gpu: nvgpu: IOCTL to suspend/resume context

Add below IOCTL to suspend/resume a context
NVGPU_DBG_GPU_IOCTL_SUSPEND_RESUME_CONTEXTS:

Suspend sequence :
- disable ctxsw
- loop through list of channels
- if channel is ctx resident, suspend all SMs
- otherwise, disable channel/TSG
- enable ctxsw

Resume sequence :
- disable ctxsw
- loop through list of channels
- if channel is ctx resident, resume all SMs
- otherwise, enable channel/TSG
- enable ctxsw

Bug 200156699

Change-Id: Iacf1bf7877b67ddf87cc6891c37c758a4644b014
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: http://git-master/r/1120332
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index b03e779b..5c397ad8 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -248,6 +248,9 @@ struct gpu_ops {
                                                                 sm_error_state);
                 int (*clear_sm_error_state)(struct gk20a *g,
                                 struct channel_gk20a *ch, u32 sm_id);
+                int (*suspend_contexts)(struct gk20a *g,
+                                struct dbg_session_gk20a *dbg_s,
+                                int *ctx_resident_ch_fd);
         } gr;
         const char *name;
         struct {