[PATCH i-g-t v11 01/21] lib/sw_sync: Add helper functions for managing synchronization primitives

[Robert Foss <robert.foss@collabora.com>]

Base functions to help testing the Sync File Framework (explicit fencing
mechanism ported from Android).
These functions allow you to create, use and destroy timelines and fences.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
 lib/Makefile.sources |   2 +
 lib/sw_sync.c        | 214 +++++++++++++++++++++++++++++++++++++++++++++++++++
 lib/sw_sync.h        |  44 +++++++++++
 3 files changed, 260 insertions(+)
 create mode 100644 lib/sw_sync.c
 create mode 100644 lib/sw_sync.h

diff --git a/lib/Makefile.sources b/lib/Makefile.sources
index 602e3f68..53fdb54c 100644
--- a/lib/Makefile.sources
+++ b/lib/Makefile.sources
@@ -63,6 +63,8 @@ lib_source_list =	 	\
 	rendercopy_gen8.c	\
 	rendercopy_gen9.c	\
 	rendercopy.h		\
+	sw_sync.c		\
+	sw_sync.h		\
 	intel_reg_map.c		\
 	intel_iosf.c		\
 	igt_kms.c		\
diff --git a/lib/sw_sync.c b/lib/sw_sync.c
new file mode 100644
index 00000000..aa8feefe
--- /dev/null
+++ b/lib/sw_sync.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright © 2016 Collabora, Ltd.
+ *
+ * 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:
+ *    Robert Foss <robert.foss@collabora.com>
+ */
+
+#ifndef ANDROID
+#define _GNU_SOURCE
+#else
+#include <libgen.h>
+#endif
+#include <fcntl.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <linux/sync_file.h>
+#include <sys/ioctl.h>
+
+#include "igt_debugfs.h"
+#include "sw_sync.h"
+#include "drmtest.h"
+#include "ioctl_wrappers.h"
+
+#ifndef SW_SYNC_IOC_INC
+struct sw_sync_create_fence_data {
+	__u32	value;
+	char	name[32];
+	__s32	fence;
+};
+
+#define LOCAL_SW_SYNC_IOC_MAGIC		    'W'
+#define LOCAL_SW_SYNC_IOC_CREATE_FENCE	_IOWR(LOCAL_SW_SYNC_IOC_MAGIC, 0,\
+						                        struct sw_sync_create_fence_data)
+#define LOCAL_SW_SYNC_IOC_INC			_IOW(LOCAL_SW_SYNC_IOC_MAGIC, 1, __u32)
+#endif
+
+
+static bool kernel_sw_sync_path(char *path, int length)
+{
+	snprintf(path, length, "%s", "/dev/sw_sync");
+	if (access(path, R_OK | W_OK) == 0) {
+	    return true;
+	}
+
+	snprintf(path, length, "%s", "/sys/kernel/debug/sync/sw_sync");
+	if (access(path, R_OK | W_OK) == 0) {
+	    return true;
+	}
+
+	snprintf(path, length, "%s/sw_sync", igt_debugfs_mount());
+	if (access(path, R_OK | W_OK) == 0) {
+	    return true;
+	}
+
+    return false;
+}
+
+static bool sw_sync_fd_is_valid(int fd)
+{
+	int status;
+
+	if (fd < 0)
+		return 0;
+
+	status = fcntl(fd, F_GETFD, 0);
+	return status >= 0;
+}
+
+int sw_sync_timeline_create(void)
+{
+	char buf[128];
+	int fd;
+
+	igt_assert_f(kernel_sw_sync_path(buf, sizeof(buf)),
+	    "Unable to find valid path for sw_sync\n");
+
+	fd = open(buf, O_RDWR);
+	igt_assert_f(sw_sync_fd_is_valid(fd), "Created invalid timeline\n");
+
+	return fd;
+}
+
+int __sw_sync_fence_create(int fd, uint32_t seqno)
+{
+	struct sw_sync_create_fence_data data = {0};
+	data.value = seqno;
+
+	if (igt_ioctl(fd, LOCAL_SW_SYNC_IOC_CREATE_FENCE, &data))
+		return -errno;
+
+	return data.fence;
+}
+
+int sw_sync_fence_create(int fd, uint32_t seqno)
+{
+	int fence = __sw_sync_fence_create(fd, seqno);
+
+	igt_assert_f(sw_sync_fd_is_valid(fence), "Created invalid fence\n");
+
+	return fence;
+}
+
+void sw_sync_timeline_inc(int fd, uint32_t count)
+{
+	uint32_t arg = count;
+
+	do_ioctl(fd, LOCAL_SW_SYNC_IOC_INC, &arg);
+}
+
+int sync_merge(int fd1, int fd2)
+{
+	struct sync_merge_data data = {};
+	int err;
+
+	data.fd2 = fd2;
+
+	err = ioctl(fd1, SYNC_IOC_MERGE, &data);
+	if (err < 0)
+		return -errno;
+
+	return data.fence;
+}
+
+int sync_wait(int fd, int timeout)
+{
+	struct pollfd fds = {0};
+	int ret;
+
+	fds.fd = fd;
+	fds.events = POLLIN;
+
+	do {
+		 ret = poll(&fds, 1, timeout);
+		 if (ret > 0) {
+			  if (fds.revents & (POLLERR | POLLNVAL)) {
+				   errno = EINVAL;
+				   return -1;
+			  }
+			  return 0;
+		 } else if (ret == 0) {
+			  errno = ETIME;
+			  return -1;
+		 }
+	} while (ret == -1 && (errno == EINTR || errno == EAGAIN));
+
+	return ret;
+}
+
+int sync_fence_count(int fd)
+{
+	struct sync_file_info info = {0};
+
+	if (ioctl(fd, SYNC_IOC_FILE_INFO, &info))
+		return -errno;
+
+	return info.num_fences;
+}
+
+static int __sync_fence_count_status(int fd, int status)
+{
+	struct sync_file_info info = {0};
+	struct sync_fence_info *fence_info;
+	int count;
+	int i;
+
+	if (ioctl(fd, SYNC_IOC_FILE_INFO, &info))
+		return -errno;
+
+	fence_info = calloc(info.num_fences, sizeof(*fence_info));
+	if (!fence_info)
+		return -ENOMEM;
+
+	info.sync_fence_info = (uintptr_t)fence_info;
+	if (ioctl(fd, SYNC_IOC_FILE_INFO, &info)) {
+		count = -errno;
+	} else {
+		count = 0;
+		for (i = 0 ; i < info.num_fences ; i++)
+			if (fence_info[i].status == status)
+				count++;
+	}
+
+	free(fence_info);
+
+	return count;
+}
+
+int sync_fence_count_status(int fd, int status)
+{
+	int count = __sync_fence_count_status(fd, status);
+	igt_assert_f(count >= 0, "No fences with supplied status found\n");
+
+	return count;
+}
diff --git a/lib/sw_sync.h b/lib/sw_sync.h
new file mode 100644
index 00000000..cea5a603
--- /dev/null
+++ b/lib/sw_sync.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright © 2016 Collabora, Ltd.
+ *
+ * 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:
+ *    Robert Foss <robert.foss@collabora.com>
+ */
+
+#ifndef SW_SYNC_H
+#define SW_SYNC_H
+
+#define SW_SYNC_FENCE_STATUS_ERROR		(-1)
+#define SW_SYNC_FENCE_STATUS_ACTIVE		(0)
+#define SW_SYNC_FENCE_STATUS_SIGNALED	(1)
+
+int sw_sync_timeline_create(void);
+int __sw_sync_fence_create(int fd, uint32_t seqno);
+int sw_sync_fence_create(int fd, uint32_t seqno);
+void sw_sync_timeline_inc(int fd, uint32_t count);
+int sync_merge(int fd1, int fd2);
+int sync_wait(int fence, int timeout);
+int sync_fence_count(int fd);
+int sync_fence_count_status(int fd, int status);
+
+#endif
+
-- 
2.11.0

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