3 files changed, 35 insertions, 1 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index c8ba627c1d60..2e069d1288df 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -584,6 +584,10 @@ struct perf_sample_data {
         struct perf_regs_user           regs_user;
         u64                             stack_user_size;
         u64                             weight;
+        /*
+         * Transaction flags for abort events:
+         */
+        u64                             txn;
 };
 
 static inline void perf_sample_data_init(struct perf_sample_data *data,
@@ -599,6 +603,7 @@ static inline void perf_sample_data_init(struct perf_sample_data *data,
         data->stack_user_size = 0;
         data->weight = 0;
         data->data_src.val = 0;
+        data->txn = 0;
 }
 
 extern void perf_output_sample(struct perf_output_handle *handle,
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 009a655a5d35..da48837d617d 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -136,8 +136,9 @@ enum perf_event_sample_format {
         PERF_SAMPLE_WEIGHT                      = 1U << 14,
         PERF_SAMPLE_DATA_SRC                    = 1U << 15,
         PERF_SAMPLE_IDENTIFIER                  = 1U << 16,
+        PERF_SAMPLE_TRANSACTION                 = 1U << 17,
 
-        PERF_SAMPLE_MAX = 1U << 17,             /* non-ABI */
+        PERF_SAMPLE_MAX = 1U << 18,             /* non-ABI */
 };
 
 /*
@@ -181,6 +182,28 @@ enum perf_sample_regs_abi {
 };
 
 /*
+ * Values for the memory transaction event qualifier, mostly for
+ * abort events. Multiple bits can be set.
+ */
+enum {
+        PERF_TXN_ELISION        = (1 << 0), /* From elision */
+        PERF_TXN_TRANSACTION    = (1 << 1), /* From transaction */
+        PERF_TXN_SYNC           = (1 << 2), /* Instruction is related */
+        PERF_TXN_ASYNC          = (1 << 3), /* Instruction not related */
+        PERF_TXN_RETRY          = (1 << 4), /* Retry possible */
+        PERF_TXN_CONFLICT       = (1 << 5), /* Conflict abort */
+        PERF_TXN_CAPACITY_WRITE = (1 << 6), /* Capacity write abort */
+        PERF_TXN_CAPACITY_READ  = (1 << 7), /* Capacity read abort */
+
+        PERF_TXN_MAX            = (1 << 8), /* non-ABI */
+
+        /* bits 32..63 are reserved for the abort code */
+
+        PERF_TXN_ABORT_MASK  = (0xffffffffULL << 32),
+        PERF_TXN_ABORT_SHIFT = 32,
+};
+
+/*
  * The format of the data returned by read() on a perf event fd,
  * as specified by attr.read_format:
  *
diff --git a/kernel/events/core.c b/kernel/events/core.c
index b25d65ce7106..c716385f6483 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -1201,6 +1201,9 @@ static void perf_event__header_size(struct perf_event *event)
         if (sample_type & PERF_SAMPLE_DATA_SRC)
                 size += sizeof(data->data_src.val);
 
+        if (sample_type & PERF_SAMPLE_TRANSACTION)
+                size += sizeof(data->txn);
+
         event->header_size = size;
 }
 
@@ -4572,6 +4575,9 @@ void perf_output_sample(struct perf_output_handle *handle,
         if (sample_type & PERF_SAMPLE_DATA_SRC)
                 perf_output_put(handle, data->data_src.val);
 
+        if (sample_type & PERF_SAMPLE_TRANSACTION)
+                perf_output_put(handle, data->txn);
+
         if (!event->attr.watermark) {
                 int wakeup_events = event->attr.wakeup_events;