| /* |
| * scsi generic sg v3 io engine |
| * |
| */ |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <sys/poll.h> |
| |
| #include "../fio.h" |
| #include "../os.h" |
| |
| #ifdef FIO_HAVE_SGIO |
| |
| struct sgio_cmd { |
| unsigned char cdb[10]; |
| int nr; |
| }; |
| |
| struct sgio_data { |
| struct sgio_cmd *cmds; |
| struct io_u **events; |
| struct pollfd *pfds; |
| int *fd_flags; |
| void *sgbuf; |
| unsigned int bs; |
| }; |
| |
| static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr, |
| struct io_u *io_u, int fs) |
| { |
| struct sgio_cmd *sc = &sd->cmds[io_u->index]; |
| |
| memset(hdr, 0, sizeof(*hdr)); |
| memset(sc->cdb, 0, sizeof(sc->cdb)); |
| |
| hdr->interface_id = 'S'; |
| hdr->cmdp = sc->cdb; |
| hdr->cmd_len = sizeof(sc->cdb); |
| hdr->pack_id = io_u->index; |
| hdr->usr_ptr = io_u; |
| |
| if (fs) { |
| hdr->dxferp = io_u->xfer_buf; |
| hdr->dxfer_len = io_u->xfer_buflen; |
| } |
| } |
| |
| static int fio_sgio_ioctl_getevents(struct thread_data *td, int fio_unused min, |
| int max, struct timespec fio_unused *t) |
| { |
| assert(max <= 1); |
| |
| /* |
| * we can only have one finished io_u for sync io, since the depth |
| * is always 1 |
| */ |
| if (list_empty(&td->io_u_busylist)) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int pollin_events(struct pollfd *pfds, int fds) |
| { |
| int i; |
| |
| for (i = 0; i < fds; i++) |
| if (pfds[i].revents & POLLIN) |
| return 1; |
| |
| return 0; |
| } |
| |
| static int fio_sgio_getevents(struct thread_data *td, int min, int max, |
| struct timespec fio_unused *t) |
| { |
| /* |
| * normally hard coding &td->files[0] is a bug that needs to be fixed, |
| * but it's ok here as all files should point to the same device. |
| */ |
| struct fio_file *f = &td->files[0]; |
| struct sgio_data *sd = td->io_ops->data; |
| int left = max, ret, events, i, r = 0; |
| void *buf = sd->sgbuf; |
| |
| /* |
| * Fill in the file descriptors |
| */ |
| for_each_file(td, f, i) { |
| /* |
| * don't block for min events == 0 |
| */ |
| if (!min) { |
| sd->fd_flags[i] = fcntl(f->fd, F_GETFL); |
| fcntl(f->fd, F_SETFL, sd->fd_flags[i] | O_NONBLOCK); |
| } |
| sd->pfds[i].fd = f->fd; |
| sd->pfds[i].events = POLLIN; |
| } |
| |
| while (left) { |
| void *p; |
| |
| do { |
| if (!min) |
| break; |
| |
| ret = poll(sd->pfds, td->nr_files, -1); |
| if (ret < 0) { |
| td_verror(td, errno); |
| if (!r) |
| r = -1; |
| break; |
| } else if (!ret) |
| continue; |
| |
| if (pollin_events(sd->pfds, td->nr_files)) |
| break; |
| } while (1); |
| |
| if (r < 0) |
| break; |
| |
| re_read: |
| p = buf; |
| events = 0; |
| for_each_file(td, f, i) { |
| ret = read(f->fd, p, left * sizeof(struct sg_io_hdr)); |
| if (ret < 0) { |
| if (errno == EAGAIN) |
| continue; |
| td_verror(td, errno); |
| r = -1; |
| break; |
| } else if (ret) { |
| p += ret; |
| events += ret / sizeof(struct sg_io_hdr); |
| } |
| } |
| |
| if (r < 0) |
| break; |
| if (!events) { |
| usleep(1000); |
| goto re_read; |
| } |
| |
| left -= events; |
| r += events; |
| |
| for (i = 0; i < events; i++) { |
| struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i; |
| |
| sd->events[i] = hdr->usr_ptr; |
| } |
| } |
| |
| if (!min) { |
| for_each_file(td, f, i) |
| fcntl(f->fd, F_SETFL, sd->fd_flags[i]); |
| } |
| |
| return r; |
| } |
| |
| static int fio_sgio_ioctl_doio(struct thread_data *td, |
| struct fio_file *f, struct io_u *io_u) |
| { |
| struct sgio_data *sd = td->io_ops->data; |
| struct sg_io_hdr *hdr = &io_u->hdr; |
| |
| sd->events[0] = io_u; |
| |
| return ioctl(f->fd, SG_IO, hdr); |
| } |
| |
| static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int sync) |
| { |
| struct sg_io_hdr *hdr = &io_u->hdr; |
| int ret; |
| |
| ret = write(f->fd, hdr, sizeof(*hdr)); |
| if (ret < 0) |
| return errno; |
| |
| if (sync) { |
| ret = read(f->fd, hdr, sizeof(*hdr)); |
| if (ret < 0) |
| return errno; |
| } |
| |
| return 0; |
| } |
| |
| static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int sync) |
| { |
| struct fio_file *f = io_u->file; |
| |
| if (td->filetype == FIO_TYPE_BD) |
| return fio_sgio_ioctl_doio(td, f, io_u); |
| |
| return fio_sgio_rw_doio(f, io_u, sync); |
| } |
| |
| static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u) |
| { |
| struct sg_io_hdr *hdr = &io_u->hdr; |
| struct sgio_data *sd = td->io_ops->data; |
| int nr_blocks, lba; |
| |
| if (io_u->xfer_buflen & (sd->bs - 1)) { |
| log_err("read/write not sector aligned\n"); |
| return EINVAL; |
| } |
| |
| if (io_u->ddir == DDIR_READ) { |
| sgio_hdr_init(sd, hdr, io_u, 1); |
| |
| hdr->dxfer_direction = SG_DXFER_FROM_DEV; |
| hdr->cmdp[0] = 0x28; |
| } else if (io_u->ddir == DDIR_WRITE) { |
| sgio_hdr_init(sd, hdr, io_u, 1); |
| |
| hdr->dxfer_direction = SG_DXFER_TO_DEV; |
| hdr->cmdp[0] = 0x2a; |
| } else { |
| sgio_hdr_init(sd, hdr, io_u, 0); |
| |
| hdr->dxfer_direction = SG_DXFER_NONE; |
| hdr->cmdp[0] = 0x35; |
| } |
| |
| if (hdr->dxfer_direction != SG_DXFER_NONE) { |
| nr_blocks = io_u->xfer_buflen / sd->bs; |
| lba = io_u->offset / sd->bs; |
| hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff); |
| hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff); |
| hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff); |
| hdr->cmdp[5] = (unsigned char) (lba & 0xff); |
| hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff); |
| hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff); |
| } |
| |
| return 0; |
| } |
| |
| static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u) |
| { |
| struct sg_io_hdr *hdr = &io_u->hdr; |
| int ret; |
| |
| ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC); |
| |
| if (ret < 0) |
| io_u->error = errno; |
| else if (hdr->status) { |
| io_u->resid = hdr->resid; |
| io_u->error = EIO; |
| } |
| |
| return io_u->error; |
| } |
| |
| static struct io_u *fio_sgio_event(struct thread_data *td, int event) |
| { |
| struct sgio_data *sd = td->io_ops->data; |
| |
| return sd->events[event]; |
| } |
| |
| static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs) |
| { |
| struct sgio_data *sd = td->io_ops->data; |
| struct io_u *io_u; |
| struct sg_io_hdr *hdr; |
| unsigned char buf[8]; |
| int ret; |
| |
| io_u = __get_io_u(td); |
| io_u->file = &td->files[0]; |
| assert(io_u); |
| |
| hdr = &io_u->hdr; |
| sgio_hdr_init(sd, hdr, io_u, 0); |
| memset(buf, 0, sizeof(buf)); |
| |
| hdr->cmdp[0] = 0x25; |
| hdr->dxfer_direction = SG_DXFER_FROM_DEV; |
| hdr->dxferp = buf; |
| hdr->dxfer_len = sizeof(buf); |
| |
| ret = fio_sgio_doio(td, io_u, 1); |
| if (ret) { |
| put_io_u(td, io_u); |
| return ret; |
| } |
| |
| *bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7]; |
| put_io_u(td, io_u); |
| return 0; |
| } |
| |
| static void fio_sgio_cleanup(struct thread_data *td) |
| { |
| struct sgio_data *sd = td->io_ops->data; |
| |
| if (sd) { |
| free(sd->events); |
| free(sd->cmds); |
| free(sd->fd_flags); |
| free(sd->pfds); |
| free(sd->sgbuf); |
| free(sd); |
| |
| td->io_ops->data = NULL; |
| } |
| } |
| |
| static int fio_sgio_init(struct thread_data *td) |
| { |
| struct fio_file *f = &td->files[0]; |
| struct sgio_data *sd; |
| unsigned int bs; |
| int ret; |
| |
| sd = malloc(sizeof(*sd)); |
| memset(sd, 0, sizeof(*sd)); |
| sd->cmds = malloc(td->iodepth * sizeof(struct sgio_cmd)); |
| memset(sd->cmds, 0, td->iodepth * sizeof(struct sgio_cmd)); |
| sd->events = malloc(td->iodepth * sizeof(struct io_u *)); |
| memset(sd->events, 0, td->iodepth * sizeof(struct io_u *)); |
| sd->pfds = malloc(sizeof(struct pollfd) * td->nr_files); |
| memset(sd->pfds, 0, sizeof(struct pollfd) * td->nr_files); |
| sd->fd_flags = malloc(sizeof(int) * td->nr_files); |
| memset(sd->fd_flags, 0, sizeof(int) * td->nr_files); |
| sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->iodepth); |
| memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->iodepth); |
| |
| td->io_ops->data = sd; |
| |
| if (td->filetype == FIO_TYPE_BD) { |
| if (ioctl(f->fd, BLKSSZGET, &bs) < 0) { |
| td_verror(td, errno); |
| goto err; |
| } |
| } else if (td->filetype == FIO_TYPE_CHAR) { |
| int version; |
| |
| if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) { |
| td_verror(td, errno); |
| goto err; |
| } |
| |
| ret = fio_sgio_get_bs(td, &bs); |
| if (ret) |
| goto err; |
| } else { |
| log_err("ioengine sgio only works on block devices\n"); |
| goto err; |
| } |
| |
| sd->bs = bs; |
| |
| if (td->filetype == FIO_TYPE_BD) |
| td->io_ops->getevents = fio_sgio_ioctl_getevents; |
| else |
| td->io_ops->getevents = fio_sgio_getevents; |
| |
| /* |
| * we want to do it, regardless of whether odirect is set or not |
| */ |
| td->override_sync = 1; |
| return 0; |
| err: |
| free(sd->events); |
| free(sd->cmds); |
| free(sd->fd_flags); |
| free(sd->pfds); |
| free(sd->sgbuf); |
| free(sd); |
| td->io_ops->data = NULL; |
| return 1; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "sg", |
| .version = FIO_IOOPS_VERSION, |
| .init = fio_sgio_init, |
| .prep = fio_sgio_prep, |
| .queue = fio_sgio_queue, |
| .getevents = fio_sgio_getevents, |
| .event = fio_sgio_event, |
| .cleanup = fio_sgio_cleanup, |
| .flags = FIO_SYNCIO | FIO_RAWIO, |
| }; |
| |
| #else /* FIO_HAVE_SGIO */ |
| |
| /* |
| * When we have a proper configure system in place, we simply wont build |
| * and install this io engine. For now install a crippled version that |
| * just complains and fails to load. |
| */ |
| static int fio_sgio_init(struct thread_data fio_unused *td) |
| { |
| fprintf(stderr, "fio: sgio not available\n"); |
| return 1; |
| } |
| |
| static struct ioengine_ops ioengine = { |
| .name = "sgio", |
| .version = FIO_IOOPS_VERSION, |
| .init = fio_sgio_init, |
| }; |
| |
| #endif |
| |
| static void fio_init fio_sgio_register(void) |
| { |
| register_ioengine(&ioengine); |
| } |
| |
| static void fio_exit fio_sgio_unregister(void) |
| { |
| unregister_ioengine(&ioengine); |
| } |