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[DOWNSTREAM]iommu/arm-smmu-v3: use reserved memory for allocations

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CMA allocations are reusable. When not allocated, it can be used
for temporary allocations. When there is allocation request,
temporary allocations will be reclaimed and that takes time.

SMMU uses CMA allocations and causing boot time increase. To avoid
this, add reserved memory pool and use for SMMU allocations instead
of CMA.

With reserved memory 1MB allocation time is reduced from 17999343ns
to 166037ns.

Bug 5115195

Change-Id: I34febac4235da68027908969b9348cbfd2feffc4
Signed-off-by: Pritesh Raithatha <praithatha@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/3rdparty/canonical/linux-noble/+/3446227
Reviewed-by: svcacv <svcacv@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>
Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Tested-by: Bharat Nihalani <bnihalani@nvidia.com>
This commit is contained in:
Pritesh Raithatha
2025-04-17 03:04:36 -07:00
committed by Ashish Mhetre
parent fee12cf9e3
commit 56a7b340cd
1 changed files with 6 additions and 1 deletions
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7
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
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@@ -2,7 +2,8 @@
/*
* IOMMU API for ARM architected SMMUv3 implementations.
*
* Copyright (C) 2015 ARM Limited
* SPDX-FileCopyrightText: Copyright (C) 2015 ARM Limited
* SPDX-FileCopyrightText: Copyright (c) 2023-2025, NVIDIA CORPORATION. All rights reserved.
*
* Author: Will Deacon <will.deacon@arm.com>
*
@@ -23,6 +24,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/of_reserved_mem.h>
#include <linux/pci.h>
#include <linux/pci-ats.h>
#include <linux/platform_device.h>
@@ -3814,6 +3816,9 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev,
u32 cells;
int ret = -EINVAL;
if (!of_reserved_mem_device_init(dev))
dev_info(dev, "using device-specific reserved memory\n");
if (of_property_read_u32(dev->of_node, "#iommu-cells", &cells))
dev_err(dev, "missing #iommu-cells property\n");
else if (cells != 1)