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perf, pt, coresight: Fix address filters for vmas with non-zero offset

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Currently, the address range calculation for file-based filters works as
long as the vma that maps the matching part of the object file starts
from offset zero into the file (vm_pgoff==0). Otherwise, the resulting
filter range would be off by vm_pgoff pages. Another related problem is
that in case of a partially matching vma, that is, a vma that matches
part of a filter region, the filter range size wouldn't be adjusted.

Fix the arithmetics around address filter range calculations, taking
into account vma offset, so that the entire calculation is done before
the filter configuration is passed to the PMU drivers instead of having
those drivers do the final bit of arithmetics.

Based on the patch by Adrian Hunter <adrian.hunter.intel.com>.

Reported-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Fixes: 375637bc52 ("perf/core: Introduce address range filtering")
Link: http://lkml.kernel.org/r/20190215115655.63469-3-alexander.shishkin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexander Shishkin
2019-02-15 13:56:55 +02:00
committed by Arnaldo Carvalho de Melo
parent 18736eef12
commit c60f83b813
4 changed files with 62 additions and 42 deletions
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9
arch/x86/events/intel/pt.c
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@@ -1223,7 +1223,8 @@ static int pt_event_addr_filters_validate(struct list_head *filters)
static void pt_event_addr_filters_sync(struct perf_event *event)
{
struct perf_addr_filters_head *head = perf_event_addr_filters(event);
unsigned long msr_a, msr_b, *offs = event->addr_filters_offs;
unsigned long msr_a, msr_b;
struct perf_addr_filter_range *fr = event->addr_filter_ranges;
struct pt_filters *filters = event->hw.addr_filters;
struct perf_addr_filter *filter;
int range = 0;
@@ -1232,12 +1233,12 @@ static void pt_event_addr_filters_sync(struct perf_event *event)
return;
list_for_each_entry(filter, &head->list, entry) {
if (filter->path.dentry && !offs[range]) {
if (filter->path.dentry && !fr[range].start) {
msr_a = msr_b = 0;
} else {
/* apply the offset */
msr_a = filter->offset + offs[range];
msr_b = filter->size + msr_a - 1;
msr_a = fr[range].start;
msr_b = msr_a + fr[range].size - 1;
}
filters->filter[range].msr_a = msr_a;