Support micro operation measurement on arm64

I dropped the version numbers, but this is v4 of Shih-Wei Li's series of the same name, last posted in January. I took the liberty of incorporating all the comments v3 had, plus making some other cleanup tweaks. These tests are too nice to let them slip away, let's get them reviewed and merged.

v2:
- add missing 'L' in 'UL' for PS_PER_SEC. There's a lot of picoseconds in a second!

Thanks,
drew

*** BLURB HERE ***

Shih-Wei Li (2):
arm/arm64: add GICD_IIDR definition
arm64: add micro-bench

 arm/Makefile.arm64 |   1 +
 arm/micro-bench.c  | 213 +++++++++++++++++++++++++++++++++++++++++++++
 arm/unittests.cfg  |   8 ++
 lib/arm/asm/gic.h  |   1 +
 4 files changed, 223 insertions(+)
 create mode 100644 arm/micro-bench.c

2.17.1

From: Shih-Wei Li <[email protected]>

---
 lib/arm/asm/gic.h | 1 +
 1 file changed, 1 insertion(+)

index 2eb4af8d6c81..3b9982b0e7b5 100644
@@ -10,6 +10,7 @@
 /* Distributor registers */
 #define GICD_CTLR			0x0000
 #define GICD_TYPER			0x0004
+#define GICD_IIDR			0x0008
 #define GICD_IGROUPR			0x0080
 #define GICD_ISENABLER			0x0100
 #define GICD_ISPENDR			0x0200

2.17.1

From: Shih-Wei Li <[email protected]>

Here we provide the support for measuring various micro level operations on arm64. Measurements are currently obtained using timer counters. Further modifications in KVM will be required to support timestamping using cycle counters, as KVM now disables accesses to the PMU counters from the VM.

---
 arm/Makefile.arm64 |   1 +
 arm/micro-bench.c  | 213 +++++++++++++++++++++++++++++++++++++++++++++
 arm/unittests.cfg  |   8 ++
 3 files changed, 222 insertions(+)
 create mode 100644 arm/micro-bench.c

index f04bbf476763..637435c523da 100644
@@ -15,6 +15,7 @@ OBJDIRS += lib/arm64
 
 # arm64 specific tests
 tests = $(TEST_DIR)/timer.flat
+tests += $(TEST_DIR)/micro-bench.flat
 
 include $(SRCDIR)/$(TEST_DIR)/Makefile.common
 

index 44b98cfc7afd..5c8a332da004 100644
@@ -116,3 +116,11 @@ file = timer.flat
 groups = timer
 timeout = 2s
 arch = arm64
+
+# Exit tests
+[micro-bench]
+file = micro-bench.flat
+smp = 2
+groups = nodefault,micro-bench
+accel = kvm
+arch = arm64

2.17.1

Numbers look more sane now indeed :)

Thanks,

Christoffer