drm-uapi: Add sync_file.h

Based on <linux/sync_file.h> with BSD portability conditional.
At least FreeBSD supports SYNC_IOC_* via LinuxKPI in DRM.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5463>

diff --git a/include/drm-uapi/sync_file.h b/include/drm-uapi/sync_file.h
new file mode 100644 (file)
index 0000000..11d86db
--- /dev/null
+++ b/include/drm-uapi/sync_file.h
@@ -0,0 +1,116 @@
+/* SPDX-License-Identifier: GPL-1.0+ WITH Linux-syscall-note */
+/*
+ * Copyright (C) 2012 Google, Inc.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _UAPI_LINUX_SYNC_H
+#define _UAPI_LINUX_SYNC_H
+
+#if defined(__linux__)
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#else /* One of the BSDs */
+
+#include <sys/types.h>
+#include <sys/ioccom.h>
+
+typedef int8_t   __s8;
+typedef uint8_t  __u8;
+typedef int16_t  __s16;
+typedef uint16_t __u16;
+typedef int32_t  __s32;
+typedef uint32_t __u32;
+typedef int64_t  __s64;
+typedef uint64_t __u64;
+
+#endif
+
+/**
+ * struct sync_merge_data - data passed to merge ioctl
+ * @name:      name of new fence
+ * @fd2:       file descriptor of second fence
+ * @fence:     returns the fd of the new fence to userspace
+ * @flags:     merge_data flags
+ * @pad:       padding for 64-bit alignment, should always be zero
+ */
+struct sync_merge_data {
+       char    name[32];
+       __s32   fd2;
+       __s32   fence;
+       __u32   flags;
+       __u32   pad;
+};
+
+/**
+ * struct sync_fence_info - detailed fence information
+ * @obj_name:          name of parent sync_timeline
+* @driver_name:        name of driver implementing the parent
+* @status:             status of the fence 0:active 1:signaled <0:error
+ * @flags:             fence_info flags
+ * @timestamp_ns:      timestamp of status change in nanoseconds
+ */
+struct sync_fence_info {
+       char    obj_name[32];
+       char    driver_name[32];
+       __s32   status;
+       __u32   flags;
+       __u64   timestamp_ns;
+};
+
+/**
+ * struct sync_file_info - data returned from fence info ioctl
+ * @name:      name of fence
+ * @status:    status of fence. 1: signaled 0:active <0:error
+ * @flags:     sync_file_info flags
+ * @num_fences number of fences in the sync_file
+ * @pad:       padding for 64-bit alignment, should always be zero
+ * @sync_fence_info: pointer to array of structs sync_fence_info with all
+ *              fences in the sync_file
+ */
+struct sync_file_info {
+       char    name[32];
+       __s32   status;
+       __u32   flags;
+       __u32   num_fences;
+       __u32   pad;
+
+       __u64   sync_fence_info;
+};
+
+#define SYNC_IOC_MAGIC         '>'
+
+/**
+ * Opcodes  0, 1 and 2 were burned during a API change to avoid users of the
+ * old API to get weird errors when trying to handling sync_files. The API
+ * change happened during the de-stage of the Sync Framework when there was
+ * no upstream users available.
+ */
+
+/**
+ * DOC: SYNC_IOC_MERGE - merge two fences
+ *
+ * Takes a struct sync_merge_data.  Creates a new fence containing copies of
+ * the sync_pts in both the calling fd and sync_merge_data.fd2.  Returns the
+ * new fence's fd in sync_merge_data.fence
+ */
+#define SYNC_IOC_MERGE         _IOWR(SYNC_IOC_MAGIC, 3, struct sync_merge_data)
+
+/**
+ * DOC: SYNC_IOC_FILE_INFO - get detailed information on a sync_file
+ *
+ * Takes a struct sync_file_info. If num_fences is 0, the field is updated
+ * with the actual number of fences. If num_fences is > 0, the system will
+ * use the pointer provided on sync_fence_info to return up to num_fences of
+ * struct sync_fence_info, with detailed fence information.
+ */
+#define SYNC_IOC_FILE_INFO     _IOWR(SYNC_IOC_MAGIC, 4, struct sync_file_info)
+
+#endif /* _UAPI_LINUX_SYNC_H */