From f3ac72f9093298f7ea6354f0a81c85606eb4a13f Mon Sep 17 00:00:00 2001
From: Norman Feske <norman.feske@genode-labs.com>
Date: Thu, 19 Jul 2012 14:49:29 +0200
Subject: [PATCH] Simple SD card driver benchmarking program

---
 os/run/sd_card_bench.run                     |  60 ++++++++++
 os/src/drivers/sd_card/omap4/bench/main.cc   | 118 +++++++++++++++++++
 os/src/drivers/sd_card/omap4/bench/target.mk |   5 +
 3 files changed, 183 insertions(+)
 create mode 100644 os/run/sd_card_bench.run
 create mode 100644 os/src/drivers/sd_card/omap4/bench/main.cc
 create mode 100644 os/src/drivers/sd_card/omap4/bench/target.mk

diff --git a/os/run/sd_card_bench.run b/os/run/sd_card_bench.run
new file mode 100644
index 000000000..775199205
--- /dev/null
+++ b/os/run/sd_card_bench.run
@@ -0,0 +1,60 @@
+#
+# Build
+#
+
+build  {
+	core init
+	drivers/timer
+	drivers/sd_card
+}
+
+create_boot_directory
+
+
+#
+# Config
+#
+
+install_config {
+	<config>
+		<parent-provides>
+			<service name="ROM"/>
+			<service name="RAM"/>
+			<service name="IRQ"/>
+			<service name="IO_MEM"/>
+			<service name="CAP"/>
+			<service name="PD"/>
+			<service name="RM"/>
+			<service name="CPU"/>
+			<service name="LOG"/>
+			<service name="SIGNAL"/>
+		</parent-provides>
+		<default-route>
+			<any-service> <parent/> <any-child/> </any-service>
+		</default-route>
+
+		<start name="timer">
+			<resource name="RAM" quantum="1M"/>
+			<provides><service name="Timer"/></provides>
+		</start>
+		<start name="sd_card_bench">
+			<resource name="RAM" quantum="16M"/>
+			<provides><service name="Block"/></provides>
+		</start>
+	</config>
+}
+
+
+#
+# Boot modules
+#
+
+build_boot_image {
+	core init
+	timer
+	sd_card_bench
+}
+
+run_genode_until forever
+
+# vi: set ft=tcl :
diff --git a/os/src/drivers/sd_card/omap4/bench/main.cc b/os/src/drivers/sd_card/omap4/bench/main.cc
new file mode 100644
index 000000000..3db3993d3
--- /dev/null
+++ b/os/src/drivers/sd_card/omap4/bench/main.cc
@@ -0,0 +1,118 @@
+/*
+ * \brief  SD-card benchmark OMAP4 platform
+ * \author Norman Feske
+ * \date   2012-07-19
+ */
+
+/* Genode includes */
+#include <base/sleep.h>
+#include <base/printf.h>
+#include <timer_session/connection.h>
+
+/* local includes */
+#include <driver.h>
+
+
+class Jiffies_thread : Genode::Thread<4096>
+{
+	private:
+
+		Timer::Connection    _timer;
+		Genode::Lock mutable _lock;
+		Genode::size_t       _milliseconds;
+
+		enum { MS_PER_STEP = 10 };
+
+		void entry()
+		{
+			for (;;) {
+				_timer.msleep(MS_PER_STEP);
+				{
+					Genode::Lock::Guard guard(_lock);
+					_milliseconds += MS_PER_STEP;
+				}
+			}
+		}
+
+	public:
+
+		Jiffies_thread() : _milliseconds(0) { start(); }
+
+		Genode::size_t milliseconds() const
+		{
+			Genode::Lock::Guard guard(_lock);
+			return _milliseconds;
+		}
+
+		void reset()
+		{
+			Genode::Lock::Guard guard(_lock);
+			_milliseconds = 0;
+		}
+};
+
+
+/*
+ * \param total_size    total number of bytes to read
+ * \param request_size  number of bytes per request
+ */
+static void test_read(Block::Driver &driver,
+                      Jiffies_thread &jiffies,
+                      char          *out_buffer,
+                      Genode::size_t total_size,
+                      Genode::size_t request_size)
+{
+	using namespace Genode;
+
+	PLOG("read: request_size=%zd bytes", request_size);
+
+	jiffies.reset();
+
+	size_t num_requests = total_size / request_size;
+
+	for (size_t i = 0; i < num_requests; i++)
+	{
+		size_t const block_count  = request_size / driver.block_size();
+		addr_t const block_number = i*block_count;
+
+		driver.read(block_number, block_count, out_buffer + i*request_size);
+	}
+
+	size_t const duration_ms = jiffies.milliseconds();
+
+	/*
+	 * Convert bytes per milliseconds to kilobytes per seconds
+	 *
+	 * (total_size / 1024) / (duration_ms / 1000)
+	 */
+	size_t const total_size_kb = total_size / 1024;
+	size_t const throughput_kb_per_sec = (1000*total_size_kb) / duration_ms;
+
+	PLOG("      -> duration:   %zd ms", duration_ms);
+	PLOG("         throughput: %zd KiB/sec", throughput_kb_per_sec);
+}
+
+
+int main(int argc, char **argv)
+{
+	using namespace Genode;
+
+	printf("--- OMAP4 SD card benchmark ---\n");
+
+	static Block::Omap4_driver driver;
+	static Jiffies_thread jiffies;
+
+	long const block_sizes[] = {
+		512, 1024, 2048, 4096, 8192, 16384, 32768, 0 };
+
+	enum { TOTAL_SIZE = 10*1024*1024 };
+
+	static char buffer[TOTAL_SIZE];
+
+	for (unsigned i = 0; block_sizes[i]; i++)
+		test_read(driver, jiffies, buffer, TOTAL_SIZE, block_sizes[i]);
+
+	printf("--- OMAP4 SD card benchmark finished ---\n");
+	sleep_forever();
+	return 0;
+}
diff --git a/os/src/drivers/sd_card/omap4/bench/target.mk b/os/src/drivers/sd_card/omap4/bench/target.mk
new file mode 100644
index 000000000..61c77f578
--- /dev/null
+++ b/os/src/drivers/sd_card/omap4/bench/target.mk
@@ -0,0 +1,5 @@
+TARGET   = sd_card_bench
+REQUIRES = omap4
+SRC_CC   = main.cc
+LIBS     = cxx env signal
+INC_DIR += $(PRG_DIR)/..