intel-gpu-overlay: Move local perf implementation to a library

Idea is to avoid duplication across multiple users in
upcoming patches.

v2: Commit message and use a separate library instead of piggy-
    backing to libintel_tools. (Chris Wilson)

v3: Add Petri's meson build recipe.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

4 files changed, 101 insertions, 1 deletions

diff --git a/lib/Makefile.am b/lib/Makefile.am
index 9c511dc0..c3c4a7e3 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -7,7 +7,11 @@ include Makefile.sources
 
 libintel_tools_la_SOURCES = $(lib_source_list)
 
-noinst_LTLIBRARIES = libintel_tools.la
+libigt_perf_la_SOURCES = \
+	igt_perf.c	 \
+	igt_perf.h
+
+noinst_LTLIBRARIES = libintel_tools.la libigt_perf.la
 noinst_HEADERS = check-ndebug.h
 
 if BUILD_VC4
diff --git a/lib/igt_perf.c b/lib/igt_perf.c
new file mode 100644
index 00000000..45cccff0
--- /dev/null
+++ b/lib/igt_perf.c
@@ -0,0 +1,26 @@
+#include <stdint.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+#include "igt_perf.h"
+
+uint64_t i915_type_id(void)
+{
+	char buf[1024];
+	int fd, n;
+
+	fd = open("/sys/bus/event_source/devices/i915/type", 0);
+	if (fd < 0) {
+		n = -1;
+	} else {
+		n = read(fd, buf, sizeof(buf)-1);
+		close(fd);
+	}
+	if (n < 0)
+		return 0;
+
+	buf[n] = '\0';
+	return strtoull(buf, 0, 0);
+}
+
diff --git a/lib/igt_perf.h b/lib/igt_perf.h
new file mode 100644
index 00000000..a80b311c
--- /dev/null
+++ b/lib/igt_perf.h
@@ -0,0 +1,66 @@
+#ifndef I915_PERF_H
+#define I915_PERF_H
+
+#include <stdint.h>
+
+#include <linux/perf_event.h>
+
+#define I915_SAMPLE_BUSY	0
+#define I915_SAMPLE_WAIT	1
+#define I915_SAMPLE_SEMA	2
+
+#define I915_SAMPLE_RCS		0
+#define I915_SAMPLE_VCS		1
+#define I915_SAMPLE_BCS		2
+#define I915_SAMPLE_VECS	3
+
+#define __I915_PERF_COUNT(ring, id) ((ring) << 4 | (id))
+
+#define I915_PERF_COUNT_RCS_BUSY __I915_PERF_COUNT(I915_SAMPLE_RCS, I915_SAMPLE_BUSY)
+#define I915_PERF_COUNT_RCS_WAIT __I915_PERF_COUNT(I915_SAMPLE_RCS, I915_SAMPLE_WAIT)
+#define I915_PERF_COUNT_RCS_SEMA __I915_PERF_COUNT(I915_SAMPLE_RCS, I915_SAMPLE_SEMA)
+
+#define I915_PERF_COUNT_VCS_BUSY __I915_PERF_COUNT(I915_SAMPLE_VCS, I915_SAMPLE_BUSY)
+#define I915_PERF_COUNT_VCS_WAIT __I915_PERF_COUNT(I915_SAMPLE_VCS, I915_SAMPLE_WAIT)
+#define I915_PERF_COUNT_VCS_SEMA __I915_PERF_COUNT(I915_SAMPLE_VCS, I915_SAMPLE_SEMA)
+
+#define I915_PERF_COUNT_BCS_BUSY __I915_PERF_COUNT(I915_SAMPLE_BCS, I915_SAMPLE_BUSY)
+#define I915_PERF_COUNT_BCS_WAIT __I915_PERF_COUNT(I915_SAMPLE_BCS, I915_SAMPLE_WAIT)
+#define I915_PERF_COUNT_BCS_SEMA __I915_PERF_COUNT(I915_SAMPLE_BCS, I915_SAMPLE_SEMA)
+
+#define I915_PERF_COUNT_VECS_BUSY __I915_PERF_COUNT(I915_SAMPLE_VECS, I915_SAMPLE_BUSY)
+#define I915_PERF_COUNT_VECS_WAIT __I915_PERF_COUNT(I915_SAMPLE_VECS, I915_SAMPLE_WAIT)
+#define I915_PERF_COUNT_VECS_SEMA __I915_PERF_COUNT(I915_SAMPLE_VECS, I915_SAMPLE_SEMA)
+
+#define I915_PERF_ACTUAL_FREQUENCY 32
+#define I915_PERF_REQUESTED_FREQUENCY 33
+#define I915_PERF_ENERGY 34
+#define I915_PERF_INTERRUPTS 35
+
+#define I915_PERF_RC6_RESIDENCY		40
+#define I915_PERF_RC6p_RESIDENCY	41
+#define I915_PERF_RC6pp_RESIDENCY	42
+
+static inline int
+perf_event_open(struct perf_event_attr *attr,
+		pid_t pid,
+		int cpu,
+		int group_fd,
+		unsigned long flags)
+{
+#ifndef __NR_perf_event_open
+#if defined(__i386__)
+#define __NR_perf_event_open 336
+#elif defined(__x86_64__)
+#define __NR_perf_event_open 298
+#else
+#define __NR_perf_event_open 0
+#endif
+#endif
+    attr->size = sizeof(*attr);
+    return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags);
+}
+
+uint64_t i915_type_id(void);
+
+#endif /* I915_PERF_H */
diff --git a/lib/meson.build b/lib/meson.build
index 253548dc..1b55943b 100644
--- a/lib/meson.build
+++ b/lib/meson.build
@@ -179,4 +179,8 @@ lib_igt = declare_dependency(link_with : lib_igt_build,
 
 igt_deps = [ lib_igt ] + lib_deps
 
+lib_igt_perf = static_library('igt_perf',
+	['igt_perf.c']
+)
+
 subdir('tests')