Commit 72fe4978 authored by Xianglai Li's avatar Xianglai Li
Browse files

LoongArch: add iommu support 

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/IB8FYW



------------------------------------------

Added iommu support for loongarch

Signed-off-by: default avatarXianglai Li <lixianglai@loongson.cn>
parent 083374f2

arch/loongarch/configs/loongson3_defconfig

+4 −0
Original line number Diff line number Diff line
@@ -2200,3 +2200,7 @@ CONFIG_FUNCTION_TRACER=y 
# CONFIG_STRICT_DEVMEM is not set

CONFIG_UNWINDER_ORC=y

# CONFIG_RUNTIME_TESTING_MENU is not set

CONFIG_LOONGARCH_IOMMU=m

CONFIG_IOMMU_DEFAULT_PASSTHROUGH=y

CONFIG_CMDLINE_EXTEND=y

CONFIG_CMDLINE="vfio_iommu_type1.allow_unsafe_interrupts=1 nokaslr"

arch/loongarch/include/asm/device.h

0 → 100644
+36 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Arch specific extensions to struct device

 *

 * This file is released under the GPLv2

 * Copyright (C) 2020 Loongson Technology Corporation Limited

 */

#ifndef _ASM_LOONGARCH_DEVICE_H

#define _ASM_LOONGARCH_DEVICE_H



struct dev_archdata {

	/* hook for IOMMU specific extension */

	void *iommu;

	struct bus_dma_region *dma_range_map;

	/*

	 * On some old 7A chipset, dma address is different from physical

	 * address, the main difference is that node id. For dma address

	 * node id starts from bit 36, physical node id starts from

	 * bit 44. The remaining address below node id is the same.

	 */

	unsigned long   dma_node_mask;

	unsigned int	dma_node_off;

};



struct pdev_archdata {

};



struct dma_domain {

	struct list_head node;

	const struct dma_map_ops *dma_ops;

	int domain_nr;

};

void add_dma_domain(struct dma_domain *domain);

void del_dma_domain(struct dma_domain *domain);



#endif /* _ASM_LOONGARCH_DEVICE_H*/

arch/loongarch/kvm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ config KVM 
	select SCHED_INFO

	select MMU_NOTIFIER

	select PREEMPT_NOTIFIERS

	select KVM_VFIO

	help

	  Support hosting virtualized guest machines using

	  hardware virtualization extensions. You will need

drivers/iommu/Kconfig

+14 −1
Original line number Diff line number Diff line
@@ -150,7 +150,7 @@ config OF_IOMMU 


# IOMMU-agnostic DMA-mapping layer

config IOMMU_DMA

	def_bool ARM64 || IA64 || X86 || S390

	def_bool ARM64 || IA64 || X86 || S390 || LOONGARCH

	select DMA_OPS

	select IOMMU_API

	select IOMMU_IOVA
@@ -527,4 +527,17 @@ config SMMU_BYPASS_DEV 
	  E.g:SMMU allow iMR3408/3416 Raid bypass at DMA default domain

	  to support other devices Virtualization through.



# LOONGARCH IOMMU support

config LOONGARCH_IOMMU

	tristate "LOONGARCH IOMMU support"

	select IOMMU_API

	select IOMMU_DEFAULT_PASSTHROUGH

	depends on LOONGARCH

	help

	  With this option you can enable support for LOONGARCH IOMMU hardware in

	  your system. An IOMMU is a hardware component which provides

	  remapping of DMA memory accesses from devices. With an LOONGARCH IOMMU you

	  can isolate the DMA memory of different devices and protect the

	  system from misbehaving device drivers or hardware.



endif # IOMMU_SUPPORT

drivers/iommu/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -30,3 +30,5 @@ obj-$(CONFIG_IOMMU_SVA) += iommu-sva.o 
obj-$(CONFIG_IOMMU_IOPF) += io-pgfault.o

obj-$(CONFIG_SPRD_IOMMU) += sprd-iommu.o

obj-$(CONFIG_APPLE_DART) += apple-dart.o

obj-$(CONFIG_LOONGARCH_IOMMU) += loongarch_iommu.o