gpu: nvgpu: alarm/event interface cleanup

use CPU timestamp in nanoseconds
define last event/alarm number

Jira DNVGPU-186

Change-Id: I769c8a7a41ac1fb49234f0d5144a78fa657ec230
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1260799
(cherry picked from commit 379171b43cb20d7a31b3966cad3696525e8cf7d9)
Reviewed-on: http://git-master/r/1267159
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 4c4b0f8c..649cdf02 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -695,7 +695,7 @@ struct nvgpu_gpu_get_event_fd_args {
         /* in: Flags (not currently used). */
         __u32 flags;
 
-        /* out: File descriptor for events, i.e. clock update.
+        /* out: File descriptor for events, e.g. clock update.
          * On successful polling of this event_fd, application is
          * expected to read status (nvgpu_gpu_event_info),
          * which provides detailed event information
@@ -873,14 +873,16 @@ struct nvgpu_gpu_get_temperature_args {
 /* Alarm on power condition */
 #define NVGPU_GPU_EVENT_ALARM_POWER_ABOVE_THRESHOLD             6
 
-/* Non recoverable alarm (POLLUP) */
+/* Non recoverable alarm (POLLHUP) */
 /* Alarm on GPU shutdown/fall from bus */
 #define NVGPU_GPU_EVENT_ALARM_GPU_LOST                          7
 
+#define NVGPU_GPU_EVENT_LAST    NVGPU_GPU_EVENT_ALARM_GPU_LOST
+
 struct nvgpu_gpu_event_info {
         __u32 event_id;         /* NVGPU_GPU_EVENT_* */
         __u32 reserved;
-        __u64 timestamp;        /* GPU timestamp */
+        __u64 timestamp;        /* CPU timestamp (in nanoseconds) */
 };
 
 struct nvgpu_gpu_set_event_filter_args {