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hc
2024-05-10 093a6c67005148ae32a5c9e4553491b9f5c2457b 
 kernel/include/linux/clocksource.h
....@@ -23,7 +23,8 @@
2323 struct clocksource;
2424 struct module;
2525 
26
-#ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
26
+#if defined(CONFIG_ARCH_CLOCKSOURCE_DATA) || \
27
+    defined(CONFIG_GENERIC_GETTIMEOFDAY)
2728 #include <asm/clocksource.h>
2829 #endif
2930 
....@@ -34,9 +35,19 @@
3435  *	Provides mostly state-free accessors to the underlying hardware.
3536  *	This is the structure used for system time.
3637  *
37
- * @name:		ptr to clocksource name
38
- * @list:		list head for registration
39
- * @rating:		rating value for selection (higher is better)
38
+ * @read:		Returns a cycle value, passes clocksource as argument
39
+ * @mask:		Bitmask for two's complement
40
+ *			subtraction of non 64 bit counters
41
+ * @mult:		Cycle to nanosecond multiplier
42
+ * @shift:		Cycle to nanosecond divisor (power of two)
43
+ * @max_idle_ns:	Maximum idle time permitted by the clocksource (nsecs)
44
+ * @maxadj:		Maximum adjustment value to mult (~11%)
45
+ * @archdata:		Optional arch-specific data
46
+ * @max_cycles:		Maximum safe cycle value which won't overflow on
47
+ *			multiplication
48
+ * @name:		Pointer to clocksource name
49
+ * @list:		List head for registration (internal)
50
+ * @rating:		Rating value for selection (higher is better)
4051  *			To avoid rating inflation the following
4152  *			list should give you a guide as to how
4253  *			to assign your clocksource a rating
....@@ -51,27 +62,23 @@
5162  *			400-499: Perfect
5263  *				The ideal clocksource. A must-use where
5364  *				available.
54
- * @read:		returns a cycle value, passes clocksource as argument
55
- * @enable:		optional function to enable the clocksource
56
- * @disable:		optional function to disable the clocksource
57
- * @mask:		bitmask for two's complement
58
- *			subtraction of non 64 bit counters
59
- * @mult:		cycle to nanosecond multiplier
60
- * @shift:		cycle to nanosecond divisor (power of two)
61
- * @max_idle_ns:	max idle time permitted by the clocksource (nsecs)
62
- * @maxadj:		maximum adjustment value to mult (~11%)
63
- * @max_cycles:		maximum safe cycle value which won't overflow on multiplication
64
- * @flags:		flags describing special properties
65
- * @archdata:		arch-specific data
66
- * @suspend:		suspend function for the clocksource, if necessary
67
- * @resume:		resume function for the clocksource, if necessary
65
+ * @flags:		Flags describing special properties
66
+ * @enable:		Optional function to enable the clocksource
67
+ * @disable:		Optional function to disable the clocksource
68
+ * @suspend:		Optional suspend function for the clocksource
69
+ * @resume:		Optional resume function for the clocksource
6870  * @mark_unstable:	Optional function to inform the clocksource driver that
6971  *			the watchdog marked the clocksource unstable
70
- * @owner:		module reference, must be set by clocksource in modules
72
+ * @tick_stable:        Optional function called periodically from the watchdog
73
+ *			code to provide stable syncrhonization points
74
+ * @wd_list:		List head to enqueue into the watchdog list (internal)
75
+ * @cs_last:		Last clocksource value for clocksource watchdog
76
+ * @wd_last:		Last watchdog value corresponding to @cs_last
77
+ * @owner:		Module reference, must be set by clocksource in modules
7178  *
7279  * Note: This struct is not used in hotpathes of the timekeeping code
7380  * because the timekeeper caches the hot path fields in its own data
74
- * structure, so no line cache alignment is required,
81
+ * structure, so no cache line alignment is required,
7582  *
7683  * The pointer to the clocksource itself is handed to the read
7784  * callback. If you need extra information there you can wrap struct
....@@ -80,35 +87,37 @@
8087  * structure.
8188  */
8289 struct clocksource {
83
-	u64 (*read)(struct clocksource *cs);
84
-	u64 mask;
85
-	u32 mult;
86
-	u32 shift;
87
-	u64 max_idle_ns;
88
-	u32 maxadj;
90
+	u64			(*read)(struct clocksource *cs);
91
+	u64			mask;
92
+	u32			mult;
93
+	u32			shift;
94
+	u64			max_idle_ns;
95
+	u32			maxadj;
8996 #ifdef CONFIG_ARCH_CLOCKSOURCE_DATA
9097 	struct arch_clocksource_data archdata;
9198 #endif
92
-	u64 max_cycles;
93
-	const char *name;
94
-	struct list_head list;
95
-	int rating;
96
-	int (*enable)(struct clocksource *cs);
97
-	void (*disable)(struct clocksource *cs);
98
-	unsigned long flags;
99
-	void (*suspend)(struct clocksource *cs);
100
-	void (*resume)(struct clocksource *cs);
101
-	void (*mark_unstable)(struct clocksource *cs);
102
-	void (*tick_stable)(struct clocksource *cs);
99
+	u64			max_cycles;
100
+	const char		*name;
101
+	struct list_head	list;
102
+	int			rating;
103
+	enum vdso_clock_mode	vdso_clock_mode;
104
+	unsigned long		flags;
105
+
106
+	int			(*enable)(struct clocksource *cs);
107
+	void			(*disable)(struct clocksource *cs);
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+	void			(*suspend)(struct clocksource *cs);
109
+	void			(*resume)(struct clocksource *cs);
110
+	void			(*mark_unstable)(struct clocksource *cs);
111
+	void			(*tick_stable)(struct clocksource *cs);
103112 
104113 	/* private: */
105114 #ifdef CONFIG_CLOCKSOURCE_WATCHDOG
106115 	/* Watchdog related data, used by the framework */
107
-	struct list_head wd_list;
108
-	u64 cs_last;
109
-	u64 wd_last;
116
+	struct list_head	wd_list;
117
+	u64			cs_last;
118
+	u64			wd_last;
110119 #endif
111
-	struct module *owner;
120
+	struct module		*owner;
112121 };
113122 
114123 /*
....@@ -122,7 +131,7 @@
122131 #define CLOCK_SOURCE_UNSTABLE			0x40
123132 #define CLOCK_SOURCE_SUSPEND_NONSTOP		0x80
124133 #define CLOCK_SOURCE_RESELECT			0x100
125
-
134
+#define CLOCK_SOURCE_VERIFY_PERCPU		0x200
126135 /* simplify initialization of mask field */
127136 #define CLOCKSOURCE_MASK(bits) GENMASK_ULL((bits) - 1, 0)
128137 
....@@ -243,6 +252,11 @@
243252 	__clocksource_update_freq_scale(cs, 1000, khz);
244253 }
245254 
255
+#ifdef CONFIG_ARCH_CLOCKSOURCE_INIT
256
+extern void clocksource_arch_init(struct clocksource *cs);
257
+#else
258
+static inline void clocksource_arch_init(struct clocksource *cs) { }
259
+#endif
246260 
247261 extern int timekeeping_notify(struct clocksource *clock);
248262 
....@@ -258,9 +272,6 @@
258272 
259273 #define TIMER_OF_DECLARE(name, compat, fn) \
260274 	OF_DECLARE_1_RET(timer, name, compat, fn)
261
-
262
-#define CLOCKSOURCE_OF_DECLARE(name, compat, fn) \
263
-	TIMER_OF_DECLARE(name, compat, fn)
264275 
265276 #ifdef CONFIG_TIMER_PROBE
266277 extern void timer_probe(void);