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 | ||
bf0dc8fa | 20 | struct async_head_user ahu; |
a4f4fdd7 | 21 | struct syslet_uatom **ring; |
9ff9de69 JA |
22 | |
23 | struct syslet_uatom *head, *tail; | |
a4f4fdd7 JA |
24 | }; |
25 | ||
9ff9de69 JA |
26 | static void fio_syslet_complete_atom(struct thread_data *td, |
27 | struct syslet_uatom *atom) | |
28 | { | |
29 | struct syslet_data *sd = td->io_ops->data; | |
5b38ee84 | 30 | struct syslet_uatom *last; |
9ff9de69 | 31 | struct io_u *io_u; |
9ff9de69 JA |
32 | |
33 | /* | |
5b38ee84 JA |
34 | * complete from the beginning of the sequence up to (and |
35 | * including) this atom | |
9ff9de69 | 36 | */ |
5b38ee84 JA |
37 | last = atom; |
38 | io_u = atom->private; | |
39 | atom = io_u->req.head; | |
9ff9de69 JA |
40 | |
41 | /* | |
42 | * now complete in right order | |
43 | */ | |
5b38ee84 | 44 | do { |
9ff9de69 JA |
45 | long ret; |
46 | ||
9ff9de69 JA |
47 | io_u = atom->private; |
48 | ret = *atom->ret_ptr; | |
49 | if (ret > 0) | |
50 | io_u->resid = io_u->xfer_buflen - ret; | |
51 | else if (ret < 0) | |
52 | io_u->error = ret; | |
53 | ||
54 | assert(sd->nr_events < td->iodepth); | |
55 | sd->events[sd->nr_events++] = io_u; | |
9ff9de69 | 56 | |
5b38ee84 JA |
57 | if (atom == last) |
58 | break; | |
9ff9de69 | 59 | |
5b38ee84 JA |
60 | atom = atom->next; |
61 | } while (1); | |
62 | ||
63 | assert(!last->next); | |
9ff9de69 JA |
64 | } |
65 | ||
a4f4fdd7 JA |
66 | /* |
67 | * Inspect the ring to see if we have completed events | |
68 | */ | |
69 | static void fio_syslet_complete(struct thread_data *td) | |
70 | { | |
71 | struct syslet_data *sd = td->io_ops->data; | |
72 | ||
73 | do { | |
74 | struct syslet_uatom *atom; | |
a4f4fdd7 | 75 | |
bf0dc8fa | 76 | atom = sd->ring[sd->ahu.user_ring_idx]; |
a4f4fdd7 JA |
77 | if (!atom) |
78 | break; | |
79 | ||
bf0dc8fa IM |
80 | sd->ring[sd->ahu.user_ring_idx] = NULL; |
81 | if (++sd->ahu.user_ring_idx == td->iodepth) | |
82 | sd->ahu.user_ring_idx = 0; | |
a4f4fdd7 | 83 | |
9ff9de69 | 84 | fio_syslet_complete_atom(td, atom); |
a4f4fdd7 JA |
85 | } while (1); |
86 | } | |
87 | ||
88 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
89 | int fio_unused max, | |
90 | struct timespec fio_unused *t) | |
91 | { | |
92 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
93 | long ret; |
94 | ||
95 | do { | |
96 | fio_syslet_complete(td); | |
97 | ||
98 | /* | |
99 | * do we have enough immediate completions? | |
100 | */ | |
101 | if (sd->nr_events >= (unsigned int) min) | |
102 | break; | |
103 | ||
104 | /* | |
105 | * OK, we need to wait for some events... | |
106 | */ | |
9ff9de69 | 107 | ret = async_wait(1, sd->ahu.user_ring_idx, &sd->ahu); |
a4f4fdd7 | 108 | if (ret < 0) |
e49499f8 | 109 | return -errno; |
a4f4fdd7 JA |
110 | } while (1); |
111 | ||
112 | ret = sd->nr_events; | |
113 | sd->nr_events = 0; | |
114 | return ret; | |
115 | } | |
116 | ||
117 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
118 | { | |
119 | struct syslet_data *sd = td->io_ops->data; | |
120 | ||
121 | return sd->events[event]; | |
122 | } | |
123 | ||
124 | static void init_atom(struct syslet_uatom *atom, int nr, void *arg0, | |
a2e1b08a JA |
125 | void *arg1, void *arg2, void *arg3, void *ret_ptr, |
126 | unsigned long flags, void *priv) | |
a4f4fdd7 JA |
127 | { |
128 | atom->flags = flags; | |
129 | atom->nr = nr; | |
130 | atom->ret_ptr = ret_ptr; | |
a2e1b08a | 131 | atom->next = NULL; |
a4f4fdd7 JA |
132 | atom->arg_ptr[0] = arg0; |
133 | atom->arg_ptr[1] = arg1; | |
134 | atom->arg_ptr[2] = arg2; | |
a2e1b08a JA |
135 | atom->arg_ptr[3] = arg3; |
136 | atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; | |
a4f4fdd7 JA |
137 | atom->private = priv; |
138 | } | |
139 | ||
140 | /* | |
141 | * Use seek atom for sync | |
142 | */ | |
143 | static void fio_syslet_prep_sync(struct io_u *io_u, struct fio_file *f) | |
144 | { | |
a2e1b08a | 145 | init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL, |
7d44a745 | 146 | &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
147 | } |
148 | ||
149 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) | |
150 | { | |
151 | int nr; | |
152 | ||
a4f4fdd7 JA |
153 | /* |
154 | * prepare rw | |
155 | */ | |
156 | if (io_u->ddir == DDIR_READ) | |
a2e1b08a | 157 | nr = __NR_pread64; |
a4f4fdd7 | 158 | else |
a2e1b08a | 159 | nr = __NR_pwrite64; |
a4f4fdd7 | 160 | |
a2e1b08a | 161 | init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf, |
7d44a745 | 162 | &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u); |
a4f4fdd7 JA |
163 | } |
164 | ||
165 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) | |
166 | { | |
167 | struct fio_file *f = io_u->file; | |
168 | ||
169 | if (io_u->ddir == DDIR_SYNC) | |
170 | fio_syslet_prep_sync(io_u, f); | |
171 | else | |
172 | fio_syslet_prep_rw(io_u, f); | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
bf0dc8fa IM |
177 | static void cachemiss_thread_start(void) |
178 | { | |
179 | while (1) | |
7756b0d0 | 180 | async_thread(NULL, NULL); |
bf0dc8fa IM |
181 | } |
182 | ||
183 | #define THREAD_STACK_SIZE (16384) | |
184 | ||
185 | static unsigned long thread_stack_alloc() | |
186 | { | |
5b38ee84 | 187 | return (unsigned long) malloc(THREAD_STACK_SIZE) + THREAD_STACK_SIZE; |
bf0dc8fa IM |
188 | } |
189 | ||
9ff9de69 | 190 | static int fio_syslet_commit(struct thread_data *td) |
a4f4fdd7 JA |
191 | { |
192 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 193 | struct syslet_uatom *done; |
9ff9de69 JA |
194 | |
195 | if (!sd->head) | |
196 | return 0; | |
a4f4fdd7 | 197 | |
5b38ee84 JA |
198 | assert(!sd->tail->next); |
199 | ||
bf0dc8fa IM |
200 | if (!sd->ahu.new_thread_stack) |
201 | sd->ahu.new_thread_stack = thread_stack_alloc(); | |
202 | ||
7d44a745 JA |
203 | /* |
204 | * On sync completion, the atom is returned. So on NULL return | |
205 | * it's queued asynchronously. | |
206 | */ | |
9ff9de69 | 207 | done = async_exec(sd->head, &sd->ahu); |
bf0dc8fa | 208 | |
9ff9de69 | 209 | sd->head = sd->tail = NULL; |
a4f4fdd7 | 210 | |
9ff9de69 JA |
211 | if (done) |
212 | fio_syslet_complete_atom(td, done); | |
a4f4fdd7 | 213 | |
9ff9de69 JA |
214 | return 0; |
215 | } | |
216 | ||
217 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
218 | { | |
219 | struct syslet_data *sd = td->io_ops->data; | |
bf0dc8fa | 220 | |
9ff9de69 JA |
221 | if (sd->tail) { |
222 | sd->tail->next = &io_u->req.atom; | |
223 | sd->tail = &io_u->req.atom; | |
224 | } else | |
225 | sd->head = sd->tail = &io_u->req.atom; | |
a4f4fdd7 | 226 | |
5b38ee84 | 227 | io_u->req.head = sd->head; |
9ff9de69 | 228 | return FIO_Q_QUEUED; |
a4f4fdd7 JA |
229 | } |
230 | ||
db64e9bc | 231 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
a4f4fdd7 | 232 | { |
a4f4fdd7 JA |
233 | unsigned long ring_size; |
234 | ||
bf0dc8fa | 235 | memset(&sd->ahu, 0, sizeof(struct async_head_user)); |
2ca50be4 | 236 | |
a4f4fdd7 JA |
237 | ring_size = sizeof(struct syslet_uatom *) * depth; |
238 | sd->ring = malloc(ring_size); | |
239 | memset(sd->ring, 0, ring_size); | |
240 | ||
bf0dc8fa IM |
241 | sd->ahu.user_ring_idx = 0; |
242 | sd->ahu.completion_ring = sd->ring; | |
243 | sd->ahu.ring_size_bytes = ring_size; | |
244 | sd->ahu.head_stack = thread_stack_alloc(); | |
5b38ee84 JA |
245 | sd->ahu.head_eip = (unsigned long) cachemiss_thread_start; |
246 | sd->ahu.new_thread_eip = (unsigned long) cachemiss_thread_start; | |
db64e9bc JA |
247 | |
248 | return 0; | |
a4f4fdd7 JA |
249 | } |
250 | ||
2ca50be4 | 251 | static void async_head_exit(struct syslet_data *sd) |
a4f4fdd7 | 252 | { |
7f059a76 | 253 | free(sd->ring); |
a4f4fdd7 JA |
254 | } |
255 | ||
256 | static void fio_syslet_cleanup(struct thread_data *td) | |
257 | { | |
258 | struct syslet_data *sd = td->io_ops->data; | |
259 | ||
260 | if (sd) { | |
2ca50be4 | 261 | async_head_exit(sd); |
a4f4fdd7 JA |
262 | free(sd->events); |
263 | free(sd); | |
264 | td->io_ops->data = NULL; | |
265 | } | |
266 | } | |
267 | ||
268 | static int fio_syslet_init(struct thread_data *td) | |
269 | { | |
270 | struct syslet_data *sd; | |
271 | ||
db64e9bc | 272 | |
a4f4fdd7 JA |
273 | sd = malloc(sizeof(*sd)); |
274 | memset(sd, 0, sizeof(*sd)); | |
275 | sd->events = malloc(sizeof(struct io_u *) * td->iodepth); | |
276 | memset(sd->events, 0, sizeof(struct io_u *) * td->iodepth); | |
db64e9bc JA |
277 | |
278 | /* | |
279 | * This will handily fail for kernels where syslet isn't available | |
280 | */ | |
281 | if (async_head_init(sd, td->iodepth)) { | |
282 | free(sd->events); | |
283 | free(sd); | |
284 | return 1; | |
285 | } | |
286 | ||
a4f4fdd7 | 287 | td->io_ops->data = sd; |
a4f4fdd7 JA |
288 | return 0; |
289 | } | |
290 | ||
291 | static struct ioengine_ops ioengine = { | |
292 | .name = "syslet-rw", | |
293 | .version = FIO_IOOPS_VERSION, | |
294 | .init = fio_syslet_init, | |
295 | .prep = fio_syslet_prep, | |
296 | .queue = fio_syslet_queue, | |
9ff9de69 | 297 | .commit = fio_syslet_commit, |
a4f4fdd7 JA |
298 | .getevents = fio_syslet_getevents, |
299 | .event = fio_syslet_event, | |
300 | .cleanup = fio_syslet_cleanup, | |
301 | }; | |
302 | ||
303 | #else /* FIO_HAVE_SYSLET */ | |
304 | ||
305 | /* | |
306 | * When we have a proper configure system in place, we simply wont build | |
307 | * and install this io engine. For now install a crippled version that | |
308 | * just complains and fails to load. | |
309 | */ | |
310 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
311 | { | |
312 | fprintf(stderr, "fio: syslet not available\n"); | |
313 | return 1; | |
314 | } | |
315 | ||
316 | static struct ioengine_ops ioengine = { | |
317 | .name = "syslet-rw", | |
318 | .version = FIO_IOOPS_VERSION, | |
319 | .init = fio_syslet_init, | |
320 | }; | |
321 | ||
322 | #endif /* FIO_HAVE_SYSLET */ | |
323 | ||
324 | static void fio_init fio_syslet_register(void) | |
325 | { | |
326 | register_ioengine(&ioengine); | |
327 | } | |
328 | ||
329 | static void fio_exit fio_syslet_unregister(void) | |
330 | { | |
331 | unregister_ioengine(&ioengine); | |
332 | } |