gpu: nvgpu: Fixing SWDVR issues in qnx-mem and qnx-sync

This is fixing some swdvr issues found during swdvr process.

JIRA NVGPU-6613
JIRA NVGPU-6614

Signed-off-by: dt <dt@nvidia.com>
Change-Id: Iadbdefd1ed57f9a3fb46690c9ad4b6e38a876b31
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2521352
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/gpu/nvgpu/include/nvgpu/dma.h

@@ -155,7 +155,9 @@ int nvgpu_dma_alloc_sys(struct gk20a *g, size_t size, struct nvgpu_mem *mem);
  *
  * Allocate memory suitable for doing DMA. Store the allocation info in #mem.
  * Returns 0 on success and a suitable error code when there's an error. This
- * allocates memory specifically in SYSMEM.
+ * allocates memory specifically in SYSMEM. If the #mem already holds the physical
+ * memory information, then the API just create the import id associated with
+ * the #mem.
  *
  * @return	0 For success, < 0 for failure.
  * @retval	-ENOMEM For failure in handle creation or mapping operation.

drivers/gpu/nvgpu/include/nvgpu/nvhost.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017-2021, 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"),
@@ -44,8 +44,6 @@ struct nvgpu_nvhost_dev;
  * @param g [in]	The GPU super structure.
  *
  * - Allocate memory for g.nvhost_dev.
- * - Get the type of the hardware(t186/t194) by calling
- *   #NvTegraSysGetChipId().
  * - Initialize the number of synpoints according to the
  *   associated hardware.
  * - Allocate and initialize different fields associated with