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powerpc/perf: Factor out event_alternative function 

Factor out the power8 event_alternative function to share
the code with power9.

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Madhavan Srinivasan 2017-02-12 22:33:10 +05:30 committed by Michael Ellerman
parent 753843471c
commit efe881afdd
3 changed files with 41 additions and 33 deletions
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36
arch/powerpc/perf/isa207-common.c
View File

@ -338,3 +338,39 @@ void isa207_disable_pmc(unsigned int pmc, unsigned long mmcr[])
if (pmc <= 3)
mmcr[1] &= ~(0xffUL << MMCR1_PMCSEL_SHIFT(pmc + 1));
}
static int find_alternative(u64 event, const unsigned int ev_alt[][MAX_ALT], int size)
{
int i, j;
for (i = 0; i < size; ++i) {
if (event < ev_alt[i][0])
break;
for (j = 0; j < MAX_ALT && ev_alt[i][j]; ++j)
if (event == ev_alt[i][j])
return i;
}
return -1;
}
int isa207_get_alternatives(u64 event, u64 alt[],
const unsigned int ev_alt[][MAX_ALT], int size)
{
int i, j, num_alt = 0;
u64 alt_event;
alt[num_alt++] = event;
i = find_alternative(event, ev_alt, size);
if (i >= 0) {
/* Filter out the original event, it's already in alt[0] */
for (j = 0; j < MAX_ALT; ++j) {
alt_event = ev_alt[i][j];
if (alt_event && alt_event != event)
alt[num_alt++] = alt_event;
}
}
return num_alt;
}

3
arch/powerpc/perf/isa207-common.h
View File

@ -260,5 +260,8 @@ int isa207_compute_mmcr(u64 event[], int n_ev,
unsigned int hwc[], unsigned long mmcr[],
struct perf_event *pevents[]);
void isa207_disable_pmc(unsigned int pmc, unsigned long mmcr[]);
int isa207_get_alternatives(u64 event, u64 alt[],
const unsigned int ev_alt[][MAX_ALT], int size);
#endif

35
arch/powerpc/perf/power8-pmu.c
View File

@ -48,43 +48,12 @@ static const unsigned int event_alternatives[][MAX_ALT] = {
{ PM_RUN_INST_CMPL_ALT, PM_RUN_INST_CMPL },
};
/*
* Scan the alternatives table for a match and return the
* index into the alternatives table if found, else -1.
*/
static int find_alternative(u64 event)
{
int i, j;
for (i = 0; i < ARRAY_SIZE(event_alternatives); ++i) {
if (event < event_alternatives[i][0])
break;
for (j = 0; j < MAX_ALT && event_alternatives[i][j]; ++j)
if (event == event_alternatives[i][j])
return i;
}
return -1;
}
static int power8_get_alternatives(u64 event, unsigned int flags, u64 alt[])
{
int i, j, num_alt = 0;
u64 alt_event;
alt[num_alt++] = event;
i = find_alternative(event);
if (i >= 0) {
/* Filter out the original event, it's already in alt[0] */
for (j = 0; j < MAX_ALT; ++j) {
alt_event = event_alternatives[i][j];
if (alt_event && alt_event != event)
alt[num_alt++] = alt_event;
}
}
num_alt = isa207_get_alternatives(event, alt, event_alternatives,
(int)ARRAY_SIZE(event_alternatives));
if (flags & PPMU_ONLY_COUNT_RUN) {
/*
* We're only counting in RUN state, so PM_CYC is equivalent to