video: tegra: host: nvdla, pva: add task information to fences

For NSys, we're interested in having detailed information on what task
waits on a particular prefence or requests a particular postfence.
This is implemented by adding two extra fields, 'task_syncpt_id' and
'task_syncpt_thresh' to 'struct nvhost_task_fence', to record the task
this particular fence is associated with.

To avoid race conditon in pva_submit (similar to what was fixed in
0c2065fd669926536f79fd9e8ec33f33cbdcae2e), PVA task memory management
is changed to use simple kref-based scheme, much like it's done in DLA.

Finally, this patch renames syncpoint fields of 'task_fence' to 'syncpt_id'
and 'syncpt_thresh' to match the same field names in other events, which
is intended to simplify Python scripting.

JIRA DTSP-1662
JIRA DTSP-682
Bug 2568514

Signed-off-by: Dmitry Antipov <dantipov@nvidia.com>
Change-Id: I4c55efcae15eb80a0d950882d6ff6e5ac706ab20
Reviewed-on: https://git-master.nvidia.com/r/1978175
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: Shridhar Rasal <srasal@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2099982
Reviewed-by: Mitch Harwell <mharwell@nvidia.com>
Tested-by: Mitch Harwell <mharwell@nvidia.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/include/uapi/linux/nvhost_events.h b/include/uapi/linux/nvhost_events.h
index 7399906eb..1c1fd7229 100644
--- a/include/uapi/linux/nvhost_events.h
+++ b/include/uapi/linux/nvhost_events.h
@@ -1,7 +1,7 @@
 /*
  * Eventlib interface for PVA
  *
- * Copyright (c) 2016-2018, NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2016-2019, NVIDIA Corporation.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -98,12 +98,16 @@ struct nvhost_task_fence {
         /* Kind (prefence or postfence) */
         u32 kind;
 
-        /* Type (see nvdev_fence.h) */
-        u32 type;
+        /* Fence-specific type (see nvdev_fence.h) */
+        u32 fence_type;
 
         /* Valid for NVDEV_FENCE_TYPE_SYNCPT only */
-        u32 syncpoint_index;
-        u32 syncpoint_value;
+        u32 syncpt_id;
+        u32 syncpt_thresh;
+
+        /* The task this fence is associated with */
+        u32 task_syncpt_id;
+        u32 task_syncpt_thresh;
 
         /* Valid for NVDEV_FENCE_TYPE_SYNC_FD only */
         u32 sync_fd;