gpu: nvgpu: expose deterministic submit support

Add these bits in the gpu characteristics flags:

NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_NO_JOBTRACKING - fast
submits with no in-kernel job tracking are supported.

NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_FULL - deterministic
submits also with job tracking and num_inflight_jobs set are supported.

Either of these may get disabled if the particular channel or submit
still requires features that block these.

Make gk20a_channel_sync_needs_sync_framework() take a gk20a pointer
instead of a channel pointer so that it can be called without a channel.
It does not need any per-channel data.

Bug 200291300

Change-Id: I5f82510b6d39b53bcf6f1006dd83bdd9053963a0
Signed-off-by: Konsta Holtta <kholtta@nvidia.com>
Reviewed-on: http://git-master/r/1456845
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index e25667cb..401722b1 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -137,6 +137,10 @@ struct nvgpu_gpu_zbc_query_table_args {
 #define NVGPU_GPU_FLAGS_SUPPORT_FECS_CTXSW_TRACE        (1ULL << 16)
 /* NVGPU_AS_IOCTL_MAP_BUFFER_COMPBITS is available */
 #define NVGPU_GPU_FLAGS_SUPPORT_MAP_COMPBITS            (1ULL << 17)
+/* Fast deterministic submits with no job tracking are supported */
+#define NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_NO_JOBTRACKING (1ULL << 18)
+/* Deterministic submits are supported even with job tracking */
+#define NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_FULL (1ULL << 19)
 
 struct nvgpu_gpu_characteristics {
         __u32 arch;
@@ -1348,8 +1352,22 @@ struct nvgpu_alloc_gpfifo_args {
 struct nvgpu_alloc_gpfifo_ex_args {
         __u32 num_entries;
         __u32 num_inflight_jobs;
-#define NVGPU_ALLOC_GPFIFO_EX_FLAGS_VPR_ENABLED         (1 << 0) /* set owner channel of this gpfifo as a vpr channel */
-#define NVGPU_ALLOC_GPFIFO_EX_FLAGS_DETERMINISTIC       (1 << 1) /* channel shall exhibit deterministic behavior in the submit path */
+/* Set owner channel of this gpfifo as a vpr channel. */
+#define NVGPU_ALLOC_GPFIFO_EX_FLAGS_VPR_ENABLED         (1 << 0)
+/*
+ * Channel shall exhibit deterministic behavior in the submit path.
+ *
+ * With this flag, any submits with in-kernel job tracking also require that
+ * num_inflight_jobs is nonzero, and additionally that
+ * NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_FULL is found in gpu
+ * characteristics.flags.
+ *
+ * Note that fast submits (with no in-kernel job tracking) are also
+ * deterministic and are supported if the characteristics flags contain
+ * NVGPU_GPU_FLAGS_SUPPORT_DETERMINISTIC_SUBMIT_NO_JOBTRACKING; this flag or
+ * num_inflight_jobs are not necessary in that case.
+ */
+#define NVGPU_ALLOC_GPFIFO_EX_FLAGS_DETERMINISTIC       (1 << 1)
         __u32 flags;
         __u32 reserved[5];
 };