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