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sparc64: Support perf event encoding for multi-PCR PMUs.

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-08-17 03:29:05 -07:00
parent b4f061a4b8
commit 7a37a0b8f8
1 changed files with 75 additions and 23 deletions
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98
arch/sparc/kernel/perf_event.c
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@ -710,18 +710,10 @@ static int sparc_perf_event_set_period(struct perf_event *event,
return ret;
}
/* If performance event entries have been added, move existing
* events around (if necessary) and then assign new entries to
* counters.
*/
static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr)
static void read_in_all_counters(struct cpu_hw_events *cpuc)
{
int i;
if (!cpuc->n_added)
goto out;
/* Read in the counters which are moving. */
for (i = 0; i < cpuc->n_events; i++) {
struct perf_event *cp = cpuc->event[i];
@ -732,6 +724,20 @@ static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr)
cpuc->current_idx[i] = PIC_NO_INDEX;
}
}
}
/* On this PMU all PICs are programmed using a single PCR. Calculate
* the combined control register value.
*
* For such chips we require that all of the events have the same
* configuration, so just fetch the settings from the first entry.
*/
static void calculate_single_pcr(struct cpu_hw_events *cpuc)
{
int i;
if (!cpuc->n_added)
goto out;
/* Assign to counters all unassigned events. */
for (i = 0; i < cpuc->n_events; i++) {
@ -747,19 +753,71 @@ static u64 maybe_change_configuration(struct cpu_hw_events *cpuc, u64 pcr)
cpuc->current_idx[i] = idx;
enc = perf_event_get_enc(cpuc->events[i]);
pcr &= ~mask_for_index(idx);
cpuc->pcr[0] &= ~mask_for_index(idx);
if (hwc->state & PERF_HES_STOPPED)
pcr |= nop_for_index(idx);
cpuc->pcr[0] |= nop_for_index(idx);
else
pcr |= event_encoding(enc, idx);
cpuc->pcr[0] |= event_encoding(enc, idx);
}
out:
return pcr;
cpuc->pcr[0] |= cpuc->event[0]->hw.config_base;
}
/* On this PMU each PIC has it's own PCR control register. */
static void calculate_multiple_pcrs(struct cpu_hw_events *cpuc)
{
int i;
if (!cpuc->n_added)
goto out;
for (i = 0; i < cpuc->n_events; i++) {
struct perf_event *cp = cpuc->event[i];
struct hw_perf_event *hwc = &cp->hw;
int idx = hwc->idx;
u64 enc;
if (cpuc->current_idx[i] != PIC_NO_INDEX)
continue;
sparc_perf_event_set_period(cp, hwc, idx);
cpuc->current_idx[i] = idx;
enc = perf_event_get_enc(cpuc->events[i]);
cpuc->pcr[idx] &= ~mask_for_index(idx);
if (hwc->state & PERF_HES_STOPPED)
cpuc->pcr[idx] |= nop_for_index(idx);
else
cpuc->pcr[idx] |= event_encoding(enc, idx);
}
out:
for (i = 0; i < cpuc->n_events; i++) {
struct perf_event *cp = cpuc->event[i];
int idx = cp->hw.idx;
cpuc->pcr[idx] |= cp->hw.config_base;
}
}
/* If performance event entries have been added, move existing events
* around (if necessary) and then assign new entries to counters.
*/
static void update_pcrs_for_enable(struct cpu_hw_events *cpuc)
{
if (cpuc->n_added)
read_in_all_counters(cpuc);
if (sparc_pmu->num_pcrs == 1) {
calculate_single_pcr(cpuc);
} else {
calculate_multiple_pcrs(cpuc);
}
}
static void sparc_pmu_enable(struct pmu *pmu)
{
struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
int i;
if (cpuc->enabled)
return;
@ -767,17 +825,11 @@ static void sparc_pmu_enable(struct pmu *pmu)
cpuc->enabled = 1;
barrier();
if (cpuc->n_events) {
u64 pcr = maybe_change_configuration(cpuc, cpuc->pcr[0]);
if (cpuc->n_events)
update_pcrs_for_enable(cpuc);
/* We require that all of the events have the same
* configuration, so just fetch the settings from the
* first entry.
*/
cpuc->pcr[0] = pcr | cpuc->event[0]->hw.config_base;
}
pcr_ops->write_pcr(0, cpuc->pcr[0]);
for (i = 0; i < sparc_pmu->num_pcrs; i++)
pcr_ops->write_pcr(i, cpuc->pcr[i]);
}
static void sparc_pmu_disable(struct pmu *pmu)