Commit | Line | Data |
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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> | |
11 | #include "fio.h" | |
12 | #include "os.h" | |
13 | ||
34cfcdaf JA |
14 | #ifdef FIO_HAVE_SGIO |
15 | ||
2866c82d JA |
16 | struct sgio_cmd { |
17 | unsigned char cdb[10]; | |
18 | int nr; | |
19 | }; | |
20 | ||
21 | struct sgio_data { | |
22 | struct sgio_cmd *cmds; | |
23 | struct io_u **events; | |
24 | unsigned int bs; | |
25 | }; | |
26 | ||
27 | static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr, | |
28 | struct io_u *io_u, int fs) | |
29 | { | |
30 | struct sgio_cmd *sc = &sd->cmds[io_u->index]; | |
31 | ||
32 | memset(hdr, 0, sizeof(*hdr)); | |
33 | memset(sc->cdb, 0, sizeof(sc->cdb)); | |
34 | ||
35 | hdr->interface_id = 'S'; | |
36 | hdr->cmdp = sc->cdb; | |
37 | hdr->cmd_len = sizeof(sc->cdb); | |
38 | hdr->pack_id = io_u->index; | |
39 | hdr->usr_ptr = io_u; | |
40 | ||
41 | if (fs) { | |
42 | hdr->dxferp = io_u->buf; | |
43 | hdr->dxfer_len = io_u->buflen; | |
44 | } | |
45 | } | |
46 | ||
47 | static int fio_sgio_ioctl_getevents(struct thread_data *td, int fio_unused min, | |
48 | int max, struct timespec fio_unused *t) | |
49 | { | |
50 | assert(max <= 1); | |
51 | ||
52 | /* | |
53 | * we can only have one finished io_u for sync io, since the depth | |
54 | * is always 1 | |
55 | */ | |
56 | if (list_empty(&td->io_u_busylist)) | |
57 | return 0; | |
58 | ||
59 | return 1; | |
60 | } | |
61 | ||
62 | ||
63 | static int fio_sgio_getevents(struct thread_data *td, int min, int max, | |
64 | struct timespec fio_unused *t) | |
65 | { | |
53cdc686 | 66 | struct fio_file *f = &td->files[0]; |
2866c82d | 67 | struct sgio_data *sd = td->io_ops->data; |
53cdc686 | 68 | struct pollfd pfd = { .fd = f->fd, .events = POLLIN }; |
2866c82d JA |
69 | void *buf = malloc(max * sizeof(struct sg_io_hdr)); |
70 | int left = max, ret, events, i, r = 0, fl = 0; | |
71 | ||
72 | /* | |
73 | * don't block for !events | |
74 | */ | |
75 | if (!min) { | |
53cdc686 JA |
76 | fl = fcntl(f->fd, F_GETFL); |
77 | fcntl(f->fd, F_SETFL, fl | O_NONBLOCK); | |
2866c82d JA |
78 | } |
79 | ||
80 | while (left) { | |
81 | do { | |
82 | if (!min) | |
83 | break; | |
84 | poll(&pfd, 1, -1); | |
85 | if (pfd.revents & POLLIN) | |
86 | break; | |
87 | } while (1); | |
88 | ||
53cdc686 | 89 | ret = read(f->fd, buf, left * sizeof(struct sg_io_hdr)); |
2866c82d JA |
90 | if (ret < 0) { |
91 | if (errno == EAGAIN) | |
92 | break; | |
93 | td_verror(td, errno); | |
94 | r = -1; | |
95 | break; | |
96 | } else if (!ret) | |
97 | break; | |
98 | ||
99 | events = ret / sizeof(struct sg_io_hdr); | |
100 | left -= events; | |
101 | r += events; | |
102 | ||
103 | for (i = 0; i < events; i++) { | |
104 | struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i; | |
105 | ||
106 | sd->events[i] = hdr->usr_ptr; | |
107 | } | |
108 | } | |
109 | ||
110 | if (!min) | |
53cdc686 | 111 | fcntl(f->fd, F_SETFL, fl); |
2866c82d JA |
112 | |
113 | free(buf); | |
114 | return r; | |
115 | } | |
116 | ||
7a16dd02 JA |
117 | static int fio_sgio_ioctl_doio(struct thread_data *td, |
118 | struct fio_file *f, struct io_u *io_u) | |
2866c82d JA |
119 | { |
120 | struct sgio_data *sd = td->io_ops->data; | |
121 | struct sg_io_hdr *hdr = &io_u->hdr; | |
122 | ||
123 | sd->events[0] = io_u; | |
124 | ||
53cdc686 | 125 | return ioctl(f->fd, SG_IO, hdr); |
2866c82d JA |
126 | } |
127 | ||
7a16dd02 | 128 | static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync) |
2866c82d JA |
129 | { |
130 | struct sg_io_hdr *hdr = &io_u->hdr; | |
131 | int ret; | |
132 | ||
53cdc686 | 133 | ret = write(f->fd, hdr, sizeof(*hdr)); |
2866c82d JA |
134 | if (ret < 0) |
135 | return errno; | |
136 | ||
137 | if (sync) { | |
53cdc686 | 138 | ret = read(f->fd, hdr, sizeof(*hdr)); |
2866c82d JA |
139 | if (ret < 0) |
140 | return errno; | |
141 | } | |
142 | ||
143 | return 0; | |
144 | } | |
145 | ||
146 | static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int sync) | |
147 | { | |
53cdc686 JA |
148 | struct fio_file *f = io_u->file; |
149 | ||
2866c82d | 150 | if (td->filetype == FIO_TYPE_BD) |
53cdc686 | 151 | return fio_sgio_ioctl_doio(td, f, io_u); |
2866c82d | 152 | |
7a16dd02 | 153 | return fio_sgio_rw_doio(f, io_u, sync); |
2866c82d JA |
154 | } |
155 | ||
2866c82d JA |
156 | static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u) |
157 | { | |
158 | struct sg_io_hdr *hdr = &io_u->hdr; | |
159 | struct sgio_data *sd = td->io_ops->data; | |
160 | int nr_blocks, lba; | |
161 | ||
162 | if (io_u->buflen & (sd->bs - 1)) { | |
163 | log_err("read/write not sector aligned\n"); | |
164 | return EINVAL; | |
165 | } | |
166 | ||
2866c82d | 167 | if (io_u->ddir == DDIR_READ) { |
87dc1ab1 JA |
168 | sgio_hdr_init(sd, hdr, io_u, 1); |
169 | ||
2866c82d JA |
170 | hdr->dxfer_direction = SG_DXFER_FROM_DEV; |
171 | hdr->cmdp[0] = 0x28; | |
87dc1ab1 JA |
172 | } else if (io_u->ddir == DDIR_WRITE) { |
173 | sgio_hdr_init(sd, hdr, io_u, 1); | |
174 | ||
2866c82d JA |
175 | hdr->dxfer_direction = SG_DXFER_TO_DEV; |
176 | hdr->cmdp[0] = 0x2a; | |
87dc1ab1 JA |
177 | } else { |
178 | sgio_hdr_init(sd, hdr, io_u, 0); | |
179 | ||
180 | hdr->dxfer_direction = SG_DXFER_NONE; | |
181 | hdr->cmdp[0] = 0x35; | |
182 | } | |
183 | ||
184 | if (hdr->dxfer_direction != SG_DXFER_NONE) { | |
185 | nr_blocks = io_u->buflen / sd->bs; | |
186 | lba = io_u->offset / sd->bs; | |
187 | hdr->cmdp[2] = (lba >> 24) & 0xff; | |
188 | hdr->cmdp[3] = (lba >> 16) & 0xff; | |
189 | hdr->cmdp[4] = (lba >> 8) & 0xff; | |
190 | hdr->cmdp[5] = lba & 0xff; | |
191 | hdr->cmdp[7] = (nr_blocks >> 8) & 0xff; | |
192 | hdr->cmdp[8] = nr_blocks & 0xff; | |
2866c82d JA |
193 | } |
194 | ||
2866c82d JA |
195 | return 0; |
196 | } | |
197 | ||
198 | static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u) | |
199 | { | |
200 | struct sg_io_hdr *hdr = &io_u->hdr; | |
201 | int ret; | |
202 | ||
87dc1ab1 | 203 | ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC); |
2866c82d JA |
204 | |
205 | if (ret < 0) | |
206 | io_u->error = errno; | |
207 | else if (hdr->status) { | |
208 | io_u->resid = hdr->resid; | |
209 | io_u->error = EIO; | |
210 | } | |
211 | ||
212 | return io_u->error; | |
213 | } | |
214 | ||
215 | static struct io_u *fio_sgio_event(struct thread_data *td, int event) | |
216 | { | |
217 | struct sgio_data *sd = td->io_ops->data; | |
218 | ||
219 | return sd->events[event]; | |
220 | } | |
221 | ||
222 | static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs) | |
223 | { | |
224 | struct sgio_data *sd = td->io_ops->data; | |
225 | struct io_u *io_u; | |
226 | struct sg_io_hdr *hdr; | |
227 | unsigned char buf[8]; | |
228 | int ret; | |
229 | ||
230 | io_u = __get_io_u(td); | |
231 | assert(io_u); | |
232 | ||
233 | hdr = &io_u->hdr; | |
234 | sgio_hdr_init(sd, hdr, io_u, 0); | |
235 | memset(buf, 0, sizeof(buf)); | |
236 | ||
237 | hdr->cmdp[0] = 0x25; | |
238 | hdr->dxfer_direction = SG_DXFER_FROM_DEV; | |
239 | hdr->dxferp = buf; | |
240 | hdr->dxfer_len = sizeof(buf); | |
241 | ||
242 | ret = fio_sgio_doio(td, io_u, 1); | |
243 | if (ret) { | |
244 | put_io_u(td, io_u); | |
245 | return ret; | |
246 | } | |
247 | ||
248 | *bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; | |
249 | put_io_u(td, io_u); | |
250 | return 0; | |
251 | } | |
252 | ||
253 | static void fio_sgio_cleanup(struct thread_data *td) | |
254 | { | |
255 | if (td->io_ops->data) { | |
256 | free(td->io_ops->data); | |
257 | td->io_ops->data = NULL; | |
258 | } | |
259 | } | |
260 | ||
261 | static int fio_sgio_init(struct thread_data *td) | |
262 | { | |
53cdc686 | 263 | struct fio_file *f = &td->files[0]; |
2866c82d JA |
264 | struct sgio_data *sd; |
265 | unsigned int bs; | |
266 | int ret; | |
267 | ||
268 | sd = malloc(sizeof(*sd)); | |
269 | sd->cmds = malloc(td->iodepth * sizeof(struct sgio_cmd)); | |
270 | sd->events = malloc(td->iodepth * sizeof(struct io_u *)); | |
271 | td->io_ops->data = sd; | |
272 | ||
273 | if (td->filetype == FIO_TYPE_BD) { | |
53cdc686 | 274 | if (ioctl(f->fd, BLKSSZGET, &bs) < 0) { |
2866c82d JA |
275 | td_verror(td, errno); |
276 | return 1; | |
277 | } | |
278 | } else if (td->filetype == FIO_TYPE_CHAR) { | |
279 | int version; | |
280 | ||
53cdc686 | 281 | if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) { |
2866c82d JA |
282 | td_verror(td, errno); |
283 | return 1; | |
284 | } | |
285 | ||
286 | ret = fio_sgio_get_bs(td, &bs); | |
287 | if (ret) | |
288 | return ret; | |
289 | } else { | |
290 | log_err("ioengine sgio only works on block devices\n"); | |
291 | return 1; | |
292 | } | |
293 | ||
294 | sd->bs = bs; | |
295 | ||
296 | if (td->filetype == FIO_TYPE_BD) | |
297 | td->io_ops->getevents = fio_sgio_ioctl_getevents; | |
298 | else | |
299 | td->io_ops->getevents = fio_sgio_getevents; | |
300 | ||
301 | /* | |
302 | * we want to do it, regardless of whether odirect is set or not | |
303 | */ | |
304 | td->override_sync = 1; | |
305 | return 0; | |
306 | } | |
307 | ||
308 | struct ioengine_ops ioengine = { | |
309 | .name = "sg", | |
310 | .version = FIO_IOOPS_VERSION, | |
311 | .init = fio_sgio_init, | |
312 | .prep = fio_sgio_prep, | |
313 | .queue = fio_sgio_queue, | |
314 | .getevents = fio_sgio_getevents, | |
315 | .event = fio_sgio_event, | |
316 | .cleanup = fio_sgio_cleanup, | |
b2a15192 | 317 | .flags = FIO_SYNCIO | FIO_RAWIO, |
2866c82d | 318 | }; |
34cfcdaf JA |
319 | |
320 | #else /* FIO_HAVE_SGIO */ | |
321 | ||
322 | /* | |
323 | * When we have a proper configure system in place, we simply wont build | |
324 | * and install this io engine. For now install a crippled version that | |
325 | * just complains and fails to load. | |
326 | */ | |
327 | static int fio_sgio_init(struct thread_data fio_unused *td) | |
328 | { | |
329 | fprintf(stderr, "fio: sgio not available\n"); | |
330 | return 1; | |
331 | } | |
332 | ||
333 | struct ioengine_ops ioengine = { | |
334 | .name = "sgio", | |
335 | .version = FIO_IOOPS_VERSION, | |
336 | .init = fio_sgio_init, | |
337 | }; | |
338 | ||
339 | #endif |