perf/x86/intel/pt: add new capability for Intel PT

This adds support for "output to Trace Transport subsystem"
capability of Intel PT. It means that PT can output its
trace to an MMIO address range rather than system memory buffer.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Luwei Kang <luwei.kang@intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/events/intel/pt.c

@@ -68,6 +68,7 @@ static struct pt_cap_desc {
 	PT_CAP(topa_output,		0, CPUID_ECX, BIT(0)),
 	PT_CAP(topa_multiple_entries,	0, CPUID_ECX, BIT(1)),
 	PT_CAP(single_range_output,	0, CPUID_ECX, BIT(2)),
+	PT_CAP(output_subsys,		0, CPUID_ECX, BIT(3)),
 	PT_CAP(payloads_lip,		0, CPUID_ECX, BIT(31)),
 	PT_CAP(num_address_ranges,	1, CPUID_EAX, 0x3),
 	PT_CAP(mtc_periods,		1, CPUID_EAX, 0xffff0000),

arch/x86/include/asm/intel_pt.h

@@ -16,6 +16,7 @@ enum pt_capabilities {
 	PT_CAP_topa_output,
 	PT_CAP_topa_multiple_entries,
 	PT_CAP_single_range_output,
+	PT_CAP_output_subsys,
 	PT_CAP_payloads_lip,
 	PT_CAP_num_address_ranges,
 	PT_CAP_mtc_periods,