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s390/cpum_sf: Add helper to read TOD from trailer entries

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The trailer entry contains a timestamp of the time when the sample-data-block
became full.  The timestamp specifies a TOD (time-of-day) value in either the
STCK or STCKE format.

Provide a helper function to return the TOD value depending on the setting of
time format indicator.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner
2013-12-12 17:38:50 +01:00
committed by Martin Schwidefsky
parent fcc77f5073
commit 443d4beb82
2 changed files with 13 additions and 3 deletions
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14
arch/s390/include/asm/cpu_mf.h
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@@ -125,8 +125,7 @@ struct hws_trailer_entry {
unsigned long long flags; /* 0 - 63: All indicators */
};
unsigned long long overflow; /* 64 - sample Overflow count */
unsigned long long timestamp; /* 16 - time-stamp */
unsigned long long timestamp1; /* */
unsigned char timestamp[16]; /* 16 - 31 timestamp */
unsigned long long reserved1; /* 32 -Reserved */
unsigned long long reserved2; /* */
unsigned long long progusage1; /* 48 - reserved for programming use */
@@ -232,6 +231,17 @@ static inline unsigned long sample_rate_to_freq(struct hws_qsi_info_block *qsi,
#define SDB_TE_ALERT_REQ_MASK 0x4000000000000000UL
#define SDB_TE_BUFFER_FULL_MASK 0x8000000000000000UL
/* Return TOD timestamp contained in an trailer entry */
static inline unsigned long long trailer_timestamp(struct hws_trailer_entry *te)
{
/* TOD in STCKE format */
if (te->t)
return *((unsigned long long *) &te->timestamp[1]);
/* TOD in STCK format */
return *((unsigned long long *) &te->timestamp[0]);
}
/* Return pointer to trailer entry of an sample data block */
static inline unsigned long *trailer_entry_ptr(unsigned long v)
{