@@ -12,6 +12,7 @@ bin_PROGRAMS = \
intel_reg_snapshot \
intel_reg_write \
intel_reg_read \
+ forcewaked \
$(NULL)
noinst_PROGRAMS = \
new file mode 100644
@@ -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@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;
+}
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@chris-wilson.co.uk> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> --- tools/Makefile.am | 1 + tools/forcewaked.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 107 insertions(+), 0 deletions(-)