Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 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 | |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 20 | struct async_head_user *ahu; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 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, |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 95 | void *arg1, void *arg2, void *arg3, void *ret_ptr, |
| 96 | unsigned long flags, void *priv) |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 97 | { |
| 98 | atom->flags = flags; |
| 99 | atom->nr = nr; |
| 100 | atom->ret_ptr = ret_ptr; |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 101 | atom->next = NULL; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 102 | atom->arg_ptr[0] = arg0; |
| 103 | atom->arg_ptr[1] = arg1; |
| 104 | atom->arg_ptr[2] = arg2; |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 105 | atom->arg_ptr[3] = arg3; |
| 106 | atom->arg_ptr[4] = atom->arg_ptr[5] = NULL; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 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 | { |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 115 | init_atom(&io_u->req.atom, __NR_fsync, &f->fd, NULL, NULL, NULL, |
Jens Axboe | 7d44a74 | 2007-02-14 17:32:08 +0100 | [diff] [blame] | 116 | &io_u->req.ret, 0, io_u); |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 117 | } |
| 118 | |
| 119 | static void fio_syslet_prep_rw(struct io_u *io_u, struct fio_file *f) |
| 120 | { |
| 121 | int nr; |
| 122 | |
| 123 | /* |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 124 | * prepare rw |
| 125 | */ |
| 126 | if (io_u->ddir == DDIR_READ) |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 127 | nr = __NR_pread64; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 128 | else |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 129 | nr = __NR_pwrite64; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 130 | |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 131 | init_atom(&io_u->req.atom, nr, &f->fd, &io_u->xfer_buf, |
Jens Axboe | 7d44a74 | 2007-02-14 17:32:08 +0100 | [diff] [blame] | 132 | &io_u->xfer_buflen, &io_u->offset, &io_u->req.ret, 0, io_u); |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 133 | } |
| 134 | |
| 135 | static int fio_syslet_prep(struct thread_data fio_unused *td, struct io_u *io_u) |
| 136 | { |
| 137 | struct fio_file *f = io_u->file; |
| 138 | |
| 139 | if (io_u->ddir == DDIR_SYNC) |
| 140 | fio_syslet_prep_sync(io_u, f); |
| 141 | else |
| 142 | fio_syslet_prep_rw(io_u, f); |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | |
| 147 | static int fio_syslet_queue(struct thread_data *td, struct io_u *io_u) |
| 148 | { |
| 149 | struct syslet_data *sd = td->io_ops->data; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 150 | long ret; |
| 151 | |
Jens Axboe | 7d44a74 | 2007-02-14 17:32:08 +0100 | [diff] [blame] | 152 | /* |
| 153 | * On sync completion, the atom is returned. So on NULL return |
| 154 | * it's queued asynchronously. |
| 155 | */ |
| 156 | if (!async_exec(&io_u->req.atom)) |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame^] | 157 | return FIO_Q_QUEUED; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 158 | |
| 159 | /* |
| 160 | * completed sync |
| 161 | */ |
Jens Axboe | a2e1b08 | 2007-02-14 08:06:19 +0100 | [diff] [blame] | 162 | ret = io_u->req.ret; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 163 | if (ret != (long) io_u->xfer_buflen) { |
| 164 | if (ret > 0) { |
| 165 | io_u->resid = io_u->xfer_buflen - ret; |
| 166 | io_u->error = 0; |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame^] | 167 | return FIO_Q_COMPLETED; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 168 | } else |
| 169 | io_u->error = errno; |
| 170 | } |
| 171 | |
| 172 | if (!io_u->error) |
| 173 | sd->events[sd->nr_events++] = io_u; |
| 174 | else |
| 175 | td_verror(td, io_u->error); |
| 176 | |
Jens Axboe | 36167d8 | 2007-02-18 05:41:31 +0100 | [diff] [blame^] | 177 | return FIO_Q_COMPLETED; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 178 | } |
| 179 | |
Jens Axboe | db64e9b | 2007-02-14 02:10:59 +0100 | [diff] [blame] | 180 | static int async_head_init(struct syslet_data *sd, unsigned int depth) |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 181 | { |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 182 | unsigned long ring_size; |
| 183 | |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 184 | sd->ahu = malloc(sizeof(struct async_head_user)); |
| 185 | memset(sd->ahu, 0, sizeof(struct async_head_user)); |
| 186 | |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 187 | ring_size = sizeof(struct syslet_uatom *) * depth; |
| 188 | sd->ring = malloc(ring_size); |
| 189 | memset(sd->ring, 0, ring_size); |
| 190 | |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 191 | sd->ahu->completion_ring = sd->ring; |
| 192 | sd->ahu->ring_size_bytes = ring_size; |
| 193 | sd->ahu->max_nr_threads = -1; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 194 | |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 195 | if (async_register(sd->ahu, sizeof(*sd->ahu)) < 0) { |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 196 | perror("async_register"); |
Jens Axboe | db64e9b | 2007-02-14 02:10:59 +0100 | [diff] [blame] | 197 | fprintf(stderr, "fio: syslet likely not supported\n"); |
| 198 | free(sd->ring); |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 199 | free(sd->ahu); |
Jens Axboe | db64e9b | 2007-02-14 02:10:59 +0100 | [diff] [blame] | 200 | return 1; |
| 201 | } |
| 202 | |
| 203 | return 0; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 204 | } |
| 205 | |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 206 | static void async_head_exit(struct syslet_data *sd) |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 207 | { |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 208 | if (async_unregister(sd->ahu, sizeof(*sd->ahu)) < 0) |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 209 | perror("async_register"); |
Jens Axboe | 7f059a7 | 2007-02-14 08:53:11 +0100 | [diff] [blame] | 210 | |
| 211 | free(sd->ahu); |
| 212 | free(sd->ring); |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | static void fio_syslet_cleanup(struct thread_data *td) |
| 216 | { |
| 217 | struct syslet_data *sd = td->io_ops->data; |
| 218 | |
| 219 | if (sd) { |
Jens Axboe | 2ca50be | 2007-02-14 08:31:15 +0100 | [diff] [blame] | 220 | async_head_exit(sd); |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 221 | free(sd->events); |
| 222 | free(sd); |
| 223 | td->io_ops->data = NULL; |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | static int fio_syslet_init(struct thread_data *td) |
| 228 | { |
| 229 | struct syslet_data *sd; |
| 230 | |
Jens Axboe | db64e9b | 2007-02-14 02:10:59 +0100 | [diff] [blame] | 231 | |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 232 | sd = malloc(sizeof(*sd)); |
| 233 | memset(sd, 0, sizeof(*sd)); |
| 234 | sd->events = malloc(sizeof(struct io_u *) * td->iodepth); |
| 235 | memset(sd->events, 0, sizeof(struct io_u *) * td->iodepth); |
Jens Axboe | db64e9b | 2007-02-14 02:10:59 +0100 | [diff] [blame] | 236 | |
| 237 | /* |
| 238 | * This will handily fail for kernels where syslet isn't available |
| 239 | */ |
| 240 | if (async_head_init(sd, td->iodepth)) { |
| 241 | free(sd->events); |
| 242 | free(sd); |
| 243 | return 1; |
| 244 | } |
| 245 | |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 246 | td->io_ops->data = sd; |
Jens Axboe | a4f4fdd | 2007-02-14 01:16:39 +0100 | [diff] [blame] | 247 | return 0; |
| 248 | } |
| 249 | |
| 250 | static struct ioengine_ops ioengine = { |
| 251 | .name = "syslet-rw", |
| 252 | .version = FIO_IOOPS_VERSION, |
| 253 | .init = fio_syslet_init, |
| 254 | .prep = fio_syslet_prep, |
| 255 | .queue = fio_syslet_queue, |
| 256 | .getevents = fio_syslet_getevents, |
| 257 | .event = fio_syslet_event, |
| 258 | .cleanup = fio_syslet_cleanup, |
| 259 | }; |
| 260 | |
| 261 | #else /* FIO_HAVE_SYSLET */ |
| 262 | |
| 263 | /* |
| 264 | * When we have a proper configure system in place, we simply wont build |
| 265 | * and install this io engine. For now install a crippled version that |
| 266 | * just complains and fails to load. |
| 267 | */ |
| 268 | static int fio_syslet_init(struct thread_data fio_unused *td) |
| 269 | { |
| 270 | fprintf(stderr, "fio: syslet not available\n"); |
| 271 | return 1; |
| 272 | } |
| 273 | |
| 274 | static struct ioengine_ops ioengine = { |
| 275 | .name = "syslet-rw", |
| 276 | .version = FIO_IOOPS_VERSION, |
| 277 | .init = fio_syslet_init, |
| 278 | }; |
| 279 | |
| 280 | #endif /* FIO_HAVE_SYSLET */ |
| 281 | |
| 282 | static void fio_init fio_syslet_register(void) |
| 283 | { |
| 284 | register_ioengine(&ioengine); |
| 285 | } |
| 286 | |
| 287 | static void fio_exit fio_syslet_unregister(void) |
| 288 | { |
| 289 | unregister_ioengine(&ioengine); |
| 290 | } |