Commit | Line | Data |
---|---|---|
a4f4fdd7 | 1 | /* |
da751ca9 JA |
2 | * syslet engine |
3 | * | |
4 | * IO engine that does regular pread(2)/pwrite(2) to transfer data, but | |
5 | * with syslets to make the execution async. | |
a4f4fdd7 JA |
6 | * |
7 | */ | |
8 | #include <stdio.h> | |
9 | #include <stdlib.h> | |
10 | #include <unistd.h> | |
11 | #include <errno.h> | |
12 | #include <assert.h> | |
12cbb469 | 13 | #include <malloc.h> |
b8846354 | 14 | #include <asm/unistd.h> |
a4f4fdd7 JA |
15 | |
16 | #include "../fio.h" | |
12cbb469 JA |
17 | #include "../indirect.h" |
18 | #include "../syslet.h" | |
a4f4fdd7 JA |
19 | |
20 | #ifdef FIO_HAVE_SYSLET | |
21 | ||
1760e679 JA |
22 | #ifdef __NR_pread64 |
23 | #define __NR_fio_pread __NR_pread64 | |
24 | #define __NR_fio_pwrite __NR_pwrite64 | |
25 | #else | |
26 | #define __NR_fio_pread __NR_pread | |
27 | #define __NR_fio_pwrite __NR_pwrite | |
28 | #endif | |
29 | ||
a4f4fdd7 JA |
30 | struct syslet_data { |
31 | struct io_u **events; | |
32 | unsigned int nr_events; | |
33 | ||
12cbb469 | 34 | struct syslet_ring *ring; |
db6defc7 | 35 | unsigned int ring_mask; |
12cbb469 | 36 | void *stack; |
a4f4fdd7 JA |
37 | }; |
38 | ||
c6effc3e | 39 | static void fio_syslet_add_event(struct thread_data *td, struct io_u *io_u) |
9ff9de69 JA |
40 | { |
41 | struct syslet_data *sd = td->io_ops->data; | |
9ff9de69 | 42 | |
12cbb469 JA |
43 | assert(sd->nr_events < td->o.iodepth); |
44 | sd->events[sd->nr_events++] = io_u; | |
45 | } | |
9ff9de69 | 46 | |
c6effc3e | 47 | static void fio_syslet_add_events(struct thread_data *td, unsigned int nr) |
12cbb469 JA |
48 | { |
49 | struct syslet_data *sd = td->io_ops->data; | |
db6defc7 JA |
50 | unsigned int i, uidx; |
51 | ||
52 | uidx = sd->ring->user_tail; | |
53 | read_barrier(); | |
9ff9de69 | 54 | |
12cbb469 | 55 | for (i = 0; i < nr; i++) { |
db6defc7 | 56 | unsigned int idx = (i + uidx) & sd->ring_mask; |
12cbb469 JA |
57 | struct syslet_completion *comp = &sd->ring->comp[idx]; |
58 | struct io_u *io_u = (struct io_u *) (long) comp->caller_data; | |
c6effc3e JA |
59 | long ret; |
60 | ||
61 | ret = comp->status; | |
62 | if (ret <= 0) { | |
63 | io_u->resid = io_u->xfer_buflen; | |
64 | io_u->error = -ret; | |
65 | } else { | |
66 | io_u->resid = io_u->xfer_buflen - ret; | |
67 | io_u->error = 0; | |
68 | } | |
5b38ee84 | 69 | |
c6effc3e | 70 | fio_syslet_add_event(td, io_u); |
12cbb469 | 71 | } |
9ff9de69 JA |
72 | } |
73 | ||
12cbb469 | 74 | static void fio_syslet_wait_for_events(struct thread_data *td) |
a4f4fdd7 JA |
75 | { |
76 | struct syslet_data *sd = td->io_ops->data; | |
12cbb469 JA |
77 | struct syslet_ring *ring = sd->ring; |
78 | unsigned int events; | |
a4f4fdd7 | 79 | |
12cbb469 | 80 | events = 0; |
a4f4fdd7 | 81 | do { |
12cbb469 JA |
82 | unsigned int kh = ring->kernel_head; |
83 | int ret; | |
a4f4fdd7 | 84 | |
12cbb469 JA |
85 | /* |
86 | * first reap events that are already completed | |
87 | */ | |
88 | if (ring->user_tail != kh) { | |
89 | unsigned int nr = kh - ring->user_tail; | |
a4f4fdd7 | 90 | |
c6effc3e | 91 | fio_syslet_add_events(td, nr); |
12cbb469 JA |
92 | events += nr; |
93 | ring->user_tail = kh; | |
94 | continue; | |
95 | } | |
a4f4fdd7 | 96 | |
12cbb469 JA |
97 | /* |
98 | * block waiting for at least one event | |
99 | */ | |
100 | ret = syscall(__NR_syslet_ring_wait, ring, ring->user_tail); | |
101 | assert(!ret); | |
102 | } while (!events); | |
a4f4fdd7 JA |
103 | } |
104 | ||
105 | static int fio_syslet_getevents(struct thread_data *td, int min, | |
106 | int fio_unused max, | |
107 | struct timespec fio_unused *t) | |
108 | { | |
109 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
110 | long ret; |
111 | ||
112 | do { | |
a4f4fdd7 JA |
113 | /* |
114 | * do we have enough immediate completions? | |
115 | */ | |
116 | if (sd->nr_events >= (unsigned int) min) | |
117 | break; | |
118 | ||
12cbb469 | 119 | fio_syslet_wait_for_events(td); |
a4f4fdd7 JA |
120 | } while (1); |
121 | ||
122 | ret = sd->nr_events; | |
123 | sd->nr_events = 0; | |
124 | return ret; | |
125 | } | |
126 | ||
127 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
128 | { | |
129 | struct syslet_data *sd = td->io_ops->data; | |
130 | ||
131 | return sd->events[event]; | |
132 | } | |
133 | ||
12cbb469 JA |
134 | static void fio_syslet_prep_sync(struct fio_file *f, |
135 | struct indirect_registers *regs) | |
a4f4fdd7 | 136 | { |
12cbb469 | 137 | FILL_IN(*regs, __NR_fsync, (long) f->fd); |
a4f4fdd7 JA |
138 | } |
139 | ||
12cbb469 JA |
140 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f, |
141 | struct indirect_registers *regs) | |
a4f4fdd7 | 142 | { |
12cbb469 | 143 | long nr; |
a4f4fdd7 | 144 | |
a4f4fdd7 JA |
145 | /* |
146 | * prepare rw | |
147 | */ | |
148 | if (io_u->ddir == DDIR_READ) | |
1760e679 | 149 | nr = __NR_fio_pread; |
a4f4fdd7 | 150 | else |
1760e679 | 151 | nr = __NR_fio_pwrite; |
a4f4fdd7 | 152 | |
12cbb469 JA |
153 | FILL_IN(*regs, nr, (long) f->fd, (long) io_u->xfer_buf, |
154 | (long) io_u->xfer_buflen, (long) io_u->offset); | |
a4f4fdd7 JA |
155 | } |
156 | ||
12cbb469 | 157 | static void fio_syslet_prep(struct io_u *io_u, struct indirect_registers *regs) |
a4f4fdd7 JA |
158 | { |
159 | struct fio_file *f = io_u->file; | |
160 | ||
161 | if (io_u->ddir == DDIR_SYNC) | |
12cbb469 | 162 | fio_syslet_prep_sync(f, regs); |
a4f4fdd7 | 163 | else |
12cbb469 | 164 | fio_syslet_prep_rw(io_u, f, regs); |
a0a930ef JA |
165 | } |
166 | ||
12cbb469 | 167 | static void ret_func(void) |
a4f4fdd7 | 168 | { |
12cbb469 | 169 | syscall(__NR_exit); |
9ff9de69 JA |
170 | } |
171 | ||
172 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
173 | { | |
174 | struct syslet_data *sd = td->io_ops->data; | |
12cbb469 JA |
175 | union indirect_params params; |
176 | struct indirect_registers regs; | |
177 | int ret; | |
bf0dc8fa | 178 | |
7101d9c2 JA |
179 | fio_ro_check(td, io_u); |
180 | ||
12cbb469 JA |
181 | memset(¶ms, 0, sizeof(params)); |
182 | fill_syslet_args(¶ms.syslet, sd->ring, (long)io_u, ret_func, sd->stack); | |
a4f4fdd7 | 183 | |
12cbb469 | 184 | fio_syslet_prep(io_u, ®s); |
2ca50be4 | 185 | |
12cbb469 JA |
186 | ret = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); |
187 | if (ret == (int) io_u->xfer_buflen) { | |
188 | /* | |
189 | * completed sync, account. this also catches fsync(). | |
190 | */ | |
191 | return FIO_Q_COMPLETED; | |
192 | } else if (ret < 0) { | |
193 | /* | |
194 | * queued for async execution | |
195 | */ | |
196 | if (errno == ESYSLETPENDING) | |
197 | return FIO_Q_QUEUED; | |
198 | } | |
a4f4fdd7 | 199 | |
12cbb469 JA |
200 | io_u->error = errno; |
201 | td_verror(td, io_u->error, "xfer"); | |
202 | return FIO_Q_COMPLETED; | |
a4f4fdd7 JA |
203 | } |
204 | ||
76f58b92 JA |
205 | static int check_syslet_support(struct syslet_data *sd) |
206 | { | |
12cbb469 JA |
207 | union indirect_params params; |
208 | struct indirect_registers regs; | |
209 | pid_t pid, my_pid = getpid(); | |
76f58b92 | 210 | |
12cbb469 JA |
211 | memset(¶ms, 0, sizeof(params)); |
212 | fill_syslet_args(¶ms.syslet, sd->ring, 0, ret_func, sd->stack); | |
76f58b92 | 213 | |
12cbb469 JA |
214 | FILL_IN(regs, __NR_getpid); |
215 | ||
216 | pid = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); | |
217 | if (pid == my_pid) | |
218 | return 0; | |
219 | ||
220 | return 1; | |
76f58b92 JA |
221 | } |
222 | ||
a4f4fdd7 JA |
223 | static void fio_syslet_cleanup(struct thread_data *td) |
224 | { | |
225 | struct syslet_data *sd = td->io_ops->data; | |
226 | ||
227 | if (sd) { | |
a4f4fdd7 | 228 | free(sd->events); |
12cbb469 JA |
229 | free(sd->ring); |
230 | free(sd->stack); | |
a4f4fdd7 JA |
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; | |
e81f7340 | 239 | void *ring = NULL, *stack = NULL; |
05f6a172 | 240 | unsigned int ring_size, ring_nr; |
a4f4fdd7 JA |
241 | |
242 | sd = malloc(sizeof(*sd)); | |
243 | memset(sd, 0, sizeof(*sd)); | |
12cbb469 | 244 | |
2dc1bbeb JA |
245 | sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth); |
246 | memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth); | |
05f6a172 JA |
247 | |
248 | /* | |
249 | * The ring needs to be a power-of-2, so round it up if we have to | |
250 | */ | |
251 | ring_nr = td->o.iodepth; | |
252 | if (ring_nr & (ring_nr - 1)) { | |
253 | int bits = 1; | |
254 | ||
255 | while (ring_nr >>= 1) | |
256 | bits++; | |
257 | ||
258 | ring_nr = 1 << bits; | |
259 | } | |
260 | ||
261 | ring_size = sizeof(struct syslet_ring) + | |
262 | ring_nr * sizeof(struct syslet_completion); | |
263 | if (posix_memalign(&ring, sizeof(uint64_t), ring_size)) | |
e81f7340 | 264 | goto err_mem; |
12cbb469 | 265 | if (posix_memalign(&stack, page_size, page_size)) |
e81f7340 | 266 | goto err_mem; |
12cbb469 JA |
267 | |
268 | sd->ring = ring; | |
db6defc7 | 269 | sd->ring_mask = ring_nr - 1; |
12cbb469 JA |
270 | sd->stack = stack; |
271 | ||
05f6a172 JA |
272 | memset(sd->ring, 0, ring_size); |
273 | sd->ring->elements = ring_nr; | |
db64e9bc | 274 | |
e81f7340 JA |
275 | if (!check_syslet_support(sd)) { |
276 | td->io_ops->data = sd; | |
277 | return 0; | |
76f58b92 JA |
278 | } |
279 | ||
e81f7340 JA |
280 | log_err("fio: syslets do not appear to work\n"); |
281 | err_mem: | |
282 | free(sd->events); | |
283 | if (ring) | |
284 | free(ring); | |
285 | if (stack) | |
286 | free(stack); | |
287 | free(sd); | |
288 | return 1; | |
a4f4fdd7 JA |
289 | } |
290 | ||
291 | static struct ioengine_ops ioengine = { | |
292 | .name = "syslet-rw", | |
293 | .version = FIO_IOOPS_VERSION, | |
294 | .init = fio_syslet_init, | |
a4f4fdd7 JA |
295 | .queue = fio_syslet_queue, |
296 | .getevents = fio_syslet_getevents, | |
297 | .event = fio_syslet_event, | |
298 | .cleanup = fio_syslet_cleanup, | |
b5af8293 JA |
299 | .open_file = generic_open_file, |
300 | .close_file = generic_close_file, | |
a4f4fdd7 JA |
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 | } |