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2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771 
 kernel/lib/vdso/gettimeofday.c
....@@ -17,6 +17,13 @@
1717 }
1818 #endif
1919 
20
+#ifndef vdso_shift_ns
21
+static __always_inline u64 vdso_shift_ns(u64 ns, u32 shift)
22
+{
23
+	return ns >> shift;
24
+}
25
+#endif
26
+
2027 #ifndef __arch_vdso_hres_capable
2128 static inline bool __arch_vdso_hres_capable(void)
2229 {
....@@ -24,8 +31,81 @@
2431 }
2532 #endif
2633 
34
+#ifndef vdso_clocksource_ok
35
+static 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
42
+static inline bool vdso_cycles_ok(u64 cycles)
43
+{
44
+	return true;
45
+}
46
+#endif
47
+
48
+#ifdef CONFIG_TIME_NS
49
+static __always_inline 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
95
+static __always_inline const struct vdso_data *__arch_get_timens_vdso_data(void)
96
+{
97
+	return NULL;
98
+}
99
+
100
+static __always_inline 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
+
27107 static __always_inline int do_hres(const struct vdso_data *vd, clockid_t clk,
28
-		   struct __kernel_timespec *ts)
108
+				   struct __kernel_timespec *ts)
29109 {
30110 	const struct vdso_timestamp *vdso_ts = &vd->basetime[clk];
31111 	u64 cycles, last, sec, ns;
....@@ -36,15 +116,35 @@
36116 		return -1;
37117 
38118 	do {
39
-		seq = vdso_read_begin(vd);
40
-		cycles = __arch_get_hw_counter(vd->clock_mode);
41
-		ns = vdso_ts->nsec;
42
-		last = vd->cycle_last;
43
-		if (unlikely((s64)cycles < 0))
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)))
44139 			return -1;
45140 
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;
46146 		ns += vdso_calc_delta(cycles, last, vd->mask, vd->mult);
47
-		ns >>= vd->shift;
147
+		ns = vdso_shift_ns(ns, vd->shift);
48148 		sec = vdso_ts->sec;
49149 	} while (unlikely(vdso_read_retry(vd, seq)));
50150 
....@@ -58,6 +158,43 @@
58158 	return 0;
59159 }
60160 
161
+#ifdef CONFIG_TIME_NS
162
+static __always_inline 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
191
+static __always_inline 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
+
61198 static __always_inline int do_coarse(const struct vdso_data *vd, clockid_t clk,
62199 				     struct __kernel_timespec *ts)
63200 {
....@@ -65,7 +202,18 @@
65202 	u32 seq;
66203 
67204 	do {
68
-		seq = vdso_read_begin(vd);
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
+
69217 		ts->tv_sec = vdso_ts->sec;
70218 		ts->tv_nsec = vdso_ts->nsec;
71219 	} while (unlikely(vdso_read_retry(vd, seq)));
....@@ -73,10 +221,10 @@
73221 	return 0;
74222 }
75223 
76
-static __maybe_unused int
77
-__cvdso_clock_gettime_common(clockid_t clock, struct __kernel_timespec *ts)
224
+static __always_inline int
225
+__cvdso_clock_gettime_common(const struct vdso_data *vd, clockid_t clock,
226
+			     struct __kernel_timespec *ts)
78227 {
79
-	const struct vdso_data *vd = __arch_get_vdso_data();
80228 	u32 msk;
81229 
82230 	/* Check for negative values or invalid clocks */
....@@ -101,31 +249,34 @@
101249 }
102250 
103251 static __maybe_unused int
104
-__cvdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts)
252
+__cvdso_clock_gettime_data(const struct vdso_data *vd, clockid_t clock,
253
+			   struct __kernel_timespec *ts)
105254 {
106
-	int ret = __cvdso_clock_gettime_common(clock, ts);
255
+	int ret = __cvdso_clock_gettime_common(vd, clock, ts);
107256 
108257 	if (unlikely(ret))
109258 		return clock_gettime_fallback(clock, ts);
110259 	return 0;
111260 }
112261 
262
+static __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
+
113268 #ifdef BUILD_VDSO32
114269 static __maybe_unused int
115
-__cvdso_clock_gettime32(clockid_t clock, struct old_timespec32 *res)
270
+__cvdso_clock_gettime32_data(const struct vdso_data *vd, clockid_t clock,
271
+			     struct old_timespec32 *res)
116272 {
117273 	struct __kernel_timespec ts;
118274 	int ret;
119275 
120
-	ret = __cvdso_clock_gettime_common(clock, &ts);
276
+	ret = __cvdso_clock_gettime_common(vd, clock, &ts);
121277 
122
-#ifdef VDSO_HAS_32BIT_FALLBACK
123278 	if (unlikely(ret))
124279 		return clock_gettime32_fallback(clock, res);
125
-#else
126
-	if (unlikely(ret))
127
-		ret = clock_gettime_fallback(clock, &ts);
128
-#endif
129280 
130281 	/* For ret == 0 */
131282 	res->tv_sec = ts.tv_sec;
....@@ -133,12 +284,18 @@
133284 
134285 	return ret;
135286 }
287
+
288
+static __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
+}
136293 #endif /* BUILD_VDSO32 */
137294 
138295 static __maybe_unused int
139
-__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
296
+__cvdso_gettimeofday_data(const struct vdso_data *vd,
297
+			  struct __kernel_old_timeval *tv, struct timezone *tz)
140298 {
141
-	const struct vdso_data *vd = __arch_get_vdso_data();
142299 
143300 	if (likely(tv != NULL)) {
144301 		struct __kernel_timespec ts;
....@@ -151,6 +308,10 @@
151308 	}
152309 
153310 	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
+
154315 		tz->tz_minuteswest = vd[CS_HRES_COARSE].tz_minuteswest;
155316 		tz->tz_dsttime = vd[CS_HRES_COARSE].tz_dsttime;
156317 	}
....@@ -158,30 +319,51 @@
158319 	return 0;
159320 }
160321 
161
-#ifdef VDSO_HAS_TIME
162
-static __maybe_unused time_t __cvdso_time(time_t *time)
322
+static __maybe_unused int
323
+__cvdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz)
163324 {
164
-	const struct vdso_data *vd = __arch_get_vdso_data();
165
-	time_t t = READ_ONCE(vd[CS_HRES_COARSE].basetime[CLOCK_REALTIME].sec);
325
+	return __cvdso_gettimeofday_data(__arch_get_vdso_data(), tv, tz);
326
+}
327
+
328
+#ifdef VDSO_HAS_TIME
329
+static __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);
166339 
167340 	if (time)
168341 		*time = t;
169342 
170343 	return t;
171344 }
345
+
346
+static __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
+}
172350 #endif /* VDSO_HAS_TIME */
173351 
174352 #ifdef VDSO_HAS_CLOCK_GETRES
175353 static __maybe_unused
176
-int __cvdso_clock_getres_common(clockid_t clock, struct __kernel_timespec *res)
354
+int __cvdso_clock_getres_common(const struct vdso_data *vd, clockid_t clock,
355
+				struct __kernel_timespec *res)
177356 {
178
-	const struct vdso_data *vd = __arch_get_vdso_data();
179357 	u32 msk;
180358 	u64 ns;
181359 
182360 	/* Check for negative values or invalid clocks */
183361 	if (unlikely((u32) clock >= MAX_CLOCKS))
184362 		return -1;
363
+
364
+	if (IS_ENABLED(CONFIG_TIME_NS) &&
365
+	    vd->clock_mode == VDSO_CLOCKMODE_TIMENS)
366
+		vd = __arch_get_timens_vdso_data();
185367 
186368 	/*
187369 	 * Convert the clockid to a bitmask and use it to check which
....@@ -210,34 +392,34 @@
210392 }
211393 
212394 static __maybe_unused
213
-int __cvdso_clock_getres(clockid_t clock, struct __kernel_timespec *res)
395
+int __cvdso_clock_getres_data(const struct vdso_data *vd, clockid_t clock,
396
+			      struct __kernel_timespec *res)
214397 {
215
-	int ret = __cvdso_clock_getres_common(clock, res);
398
+	int ret = __cvdso_clock_getres_common(vd, clock, res);
216399 
217400 	if (unlikely(ret))
218401 		return clock_getres_fallback(clock, res);
219402 	return 0;
220403 }
221404 
405
+static __maybe_unused
406
+int __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
+
222411 #ifdef BUILD_VDSO32
223412 static __maybe_unused int
224
-__cvdso_clock_getres_time32(clockid_t clock, struct old_timespec32 *res)
413
+__cvdso_clock_getres_time32_data(const struct vdso_data *vd, clockid_t clock,
414
+				 struct old_timespec32 *res)
225415 {
226416 	struct __kernel_timespec ts;
227417 	int ret;
228418 
229
-	ret = __cvdso_clock_getres_common(clock, &ts);
419
+	ret = __cvdso_clock_getres_common(vd, clock, &ts);
230420 
231
-#ifdef VDSO_HAS_32BIT_FALLBACK
232421 	if (unlikely(ret))
233422 		return clock_getres32_fallback(clock, res);
234
-#else
235
-	if (unlikely(ret)) {
236
-		ret = clock_getres_fallback(clock, &ts);
237
-		if (unlikely(ret))
238
-			return ret;
239
-	}
240
-#endif
241423 
242424 	if (likely(res)) {
243425 		res->tv_sec = ts.tv_sec;
....@@ -245,5 +427,12 @@
245427 	}
246428 	return ret;
247429 }
430
+
431
+static __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
+}
248437 #endif /* BUILD_VDSO32 */
249438 #endif /* VDSO_HAS_CLOCK_GETRES */