powerpc/perf: Add macros for defining event fields & formats

Add two macros which generate functions to extract the relevent bits
from event->attr.config{,1,2}.

EVENT_DEFINE_RANGE() defines an accessor for a range of bits in the
event, as well as a "max" function that gives the maximum value of the
field based on the bit width.

EVENT_DEFINE_RANGE_FORMAT() defines the accessor & max routine and also
a format attribute for use in the PMU's attr_groups.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
[mpe: move to powerpc, ugly but descriptive macro names]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/arch/powerpc/perf/hv-common.h b/arch/powerpc/perf/hv-common.h
index 7e615bd38bca..5d79cecbd73d 100644
--- a/arch/powerpc/perf/hv-common.h
+++ b/arch/powerpc/perf/hv-common.h
@@ -1,6 +1,7 @@
 #ifndef LINUX_POWERPC_PERF_HV_COMMON_H_
 #define LINUX_POWERPC_PERF_HV_COMMON_H_
 
+#include <linux/perf_event.h>
 #include <linux/types.h>
 
 struct hv_perf_caps {
@@ -14,4 +15,22 @@ struct hv_perf_caps {
 
 unsigned long hv_perf_caps_get(struct hv_perf_caps *caps);
 
+
+#define EVENT_DEFINE_RANGE_FORMAT(name, attr_var, bit_start, bit_end)   \
+PMU_FORMAT_ATTR(name, #attr_var ":" #bit_start "-" #bit_end);           \
+EVENT_DEFINE_RANGE(name, attr_var, bit_start, bit_end)
+
+#define EVENT_DEFINE_RANGE(name, attr_var, bit_start, bit_end)  \
+static u64 event_get_##name##_max(void)                                 \
+{                                                                       \
+        BUILD_BUG_ON((bit_start > bit_end)                              \
+                    || (bit_end >= (sizeof(1ull) * 8)));                \
+        return (((1ull << (bit_end - bit_start)) - 1) << 1) + 1;        \
+}                                                                       \
+static u64 event_get_##name(struct perf_event *event)                   \
+{                                                                       \
+        return (event->attr.attr_var >> (bit_start)) &                  \
+                event_get_##name##_max();                               \
+}
+
 #endif