[fio.git] / engines / sg.c

/*
 * sg engine
 *
 * IO engine that uses the Linux SG v3 interface to talk to SCSI devices
 *
 */
#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;
	int type_checked;
};

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 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)
{
	struct sgio_data *sd = td->io_ops->data;
	int left = max, ret, r = 0;
	void *buf = sd->sgbuf;
	unsigned int i, events;
	struct fio_file *f;

	/*
	 * 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->o.nr_files, -1);
			if (ret < 0) {
				if (!r)
					r = -errno;
				td_verror(td, errno, "poll");
				break;
			} else if (!ret)
				continue;

			if (pollin_events(sd->pfds, td->o.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;
				r = -errno;
				td_verror(td, errno, "read");
				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;
	int ret;

	sd->events[0] = io_u;

	ret = ioctl(f->fd, SG_IO, hdr);
	if (ret < 0)
		return ret;

	return FIO_Q_COMPLETED;
}

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 ret;

	if (sync) {
		ret = read(f->fd, hdr, sizeof(*hdr));
		if (ret < 0)
			return ret;
		return FIO_Q_COMPLETED;
	}

	return FIO_Q_QUEUED;
}

static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int sync)
{
	struct fio_file *f = io_u->file;

	if (f->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;
	}

	if (io_u->error) {
		td_verror(td, io_u->error, "xfer");
		return FIO_Q_COMPLETED;
	}

	return ret;
}

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 sgio_data *sd;

	sd = malloc(sizeof(*sd));
	memset(sd, 0, sizeof(*sd));
	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);

	td->io_ops->data = sd;

	/*
	 * we want to do it, regardless of whether odirect is set or not
	 */
	td->o.override_sync = 1;
	return 0;
}

static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
{
	struct sgio_data *sd = td->io_ops->data;
	unsigned int bs;

	if (f->filetype == FIO_TYPE_BD) {
		if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
			td_verror(td, errno, "ioctl");
			return 1;
		}
	} else if (f->filetype == FIO_TYPE_CHAR) {
		int version, ret;

		if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
			td_verror(td, errno, "ioctl");
			return 1;
		}

		ret = fio_sgio_get_bs(td, &bs);
		if (ret)
			return 1;
	} else {
		log_err("ioengine sgio only works on block devices\n");
		return 1;
	}

	sd->bs = bs;

	if (f->filetype == FIO_TYPE_BD) {
		td->io_ops->getevents = NULL;
		td->io_ops->event = NULL;
	}

	return 0;
}

static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
{
	struct sgio_data *sd = td->io_ops->data;
	int ret;

	ret = generic_open_file(td, f);
	if (ret)
		return ret;

	if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
		generic_close_file(td, f);
		return 1;
	}

	return 0;
}

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,
	.open_file	= fio_sgio_open,
	.close_file	= generic_close_file,
	.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);
}
Commit	Line	Data
2866c82d	1	/*
da751ca9 JA	2	* sg engine
	3	*
	4	* IO engine that uses the Linux SG v3 interface to talk to SCSI devices
2866c82d JA	5	*
	6	*/
	7	#include <stdio.h>
	8	#include <stdlib.h>
	9	#include <unistd.h>
	10	#include <errno.h>
	11	#include <assert.h>
	12	#include <sys/poll.h>
5f350952 JA	13
	14	#include "../fio.h"
	15	#include "../os.h"
2866c82d	16
34cfcdaf JA	17	#ifdef FIO_HAVE_SGIO
34cfcdaf JA	18
2866c82d JA	19	struct sgio_cmd {
	20	unsigned char cdb[10];
	21	int nr;
	22	};
	23
	24	struct sgio_data {
	25	struct sgio_cmd *cmds;
	26	struct io_u **events;
dc0deca2 JA	27	struct pollfd *pfds;
	28	int *fd_flags;
	29	void *sgbuf;
2866c82d	30	unsigned int bs;
b5af8293	31	int type_checked;
2866c82d JA	32	};
	33
	34	static void sgio_hdr_init(struct sgio_data sd, struct sg_io_hdr hdr,
	35	struct io_u *io_u, int fs)
	36	{
	37	struct sgio_cmd *sc = &sd->cmds[io_u->index];
	38
	39	memset(hdr, 0, sizeof(*hdr));
	40	memset(sc->cdb, 0, sizeof(sc->cdb));
	41
	42	hdr->interface_id = 'S';
	43	hdr->cmdp = sc->cdb;
	44	hdr->cmd_len = sizeof(sc->cdb);
	45	hdr->pack_id = io_u->index;
	46	hdr->usr_ptr = io_u;
	47
	48	if (fs) {
cec6b55d JA	49	hdr->dxferp = io_u->xfer_buf;
cec6b55d JA	50	hdr->dxfer_len = io_u->xfer_buflen;
2866c82d JA	51	}
	52	}
	53
adee86c5 JA	54	static int pollin_events(struct pollfd *pfds, int fds)
	55	{
	56	int i;
	57
	58	for (i = 0; i < fds; i++)
	59	if (pfds[i].revents & POLLIN)
	60	return 1;
	61
	62	return 0;
	63	}
2866c82d JA	64
	65	static int fio_sgio_getevents(struct thread_data *td, int min, int max,
	66	struct timespec fio_unused *t)
	67	{
	68	struct sgio_data *sd = td->io_ops->data;
af52b345	69	int left = max, ret, r = 0;
dc0deca2	70	void *buf = sd->sgbuf;
af52b345	71	unsigned int i, events;
946ff865	72	struct fio_file *f;
2866c82d JA	73
2866c82d JA	74	/*
adee86c5	75	* Fill in the file descriptors
2866c82d	76	*/
adee86c5 JA	77	for_each_file(td, f, i) {
	78	/*
	79	* don't block for min events == 0
	80	*/
	81	if (!min) {
dc0deca2 JA	82	sd->fd_flags[i] = fcntl(f->fd, F_GETFL);
dc0deca2 JA	83	fcntl(f->fd, F_SETFL, sd->fd_flags[i] \| O_NONBLOCK);
adee86c5	84	}
dc0deca2 JA	85	sd->pfds[i].fd = f->fd;
dc0deca2 JA	86	sd->pfds[i].events = POLLIN;
2866c82d JA	87	}
	88
	89	while (left) {
adee86c5 JA	90	void *p;
adee86c5 JA	91
2866c82d JA	92	do {
	93	if (!min)
	94	break;
adee86c5	95
2dc1bbeb	96	ret = poll(sd->pfds, td->o.nr_files, -1);
adee86c5	97	if (ret < 0) {
adee86c5	98	if (!r)
22819ec2	99	r = -errno;
e1161c32	100	td_verror(td, errno, "poll");
adee86c5 JA	101	break;
	102	} else if (!ret)
	103	continue;
	104
2dc1bbeb	105	if (pollin_events(sd->pfds, td->o.nr_files))
2866c82d JA	106	break;
	107	} while (1);
	108
adee86c5	109	if (r < 0)
2866c82d	110	break;
adee86c5 JA	111
	112	re_read:
	113	p = buf;
	114	events = 0;
	115	for_each_file(td, f, i) {
	116	ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
	117	if (ret < 0) {
	118	if (errno == EAGAIN)
	119	continue;
22819ec2	120	r = -errno;
e1161c32	121	td_verror(td, errno, "read");
adee86c5 JA	122	break;
	123	} else if (ret) {
	124	p += ret;
	125	events += ret / sizeof(struct sg_io_hdr);
	126	}
	127	}
	128
	129	if (r < 0)
2866c82d	130	break;
adee86c5 JA	131	if (!events) {
	132	usleep(1000);
	133	goto re_read;
	134	}
2866c82d	135
2866c82d JA	136	left -= events;
	137	r += events;
	138
	139	for (i = 0; i < events; i++) {
	140	struct sg_io_hdr hdr = (struct sg_io_hdr ) buf + i;
	141
	142	sd->events[i] = hdr->usr_ptr;
	143	}
	144	}
	145
adee86c5 JA	146	if (!min) {
adee86c5 JA	147	for_each_file(td, f, i)
dc0deca2	148	fcntl(f->fd, F_SETFL, sd->fd_flags[i]);
adee86c5	149	}
2866c82d	150
2866c82d JA	151	return r;
	152	}
	153
7a16dd02 JA	154	static int fio_sgio_ioctl_doio(struct thread_data *td,
7a16dd02 JA	155	struct fio_file f, struct io_u io_u)
2866c82d JA	156	{
	157	struct sgio_data *sd = td->io_ops->data;
	158	struct sg_io_hdr *hdr = &io_u->hdr;
36167d82	159	int ret;
2866c82d JA	160
	161	sd->events[0] = io_u;
	162
36167d82 JA	163	ret = ioctl(f->fd, SG_IO, hdr);
36167d82 JA	164	if (ret < 0)
a05bd42d	165	return ret;
36167d82 JA	166
36167d82 JA	167	return FIO_Q_COMPLETED;
2866c82d JA	168	}
2866c82d JA	169
7a16dd02	170	static int fio_sgio_rw_doio(struct fio_file f, struct io_u io_u, int sync)
2866c82d JA	171	{
	172	struct sg_io_hdr *hdr = &io_u->hdr;
	173	int ret;
	174
53cdc686	175	ret = write(f->fd, hdr, sizeof(*hdr));
2866c82d	176	if (ret < 0)
a05bd42d	177	return ret;
2866c82d JA	178
2866c82d JA	179	if (sync) {
53cdc686	180	ret = read(f->fd, hdr, sizeof(*hdr));
2866c82d	181	if (ret < 0)
a05bd42d	182	return ret;
36167d82	183	return FIO_Q_COMPLETED;
2866c82d JA	184	}
2866c82d JA	185
36167d82	186	return FIO_Q_QUEUED;
2866c82d JA	187	}
	188
	189	static int fio_sgio_doio(struct thread_data td, struct io_u io_u, int sync)
	190	{
53cdc686 JA	191	struct fio_file *f = io_u->file;
53cdc686 JA	192
af52b345	193	if (f->filetype == FIO_TYPE_BD)
53cdc686	194	return fio_sgio_ioctl_doio(td, f, io_u);
2866c82d	195
7a16dd02	196	return fio_sgio_rw_doio(f, io_u, sync);
2866c82d JA	197	}
2866c82d JA	198
2866c82d JA	199	static int fio_sgio_prep(struct thread_data td, struct io_u io_u)
	200	{
	201	struct sg_io_hdr *hdr = &io_u->hdr;
	202	struct sgio_data *sd = td->io_ops->data;
	203	int nr_blocks, lba;
	204
cec6b55d	205	if (io_u->xfer_buflen & (sd->bs - 1)) {
2866c82d JA	206	log_err("read/write not sector aligned\n");
	207	return EINVAL;
	208	}
	209
2866c82d	210	if (io_u->ddir == DDIR_READ) {
87dc1ab1 JA	211	sgio_hdr_init(sd, hdr, io_u, 1);
87dc1ab1 JA	212
2866c82d JA	213	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
2866c82d JA	214	hdr->cmdp[0] = 0x28;
87dc1ab1 JA	215	} else if (io_u->ddir == DDIR_WRITE) {
	216	sgio_hdr_init(sd, hdr, io_u, 1);
	217
2866c82d JA	218	hdr->dxfer_direction = SG_DXFER_TO_DEV;
2866c82d JA	219	hdr->cmdp[0] = 0x2a;
87dc1ab1 JA	220	} else {
	221	sgio_hdr_init(sd, hdr, io_u, 0);
	222
	223	hdr->dxfer_direction = SG_DXFER_NONE;
	224	hdr->cmdp[0] = 0x35;
	225	}
	226
	227	if (hdr->dxfer_direction != SG_DXFER_NONE) {
cec6b55d	228	nr_blocks = io_u->xfer_buflen / sd->bs;
87dc1ab1	229	lba = io_u->offset / sd->bs;
1e97cce9 JA	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);
2866c82d JA	236	}
2866c82d JA	237
2866c82d JA	238	return 0;
	239	}
	240
	241	static int fio_sgio_queue(struct thread_data td, struct io_u io_u)
	242	{
	243	struct sg_io_hdr *hdr = &io_u->hdr;
	244	int ret;
	245
87dc1ab1	246	ret = fio_sgio_doio(td, io_u, io_u->ddir == DDIR_SYNC);
2866c82d JA	247
	248	if (ret < 0)
	249	io_u->error = errno;
	250	else if (hdr->status) {
	251	io_u->resid = hdr->resid;
	252	io_u->error = EIO;
	253	}
	254
95bcd815	255	if (io_u->error) {
e1161c32	256	td_verror(td, io_u->error, "xfer");
36167d82	257	return FIO_Q_COMPLETED;
95bcd815 JA	258	}
95bcd815 JA	259
36167d82	260	return ret;
2866c82d JA	261	}
	262
	263	static struct io_u fio_sgio_event(struct thread_data td, int event)
	264	{
	265	struct sgio_data *sd = td->io_ops->data;
	266
	267	return sd->events[event];
	268	}
	269
	270	static int fio_sgio_get_bs(struct thread_data td, unsigned int bs)
	271	{
	272	struct sgio_data *sd = td->io_ops->data;
	273	struct io_u *io_u;
	274	struct sg_io_hdr *hdr;
	275	unsigned char buf[8];
	276	int ret;
	277
	278	io_u = __get_io_u(td);
6ab9e267	279	io_u->file = &td->files[0];
2866c82d JA	280	assert(io_u);
	281
	282	hdr = &io_u->hdr;
	283	sgio_hdr_init(sd, hdr, io_u, 0);
	284	memset(buf, 0, sizeof(buf));
	285
	286	hdr->cmdp[0] = 0x25;
	287	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
	288	hdr->dxferp = buf;
	289	hdr->dxfer_len = sizeof(buf);
	290
	291	ret = fio_sgio_doio(td, io_u, 1);
	292	if (ret) {
	293	put_io_u(td, io_u);
	294	return ret;
	295	}
	296
	297	*bs = (buf[4] << 24) \| (buf[5] << 16) \| (buf[6] << 8) \| buf[7];
	298	put_io_u(td, io_u);
	299	return 0;
	300	}
	301
	302	static void fio_sgio_cleanup(struct thread_data *td)
	303	{
dc0deca2 JA	304	struct sgio_data *sd = td->io_ops->data;
	305
	306	if (sd) {
	307	free(sd->events);
	308	free(sd->cmds);
	309	free(sd->fd_flags);
	310	free(sd->pfds);
	311	free(sd->sgbuf);
	312	free(sd);
	313
2866c82d JA	314	td->io_ops->data = NULL;
	315	}
	316	}
	317
	318	static int fio_sgio_init(struct thread_data *td)
	319	{
	320	struct sgio_data *sd;
2866c82d JA	321
2866c82d JA	322	sd = malloc(sizeof(*sd));
cb781c75	323	memset(sd, 0, sizeof(*sd));
2dc1bbeb JA	324	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
	325	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
	326	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
	327	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
	328	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
	329	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
	330	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
	331	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
	332	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
	333	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
dc0deca2	334
2866c82d JA	335	td->io_ops->data = sd;
2866c82d JA	336
b5af8293 JA	337	/*
	338	* we want to do it, regardless of whether odirect is set or not
	339	*/
2dc1bbeb	340	td->o.override_sync = 1;
b5af8293 JA	341	return 0;
	342	}
	343
	344	static int fio_sgio_type_check(struct thread_data td, struct fio_file f)
	345	{
	346	struct sgio_data *sd = td->io_ops->data;
	347	unsigned int bs;
	348
af52b345	349	if (f->filetype == FIO_TYPE_BD) {
53cdc686	350	if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
e1161c32	351	td_verror(td, errno, "ioctl");
b5af8293	352	return 1;
2866c82d	353	}
af52b345	354	} else if (f->filetype == FIO_TYPE_CHAR) {
b5af8293	355	int version, ret;
2866c82d	356
53cdc686	357	if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
e1161c32	358	td_verror(td, errno, "ioctl");
b5af8293	359	return 1;
2866c82d JA	360	}
	361
	362	ret = fio_sgio_get_bs(td, &bs);
	363	if (ret)
b5af8293	364	return 1;
2866c82d JA	365	} else {
2866c82d JA	366	log_err("ioengine sgio only works on block devices\n");
b5af8293	367	return 1;
2866c82d JA	368	}
	369
	370	sd->bs = bs;
	371
af52b345	372	if (f->filetype == FIO_TYPE_BD) {
36167d82 JA	373	td->io_ops->getevents = NULL;
	374	td->io_ops->event = NULL;
	375	}
2866c82d	376
2866c82d	377	return 0;
b5af8293 JA	378	}
	379
	380	static int fio_sgio_open(struct thread_data td, struct fio_file f)
	381	{
	382	struct sgio_data *sd = td->io_ops->data;
	383	int ret;
	384
	385	ret = generic_open_file(td, f);
	386	if (ret)
	387	return ret;
	388
15ba640a	389	if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
b5af8293 JA	390	generic_close_file(td, f);
	391	return 1;
	392	}
	393
	394	return 0;
2866c82d JA	395	}
2866c82d JA	396
5f350952	397	static struct ioengine_ops ioengine = {
2866c82d JA	398	.name = "sg",
	399	.version = FIO_IOOPS_VERSION,
	400	.init = fio_sgio_init,
	401	.prep = fio_sgio_prep,
	402	.queue = fio_sgio_queue,
	403	.getevents = fio_sgio_getevents,
	404	.event = fio_sgio_event,
	405	.cleanup = fio_sgio_cleanup,
b5af8293 JA	406	.open_file = fio_sgio_open,
b5af8293 JA	407	.close_file = generic_close_file,
b2a15192	408	.flags = FIO_SYNCIO \| FIO_RAWIO,
2866c82d	409	};
34cfcdaf JA	410
	411	#else /* FIO_HAVE_SGIO */
	412
	413	/*
	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.
	417	*/
	418	static int fio_sgio_init(struct thread_data fio_unused *td)
	419	{
	420	fprintf(stderr, "fio: sgio not available\n");
	421	return 1;
	422	}
	423
5f350952	424	static struct ioengine_ops ioengine = {
34cfcdaf JA	425	.name = "sgio",
	426	.version = FIO_IOOPS_VERSION,
	427	.init = fio_sgio_init,
	428	};
	429
	430	#endif
5f350952 JA	431
	432	static void fio_init fio_sgio_register(void)
	433	{
	434	register_ioengine(&ioengine);
	435	}
	436
	437	static void fio_exit fio_sgio_unregister(void)
	438	{
	439	unregister_ioengine(&ioengine);
	440	}