Commit | Line | Data |
---|---|---|
2866c82d JA |
1 | /* |
2 | * scsi generic sg v3 io engine | |
3 | * | |
4 | */ | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
9 | #include <assert.h> | |
10 | #include <sys/poll.h> | |
5f350952 JA |
11 | |
12 | #include "../fio.h" | |
13 | #include "../os.h" | |
2866c82d | 14 | |
34cfcdaf JA |
15 | #ifdef FIO_HAVE_SGIO |
16 | ||
2866c82d JA |
17 | struct sgio_cmd { |
18 | unsigned char cdb[10]; | |
19 | int nr; | |
20 | }; | |
21 | ||
22 | struct sgio_data { | |
23 | struct sgio_cmd *cmds; | |
24 | struct io_u **events; | |
dc0deca2 JA |
25 | struct pollfd *pfds; |
26 | int *fd_flags; | |
27 | void *sgbuf; | |
2866c82d JA |
28 | unsigned int bs; |
29 | }; | |
30 | ||
31 | static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr, | |
32 | struct io_u *io_u, int fs) | |
33 | { | |
34 | struct sgio_cmd *sc = &sd->cmds[io_u->index]; | |
35 | ||
36 | memset(hdr, 0, sizeof(*hdr)); | |
37 | memset(sc->cdb, 0, sizeof(sc->cdb)); | |
38 | ||
39 | hdr->interface_id = 'S'; | |
40 | hdr->cmdp = sc->cdb; | |
41 | hdr->cmd_len = sizeof(sc->cdb); | |
42 | hdr->pack_id = io_u->index; | |
43 | hdr->usr_ptr = io_u; | |
44 | ||
45 | if (fs) { | |
cec6b55d JA |
46 | hdr->dxferp = io_u->xfer_buf; |
47 | hdr->dxfer_len = io_u->xfer_buflen; | |
2866c82d JA |
48 | } |
49 | } | |
50 | ||
51 | static int fio_sgio_ioctl_getevents(struct thread_data *td, int fio_unused min, | |
52 | int max, struct timespec fio_unused *t) | |
53 | { | |
54 | assert(max <= 1); | |
55 | ||
56 | /* | |
57 | * we can only have one finished io_u for sync io, since the depth | |
58 | * is always 1 | |
59 | */ | |
60 | if (list_empty(&td->io_u_busylist)) | |
61 | return 0; | |
62 | ||
63 | return 1; | |
64 | } | |
65 | ||
adee86c5 JA |
66 | static int pollin_events(struct pollfd *pfds, int fds) |
67 | { | |
68 | int i; | |
69 | ||
70 | for (i = 0; i < fds; i++) | |
71 | if (pfds[i].revents & POLLIN) | |
72 | return 1; | |
73 | ||
74 | return 0; | |
75 | } | |
2866c82d JA |
76 | |
77 | static int fio_sgio_getevents(struct thread_data *td, int min, int max, | |
78 | struct timespec fio_unused *t) | |
79 | { | |
adee86c5 JA |
80 | /* |
81 | * normally hard coding &td->files[0] is a bug that needs to be fixed, | |
82 | * but it's ok here as all files should point to the same device. | |
83 | */ | |
53cdc686 | 84 | struct fio_file *f = &td->files[0]; |
2866c82d | 85 | struct sgio_data *sd = td->io_ops->data; |
dc0deca2 JA |
86 | int left = max, ret, events, i, r = 0; |
87 | void *buf = sd->sgbuf; | |
2866c82d JA |
88 | |
89 | /* | |
adee86c5 | 90 | * Fill in the file descriptors |
2866c82d | 91 | */ |
adee86c5 JA |
92 | for_each_file(td, f, i) { |
93 | /* | |
94 | * don't block for min events == 0 | |
95 | */ | |
96 | if (!min) { | |
dc0deca2 JA |
97 | sd->fd_flags[i] = fcntl(f->fd, F_GETFL); |
98 | fcntl(f->fd, F_SETFL, sd->fd_flags[i] | O_NONBLOCK); | |
adee86c5 | 99 | } |
dc0deca2 JA |
100 | sd->pfds[i].fd = f->fd; |
101 | sd->pfds[i].events = POLLIN; | |
2866c82d JA |
102 | } |
103 | ||
104 | while (left) { | |
adee86c5 JA |
105 | void *p; |
106 | ||
2866c82d JA |
107 | do { |
108 | if (!min) | |
109 | break; | |
adee86c5 | 110 | |
dc0deca2 | 111 | ret = poll(sd->pfds, td->nr_files, -1); |
adee86c5 JA |
112 | if (ret < 0) { |
113 | td_verror(td, errno); | |
114 | if (!r) | |
115 | r = -1; | |
116 | break; | |
117 | } else if (!ret) | |
118 | continue; | |
119 | ||
dc0deca2 | 120 | if (pollin_events(sd->pfds, td->nr_files)) |
2866c82d JA |
121 | break; |
122 | } while (1); | |
123 | ||
adee86c5 | 124 | if (r < 0) |
2866c82d | 125 | break; |
adee86c5 JA |
126 | |
127 | re_read: | |
128 | p = buf; | |
129 | events = 0; | |
130 | for_each_file(td, f, i) { | |
131 | ret = read(f->fd, p, left * sizeof(struct sg_io_hdr)); | |
132 | if (ret < 0) { | |
133 | if (errno == EAGAIN) | |
134 | continue; | |
135 | td_verror(td, errno); | |
136 | r = -1; | |
137 | break; | |
138 | } else if (ret) { | |
139 | p += ret; | |
140 | events += ret / sizeof(struct sg_io_hdr); | |
141 | } | |
142 | } | |
143 | ||
144 | if (r < 0) | |
2866c82d | 145 | break; |
adee86c5 JA |
146 | if (!events) { |
147 | usleep(1000); | |
148 | goto re_read; | |
149 | } | |
2866c82d | 150 | |
2866c82d JA |
151 | left -= events; |
152 | r += events; | |
153 | ||
154 | for (i = 0; i < events; i++) { | |
155 | struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i; | |
156 | ||
157 | sd->events[i] = hdr->usr_ptr; | |
158 | } | |
159 | } | |
160 | ||
adee86c5 JA |
161 | if (!min) { |
162 | for_each_file(td, f, i) | |
dc0deca2 | 163 | fcntl(f->fd, F_SETFL, sd->fd_flags[i]); |
adee86c5 | 164 | } |
2866c82d | 165 | |
2866c82d JA |
166 | return r; |
167 | } | |
168 | ||
7a16dd02 JA |
169 | static int fio_sgio_ioctl_doio(struct thread_data *td, |
170 | struct fio_file *f, struct io_u *io_u) | |
2866c82d JA |
171 | { |
172 | struct sgio_data *sd = td->io_ops->data; | |
173 | struct sg_io_hdr *hdr = &io_u->hdr; | |
174 | ||
175 | sd->events[0] = io_u; | |
176 | ||
53cdc686 | 177 | return ioctl(f->fd, SG_IO, hdr); |
2866c82d JA |
178 | } |
179 | ||
7a16dd02 | 180 | static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync) |
2866c82d JA |
181 | { |
182 | struct sg_io_hdr *hdr = &io_u->hdr; | |
183 | int ret; | |
184 | ||
53cdc686 | 185 | ret = write(f->fd, hdr, sizeof(*hdr)); |
2866c82d JA |
186 | if (ret < 0) |
187 | return errno; | |
188 | ||
189 | if (sync) { | |
53cdc686 | 190 | ret = read(f->fd, hdr, sizeof(*hdr)); |
2866c82d JA |
191 | if (ret < 0) |
192 | return errno; | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int sync) | |
199 | { | |
53cdc686 JA |
200 | struct fio_file *f = io_u->file; |
201 | ||
2866c82d | 202 | if (td->filetype == FIO_TYPE_BD) |
53cdc686 | 203 | return fio_sgio_ioctl_doio(td, f, io_u); |
2866c82d | 204 | |
7a16dd02 | 205 | return fio_sgio_rw_doio(f, io_u, sync); |
2866c82d JA |
206 | } |
207 | ||
2866c82d JA |
208 | static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u) |
209 | { | |
210 | struct sg_io_hdr *hdr = &io_u->hdr; | |
211 | struct sgio_data *sd = td->io_ops->data; | |
212 | int nr_blocks, lba; | |
213 | ||
cec6b55d | 214 | if (io_u->xfer_buflen & (sd->bs - 1)) { |
2866c82d JA |
215 | log_err("read/write not sector aligned\n"); |
216 | return EINVAL; | |
217 | } | |
218 | ||
2866c82d | 219 | if (io_u->ddir == DDIR_READ) { |
87dc1ab1 JA |
220 | sgio_hdr_init(sd, hdr, io_u, 1); |
221 | ||
2866c82d JA |
222 | hdr->dxfer_direction = SG_DXFER_FROM_DEV; |
223 | hdr->cmdp[0] = 0x28; | |
87dc1ab1 JA |
224 | } else if (io_u->ddir == DDIR_WRITE) { |
225 | sgio_hdr_init(sd, hdr, io_u, 1); | |
226 | ||
2866c82d JA |
227 | hdr->dxfer_direction = SG_DXFER_TO_DEV; |
228 | hdr->cmdp[0] = 0x2a; | |
87dc1ab1 JA |
229 | } else { |
230 | sgio_hdr_init(sd, hdr, io_u, 0); | |
231 | ||
232 | hdr->dxfer_direction = SG_DXFER_NONE; | |
233 | hdr->cmdp[0] = 0x35; | |
234 | } | |
235 | ||
236 | if (hdr->dxfer_direction != SG_DXFER_NONE) { | |
cec6b55d | 237 | nr_blocks = io_u->xfer_buflen / sd->bs; |
87dc1ab1 | 238 | lba = io_u->offset / sd->bs; |
1e97cce9 JA |
239 | hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff); |
240 | hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff); | |
241 | hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff); | |
242 | hdr->cmdp[5] = (unsigned char) (lba & 0xff); | |
243 | hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff); | |
244 | hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff); | |
2866c82d JA |
245 | } |
246 | ||
2866c82d JA |
247 | return 0; |
248 | } | |
249 | ||
250 | static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u) | |
251 | { | |
252 | struct sg_io_hdr *hdr = &io_u->hdr; | |
253 | int ret; | |
254 | ||
87dc1ab1 | 255 | ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC); |
2866c82d JA |
256 | |
257 | if (ret < 0) | |
258 | io_u->error = errno; | |
259 | else if (hdr->status) { | |
260 | io_u->resid = hdr->resid; | |
261 | io_u->error = EIO; | |
262 | } | |
263 | ||
95bcd815 JA |
264 | if (io_u->error) { |
265 | td_verror(td, io_u->error); | |
266 | return io_u->error; | |
267 | } | |
268 | ||
269 | return 0; | |
2866c82d JA |
270 | } |
271 | ||
272 | static struct io_u *fio_sgio_event(struct thread_data *td, int event) | |
273 | { | |
274 | struct sgio_data *sd = td->io_ops->data; | |
275 | ||
276 | return sd->events[event]; | |
277 | } | |
278 | ||
279 | static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs) | |
280 | { | |
281 | struct sgio_data *sd = td->io_ops->data; | |
282 | struct io_u *io_u; | |
283 | struct sg_io_hdr *hdr; | |
284 | unsigned char buf[8]; | |
285 | int ret; | |
286 | ||
287 | io_u = __get_io_u(td); | |
6ab9e267 | 288 | io_u->file = &td->files[0]; |
2866c82d JA |
289 | assert(io_u); |
290 | ||
291 | hdr = &io_u->hdr; | |
292 | sgio_hdr_init(sd, hdr, io_u, 0); | |
293 | memset(buf, 0, sizeof(buf)); | |
294 | ||
295 | hdr->cmdp[0] = 0x25; | |
296 | hdr->dxfer_direction = SG_DXFER_FROM_DEV; | |
297 | hdr->dxferp = buf; | |
298 | hdr->dxfer_len = sizeof(buf); | |
299 | ||
300 | ret = fio_sgio_doio(td, io_u, 1); | |
301 | if (ret) { | |
302 | put_io_u(td, io_u); | |
303 | return ret; | |
304 | } | |
305 | ||
306 | *bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; | |
307 | put_io_u(td, io_u); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static void fio_sgio_cleanup(struct thread_data *td) | |
312 | { | |
dc0deca2 JA |
313 | struct sgio_data *sd = td->io_ops->data; |
314 | ||
315 | if (sd) { | |
316 | free(sd->events); | |
317 | free(sd->cmds); | |
318 | free(sd->fd_flags); | |
319 | free(sd->pfds); | |
320 | free(sd->sgbuf); | |
321 | free(sd); | |
322 | ||
2866c82d JA |
323 | td->io_ops->data = NULL; |
324 | } | |
325 | } | |
326 | ||
327 | static int fio_sgio_init(struct thread_data *td) | |
328 | { | |
53cdc686 | 329 | struct fio_file *f = &td->files[0]; |
2866c82d JA |
330 | struct sgio_data *sd; |
331 | unsigned int bs; | |
332 | int ret; | |
333 | ||
334 | sd = malloc(sizeof(*sd)); | |
cb781c75 | 335 | memset(sd, 0, sizeof(*sd)); |
2866c82d | 336 | sd->cmds = malloc(td->iodepth * sizeof(struct sgio_cmd)); |
cb781c75 | 337 | memset(sd->cmds, 0, td->iodepth * sizeof(struct sgio_cmd)); |
2866c82d | 338 | sd->events = malloc(td->iodepth * sizeof(struct io_u *)); |
cb781c75 | 339 | memset(sd->events, 0, td->iodepth * sizeof(struct io_u *)); |
dc0deca2 JA |
340 | sd->pfds = malloc(sizeof(struct pollfd) * td->nr_files); |
341 | memset(sd->pfds, 0, sizeof(struct pollfd) * td->nr_files); | |
342 | sd->fd_flags = malloc(sizeof(int) * td->nr_files); | |
343 | memset(sd->fd_flags, 0, sizeof(int) * td->nr_files); | |
344 | sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->iodepth); | |
345 | memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->iodepth); | |
346 | ||
2866c82d JA |
347 | td->io_ops->data = sd; |
348 | ||
349 | if (td->filetype == FIO_TYPE_BD) { | |
53cdc686 | 350 | if (ioctl(f->fd, BLKSSZGET, &bs) < 0) { |
2866c82d | 351 | td_verror(td, errno); |
cb781c75 | 352 | goto err; |
2866c82d JA |
353 | } |
354 | } else if (td->filetype == FIO_TYPE_CHAR) { | |
355 | int version; | |
356 | ||
53cdc686 | 357 | if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) { |
2866c82d | 358 | td_verror(td, errno); |
cb781c75 | 359 | goto err; |
2866c82d JA |
360 | } |
361 | ||
362 | ret = fio_sgio_get_bs(td, &bs); | |
363 | if (ret) | |
cb781c75 | 364 | goto err; |
2866c82d JA |
365 | } else { |
366 | log_err("ioengine sgio only works on block devices\n"); | |
cb781c75 | 367 | goto err; |
2866c82d JA |
368 | } |
369 | ||
370 | sd->bs = bs; | |
371 | ||
372 | if (td->filetype == FIO_TYPE_BD) | |
373 | td->io_ops->getevents = fio_sgio_ioctl_getevents; | |
374 | else | |
375 | td->io_ops->getevents = fio_sgio_getevents; | |
376 | ||
377 | /* | |
378 | * we want to do it, regardless of whether odirect is set or not | |
379 | */ | |
380 | td->override_sync = 1; | |
381 | return 0; | |
cb781c75 JA |
382 | err: |
383 | free(sd->events); | |
384 | free(sd->cmds); | |
dc0deca2 JA |
385 | free(sd->fd_flags); |
386 | free(sd->pfds); | |
387 | free(sd->sgbuf); | |
cb781c75 | 388 | free(sd); |
e8b8c9f1 | 389 | td->io_ops->data = NULL; |
cb781c75 | 390 | return 1; |
2866c82d JA |
391 | } |
392 | ||
5f350952 | 393 | static struct ioengine_ops ioengine = { |
2866c82d JA |
394 | .name = "sg", |
395 | .version = FIO_IOOPS_VERSION, | |
396 | .init = fio_sgio_init, | |
397 | .prep = fio_sgio_prep, | |
398 | .queue = fio_sgio_queue, | |
399 | .getevents = fio_sgio_getevents, | |
400 | .event = fio_sgio_event, | |
401 | .cleanup = fio_sgio_cleanup, | |
b2a15192 | 402 | .flags = FIO_SYNCIO | FIO_RAWIO, |
2866c82d | 403 | }; |
34cfcdaf JA |
404 | |
405 | #else /* FIO_HAVE_SGIO */ | |
406 | ||
407 | /* | |
408 | * When we have a proper configure system in place, we simply wont build | |
409 | * and install this io engine. For now install a crippled version that | |
410 | * just complains and fails to load. | |
411 | */ | |
412 | static int fio_sgio_init(struct thread_data fio_unused *td) | |
413 | { | |
414 | fprintf(stderr, "fio: sgio not available\n"); | |
415 | return 1; | |
416 | } | |
417 | ||
5f350952 | 418 | static struct ioengine_ops ioengine = { |
34cfcdaf JA |
419 | .name = "sgio", |
420 | .version = FIO_IOOPS_VERSION, | |
421 | .init = fio_sgio_init, | |
422 | }; | |
423 | ||
424 | #endif | |
5f350952 JA |
425 | |
426 | static void fio_init fio_sgio_register(void) | |
427 | { | |
428 | register_ioengine(&ioengine); | |
429 | } | |
430 | ||
431 | static void fio_exit fio_sgio_unregister(void) | |
432 | { | |
433 | unregister_ioengine(&ioengine); | |
434 | } |