vtest: use a poll fd if possible

For the same glmark2 "build" test, perf reports about half
instructions.

Signed-off-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

vtest/Makefile.am

@@ -15,6 +15,8 @@ AM_CFLAGS = \
 bin_PROGRAMS = virgl_test_server
 
 virgl_test_server_SOURCES =			\
+	util.c					\
+	util.h					\
 	vtest_server.c				\
 	vtest_renderer.c			\
 	vtest_protocol.h			\

vtest/util.c

@@ -0,0 +1,46 @@
+/**************************************************************************
+ *
+ * Copyright (C) 2016 Red Hat Inc.
+ *
+ * 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 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.
+ *
+ **************************************************************************/
+#include "util.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int vtest_wait_for_fd_read(int fd)
+{
+   fd_set read_fds;
+
+   int ret;
+   FD_ZERO(&read_fds);
+   FD_SET(fd, &read_fds);
+
+   ret = select(fd + 1, &read_fds, NULL, NULL, NULL);
+   if (ret < 0)
+      return ret;
+
+   if (FD_ISSET(fd, &read_fds)) {
+      return 0;
+   }
+   return -1;
+}

vtest/util.h

@@ -0,0 +1,29 @@
+/**************************************************************************
+ *
+ * Copyright (C) 2016 Red Hat Inc.
+ *
+ * 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 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.
+ *
+ **************************************************************************/
+#ifndef VTEST_UTIL_H
+#define VTEST_UTIL_H
+
+int vtest_wait_for_fd_read(int fd);
+
+#endif /* VTEST_UTIL_H */

vtest/vtest_renderer.c

@@ -30,6 +30,7 @@
 #include <sys/uio.h>
 #include "vtest.h"
 #include "vtest_protocol.h"
+#include "util.h"
 
 static int ctx_id = 1;
 static int fence_id = 1;
@@ -307,7 +308,7 @@ int vtest_transfer_put(uint32_t length_dw)
 int vtest_resource_busy_wait(void)
 {
   uint32_t bw_buf[VCMD_BUSY_WAIT_SIZE];
-  int ret;
+  int ret, fd;
   int flags;
   uint32_t hdr_buf[VTEST_HDR_SIZE];
   uint32_t reply_buf[1];
@@ -321,10 +322,13 @@ int vtest_resource_busy_wait(void)
 
   if (flags == VCMD_BUSY_WAIT_FLAG_WAIT) {
     do {
-      if (last_fence != (fence_id - 1))
-	virgl_renderer_poll();
-      else
+       if (last_fence == (fence_id - 1))
           break;
+
+       fd = virgl_renderer_get_poll_fd();
+       if (fd != -1)
+          vtest_wait_for_fd_read(fd);
+       virgl_renderer_poll();
     } while (1);
     busy = false;
   } else {

vtest/vtest_server.c

@@ -31,6 +31,7 @@
 #include <netinet/in.h>
 #include <sys/un.h>
 
+#include "util.h"
 #include "vtest.h"
 #include "vtest_protocol.h"
 
@@ -84,24 +85,6 @@ int wait_for_socket_accept(int sock)
     return -1;
 }
 
-int wait_for_socket_read(int sock)
-{
-    fd_set read_fds;
-
-    int ret;
-    FD_ZERO(&read_fds);
-    FD_SET(sock, &read_fds);
-
-    ret = select(sock + 1, &read_fds, NULL, NULL, NULL);
-    if (ret < 0)
-	return ret;
-
-    if (FD_ISSET(sock, &read_fds)) {
-      return 0;
-    }
-    return -1;
-}
-
 int run_renderer(int new_fd)
 {
     int ret;
@@ -109,7 +92,7 @@ int run_renderer(int new_fd)
     bool do_fence;
     bool inited = false;
 again:
-    ret = wait_for_socket_read(new_fd);
+    ret = vtest_wait_for_fd_read(new_fd);
     if (ret < 0)
       goto fail;