 0; i < s->vectors; i++) { | |
527 | msix_vector_use(&s->dev, i); | |
528 | } | |
529 | } | |
530 | ||
6cbf4c8c CM |
531 | static void ivshmem_reset(DeviceState *d) |
532 | { | |
533 | IVShmemState *s = DO_UPCAST(IVShmemState, dev.qdev, d); | |
534 | ||
535 | s->intrstatus = 0; | |
4490c711 | 536 | ivshmem_use_msix(s); |
6cbf4c8c CM |
537 | } |
538 | ||
6cbf4c8c CM |
539 | static uint64_t ivshmem_get_size(IVShmemState * s) { |
540 | ||
541 | uint64_t value; | |
542 | char *ptr; | |
543 | ||
544 | value = strtoull(s->sizearg, &ptr, 10); | |
545 | switch (*ptr) { | |
546 | case 0: case 'M': case 'm': | |
547 | value <<= 20; | |
548 | break; | |
549 | case 'G': case 'g': | |
550 | value <<= 30; | |
551 | break; | |
552 | default: | |
553 | fprintf(stderr, "qemu: invalid ram size: %s\n", s->sizearg); | |
554 | exit(1); | |
555 | } | |
556 | ||
557 | /* BARs must be a power of 2 */ | |
558 | if (!is_power_of_two(value)) { | |
559 | fprintf(stderr, "ivshmem: size must be power of 2\n"); | |
560 | exit(1); | |
561 | } | |
562 | ||
563 | return value; | |
564 | } | |
565 | ||
4490c711 MT |
566 | static void ivshmem_setup_msi(IVShmemState * s) |
567 | { | |
1116b539 | 568 | if (msix_init_exclusive_bar(&s->dev, s->vectors, 1)) { |
6cbf4c8c CM |
569 | IVSHMEM_DPRINTF("msix initialization failed\n"); |
570 | exit(1); | |
571 | } | |
572 | ||
1116b539 AW |
573 | IVSHMEM_DPRINTF("msix initialized (%d vectors)\n", s->vectors); |
574 | ||
5cbdb3a3 | 575 | /* allocate QEMU char devices for receiving interrupts */ |
7267c094 | 576 | s->eventfd_table = g_malloc0(s->vectors * sizeof(EventfdEntry)); |
4490c711 MT |
577 | |
578 | ivshmem_use_msix(s); | |
6cbf4c8c CM |
579 | } |
580 | ||
581 | static void ivshmem_save(QEMUFile* f, void *opaque) | |
582 | { | |
583 | IVShmemState *proxy = opaque; | |
584 | ||
585 | IVSHMEM_DPRINTF("ivshmem_save\n"); | |
586 | pci_device_save(&proxy->dev, f); | |
587 | ||
588 | if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) { | |
589 | msix_save(&proxy->dev, f); | |
590 | } else { | |
591 | qemu_put_be32(f, proxy->intrstatus); | |
592 | qemu_put_be32(f, proxy->intrmask); | |
593 | } | |
594 | ||
595 | } | |
596 | ||
597 | static int ivshmem_load(QEMUFile* f, void *opaque, int version_id) | |
598 | { | |
599 | IVSHMEM_DPRINTF("ivshmem_load\n"); | |
600 | ||
601 | IVShmemState *proxy = opaque; | |
4490c711 | 602 | int ret; |
6cbf4c8c CM |
603 | |
604 | if (version_id > 0) { | |
605 | return -EINVAL; | |
606 | } | |
607 | ||
608 | if (proxy->role_val == IVSHMEM_PEER) { | |
609 | fprintf(stderr, "ivshmem: 'peer' devices are not migratable\n"); | |
610 | return -EINVAL; | |
611 | } | |
612 | ||
613 | ret = pci_device_load(&proxy->dev, f); | |
614 | if (ret) { | |
615 | return ret; | |
616 | } | |
617 | ||
618 | if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) { | |
619 | msix_load(&proxy->dev, f); | |
4490c711 | 620 | ivshmem_use_msix(proxy); |
6cbf4c8c CM |
621 | } else { |
622 | proxy->intrstatus = qemu_get_be32(f); | |
623 | proxy->intrmask = qemu_get_be32(f); | |
624 | } | |
625 | ||
626 | return 0; | |
627 | } | |
628 | ||
4490c711 MT |
629 | static void ivshmem_write_config(PCIDevice *pci_dev, uint32_t address, |
630 | uint32_t val, int len) | |
631 | { | |
632 | pci_default_write_config(pci_dev, address, val, len); | |
633 | msix_write_config(pci_dev, address, val, len); | |
634 | } | |
635 | ||
6cbf4c8c CM |
636 | static int pci_ivshmem_init(PCIDevice *dev) |
637 | { | |
638 | IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); | |
639 | uint8_t *pci_conf; | |
640 | ||
641 | if (s->sizearg == NULL) | |
642 | s->ivshmem_size = 4 << 20; /* 4 MB default */ | |
643 | else { | |
644 | s->ivshmem_size = ivshmem_get_size(s); | |
645 | } | |
646 | ||
647 | register_savevm(&s->dev.qdev, "ivshmem", 0, 0, ivshmem_save, ivshmem_load, | |
648 | dev); | |
649 | ||
650 | /* IRQFD requires MSI */ | |
651 | if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD) && | |
652 | !ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
653 | fprintf(stderr, "ivshmem: ioeventfd/irqfd requires MSI\n"); | |
654 | exit(1); | |
655 | } | |
656 | ||
657 | /* check that role is reasonable */ | |
658 | if (s->role) { | |
659 | if (strncmp(s->role, "peer", 5) == 0) { | |
660 | s->role_val = IVSHMEM_PEER; | |
661 | } else if (strncmp(s->role, "master", 7) == 0) { | |
662 | s->role_val = IVSHMEM_MASTER; | |
663 | } else { | |
664 | fprintf(stderr, "ivshmem: 'role' must be 'peer' or 'master'\n"); | |
665 | exit(1); | |
666 | } | |
667 | } else { | |
668 | s->role_val = IVSHMEM_MASTER; /* default */ | |
669 | } | |
670 | ||
671 | if (s->role_val == IVSHMEM_PEER) { | |
c3594ed7 AG |
672 | error_set(&s->migration_blocker, QERR_DEVICE_FEATURE_BLOCKS_MIGRATION, |
673 | "peer mode", "ivshmem"); | |
38e0735e | 674 | migrate_add_blocker(s->migration_blocker); |
6cbf4c8c CM |
675 | } |
676 | ||
677 | pci_conf = s->dev.config; | |
6cbf4c8c | 678 | pci_conf[PCI_COMMAND] = PCI_COMMAND_IO | PCI_COMMAND_MEMORY; |
6cbf4c8c CM |
679 | |
680 | pci_config_set_interrupt_pin(pci_conf, 1); | |
681 | ||
6cbf4c8c CM |
682 | s->shm_fd = 0; |
683 | ||
cb06608e AK |
684 | memory_region_init_io(&s->ivshmem_mmio, &ivshmem_mmio_ops, s, |
685 | "ivshmem-mmio", IVSHMEM_REG_BAR_SIZE); | |
686 | ||
6cbf4c8c | 687 | /* region for registers*/ |
e824b2cc AK |
688 | pci_register_bar(&s->dev, 0, PCI_BASE_ADDRESS_SPACE_MEMORY, |
689 | &s->ivshmem_mmio); | |
cb06608e AK |
690 | |
691 | memory_region_init(&s->bar, "ivshmem-bar2-container", s->ivshmem_size); | |
c08ba66f GH |
692 | s->ivshmem_attr = PCI_BASE_ADDRESS_SPACE_MEMORY | |
693 | PCI_BASE_ADDRESS_MEM_PREFETCH; | |
694 | if (s->ivshmem_64bit) { | |
695 | s->ivshmem_attr |= PCI_BASE_ADDRESS_MEM_TYPE_64; | |
696 | } | |
6cbf4c8c CM |
697 | |
698 | if ((s->server_chr != NULL) && | |
699 | (strncmp(s->server_chr->filename, "unix:", 5) == 0)) { | |
700 | /* if we get a UNIX socket as the parameter we will talk | |
701 | * to the ivshmem server to receive the memory region */ | |
702 | ||
703 | if (s->shmobj != NULL) { | |
704 | fprintf(stderr, "WARNING: do not specify both 'chardev' " | |
705 | "and 'shm' with ivshmem\n"); | |
706 | } | |
707 | ||
708 | IVSHMEM_DPRINTF("using shared memory server (socket = %s)\n", | |
709 | s->server_chr->filename); | |
710 | ||
711 | if (ivshmem_has_feature(s, IVSHMEM_MSI)) { | |
712 | ivshmem_setup_msi(s); | |
713 | } | |
714 | ||
715 | /* we allocate enough space for 16 guests and grow as needed */ | |
716 | s->nb_peers = 16; | |
717 | s->vm_id = -1; | |
718 | ||
719 | /* allocate/initialize space for interrupt handling */ | |
7267c094 | 720 | s->peers = g_malloc0(s->nb_peers * sizeof(Peer)); |
6cbf4c8c | 721 | |
c08ba66f | 722 | pci_register_bar(&s->dev, 2, s->ivshmem_attr, &s->bar); |
6cbf4c8c | 723 | |
7267c094 | 724 | s->eventfd_chr = g_malloc0(s->vectors * sizeof(CharDriverState *)); |
6cbf4c8c CM |
725 | |
726 | qemu_chr_add_handlers(s->server_chr, ivshmem_can_receive, ivshmem_read, | |
727 | ivshmem_event, s); | |
728 | } else { | |
729 | /* just map the file immediately, we're not using a server */ | |
730 | int fd; | |
731 | ||
732 | if (s->shmobj == NULL) { | |
733 | fprintf(stderr, "Must specify 'chardev' or 'shm' to ivshmem\n"); | |
734 | } | |
735 | ||
736 | IVSHMEM_DPRINTF("using shm_open (shm object = %s)\n", s->shmobj); | |
737 | ||
738 | /* try opening with O_EXCL and if it succeeds zero the memory | |
739 | * by truncating to 0 */ | |
740 | if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR|O_EXCL, | |
741 | S_IRWXU|S_IRWXG|S_IRWXO)) > 0) { | |
742 | /* truncate file to length PCI device's memory */ | |
743 | if (ftruncate(fd, s->ivshmem_size) != 0) { | |
744 | fprintf(stderr, "ivshmem: could not truncate shared file\n"); | |
745 | } | |
746 | ||
747 | } else if ((fd = shm_open(s->shmobj, O_CREAT|O_RDWR, | |
748 | S_IRWXU|S_IRWXG|S_IRWXO)) < 0) { | |
749 | fprintf(stderr, "ivshmem: could not open shared file\n"); | |
750 | exit(-1); | |
751 | ||
752 | } | |
753 | ||
754 | if (check_shm_size(s, fd) == -1) { | |
755 | exit(-1); | |
756 | } | |
757 | ||
758 | create_shared_memory_BAR(s, fd); | |
759 | ||
760 | } | |
761 | ||
4490c711 MT |
762 | s->dev.config_write = ivshmem_write_config; |
763 | ||
6cbf4c8c CM |
764 | return 0; |
765 | } | |
766 | ||
f90c2bcd | 767 | static void pci_ivshmem_uninit(PCIDevice *dev) |
6cbf4c8c CM |
768 | { |
769 | IVShmemState *s = DO_UPCAST(IVShmemState, dev, dev); | |
770 | ||
38e0735e AL |
771 | if (s->migration_blocker) { |
772 | migrate_del_blocker(s->migration_blocker); | |
773 | error_free(s->migration_blocker); | |
774 | } | |
775 | ||
cb06608e AK |
776 | memory_region_destroy(&s->ivshmem_mmio); |
777 | memory_region_del_subregion(&s->bar, &s->ivshmem); | |
c5705a77 | 778 | vmstate_unregister_ram(&s->ivshmem, &s->dev.qdev); |
cb06608e AK |
779 | memory_region_destroy(&s->ivshmem); |
780 | memory_region_destroy(&s->bar); | |
6cbf4c8c | 781 | unregister_savevm(&dev->qdev, "ivshmem", s); |
6cbf4c8c CM |
782 | } |
783 | ||
40021f08 AL |
784 | static Property ivshmem_properties[] = { |
785 | DEFINE_PROP_CHR("chardev", IVShmemState, server_chr), | |
786 | DEFINE_PROP_STRING("size", IVShmemState, sizearg), | |
787 | DEFINE_PROP_UINT32("vectors", IVShmemState, vectors, 1), | |
788 | DEFINE_PROP_BIT("ioeventfd", IVShmemState, features, IVSHMEM_IOEVENTFD, false), | |
789 | DEFINE_PROP_BIT("msi", IVShmemState, features, IVSHMEM_MSI, true), | |
790 | DEFINE_PROP_STRING("shm", IVShmemState, shmobj), | |
791 | DEFINE_PROP_STRING("role", IVShmemState, role), | |
c08ba66f | 792 | DEFINE_PROP_UINT32("use64", IVShmemState, ivshmem_64bit, 1), |
40021f08 AL |
793 | DEFINE_PROP_END_OF_LIST(), |
794 | }; | |
795 | ||
796 | static void ivshmem_class_init(ObjectClass *klass, void *data) | |
797 | { | |
39bffca2 | 798 | DeviceClass *dc = DEVICE_CLASS(klass); |
40021f08 AL |
799 | PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
800 | ||
801 | k->init = pci_ivshmem_init; | |
802 | k->exit = pci_ivshmem_uninit; | |
803 | k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; | |
804 | k->device_id = 0x1110; | |
805 | k->class_id = PCI_CLASS_MEMORY_RAM; | |
39bffca2 AL |
806 | dc->reset = ivshmem_reset; |
807 | dc->props = ivshmem_properties; | |
40021f08 AL |
808 | } |
809 | ||
39bffca2 AL |
810 | static TypeInfo ivshmem_info = { |
811 | .name = "ivshmem", | |
812 | .parent = TYPE_PCI_DEVICE, | |
813 | .instance_size = sizeof(IVShmemState), | |
814 | .class_init = ivshmem_class_init, | |
6cbf4c8c CM |
815 | }; |
816 | ||
83f7d43a | 817 | static void ivshmem_register_types(void) |
6cbf4c8c | 818 | { |
39bffca2 | 819 | type_register_static(&ivshmem_info); |
6cbf4c8c CM |
820 | } |
821 | ||
83f7d43a | 822 | type_init(ivshmem_register_types) |