sysfs rps test added

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

tests/Makefile.am

@@ -71,6 +71,7 @@ TESTS_progs = \
 	drm_vma_limiter_gtt \
 	drm_vma_limiter_cached \
 	sysfs_rc6_residency \
+	sysfs_rps \
 	flip_test \
 	gem_wait_render_timeout \
 	gem_ctx_create \

tests/sysfs_rps.c

@@ -0,0 +1,179 @@
+/*
+ * Copyright © 2012 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>
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "drmtest.h"
+
+static bool verbose = false;
+static int origmin, origmax;
+
+#define restore_assert(COND) do { \
+	if (!(COND)) { \
+		writeval(stuff[MIN].filp, origmin); \
+		writeval(stuff[MAX].filp, origmax); \
+		assert(0); \
+	} \
+} while (0);
+
+static const char sysfs_base_path[] = "/sys/class/drm/card%d/gt_%s_freq_mhz";
+enum {
+	CUR,
+	MIN,
+	MAX,
+	RP0,
+	RP1,
+	RPn
+};
+
+struct junk {
+	const char *name;
+	const char *mode;
+	FILE *filp;
+} stuff[] = {
+	{ "cur", "r", NULL }, { "min", "rb+", NULL }, { "max", "rb+", NULL }, { "RP0", "r", NULL }, { "RP1", "r", NULL }, { "RPn", "r", NULL }, { NULL, NULL, NULL }
+};
+
+static int readval(FILE *filp)
+{
+	int val;
+	fflush(filp);
+	rewind(filp);
+	fscanf(filp, "%d", &val);
+	return val;
+}
+
+static void writeval(FILE *filp, int val)
+{
+	rewind(filp);
+	fprintf(filp, "%d", val);
+	fflush(filp);
+}
+
+#define fcur (readval(stuff[CUR].filp))
+#define fmin (readval(stuff[MIN].filp))
+#define fmax (readval(stuff[MAX].filp))
+#define frp0 (readval(stuff[RP0].filp))
+#define frp1 (readval(stuff[RP1].filp))
+#define frpn (readval(stuff[RPn].filp))
+
+static void setfreq(int val)
+{
+	writeval(stuff[MIN].filp, val);
+	writeval(stuff[MAX].filp, val);
+}
+
+static void checkit(void)
+{
+	restore_assert(fmin <= fmax);
+	restore_assert(fcur <= fmax);
+	restore_assert(fmin <= fcur);
+	restore_assert(frpn <= fmin);
+	restore_assert(fmax <= frp0);
+	restore_assert(frp1 <= frp0);
+	restore_assert(frpn <= frp1);
+	restore_assert(frp0 != 0);
+	restore_assert(frp1 != 0);
+}
+
+static void dumpit(void)
+{
+	struct junk *junk = stuff;
+	do {
+		printf("gt frequency %s (MHz):  %d\n", junk->name, readval(junk->filp));
+		junk++;
+	} while(junk->name != NULL);
+
+	printf("\n");
+}
+
+
+int main(int argc, char *argv[])
+{
+	const int device = drm_get_card(0);
+	struct junk *junk = stuff;
+	int fd, ret;
+
+	if (argc > 1)
+		verbose++;
+
+	/* Use drm_open_any to verify device existence */
+	fd = drm_open_any();
+	close(fd);
+
+	do {
+		int val = -1;
+		char *path;
+		ret = asprintf(&path, sysfs_base_path, device, junk->name);
+		assert(ret != -1);
+		junk->filp = fopen(path, junk->mode);
+		if (junk->filp == NULL) {
+			fprintf(stderr, "Kernel is too old. GTFO\n");
+			exit(77);
+		}
+		val = readval(junk->filp);
+		assert(val >= 0);
+		junk++;
+	} while(junk->name != NULL);
+
+	origmin = fmin;
+	origmax = fmax;
+
+	if (verbose)
+		printf("Original min = %d\nOriginal max = %d\n", origmin, origmax);
+
+	if (verbose)
+		dumpit();
+
+	checkit();
+	setfreq(fmin);
+	if (verbose)
+		dumpit();
+	restore_assert(fcur == fmin);
+	setfreq(fmax);
+	if (verbose)
+		dumpit();
+	restore_assert(fcur == fmax);
+	checkit();
+
+	/* And some errors */
+	writeval(stuff[MIN].filp, frpn - 1);
+	writeval(stuff[MAX].filp, frp0 + 1000);
+	checkit();
+
+	writeval(stuff[MIN].filp, fmax + 1000);
+	writeval(stuff[MAX].filp, fmin - 1);
+	checkit();
+
+	writeval(stuff[MIN].filp, origmin);
+	writeval(stuff[MAX].filp, origmax);
+
+	exit(EXIT_SUCCESS);
+}