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sched_clock: Use seqcount instead of rolling our own 

We're going to increase the cyc value to 64 bits in the near
future. Doing that is going to break the custom seqcount
implementation in the sched_clock code because 64 bit numbers
aren't guaranteed to be atomic. Replace the cyc_copy with a
seqcount to avoid this problem.

Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Git-commit: 85c3d2dd15
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[imaund@codeaurora.org: resolve merge conflicts]
Signed-off-by: Ian Maund <imaund@codeaurora.org>

Change-Id: If7fae3228ff425c9f1763145cbd5c851141c7755
This commit is contained in:
Stephen Boyd 2014-01-21 16:56:38 -08:00 committed by Artem Borisov
parent 8c7175ba39
commit 538b187b6e
1 changed files with 8 additions and 19 deletions
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27
kernel/time/sched_clock.c
View File

@ -13,11 +13,12 @@
#include <linux/syscore_ops.h>
#include <linux/timer.h>
#include <linux/sched_clock.h>
#include <linux/seqlock.h>
struct clock_data {
u64 epoch_ns;
u32 epoch_cyc;
u32 epoch_cyc_copy;
seqcount_t seq;
unsigned long rate;
u32 mult;
u32 shift;
@ -51,23 +52,16 @@ static unsigned long long notrace sched_clock_32(void)
u64 epoch_ns;
u32 epoch_cyc;
u32 cyc;
unsigned long seq;
if (cd.suspended)
return cd.epoch_ns;
/*
* Load the epoch_cyc and epoch_ns atomically. We do this by
* ensuring that we always write epoch_cyc, epoch_ns and
* epoch_cyc_copy in strict order, and read them in strict order.
* If epoch_cyc and epoch_cyc_copy are not equal, then we're in
* the middle of an update, and we should repeat the load.
*/
do {
seq = read_seqcount_begin(&cd.seq);
epoch_cyc = cd.epoch_cyc;
smp_rmb();
epoch_ns = cd.epoch_ns;
smp_rmb();
} while (epoch_cyc != cd.epoch_cyc_copy);
} while (read_seqcount_retry(&cd.seq, seq));
cyc = read_sched_clock();
cyc = (cyc - epoch_cyc) & sched_clock_mask;
@ -87,16 +81,12 @@ static void notrace update_sched_clock(void)
ns = cd.epoch_ns +
cyc_to_ns((cyc - cd.epoch_cyc) & sched_clock_mask,
cd.mult, cd.shift);
/*
* Write epoch_cyc and epoch_ns in a way that the update is
* detectable in cyc_to_fixed_sched_clock().
*/
raw_local_irq_save(flags);
cd.epoch_cyc_copy = cyc;
smp_wmb();
write_seqcount_begin(&cd.seq);
cd.epoch_ns = ns;
smp_wmb();
cd.epoch_cyc = cyc;
write_seqcount_end(&cd.seq);
raw_local_irq_restore(flags);
}
@ -188,7 +178,6 @@ static int sched_clock_suspend(void)
static void sched_clock_resume(void)
{
cd.epoch_cyc = read_sched_clock();
cd.epoch_cyc_copy = cd.epoch_cyc;
cd.suspended = false;
}