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 <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: vince@deater.net
Cc: eranian@google.com
Cc: Adrian Hunter <adrian.hunter@intel.com>
Link: http://lkml.kernel.org/r/20160916134819.1978-1-alexander.shishkin@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2 files changed, 28 insertions, 1 deletions

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,