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, 11 insertions, 1 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index f8211374..cf75595a 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -154,6 +154,8 @@ struct nvgpu_gpu_zbc_query_table_args {
 #define NVGPU_GPU_FLAGS_SUPPORT_SYNCPOINT_ADDRESS       (1ULL << 26)
 /* VPR is supported */
 #define NVGPU_GPU_FLAGS_SUPPORT_VPR                     (1ULL << 27)
+/* Allocating per-channel syncpoint in user space is supported */
+#define NVGPU_GPU_FLAGS_SUPPORT_USER_SYNCPOINT          (1ULL << 28)
 /* SM LRF ECC is enabled */
 #define NVGPU_GPU_FLAGS_ECC_ENABLED_SM_LRF      (1ULL << 60)
 /* SM SHM ECC is enabled */
@@ -1648,6 +1650,12 @@ struct nvgpu_boosted_ctx_args {
         __u32 padding;
 };
 
+struct nvgpu_get_user_syncpoint_args {
+        __u64 gpu_va;           /* out */
+        __u32 syncpoint_id;     /* out */
+        __u32 syncpoint_max;    /* out */
+};
+
 #define NVGPU_IOCTL_CHANNEL_SET_NVMAP_FD        \
         _IOW(NVGPU_IOCTL_MAGIC, 5, struct nvgpu_set_nvmap_fd_args)
 #define NVGPU_IOCTL_CHANNEL_SET_TIMEOUT \
@@ -1698,9 +1706,11 @@ struct nvgpu_boosted_ctx_args {
         _IOW(NVGPU_IOCTL_MAGIC, 124, struct nvgpu_boosted_ctx_args)
 #define NVGPU_IOCTL_CHANNEL_GET_TIMESLICE \
         _IOW(NVGPU_IOCTL_MAGIC, 125, struct nvgpu_timeslice_args)
+#define NVGPU_IOCTL_CHANNEL_GET_USER_SYNCPOINT \
+        _IOR(NVGPU_IOCTL_MAGIC, 126, struct nvgpu_get_user_syncpoint_args)
 
 #define NVGPU_IOCTL_CHANNEL_LAST        \
-        _IOC_NR(NVGPU_IOCTL_CHANNEL_GET_TIMESLICE)
+        _IOC_NR(NVGPU_IOCTL_CHANNEL_GET_USER_SYNCPOINT)
 #define NVGPU_IOCTL_CHANNEL_MAX_ARG_SIZE sizeof(struct nvgpu_alloc_gpfifo_ex_args)
 
 /*