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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic userspace implementations of gettimeofday() and similar.
4 */
5#include <vdso/datapage.h>
6#include <vdso/helpers.h>
7
8#ifndef vdso_calc_ns
9
10#ifdef VDSO_DELTA_NOMASK
11# define VDSO_DELTA_MASK(vd) ULLONG_MAX
12#else
13# define VDSO_DELTA_MASK(vd) (vd->mask)
14#endif
15
16#ifdef CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
17static __always_inline bool vdso_delta_ok(const struct vdso_data *vd, u64 delta)
18{
19 return delta < vd->max_cycles;
20}
21#else
22static __always_inline bool vdso_delta_ok(const struct vdso_data *vd, u64 delta)
23{
24 return true;
25}
26#endif
27
28#ifndef vdso_shift_ns
29static __always_inline u64 vdso_shift_ns(u64 ns, u32 shift)
30{
31 return ns >> shift;
32}
33#endif
34
35/*
36 * Default implementation which works for all sane clocksources. That
37 * obviously excludes x86/TSC.
38 */
39static __always_inline u64 vdso_calc_ns(const struct vdso_data *vd, u64 cycles, u64 base)
40{
41 u64 delta = (cycles - vd->cycle_last) & VDSO_DELTA_MASK(vd);
42
43 if (likely(vdso_delta_ok(vd, delta)))
44 return vdso_shift_ns((delta * vd->mult) + base, vd->shift);
45
46 return mul_u64_u32_add_u64_shr(delta, vd->mult, base, vd->shift);
47}
48#endif /* vdso_calc_ns */
49
50#ifndef __arch_vdso_hres_capable
51static inline bool __arch_vdso_hres_capable(void)
52{
53 return true;
54}
55#endif
56
57#ifndef vdso_clocksource_ok
58static inline bool vdso_clocksource_ok(const struct vdso_data *vd)
59{
60 return vd->clock_mode != VDSO_CLOCKMODE_NONE;
61}
62#endif
63
64#ifndef vdso_cycles_ok
65static inline bool vdso_cycles_ok(u64 cycles)
66{
67 return true;
68}
69#endif
70
71#ifdef CONFIG_TIME_NS
72static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
73 struct __kernel_timespec *ts)
74{
75 const struct timens_offset *offs = &vdns->offset[clk];
76 const struct vdso_timestamp *vdso_ts;
77 const struct vdso_data *vd;
78 u64 cycles, ns;
79 u32 seq;
80 s64 sec;
81
82 vd = vdns - (clk == CLOCK_MONOTONIC_RAW ? CS_RAW : CS_HRES_COARSE);
83 vd = __arch_get_timens_vdso_data(vd);
84 if (clk != CLOCK_MONOTONIC_RAW)
85 vd = &vd[CS_HRES_COARSE];
86 else
87 vd = &vd[CS_RAW];
88 vdso_ts = &vd->basetime[clk];
89
90 do {
91 seq = vdso_read_begin(vd);
92
93 if (unlikely(!vdso_clocksource_ok(vd)))
94 return -1;
95
96 cycles = __arch_get_hw_counter(vd->clock_mode, vd);
97 if (unlikely(!vdso_cycles_ok(cycles)))
98 return -1;
99 ns = vdso_calc_ns(vd, cycles, vdso_ts->nsec);
100 sec = vdso_ts->sec;
101 } while (unlikely(vdso_read_retry(vd, seq)));
102
103 /* Add the namespace offset */
104 sec += offs->sec;
105 ns += offs->nsec;
106
107 /*
108 * Do this outside the loop: a race inside the loop could result
109 * in __iter_div_u64_rem() being extremely slow.
110 */
111 ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
112 ts->tv_nsec = ns;
113
114 return 0;
115}
116#else
117static __always_inline
118const struct vdso_data *__arch_get_timens_vdso_data(const struct vdso_data *vd)
119{
120 return NULL;
121}
122
123static __always_inline int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
124 struct __kernel_timespec *ts)
125{
126 return -EINVAL;
127}
128#endif
129
130static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
131 struct __kernel_timespec *ts)
132{
133 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
134 u64 cycles, sec, ns;
135 u32 seq;
136
137 /* Allows to compile the high resolution parts out */
138 if (!__arch_vdso_hres_capable())
139 return -1;
140
141 do {
142 /*
143 * Open coded function vdso_read_begin() to handle
144 * VDSO_CLOCKMODE_TIMENS. Time namespace enabled tasks have a
145 * special VVAR page installed which has vd->seq set to 1 and
146 * vd->clock_mode set to VDSO_CLOCKMODE_TIMENS. For non time
147 * namespace affected tasks this does not affect performance
148 * because if vd->seq is odd, i.e. a concurrent update is in
149 * progress the extra check for vd->clock_mode is just a few
150 * extra instructions while spin waiting for vd->seq to become
151 * even again.
152 */
153 while (unlikely((seq = READ_ONCE(vd->seq)) & 1)) {
154 if (IS_ENABLED(CONFIG_TIME_NS) &&
155 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
156 return do_hres_timens(vd, clk, ts);
157 cpu_relax();
158 }
159 smp_rmb();
160
161 if (unlikely(!vdso_clocksource_ok(vd)))
162 return -1;
163
164 cycles = __arch_get_hw_counter(vd->clock_mode, vd);
165 if (unlikely(!vdso_cycles_ok(cycles)))
166 return -1;
167 ns = vdso_calc_ns(vd, cycles, vdso_ts->nsec);
168 sec = vdso_ts->sec;
169 } while (unlikely(vdso_read_retry(vd, seq)));
170
171 /*
172 * Do this outside the loop: a race inside the loop could result
173 * in __iter_div_u64_rem() being extremely slow.
174 */
175 ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
176 ts->tv_nsec = ns;
177
178 return 0;
179}
180
181#ifdef CONFIG_TIME_NS
182static __always_inline int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
183 struct __kernel_timespec *ts)
184{
185 const struct vdso_data *vd = __arch_get_timens_vdso_data(vdns);
186 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
187 const struct timens_offset *offs = &vdns->offset[clk];
188 u64 nsec;
189 s64 sec;
190 s32 seq;
191
192 do {
193 seq = vdso_read_begin(vd);
194 sec = vdso_ts->sec;
195 nsec = vdso_ts->nsec;
196 } while (unlikely(vdso_read_retry(vd, seq)));
197
198 /* Add the namespace offset */
199 sec += offs->sec;
200 nsec += offs->nsec;
201
202 /*
203 * Do this outside the loop: a race inside the loop could result
204 * in __iter_div_u64_rem() being extremely slow.
205 */
206 ts->tv_sec = sec + __iter_div_u64_rem(nsec, NSEC_PER_SEC, &nsec);
207 ts->tv_nsec = nsec;
208 return 0;
209}
210#else
211static __always_inline int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
212 struct __kernel_timespec *ts)
213{
214 return -1;
215}
216#endif
217
218static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk,
219 struct __kernel_timespec *ts)
220{
221 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
222 u32 seq;
223
224 do {
225 /*
226 * Open coded function vdso_read_begin() to handle
227 * VDSO_CLOCK_TIMENS. See comment in do_hres().
228 */
229 while ((seq = READ_ONCE(vd->seq)) & 1) {
230 if (IS_ENABLED(CONFIG_TIME_NS) &&
231 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
232 return do_coarse_timens(vd, clk, ts);
233 cpu_relax();
234 }
235 smp_rmb();
236
237 ts->tv_sec = vdso_ts->sec;
238 ts->tv_nsec = vdso_ts->nsec;
239 } while (unlikely(vdso_read_retry(vd, seq)));
240
241 return 0;
242}
243
244static __always_inline int
245__cvdso_clock_gettime_common(const struct vdso_data *vd, clockid_t clock,
246 struct __kernel_timespec *ts)
247{
248 u32 msk;
249
250 /* Check for negative values or invalid clocks */
251 if (unlikely((u32) clock >= MAX_CLOCKS))
252 return -1;
253
254 /*
255 * Convert the clockid to a bitmask and use it to check which
256 * clocks are handled in the VDSO directly.
257 */
258 msk = 1U << clock;
259 if (likely(msk & VDSO_HRES))
260 vd = &vd[CS_HRES_COARSE];
261 else if (msk & VDSO_COARSE)
262 return do_coarse(&vd[CS_HRES_COARSE], clock, ts);
263 else if (msk & VDSO_RAW)
264 vd = &vd[CS_RAW];
265 else
266 return -1;
267
268 return do_hres(vd, clock, ts);
269}
270
271static __maybe_unused int
272__cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock,
273 struct __kernel_timespec *ts)
274{
275 int ret = __cvdso_clock_gettime_common(vd, clock, ts);
276
277 if (unlikely(ret))
278 return clock_gettime_fallback(clock, ts);
279 return 0;
280}
281
282static __maybe_unused int
283__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
284{
285 return __cvdso_clock_gettime_data(__arch_get_vdso_data(), clock, ts);
286}
287
288#ifdef BUILD_VDSO32
289static __maybe_unused int
290__cvdso_clock_gettime32_data(const struct vdso_data *vd, clockid_t clock,
291 struct old_timespec32 *res)
292{
293 struct __kernel_timespec ts;
294 int ret;
295
296 ret = __cvdso_clock_gettime_common(vd, clock, &ts);
297
298 if (unlikely(ret))
299 return clock_gettime32_fallback(clock, res);
300
301 /* For ret == 0 */
302 res->tv_sec = ts.tv_sec;
303 res->tv_nsec = ts.tv_nsec;
304
305 return ret;
306}
307
308static __maybe_unused int
309__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
310{
311 return __cvdso_clock_gettime32_data(__arch_get_vdso_data(), clock, res);
312}
313#endif /* BUILD_VDSO32 */
314
315static __maybe_unused int
316__cvdso_gettimeofday_data(const struct vdso_data *vd,
317 struct __kernel_old_timeval *tv, struct timezone *tz)
318{
319
320 if (likely(tv != NULL)) {
321 struct __kernel_timespec ts;
322
323 if (do_hres(&vd[CS_HRES_COARSE], CLOCK_REALTIME, &ts))
324 return gettimeofday_fallback(tv, tz);
325
326 tv->tv_sec = ts.tv_sec;
327 tv->tv_usec = (u32)ts.tv_nsec / NSEC_PER_USEC;
328 }
329
330 if (unlikely(tz != NULL)) {
331 if (IS_ENABLED(CONFIG_TIME_NS) &&
332 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
333 vd = __arch_get_timens_vdso_data(vd);
334
335 tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
336 tz->tz_dsttime = vd[CS_HRES_COARSE].tz_dsttime;
337 }
338
339 return 0;
340}
341
342static __maybe_unused int
343__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
344{
345 return __cvdso_gettimeofday_data(__arch_get_vdso_data(), tv, tz);
346}
347
348#ifdef VDSO_HAS_TIME
349static __maybe_unused __kernel_old_time_t
350__cvdso_time_data(const struct vdso_data *vd, __kernel_old_time_t *time)
351{
352 __kernel_old_time_t t;
353
354 if (IS_ENABLED(CONFIG_TIME_NS) &&
355 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
356 vd = __arch_get_timens_vdso_data(vd);
357
358 t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
359
360 if (time)
361 *time = t;
362
363 return t;
364}
365
366static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time)
367{
368 return __cvdso_time_data(__arch_get_vdso_data(), time);
369}
370#endif /* VDSO_HAS_TIME */
371
372#ifdef VDSO_HAS_CLOCK_GETRES
373static __maybe_unused
374int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock,
375 struct __kernel_timespec *res)
376{
377 u32 msk;
378 u64 ns;
379
380 /* Check for negative values or invalid clocks */
381 if (unlikely((u32) clock >= MAX_CLOCKS))
382 return -1;
383
384 if (IS_ENABLED(CONFIG_TIME_NS) &&
385 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
386 vd = __arch_get_timens_vdso_data(vd);
387
388 /*
389 * Convert the clockid to a bitmask and use it to check which
390 * clocks are handled in the VDSO directly.
391 */
392 msk = 1U << clock;
393 if (msk & (VDSO_HRES | VDSO_RAW)) {
394 /*
395 * Preserves the behaviour of posix_get_hrtimer_res().
396 */
397 ns = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res);
398 } else if (msk & VDSO_COARSE) {
399 /*
400 * Preserves the behaviour of posix_get_coarse_res().
401 */
402 ns = LOW_RES_NSEC;
403 } else {
404 return -1;
405 }
406
407 if (likely(res)) {
408 res->tv_sec = 0;
409 res->tv_nsec = ns;
410 }
411 return 0;
412}
413
414static __maybe_unused
415int __cvdso_clock_getres_data(const struct vdso_data *vd, clockid_t clock,
416 struct __kernel_timespec *res)
417{
418 int ret = __cvdso_clock_getres_common(vd, clock, res);
419
420 if (unlikely(ret))
421 return clock_getres_fallback(clock, res);
422 return 0;
423}
424
425static __maybe_unused
426int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
427{
428 return __cvdso_clock_getres_data(__arch_get_vdso_data(), clock, res);
429}
430
431#ifdef BUILD_VDSO32
432static __maybe_unused int
433__cvdso_clock_getres_time32_data(const struct vdso_data *vd, clockid_t clock,
434 struct old_timespec32 *res)
435{
436 struct __kernel_timespec ts;
437 int ret;
438
439 ret = __cvdso_clock_getres_common(vd, clock, &ts);
440
441 if (unlikely(ret))
442 return clock_getres32_fallback(clock, res);
443
444 if (likely(res)) {
445 res->tv_sec = ts.tv_sec;
446 res->tv_nsec = ts.tv_nsec;
447 }
448 return ret;
449}
450
451static __maybe_unused int
452__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
453{
454 return __cvdso_clock_getres_time32_data(__arch_get_vdso_data(),
455 clock, res);
456}
457#endif /* BUILD_VDSO32 */
458#endif /* VDSO_HAS_CLOCK_GETRES */
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Generic userspace implementations of gettimeofday() and similar.
4 */
5#include <vdso/datapage.h>
6#include <vdso/helpers.h>
7
8#ifndef vdso_calc_delta
9/*
10 * Default implementation which works for all sane clocksources. That
11 * obviously excludes x86/TSC.
12 */
13static __always_inline
14u64 vdso_calc_delta(u64 cycles, u64 last, u64 mask, u32 mult)
15{
16 return ((cycles - last) & mask) * mult;
17}
18#endif
19
20#ifndef vdso_shift_ns
21static __always_inline u64 vdso_shift_ns(u64 ns, u32 shift)
22{
23 return ns >> shift;
24}
25#endif
26
27#ifndef __arch_vdso_hres_capable
28static inline bool __arch_vdso_hres_capable(void)
29{
30 return true;
31}
32#endif
33
34#ifndef vdso_clocksource_ok
35static inline bool vdso_clocksource_ok(const struct vdso_data *vd)
36{
37 return vd->clock_mode != VDSO_CLOCKMODE_NONE;
38}
39#endif
40
41#ifndef vdso_cycles_ok
42static inline bool vdso_cycles_ok(u64 cycles)
43{
44 return true;
45}
46#endif
47
48#ifdef CONFIG_TIME_NS
49static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
50 struct __kernel_timespec *ts)
51{
52 const struct vdso_data *vd = __arch_get_timens_vdso_data();
53 const struct timens_offset *offs = &vdns->offset[clk];
54 const struct vdso_timestamp *vdso_ts;
55 u64 cycles, last, ns;
56 u32 seq;
57 s64 sec;
58
59 if (clk != CLOCK_MONOTONIC_RAW)
60 vd = &vd[CS_HRES_COARSE];
61 else
62 vd = &vd[CS_RAW];
63 vdso_ts = &vd->basetime[clk];
64
65 do {
66 seq = vdso_read_begin(vd);
67
68 if (unlikely(!vdso_clocksource_ok(vd)))
69 return -1;
70
71 cycles = __arch_get_hw_counter(vd->clock_mode, vd);
72 if (unlikely(!vdso_cycles_ok(cycles)))
73 return -1;
74 ns = vdso_ts->nsec;
75 last = vd->cycle_last;
76 ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
77 ns = vdso_shift_ns(ns, vd->shift);
78 sec = vdso_ts->sec;
79 } while (unlikely(vdso_read_retry(vd, seq)));
80
81 /* Add the namespace offset */
82 sec += offs->sec;
83 ns += offs->nsec;
84
85 /*
86 * Do this outside the loop: a race inside the loop could result
87 * in __iter_div_u64_rem() being extremely slow.
88 */
89 ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
90 ts->tv_nsec = ns;
91
92 return 0;
93}
94#else
95static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
96{
97 return NULL;
98}
99
100static int do_hres_timens(const struct vdso_data *vdns, clockid_t clk,
101 struct __kernel_timespec *ts)
102{
103 return -EINVAL;
104}
105#endif
106
107static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
108 struct __kernel_timespec *ts)
109{
110 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
111 u64 cycles, last, sec, ns;
112 u32 seq;
113
114 /* Allows to compile the high resolution parts out */
115 if (!__arch_vdso_hres_capable())
116 return -1;
117
118 do {
119 /*
120 * Open coded to handle VDSO_CLOCKMODE_TIMENS. Time namespace
121 * enabled tasks have a special VVAR page installed which
122 * has vd->seq set to 1 and vd->clock_mode set to
123 * VDSO_CLOCKMODE_TIMENS. For non time namespace affected tasks
124 * this does not affect performance because if vd->seq is
125 * odd, i.e. a concurrent update is in progress the extra
126 * check for vd->clock_mode is just a few extra
127 * instructions while spin waiting for vd->seq to become
128 * even again.
129 */
130 while (unlikely((seq = READ_ONCE(vd->seq)) & 1)) {
131 if (IS_ENABLED(CONFIG_TIME_NS) &&
132 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
133 return do_hres_timens(vd, clk, ts);
134 cpu_relax();
135 }
136 smp_rmb();
137
138 if (unlikely(!vdso_clocksource_ok(vd)))
139 return -1;
140
141 cycles = __arch_get_hw_counter(vd->clock_mode, vd);
142 if (unlikely(!vdso_cycles_ok(cycles)))
143 return -1;
144 ns = vdso_ts->nsec;
145 last = vd->cycle_last;
146 ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
147 ns = vdso_shift_ns(ns, vd->shift);
148 sec = vdso_ts->sec;
149 } while (unlikely(vdso_read_retry(vd, seq)));
150
151 /*
152 * Do this outside the loop: a race inside the loop could result
153 * in __iter_div_u64_rem() being extremely slow.
154 */
155 ts->tv_sec = sec + __iter_div_u64_rem(ns, NSEC_PER_SEC, &ns);
156 ts->tv_nsec = ns;
157
158 return 0;
159}
160
161#ifdef CONFIG_TIME_NS
162static int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
163 struct __kernel_timespec *ts)
164{
165 const struct vdso_data *vd = __arch_get_timens_vdso_data();
166 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
167 const struct timens_offset *offs = &vdns->offset[clk];
168 u64 nsec;
169 s64 sec;
170 s32 seq;
171
172 do {
173 seq = vdso_read_begin(vd);
174 sec = vdso_ts->sec;
175 nsec = vdso_ts->nsec;
176 } while (unlikely(vdso_read_retry(vd, seq)));
177
178 /* Add the namespace offset */
179 sec += offs->sec;
180 nsec += offs->nsec;
181
182 /*
183 * Do this outside the loop: a race inside the loop could result
184 * in __iter_div_u64_rem() being extremely slow.
185 */
186 ts->tv_sec = sec + __iter_div_u64_rem(nsec, NSEC_PER_SEC, &nsec);
187 ts->tv_nsec = nsec;
188 return 0;
189}
190#else
191static int do_coarse_timens(const struct vdso_data *vdns, clockid_t clk,
192 struct __kernel_timespec *ts)
193{
194 return -1;
195}
196#endif
197
198static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk,
199 struct __kernel_timespec *ts)
200{
201 const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
202 u32 seq;
203
204 do {
205 /*
206 * Open coded to handle VDSO_CLOCK_TIMENS. See comment in
207 * do_hres().
208 */
209 while ((seq = READ_ONCE(vd->seq)) & 1) {
210 if (IS_ENABLED(CONFIG_TIME_NS) &&
211 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
212 return do_coarse_timens(vd, clk, ts);
213 cpu_relax();
214 }
215 smp_rmb();
216
217 ts->tv_sec = vdso_ts->sec;
218 ts->tv_nsec = vdso_ts->nsec;
219 } while (unlikely(vdso_read_retry(vd, seq)));
220
221 return 0;
222}
223
224static __always_inline int
225__cvdso_clock_gettime_common(const struct vdso_data *vd, clockid_t clock,
226 struct __kernel_timespec *ts)
227{
228 u32 msk;
229
230 /* Check for negative values or invalid clocks */
231 if (unlikely((u32) clock >= MAX_CLOCKS))
232 return -1;
233
234 /*
235 * Convert the clockid to a bitmask and use it to check which
236 * clocks are handled in the VDSO directly.
237 */
238 msk = 1U << clock;
239 if (likely(msk & VDSO_HRES))
240 vd = &vd[CS_HRES_COARSE];
241 else if (msk & VDSO_COARSE)
242 return do_coarse(&vd[CS_HRES_COARSE], clock, ts);
243 else if (msk & VDSO_RAW)
244 vd = &vd[CS_RAW];
245 else
246 return -1;
247
248 return do_hres(vd, clock, ts);
249}
250
251static __maybe_unused int
252__cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock,
253 struct __kernel_timespec *ts)
254{
255 int ret = __cvdso_clock_gettime_common(vd, clock, ts);
256
257 if (unlikely(ret))
258 return clock_gettime_fallback(clock, ts);
259 return 0;
260}
261
262static __maybe_unused int
263__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
264{
265 return __cvdso_clock_gettime_data(__arch_get_vdso_data(), clock, ts);
266}
267
268#ifdef BUILD_VDSO32
269static __maybe_unused int
270__cvdso_clock_gettime32_data(const struct vdso_data *vd, clockid_t clock,
271 struct old_timespec32 *res)
272{
273 struct __kernel_timespec ts;
274 int ret;
275
276 ret = __cvdso_clock_gettime_common(vd, clock, &ts);
277
278 if (unlikely(ret))
279 return clock_gettime32_fallback(clock, res);
280
281 /* For ret == 0 */
282 res->tv_sec = ts.tv_sec;
283 res->tv_nsec = ts.tv_nsec;
284
285 return ret;
286}
287
288static __maybe_unused int
289__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
290{
291 return __cvdso_clock_gettime32_data(__arch_get_vdso_data(), clock, res);
292}
293#endif /* BUILD_VDSO32 */
294
295static __maybe_unused int
296__cvdso_gettimeofday_data(const struct vdso_data *vd,
297 struct __kernel_old_timeval *tv, struct timezone *tz)
298{
299
300 if (likely(tv != NULL)) {
301 struct __kernel_timespec ts;
302
303 if (do_hres(&vd[CS_HRES_COARSE], CLOCK_REALTIME, &ts))
304 return gettimeofday_fallback(tv, tz);
305
306 tv->tv_sec = ts.tv_sec;
307 tv->tv_usec = (u32)ts.tv_nsec / NSEC_PER_USEC;
308 }
309
310 if (unlikely(tz != NULL)) {
311 if (IS_ENABLED(CONFIG_TIME_NS) &&
312 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
313 vd = __arch_get_timens_vdso_data();
314
315 tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
316 tz->tz_dsttime = vd[CS_HRES_COARSE].tz_dsttime;
317 }
318
319 return 0;
320}
321
322static __maybe_unused int
323__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
324{
325 return __cvdso_gettimeofday_data(__arch_get_vdso_data(), tv, tz);
326}
327
328#ifdef VDSO_HAS_TIME
329static __maybe_unused __kernel_old_time_t
330__cvdso_time_data(const struct vdso_data *vd, __kernel_old_time_t *time)
331{
332 __kernel_old_time_t t;
333
334 if (IS_ENABLED(CONFIG_TIME_NS) &&
335 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
336 vd = __arch_get_timens_vdso_data();
337
338 t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
339
340 if (time)
341 *time = t;
342
343 return t;
344}
345
346static __maybe_unused __kernel_old_time_t __cvdso_time(__kernel_old_time_t *time)
347{
348 return __cvdso_time_data(__arch_get_vdso_data(), time);
349}
350#endif /* VDSO_HAS_TIME */
351
352#ifdef VDSO_HAS_CLOCK_GETRES
353static __maybe_unused
354int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock,
355 struct __kernel_timespec *res)
356{
357 u32 msk;
358 u64 ns;
359
360 /* Check for negative values or invalid clocks */
361 if (unlikely((u32) clock >= MAX_CLOCKS))
362 return -1;
363
364 if (IS_ENABLED(CONFIG_TIME_NS) &&
365 vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
366 vd = __arch_get_timens_vdso_data();
367
368 /*
369 * Convert the clockid to a bitmask and use it to check which
370 * clocks are handled in the VDSO directly.
371 */
372 msk = 1U << clock;
373 if (msk & (VDSO_HRES | VDSO_RAW)) {
374 /*
375 * Preserves the behaviour of posix_get_hrtimer_res().
376 */
377 ns = READ_ONCE(vd[CS_HRES_COARSE].hrtimer_res);
378 } else if (msk & VDSO_COARSE) {
379 /*
380 * Preserves the behaviour of posix_get_coarse_res().
381 */
382 ns = LOW_RES_NSEC;
383 } else {
384 return -1;
385 }
386
387 if (likely(res)) {
388 res->tv_sec = 0;
389 res->tv_nsec = ns;
390 }
391 return 0;
392}
393
394static __maybe_unused
395int __cvdso_clock_getres_data(const struct vdso_data *vd, clockid_t clock,
396 struct __kernel_timespec *res)
397{
398 int ret = __cvdso_clock_getres_common(vd, clock, res);
399
400 if (unlikely(ret))
401 return clock_getres_fallback(clock, res);
402 return 0;
403}
404
405static __maybe_unused
406int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
407{
408 return __cvdso_clock_getres_data(__arch_get_vdso_data(), clock, res);
409}
410
411#ifdef BUILD_VDSO32
412static __maybe_unused int
413__cvdso_clock_getres_time32_data(const struct vdso_data *vd, clockid_t clock,
414 struct old_timespec32 *res)
415{
416 struct __kernel_timespec ts;
417 int ret;
418
419 ret = __cvdso_clock_getres_common(vd, clock, &ts);
420
421 if (unlikely(ret))
422 return clock_getres32_fallback(clock, res);
423
424 if (likely(res)) {
425 res->tv_sec = ts.tv_sec;
426 res->tv_nsec = ts.tv_nsec;
427 }
428 return ret;
429}
430
431static __maybe_unused int
432__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
433{
434 return __cvdso_clock_getres_time32_data(__arch_get_vdso_data(),
435 clock, res);
436}
437#endif /* BUILD_VDSO32 */
438#endif /* VDSO_HAS_CLOCK_GETRES */