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>

diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c
index fb3a2f1..339d762 100644 (file)
--- 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 e47ef76..1f678f0 100644 (file)
--- 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