read_dawr_perf_interface

Add new test cases for reading single DAWR register and
multiple DAWR registers with perf interface

Signed-off-by: Akanksha J N <akanksha@linux.ibm.com>

trace/dawr.py

@@ -19,7 +19,7 @@
 import shutil
 import pexpect
 from avocado import Test
-from avocado.utils import build, distro, cpu
+from avocado.utils import build, distro, cpu, process
 from avocado.utils.software_manager.manager import SoftwareManager
 
 
@@ -33,15 +33,15 @@ class Dawr(Test):
 
     def setUp(self):
         '''
-        Install the basic packages to support gdb
+        Install the basic packages to support gdb and perf
         '''
         if "power10" not in cpu.get_family():
             self.cancel("Test is supported only on IBM POWER10 platform")
         # Check for basic utilities
         smm = SoftwareManager()
         self.detected_distro = distro.detect()
         self.distro_name = self.detected_distro.name
-        deps = ['gcc', 'make', 'gdb']
+        deps = ['gcc', 'make', 'gdb', 'perf']
         for package in deps:
             if not smm.check_installed(package) and not smm.install(package):
                 self.cancel('%s is needed for the test to be run' % package)
@@ -53,6 +53,7 @@ def setUp(self):
                         os.path.join(self.teststmpdir, 'Makefile'))
         build.make(self.teststmpdir)
         os.chdir(self.teststmpdir)
+        self.output_file = "perf.data"
 
     def run_cmd(self, bin_var):
         child = pexpect.spawn('gdb ./%s' % bin_var, encoding='utf-8')
@@ -62,7 +63,30 @@ def run_cmd(self, bin_var):
         return_value = []
         return child, return_value
 
-    def test_read_dawr_v1(self):
+    def run_test(self, cmd):
+        return process.run(cmd, shell=True)
+
+    def perf_cmd(self, perf_record):
+        process.run(perf_record, shell=True, ignore_status=True,
+                    verbose=True, ignore_bg_processes=True)
+        report = "perf report --input=%s" % self.output_file
+        self.run_test(report)
+        if not os.stat(self.output_file).st_size:
+            self.fail("%s sample not captured" % self.output_file)
+
+    def address_v1(self):
+        # Get memory address of single variable
+        output = self.run_test('./dawr_v1')
+        data = output.stdout.decode("utf-8")
+        return data
+
+    def address_v2(self):
+        # Get memory address of two variables
+        output = self.run_test('./dawr_v2')
+        data = output.stdout.decode("utf-8").split(',')
+        return data
+
+    def test_read_dawr_v1_gdb(self):
         """
         Setting Read/Write watchpoint on single variable using awatch and
         executing the program
@@ -81,7 +105,7 @@ def test_read_dawr_v1(self):
             if i != 0:
                 self.fail('Test case failed for 1 variable')
 
-    def test_read_dawr_v2(self):
+    def test_read_dawr_v2_gdb(self):
         """
         Setting Read/Write watchpoints on two variables using awatch and
         executing the program
@@ -106,7 +130,7 @@ def test_read_dawr_v2(self):
             if i == 0:
                 self.fail('Test case failed for 2 variables')
 
-    def test_read_dawr_v3(self):
+    def test_read_dawr_v3_gdb(self):
         """
         Setting Read/Write watchpoints on three variables using awatch and
         executing the program
@@ -121,7 +145,26 @@ def test_read_dawr_v3(self):
                                                     % (i, value)]))
         child.sendline('r')
         return_value.append(child.expect_exact([pexpect.TIMEOUT,
-                                                'not enough available hardware']))
+                                       'not enough available hardware']))
         for i in return_value:
             if i == 0:
                 self.fail('Test case failed for 3 variables')
+
+    def test_read_dawr_v1_perf(self):
+        # Read single dawr register with perf interface
+        data = self.address_v1()
+        perf_record = 'perf record -o %s -e mem:%s ./dawr_v1' % (
+            self.output_file, data)
+        self.perf_cmd(perf_record)
+
+    def test_read_dawr_v2_perf(self):
+        # Read two dawr registers with perf interface
+        data = self.address_v2()
+        perf_record = 'perf record -o %s -e mem:%s -e mem:%s ./dawr_v2' % (
+            self.output_file, data[0], data[1][1:11])
+        self.perf_cmd(perf_record)
+
+    def tearDown(self):
+        # Delete the temporary file
+        if os.path.isfile("perf.data"):
+            process.run('rm -f perf.data')