os-linux.h revision a1c58075279454a91ec43366846b93e8dcf9753c 
1#ifndef FIO_OS_LINUX_H
2#define FIO_OS_LINUX_H
3
4#include <sys/ioctl.h>
5#include <sys/uio.h>
6#include <sys/syscall.h>
7#include <unistd.h>
8#include <fcntl.h>
9#include <errno.h>
10#include <linux/unistd.h>
11#include <linux/raw.h>
12#include <linux/major.h>
13
14#include "indirect.h"
15
16#define FIO_HAVE_LIBAIO
17#define FIO_HAVE_POSIXAIO
18#define FIO_HAVE_FADVISE
19#define FIO_HAVE_CPU_AFFINITY
20#define FIO_HAVE_DISK_UTIL
21#define FIO_HAVE_SGIO
22#define FIO_HAVE_IOPRIO
23#define FIO_HAVE_SPLICE
24#define FIO_HAVE_IOSCHED_SWITCH
25#define FIO_HAVE_ODIRECT
26#define FIO_HAVE_HUGETLB
27#define FIO_HAVE_RAWBIND
28#define FIO_HAVE_BLKTRACE
29#define FIO_HAVE_STRSEP
30#define FIO_HAVE_FALLOCATE
31#define FIO_HAVE_POSIXAIO_FSYNC
32#define FIO_HAVE_PSHARED_MUTEX
33#define FIO_HAVE_CL_SIZE
34
35#define OS_MAP_ANON		MAP_ANONYMOUS
36
37#ifndef CLOCK_MONOTONIC
38#define CLOCK_MONOTONIC 1
39#endif
40
41typedef cpu_set_t os_cpu_mask_t;
42
43typedef struct drand48_data os_random_state_t;
44
45/*
46 * we want fadvise64 really, but it's so tangled... later
47 */
48#ifdef FIO_HAVE_FADVISE
49#define fadvise(fd, off, len, advice)	\
50	posix_fadvise((fd), (off_t)(off), (len), (advice))
51#endif
52
53/*
54 * If you are on an ancient glibc (2.3.2), then define GLIBC_2_3_2 if you want
55 * the affinity helpers to work.
56 */
57#ifndef GLIBC_2_3_2
58#define fio_setaffinity(pid, cpumask)		\
59	sched_setaffinity((pid), sizeof(cpumask), &(cpumask))
60#define fio_getaffinity(pid, ptr)	\
61	sched_getaffinity((pid), sizeof(cpu_set_t), (ptr))
62#else
63#define fio_setaffinity(pid, cpumask)	\
64	sched_setaffinity((pid), &(cpumask))
65#define fio_getaffinity(pid, ptr)	\
66	sched_getaffinity((pid), (ptr))
67#endif
68
69#define fio_cpu_clear(mask, cpu)	CPU_CLR((cpu), (mask))
70#define fio_cpu_set(mask, cpu)		CPU_SET((cpu), (mask))
71
72static inline int fio_cpuset_init(os_cpu_mask_t *mask)
73{
74	CPU_ZERO(mask);
75	return 0;
76}
77
78static inline int fio_cpuset_exit(os_cpu_mask_t *mask)
79{
80	return 0;
81}
82
83#define FIO_MAX_CPUS			CPU_SETSIZE
84
85static inline int ioprio_set(int which, int who, int ioprio)
86{
87	return syscall(__NR_ioprio_set, which, who, ioprio);
88}
89
90/*
91 * Just check for SPLICE_F_MOVE, if that isn't there, assume the others
92 * aren't either.
93 */
94#ifndef SPLICE_F_MOVE
95#define SPLICE_F_MOVE	(0x01)	/* move pages instead of copying */
96#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */
97				 /* we may still block on the fd we splice */
98				 /* from/to, of course */
99#define SPLICE_F_MORE	(0x04)	/* expect more data */
100#define SPLICE_F_GIFT   (0x08)  /* pages passed in are a gift */
101
102static inline int splice(int fdin, loff_t *off_in, int fdout, loff_t *off_out,
103			 size_t len, unsigned int flags)
104{
105	return syscall(__NR_sys_splice, fdin, off_in, fdout, off_out, len, flags);
106}
107
108static inline int tee(int fdin, int fdout, size_t len, unsigned int flags)
109{
110	return syscall(__NR_sys_tee, fdin, fdout, len, flags);
111}
112
113static inline int vmsplice(int fd, const struct iovec *iov,
114			   unsigned long nr_segs, unsigned int flags)
115{
116	return syscall(__NR_sys_vmsplice, fd, iov, nr_segs, flags);
117}
118#endif
119
120#define SPLICE_DEF_SIZE	(64*1024)
121
122#ifdef FIO_HAVE_SYSLET
123
124struct syslet_uatom;
125struct async_head_user;
126
127/*
128 * syslet stuff
129 */
130static inline struct syslet_uatom *
131async_exec(struct syslet_uatom *atom, struct async_head_user *ahu)
132{
133	return (struct syslet_uatom *) syscall(__NR_async_exec, atom, ahu);
134}
135
136static inline long
137async_wait(unsigned long min_wait_events, unsigned long user_ring_idx,
138	   struct async_head_user *ahu)
139{
140	return syscall(__NR_async_wait, min_wait_events,
141			user_ring_idx, ahu);
142}
143
144static inline long async_thread(void *event, struct async_head_user *ahu)
145{
146	return syscall(__NR_async_thread, event, ahu);
147}
148
149static inline long umem_add(unsigned long *uptr, unsigned long inc)
150{
151	return syscall(__NR_umem_add, uptr, inc);
152}
153#endif /* FIO_HAVE_SYSLET */
154
155enum {
156	IOPRIO_CLASS_NONE,
157	IOPRIO_CLASS_RT,
158	IOPRIO_CLASS_BE,
159	IOPRIO_CLASS_IDLE,
160};
161
162enum {
163	IOPRIO_WHO_PROCESS = 1,
164	IOPRIO_WHO_PGRP,
165	IOPRIO_WHO_USER,
166};
167
168#define IOPRIO_BITS		16
169#define IOPRIO_CLASS_SHIFT	13
170
171#ifndef BLKGETSIZE64
172#define BLKGETSIZE64	_IOR(0x12,114,size_t)
173#endif
174
175#ifndef BLKFLSBUF
176#define BLKFLSBUF	_IO(0x12,97)
177#endif
178
179static inline int blockdev_invalidate_cache(int fd)
180{
181	return ioctl(fd, BLKFLSBUF);
182}
183
184static inline int blockdev_size(int fd, unsigned long long *bytes)
185{
186	if (!ioctl(fd, BLKGETSIZE64, bytes))
187		return 0;
188
189	return errno;
190}
191
192static inline unsigned long long os_phys_mem(void)
193{
194	long pagesize, pages;
195
196	pagesize = sysconf(_SC_PAGESIZE);
197	pages = sysconf(_SC_PHYS_PAGES);
198	if (pages == -1 || pagesize == -1)
199		return 0;
200
201	return (unsigned long long) pages * (unsigned long long) pagesize;
202}
203
204static inline void os_random_seed(unsigned long seed, os_random_state_t *rs)
205{
206	srand48_r(seed, rs);
207}
208
209static inline long os_random_long(os_random_state_t *rs)
210{
211	long val;
212
213	lrand48_r(rs, &val);
214	return val;
215}
216
217static inline int fio_lookup_raw(dev_t dev, int *majdev, int *mindev)
218{
219	struct raw_config_request rq;
220	int fd;
221
222	if (major(dev) != RAW_MAJOR)
223		return 1;
224
225	/*
226	 * we should be able to find /dev/rawctl or /dev/raw/rawctl
227	 */
228	fd = open("/dev/rawctl", O_RDONLY);
229	if (fd < 0) {
230		fd = open("/dev/raw/rawctl", O_RDONLY);
231		if (fd < 0)
232			return 1;
233	}
234
235	rq.raw_minor = minor(dev);
236	if (ioctl(fd, RAW_GETBIND, &rq) < 0) {
237		close(fd);
238		return 1;
239	}
240
241	close(fd);
242	*majdev = rq.block_major;
243	*mindev = rq.block_minor;
244	return 0;
245}
246
247#ifdef O_NOATIME
248#define FIO_O_NOATIME	O_NOATIME
249#else
250#define FIO_O_NOATIME	0
251#endif
252
253#ifdef MADV_REMOVE
254#define FIO_MADV_FREE	MADV_REMOVE
255#endif
256
257#define CACHE_LINE_FILE	\
258	"/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size"
259
260static inline int arch_cache_line_size(void)
261{
262	char size[32];
263	int fd, ret;
264
265	fd = open(CACHE_LINE_FILE, O_RDONLY);
266	if (fd < 0)
267		return -1;
268
269	ret = read(fd, size, sizeof(size));
270
271	close(fd);
272
273	if (ret <= 0)
274		return -1;
275	else
276		return atoi(size);
277}
278
279#endif
280