gpu: nvgpu: add device alarms

Add event definitions for:
- Clock alarm (target frequency not met)
- Thermal alarm (temperature above threshold)
- Power alarm (power above threshold)
- GPU shut down

Jira DNVGPU-186

Change-Id: I52edd44352ed0cba83033949272f41cc9e1c630f
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: http://git-master/r/1249342
(cherry picked from commit 67a6681aade241ff24982771778f7e2193d1cd7f)
Reviewed-on: http://git-master/r/1267157
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 73 insertions, 4 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 0aeea4f0..746ae94a 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -126,6 +126,10 @@ struct nvgpu_gpu_zbc_query_table_args {
 #define NVGPU_GPU_FLAGS_SUPPORT_GET_POWER               (1ULL << 12)
 /* NVGPU_GPU_IOCTL_GET_TEMPERATURE is available */
 #define NVGPU_GPU_FLAGS_SUPPORT_GET_TEMPERATURE         (1ULL << 13)
+/* NVGPU_GPU_IOCTL_SET_THERM_ALERT_LIMIT is available */
+#define NVGPU_GPU_FLAGS_SUPPORT_SET_THERM_ALERT_LIMIT   (1ULL << 14)
+/* NVGPU_GPU_IOCTL_GET_EVENT_FD is available */
+#define NVGPU_GPU_FLAGS_SUPPORT_DEVICE_EVENTS           (1ULL << 15)
 
 struct nvgpu_gpu_characteristics {
         __u32 arch;
@@ -223,6 +227,8 @@ struct nvgpu_gpu_characteristics {
            - If the last field is reserved/padding, it is not
              generally safe to repurpose the field in future revisions.
         */
+        __s16 event_ioctl_nr_last;
+        __u16 pad[3];
 };
 
 struct nvgpu_gpu_get_characteristics {
@@ -684,12 +690,18 @@ struct nvgpu_gpu_clk_set_info_args {
         __s32 completion_fd;
 };
 
-struct nvgpu_gpu_clk_get_event_fd_args {
+struct nvgpu_gpu_get_event_fd_args {
 
         /* in: Flags (not currently used). */
         __u32 flags;
 
-        /* out: File descriptor for events, i.e. any clock update. */
+        /* out: File descriptor for events, i.e. clock update.
+         * On successful polling of this event_fd, application is
+         * expected to read status (nvgpu_gpu_event_info),
+         * which provides detailed event information
+         * For a poll operation, alarms will be reported with POLLPRI,
+         * and GPU shutdown will be reported with POLLHUP.
+         */
         __s32 event_fd;
 };
 
@@ -815,8 +827,8 @@ struct nvgpu_gpu_get_temperature_args {
         _IOWR(NVGPU_GPU_IOCTL_MAGIC, 30, struct nvgpu_gpu_clk_get_info_args)
 #define NVGPU_GPU_IOCTL_CLK_SET_INFO \
         _IOWR(NVGPU_GPU_IOCTL_MAGIC, 31, struct nvgpu_gpu_clk_set_info_args)
-#define NVGPU_GPU_IOCTL_CLK_GET_EVENT_FD \
-        _IOWR(NVGPU_GPU_IOCTL_MAGIC, 32, struct nvgpu_gpu_clk_get_event_fd_args)
+#define NVGPU_GPU_IOCTL_GET_EVENT_FD \
+        _IOWR(NVGPU_GPU_IOCTL_MAGIC, 32, struct nvgpu_gpu_get_event_fd_args)
 #define NVGPU_GPU_IOCTL_GET_MEMORY_STATE \
         _IOWR(NVGPU_GPU_IOCTL_MAGIC, 33, \
                         struct nvgpu_gpu_get_memory_state_args)
@@ -836,6 +848,63 @@ struct nvgpu_gpu_get_temperature_args {
         sizeof(struct nvgpu_gpu_get_cpu_time_correlation_info_args)
 
 /*
+ * Event session
+ *
+ * NVGPU_GPU_IOCTL_GET_EVENT_FD opens an event session.
+ * Below ioctls can be used on these sessions fds.
+ */
+#define NVGPU_EVENT_IOCTL_MAGIC 'E'
+
+/* Normal events (POLLIN) */
+/* Event associated to a VF update */
+#define NVGPU_GPU_EVENT_VF_UPDATE                               0
+
+/* Recoverable alarms (POLLPRI) */
+/* Alarm when target frequency on any session is not possible */
+#define NVGPU_GPU_EVENT_ALARM_TARGET_VF_NOT_POSSIBLE            2
+/* Alarm when target frequency on current session is not possible */
+#define NVGPU_GPU_EVENT_ALARM_LOCAL_TARGET_VF_NOT_POSSIBLE      3
+/* Alarm when Clock Arbiter failed */
+#define NVGPU_GPU_EVENT_ALARM_CLOCK_ARBITER_FAILED              4
+/* Alarm when VF table update failed */
+#define NVGPU_GPU_EVENT_ALARM_VF_TABLE_UPDATE_FAILED            5
+/* Alarm on thermal condition */
+#define NVGPU_GPU_EVENT_ALARM_THERMAL_ABOVE_THRESHOLD           6
+/* Alarm on power condition */
+#define NVGPU_GPU_EVENT_ALARM_POWER_ABOVE_THRESHOLD             7
+
+/* Non recoverable alarm (POLLUP) */
+/* Alarm on GPU shutdown/fall from bus */
+#define NVGPU_GPU_EVENT_ALARM_GPU_LOST                          8
+
+struct nvgpu_gpu_event_info {
+        __u32 event_id;         /* NVGPU_GPU_EVENT_* */
+        __u32 reserved;
+        __u64 timestamp;        /* GPU timestamp */
+};
+
+struct nvgpu_gpu_set_event_filter_args {
+
+        /* in: Flags (not currently used). */
+        __u32 flags;
+
+        /* in: Size of event filter in 32-bit words */
+        __u32 size;
+
+        /* in: Address of buffer containing bit mask of events.
+         * Bit #n is set if event #n should be monitored.
+         */
+        __u64 buffer;
+};
+
+#define NVGPU_EVENT_IOCTL_SET_FILTER \
+        _IOW(NVGPU_EVENT_IOCTL_MAGIC, 1, struct nvgpu_gpu_set_event_filter_args)
+#define NVGPU_EVENT_IOCTL_LAST          \
+        _IOC_NR(NVGPU_EVENT_IOCTL_SET_FILTER)
+#define NVGPU_EVENT_IOCTL_MAX_ARG_SIZE  \
+        sizeof(struct nvgpu_gpu_set_event_filter_args)
+
+/*
  * /dev/nvhost-tsg-gpu device
  *
  * Opening a '/dev/nvhost-tsg-gpu' device node creates a way to