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 | ||
2ca50be4 | 20 | struct async_head_user *ahu; |
a4f4fdd7 JA |
21 | struct syslet_uatom **ring; |
22 | unsigned int ring_index; | |
23 | }; | |
24 | ||
25 | /* | |
26 | * Inspect the ring to see if we have completed events | |
27 | */ | |
28 | static void fio_syslet_complete(struct thread_data *td) | |
29 | { | |
30 | struct syslet_data *sd = td->io_ops->data; | |
31 | ||
32 | do { | |
33 | struct syslet_uatom *atom; | |
34 | struct io_u *io_u; | |
35 | long ret; | |
36 | ||
37 | atom = sd->ring[sd->ring_index]; | |
38 | if (!atom) | |
39 | break; | |
40 | ||
41 | sd->ring[sd->ring_index] = NULL; | |
42 | if (++sd->ring_index == td->iodepth) | |
43 | sd->ring_index = 0; | |
44 | ||
45 | io_u = atom->private; | |
46 | ret = *atom->ret_ptr; | |
47 | if (ret > 0) | |
48 | io_u->resid = io_u->xfer_buflen - ret; | |
49 | else if (ret < 0) | |
50 | io_u->error = ret; | |
51 | ||
52 | sd->events[sd->nr_events++] = io_u; | |
53 | } while (1); | |
54 | } | |
55 | ||
56 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
57 | int fio_unused max, | |
58 | struct timespec fio_unused *t) | |
59 | { | |
60 | struct syslet_data *sd = td->io_ops->data; | |
61 | int get_events; | |
62 | long ret; | |
63 | ||
64 | do { | |
65 | fio_syslet_complete(td); | |
66 | ||
67 | /* | |
68 | * do we have enough immediate completions? | |
69 | */ | |
70 | if (sd->nr_events >= (unsigned int) min) | |
71 | break; | |
72 | ||
73 | /* | |
74 | * OK, we need to wait for some events... | |
75 | */ | |
76 | get_events = min - sd->nr_events; | |
77 | ret = async_wait(get_events); | |
78 | if (ret < 0) | |
79 | return errno; | |
80 | } while (1); | |
81 | ||
82 | ret = sd->nr_events; | |
83 | sd->nr_events = 0; | |
84 | return ret; | |
85 | } | |
86 | ||
87 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
88 | { | |
89 | struct syslet_data *sd = td->io_ops->data; | |
90 | ||
91 | return sd->events[event]; | |
92 | } | |
93 | ||
94 | static void init_atom(struct syslet_uatom *atom, int nr, void *arg0, | |
a2e1b08a JA |
95 | void *arg1, void *arg2, void *arg3, void *ret_ptr, |
96 | unsigned long flags, void *priv) | |
a4f4fdd7 JA |
97 | { |
98 | atom->flags = flags; | |
99 | atom->nr = nr; | |
100 | atom->ret_ptr = ret_ptr; | |
a2e1b08a | 101 | atom->next = NULL; |
a4f4fdd7 JA |
102 | atom->arg_ptr[0] = arg0; |
103 | atom->arg_ptr[1] = arg1; | |
104 | atom->arg_ptr[2] = arg2; | |
a2e1b08a JA |
105 | atom->arg_ptr[3] = arg3; |
106 | atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; | |
a4f4fdd7 JA |
107 | atom->private = priv; |
108 | } | |
109 | ||
110 | /* | |
111 | * Use seek atom for sync | |
112 | */ | |
113 | static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f) | |
114 | { | |
a2e1b08a JA |
115 | init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL, |
116 | &io_u->req.ret, SYSLET_STOP_ON_NEGATIVE, io_u); | |
a4f4fdd7 JA |
117 | } |
118 | ||
119 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) | |
120 | { | |
121 | int nr; | |
122 | ||
a4f4fdd7 JA |
123 | /* |
124 | * prepare rw | |
125 | */ | |
126 | if (io_u->ddir == DDIR_READ) | |
a2e1b08a | 127 | nr = __NR_pread64; |
a4f4fdd7 | 128 | else |
a2e1b08a | 129 | nr = __NR_pwrite64; |
a4f4fdd7 | 130 | |
a2e1b08a JA |
131 | init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf, |
132 | &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, | |
133 | SYSLET_STOP_ON_NEGATIVE, io_u); | |
a4f4fdd7 JA |
134 | } |
135 | ||
136 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) | |
137 | { | |
138 | struct fio_file *f = io_u->file; | |
139 | ||
140 | if (io_u->ddir == DDIR_SYNC) | |
141 | fio_syslet_prep_sync(io_u, f); | |
142 | else | |
143 | fio_syslet_prep_rw(io_u, f); | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
148 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
149 | { | |
150 | struct syslet_data *sd = td->io_ops->data; | |
151 | struct syslet_uatom *done; | |
152 | long ret; | |
153 | ||
a2e1b08a | 154 | done = async_exec(&io_u->req.atom); |
a4f4fdd7 JA |
155 | if (!done) |
156 | return 0; | |
157 | ||
158 | /* | |
159 | * completed sync | |
160 | */ | |
a2e1b08a | 161 | ret = io_u->req.ret; |
a4f4fdd7 JA |
162 | if (ret != (long) io_u->xfer_buflen) { |
163 | if (ret > 0) { | |
164 | io_u->resid = io_u->xfer_buflen - ret; | |
165 | io_u->error = 0; | |
166 | return ret; | |
167 | } else | |
168 | io_u->error = errno; | |
169 | } | |
170 | ||
171 | if (!io_u->error) | |
172 | sd->events[sd->nr_events++] = io_u; | |
173 | else | |
174 | td_verror(td, io_u->error); | |
175 | ||
176 | return io_u->error; | |
177 | } | |
178 | ||
db64e9bc | 179 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
a4f4fdd7 | 180 | { |
a4f4fdd7 JA |
181 | unsigned long ring_size; |
182 | ||
2ca50be4 JA |
183 | sd->ahu = malloc(sizeof(struct async_head_user)); |
184 | memset(sd->ahu, 0, sizeof(struct async_head_user)); | |
185 | ||
a4f4fdd7 JA |
186 | ring_size = sizeof(struct syslet_uatom *) * depth; |
187 | sd->ring = malloc(ring_size); | |
188 | memset(sd->ring, 0, ring_size); | |
189 | ||
2ca50be4 JA |
190 | sd->ahu->completion_ring = sd->ring; |
191 | sd->ahu->ring_size_bytes = ring_size; | |
192 | sd->ahu->max_nr_threads = -1; | |
a4f4fdd7 | 193 | |
2ca50be4 | 194 | if (async_register(sd->ahu, sizeof(*sd->ahu)) < 0) { |
a4f4fdd7 | 195 | perror("async_register"); |
db64e9bc JA |
196 | fprintf(stderr, "fio: syslet likely not supported\n"); |
197 | free(sd->ring); | |
2ca50be4 | 198 | free(sd->ahu); |
db64e9bc JA |
199 | return 1; |
200 | } | |
201 | ||
202 | return 0; | |
a4f4fdd7 JA |
203 | } |
204 | ||
2ca50be4 | 205 | static void async_head_exit(struct syslet_data *sd) |
a4f4fdd7 | 206 | { |
2ca50be4 | 207 | if (async_unregister(sd->ahu, sizeof(*sd->ahu)) < 0) |
a4f4fdd7 | 208 | perror("async_register"); |
7f059a76 JA |
209 | |
210 | free(sd->ahu); | |
211 | free(sd->ring); | |
a4f4fdd7 JA |
212 | } |
213 | ||
214 | static void fio_syslet_cleanup(struct thread_data *td) | |
215 | { | |
216 | struct syslet_data *sd = td->io_ops->data; | |
217 | ||
218 | if (sd) { | |
2ca50be4 | 219 | async_head_exit(sd); |
a4f4fdd7 JA |
220 | free(sd->events); |
221 | free(sd); | |
222 | td->io_ops->data = NULL; | |
223 | } | |
224 | } | |
225 | ||
226 | static int fio_syslet_init(struct thread_data *td) | |
227 | { | |
228 | struct syslet_data *sd; | |
229 | ||
db64e9bc | 230 | |
a4f4fdd7 JA |
231 | sd = malloc(sizeof(*sd)); |
232 | memset(sd, 0, sizeof(*sd)); | |
233 | sd->events = malloc(sizeof(struct io_u *) * td->iodepth); | |
234 | memset(sd->events, 0, sizeof(struct io_u *) * td->iodepth); | |
db64e9bc JA |
235 | |
236 | /* | |
237 | * This will handily fail for kernels where syslet isn't available | |
238 | */ | |
239 | if (async_head_init(sd, td->iodepth)) { | |
240 | free(sd->events); | |
241 | free(sd); | |
242 | return 1; | |
243 | } | |
244 | ||
a4f4fdd7 | 245 | td->io_ops->data = sd; |
a4f4fdd7 JA |
246 | return 0; |
247 | } | |
248 | ||
249 | static struct ioengine_ops ioengine = { | |
250 | .name = "syslet-rw", | |
251 | .version = FIO_IOOPS_VERSION, | |
252 | .init = fio_syslet_init, | |
253 | .prep = fio_syslet_prep, | |
254 | .queue = fio_syslet_queue, | |
255 | .getevents = fio_syslet_getevents, | |
256 | .event = fio_syslet_event, | |
257 | .cleanup = fio_syslet_cleanup, | |
258 | }; | |
259 | ||
260 | #else /* FIO_HAVE_SYSLET */ | |
261 | ||
262 | /* | |
263 | * When we have a proper configure system in place, we simply wont build | |
264 | * and install this io engine. For now install a crippled version that | |
265 | * just complains and fails to load. | |
266 | */ | |
267 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
268 | { | |
269 | fprintf(stderr, "fio: syslet not available\n"); | |
270 | return 1; | |
271 | } | |
272 | ||
273 | static struct ioengine_ops ioengine = { | |
274 | .name = "syslet-rw", | |
275 | .version = FIO_IOOPS_VERSION, | |
276 | .init = fio_syslet_init, | |
277 | }; | |
278 | ||
279 | #endif /* FIO_HAVE_SYSLET */ | |
280 | ||
281 | static void fio_init fio_syslet_register(void) | |
282 | { | |
283 | register_ioengine(&ioengine); | |
284 | } | |
285 | ||
286 | static void fio_exit fio_syslet_unregister(void) | |
287 | { | |
288 | unregister_ioengine(&ioengine); | |
289 | } |