1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef KUBLK_UTILS_H
3 #define KUBLK_UTILS_H
4
5 #define __maybe_unused __attribute__((unused))
6
7 #ifndef min
8 #define min(a, b) ((a) < (b) ? (a) : (b))
9 #endif
10
11 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
12
13 #ifndef offsetof
14 #define offsetof(TYPE, MEMBER) ((size_t)&((TYPE *)0)->MEMBER)
15 #endif
16
17 #ifndef container_of
18 #define container_of(ptr, type, member) ({ \
19 unsigned long __mptr = (unsigned long)(ptr); \
20 ((type *)(__mptr - offsetof(type, member))); })
21 #endif
22
23 #define round_up(val, rnd) \
24 (((val) + ((rnd) - 1)) & ~((rnd) - 1))
25
ilog2(unsigned int x)26 static inline unsigned int ilog2(unsigned int x)
27 {
28 if (x == 0)
29 return 0;
30 return (sizeof(x) * 8 - 1) - __builtin_clz(x);
31 }
32
33 #define UBLK_DBG_DEV (1U << 0)
34 #define UBLK_DBG_THREAD (1U << 1)
35 #define UBLK_DBG_IO_CMD (1U << 2)
36 #define UBLK_DBG_IO (1U << 3)
37 #define UBLK_DBG_CTRL_CMD (1U << 4)
38 #define UBLK_LOG (1U << 5)
39
40 extern unsigned int ublk_dbg_mask;
41
ublk_err(const char * fmt,...)42 static inline void ublk_err(const char *fmt, ...)
43 {
44 va_list ap;
45
46 va_start(ap, fmt);
47 vfprintf(stderr, fmt, ap);
48 }
49
ublk_log(const char * fmt,...)50 static inline void ublk_log(const char *fmt, ...)
51 {
52 if (ublk_dbg_mask & UBLK_LOG) {
53 va_list ap;
54
55 va_start(ap, fmt);
56 vfprintf(stdout, fmt, ap);
57 }
58 }
59
ublk_dbg(int level,const char * fmt,...)60 static inline void ublk_dbg(int level, const char *fmt, ...)
61 {
62 if (level & ublk_dbg_mask) {
63 va_list ap;
64
65 va_start(ap, fmt);
66 vfprintf(stdout, fmt, ap);
67 }
68 }
69
70 #endif
71