summaryrefslogtreecommitdiff
path: root/engines/libpmem.c
blob: ab29a45383b5fe70ccb9a7334cbb3cf14472b78b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 * libpmem: IO engine that uses PMDK libpmem to read and write data
 *
 * Copyright (C) 2017 Nippon Telegraph and Telephone Corporation.
 * Copyright 2018-2021, Intel Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License,
 * version 2 as published by the Free Software Foundation..
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 */

/*
 * libpmem engine
 *
 * IO engine that uses libpmem (part of PMDK collection) to write data
 *	and libc's memcpy to read. It requires PMDK >= 1.5.
 *
 * To use:
 *   ioengine=libpmem
 *
 * Other relevant settings:
 *   iodepth=1
 *   direct=1
 *   sync=1
 *   directory=/mnt/pmem0/
 *   bs=4k
 *
 *   sync=1 means that pmem_drain() is executed for each write operation.
 *   Otherwise is not and should be called on demand.
 *
 *   direct=1 means PMEM_F_MEM_NONTEMPORAL flag is set in pmem_memcpy().
 *
 *   The pmem device must have a DAX-capable filesystem and be mounted
 *   with DAX enabled. Directory must point to a mount point of DAX FS.
 *
 *   Example:
 *     mkfs.xfs /dev/pmem0
 *     mkdir /mnt/pmem0
 *     mount -o dax /dev/pmem0 /mnt/pmem0
 *
 * See examples/libpmem.fio for complete usage example.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <libpmem.h>

#include "../fio.h"
#include "../verify.h"

struct fio_libpmem_data {
	void *libpmem_ptr;
	size_t libpmem_sz;
	off_t libpmem_off;
};

static int fio_libpmem_init(struct thread_data *td)
{
	struct thread_options *o = &td->o;

	dprint(FD_IO, "o->rw_min_bs %llu\n o->fsync_blocks %u\n o->fdatasync_blocks %u\n",
			o->rw_min_bs, o->fsync_blocks, o->fdatasync_blocks);
	dprint(FD_IO, "DEBUG fio_libpmem_init\n");

	if ((o->rw_min_bs & page_mask) &&
	    (o->fsync_blocks || o->fdatasync_blocks)) {
		log_err("libpmem: mmap options dictate a minimum block size of "
				"%llu bytes\n",	(unsigned long long) page_size);
		return 1;
	}
	return 0;
}

/*
 * This is the pmem_map_file execution function, a helper to
 * fio_libpmem_open_file function.
 */
static int fio_libpmem_file(struct thread_data *td, struct fio_file *f,
			    size_t length, off_t off)
{
	struct fio_libpmem_data *fdd = FILE_ENG_DATA(f);
	mode_t mode = S_IWUSR | S_IRUSR;
	size_t mapped_len;
	int is_pmem;

	dprint(FD_IO, "DEBUG fio_libpmem_file\n");
	dprint(FD_IO, "f->file_name = %s td->o.verify = %d \n", f->file_name,
			td->o.verify);
	dprint(FD_IO, "length = %ld f->fd = %d off = %ld file mode = %d \n",
			length, f->fd, off, mode);

	/* unmap any existing mapping */
	if (fdd->libpmem_ptr) {
		dprint(FD_IO,"pmem_unmap \n");
		if (pmem_unmap(fdd->libpmem_ptr, fdd->libpmem_sz) < 0)
			return errno;
		fdd->libpmem_ptr = NULL;
	}

	if((fdd->libpmem_ptr = pmem_map_file(f->file_name, length, PMEM_FILE_CREATE, mode, &mapped_len, &is_pmem)) == NULL) {
		td_verror(td, errno, pmem_errormsg());
		goto err;
	}

	if (!is_pmem) {
		td_verror(td, errno, "file_name does not point to persistent memory");
	}

err:
	if (td->error && fdd->libpmem_ptr)
		pmem_unmap(fdd->libpmem_ptr, length);

	return td->error;
}

static int fio_libpmem_open_file(struct thread_data *td, struct fio_file *f)
{
	struct fio_libpmem_data *fdd;

	dprint(FD_IO, "DEBUG fio_libpmem_open_file\n");
	dprint(FD_IO, "f->io_size=%ld\n", f->io_size);
	dprint(FD_IO, "td->o.size=%lld\n", td->o.size);
	dprint(FD_IO, "td->o.iodepth=%d\n", td->o.iodepth);
	dprint(FD_IO, "td->o.iodepth_batch=%d\n", td->o.iodepth_batch);

	if (fio_file_open(f))
		td_io_close_file(td, f);

	fdd = calloc(1, sizeof(*fdd));
	if (!fdd) {
		return 1;
	}
	FILE_SET_ENG_DATA(f, fdd);
	fdd->libpmem_sz = f->io_size;
	fdd->libpmem_off = 0;

	return fio_libpmem_file(td, f, fdd->libpmem_sz, fdd->libpmem_off);
}

static int fio_libpmem_prep(struct thread_data *td, struct io_u *io_u)
{
	struct fio_file *f = io_u->file;
	struct fio_libpmem_data *fdd = FILE_ENG_DATA(f);

	dprint(FD_IO, "DEBUG fio_libpmem_prep\n");
	dprint(FD_IO, "io_u->offset %llu : fdd->libpmem_off %ld : "
			"io_u->buflen %llu : fdd->libpmem_sz %ld\n",
			io_u->offset, fdd->libpmem_off,
			io_u->buflen, fdd->libpmem_sz);

	if (io_u->buflen > f->real_file_size) {
		log_err("libpmem: bs bigger than the file size\n");
		return EIO;
	}

	io_u->mmap_data = fdd->libpmem_ptr + io_u->offset - fdd->libpmem_off
				- f->file_offset;
	return 0;
}

static enum fio_q_status fio_libpmem_queue(struct thread_data *td,
					   struct io_u *io_u)
{
	unsigned flags = 0;

	fio_ro_check(td, io_u);
	io_u->error = 0;

	dprint(FD_IO, "DEBUG fio_libpmem_queue\n");
	dprint(FD_IO, "td->o.odirect %d td->o.sync_io %d\n",
			td->o.odirect, td->o.sync_io);
	/* map both O_SYNC / DSYNC to not use NODRAIN */
	flags = td->o.sync_io ? 0 : PMEM_F_MEM_NODRAIN;
	flags |= td->o.odirect ? PMEM_F_MEM_NONTEMPORAL : PMEM_F_MEM_TEMPORAL;

	switch (io_u->ddir) {
	case DDIR_READ:
		memcpy(io_u->xfer_buf, io_u->mmap_data, io_u->xfer_buflen);
		break;
	case DDIR_WRITE:
		dprint(FD_IO, "DEBUG mmap_data=%p, xfer_buf=%p\n",
				io_u->mmap_data, io_u->xfer_buf);
		pmem_memcpy(io_u->mmap_data,
					io_u->xfer_buf,
					io_u->xfer_buflen,
					flags);
		break;
	case DDIR_SYNC:
	case DDIR_DATASYNC:
	case DDIR_SYNC_FILE_RANGE:
		pmem_drain();
		break;
	default:
		io_u->error = EINVAL;
		break;
	}

	return FIO_Q_COMPLETED;
}

static int fio_libpmem_close_file(struct thread_data *td, struct fio_file *f)
{
	struct fio_libpmem_data *fdd = FILE_ENG_DATA(f);
	int ret = 0;

	dprint(FD_IO, "DEBUG fio_libpmem_close_file\n");

	if (fdd->libpmem_ptr)
		ret = pmem_unmap(fdd->libpmem_ptr, fdd->libpmem_sz);
	if (fio_file_open(f))
		ret &= generic_close_file(td, f);

	FILE_SET_ENG_DATA(f, NULL);
	free(fdd);

	return ret;
}

FIO_STATIC struct ioengine_ops ioengine = {
	.name		= "libpmem",
	.version	= FIO_IOOPS_VERSION,
	.init		= fio_libpmem_init,
	.prep		= fio_libpmem_prep,
	.queue		= fio_libpmem_queue,
	.open_file	= fio_libpmem_open_file,
	.close_file	= fio_libpmem_close_file,
	.get_file_size	= generic_get_file_size,
	.prepopulate_file = generic_prepopulate_file,
	.flags		= FIO_SYNCIO | FIO_RAWIO | FIO_DISKLESSIO | FIO_NOEXTEND |
				FIO_NODISKUTIL | FIO_BARRIER | FIO_MEMALIGN,
};

static void fio_init fio_libpmem_register(void)
{
	register_ioengine(&ioengine);
}

static void fio_exit fio_libpmem_unregister(void)
{
	unregister_ioengine(&ioengine);
}