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" | |
e6026f9c | 19 | #include "../fls.h" |
a4f4fdd7 JA |
20 | |
21 | #ifdef FIO_HAVE_SYSLET | |
22 | ||
1760e679 JA |
23 | #ifdef __NR_pread64 |
24 | #define __NR_fio_pread __NR_pread64 | |
25 | #define __NR_fio_pwrite __NR_pwrite64 | |
26 | #else | |
27 | #define __NR_fio_pread __NR_pread | |
28 | #define __NR_fio_pwrite __NR_pwrite | |
29 | #endif | |
30 | ||
a4f4fdd7 JA |
31 | struct syslet_data { |
32 | struct io_u **events; | |
33 | unsigned int nr_events; | |
34 | ||
12cbb469 | 35 | struct syslet_ring *ring; |
db6defc7 | 36 | unsigned int ring_mask; |
12cbb469 | 37 | void *stack; |
a4f4fdd7 JA |
38 | }; |
39 | ||
c6effc3e | 40 | static void fio_syslet_add_event(struct thread_data *td, struct io_u *io_u) |
9ff9de69 JA |
41 | { |
42 | struct syslet_data *sd = td->io_ops->data; | |
9ff9de69 | 43 | |
12cbb469 JA |
44 | assert(sd->nr_events < td->o.iodepth); |
45 | sd->events[sd->nr_events++] = io_u; | |
46 | } | |
9ff9de69 | 47 | |
c6effc3e | 48 | static void fio_syslet_add_events(struct thread_data *td, unsigned int nr) |
12cbb469 JA |
49 | { |
50 | struct syslet_data *sd = td->io_ops->data; | |
db6defc7 JA |
51 | unsigned int i, uidx; |
52 | ||
53 | uidx = sd->ring->user_tail; | |
54 | read_barrier(); | |
9ff9de69 | 55 | |
12cbb469 | 56 | for (i = 0; i < nr; i++) { |
db6defc7 | 57 | unsigned int idx = (i + uidx) & sd->ring_mask; |
12cbb469 JA |
58 | struct syslet_completion *comp = &sd->ring->comp[idx]; |
59 | struct io_u *io_u = (struct io_u *) (long) comp->caller_data; | |
c6effc3e JA |
60 | long ret; |
61 | ||
62 | ret = comp->status; | |
63 | if (ret <= 0) { | |
64 | io_u->resid = io_u->xfer_buflen; | |
65 | io_u->error = -ret; | |
66 | } else { | |
67 | io_u->resid = io_u->xfer_buflen - ret; | |
68 | io_u->error = 0; | |
69 | } | |
5b38ee84 | 70 | |
c6effc3e | 71 | fio_syslet_add_event(td, io_u); |
12cbb469 | 72 | } |
9ff9de69 JA |
73 | } |
74 | ||
12cbb469 | 75 | static void fio_syslet_wait_for_events(struct thread_data *td) |
a4f4fdd7 JA |
76 | { |
77 | struct syslet_data *sd = td->io_ops->data; | |
12cbb469 | 78 | struct syslet_ring *ring = sd->ring; |
a4f4fdd7 JA |
79 | |
80 | do { | |
12cbb469 JA |
81 | unsigned int kh = ring->kernel_head; |
82 | int ret; | |
a4f4fdd7 | 83 | |
12cbb469 JA |
84 | /* |
85 | * first reap events that are already completed | |
86 | */ | |
87 | if (ring->user_tail != kh) { | |
88 | unsigned int nr = kh - ring->user_tail; | |
a4f4fdd7 | 89 | |
c6effc3e | 90 | fio_syslet_add_events(td, nr); |
12cbb469 | 91 | ring->user_tail = kh; |
4a88edf7 | 92 | break; |
12cbb469 | 93 | } |
a4f4fdd7 | 94 | |
12cbb469 JA |
95 | /* |
96 | * block waiting for at least one event | |
97 | */ | |
98 | ret = syscall(__NR_syslet_ring_wait, ring, ring->user_tail); | |
99 | assert(!ret); | |
4a88edf7 | 100 | } while (1); |
a4f4fdd7 JA |
101 | } |
102 | ||
e7d2e616 JA |
103 | static int fio_syslet_getevents(struct thread_data *td, unsigned int min, |
104 | unsigned int fio_unused max, | |
a4f4fdd7 JA |
105 | struct timespec fio_unused *t) |
106 | { | |
107 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
108 | long ret; |
109 | ||
4a88edf7 JA |
110 | /* |
111 | * While we have less events than requested, block waiting for them | |
a3cc770d JA |
112 | * (if we have to, there may already be more completed events ready |
113 | * for us - see fio_syslet_wait_for_events() | |
4a88edf7 | 114 | */ |
a3cc770d | 115 | while (sd->nr_events < min) |
12cbb469 | 116 | fio_syslet_wait_for_events(td); |
a4f4fdd7 JA |
117 | |
118 | ret = sd->nr_events; | |
119 | sd->nr_events = 0; | |
120 | return ret; | |
121 | } | |
122 | ||
123 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
124 | { | |
125 | struct syslet_data *sd = td->io_ops->data; | |
126 | ||
127 | return sd->events[event]; | |
128 | } | |
129 | ||
12cbb469 JA |
130 | static void fio_syslet_prep_sync(struct fio_file *f, |
131 | struct indirect_registers *regs) | |
a4f4fdd7 | 132 | { |
12cbb469 | 133 | FILL_IN(*regs, __NR_fsync, (long) f->fd); |
a4f4fdd7 JA |
134 | } |
135 | ||
12cbb469 JA |
136 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f, |
137 | struct indirect_registers *regs) | |
a4f4fdd7 | 138 | { |
12cbb469 | 139 | long nr; |
a4f4fdd7 | 140 | |
a4f4fdd7 JA |
141 | /* |
142 | * prepare rw | |
143 | */ | |
144 | if (io_u->ddir == DDIR_READ) | |
1760e679 | 145 | nr = __NR_fio_pread; |
a4f4fdd7 | 146 | else |
1760e679 | 147 | nr = __NR_fio_pwrite; |
a4f4fdd7 | 148 | |
12cbb469 JA |
149 | FILL_IN(*regs, nr, (long) f->fd, (long) io_u->xfer_buf, |
150 | (long) io_u->xfer_buflen, (long) io_u->offset); | |
a4f4fdd7 JA |
151 | } |
152 | ||
12cbb469 | 153 | static void fio_syslet_prep(struct io_u *io_u, struct indirect_registers *regs) |
a4f4fdd7 JA |
154 | { |
155 | struct fio_file *f = io_u->file; | |
156 | ||
157 | if (io_u->ddir == DDIR_SYNC) | |
12cbb469 | 158 | fio_syslet_prep_sync(f, regs); |
a4f4fdd7 | 159 | else |
12cbb469 | 160 | fio_syslet_prep_rw(io_u, f, regs); |
a0a930ef JA |
161 | } |
162 | ||
12cbb469 | 163 | static void ret_func(void) |
a4f4fdd7 | 164 | { |
12cbb469 | 165 | syscall(__NR_exit); |
9ff9de69 JA |
166 | } |
167 | ||
168 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
169 | { | |
170 | struct syslet_data *sd = td->io_ops->data; | |
12cbb469 JA |
171 | union indirect_params params; |
172 | struct indirect_registers regs; | |
173 | int ret; | |
bf0dc8fa | 174 | |
7101d9c2 JA |
175 | fio_ro_check(td, io_u); |
176 | ||
12cbb469 JA |
177 | memset(¶ms, 0, sizeof(params)); |
178 | fill_syslet_args(¶ms.syslet, sd->ring, (long)io_u, ret_func, sd->stack); | |
a4f4fdd7 | 179 | |
12cbb469 | 180 | fio_syslet_prep(io_u, ®s); |
2ca50be4 | 181 | |
12cbb469 JA |
182 | ret = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); |
183 | if (ret == (int) io_u->xfer_buflen) { | |
184 | /* | |
185 | * completed sync, account. this also catches fsync(). | |
186 | */ | |
187 | return FIO_Q_COMPLETED; | |
188 | } else if (ret < 0) { | |
189 | /* | |
190 | * queued for async execution | |
191 | */ | |
192 | if (errno == ESYSLETPENDING) | |
193 | return FIO_Q_QUEUED; | |
194 | } | |
a4f4fdd7 | 195 | |
12cbb469 JA |
196 | io_u->error = errno; |
197 | td_verror(td, io_u->error, "xfer"); | |
198 | return FIO_Q_COMPLETED; | |
a4f4fdd7 JA |
199 | } |
200 | ||
76f58b92 JA |
201 | static int check_syslet_support(struct syslet_data *sd) |
202 | { | |
12cbb469 JA |
203 | union indirect_params params; |
204 | struct indirect_registers regs; | |
205 | pid_t pid, my_pid = getpid(); | |
76f58b92 | 206 | |
12cbb469 JA |
207 | memset(¶ms, 0, sizeof(params)); |
208 | fill_syslet_args(¶ms.syslet, sd->ring, 0, ret_func, sd->stack); | |
76f58b92 | 209 | |
12cbb469 JA |
210 | FILL_IN(regs, __NR_getpid); |
211 | ||
212 | pid = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); | |
213 | if (pid == my_pid) | |
214 | return 0; | |
215 | ||
216 | return 1; | |
76f58b92 JA |
217 | } |
218 | ||
a4f4fdd7 JA |
219 | static void fio_syslet_cleanup(struct thread_data *td) |
220 | { | |
221 | struct syslet_data *sd = td->io_ops->data; | |
222 | ||
223 | if (sd) { | |
a4f4fdd7 | 224 | free(sd->events); |
12cbb469 | 225 | free(sd->ring); |
a4f4fdd7 JA |
226 | free(sd); |
227 | td->io_ops->data = NULL; | |
228 | } | |
229 | } | |
230 | ||
231 | static int fio_syslet_init(struct thread_data *td) | |
232 | { | |
233 | struct syslet_data *sd; | |
e81f7340 | 234 | void *ring = NULL, *stack = NULL; |
05f6a172 | 235 | unsigned int ring_size, ring_nr; |
a4f4fdd7 JA |
236 | |
237 | sd = malloc(sizeof(*sd)); | |
238 | memset(sd, 0, sizeof(*sd)); | |
12cbb469 | 239 | |
2dc1bbeb JA |
240 | sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth); |
241 | memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth); | |
05f6a172 JA |
242 | |
243 | /* | |
244 | * The ring needs to be a power-of-2, so round it up if we have to | |
245 | */ | |
246 | ring_nr = td->o.iodepth; | |
e6026f9c JA |
247 | if (ring_nr & (ring_nr - 1)) |
248 | ring_nr = 1 << fls(ring_nr); | |
05f6a172 JA |
249 | |
250 | ring_size = sizeof(struct syslet_ring) + | |
251 | ring_nr * sizeof(struct syslet_completion); | |
252 | if (posix_memalign(&ring, sizeof(uint64_t), ring_size)) | |
e81f7340 | 253 | goto err_mem; |
12cbb469 | 254 | if (posix_memalign(&stack, page_size, page_size)) |
e81f7340 | 255 | goto err_mem; |
12cbb469 JA |
256 | |
257 | sd->ring = ring; | |
db6defc7 | 258 | sd->ring_mask = ring_nr - 1; |
12cbb469 JA |
259 | sd->stack = stack; |
260 | ||
05f6a172 JA |
261 | memset(sd->ring, 0, ring_size); |
262 | sd->ring->elements = ring_nr; | |
db64e9bc | 263 | |
e81f7340 JA |
264 | if (!check_syslet_support(sd)) { |
265 | td->io_ops->data = sd; | |
266 | return 0; | |
76f58b92 JA |
267 | } |
268 | ||
e81f7340 JA |
269 | log_err("fio: syslets do not appear to work\n"); |
270 | err_mem: | |
271 | free(sd->events); | |
272 | if (ring) | |
273 | free(ring); | |
274 | if (stack) | |
275 | free(stack); | |
276 | free(sd); | |
277 | return 1; | |
a4f4fdd7 JA |
278 | } |
279 | ||
280 | static struct ioengine_ops ioengine = { | |
281 | .name = "syslet-rw", | |
282 | .version = FIO_IOOPS_VERSION, | |
283 | .init = fio_syslet_init, | |
a4f4fdd7 JA |
284 | .queue = fio_syslet_queue, |
285 | .getevents = fio_syslet_getevents, | |
286 | .event = fio_syslet_event, | |
287 | .cleanup = fio_syslet_cleanup, | |
b5af8293 JA |
288 | .open_file = generic_open_file, |
289 | .close_file = generic_close_file, | |
a4f4fdd7 JA |
290 | }; |
291 | ||
292 | #else /* FIO_HAVE_SYSLET */ | |
293 | ||
294 | /* | |
295 | * When we have a proper configure system in place, we simply wont build | |
296 | * and install this io engine. For now install a crippled version that | |
297 | * just complains and fails to load. | |
298 | */ | |
299 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
300 | { | |
301 | fprintf(stderr, "fio: syslet not available\n"); | |
302 | return 1; | |
303 | } | |
304 | ||
305 | static struct ioengine_ops ioengine = { | |
306 | .name = "syslet-rw", | |
307 | .version = FIO_IOOPS_VERSION, | |
308 | .init = fio_syslet_init, | |
309 | }; | |
310 | ||
311 | #endif /* FIO_HAVE_SYSLET */ | |
312 | ||
313 | static void fio_init fio_syslet_register(void) | |
314 | { | |
315 | register_ioengine(&ioengine); | |
316 | } | |
317 | ||
318 | static void fio_exit fio_syslet_unregister(void) | |
319 | { | |
320 | unregister_ioengine(&ioengine); | |
321 | } |