gpu: nvgpu: clean up memory leaks in gr init

This is to resolve memory leak after modifying
tpc_fs_mask sysfs which sets gr.sw_ready to false and
forces gr to re-initialize.

echo 1 > /sys/devices/gpu.0/force_idle
echo 5 > /sys/devices/gpu.0/tpc_fs_mask
echo 0 > /sys/devices/gpu.0/force_idle

Bug 200393029

Change-Id: I76299f53fc87823071c672ec682c3eb51f72f513
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1666018
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/common/ltc.c b/drivers/gpu/nvgpu/common/ltc.c
index 006e2ed2..024c2e49 100644
--- a/drivers/gpu/nvgpu/common/ltc.c
+++ b/drivers/gpu/nvgpu/common/ltc.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017-2018, NVIDIA CORPORATION.  All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -22,6 +22,7 @@
 
 #include <nvgpu/ltc.h>
 #include <nvgpu/dma.h>
+#include <nvgpu/nvgpu_mem.h>
 
 #include "gk20a/gk20a.h"
 #include "gk20a/gr_gk20a.h"
@@ -54,6 +55,9 @@ int nvgpu_ltc_alloc_cbc(struct gk20a *g, size_t compbit_backing_size)
         struct gr_gk20a *gr = &g->gr;
         unsigned long flags = 0;
 
+        if (nvgpu_mem_is_valid(&gr->compbit_store.mem))
+                return 0;
+
         if (!nvgpu_iommuable(g))
                 flags = NVGPU_DMA_FORCE_CONTIGUOUS;