fb: add missing viv_gpu_top.c

Doesn't actually work yet, but this fixes the build.

.gitignore

@@ -4,4 +4,5 @@
 *.fdr
 *.swp
 *.so
+tags
 

native/fb/viv_gpu_top.c

@@ -0,0 +1,79 @@
+/* Watch usage of Vivante GPU live.
+ * Needs profiling support built-in.
+ *
+ * XXX work in progress.
+ */
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+#include <etnaviv/viv.h>
+#include <etnaviv/viv_profile.h>
+
+static const char *bars[] = {
+	" ",
+	"▏",
+	"▎",
+	"▍",
+	"▌",
+	"▋",
+	"▊",
+	"▉",
+	"█"
+};
+
+static unsigned long gettime(void)
+{
+    struct timeval t;
+    gettimeofday(&t, NULL);
+    return (t.tv_usec + (t.tv_sec * 1000000));
+}
+
+int main()
+{
+    struct viv_conn *conn = 0;
+    int rv;
+    rv = viv_open(VIV_HW_3D, &conn);
+    if(rv!=0)
+    {
+        fprintf(stderr, "Error opening device\n");
+        exit(1);
+    }
+    uint32_t num_profile_counters = viv_get_num_profile_counters();
+
+    /* Need to figure out which timers are persistent and
+     * which ones reset after querying.
+     */
+
+    uint32_t *counter_data = calloc(num_profile_counters, 4);
+    if(viv_read_profile_counters_3d(conn, counter_data) != 0)
+    {
+        fprintf(stderr, "Error querying counters (probably unsupported with this kernel, or not built into libetnaviv)\n");
+        exit(1);
+    }
+    for(uint32_t c=0; c<num_profile_counters; ++c)
+    {
+        struct viv_profile_counter_info *info = viv_get_profile_counter_info(c);
+        printf("[%d] %s %u\n", c, info->name, counter_data[c]);
+    }
+    /*
+     * Sort list of counters by activity /s
+     * Show number per second
+     * Show minimum
+     * Show maximum
+     * Show a bar, based on current activity percentage of maximum (and some pre-determined value, to prevent 
+     * everything from hanging at max)
+     */
+
+    return 0;
+}
+