Release 4.14 arch/mips/kernel/csrc-r4k.c
/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2007 by Ralf Baechle
*/
#include <linux/clocksource.h>
#include <linux/init.h>
#include <linux/sched_clock.h>
#include <asm/time.h>
static u64 c0_hpt_read(struct clocksource *cs)
{
return read_c0_count();
}
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| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 10 | 66.67% | 1 | 33.33% |
| Magnus Damm | 4 | 26.67% | 1 | 33.33% |
| Thomas Gleixner | 1 | 6.67% | 1 | 33.33% |
| Total | 15 | 100.00% | 3 | 100.00% |
static struct clocksource clocksource_mips = {
.name = "MIPS",
.read = c0_hpt_read,
.mask = CLOCKSOURCE_MASK(32),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static u64 __maybe_unused notrace r4k_read_sched_clock(void)
{
return read_c0_count();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Deng-Cheng Zhu | 13 | 92.86% | 1 | 50.00% |
| Huacai Chen | 1 | 7.14% | 1 | 50.00% |
| Total | 14 | 100.00% | 2 | 100.00% |
static inline unsigned int rdhwr_count(void)
{
unsigned int count;
__asm__ __volatile__(
" .set push\n"
" .set mips32r2\n"
" rdhwr %0, $2\n"
" .set pop\n"
: "=r" (count));
return count;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Smith | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static bool rdhwr_count_usable(void)
{
unsigned int prev, curr, i;
/*
* Older QEMUs have a broken implementation of RDHWR for the CP0 count
* which always returns a constant value. Try to identify this and don't
* use it in the VDSO if it is broken. This workaround can be removed
* once the fix has been in QEMU stable for a reasonable amount of time.
*/
for (i = 0, prev = rdhwr_count(); i < 100; i++) {
curr = rdhwr_count();
if (curr != prev)
return true;
prev = curr;
}
pr_warn("Not using R4K clocksource in VDSO due to broken RDHWR\n");
return false;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Smith | 63 | 100.00% | 1 | 100.00% |
| Total | 63 | 100.00% | 1 | 100.00% |
int __init init_r4k_clocksource(void)
{
if (!cpu_has_counter || !mips_hpt_frequency)
return -ENXIO;
/* Calculate a somewhat reasonable rating value */
clocksource_mips.rating = 200 + mips_hpt_frequency / 10000000;
/*
* R2 onwards makes the count accessible to user mode so it can be used
* by the VDSO (HWREna is configured by configure_hwrena()).
*/
if (cpu_has_mips_r2_r6 && rdhwr_count_usable())
clocksource_mips.archdata.vdso_clock_mode = VDSO_CLOCK_R4K;
clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
#ifndef CONFIG_CPU_FREQ
sched_clock_register(r4k_read_sched_clock, 32, mips_hpt_frequency);
#endif
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ralf Bächle | 40 | 55.56% | 3 | 37.50% |
| Alex Smith | 16 | 22.22% | 1 | 12.50% |
| Deng-Cheng Zhu | 9 | 12.50% | 1 | 12.50% |
| Huacai Chen | 5 | 6.94% | 1 | 12.50% |
| John Stultz | 1 | 1.39% | 1 | 12.50% |
| Manuel Lauss | 1 | 1.39% | 1 | 12.50% |
| Total | 72 | 100.00% | 8 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Alex Smith | 99 | 43.61% | 1 | 9.09% |
| Ralf Bächle | 90 | 39.65% | 4 | 36.36% |
| Deng-Cheng Zhu | 25 | 11.01% | 1 | 9.09% |
| Huacai Chen | 6 | 2.64% | 1 | 9.09% |
| Magnus Damm | 4 | 1.76% | 1 | 9.09% |
| John Stultz | 1 | 0.44% | 1 | 9.09% |
| Manuel Lauss | 1 | 0.44% | 1 | 9.09% |
| Thomas Gleixner | 1 | 0.44% | 1 | 9.09% |
| Total | 227 | 100.00% | 11 | 100.00% |
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