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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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75c7b6f3f6
On STP sync events the TOD clock will jump in time, either forward or backward. The TOD clocksource claims to be continuous but in case of an STP sync with a negative offset it is not. Subtract the offset injected by the STP sync check from the result of the TOD clocksource to make it continuous again. Add code to drift the offset towards zero with a fixed rate, steering 1 second in ~9 hours. Suggested-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
#ifndef __S390_VDSO_H__
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#define __S390_VDSO_H__
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/* Default link addresses for the vDSOs */
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#define VDSO32_LBASE 0
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#define VDSO64_LBASE 0
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#define VDSO_VERSION_STRING LINUX_2.6.29
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#ifndef __ASSEMBLY__
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/*
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* Note about the vdso_data and vdso_per_cpu_data structures:
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*
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* NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the
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* structure is supposed to be known only to the function in the vdso
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* itself and may change without notice.
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*/
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struct vdso_data {
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__u64 tb_update_count; /* Timebase atomicity ctr 0x00 */
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__u64 xtime_tod_stamp; /* TOD clock for xtime 0x08 */
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__u64 xtime_clock_sec; /* Kernel time 0x10 */
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__u64 xtime_clock_nsec; /* 0x18 */
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__u64 xtime_coarse_sec; /* Coarse kernel time 0x20 */
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__u64 xtime_coarse_nsec; /* 0x28 */
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__u64 wtom_clock_sec; /* Wall to monotonic clock 0x30 */
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__u64 wtom_clock_nsec; /* 0x38 */
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__u64 wtom_coarse_sec; /* Coarse wall to monotonic 0x40 */
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__u64 wtom_coarse_nsec; /* 0x48 */
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__u32 tz_minuteswest; /* Minutes west of Greenwich 0x50 */
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__u32 tz_dsttime; /* Type of dst correction 0x54 */
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__u32 ectg_available; /* ECTG instruction present 0x58 */
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__u32 tk_mult; /* Mult. used for xtime_nsec 0x5c */
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__u32 tk_shift; /* Shift used for xtime_nsec 0x60 */
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__u32 ts_dir; /* TOD steering direction 0x64 */
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__u64 ts_end; /* TOD steering end 0x68 */
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};
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struct vdso_per_cpu_data {
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__u64 ectg_timer_base;
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__u64 ectg_user_time;
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__u32 cpu_nr;
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__u32 node_id;
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};
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extern struct vdso_data *vdso_data;
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int vdso_alloc_per_cpu(struct lowcore *lowcore);
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void vdso_free_per_cpu(struct lowcore *lowcore);
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#endif /* __ASSEMBLY__ */
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#endif /* __S390_VDSO_H__ */
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