gpu: nvgpu: HAL to get current pstate

- Added HAL support to get current
  pstate from clk_arb

Note - This function is inherently unsafe to call while
arbiter is running arbiter must be blocked
before calling this function

JIRA DNVGPU-165

Change-Id: I4e9f5eba7739280bddd9ee661fd314288c129516
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: http://git-master/r/1286378
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 692f054f..a78ff506 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -656,6 +656,10 @@ struct gpu_ops {
                                 u16 *min_mhz, u16 *max_mhz);
                 int (*get_arbiter_clk_default)(struct gk20a *g, u32 api_domain,
                                 u16 *default_mhz);
+                /* This function is inherently unsafe to call while
+                 *  arbiter is running arbiter must be blocked
+                 *  before calling this function */
+                int (*get_current_pstate)(struct gk20a *g);
         } clk_arb;
         struct {
                 int (*handle_pmu_perf_event)(struct gk20a *g, void *pmu_msg);