[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"

#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, unsigned int min,
			      unsigned 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] = fio_set_fd_nonblocking(f->fd, "sg");
		else
			sd->fd_flags[i] = -1;

		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) {
			if (sd->fd_flags[i] == -1)
				continue;

			if (fcntl(f->fd, F_SETFL, sd->fd_flags[i]) < 0)
				log_err("fio: sg failed to restore fcntl flags: %s\n", strerror(errno));
		}
	}

	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 do_sync)
{
	struct sg_io_hdr *hdr = &io_u->hdr;
	int ret;

	ret = write(f->fd, hdr, sizeof(*hdr));
	if (ret < 0)
		return ret;

	if (do_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 do_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, do_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, do_sync = 0;

	fio_ro_check(td, io_u);

	if (td->o.sync_io || td->o.odirect || ddir_sync(io_u->ddir))
		do_sync = 1;

	ret = fio_sgio_doio(td, io_u, do_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;

	memset(&io_u, 0, sizeof(io_u));
	io_u.file = td->files[0];

	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)
		return ret;

	*bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
	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);
	}
}

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 sg 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)) {
		ret = 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,
	.get_file_size	= generic_get_file_size,
	.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)
{
	log_err("fio: ioengine sg not available\n");
	return 1;
}

static struct ioengine_ops ioengine = {
	.name		= "sg",
	.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
5f350952 JA	14	#include "../fio.h"
2866c82d	15
34cfcdaf JA	16	#ifdef FIO_HAVE_SGIO
34cfcdaf JA	17
2866c82d JA	18	struct sgio_cmd {
	19	unsigned char cdb[10];
	20	int nr;
	21	};
	22
	23	struct sgio_data {
	24	struct sgio_cmd *cmds;
	25	struct io_u **events;
dc0deca2 JA	26	struct pollfd *pfds;
	27	int *fd_flags;
	28	void *sgbuf;
2866c82d	29	unsigned int bs;
b5af8293	30	int type_checked;
2866c82d JA	31	};
	32
	33	static void sgio_hdr_init(struct sgio_data sd, struct sg_io_hdr hdr,
	34	struct io_u *io_u, int fs)
	35	{
	36	struct sgio_cmd *sc = &sd->cmds[io_u->index];
	37
	38	memset(hdr, 0, sizeof(*hdr));
	39	memset(sc->cdb, 0, sizeof(sc->cdb));
	40
	41	hdr->interface_id = 'S';
	42	hdr->cmdp = sc->cdb;
	43	hdr->cmd_len = sizeof(sc->cdb);
	44	hdr->pack_id = io_u->index;
	45	hdr->usr_ptr = io_u;
	46
	47	if (fs) {
cec6b55d JA	48	hdr->dxferp = io_u->xfer_buf;
cec6b55d JA	49	hdr->dxfer_len = io_u->xfer_buflen;
2866c82d JA	50	}
	51	}
	52
adee86c5 JA	53	static int pollin_events(struct pollfd *pfds, int fds)
	54	{
	55	int i;
	56
	57	for (i = 0; i < fds; i++)
	58	if (pfds[i].revents & POLLIN)
	59	return 1;
	60
	61	return 0;
	62	}
2866c82d	63
e7d2e616 JA	64	static int fio_sgio_getevents(struct thread_data *td, unsigned int min,
e7d2e616 JA	65	unsigned int max, struct timespec fio_unused *t)
2866c82d JA	66	{
2866c82d JA	67	struct sgio_data *sd = td->io_ops->data;
af52b345	68	int left = max, ret, r = 0;
dc0deca2	69	void *buf = sd->sgbuf;
af52b345	70	unsigned int i, events;
946ff865	71	struct fio_file *f;
2866c82d JA	72
2866c82d JA	73	/*
adee86c5	74	* Fill in the file descriptors
2866c82d	75	*/
adee86c5 JA	76	for_each_file(td, f, i) {
	77	/*
	78	* don't block for min events == 0
	79	*/
4a851614	80	if (!min)
3a35845f JA	81	sd->fd_flags[i] = fio_set_fd_nonblocking(f->fd, "sg");
	82	else
	83	sd->fd_flags[i] = -1;
4a851614	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	146	if (!min) {
affe05a9	147	for_each_file(td, f, i) {
3a35845f JA	148	if (sd->fd_flags[i] == -1)
	149	continue;
	150
affe05a9 JA	151	if (fcntl(f->fd, F_SETFL, sd->fd_flags[i]) < 0)
	152	log_err("fio: sg failed to restore fcntl flags: %s\n", strerror(errno));
	153	}
adee86c5	154	}
2866c82d	155
2866c82d JA	156	return r;
	157	}
	158
7a16dd02 JA	159	static int fio_sgio_ioctl_doio(struct thread_data *td,
7a16dd02 JA	160	struct fio_file f, struct io_u io_u)
2866c82d JA	161	{
	162	struct sgio_data *sd = td->io_ops->data;
	163	struct sg_io_hdr *hdr = &io_u->hdr;
36167d82	164	int ret;
2866c82d JA	165
	166	sd->events[0] = io_u;
	167
36167d82 JA	168	ret = ioctl(f->fd, SG_IO, hdr);
36167d82 JA	169	if (ret < 0)
a05bd42d	170	return ret;
36167d82 JA	171
36167d82 JA	172	return FIO_Q_COMPLETED;
2866c82d JA	173	}
2866c82d JA	174
2b13e716	175	static int fio_sgio_rw_doio(struct fio_file f, struct io_u io_u, int do_sync)
2866c82d JA	176	{
	177	struct sg_io_hdr *hdr = &io_u->hdr;
	178	int ret;
	179
53cdc686	180	ret = write(f->fd, hdr, sizeof(*hdr));
2866c82d	181	if (ret < 0)
a05bd42d	182	return ret;
2866c82d	183
2b13e716	184	if (do_sync) {
53cdc686	185	ret = read(f->fd, hdr, sizeof(*hdr));
2866c82d	186	if (ret < 0)
a05bd42d	187	return ret;
36167d82	188	return FIO_Q_COMPLETED;
2866c82d JA	189	}
2866c82d JA	190
36167d82	191	return FIO_Q_QUEUED;
2866c82d JA	192	}
2866c82d JA	193
2b13e716	194	static int fio_sgio_doio(struct thread_data td, struct io_u io_u, int do_sync)
2866c82d	195	{
53cdc686 JA	196	struct fio_file *f = io_u->file;
53cdc686 JA	197
af52b345	198	if (f->filetype == FIO_TYPE_BD)
53cdc686	199	return fio_sgio_ioctl_doio(td, f, io_u);
2866c82d	200
2b13e716	201	return fio_sgio_rw_doio(f, io_u, do_sync);
2866c82d JA	202	}
2866c82d JA	203
2866c82d JA	204	static int fio_sgio_prep(struct thread_data td, struct io_u io_u)
	205	{
	206	struct sg_io_hdr *hdr = &io_u->hdr;
	207	struct sgio_data *sd = td->io_ops->data;
	208	int nr_blocks, lba;
	209
cec6b55d	210	if (io_u->xfer_buflen & (sd->bs - 1)) {
2866c82d JA	211	log_err("read/write not sector aligned\n");
	212	return EINVAL;
	213	}
	214
2866c82d	215	if (io_u->ddir == DDIR_READ) {
87dc1ab1 JA	216	sgio_hdr_init(sd, hdr, io_u, 1);
87dc1ab1 JA	217
2866c82d JA	218	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
2866c82d JA	219	hdr->cmdp[0] = 0x28;
87dc1ab1 JA	220	} else if (io_u->ddir == DDIR_WRITE) {
	221	sgio_hdr_init(sd, hdr, io_u, 1);
	222
2866c82d JA	223	hdr->dxfer_direction = SG_DXFER_TO_DEV;
2866c82d JA	224	hdr->cmdp[0] = 0x2a;
87dc1ab1 JA	225	} else {
	226	sgio_hdr_init(sd, hdr, io_u, 0);
	227
	228	hdr->dxfer_direction = SG_DXFER_NONE;
	229	hdr->cmdp[0] = 0x35;
	230	}
	231
	232	if (hdr->dxfer_direction != SG_DXFER_NONE) {
cec6b55d	233	nr_blocks = io_u->xfer_buflen / sd->bs;
87dc1ab1	234	lba = io_u->offset / sd->bs;
1e97cce9 JA	235	hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
	236	hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
	237	hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff);
	238	hdr->cmdp[5] = (unsigned char) (lba & 0xff);
	239	hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff);
	240	hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff);
2866c82d JA	241	}
2866c82d JA	242
2866c82d JA	243	return 0;
	244	}
	245
	246	static int fio_sgio_queue(struct thread_data td, struct io_u io_u)
	247	{
	248	struct sg_io_hdr *hdr = &io_u->hdr;
f6db4fa5	249	int ret, do_sync = 0;
2866c82d	250
7101d9c2 JA	251	fio_ro_check(td, io_u);
7101d9c2 JA	252
f6db4fa5 JA	253	if (td->o.sync_io \|\| td->o.odirect \|\| ddir_sync(io_u->ddir))
	254	do_sync = 1;
	255
	256	ret = fio_sgio_doio(td, io_u, do_sync);
2866c82d JA	257
	258	if (ret < 0)
	259	io_u->error = errno;
	260	else if (hdr->status) {
	261	io_u->resid = hdr->resid;
	262	io_u->error = EIO;
	263	}
	264
95bcd815	265	if (io_u->error) {
e1161c32	266	td_verror(td, io_u->error, "xfer");
36167d82	267	return FIO_Q_COMPLETED;
95bcd815 JA	268	}
95bcd815 JA	269
36167d82	270	return ret;
2866c82d JA	271	}
	272
	273	static struct io_u fio_sgio_event(struct thread_data td, int event)
	274	{
	275	struct sgio_data *sd = td->io_ops->data;
	276
	277	return sd->events[event];
	278	}
	279
	280	static int fio_sgio_get_bs(struct thread_data td, unsigned int bs)
	281	{
	282	struct sgio_data *sd = td->io_ops->data;
2039ab1d	283	struct io_u io_u;
2866c82d JA	284	struct sg_io_hdr *hdr;
	285	unsigned char buf[8];
	286	int ret;
	287
2039ab1d JA	288	memset(&io_u, 0, sizeof(io_u));
2039ab1d JA	289	io_u.file = td->files[0];
2866c82d	290
2039ab1d JA	291	hdr = &io_u.hdr;
2039ab1d JA	292	sgio_hdr_init(sd, hdr, &io_u, 0);
2866c82d JA	293	memset(buf, 0, sizeof(buf));
	294
	295	hdr->cmdp[0] = 0x25;
	296	hdr->dxfer_direction = SG_DXFER_FROM_DEV;
	297	hdr->dxferp = buf;
	298	hdr->dxfer_len = sizeof(buf);
	299
2039ab1d JA	300	ret = fio_sgio_doio(td, &io_u, 1);
2039ab1d JA	301	if (ret)
2866c82d	302	return ret;
2866c82d JA	303
2866c82d JA	304	*bs = (buf[4] << 24) \| (buf[5] << 16) \| (buf[6] << 8) \| buf[7];
2866c82d JA	305	return 0;
	306	}
	307
	308	static void fio_sgio_cleanup(struct thread_data *td)
	309	{
dc0deca2 JA	310	struct sgio_data *sd = td->io_ops->data;
	311
	312	if (sd) {
	313	free(sd->events);
	314	free(sd->cmds);
	315	free(sd->fd_flags);
	316	free(sd->pfds);
	317	free(sd->sgbuf);
	318	free(sd);
2866c82d JA	319	}
	320	}
	321
	322	static int fio_sgio_init(struct thread_data *td)
	323	{
	324	struct sgio_data *sd;
2866c82d JA	325
2866c82d JA	326	sd = malloc(sizeof(*sd));
cb781c75	327	memset(sd, 0, sizeof(*sd));
2dc1bbeb JA	328	sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
	329	memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
	330	sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
	331	memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
	332	sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
	333	memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
	334	sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
	335	memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
	336	sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
	337	memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
dc0deca2	338
2866c82d JA	339	td->io_ops->data = sd;
2866c82d JA	340
b5af8293 JA	341	/*
	342	* we want to do it, regardless of whether odirect is set or not
	343	*/
2dc1bbeb	344	td->o.override_sync = 1;
b5af8293 JA	345	return 0;
	346	}
	347
	348	static int fio_sgio_type_check(struct thread_data td, struct fio_file f)
	349	{
	350	struct sgio_data *sd = td->io_ops->data;
	351	unsigned int bs;
	352
af52b345	353	if (f->filetype == FIO_TYPE_BD) {
53cdc686	354	if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
e1161c32	355	td_verror(td, errno, "ioctl");
b5af8293	356	return 1;
2866c82d	357	}
af52b345	358	} else if (f->filetype == FIO_TYPE_CHAR) {
b5af8293	359	int version, ret;
2866c82d	360
53cdc686	361	if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
e1161c32	362	td_verror(td, errno, "ioctl");
b5af8293	363	return 1;
2866c82d JA	364	}
	365
	366	ret = fio_sgio_get_bs(td, &bs);
	367	if (ret)
b5af8293	368	return 1;
2866c82d	369	} else {
d0c70934	370	log_err("ioengine sg only works on block devices\n");
b5af8293	371	return 1;
2866c82d JA	372	}
	373
	374	sd->bs = bs;
	375
af52b345	376	if (f->filetype == FIO_TYPE_BD) {
36167d82 JA	377	td->io_ops->getevents = NULL;
	378	td->io_ops->event = NULL;
	379	}
2866c82d	380
2866c82d	381	return 0;
b5af8293 JA	382	}
	383
	384	static int fio_sgio_open(struct thread_data td, struct fio_file f)
	385	{
	386	struct sgio_data *sd = td->io_ops->data;
	387	int ret;
	388
	389	ret = generic_open_file(td, f);
	390	if (ret)
	391	return ret;
	392
15ba640a	393	if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
6977bcd0	394	ret = generic_close_file(td, f);
b5af8293 JA	395	return 1;
	396	}
	397
	398	return 0;
2866c82d JA	399	}
2866c82d JA	400
5f350952	401	static struct ioengine_ops ioengine = {
2866c82d JA	402	.name = "sg",
	403	.version = FIO_IOOPS_VERSION,
	404	.init = fio_sgio_init,
	405	.prep = fio_sgio_prep,
	406	.queue = fio_sgio_queue,
	407	.getevents = fio_sgio_getevents,
	408	.event = fio_sgio_event,
	409	.cleanup = fio_sgio_cleanup,
b5af8293 JA	410	.open_file = fio_sgio_open,
b5af8293 JA	411	.close_file = generic_close_file,
df9c26b1	412	.get_file_size = generic_get_file_size,
b2a15192	413	.flags = FIO_SYNCIO \| FIO_RAWIO,
2866c82d	414	};
34cfcdaf JA	415
	416	#else /* FIO_HAVE_SGIO */
	417
	418	/*
	419	* When we have a proper configure system in place, we simply wont build
	420	* and install this io engine. For now install a crippled version that
	421	* just complains and fails to load.
	422	*/
	423	static int fio_sgio_init(struct thread_data fio_unused *td)
	424	{
a3edaf76	425	log_err("fio: ioengine sg not available\n");
34cfcdaf JA	426	return 1;
	427	}
	428
5f350952	429	static struct ioengine_ops ioengine = {
d0c70934	430	.name = "sg",
34cfcdaf JA	431	.version = FIO_IOOPS_VERSION,
	432	.init = fio_sgio_init,
	433	};
	434
	435	#endif
5f350952 JA	436
	437	static void fio_init fio_sgio_register(void)
	438	{
	439	register_ioengine(&ioengine);
	440	}
	441
	442	static void fio_exit fio_sgio_unregister(void)
	443	{
	444	unregister_ioengine(&ioengine);
	445	}