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gpu: nvgpu: add support for disabling l3 via DT

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On volta the GPU determines whether to do L3 allocation for a mapping by
checking bit 36 of the physical address. So if a mapping should allocate lines
in the L3 this bit must be set.

However, when the physical addresses for 64GB of RAM uses the 36th bit
resulting in a conflict. Thus, add support for disabling l3 support
for SKUs having 64GB of physical memory.

Bug 3486025

Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Change-Id: Ic540e754274cf1d9e6625493962699d21509e540
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2661548
(cherry picked from commit 46b43d2b24)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2667676
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Tested-by: Brad Griffis <bgriffis@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Debarshi Dutta
2022-01-31 08:13:19 +05:30
committed by Amulya Yarlagadda
parent 2c441a83d4
commit cb09a821d5
4 changed files with 27 additions and 9 deletions
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8
drivers/gpu/nvgpu/os/linux/vm.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2017-2020, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2017-2022, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@@ -50,8 +50,10 @@ static u32 nvgpu_vm_translate_linux_flags(struct gk20a *g, u32 flags)
core_flags |= NVGPU_VM_MAP_IO_COHERENT;
if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_UNMAPPED_PTE)
core_flags |= NVGPU_VM_MAP_UNMAPPED_PTE;
if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC)
core_flags |= NVGPU_VM_MAP_L3_ALLOC;
if (!nvgpu_is_enabled(g, NVGPU_DISABLE_L3_SUPPORT)) {
if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_L3_ALLOC)
core_flags |= NVGPU_VM_MAP_L3_ALLOC;
}
if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_DIRECT_KIND_CTRL)
core_flags |= NVGPU_VM_MAP_DIRECT_KIND_CTRL;
if (flags & NVGPU_AS_MAP_BUFFER_FLAGS_PLATFORM_ATOMIC)