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fd66dbd4 SH |
1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
2 | /* | |
3 | * libblkio BlockDriver | |
4 | * | |
5 | * Copyright Red Hat, Inc. | |
6 | * | |
7 | * Author: | |
8 | * Stefan Hajnoczi <stefanha@redhat.com> | |
9 | */ | |
10 | ||
11 | #include "qemu/osdep.h" | |
12 | #include <blkio.h> | |
13 | #include "block/block_int.h" | |
c5640b3e SH |
14 | #include "exec/memory.h" |
15 | #include "exec/cpu-common.h" /* for qemu_ram_get_fd() */ | |
fd66dbd4 | 16 | #include "qapi/error.h" |
c5640b3e | 17 | #include "qemu/error-report.h" |
fd66dbd4 SH |
18 | #include "qapi/qmp/qdict.h" |
19 | #include "qemu/module.h" | |
28ff7b4d | 20 | #include "sysemu/block-backend.h" |
c5640b3e | 21 | #include "exec/memory.h" /* for ram_block_discard_disable() */ |
fd66dbd4 | 22 | |
4f01a9bb PK |
23 | #include "block/block-io.h" |
24 | ||
fd66dbd4 SH |
25 | /* |
26 | * Allocated bounce buffers are kept in a list sorted by buffer address. | |
27 | */ | |
28 | typedef struct BlkioBounceBuf { | |
29 | QLIST_ENTRY(BlkioBounceBuf) next; | |
30 | ||
31 | /* The bounce buffer */ | |
32 | struct iovec buf; | |
33 | } BlkioBounceBuf; | |
34 | ||
35 | typedef struct { | |
36 | /* | |
37 | * libblkio is not thread-safe so this lock protects ->blkio and | |
38 | * ->blkioq. | |
39 | */ | |
40 | QemuMutex blkio_lock; | |
41 | struct blkio *blkio; | |
42 | struct blkioq *blkioq; /* make this multi-queue in the future... */ | |
43 | int completion_fd; | |
44 | ||
45 | /* | |
46 | * Polling fetches the next completion into this field. | |
47 | * | |
48 | * No lock is necessary since only one thread calls aio_poll() and invokes | |
49 | * fd and poll handlers. | |
50 | */ | |
51 | struct blkio_completion poll_completion; | |
52 | ||
53 | /* | |
54 | * Protects ->bounce_pool, ->bounce_bufs, ->bounce_available. | |
55 | * | |
56 | * Lock ordering: ->bounce_lock before ->blkio_lock. | |
57 | */ | |
58 | CoMutex bounce_lock; | |
59 | ||
60 | /* Bounce buffer pool */ | |
61 | struct blkio_mem_region bounce_pool; | |
62 | ||
63 | /* Sorted list of allocated bounce buffers */ | |
64 | QLIST_HEAD(, BlkioBounceBuf) bounce_bufs; | |
65 | ||
66 | /* Queue for coroutines waiting for bounce buffer space */ | |
67 | CoQueue bounce_available; | |
68 | ||
69 | /* The value of the "mem-region-alignment" property */ | |
70 | size_t mem_region_alignment; | |
71 | ||
72 | /* Can we skip adding/deleting blkio_mem_regions? */ | |
73 | bool needs_mem_regions; | |
c5640b3e SH |
74 | |
75 | /* Are file descriptors necessary for blkio_mem_regions? */ | |
76 | bool needs_mem_region_fd; | |
77 | ||
78 | /* Are madvise(MADV_DONTNEED)-style operations unavailable? */ | |
79 | bool may_pin_mem_regions; | |
fd66dbd4 SH |
80 | } BDRVBlkioState; |
81 | ||
82 | /* Called with s->bounce_lock held */ | |
83 | static int blkio_resize_bounce_pool(BDRVBlkioState *s, int64_t bytes) | |
84 | { | |
85 | /* There can be no allocated bounce buffers during resize */ | |
86 | assert(QLIST_EMPTY(&s->bounce_bufs)); | |
87 | ||
88 | /* Pad size to reduce frequency of resize calls */ | |
89 | bytes += 128 * 1024; | |
90 | ||
91 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
92 | int ret; | |
93 | ||
94 | if (s->bounce_pool.addr) { | |
95 | blkio_unmap_mem_region(s->blkio, &s->bounce_pool); | |
96 | blkio_free_mem_region(s->blkio, &s->bounce_pool); | |
97 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); | |
98 | } | |
99 | ||
100 | /* Automatically freed when s->blkio is destroyed */ | |
101 | ret = blkio_alloc_mem_region(s->blkio, &s->bounce_pool, bytes); | |
102 | if (ret < 0) { | |
103 | return ret; | |
104 | } | |
105 | ||
106 | ret = blkio_map_mem_region(s->blkio, &s->bounce_pool); | |
107 | if (ret < 0) { | |
108 | blkio_free_mem_region(s->blkio, &s->bounce_pool); | |
109 | memset(&s->bounce_pool, 0, sizeof(s->bounce_pool)); | |
110 | return ret; | |
111 | } | |
112 | } | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | /* Called with s->bounce_lock held */ | |
118 | static bool | |
119 | blkio_do_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, | |
120 | int64_t bytes) | |
121 | { | |
122 | void *addr = s->bounce_pool.addr; | |
123 | BlkioBounceBuf *cur = NULL; | |
124 | BlkioBounceBuf *prev = NULL; | |
125 | ptrdiff_t space; | |
126 | ||
127 | /* | |
128 | * This is just a linear search over the holes between requests. An | |
129 | * efficient allocator would be nice. | |
130 | */ | |
131 | QLIST_FOREACH(cur, &s->bounce_bufs, next) { | |
132 | space = cur->buf.iov_base - addr; | |
133 | if (bytes <= space) { | |
134 | QLIST_INSERT_BEFORE(cur, bounce, next); | |
135 | bounce->buf.iov_base = addr; | |
136 | bounce->buf.iov_len = bytes; | |
137 | return true; | |
138 | } | |
139 | ||
140 | addr = cur->buf.iov_base + cur->buf.iov_len; | |
141 | prev = cur; | |
142 | } | |
143 | ||
144 | /* Is there space after the last request? */ | |
145 | space = s->bounce_pool.addr + s->bounce_pool.len - addr; | |
146 | if (bytes > space) { | |
147 | return false; | |
148 | } | |
149 | if (prev) { | |
150 | QLIST_INSERT_AFTER(prev, bounce, next); | |
151 | } else { | |
152 | QLIST_INSERT_HEAD(&s->bounce_bufs, bounce, next); | |
153 | } | |
154 | bounce->buf.iov_base = addr; | |
155 | bounce->buf.iov_len = bytes; | |
156 | return true; | |
157 | } | |
158 | ||
159 | static int coroutine_fn | |
160 | blkio_alloc_bounce_buffer(BDRVBlkioState *s, BlkioBounceBuf *bounce, | |
161 | int64_t bytes) | |
162 | { | |
163 | /* | |
164 | * Ensure fairness: first time around we join the back of the queue, | |
165 | * subsequently we join the front so we don't lose our place. | |
166 | */ | |
167 | CoQueueWaitFlags wait_flags = 0; | |
168 | ||
169 | QEMU_LOCK_GUARD(&s->bounce_lock); | |
170 | ||
171 | /* Ensure fairness: don't even try if other requests are already waiting */ | |
172 | if (!qemu_co_queue_empty(&s->bounce_available)) { | |
173 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, | |
174 | wait_flags); | |
175 | wait_flags = CO_QUEUE_WAIT_FRONT; | |
176 | } | |
177 | ||
178 | while (true) { | |
179 | if (blkio_do_alloc_bounce_buffer(s, bounce, bytes)) { | |
180 | /* Kick the next queued request since there may be space */ | |
181 | qemu_co_queue_next(&s->bounce_available); | |
182 | return 0; | |
183 | } | |
184 | ||
185 | /* | |
186 | * If there are no in-flight requests then the pool was simply too | |
187 | * small. | |
188 | */ | |
189 | if (QLIST_EMPTY(&s->bounce_bufs)) { | |
190 | bool ok; | |
191 | int ret; | |
192 | ||
193 | ret = blkio_resize_bounce_pool(s, bytes); | |
194 | if (ret < 0) { | |
195 | /* Kick the next queued request since that may fail too */ | |
196 | qemu_co_queue_next(&s->bounce_available); | |
197 | return ret; | |
198 | } | |
199 | ||
200 | ok = blkio_do_alloc_bounce_buffer(s, bounce, bytes); | |
201 | assert(ok); /* must have space this time */ | |
202 | return 0; | |
203 | } | |
204 | ||
205 | qemu_co_queue_wait_flags(&s->bounce_available, &s->bounce_lock, | |
206 | wait_flags); | |
207 | wait_flags = CO_QUEUE_WAIT_FRONT; | |
208 | } | |
209 | } | |
210 | ||
211 | static void coroutine_fn blkio_free_bounce_buffer(BDRVBlkioState *s, | |
212 | BlkioBounceBuf *bounce) | |
213 | { | |
214 | QEMU_LOCK_GUARD(&s->bounce_lock); | |
215 | ||
216 | QLIST_REMOVE(bounce, next); | |
217 | ||
218 | /* Wake up waiting coroutines since space may now be available */ | |
219 | qemu_co_queue_next(&s->bounce_available); | |
220 | } | |
221 | ||
222 | /* For async to .bdrv_co_*() conversion */ | |
223 | typedef struct { | |
224 | Coroutine *coroutine; | |
225 | int ret; | |
226 | } BlkioCoData; | |
227 | ||
228 | static void blkio_completion_fd_read(void *opaque) | |
229 | { | |
230 | BlockDriverState *bs = opaque; | |
231 | BDRVBlkioState *s = bs->opaque; | |
232 | uint64_t val; | |
233 | int ret; | |
234 | ||
235 | /* Polling may have already fetched a completion */ | |
236 | if (s->poll_completion.user_data != NULL) { | |
237 | BlkioCoData *cod = s->poll_completion.user_data; | |
238 | cod->ret = s->poll_completion.ret; | |
239 | ||
240 | /* Clear it in case aio_co_wake() enters a nested event loop */ | |
241 | s->poll_completion.user_data = NULL; | |
242 | ||
243 | aio_co_wake(cod->coroutine); | |
244 | } | |
245 | ||
246 | /* Reset completion fd status */ | |
247 | ret = read(s->completion_fd, &val, sizeof(val)); | |
248 | ||
249 | /* Ignore errors, there's nothing we can do */ | |
250 | (void)ret; | |
251 | ||
252 | /* | |
253 | * Reading one completion at a time makes nested event loop re-entrancy | |
254 | * simple. Change this loop to get multiple completions in one go if it | |
255 | * becomes a performance bottleneck. | |
256 | */ | |
257 | while (true) { | |
258 | struct blkio_completion completion; | |
259 | ||
260 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
261 | ret = blkioq_do_io(s->blkioq, &completion, 0, 1, NULL); | |
262 | } | |
263 | if (ret != 1) { | |
264 | break; | |
265 | } | |
266 | ||
267 | BlkioCoData *cod = completion.user_data; | |
268 | cod->ret = completion.ret; | |
269 | aio_co_wake(cod->coroutine); | |
270 | } | |
271 | } | |
272 | ||
273 | static bool blkio_completion_fd_poll(void *opaque) | |
274 | { | |
275 | BlockDriverState *bs = opaque; | |
276 | BDRVBlkioState *s = bs->opaque; | |
277 | int ret; | |
278 | ||
279 | /* Just in case we already fetched a completion */ | |
280 | if (s->poll_completion.user_data != NULL) { | |
281 | return true; | |
282 | } | |
283 | ||
284 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
285 | ret = blkioq_do_io(s->blkioq, &s->poll_completion, 0, 1, NULL); | |
286 | } | |
287 | return ret == 1; | |
288 | } | |
289 | ||
290 | static void blkio_completion_fd_poll_ready(void *opaque) | |
291 | { | |
292 | blkio_completion_fd_read(opaque); | |
293 | } | |
294 | ||
295 | static void blkio_attach_aio_context(BlockDriverState *bs, | |
296 | AioContext *new_context) | |
297 | { | |
298 | BDRVBlkioState *s = bs->opaque; | |
299 | ||
60f782b6 SH |
300 | aio_set_fd_handler(new_context, s->completion_fd, |
301 | blkio_completion_fd_read, NULL, | |
fd66dbd4 | 302 | blkio_completion_fd_poll, |
60f782b6 | 303 | blkio_completion_fd_poll_ready, bs); |
fd66dbd4 SH |
304 | } |
305 | ||
306 | static void blkio_detach_aio_context(BlockDriverState *bs) | |
307 | { | |
308 | BDRVBlkioState *s = bs->opaque; | |
309 | ||
60f782b6 SH |
310 | aio_set_fd_handler(bdrv_get_aio_context(bs), s->completion_fd, NULL, NULL, |
311 | NULL, NULL, NULL); | |
fd66dbd4 SH |
312 | } |
313 | ||
28ff7b4d SH |
314 | /* |
315 | * Called by blk_io_unplug() or immediately if not plugged. Called without | |
316 | * blkio_lock. | |
317 | */ | |
318 | static void blkio_unplug_fn(void *opaque) | |
fd66dbd4 | 319 | { |
28ff7b4d | 320 | BDRVBlkioState *s = opaque; |
fd66dbd4 | 321 | |
28ff7b4d | 322 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { |
fd66dbd4 SH |
323 | blkioq_do_io(s->blkioq, NULL, 0, 0, NULL); |
324 | } | |
325 | } | |
326 | ||
28ff7b4d SH |
327 | /* |
328 | * Schedule I/O submission after enqueuing a new request. Called without | |
329 | * blkio_lock. | |
330 | */ | |
331 | static void blkio_submit_io(BlockDriverState *bs) | |
332 | { | |
333 | BDRVBlkioState *s = bs->opaque; | |
334 | ||
335 | blk_io_plug_call(blkio_unplug_fn, s); | |
336 | } | |
337 | ||
fd66dbd4 SH |
338 | static int coroutine_fn |
339 | blkio_co_pdiscard(BlockDriverState *bs, int64_t offset, int64_t bytes) | |
340 | { | |
341 | BDRVBlkioState *s = bs->opaque; | |
342 | BlkioCoData cod = { | |
343 | .coroutine = qemu_coroutine_self(), | |
344 | }; | |
345 | ||
346 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
347 | blkioq_discard(s->blkioq, offset, bytes, &cod, 0); | |
fd66dbd4 SH |
348 | } |
349 | ||
28ff7b4d | 350 | blkio_submit_io(bs); |
fd66dbd4 SH |
351 | qemu_coroutine_yield(); |
352 | return cod.ret; | |
353 | } | |
354 | ||
355 | static int coroutine_fn | |
356 | blkio_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes, | |
357 | QEMUIOVector *qiov, BdrvRequestFlags flags) | |
358 | { | |
359 | BlkioCoData cod = { | |
360 | .coroutine = qemu_coroutine_self(), | |
361 | }; | |
362 | BDRVBlkioState *s = bs->opaque; | |
c5640b3e SH |
363 | bool use_bounce_buffer = |
364 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); | |
fd66dbd4 SH |
365 | BlkioBounceBuf bounce; |
366 | struct iovec *iov = qiov->iov; | |
367 | int iovcnt = qiov->niov; | |
368 | ||
369 | if (use_bounce_buffer) { | |
370 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); | |
371 | if (ret < 0) { | |
372 | return ret; | |
373 | } | |
374 | ||
375 | iov = &bounce.buf; | |
376 | iovcnt = 1; | |
377 | } | |
378 | ||
379 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
380 | blkioq_readv(s->blkioq, offset, iov, iovcnt, &cod, 0); | |
fd66dbd4 SH |
381 | } |
382 | ||
28ff7b4d | 383 | blkio_submit_io(bs); |
fd66dbd4 SH |
384 | qemu_coroutine_yield(); |
385 | ||
386 | if (use_bounce_buffer) { | |
387 | if (cod.ret == 0) { | |
388 | qemu_iovec_from_buf(qiov, 0, | |
389 | bounce.buf.iov_base, | |
390 | bounce.buf.iov_len); | |
391 | } | |
392 | ||
393 | blkio_free_bounce_buffer(s, &bounce); | |
394 | } | |
395 | ||
396 | return cod.ret; | |
397 | } | |
398 | ||
399 | static int coroutine_fn blkio_co_pwritev(BlockDriverState *bs, int64_t offset, | |
400 | int64_t bytes, QEMUIOVector *qiov, BdrvRequestFlags flags) | |
401 | { | |
402 | uint32_t blkio_flags = (flags & BDRV_REQ_FUA) ? BLKIO_REQ_FUA : 0; | |
403 | BlkioCoData cod = { | |
404 | .coroutine = qemu_coroutine_self(), | |
405 | }; | |
406 | BDRVBlkioState *s = bs->opaque; | |
c5640b3e SH |
407 | bool use_bounce_buffer = |
408 | s->needs_mem_regions && !(flags & BDRV_REQ_REGISTERED_BUF); | |
fd66dbd4 SH |
409 | BlkioBounceBuf bounce; |
410 | struct iovec *iov = qiov->iov; | |
411 | int iovcnt = qiov->niov; | |
412 | ||
413 | if (use_bounce_buffer) { | |
414 | int ret = blkio_alloc_bounce_buffer(s, &bounce, bytes); | |
415 | if (ret < 0) { | |
416 | return ret; | |
417 | } | |
418 | ||
419 | qemu_iovec_to_buf(qiov, 0, bounce.buf.iov_base, bytes); | |
420 | iov = &bounce.buf; | |
421 | iovcnt = 1; | |
422 | } | |
423 | ||
424 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
425 | blkioq_writev(s->blkioq, offset, iov, iovcnt, &cod, blkio_flags); | |
fd66dbd4 SH |
426 | } |
427 | ||
28ff7b4d | 428 | blkio_submit_io(bs); |
fd66dbd4 SH |
429 | qemu_coroutine_yield(); |
430 | ||
431 | if (use_bounce_buffer) { | |
432 | blkio_free_bounce_buffer(s, &bounce); | |
433 | } | |
434 | ||
435 | return cod.ret; | |
436 | } | |
437 | ||
438 | static int coroutine_fn blkio_co_flush(BlockDriverState *bs) | |
439 | { | |
440 | BDRVBlkioState *s = bs->opaque; | |
441 | BlkioCoData cod = { | |
442 | .coroutine = qemu_coroutine_self(), | |
443 | }; | |
444 | ||
445 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
446 | blkioq_flush(s->blkioq, &cod, 0); | |
fd66dbd4 SH |
447 | } |
448 | ||
28ff7b4d | 449 | blkio_submit_io(bs); |
fd66dbd4 SH |
450 | qemu_coroutine_yield(); |
451 | return cod.ret; | |
452 | } | |
453 | ||
454 | static int coroutine_fn blkio_co_pwrite_zeroes(BlockDriverState *bs, | |
455 | int64_t offset, int64_t bytes, BdrvRequestFlags flags) | |
456 | { | |
457 | BDRVBlkioState *s = bs->opaque; | |
458 | BlkioCoData cod = { | |
459 | .coroutine = qemu_coroutine_self(), | |
460 | }; | |
461 | uint32_t blkio_flags = 0; | |
462 | ||
463 | if (flags & BDRV_REQ_FUA) { | |
464 | blkio_flags |= BLKIO_REQ_FUA; | |
465 | } | |
466 | if (!(flags & BDRV_REQ_MAY_UNMAP)) { | |
467 | blkio_flags |= BLKIO_REQ_NO_UNMAP; | |
468 | } | |
469 | if (flags & BDRV_REQ_NO_FALLBACK) { | |
470 | blkio_flags |= BLKIO_REQ_NO_FALLBACK; | |
471 | } | |
472 | ||
473 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
474 | blkioq_write_zeroes(s->blkioq, offset, bytes, &cod, blkio_flags); | |
fd66dbd4 SH |
475 | } |
476 | ||
28ff7b4d | 477 | blkio_submit_io(bs); |
fd66dbd4 SH |
478 | qemu_coroutine_yield(); |
479 | return cod.ret; | |
480 | } | |
481 | ||
c5640b3e SH |
482 | typedef enum { |
483 | BMRR_OK, | |
484 | BMRR_SKIP, | |
485 | BMRR_FAIL, | |
486 | } BlkioMemRegionResult; | |
487 | ||
488 | /* | |
489 | * Produce a struct blkio_mem_region for a given address and size. | |
490 | * | |
491 | * This function produces identical results when called multiple times with the | |
492 | * same arguments. This property is necessary because blkio_unmap_mem_region() | |
493 | * must receive the same struct blkio_mem_region field values that were passed | |
494 | * to blkio_map_mem_region(). | |
495 | */ | |
496 | static BlkioMemRegionResult | |
497 | blkio_mem_region_from_host(BlockDriverState *bs, | |
498 | void *host, size_t size, | |
499 | struct blkio_mem_region *region, | |
500 | Error **errp) | |
501 | { | |
502 | BDRVBlkioState *s = bs->opaque; | |
503 | int fd = -1; | |
504 | ram_addr_t fd_offset = 0; | |
505 | ||
506 | if (((uintptr_t)host | size) % s->mem_region_alignment) { | |
507 | error_setg(errp, "unaligned buf %p with size %zu", host, size); | |
508 | return BMRR_FAIL; | |
509 | } | |
510 | ||
511 | /* Attempt to find the fd for the underlying memory */ | |
512 | if (s->needs_mem_region_fd) { | |
513 | RAMBlock *ram_block; | |
514 | RAMBlock *end_block; | |
515 | ram_addr_t offset; | |
516 | ||
517 | /* | |
518 | * bdrv_register_buf() is called with the BQL held so mr lives at least | |
519 | * until this function returns. | |
520 | */ | |
521 | ram_block = qemu_ram_block_from_host(host, false, &fd_offset); | |
522 | if (ram_block) { | |
523 | fd = qemu_ram_get_fd(ram_block); | |
524 | } | |
525 | if (fd == -1) { | |
526 | /* | |
527 | * Ideally every RAMBlock would have an fd. pc-bios and other | |
528 | * things don't. Luckily they are usually not I/O buffers and we | |
529 | * can just ignore them. | |
530 | */ | |
531 | return BMRR_SKIP; | |
532 | } | |
533 | ||
534 | /* Make sure the fd covers the entire range */ | |
535 | end_block = qemu_ram_block_from_host(host + size - 1, false, &offset); | |
536 | if (ram_block != end_block) { | |
537 | error_setg(errp, "registered buffer at %p with size %zu extends " | |
538 | "beyond RAMBlock", host, size); | |
539 | return BMRR_FAIL; | |
540 | } | |
541 | } | |
542 | ||
543 | *region = (struct blkio_mem_region){ | |
544 | .addr = host, | |
545 | .len = size, | |
546 | .fd = fd, | |
547 | .fd_offset = fd_offset, | |
548 | }; | |
549 | return BMRR_OK; | |
550 | } | |
551 | ||
552 | static bool blkio_register_buf(BlockDriverState *bs, void *host, size_t size, | |
553 | Error **errp) | |
554 | { | |
555 | BDRVBlkioState *s = bs->opaque; | |
556 | struct blkio_mem_region region; | |
557 | BlkioMemRegionResult region_result; | |
558 | int ret; | |
559 | ||
560 | /* | |
561 | * Mapping memory regions conflicts with RAM discard (virtio-mem) when | |
562 | * there is pinning, so only do it when necessary. | |
563 | */ | |
564 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { | |
565 | return true; | |
566 | } | |
567 | ||
568 | region_result = blkio_mem_region_from_host(bs, host, size, ®ion, errp); | |
569 | if (region_result == BMRR_SKIP) { | |
570 | return true; | |
571 | } else if (region_result != BMRR_OK) { | |
572 | return false; | |
573 | } | |
574 | ||
575 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
576 | ret = blkio_map_mem_region(s->blkio, ®ion); | |
577 | } | |
578 | ||
579 | if (ret < 0) { | |
580 | error_setg(errp, "Failed to add blkio mem region %p with size %zu: %s", | |
581 | host, size, blkio_get_error_msg()); | |
582 | return false; | |
583 | } | |
584 | return true; | |
585 | } | |
586 | ||
587 | static void blkio_unregister_buf(BlockDriverState *bs, void *host, size_t size) | |
588 | { | |
589 | BDRVBlkioState *s = bs->opaque; | |
590 | struct blkio_mem_region region; | |
591 | ||
592 | /* See blkio_register_buf() */ | |
593 | if (!s->needs_mem_regions && s->may_pin_mem_regions) { | |
594 | return; | |
595 | } | |
596 | ||
597 | if (blkio_mem_region_from_host(bs, host, size, ®ion, NULL) != BMRR_OK) { | |
598 | return; | |
599 | } | |
600 | ||
601 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
602 | blkio_unmap_mem_region(s->blkio, ®ion); | |
603 | } | |
604 | } | |
605 | ||
69785d66 SG |
606 | static int blkio_io_uring_connect(BlockDriverState *bs, QDict *options, |
607 | int flags, Error **errp) | |
fd66dbd4 SH |
608 | { |
609 | const char *filename = qdict_get_str(options, "filename"); | |
610 | BDRVBlkioState *s = bs->opaque; | |
611 | int ret; | |
612 | ||
613 | ret = blkio_set_str(s->blkio, "path", filename); | |
614 | qdict_del(options, "filename"); | |
615 | if (ret < 0) { | |
616 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
617 | blkio_get_error_msg()); | |
618 | return ret; | |
619 | } | |
620 | ||
621 | if (flags & BDRV_O_NOCACHE) { | |
622 | ret = blkio_set_bool(s->blkio, "direct", true); | |
623 | if (ret < 0) { | |
624 | error_setg_errno(errp, -ret, "failed to set direct: %s", | |
625 | blkio_get_error_msg()); | |
626 | return ret; | |
627 | } | |
628 | } | |
629 | ||
69785d66 SG |
630 | ret = blkio_connect(s->blkio); |
631 | if (ret < 0) { | |
632 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
633 | blkio_get_error_msg()); | |
634 | return ret; | |
635 | } | |
636 | ||
fd66dbd4 SH |
637 | return 0; |
638 | } | |
639 | ||
69785d66 SG |
640 | static int blkio_nvme_io_uring_connect(BlockDriverState *bs, QDict *options, |
641 | int flags, Error **errp) | |
fd66dbd4 | 642 | { |
6c32fc0d | 643 | const char *path = qdict_get_try_str(options, "path"); |
fd66dbd4 SH |
644 | BDRVBlkioState *s = bs->opaque; |
645 | int ret; | |
646 | ||
6c32fc0d AF |
647 | if (!path) { |
648 | error_setg(errp, "missing 'path' option"); | |
649 | return -EINVAL; | |
650 | } | |
651 | ||
652 | ret = blkio_set_str(s->blkio, "path", path); | |
653 | qdict_del(options, "path"); | |
fd66dbd4 SH |
654 | if (ret < 0) { |
655 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
656 | blkio_get_error_msg()); | |
657 | return ret; | |
658 | } | |
659 | ||
660 | if (!(flags & BDRV_O_NOCACHE)) { | |
661 | error_setg(errp, "cache.direct=off is not supported"); | |
662 | return -EINVAL; | |
663 | } | |
664 | ||
69785d66 SG |
665 | ret = blkio_connect(s->blkio); |
666 | if (ret < 0) { | |
667 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
668 | blkio_get_error_msg()); | |
669 | return ret; | |
670 | } | |
671 | ||
fd66dbd4 SH |
672 | return 0; |
673 | } | |
674 | ||
69785d66 SG |
675 | static int blkio_virtio_blk_connect(BlockDriverState *bs, QDict *options, |
676 | int flags, Error **errp) | |
fd66dbd4 SH |
677 | { |
678 | const char *path = qdict_get_try_str(options, "path"); | |
679 | BDRVBlkioState *s = bs->opaque; | |
cad2ccc3 | 680 | bool fd_supported = false; |
0b054b4c | 681 | int fd = -1, ret; |
fd66dbd4 SH |
682 | |
683 | if (!path) { | |
684 | error_setg(errp, "missing 'path' option"); | |
685 | return -EINVAL; | |
686 | } | |
687 | ||
fd66dbd4 SH |
688 | if (!(flags & BDRV_O_NOCACHE)) { |
689 | error_setg(errp, "cache.direct=off is not supported"); | |
690 | return -EINVAL; | |
691 | } | |
cad2ccc3 | 692 | |
1c38fe69 | 693 | if (blkio_set_int(s->blkio, "fd", -1) == 0) { |
cad2ccc3 SG |
694 | fd_supported = true; |
695 | } | |
696 | ||
697 | /* | |
698 | * If the libblkio driver supports fd passing, let's always use qemu_open() | |
699 | * to open the `path`, so we can handle fd passing from the management | |
700 | * layer through the "/dev/fdset/N" special path. | |
701 | */ | |
702 | if (fd_supported) { | |
a5942c17 SG |
703 | /* |
704 | * `path` can contain the path of a character device | |
705 | * (e.g. /dev/vhost-vdpa-0 or /dev/vfio/vfio) or a unix socket. | |
706 | * | |
707 | * So, we should always open it with O_RDWR flag, also if BDRV_O_RDWR | |
708 | * is not set in the open flags, because the exchange of IOCTL commands | |
709 | * for example will fail. | |
710 | * | |
711 | * In order to open the device read-only, we are using the `read-only` | |
712 | * property of the libblkio driver in blkio_file_open(). | |
713 | */ | |
723bea27 | 714 | fd = qemu_open(path, O_RDWR, NULL); |
cad2ccc3 | 715 | if (fd < 0) { |
9b06d0d0 SG |
716 | /* |
717 | * qemu_open() can fail if the user specifies a path that is not | |
718 | * a file or device, for example in the case of Unix Domain Socket | |
719 | * for the virtio-blk-vhost-user driver. In such cases let's have | |
720 | * libblkio open the path directly. | |
721 | */ | |
723bea27 SG |
722 | fd_supported = false; |
723 | } else { | |
724 | ret = blkio_set_int(s->blkio, "fd", fd); | |
725 | if (ret < 0) { | |
726 | fd_supported = false; | |
727 | qemu_close(fd); | |
0b054b4c | 728 | fd = -1; |
723bea27 | 729 | } |
cad2ccc3 | 730 | } |
723bea27 | 731 | } |
cad2ccc3 | 732 | |
723bea27 | 733 | if (!fd_supported) { |
cad2ccc3 SG |
734 | ret = blkio_set_str(s->blkio, "path", path); |
735 | if (ret < 0) { | |
736 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
737 | blkio_get_error_msg()); | |
738 | return ret; | |
739 | } | |
740 | } | |
741 | ||
69785d66 | 742 | ret = blkio_connect(s->blkio); |
0b054b4c SG |
743 | if (ret < 0 && fd >= 0) { |
744 | /* Failed to give the FD to libblkio, close it */ | |
745 | qemu_close(fd); | |
746 | fd = -1; | |
747 | } | |
748 | ||
809c319f | 749 | /* |
9b06d0d0 SG |
750 | * Before https://gitlab.com/libblkio/libblkio/-/merge_requests/208 |
751 | * (libblkio <= v1.3.0), setting the `fd` property is not enough to check | |
752 | * whether the driver supports the `fd` property or not. In that case, | |
753 | * blkio_connect() will fail with -EINVAL. | |
754 | * So let's try calling blkio_connect() again by directly setting `path` | |
755 | * to cover this scenario. | |
809c319f SG |
756 | */ |
757 | if (fd_supported && ret == -EINVAL) { | |
809c319f SG |
758 | /* |
759 | * We need to clear the `fd` property we set previously by setting | |
760 | * it to -1. | |
761 | */ | |
762 | ret = blkio_set_int(s->blkio, "fd", -1); | |
763 | if (ret < 0) { | |
764 | error_setg_errno(errp, -ret, "failed to set fd: %s", | |
765 | blkio_get_error_msg()); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | ret = blkio_set_str(s->blkio, "path", path); | |
770 | if (ret < 0) { | |
771 | error_setg_errno(errp, -ret, "failed to set path: %s", | |
772 | blkio_get_error_msg()); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | ret = blkio_connect(s->blkio); | |
777 | } | |
778 | ||
69785d66 SG |
779 | if (ret < 0) { |
780 | error_setg_errno(errp, -ret, "blkio_connect failed: %s", | |
781 | blkio_get_error_msg()); | |
782 | return ret; | |
783 | } | |
784 | ||
cad2ccc3 SG |
785 | qdict_del(options, "path"); |
786 | ||
fd66dbd4 SH |
787 | return 0; |
788 | } | |
789 | ||
790 | static int blkio_file_open(BlockDriverState *bs, QDict *options, int flags, | |
791 | Error **errp) | |
792 | { | |
793 | const char *blkio_driver = bs->drv->protocol_name; | |
794 | BDRVBlkioState *s = bs->opaque; | |
795 | int ret; | |
796 | ||
797 | ret = blkio_create(blkio_driver, &s->blkio); | |
798 | if (ret < 0) { | |
799 | error_setg_errno(errp, -ret, "blkio_create failed: %s", | |
800 | blkio_get_error_msg()); | |
801 | return ret; | |
802 | } | |
803 | ||
fd66dbd4 SH |
804 | if (!(flags & BDRV_O_RDWR)) { |
805 | ret = blkio_set_bool(s->blkio, "read-only", true); | |
806 | if (ret < 0) { | |
807 | error_setg_errno(errp, -ret, "failed to set read-only: %s", | |
808 | blkio_get_error_msg()); | |
809 | blkio_destroy(&s->blkio); | |
810 | return ret; | |
811 | } | |
812 | } | |
813 | ||
69785d66 SG |
814 | if (strcmp(blkio_driver, "io_uring") == 0) { |
815 | ret = blkio_io_uring_connect(bs, options, flags, errp); | |
816 | } else if (strcmp(blkio_driver, "nvme-io_uring") == 0) { | |
817 | ret = blkio_nvme_io_uring_connect(bs, options, flags, errp); | |
818 | } else if (strcmp(blkio_driver, "virtio-blk-vfio-pci") == 0) { | |
819 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
820 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-user") == 0) { | |
821 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
822 | } else if (strcmp(blkio_driver, "virtio-blk-vhost-vdpa") == 0) { | |
823 | ret = blkio_virtio_blk_connect(bs, options, flags, errp); | |
824 | } else { | |
825 | g_assert_not_reached(); | |
826 | } | |
fd66dbd4 | 827 | if (ret < 0) { |
fd66dbd4 SH |
828 | blkio_destroy(&s->blkio); |
829 | return ret; | |
830 | } | |
831 | ||
832 | ret = blkio_get_bool(s->blkio, | |
833 | "needs-mem-regions", | |
834 | &s->needs_mem_regions); | |
835 | if (ret < 0) { | |
836 | error_setg_errno(errp, -ret, | |
837 | "failed to get needs-mem-regions: %s", | |
838 | blkio_get_error_msg()); | |
839 | blkio_destroy(&s->blkio); | |
840 | return ret; | |
841 | } | |
842 | ||
c5640b3e SH |
843 | ret = blkio_get_bool(s->blkio, |
844 | "needs-mem-region-fd", | |
845 | &s->needs_mem_region_fd); | |
846 | if (ret < 0) { | |
847 | error_setg_errno(errp, -ret, | |
848 | "failed to get needs-mem-region-fd: %s", | |
849 | blkio_get_error_msg()); | |
850 | blkio_destroy(&s->blkio); | |
851 | return ret; | |
852 | } | |
853 | ||
fd66dbd4 SH |
854 | ret = blkio_get_uint64(s->blkio, |
855 | "mem-region-alignment", | |
856 | &s->mem_region_alignment); | |
857 | if (ret < 0) { | |
858 | error_setg_errno(errp, -ret, | |
859 | "failed to get mem-region-alignment: %s", | |
860 | blkio_get_error_msg()); | |
861 | blkio_destroy(&s->blkio); | |
862 | return ret; | |
863 | } | |
864 | ||
c5640b3e SH |
865 | ret = blkio_get_bool(s->blkio, |
866 | "may-pin-mem-regions", | |
867 | &s->may_pin_mem_regions); | |
868 | if (ret < 0) { | |
869 | /* Be conservative (assume pinning) if the property is not supported */ | |
870 | s->may_pin_mem_regions = s->needs_mem_regions; | |
871 | } | |
872 | ||
873 | /* | |
874 | * Notify if libblkio drivers pin memory and prevent features like | |
875 | * virtio-mem from working. | |
876 | */ | |
877 | if (s->may_pin_mem_regions) { | |
878 | ret = ram_block_discard_disable(true); | |
879 | if (ret < 0) { | |
880 | error_setg_errno(errp, -ret, "ram_block_discard_disable() failed"); | |
881 | blkio_destroy(&s->blkio); | |
882 | return ret; | |
883 | } | |
884 | } | |
885 | ||
fd66dbd4 SH |
886 | ret = blkio_start(s->blkio); |
887 | if (ret < 0) { | |
888 | error_setg_errno(errp, -ret, "blkio_start failed: %s", | |
889 | blkio_get_error_msg()); | |
890 | blkio_destroy(&s->blkio); | |
c5640b3e SH |
891 | if (s->may_pin_mem_regions) { |
892 | ram_block_discard_disable(false); | |
893 | } | |
fd66dbd4 SH |
894 | return ret; |
895 | } | |
896 | ||
c5640b3e | 897 | bs->supported_write_flags = BDRV_REQ_FUA | BDRV_REQ_REGISTERED_BUF; |
fd66dbd4 SH |
898 | bs->supported_zero_flags = BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | |
899 | BDRV_REQ_NO_FALLBACK; | |
900 | ||
901 | qemu_mutex_init(&s->blkio_lock); | |
902 | qemu_co_mutex_init(&s->bounce_lock); | |
903 | qemu_co_queue_init(&s->bounce_available); | |
904 | QLIST_INIT(&s->bounce_bufs); | |
905 | s->blkioq = blkio_get_queue(s->blkio, 0); | |
906 | s->completion_fd = blkioq_get_completion_fd(s->blkioq); | |
9359c459 | 907 | blkioq_set_completion_fd_enabled(s->blkioq, true); |
fd66dbd4 SH |
908 | |
909 | blkio_attach_aio_context(bs, bdrv_get_aio_context(bs)); | |
910 | return 0; | |
911 | } | |
912 | ||
913 | static void blkio_close(BlockDriverState *bs) | |
914 | { | |
915 | BDRVBlkioState *s = bs->opaque; | |
916 | ||
917 | /* There is no destroy() API for s->bounce_lock */ | |
918 | ||
919 | qemu_mutex_destroy(&s->blkio_lock); | |
920 | blkio_detach_aio_context(bs); | |
921 | blkio_destroy(&s->blkio); | |
c5640b3e SH |
922 | |
923 | if (s->may_pin_mem_regions) { | |
924 | ram_block_discard_disable(false); | |
925 | } | |
fd66dbd4 SH |
926 | } |
927 | ||
c86422c5 | 928 | static int64_t coroutine_fn blkio_co_getlength(BlockDriverState *bs) |
fd66dbd4 SH |
929 | { |
930 | BDRVBlkioState *s = bs->opaque; | |
931 | uint64_t capacity; | |
932 | int ret; | |
933 | ||
934 | WITH_QEMU_LOCK_GUARD(&s->blkio_lock) { | |
935 | ret = blkio_get_uint64(s->blkio, "capacity", &capacity); | |
936 | } | |
937 | if (ret < 0) { | |
938 | return -ret; | |
939 | } | |
940 | ||
941 | return capacity; | |
942 | } | |
943 | ||
4c8f4fda AF |
944 | static int coroutine_fn blkio_truncate(BlockDriverState *bs, int64_t offset, |
945 | bool exact, PreallocMode prealloc, | |
946 | BdrvRequestFlags flags, Error **errp) | |
947 | { | |
948 | int64_t current_length; | |
949 | ||
950 | if (prealloc != PREALLOC_MODE_OFF) { | |
951 | error_setg(errp, "Unsupported preallocation mode '%s'", | |
952 | PreallocMode_str(prealloc)); | |
953 | return -ENOTSUP; | |
954 | } | |
955 | ||
c86422c5 | 956 | current_length = blkio_co_getlength(bs); |
4c8f4fda AF |
957 | |
958 | if (offset > current_length) { | |
959 | error_setg(errp, "Cannot grow device"); | |
960 | return -EINVAL; | |
961 | } else if (exact && offset != current_length) { | |
962 | error_setg(errp, "Cannot resize device"); | |
963 | return -ENOTSUP; | |
964 | } | |
965 | ||
966 | return 0; | |
967 | } | |
968 | ||
3d47eb0a EGE |
969 | static int coroutine_fn |
970 | blkio_co_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) | |
fd66dbd4 SH |
971 | { |
972 | return 0; | |
973 | } | |
974 | ||
975 | static void blkio_refresh_limits(BlockDriverState *bs, Error **errp) | |
976 | { | |
977 | BDRVBlkioState *s = bs->opaque; | |
978 | QEMU_LOCK_GUARD(&s->blkio_lock); | |
979 | int value; | |
980 | int ret; | |
981 | ||
982 | ret = blkio_get_int(s->blkio, "request-alignment", &value); | |
983 | if (ret < 0) { | |
984 | error_setg_errno(errp, -ret, "failed to get \"request-alignment\": %s", | |
985 | blkio_get_error_msg()); | |
986 | return; | |
987 | } | |
988 | bs->bl.request_alignment = value; | |
989 | if (bs->bl.request_alignment < 1 || | |
990 | bs->bl.request_alignment >= INT_MAX || | |
991 | !is_power_of_2(bs->bl.request_alignment)) { | |
992 | error_setg(errp, "invalid \"request-alignment\" value %" PRIu32 ", " | |
993 | "must be a power of 2 less than INT_MAX", | |
994 | bs->bl.request_alignment); | |
995 | return; | |
996 | } | |
997 | ||
998 | ret = blkio_get_int(s->blkio, "optimal-io-size", &value); | |
999 | if (ret < 0) { | |
1000 | error_setg_errno(errp, -ret, "failed to get \"optimal-io-size\": %s", | |
1001 | blkio_get_error_msg()); | |
1002 | return; | |
1003 | } | |
1004 | bs->bl.opt_transfer = value; | |
1005 | if (bs->bl.opt_transfer > INT_MAX || | |
1006 | (bs->bl.opt_transfer % bs->bl.request_alignment)) { | |
1007 | error_setg(errp, "invalid \"optimal-io-size\" value %" PRIu32 ", must " | |
1008 | "be a multiple of %" PRIu32, bs->bl.opt_transfer, | |
1009 | bs->bl.request_alignment); | |
1010 | return; | |
1011 | } | |
1012 | ||
1013 | ret = blkio_get_int(s->blkio, "max-transfer", &value); | |
1014 | if (ret < 0) { | |
1015 | error_setg_errno(errp, -ret, "failed to get \"max-transfer\": %s", | |
1016 | blkio_get_error_msg()); | |
1017 | return; | |
1018 | } | |
1019 | bs->bl.max_transfer = value; | |
1020 | if ((bs->bl.max_transfer % bs->bl.request_alignment) || | |
1021 | (bs->bl.opt_transfer && (bs->bl.max_transfer % bs->bl.opt_transfer))) { | |
1022 | error_setg(errp, "invalid \"max-transfer\" value %" PRIu32 ", must be " | |
1023 | "a multiple of %" PRIu32 " and %" PRIu32 " (if non-zero)", | |
1024 | bs->bl.max_transfer, bs->bl.request_alignment, | |
1025 | bs->bl.opt_transfer); | |
1026 | return; | |
1027 | } | |
1028 | ||
1029 | ret = blkio_get_int(s->blkio, "buf-alignment", &value); | |
1030 | if (ret < 0) { | |
1031 | error_setg_errno(errp, -ret, "failed to get \"buf-alignment\": %s", | |
1032 | blkio_get_error_msg()); | |
1033 | return; | |
1034 | } | |
1035 | if (value < 1) { | |
1036 | error_setg(errp, "invalid \"buf-alignment\" value %d, must be " | |
1037 | "positive", value); | |
1038 | return; | |
1039 | } | |
1040 | bs->bl.min_mem_alignment = value; | |
1041 | ||
1042 | ret = blkio_get_int(s->blkio, "optimal-buf-alignment", &value); | |
1043 | if (ret < 0) { | |
1044 | error_setg_errno(errp, -ret, | |
1045 | "failed to get \"optimal-buf-alignment\": %s", | |
1046 | blkio_get_error_msg()); | |
1047 | return; | |
1048 | } | |
1049 | if (value < 1) { | |
1050 | error_setg(errp, "invalid \"optimal-buf-alignment\" value %d, " | |
1051 | "must be positive", value); | |
1052 | return; | |
1053 | } | |
1054 | bs->bl.opt_mem_alignment = value; | |
1055 | ||
1056 | ret = blkio_get_int(s->blkio, "max-segments", &value); | |
1057 | if (ret < 0) { | |
1058 | error_setg_errno(errp, -ret, "failed to get \"max-segments\": %s", | |
1059 | blkio_get_error_msg()); | |
1060 | return; | |
1061 | } | |
1062 | if (value < 1) { | |
1063 | error_setg(errp, "invalid \"max-segments\" value %d, must be positive", | |
1064 | value); | |
1065 | return; | |
1066 | } | |
1067 | bs->bl.max_iov = value; | |
1068 | } | |
1069 | ||
1070 | /* | |
1071 | * TODO | |
1072 | * Missing libblkio APIs: | |
1073 | * - block_status | |
1074 | * - co_invalidate_cache | |
1075 | * | |
1076 | * Out of scope? | |
1077 | * - create | |
1078 | * - truncate | |
1079 | */ | |
1080 | ||
c21eae1c SH |
1081 | /* |
1082 | * Do not include .format_name and .protocol_name because module_block.py | |
1083 | * does not parse macros in the source code. | |
1084 | */ | |
1085 | #define BLKIO_DRIVER_COMMON \ | |
1086 | .instance_size = sizeof(BDRVBlkioState), \ | |
1087 | .bdrv_file_open = blkio_file_open, \ | |
1088 | .bdrv_close = blkio_close, \ | |
1089 | .bdrv_co_getlength = blkio_co_getlength, \ | |
1090 | .bdrv_co_truncate = blkio_truncate, \ | |
1091 | .bdrv_co_get_info = blkio_co_get_info, \ | |
1092 | .bdrv_attach_aio_context = blkio_attach_aio_context, \ | |
1093 | .bdrv_detach_aio_context = blkio_detach_aio_context, \ | |
1094 | .bdrv_co_pdiscard = blkio_co_pdiscard, \ | |
1095 | .bdrv_co_preadv = blkio_co_preadv, \ | |
1096 | .bdrv_co_pwritev = blkio_co_pwritev, \ | |
1097 | .bdrv_co_flush_to_disk = blkio_co_flush, \ | |
1098 | .bdrv_co_pwrite_zeroes = blkio_co_pwrite_zeroes, \ | |
1099 | .bdrv_refresh_limits = blkio_refresh_limits, \ | |
1100 | .bdrv_register_buf = blkio_register_buf, \ | |
1101 | .bdrv_unregister_buf = blkio_unregister_buf, | |
03d9e4c0 | 1102 | |
c21eae1c SH |
1103 | /* |
1104 | * Use the same .format_name and .protocol_name as the libblkio driver name for | |
1105 | * consistency. | |
1106 | */ | |
fd66dbd4 | 1107 | |
c21eae1c SH |
1108 | static BlockDriver bdrv_io_uring = { |
1109 | .format_name = "io_uring", | |
1110 | .protocol_name = "io_uring", | |
1111 | .bdrv_needs_filename = true, | |
1112 | BLKIO_DRIVER_COMMON | |
1113 | }; | |
1114 | ||
1115 | static BlockDriver bdrv_nvme_io_uring = { | |
1116 | .format_name = "nvme-io_uring", | |
1117 | .protocol_name = "nvme-io_uring", | |
1118 | BLKIO_DRIVER_COMMON | |
1119 | }; | |
1120 | ||
1121 | static BlockDriver bdrv_virtio_blk_vfio_pci = { | |
1122 | .format_name = "virtio-blk-vfio-pci", | |
1123 | .protocol_name = "virtio-blk-vfio-pci", | |
1124 | BLKIO_DRIVER_COMMON | |
1125 | }; | |
1126 | ||
1127 | static BlockDriver bdrv_virtio_blk_vhost_user = { | |
1128 | .format_name = "virtio-blk-vhost-user", | |
1129 | .protocol_name = "virtio-blk-vhost-user", | |
1130 | BLKIO_DRIVER_COMMON | |
1131 | }; | |
1132 | ||
1133 | static BlockDriver bdrv_virtio_blk_vhost_vdpa = { | |
1134 | .format_name = "virtio-blk-vhost-vdpa", | |
1135 | .protocol_name = "virtio-blk-vhost-vdpa", | |
1136 | BLKIO_DRIVER_COMMON | |
1137 | }; | |
fd66dbd4 SH |
1138 | |
1139 | static void bdrv_blkio_init(void) | |
1140 | { | |
1141 | bdrv_register(&bdrv_io_uring); | |
1142 | bdrv_register(&bdrv_nvme_io_uring); | |
03d9e4c0 | 1143 | bdrv_register(&bdrv_virtio_blk_vfio_pci); |
fd66dbd4 SH |
1144 | bdrv_register(&bdrv_virtio_blk_vhost_user); |
1145 | bdrv_register(&bdrv_virtio_blk_vhost_vdpa); | |
1146 | } | |
1147 | ||
1148 | block_init(bdrv_blkio_init); |