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 | 77 | struct syslet_ring *ring = sd->ring; |
a4f4fdd7 JA |
78 | |
79 | do { | |
12cbb469 JA |
80 | unsigned int kh = ring->kernel_head; |
81 | int ret; | |
a4f4fdd7 | 82 | |
12cbb469 JA |
83 | /* |
84 | * first reap events that are already completed | |
85 | */ | |
86 | if (ring->user_tail != kh) { | |
87 | unsigned int nr = kh - ring->user_tail; | |
a4f4fdd7 | 88 | |
c6effc3e | 89 | fio_syslet_add_events(td, nr); |
12cbb469 | 90 | ring->user_tail = kh; |
4a88edf7 | 91 | break; |
12cbb469 | 92 | } |
a4f4fdd7 | 93 | |
12cbb469 JA |
94 | /* |
95 | * block waiting for at least one event | |
96 | */ | |
97 | ret = syscall(__NR_syslet_ring_wait, ring, ring->user_tail); | |
98 | assert(!ret); | |
4a88edf7 | 99 | } while (1); |
a4f4fdd7 JA |
100 | } |
101 | ||
e7d2e616 JA |
102 | static int fio_syslet_getevents(struct thread_data *td, unsigned int min, |
103 | unsigned int fio_unused max, | |
a4f4fdd7 JA |
104 | struct timespec fio_unused *t) |
105 | { | |
106 | struct syslet_data *sd = td->io_ops->data; | |
a4f4fdd7 JA |
107 | long ret; |
108 | ||
4a88edf7 JA |
109 | /* |
110 | * While we have less events than requested, block waiting for them | |
a3cc770d JA |
111 | * (if we have to, there may already be more completed events ready |
112 | * for us - see fio_syslet_wait_for_events() | |
4a88edf7 | 113 | */ |
a3cc770d | 114 | while (sd->nr_events < min) |
12cbb469 | 115 | fio_syslet_wait_for_events(td); |
a4f4fdd7 JA |
116 | |
117 | ret = sd->nr_events; | |
118 | sd->nr_events = 0; | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static struct io_u *fio_syslet_event(struct thread_data *td, int event) | |
123 | { | |
124 | struct syslet_data *sd = td->io_ops->data; | |
125 | ||
126 | return sd->events[event]; | |
127 | } | |
128 | ||
12cbb469 JA |
129 | static void fio_syslet_prep_sync(struct fio_file *f, |
130 | struct indirect_registers *regs) | |
a4f4fdd7 | 131 | { |
12cbb469 | 132 | FILL_IN(*regs, __NR_fsync, (long) f->fd); |
a4f4fdd7 JA |
133 | } |
134 | ||
12cbb469 JA |
135 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f, |
136 | struct indirect_registers *regs) | |
a4f4fdd7 | 137 | { |
12cbb469 | 138 | long nr; |
a4f4fdd7 | 139 | |
a4f4fdd7 JA |
140 | /* |
141 | * prepare rw | |
142 | */ | |
143 | if (io_u->ddir == DDIR_READ) | |
1760e679 | 144 | nr = __NR_fio_pread; |
a4f4fdd7 | 145 | else |
1760e679 | 146 | nr = __NR_fio_pwrite; |
a4f4fdd7 | 147 | |
12cbb469 JA |
148 | FILL_IN(*regs, nr, (long) f->fd, (long) io_u->xfer_buf, |
149 | (long) io_u->xfer_buflen, (long) io_u->offset); | |
a4f4fdd7 JA |
150 | } |
151 | ||
12cbb469 | 152 | static void fio_syslet_prep(struct io_u *io_u, struct indirect_registers *regs) |
a4f4fdd7 JA |
153 | { |
154 | struct fio_file *f = io_u->file; | |
155 | ||
156 | if (io_u->ddir == DDIR_SYNC) | |
12cbb469 | 157 | fio_syslet_prep_sync(f, regs); |
a4f4fdd7 | 158 | else |
12cbb469 | 159 | fio_syslet_prep_rw(io_u, f, regs); |
a0a930ef JA |
160 | } |
161 | ||
12cbb469 | 162 | static void ret_func(void) |
a4f4fdd7 | 163 | { |
12cbb469 | 164 | syscall(__NR_exit); |
9ff9de69 JA |
165 | } |
166 | ||
167 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) | |
168 | { | |
169 | struct syslet_data *sd = td->io_ops->data; | |
12cbb469 JA |
170 | union indirect_params params; |
171 | struct indirect_registers regs; | |
172 | int ret; | |
bf0dc8fa | 173 | |
7101d9c2 JA |
174 | fio_ro_check(td, io_u); |
175 | ||
12cbb469 JA |
176 | memset(¶ms, 0, sizeof(params)); |
177 | fill_syslet_args(¶ms.syslet, sd->ring, (long)io_u, ret_func, sd->stack); | |
a4f4fdd7 | 178 | |
12cbb469 | 179 | fio_syslet_prep(io_u, ®s); |
2ca50be4 | 180 | |
12cbb469 JA |
181 | ret = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); |
182 | if (ret == (int) io_u->xfer_buflen) { | |
183 | /* | |
184 | * completed sync, account. this also catches fsync(). | |
185 | */ | |
186 | return FIO_Q_COMPLETED; | |
187 | } else if (ret < 0) { | |
188 | /* | |
189 | * queued for async execution | |
190 | */ | |
191 | if (errno == ESYSLETPENDING) | |
192 | return FIO_Q_QUEUED; | |
193 | } | |
a4f4fdd7 | 194 | |
12cbb469 JA |
195 | io_u->error = errno; |
196 | td_verror(td, io_u->error, "xfer"); | |
197 | return FIO_Q_COMPLETED; | |
a4f4fdd7 JA |
198 | } |
199 | ||
76f58b92 JA |
200 | static int check_syslet_support(struct syslet_data *sd) |
201 | { | |
12cbb469 JA |
202 | union indirect_params params; |
203 | struct indirect_registers regs; | |
204 | pid_t pid, my_pid = getpid(); | |
76f58b92 | 205 | |
12cbb469 JA |
206 | memset(¶ms, 0, sizeof(params)); |
207 | fill_syslet_args(¶ms.syslet, sd->ring, 0, ret_func, sd->stack); | |
76f58b92 | 208 | |
12cbb469 JA |
209 | FILL_IN(regs, __NR_getpid); |
210 | ||
211 | pid = syscall(__NR_indirect, ®s, ¶ms, sizeof(params), 0); | |
212 | if (pid == my_pid) | |
213 | return 0; | |
214 | ||
215 | return 1; | |
76f58b92 JA |
216 | } |
217 | ||
a4f4fdd7 JA |
218 | static void fio_syslet_cleanup(struct thread_data *td) |
219 | { | |
220 | struct syslet_data *sd = td->io_ops->data; | |
221 | ||
222 | if (sd) { | |
a4f4fdd7 | 223 | free(sd->events); |
12cbb469 | 224 | free(sd->ring); |
a4f4fdd7 JA |
225 | free(sd); |
226 | td->io_ops->data = NULL; | |
227 | } | |
228 | } | |
229 | ||
230 | static int fio_syslet_init(struct thread_data *td) | |
231 | { | |
232 | struct syslet_data *sd; | |
e81f7340 | 233 | void *ring = NULL, *stack = NULL; |
05f6a172 | 234 | unsigned int ring_size, ring_nr; |
a4f4fdd7 JA |
235 | |
236 | sd = malloc(sizeof(*sd)); | |
237 | memset(sd, 0, sizeof(*sd)); | |
12cbb469 | 238 | |
2dc1bbeb JA |
239 | sd->events = malloc(sizeof(struct io_u *) * td->o.iodepth); |
240 | memset(sd->events, 0, sizeof(struct io_u *) * td->o.iodepth); | |
05f6a172 JA |
241 | |
242 | /* | |
243 | * The ring needs to be a power-of-2, so round it up if we have to | |
244 | */ | |
245 | ring_nr = td->o.iodepth; | |
246 | if (ring_nr & (ring_nr - 1)) { | |
247 | int bits = 1; | |
248 | ||
249 | while (ring_nr >>= 1) | |
250 | bits++; | |
251 | ||
252 | ring_nr = 1 << bits; | |
253 | } | |
254 | ||
255 | ring_size = sizeof(struct syslet_ring) + | |
256 | ring_nr * sizeof(struct syslet_completion); | |
257 | if (posix_memalign(&ring, sizeof(uint64_t), ring_size)) | |
e81f7340 | 258 | goto err_mem; |
12cbb469 | 259 | if (posix_memalign(&stack, page_size, page_size)) |
e81f7340 | 260 | goto err_mem; |
12cbb469 JA |
261 | |
262 | sd->ring = ring; | |
db6defc7 | 263 | sd->ring_mask = ring_nr - 1; |
12cbb469 JA |
264 | sd->stack = stack; |
265 | ||
05f6a172 JA |
266 | memset(sd->ring, 0, ring_size); |
267 | sd->ring->elements = ring_nr; | |
db64e9bc | 268 | |
e81f7340 JA |
269 | if (!check_syslet_support(sd)) { |
270 | td->io_ops->data = sd; | |
271 | return 0; | |
76f58b92 JA |
272 | } |
273 | ||
e81f7340 JA |
274 | log_err("fio: syslets do not appear to work\n"); |
275 | err_mem: | |
276 | free(sd->events); | |
277 | if (ring) | |
278 | free(ring); | |
279 | if (stack) | |
280 | free(stack); | |
281 | free(sd); | |
282 | return 1; | |
a4f4fdd7 JA |
283 | } |
284 | ||
285 | static struct ioengine_ops ioengine = { | |
286 | .name = "syslet-rw", | |
287 | .version = FIO_IOOPS_VERSION, | |
288 | .init = fio_syslet_init, | |
a4f4fdd7 JA |
289 | .queue = fio_syslet_queue, |
290 | .getevents = fio_syslet_getevents, | |
291 | .event = fio_syslet_event, | |
292 | .cleanup = fio_syslet_cleanup, | |
b5af8293 JA |
293 | .open_file = generic_open_file, |
294 | .close_file = generic_close_file, | |
a4f4fdd7 JA |
295 | }; |
296 | ||
297 | #else /* FIO_HAVE_SYSLET */ | |
298 | ||
299 | /* | |
300 | * When we have a proper configure system in place, we simply wont build | |
301 | * and install this io engine. For now install a crippled version that | |
302 | * just complains and fails to load. | |
303 | */ | |
304 | static int fio_syslet_init(struct thread_data fio_unused *td) | |
305 | { | |
306 | fprintf(stderr, "fio: syslet not available\n"); | |
307 | return 1; | |
308 | } | |
309 | ||
310 | static struct ioengine_ops ioengine = { | |
311 | .name = "syslet-rw", | |
312 | .version = FIO_IOOPS_VERSION, | |
313 | .init = fio_syslet_init, | |
314 | }; | |
315 | ||
316 | #endif /* FIO_HAVE_SYSLET */ | |
317 | ||
318 | static void fio_init fio_syslet_register(void) | |
319 | { | |
320 | register_ioengine(&ioengine); | |
321 | } | |
322 | ||
323 | static void fio_exit fio_syslet_unregister(void) | |
324 | { | |
325 | unregister_ioengine(&ioengine); | |
326 | } |