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>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/include/nvgpu/enabled.h b/drivers/gpu/nvgpu/include/nvgpu/enabled.h
index e6f9525d..a3d9df24 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/enabled.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/enabled.h
@@ -157,11 +157,13 @@ struct gk20a;
 
 /* GPU_VA address of a syncpoint is supported */
 #define NVGPU_SUPPORT_SYNCPOINT_ADDRESS         65
+/* Allocating per-channel syncpoint in user space is supported */
+#define NVGPU_SUPPORT_USER_SYNCPOINT            66
 
 /*
  * Must be greater than the largest bit offset in the above list.
  */
-#define NVGPU_MAX_ENABLED_BITS                  66
+#define NVGPU_MAX_ENABLED_BITS                  67
 
 /**
  * nvgpu_is_enabled - Check if the passed flag is enabled.
diff --git a/drivers/gpu/nvgpu/include/nvgpu/nvhost.h b/drivers/gpu/nvgpu/include/nvgpu/nvhost.h
index 6e92637a..cb70f436 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/nvhost.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/nvhost.h
@@ -50,6 +50,8 @@ void nvgpu_nvhost_syncpt_set_min_eq_max_ext(struct nvgpu_nvhost_dev *nvhost_dev,
         u32 id);
 int nvgpu_nvhost_syncpt_read_ext_check(struct nvgpu_nvhost_dev *nvhost_dev,
         u32 id, u32 *val);
+u32 nvgpu_nvhost_syncpt_read_maxval(struct nvgpu_nvhost_dev *nvhost_dev,
+        u32 id);
 
 int nvgpu_nvhost_intr_register_notifier(struct nvgpu_nvhost_dev *nvhost_dev,
         u32 id, u32 thresh, void (*callback)(void *, int), void *private_data);