aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/clocksource.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2015-02-10 23:01:30 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-10 23:01:30 -0500
commitc5ce28df0e7c01a1de23c36ebdefcd803f2b6cbb (patch)
tree9830baf38832769e1cf621708889111bbe3c93df /include/linux/clocksource.h
parent29afc4e9a408f2304e09c6dd0dbcfbd2356d0faa (diff)
parent9399f0c51489ae8c16d6559b82a452fdc1895e91 (diff)
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next
Pull networking updates from David Miller: 1) More iov_iter conversion work from Al Viro. [ The "crypto: switch af_alg_make_sg() to iov_iter" commit was wrong, and this pull actually adds an extra commit on top of the branch I'm pulling to fix that up, so that the pre-merge state is ok. - Linus ] 2) Various optimizations to the ipv4 forwarding information base trie lookup implementation. From Alexander Duyck. 3) Remove sock_iocb altogether, from CHristoph Hellwig. 4) Allow congestion control algorithm selection via routing metrics. From Daniel Borkmann. 5) Make ipv4 uncached route list per-cpu, from Eric Dumazet. 6) Handle rfs hash collisions more gracefully, also from Eric Dumazet. 7) Add xmit_more support to r8169, e1000, and e1000e drivers. From Florian Westphal. 8) Transparent Ethernet Bridging support for GRO, from Jesse Gross. 9) Add BPF packet actions to packet scheduler, from Jiri Pirko. 10) Add support for uniqu flow IDs to openvswitch, from Joe Stringer. 11) New NetCP ethernet driver, from Muralidharan Karicheri and Wingman Kwok. 12) More sanely handle out-of-window dupacks, which can result in serious ACK storms. From Neal Cardwell. 13) Various rhashtable bug fixes and enhancements, from Herbert Xu, Patrick McHardy, and Thomas Graf. 14) Support xmit_more in be2net, from Sathya Perla. 15) Group Policy extensions for vxlan, from Thomas Graf. 16) Remove Checksum Offload support for vxlan, from Tom Herbert. 17) Like ipv4, support lockless transmit over ipv6 UDP sockets. From Vlad Yasevich. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1494+1 commits) crypto: fix af_alg_make_sg() conversion to iov_iter ipv4: Namespecify TCP PMTU mechanism i40e: Fix for stats init function call in Rx setup tcp: don't include Fast Open option in SYN-ACK on pure SYN-data openvswitch: Only set TUNNEL_VXLAN_OPT if VXLAN-GBP metadata is set ipv6: Make __ipv6_select_ident static ipv6: Fix fragment id assignment on LE arches. bridge: Fix inability to add non-vlan fdb entry net: Mellanox: Delete unnecessary checks before the function call "vunmap" cxgb4: Add support in cxgb4 to get expansion rom version via ethtool ethtool: rename reserved1 memeber in ethtool_drvinfo for expansion ROM version net: dsa: Remove redundant phy_attach() IB/mlx4: Reset flow support for IB kernel ULPs IB/mlx4: Always use the correct port for mirrored multicast attachments net/bonding: Fix potential bad memory access during bonding events tipc: remove tipc_snprintf tipc: nl compat add noop and remove legacy nl framework tipc: convert legacy nl stats show to nl compat tipc: convert legacy nl net id get to nl compat tipc: convert legacy nl net id set to nl compat ...
Diffstat (limited to 'include/linux/clocksource.h')
-rw-r--r--include/linux/clocksource.h102
1 files changed, 0 insertions, 102 deletions
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index abcafaa20b86..9c78d15d33e4 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -18,8 +18,6 @@
18#include <asm/div64.h> 18#include <asm/div64.h>
19#include <asm/io.h> 19#include <asm/io.h>
20 20
21/* clocksource cycle base type */
22typedef u64 cycle_t;
23struct clocksource; 21struct clocksource;
24struct module; 22struct module;
25 23
@@ -28,106 +26,6 @@ struct module;
28#endif 26#endif
29 27
30/** 28/**
31 * struct cyclecounter - hardware abstraction for a free running counter
32 * Provides completely state-free accessors to the underlying hardware.
33 * Depending on which hardware it reads, the cycle counter may wrap
34 * around quickly. Locking rules (if necessary) have to be defined
35 * by the implementor and user of specific instances of this API.
36 *
37 * @read: returns the current cycle value
38 * @mask: bitmask for two's complement
39 * subtraction of non 64 bit counters,
40 * see CLOCKSOURCE_MASK() helper macro
41 * @mult: cycle to nanosecond multiplier
42 * @shift: cycle to nanosecond divisor (power of two)
43 */
44struct cyclecounter {
45 cycle_t (*read)(const struct cyclecounter *cc);
46 cycle_t mask;
47 u32 mult;
48 u32 shift;
49};
50
51/**
52 * struct timecounter - layer above a %struct cyclecounter which counts nanoseconds
53 * Contains the state needed by timecounter_read() to detect
54 * cycle counter wrap around. Initialize with
55 * timecounter_init(). Also used to convert cycle counts into the
56 * corresponding nanosecond counts with timecounter_cyc2time(). Users
57 * of this code are responsible for initializing the underlying
58 * cycle counter hardware, locking issues and reading the time
59 * more often than the cycle counter wraps around. The nanosecond
60 * counter will only wrap around after ~585 years.
61 *
62 * @cc: the cycle counter used by this instance
63 * @cycle_last: most recent cycle counter value seen by
64 * timecounter_read()
65 * @nsec: continuously increasing count
66 */
67struct timecounter {
68 const struct cyclecounter *cc;
69 cycle_t cycle_last;
70 u64 nsec;
71};
72
73/**
74 * cyclecounter_cyc2ns - converts cycle counter cycles to nanoseconds
75 * @cc: Pointer to cycle counter.
76 * @cycles: Cycles
77 *
78 * XXX - This could use some mult_lxl_ll() asm optimization. Same code
79 * as in cyc2ns, but with unsigned result.
80 */
81static inline u64 cyclecounter_cyc2ns(const struct cyclecounter *cc,
82 cycle_t cycles)
83{
84 u64 ret = (u64)cycles;
85 ret = (ret * cc->mult) >> cc->shift;
86 return ret;
87}
88
89/**
90 * timecounter_init - initialize a time counter
91 * @tc: Pointer to time counter which is to be initialized/reset
92 * @cc: A cycle counter, ready to be used.
93 * @start_tstamp: Arbitrary initial time stamp.
94 *
95 * After this call the current cycle register (roughly) corresponds to
96 * the initial time stamp. Every call to timecounter_read() increments
97 * the time stamp counter by the number of elapsed nanoseconds.
98 */
99extern void timecounter_init(struct timecounter *tc,
100 const struct cyclecounter *cc,
101 u64 start_tstamp);
102
103/**
104 * timecounter_read - return nanoseconds elapsed since timecounter_init()
105 * plus the initial time stamp
106 * @tc: Pointer to time counter.
107 *
108 * In other words, keeps track of time since the same epoch as
109 * the function which generated the initial time stamp.
110 */
111extern u64 timecounter_read(struct timecounter *tc);
112
113/**
114 * timecounter_cyc2time - convert a cycle counter to same
115 * time base as values returned by
116 * timecounter_read()
117 * @tc: Pointer to time counter.
118 * @cycle_tstamp: a value returned by tc->cc->read()
119 *
120 * Cycle counts that are converted correctly as long as they
121 * fall into the interval [-1/2 max cycle count, +1/2 max cycle count],
122 * with "max cycle count" == cs->mask+1.
123 *
124 * This allows conversion of cycle counter values which were generated
125 * in the past.
126 */
127extern u64 timecounter_cyc2time(struct timecounter *tc,
128 cycle_t cycle_tstamp);
129
130/**
131 * struct clocksource - hardware abstraction for a free running counter 29 * struct clocksource - hardware abstraction for a free running counter
132 * Provides mostly state-free accessors to the underlying hardware. 30 * Provides mostly state-free accessors to the underlying hardware.
133 * This is the structure used for system time. 31 * This is the structure used for system time.