From: Alexander Shishkin Date: Wed, 26 Jan 2022 10:48:15 +0000 (+0200) Subject: perf/x86/intel/pt: Add a capability and config bit for disabling TNTs X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=161a9a33702a2e65a4118dacb449505ac8ce3122;p=linux.git perf/x86/intel/pt: Add a capability and config bit for disabling TNTs As of Intel SDM (https://www.intel.com/sdm) version 076, there is a new Intel PT feature called TNT-Disable which is enabled config bit 55. TNT-Disable disables Taken-Not-Taken packets to reduce the tracing overhead, but with the result that exact control flow information is lost. Add a capability and config bit for TNT-Disable. Signed-off-by: Alexander Shishkin Signed-off-by: Adrian Hunter Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Adrian Hunter Link: https://lore.kernel.org/r/20220126104815.2807416-3-adrian.hunter@intel.com --- diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index f339c88d17f91..aa66c0c7b18bc 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -60,6 +60,7 @@ static struct pt_cap_desc { PT_CAP(ptwrite, 0, CPUID_EBX, BIT(4)), PT_CAP(power_event_trace, 0, CPUID_EBX, BIT(5)), PT_CAP(event_trace, 0, CPUID_EBX, BIT(7)), + PT_CAP(tnt_disable, 0, CPUID_EBX, BIT(8)), 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)), @@ -112,6 +113,7 @@ PMU_FORMAT_ATTR(noretcomp, "config:11" ); PMU_FORMAT_ATTR(ptw, "config:12" ); PMU_FORMAT_ATTR(branch, "config:13" ); PMU_FORMAT_ATTR(event, "config:31" ); +PMU_FORMAT_ATTR(notnt, "config:55" ); PMU_FORMAT_ATTR(mtc_period, "config:14-17" ); PMU_FORMAT_ATTR(cyc_thresh, "config:19-22" ); PMU_FORMAT_ATTR(psb_period, "config:24-27" ); @@ -121,6 +123,7 @@ static struct attribute *pt_formats_attr[] = { &format_attr_cyc.attr, &format_attr_pwr_evt.attr, &format_attr_event.attr, + &format_attr_notnt.attr, &format_attr_fup_on_ptw.attr, &format_attr_mtc.attr, &format_attr_tsc.attr, @@ -302,6 +305,7 @@ fail: RTIT_CTL_MTC | \ RTIT_CTL_PWR_EVT_EN | \ RTIT_CTL_EVENT_EN | \ + RTIT_CTL_NOTNT | \ RTIT_CTL_FUP_ON_PTW | \ RTIT_CTL_PTW_EN) @@ -360,6 +364,10 @@ static bool pt_event_valid(struct perf_event *event) !intel_pt_validate_hw_cap(PT_CAP_event_trace)) return false; + if (config & RTIT_CTL_NOTNT && + !intel_pt_validate_hw_cap(PT_CAP_tnt_disable)) + return false; + if (config & RTIT_CTL_PTW) { if (!intel_pt_validate_hw_cap(PT_CAP_ptwrite)) return false; diff --git a/arch/x86/include/asm/intel_pt.h b/arch/x86/include/asm/intel_pt.h index d1ef9cb588474..c796e9bc98b6c 100644 --- a/arch/x86/include/asm/intel_pt.h +++ b/arch/x86/include/asm/intel_pt.h @@ -14,6 +14,7 @@ enum pt_capabilities { PT_CAP_ptwrite, PT_CAP_power_event_trace, PT_CAP_event_trace, + PT_CAP_tnt_disable, PT_CAP_topa_output, PT_CAP_topa_multiple_entries, PT_CAP_single_range_output, diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 79b392d893e31..efd34cfa17200 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -206,6 +206,7 @@ #define RTIT_CTL_PTW_EN BIT(12) #define RTIT_CTL_BRANCH_EN BIT(13) #define RTIT_CTL_EVENT_EN BIT(31) +#define RTIT_CTL_NOTNT BIT_ULL(55) #define RTIT_CTL_MTC_RANGE_OFFSET 14 #define RTIT_CTL_MTC_RANGE (0x0full << RTIT_CTL_MTC_RANGE_OFFSET) #define RTIT_CTL_CYC_THRESH_OFFSET 19