[Intel-gfx] [PATCH 08/10] intel-gpu-tools/forcewaked: sample forcewake app

[Ben Widawsky]

This app is required for debug features which seem to (undocumented)
reset themselves if/when the GT goes to sleep.

It is also useful for those doing general debugging or profiling from
userspace when they do not wish to have the GT sleep.

v2: made forcewaked more daemon-like

Cc: Chris Wilson <chris at chris-wilson.co.uk>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 tools/Makefile.am  |    1 +
 tools/forcewaked.c |  106 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 107 insertions(+), 0 deletions(-)

diff --git a/tools/Makefile.am b/tools/Makefile.am
index c777778..2a6c82d 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -12,6 +12,7 @@ bin_PROGRAMS = \
 	intel_reg_snapshot \
 	intel_reg_write \
 	intel_reg_read \
+	forcewaked \
 	$(NULL)
 
 noinst_PROGRAMS = \
diff --git a/tools/forcewaked.c b/tools/forcewaked.c
new file mode 100644
index 0000000..3ab2d6f
--- /dev/null
+++ b/tools/forcewaked.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *    Ben Widawsky <ben at bwidawsk.net>
+ *
+ */
+
+#include <assert.h>
+#include <err.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <unistd.h>
+#include "intel_gpu_tools.h"
+
+bool daemonized;
+
+#define INFO_PRINT(...) \
+	do { \
+		if (daemonized) \
+			syslog(LOG_INFO, ##__VA_ARGS__); \
+		else \
+			fprintf(stdout, ##__VA_ARGS__); \
+	} while(0)
+
+static void
+help(char *prog) {
+	printf("%s Prevents the GT from sleeping.\n\n", prog);
+	printf("usage: %s [options] \n\n", prog);
+	printf("Options: \n");
+	printf("    -b        Run in background/daemon mode\n");
+}
+
+static int
+is_alive(void) {
+	/* Read the timestamp, which should *almost* always be !0 */
+	return (intel_register_read(0x2358) != 0);
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+
+	if (argc > 2 || (argc == 2 && !strncmp(argv[1], "-h", 2))) {
+		help(argv[1]);
+		exit(0);
+	}
+
+	if (argc == 2 && (!strncmp(argv[1], "-b", 2)))
+		daemonized = true;
+
+	if (daemonized) {
+		assert(daemon(0, 0) == 0);
+		openlog(argv[0], LOG_CONS | LOG_PID, LOG_USER);
+		INFO_PRINT("started daemon");
+	}
+
+	ret = intel_register_access_init(intel_get_pci_device(), 1);
+	if (ret) {
+		INFO_PRINT("Couldn't init register access\n");
+		exit(1);
+	} else {
+		INFO_PRINT("Forcewake locked\n");
+	}
+	while(1) {
+		if (!is_alive()) {
+			INFO_PRINT("gpu reset? restarting daemon\n");
+			intel_register_access_fini();
+			ret = intel_register_access_init(intel_get_pci_device(),
+							 1);
+		}
+		sleep(1);
+	}
+	intel_register_access_fini();
+	INFO_PRINT("Forcewake unlock\n");
+
+	if (daemonized) {
+		INFO_PRINT("finished\n");
+		closelog();
+	}
+
+	return 0;
+}
-- 
1.7.6