video: tegra: host: add User API to get poll'able FD

Add IOCTL API NVHOST_IOCTL_CTRL_POLL_FD_CREATE to get a poll'able
file descriptor

This API will allocate a file descriptor and set struct nvhost_event_poll_fd_rec
as private data for file

Also define poll and release operations for the file descriptor
poll() API will return success if event is posted on private data
It will also clear the event before returning

Bug 200326065
Jira HOSTX-332

Change-Id: I5bca2f8e26cbac848d3fd714aa4d7198b5895fe5
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1665694
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 9 insertions, 2 deletions

diff --git a/include/linux/nvhost_ioctl.h b/include/linux/nvhost_ioctl.h
index 0bae555b8..94d0f4a99 100644
--- a/include/linux/nvhost_ioctl.h
+++ b/include/linux/nvhost_ioctl.h
@@ -3,7 +3,7 @@
  *
  * Tegra graphics host driver
  *
- * Copyright (c) 2009-2017, NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2009-2018, NVIDIA Corporation.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -439,6 +439,11 @@ struct nvhost_ctrl_check_module_support_args {
         __u32 value;
 };
 
+struct nvhost_ctrl_poll_fd_create_args {
+        __s32 fd;
+        __u32 padding;
+};
+
 #define NVHOST_IOCTL_CTRL_SYNCPT_READ           \
         _IOWR(NVHOST_IOCTL_MAGIC, 1, struct nvhost_ctrl_syncpt_read_args)
 #define NVHOST_IOCTL_CTRL_SYNCPT_INCR           \
@@ -475,9 +480,11 @@ struct nvhost_ctrl_check_module_support_args {
         _IOWR(NVHOST_IOCTL_MAGIC, 14, struct nvhost_ctrl_get_characteristics)
 #define NVHOST_IOCTL_CTRL_CHECK_MODULE_SUPPORT  \
         _IOWR(NVHOST_IOCTL_MAGIC, 15, struct nvhost_ctrl_check_module_support_args)
+#define NVHOST_IOCTL_CTRL_POLL_FD_CREATE        \
+        _IOR(NVHOST_IOCTL_MAGIC, 16, struct nvhost_ctrl_poll_fd_create_args)
 
 #define NVHOST_IOCTL_CTRL_LAST                  \
-        _IOC_NR(NVHOST_IOCTL_CTRL_CHECK_MODULE_SUPPORT)
+        _IOC_NR(NVHOST_IOCTL_CTRL_POLL_FD_CREATE)
 #define NVHOST_IOCTL_CTRL_MAX_ARG_SIZE  \
         sizeof(struct nvhost_ctrl_syncpt_waitmex_args)