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sparc64: Add initial perf event conflict resolution and checks.

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Cribbed from powerpc code, as usual. :-)

Currently it is only used to validate that all counters
have the same user/kernel/hv attributes.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2009-09-27 20:43:07 -07:00
parent 7eebda60d5
commit 01552f765c
1 changed files with 77 additions and 5 deletions
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82
arch/sparc/kernel/perf_event.c
View file

@ -713,12 +713,66 @@ static void hw_perf_event_destroy(struct perf_event *event)
perf_event_release_pmc();
}
static int check_excludes(struct perf_event **evts, int n_prev, int n_new)
{
int eu = 0, ek = 0, eh = 0;
struct perf_event *event;
int i, n, first;
n = n_prev + n_new;
if (n <= 1)
return 0;
first = 1;
for (i = 0; i < n; i++) {
event = evts[i];
if (first) {
eu = event->attr.exclude_user;
ek = event->attr.exclude_kernel;
eh = event->attr.exclude_hv;
first = 0;
} else if (event->attr.exclude_user != eu ||
event->attr.exclude_kernel != ek ||
event->attr.exclude_hv != eh) {
return -EAGAIN;
}
}
return 0;
}
static int collect_events(struct perf_event *group, int max_count,
struct perf_event *evts[], u64 *events)
{
struct perf_event *event;
int n = 0;
if (!is_software_event(group)) {
if (n >= max_count)
return -1;
evts[n] = group;
events[n++] = group->hw.config;
}
list_for_each_entry(event, &group->sibling_list, group_entry) {
if (!is_software_event(event) &&
event->state != PERF_EVENT_STATE_OFF) {
if (n >= max_count)
return -1;
evts[n] = event;
events[n++] = event->hw.config;
}
}
return n;
}
static int __hw_perf_event_init(struct perf_event *event)
{
struct perf_event_attr *attr = &event->attr;
struct perf_event *evts[MAX_HWEVENTS];
struct hw_perf_event *hwc = &event->hw;
const struct perf_event_map *pmap;
u64 enc;
u64 enc, events[MAX_HWEVENTS];
int n;
if (atomic_read(&nmi_active) < 0)
return -ENODEV;
@ -734,9 +788,6 @@ static int __hw_perf_event_init(struct perf_event *event)
} else
return -EOPNOTSUPP;
perf_event_grab_pmc();
event->destroy = hw_perf_event_destroy;
/* We save the enable bits in the config_base. So to
* turn off sampling just write 'config', and to enable
* things write 'config | config_base'.
@ -749,13 +800,34 @@ static int __hw_perf_event_init(struct perf_event *event)
if (!attr->exclude_hv)
hwc->config_base |= sparc_pmu->hv_bit;
enc = pmap->encoding;
n = 0;
if (event->group_leader != event) {
n = collect_events(event->group_leader,
perf_max_events - 1,
evts, events);
if (n < 0)
return -EINVAL;
}
events[n] = enc;
evts[n] = event;
if (check_excludes(evts, n, 1))
return -EINVAL;
/* Try to do all error checking before this point, as unwinding
* state after grabbing the PMC is difficult.
*/
perf_event_grab_pmc();
event->destroy = hw_perf_event_destroy;
if (!hwc->sample_period) {
hwc->sample_period = MAX_PERIOD;
hwc->last_period = hwc->sample_period;
atomic64_set(&hwc->period_left, hwc->sample_period);
}
enc = pmap->encoding;
if (pmap->pic_mask & PIC_UPPER) {
hwc->idx = PIC_UPPER_INDEX;
enc <<= sparc_pmu->upper_shift;