From 8ee83b2ab3d1987cbd80c9f2c6f2b12fed87b51e Mon Sep 17 00:00:00 2001 From: Alexander Shishkin Date: Fri, 16 Sep 2016 16:48:19 +0300 Subject: [PATCH] perf/x86/intel/pt: Add support for PTWRITE and power event tracing The Intel PT facility grew some new functionality: * PTWRITE packet carries the payload of the new PTWRITE instruction that can be used to instrument Intel PT traces with user-supplied data. Packets of this type are only generated if 'ptwrite' capability is set and PTWEn bit is set in the event attribute's config. Flow update packets (FUP) can be generated on PTWRITE packets if FUPonPTW config bit is set. Setting these bits is not allowed if 'ptwrite' capability is not set. * PWRE, PWRX, MWAIT, EXSTOP packets communicate core power management events. These depend on 'power_event_tracing' capability and are enabled by setting PwrEvtEn bit in the event attribute. Extend the driver capabilities and provide the proper sanity checks in the event validation function. [ tglx: Massaged changelog ] Signed-off-by: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: vince@deater.net Cc: eranian@google.com Cc: Adrian Hunter Link: http://lkml.kernel.org/r/20160916134819.1978-1-alexander.shishkin@linux.intel.com Signed-off-by: Thomas Gleixner --- arch/x86/events/intel/pt.c | 24 +++++++++++++++++++++++- arch/x86/events/intel/pt.h | 5 +++++ 2 files changed, 28 insertions(+), 1 deletion(-) diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index 04bb5fb5a8d7..18d18fdda93d 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -69,6 +69,8 @@ static struct pt_cap_desc { PT_CAP(psb_cyc, 0, CR_EBX, BIT(1)), PT_CAP(ip_filtering, 0, CR_EBX, BIT(2)), PT_CAP(mtc, 0, CR_EBX, BIT(3)), + PT_CAP(ptwrite, 0, CR_EBX, BIT(4)), + PT_CAP(power_event_trace, 0, CR_EBX, BIT(5)), PT_CAP(topa_output, 0, CR_ECX, BIT(0)), PT_CAP(topa_multiple_entries, 0, CR_ECX, BIT(1)), PT_CAP(single_range_output, 0, CR_ECX, BIT(2)), @@ -259,10 +261,16 @@ fail: #define RTIT_CTL_MTC (RTIT_CTL_MTC_EN | \ RTIT_CTL_MTC_RANGE) +#define RTIT_CTL_PTW (RTIT_CTL_PTW_EN | \ + RTIT_CTL_FUP_ON_PTW) + #define PT_CONFIG_MASK (RTIT_CTL_TSC_EN | \ RTIT_CTL_DISRETC | \ RTIT_CTL_CYC_PSB | \ - RTIT_CTL_MTC) + RTIT_CTL_MTC | \ + RTIT_CTL_PWR_EVT_EN | \ + RTIT_CTL_FUP_ON_PTW | \ + RTIT_CTL_PTW_EN) static bool pt_event_valid(struct perf_event *event) { @@ -311,6 +319,20 @@ static bool pt_event_valid(struct perf_event *event) return false; } + if (config & RTIT_CTL_PWR_EVT_EN && + !pt_cap_get(PT_CAP_power_event_trace)) + return false; + + if (config & RTIT_CTL_PTW) { + if (!pt_cap_get(PT_CAP_ptwrite)) + return false; + + /* FUPonPTW without PTW doesn't make sense */ + if ((config & RTIT_CTL_FUP_ON_PTW) && + !(config & RTIT_CTL_PTW_EN)) + return false; + } + return true; } diff --git a/arch/x86/events/intel/pt.h b/arch/x86/events/intel/pt.h index efffa4a09f68..53473c21b554 100644 --- a/arch/x86/events/intel/pt.h +++ b/arch/x86/events/intel/pt.h @@ -26,11 +26,14 @@ #define RTIT_CTL_CYCLEACC BIT(1) #define RTIT_CTL_OS BIT(2) #define RTIT_CTL_USR BIT(3) +#define RTIT_CTL_PWR_EVT_EN BIT(4) +#define RTIT_CTL_FUP_ON_PTW BIT(5) #define RTIT_CTL_CR3EN BIT(7) #define RTIT_CTL_TOPA BIT(8) #define RTIT_CTL_MTC_EN BIT(9) #define RTIT_CTL_TSC_EN BIT(10) #define RTIT_CTL_DISRETC BIT(11) +#define RTIT_CTL_PTW_EN BIT(12) #define RTIT_CTL_BRANCH_EN BIT(13) #define RTIT_CTL_MTC_RANGE_OFFSET 14 #define RTIT_CTL_MTC_RANGE (0x0full << RTIT_CTL_MTC_RANGE_OFFSET) @@ -91,6 +94,8 @@ enum pt_capabilities { PT_CAP_psb_cyc, PT_CAP_ip_filtering, PT_CAP_mtc, + PT_CAP_ptwrite, + PT_CAP_power_event_trace, PT_CAP_topa_output, PT_CAP_topa_multiple_entries, PT_CAP_single_range_output, -- 2.30.2