gpu: nvgpu: fix coverity, Recursion in included headers

- Fix recursion in included header,
 gk20a.h -> perf.h -> pstate.h -> gk20a.h
- Removed "gk20a.h" from pstate.h but need to forward declare
 "struct gk20a" as referenced in header file.

bug 200291879

Change-Id: I124c1c5cf4adcbd485de0800a73e0dc7f11fa92e
Signed-off-by: Mahantesh Kumbar <mkumbar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1566037
GVS: Gerrit_Virtual_Submit
Reviewed-by: svccoveritychecker <svccoveritychecker@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/pstate/pstate.h b/drivers/gpu/nvgpu/pstate/pstate.h
index 4a3899a9..17dbd476 100644
--- a/drivers/gpu/nvgpu/pstate/pstate.h
+++ b/drivers/gpu/nvgpu/pstate/pstate.h
@@ -24,7 +24,6 @@
 #ifndef __PSTATE_H__
 #define __PSTATE_H__
 
-#include "gk20a/gk20a.h"
 #include "clk/clk.h"
 
 #define CTRL_PERF_PSTATE_TYPE_3X        0x3
@@ -35,6 +34,8 @@
 
 #define CLK_SET_INFO_MAX_SIZE           (32)
 
+struct gk20a;
+
 struct clk_set_info {
         enum nv_pmu_clk_clkwhich clkwhich;
         u32 nominal_mhz;