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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/+/2668255
Reviewed-by: Brad Griffis <bgriffis@nvidia.com>
Reviewed-by: Amulya Yarlagadda <ayarlagadda@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Brad Griffis <bgriffis@nvidia.com>
This commit is contained in:
Debarshi Dutta
2022-01-31 08:13:19 +05:30
committed by Amulya Yarlagadda
parent 7bf2833f34
commit 25bddffbfa
4 changed files with 27 additions and 9 deletions
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11
drivers/gpu/nvgpu/os/linux/driver_common.c
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@@ -1,5 +1,5 @@
/*
* Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved.
* Copyright (c) 2016-2022, 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,
@@ -18,6 +18,7 @@
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/of_platform.h>
#include <uapi/linux/nvgpu.h>
#include <nvgpu/defaults.h>
@@ -241,6 +242,8 @@ int nvgpu_probe(struct gk20a *g,
struct device *dev = dev_from_gk20a(g);
struct gk20a_platform *platform = dev_get_drvdata(dev);
int err = 0;
struct device_node *np = dev->of_node;
bool disable_l3_alloc = false;
nvgpu_init_vars(g);
nvgpu_init_gr_vars(g);
@@ -265,6 +268,12 @@ int nvgpu_probe(struct gk20a *g,
return err;
}
disable_l3_alloc = of_property_read_bool(np, "disable_l3_alloc");
if (disable_l3_alloc) {
nvgpu_log_info(g, "L3 alloc is disabled\n");
__nvgpu_set_enabled(g, NVGPU_DISABLE_L3_SUPPORT, true);
}
nvgpu_init_mm_vars(g);
/* platform probe can defer do user init only if probe succeeds */