gpu: nvgpu: add user API to get a syncpoint

Add new user API NVGPU_IOCTL_CHANNEL_GET_USER_SYNCPOINT which will expose
per-channel allocated syncpoint to user space
API will also return current value of the syncpoint
On supported platforms, this API will also return a RW semaphore address
(corresponding to syncpoint shim) to user space

Add new characteristics flag NVGPU_GPU_FLAGS_SUPPORT_USER_SYNCPOINT to indicate
support for this new API
Add new flag NVGPU_SUPPORT_USER_SYNCPOINT for use of core driver

Set this flag for GV11B and GP10B for now

Add a new API (*syncpt_address) in struct gk20a_channel_sync to get GPU_VA
address of a syncpoint

Add new API nvgpu_nvhost_syncpt_read_maxval() which will read and return MAX
value of syncpoint

Bug 200326065
Jira NVGPU-179

Change-Id: I9da6f17b85996f4fc6731c0bf94fca6f3181c3e0
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1658009
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c b/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
index 4a6b8162..e965a329 100644
--- a/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/channel_sync_gk20a.c
@@ -294,6 +294,13 @@ static int gk20a_channel_syncpt_id(struct gk20a_channel_sync *s)
         return sp->id;
 }
 
+static u64 gk20a_channel_syncpt_address(struct gk20a_channel_sync *s)
+{
+        struct gk20a_channel_syncpt *sp =
+                container_of(s, struct gk20a_channel_syncpt, ops);
+        return sp->syncpt_buf.gpu_va;
+}
+
 static void gk20a_channel_syncpt_destroy(struct gk20a_channel_sync *s)
 {
         struct gk20a_channel_syncpt *sp =
@@ -345,6 +352,7 @@ gk20a_channel_syncpt_create(struct channel_gk20a *c)
         sp->ops.set_min_eq_max          = gk20a_channel_syncpt_set_min_eq_max;
         sp->ops.signal_timeline         = gk20a_channel_syncpt_signal_timeline;
         sp->ops.syncpt_id               = gk20a_channel_syncpt_id;
+        sp->ops.syncpt_address          = gk20a_channel_syncpt_address;
         sp->ops.destroy                 = gk20a_channel_syncpt_destroy;
 
         return &sp->ops;
@@ -865,6 +873,11 @@ static int gk20a_channel_semaphore_syncpt_id(struct gk20a_channel_sync *s)
         return -EINVAL;
 }
 
+static u64 gk20a_channel_semaphore_syncpt_address(struct gk20a_channel_sync *s)
+{
+        return 0;
+}
+
 static void gk20a_channel_semaphore_destroy(struct gk20a_channel_sync *s)
 {
         struct gk20a_channel_semaphore *sema =
@@ -916,6 +929,7 @@ gk20a_channel_semaphore_create(struct channel_gk20a *c)
         sema->ops.set_min_eq_max = gk20a_channel_semaphore_set_min_eq_max;
         sema->ops.signal_timeline = gk20a_channel_semaphore_signal_timeline;
         sema->ops.syncpt_id     = gk20a_channel_semaphore_syncpt_id;
+        sema->ops.syncpt_address = gk20a_channel_semaphore_syncpt_address;
         sema->ops.destroy       = gk20a_channel_semaphore_destroy;
 
         return &sema->ops;