Commit | Line | Data |
---|---|---|
a4f4fdd7 JA |
1 | /* |
2 | * read/write() engine that uses syslet to be async | |
3 | * | |
4 | */ | |
5 | #include <stdio.h> | |
6 | #include <stdlib.h> | |
7 | #include <unistd.h> | |
8 | #include <errno.h> | |
9 | #include <assert.h> | |
10 | ||
11 | #include "../fio.h" | |
12 | #include "../os.h" | |
13 | ||
14 | #ifdef FIO_HAVE_SYSLET | |
15 | ||
16 | struct syslet_data { | |
17 | struct io_u **events; | |
18 | unsigned int nr_events; | |
19 | ||
20 | struct syslet_uatom **ring; | |
21 | unsigned int ring_index; | |
22 | }; | |
23 | ||
24 | /* | |
25 | * Inspect the ring to see if we have completed events | |
26 | */ | |
27 | static void fio_syslet_complete(struct thread_data *td) | |
28 | { | |
29 | struct syslet_data *sd = td->io_ops->data; | |
30 | ||
31 | do { | |
32 | struct syslet_uatom *atom; | |
33 | struct io_u *io_u; | |
34 | long ret; | |
35 | ||
36 | atom = sd->ring[sd->ring_index]; | |
37 | if (!atom) | |
38 | break; | |
39 | ||
40 | sd->ring[sd->ring_index] = NULL; | |
41 | if (++sd->ring_index == td->iodepth) | |
42 | sd->ring_index = 0; | |
43 | ||
44 | io_u = atom->private; | |
45 | ret = *atom->ret_ptr; | |
46 | if (ret > 0) | |
47 | io_u->resid = io_u->xfer_buflen - ret; | |
48 | else if (ret < 0) | |
49 | io_u->error = ret; | |
50 | ||
51 | sd->events[sd->nr_events++] = io_u; | |
52 | } while (1); | |
53 | } | |
54 | ||
55 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
56 | int fio_unused max, | |
57 | struct timespec fio_unused *t) | |
58 | { | |
59 | struct syslet_data *sd = td->io_ops->data; | |
60 | int get_events; | |
61 | long ret; | |
62 | ||
63 | do { | |
64 | fio_syslet_complete(td); | |
65 | ||
66 | /* | |
67 | * do we have enough immediate completions? | |
68 | */ | |
69 | if (sd->nr_events >= (unsigned int) min) | |
70 | break; | |
71 | ||
72 | /* | |
73 | * OK, we need to wait for some events... | |
74 | */ | |
75 | get_events = min - sd->nr_events; | |
76 | ret = async_wait(get_events); | |
77 | if (ret < 0) | |
78 | return errno; | |
79 | } while (1); | |
80 | ||
81 | ret = sd->nr_events; | |
82 | sd->nr_events = 0; | |
83 | return ret; | |
84 | } | |
85 | ||
86 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
87 | { | |
88 | struct syslet_data *sd = td->io_ops->data; | |
89 | ||
90 | return sd->events[event]; | |
91 | } | |
92 | ||
93 | static void init_atom(struct syslet_uatom *atom, int nr, void *arg0, | |
94 | void *arg1, void *arg2, void *ret_ptr, | |
95 | unsigned long flags, void *priv,struct syslet_uatom *next) | |
96 | { | |
97 | atom->flags = flags; | |
98 | atom->nr = nr; | |
99 | atom->ret_ptr = ret_ptr; | |
100 | atom->next = next; | |
101 | atom->arg_ptr[0] = arg0; | |
102 | atom->arg_ptr[1] = arg1; | |
103 | atom->arg_ptr[2] = arg2; | |
104 | atom->arg_ptr[3] = atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; | |
105 | atom->private = priv; | |
106 | } | |
107 | ||
108 | /* | |
109 | * Use seek atom for sync | |
110 | */ | |
111 | static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f) | |
112 | { | |
113 | init_atom(&io_u->seek_atom.atom, __NR_fsync, &f->fd, NULL, NULL, | |
114 | &io_u->seek_atom.ret, SYSLET_STOP_ON_NEGATIVE, io_u, NULL); | |
115 | } | |
116 | ||
117 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) | |
118 | { | |
119 | int nr; | |
120 | ||
121 | /* | |
122 | * prepare seek | |
123 | */ | |
124 | io_u->seek_atom.cmd = SEEK_SET; | |
125 | init_atom(&io_u->seek_atom.atom, __NR_lseek, &f->fd, &io_u->offset, | |
126 | &io_u->seek_atom.cmd, &io_u->seek_atom.ret, | |
127 | SYSLET_STOP_ON_NEGATIVE | SYSLET_NO_COMPLETE | | |
128 | SYSLET_SKIP_TO_NEXT_ON_STOP, | |
129 | NULL, &io_u->rw_atom.atom); | |
130 | ||
131 | /* | |
132 | * prepare rw | |
133 | */ | |
134 | if (io_u->ddir == DDIR_READ) | |
135 | nr = __NR_read; | |
136 | else | |
137 | nr = __NR_write; | |
138 | ||
139 | init_atom(&io_u->rw_atom.atom, nr, &f->fd, &io_u->xfer_buf, | |
140 | &io_u->xfer_buflen, &io_u->rw_atom.ret, | |
141 | SYSLET_STOP_ON_NEGATIVE | SYSLET_SKIP_TO_NEXT_ON_STOP, | |
142 | io_u, NULL); | |
143 | } | |
144 | ||
145 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) | |
146 | { | |
147 | struct fio_file *f = io_u->file; | |
148 | ||
149 | if (io_u->ddir == DDIR_SYNC) | |
150 | fio_syslet_prep_sync(io_u, f); | |
151 | else | |
152 | fio_syslet_prep_rw(io_u, f); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | ||
157 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
158 | { | |
159 | struct syslet_data *sd = td->io_ops->data; | |
160 | struct syslet_uatom *done; | |
161 | long ret; | |
162 | ||
163 | done = async_exec(&io_u->seek_atom.atom); | |
164 | if (!done) | |
165 | return 0; | |
166 | ||
167 | /* | |
168 | * completed sync | |
169 | */ | |
170 | ret = io_u->rw_atom.ret; | |
171 | if (ret != (long) io_u->xfer_buflen) { | |
172 | if (ret > 0) { | |
173 | io_u->resid = io_u->xfer_buflen - ret; | |
174 | io_u->error = 0; | |
175 | return ret; | |
176 | } else | |
177 | io_u->error = errno; | |
178 | } | |
179 | ||
180 | if (!io_u->error) | |
181 | sd->events[sd->nr_events++] = io_u; | |
182 | else | |
183 | td_verror(td, io_u->error); | |
184 | ||
185 | return io_u->error; | |
186 | } | |
187 | ||
db64e9bc | 188 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
a4f4fdd7 JA |
189 | { |
190 | struct async_head_user ahu; | |
191 | unsigned long ring_size; | |
192 | ||
193 | ring_size = sizeof(struct syslet_uatom *) * depth; | |
194 | sd->ring = malloc(ring_size); | |
195 | memset(sd->ring, 0, ring_size); | |
196 | ||
197 | memset(&ahu, 0, sizeof(ahu)); | |
198 | ahu.completion_ring = sd->ring; | |
199 | ahu.ring_size_bytes = ring_size; | |
200 | ahu.max_nr_threads = -1; | |
201 | ||
db64e9bc | 202 | if (async_register(&ahu, sizeof(ahu)) < 0) { |
a4f4fdd7 | 203 | perror("async_register"); |
db64e9bc JA |
204 | fprintf(stderr, "fio: syslet likely not supported\n"); |
205 | free(sd->ring); | |
206 | return 1; | |
207 | } | |
208 | ||
209 | return 0; | |
a4f4fdd7 JA |
210 | } |
211 | ||
212 | static void async_head_exit(struct syslet_data *sd, unsigned int depth) | |
213 | { | |
214 | struct async_head_user ahu; | |
215 | ||
216 | memset(&ahu, 0, sizeof(ahu)); | |
217 | ahu.completion_ring = sd->ring; | |
218 | ahu.ring_size_bytes = sizeof(struct syslet_uatom *) * depth; | |
219 | ||
220 | if (async_unregister(&ahu, sizeof(ahu)) < 0) | |
221 | perror("async_register"); | |
222 | } | |
223 | ||
224 | static void fio_syslet_cleanup(struct thread_data *td) | |
225 | { | |
226 | struct syslet_data *sd = td->io_ops->data; | |
227 | ||
228 | if (sd) { | |
229 | async_head_exit(sd, td->iodepth); | |
230 | free(sd->events); | |
231 | free(sd); | |
232 | td->io_ops->data = NULL; | |
233 | } | |
234 | } | |
235 | ||
236 | static int fio_syslet_init(struct thread_data *td) | |
237 | { | |
238 | struct syslet_data *sd; | |
239 | ||
db64e9bc | 240 | |
a4f4fdd7 JA |
241 | sd = malloc(sizeof(*sd)); |
242 | memset(sd, 0, sizeof(*sd)); | |
243 | sd->events = malloc(sizeof(struct io_u *) * td->iodepth); | |
244 | memset(sd->events, 0, sizeof(struct io_u *) * td->iodepth); | |
db64e9bc JA |
245 | |
246 | /* | |
247 | * This will handily fail for kernels where syslet isn't available | |
248 | */ | |
249 | if (async_head_init(sd, td->iodepth)) { | |
250 | free(sd->events); | |
251 | free(sd); | |
252 | return 1; | |
253 | } | |
254 | ||
a4f4fdd7 | 255 | td->io_ops->data = sd; |
a4f4fdd7 JA |
256 | return 0; |
257 | } | |
258 | ||
259 | static struct ioengine_ops ioengine = { | |
260 | .name = "syslet-rw", | |
261 | .version = FIO_IOOPS_VERSION, | |
262 | .init = fio_syslet_init, | |
263 | .prep = fio_syslet_prep, | |
264 | .queue = fio_syslet_queue, | |
265 | .getevents = fio_syslet_getevents, | |
266 | .event = fio_syslet_event, | |
267 | .cleanup = fio_syslet_cleanup, | |
268 | }; | |
269 | ||
270 | #else /* FIO_HAVE_SYSLET */ | |
271 | ||
272 | /* | |
273 | * When we have a proper configure system in place, we simply wont build | |
274 | * and install this io engine. For now install a crippled version that | |
275 | * just complains and fails to load. | |
276 | */ | |
277 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
278 | { | |
279 | fprintf(stderr, "fio: syslet not available\n"); | |
280 | return 1; | |
281 | } | |
282 | ||
283 | static struct ioengine_ops ioengine = { | |
284 | .name = "syslet-rw", | |
285 | .version = FIO_IOOPS_VERSION, | |
286 | .init = fio_syslet_init, | |
287 | }; | |
288 | ||
289 | #endif /* FIO_HAVE_SYSLET */ | |
290 | ||
291 | static void fio_init fio_syslet_register(void) | |
292 | { | |
293 | register_ioengine(&ioengine); | |
294 | } | |
295 | ||
296 | static void fio_exit fio_syslet_unregister(void) | |
297 | { | |
298 | unregister_ioengine(&ioengine); | |
299 | } |