perf/x86/intel/pt: Remove software double buffering PMU capability

Now that all AUX allocations are high-order by default, the software
double buffering PMU capability doesn't make sense any more, get rid
of it. In case some PMUs choose to opt out, we can re-introduce it.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Link: http://lkml.kernel.org/r/20190503085536.24119-3-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 1 insertions, 3 deletions

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index fb3a2f13fc70..339d7628080c 100644
--- a/arch/x86/events/intel/pt.c
+++ b/arch/x86/events/intel/pt.c
@@ -1525,8 +1525,7 @@ static __init int pt_init(void)
         }
 
         if (!intel_pt_validate_hw_cap(PT_CAP_topa_multiple_entries))
-                pt_pmu.pmu.capabilities =
-                        PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_AUX_SW_DOUBLEBUF;
+                pt_pmu.pmu.capabilities = PERF_PMU_CAP_AUX_NO_SG;
 
         pt_pmu.pmu.capabilities |= PERF_PMU_CAP_EXCLUSIVE | PERF_PMU_CAP_ITRACE;
         pt_pmu.pmu.attr_groups           = pt_attr_groups;
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e47ef764f613..1f678f023850 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -240,7 +240,6 @@ struct perf_event;
 #define PERF_PMU_CAP_NO_INTERRUPT               0x01
 #define PERF_PMU_CAP_NO_NMI                     0x02
 #define PERF_PMU_CAP_AUX_NO_SG                  0x04
-#define PERF_PMU_CAP_AUX_SW_DOUBLEBUF           0x08
 #define PERF_PMU_CAP_EXCLUSIVE                  0x10
 #define PERF_PMU_CAP_ITRACE                     0x20
 #define PERF_PMU_CAP_HETEROGENEOUS_CPUS         0x40