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Linux/include/linux/ktime.h

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  1 /*
  2  *  include/linux/ktime.h
  3  *
  4  *  ktime_t - nanosecond-resolution time format.
  5  *
  6  *   Copyright(C) 2005, Thomas Gleixner <tglx@linutronix.de>
  7  *   Copyright(C) 2005, Red Hat, Inc., Ingo Molnar
  8  *
  9  *  data type definitions, declarations, prototypes and macros.
 10  *
 11  *  Started by: Thomas Gleixner and Ingo Molnar
 12  *
 13  *  Credits:
 14  *
 15  *      Roman Zippel provided the ideas and primary code snippets of
 16  *      the ktime_t union and further simplifications of the original
 17  *      code.
 18  *
 19  *  For licencing details see kernel-base/COPYING
 20  */
 21 #ifndef _LINUX_KTIME_H
 22 #define _LINUX_KTIME_H
 23 
 24 #include <linux/time.h>
 25 #include <linux/jiffies.h>
 26 #include <asm/bug.h>
 27 
 28 /* Nanosecond scalar representation for kernel time values */
 29 typedef s64     ktime_t;
 30 
 31 /**
 32  * ktime_set - Set a ktime_t variable from a seconds/nanoseconds value
 33  * @secs:       seconds to set
 34  * @nsecs:      nanoseconds to set
 35  *
 36  * Return: The ktime_t representation of the value.
 37  */
 38 static inline ktime_t ktime_set(const s64 secs, const unsigned long nsecs)
 39 {
 40         if (unlikely(secs >= KTIME_SEC_MAX))
 41                 return KTIME_MAX;
 42 
 43         return secs * NSEC_PER_SEC + (s64)nsecs;
 44 }
 45 
 46 /* Subtract two ktime_t variables. rem = lhs -rhs: */
 47 #define ktime_sub(lhs, rhs)     ((lhs) - (rhs))
 48 
 49 /* Add two ktime_t variables. res = lhs + rhs: */
 50 #define ktime_add(lhs, rhs)     ((lhs) + (rhs))
 51 
 52 /*
 53  * Same as ktime_add(), but avoids undefined behaviour on overflow; however,
 54  * this means that you must check the result for overflow yourself.
 55  */
 56 #define ktime_add_unsafe(lhs, rhs)      ((u64) (lhs) + (rhs))
 57 
 58 /*
 59  * Add a ktime_t variable and a scalar nanosecond value.
 60  * res = kt + nsval:
 61  */
 62 #define ktime_add_ns(kt, nsval)         ((kt) + (nsval))
 63 
 64 /*
 65  * Subtract a scalar nanosecod from a ktime_t variable
 66  * res = kt - nsval:
 67  */
 68 #define ktime_sub_ns(kt, nsval)         ((kt) - (nsval))
 69 
 70 /* convert a timespec64 to ktime_t format: */
 71 static inline ktime_t timespec64_to_ktime(struct timespec64 ts)
 72 {
 73         return ktime_set(ts.tv_sec, ts.tv_nsec);
 74 }
 75 
 76 /* Map the ktime_t to timespec conversion to ns_to_timespec function */
 77 #define ktime_to_timespec64(kt)         ns_to_timespec64((kt))
 78 
 79 /* Convert ktime_t to nanoseconds */
 80 static inline s64 ktime_to_ns(const ktime_t kt)
 81 {
 82         return kt;
 83 }
 84 
 85 /**
 86  * ktime_compare - Compares two ktime_t variables for less, greater or equal
 87  * @cmp1:       comparable1
 88  * @cmp2:       comparable2
 89  *
 90  * Return: ...
 91  *   cmp1  < cmp2: return <0
 92  *   cmp1 == cmp2: return 0
 93  *   cmp1  > cmp2: return >0
 94  */
 95 static inline int ktime_compare(const ktime_t cmp1, const ktime_t cmp2)
 96 {
 97         if (cmp1 < cmp2)
 98                 return -1;
 99         if (cmp1 > cmp2)
100                 return 1;
101         return 0;
102 }
103 
104 /**
105  * ktime_after - Compare if a ktime_t value is bigger than another one.
106  * @cmp1:       comparable1
107  * @cmp2:       comparable2
108  *
109  * Return: true if cmp1 happened after cmp2.
110  */
111 static inline bool ktime_after(const ktime_t cmp1, const ktime_t cmp2)
112 {
113         return ktime_compare(cmp1, cmp2) > 0;
114 }
115 
116 /**
117  * ktime_before - Compare if a ktime_t value is smaller than another one.
118  * @cmp1:       comparable1
119  * @cmp2:       comparable2
120  *
121  * Return: true if cmp1 happened before cmp2.
122  */
123 static inline bool ktime_before(const ktime_t cmp1, const ktime_t cmp2)
124 {
125         return ktime_compare(cmp1, cmp2) < 0;
126 }
127 
128 #if BITS_PER_LONG < 64
129 extern s64 __ktime_divns(const ktime_t kt, s64 div);
130 static inline s64 ktime_divns(const ktime_t kt, s64 div)
131 {
132         /*
133          * Negative divisors could cause an inf loop,
134          * so bug out here.
135          */
136         BUG_ON(div < 0);
137         if (__builtin_constant_p(div) && !(div >> 32)) {
138                 s64 ns = kt;
139                 u64 tmp = ns < 0 ? -ns : ns;
140 
141                 do_div(tmp, div);
142                 return ns < 0 ? -tmp : tmp;
143         } else {
144                 return __ktime_divns(kt, div);
145         }
146 }
147 #else /* BITS_PER_LONG < 64 */
148 static inline s64 ktime_divns(const ktime_t kt, s64 div)
149 {
150         /*
151          * 32-bit implementation cannot handle negative divisors,
152          * so catch them on 64bit as well.
153          */
154         WARN_ON(div < 0);
155         return kt / div;
156 }
157 #endif
158 
159 static inline s64 ktime_to_us(const ktime_t kt)
160 {
161         return ktime_divns(kt, NSEC_PER_USEC);
162 }
163 
164 static inline s64 ktime_to_ms(const ktime_t kt)
165 {
166         return ktime_divns(kt, NSEC_PER_MSEC);
167 }
168 
169 static inline s64 ktime_us_delta(const ktime_t later, const ktime_t earlier)
170 {
171        return ktime_to_us(ktime_sub(later, earlier));
172 }
173 
174 static inline s64 ktime_ms_delta(const ktime_t later, const ktime_t earlier)
175 {
176         return ktime_to_ms(ktime_sub(later, earlier));
177 }
178 
179 static inline ktime_t ktime_add_us(const ktime_t kt, const u64 usec)
180 {
181         return ktime_add_ns(kt, usec * NSEC_PER_USEC);
182 }
183 
184 static inline ktime_t ktime_add_ms(const ktime_t kt, const u64 msec)
185 {
186         return ktime_add_ns(kt, msec * NSEC_PER_MSEC);
187 }
188 
189 static inline ktime_t ktime_sub_us(const ktime_t kt, const u64 usec)
190 {
191         return ktime_sub_ns(kt, usec * NSEC_PER_USEC);
192 }
193 
194 static inline ktime_t ktime_sub_ms(const ktime_t kt, const u64 msec)
195 {
196         return ktime_sub_ns(kt, msec * NSEC_PER_MSEC);
197 }
198 
199 extern ktime_t ktime_add_safe(const ktime_t lhs, const ktime_t rhs);
200 
201 /**
202  * ktime_to_timespec64_cond - convert a ktime_t variable to timespec64
203  *                          format only if the variable contains data
204  * @kt:         the ktime_t variable to convert
205  * @ts:         the timespec variable to store the result in
206  *
207  * Return: %true if there was a successful conversion, %false if kt was 0.
208  */
209 static inline __must_check bool ktime_to_timespec64_cond(const ktime_t kt,
210                                                        struct timespec64 *ts)
211 {
212         if (kt) {
213                 *ts = ktime_to_timespec64(kt);
214                 return true;
215         } else {
216                 return false;
217         }
218 }
219 
220 #include <vdso/ktime.h>
221 
222 static inline ktime_t ns_to_ktime(u64 ns)
223 {
224         return ns;
225 }
226 
227 static inline ktime_t ms_to_ktime(u64 ms)
228 {
229         return ms * NSEC_PER_MSEC;
230 }
231 
232 # include <linux/timekeeping.h>
233 # include <linux/timekeeping32.h>
234 
235 #endif
236 

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