4 * IO engine that uses the Linux SG v3 interface to talk to SCSI devices
19 unsigned char cdb[10];
24 struct sgio_cmd *cmds;
33 static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
34 struct io_u *io_u, int fs)
36 struct sgio_cmd *sc = &sd->cmds[io_u->index];
38 memset(hdr, 0, sizeof(*hdr));
39 memset(sc->cdb, 0, sizeof(sc->cdb));
41 hdr->interface_id = 'S';
43 hdr->cmd_len = sizeof(sc->cdb);
44 hdr->pack_id = io_u->index;
48 hdr->dxferp = io_u->xfer_buf;
49 hdr->dxfer_len = io_u->xfer_buflen;
53 static int pollin_events(struct pollfd *pfds, int fds)
57 for (i = 0; i < fds; i++)
58 if (pfds[i].revents & POLLIN)
64 static int fio_sgio_getevents(struct thread_data *td, unsigned int min,
65 unsigned int max, struct timespec fio_unused *t)
67 struct sgio_data *sd = td->io_ops->data;
68 int left = max, ret, r = 0;
69 void *buf = sd->sgbuf;
70 unsigned int i, events;
74 * Fill in the file descriptors
76 for_each_file(td, f, i) {
78 * don't block for min events == 0
81 fio_set_fd_nonblocking(f->fd, "sg");
83 sd->pfds[i].fd = f->fd;
84 sd->pfds[i].events = POLLIN;
94 ret = poll(sd->pfds, td->o.nr_files, -1);
98 td_verror(td, errno, "poll");
103 if (pollin_events(sd->pfds, td->o.nr_files))
113 for_each_file(td, f, i) {
114 ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
119 td_verror(td, errno, "read");
123 events += ret / sizeof(struct sg_io_hdr);
137 for (i = 0; i < events; i++) {
138 struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i;
140 sd->events[i] = hdr->usr_ptr;
145 for_each_file(td, f, i) {
146 if (fcntl(f->fd, F_SETFL, sd->fd_flags[i]) < 0)
147 log_err("fio: sg failed to restore fcntl flags: %s\n", strerror(errno));
154 static int fio_sgio_ioctl_doio(struct thread_data *td,
155 struct fio_file *f, struct io_u *io_u)
157 struct sgio_data *sd = td->io_ops->data;
158 struct sg_io_hdr *hdr = &io_u->hdr;
161 sd->events[0] = io_u;
163 ret = ioctl(f->fd, SG_IO, hdr);
167 return FIO_Q_COMPLETED;
170 static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int do_sync)
172 struct sg_io_hdr *hdr = &io_u->hdr;
175 ret = write(f->fd, hdr, sizeof(*hdr));
180 ret = read(f->fd, hdr, sizeof(*hdr));
183 return FIO_Q_COMPLETED;
189 static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int do_sync)
191 struct fio_file *f = io_u->file;
193 if (f->filetype == FIO_TYPE_BD)
194 return fio_sgio_ioctl_doio(td, f, io_u);
196 return fio_sgio_rw_doio(f, io_u, do_sync);
199 static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u)
201 struct sg_io_hdr *hdr = &io_u->hdr;
202 struct sgio_data *sd = td->io_ops->data;
205 if (io_u->xfer_buflen & (sd->bs - 1)) {
206 log_err("read/write not sector aligned\n");
210 if (io_u->ddir == DDIR_READ) {
211 sgio_hdr_init(sd, hdr, io_u, 1);
213 hdr->dxfer_direction = SG_DXFER_FROM_DEV;
215 } else if (io_u->ddir == DDIR_WRITE) {
216 sgio_hdr_init(sd, hdr, io_u, 1);
218 hdr->dxfer_direction = SG_DXFER_TO_DEV;
221 sgio_hdr_init(sd, hdr, io_u, 0);
223 hdr->dxfer_direction = SG_DXFER_NONE;
227 if (hdr->dxfer_direction != SG_DXFER_NONE) {
228 nr_blocks = io_u->xfer_buflen / sd->bs;
229 lba = io_u->offset / sd->bs;
230 hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
231 hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
232 hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff);
233 hdr->cmdp[5] = (unsigned char) (lba & 0xff);
234 hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff);
235 hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff);
241 static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u)
243 struct sg_io_hdr *hdr = &io_u->hdr;
244 int ret, do_sync = 0;
246 fio_ro_check(td, io_u);
248 if (td->o.sync_io || td->o.odirect || ddir_sync(io_u->ddir))
251 ret = fio_sgio_doio(td, io_u, do_sync);
255 else if (hdr->status) {
256 io_u->resid = hdr->resid;
261 td_verror(td, io_u->error, "xfer");
262 return FIO_Q_COMPLETED;
268 static struct io_u *fio_sgio_event(struct thread_data *td, int event)
270 struct sgio_data *sd = td->io_ops->data;
272 return sd->events[event];
275 static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs)
277 struct sgio_data *sd = td->io_ops->data;
279 struct sg_io_hdr *hdr;
280 unsigned char buf[8];
283 memset(&io_u, 0, sizeof(io_u));
284 io_u.file = td->files[0];
287 sgio_hdr_init(sd, hdr, &io_u, 0);
288 memset(buf, 0, sizeof(buf));
291 hdr->dxfer_direction = SG_DXFER_FROM_DEV;
293 hdr->dxfer_len = sizeof(buf);
295 ret = fio_sgio_doio(td, &io_u, 1);
299 *bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
303 static void fio_sgio_cleanup(struct thread_data *td)
305 struct sgio_data *sd = td->io_ops->data;
317 static int fio_sgio_init(struct thread_data *td)
319 struct sgio_data *sd;
321 sd = malloc(sizeof(*sd));
322 memset(sd, 0, sizeof(*sd));
323 sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
324 memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
325 sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
326 memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
327 sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
328 memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
329 sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
330 memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
331 sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
332 memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
334 td->io_ops->data = sd;
337 * we want to do it, regardless of whether odirect is set or not
339 td->o.override_sync = 1;
343 static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
345 struct sgio_data *sd = td->io_ops->data;
348 if (f->filetype == FIO_TYPE_BD) {
349 if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
350 td_verror(td, errno, "ioctl");
353 } else if (f->filetype == FIO_TYPE_CHAR) {
356 if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
357 td_verror(td, errno, "ioctl");
361 ret = fio_sgio_get_bs(td, &bs);
365 log_err("ioengine sg only works on block devices\n");
371 if (f->filetype == FIO_TYPE_BD) {
372 td->io_ops->getevents = NULL;
373 td->io_ops->event = NULL;
379 static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
381 struct sgio_data *sd = td->io_ops->data;
384 ret = generic_open_file(td, f);
388 if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
389 ret = generic_close_file(td, f);
396 static struct ioengine_ops ioengine = {
398 .version = FIO_IOOPS_VERSION,
399 .init = fio_sgio_init,
400 .prep = fio_sgio_prep,
401 .queue = fio_sgio_queue,
402 .getevents = fio_sgio_getevents,
403 .event = fio_sgio_event,
404 .cleanup = fio_sgio_cleanup,
405 .open_file = fio_sgio_open,
406 .close_file = generic_close_file,
407 .get_file_size = generic_get_file_size,
408 .flags = FIO_SYNCIO | FIO_RAWIO,
411 #else /* FIO_HAVE_SGIO */
414 * When we have a proper configure system in place, we simply wont build
415 * and install this io engine. For now install a crippled version that
416 * just complains and fails to load.
418 static int fio_sgio_init(struct thread_data fio_unused *td)
420 log_err("fio: ioengine sg not available\n");
424 static struct ioengine_ops ioengine = {
426 .version = FIO_IOOPS_VERSION,
427 .init = fio_sgio_init,
432 static void fio_init fio_sgio_register(void)
434 register_ioengine(&ioengine);
437 static void fio_exit fio_sgio_unregister(void)
439 unregister_ioengine(&ioengine);