Commit e785dfac authored by Xianglai Li's avatar Xianglai Li Committed by Huacai Chen
Browse files

LoongArch: KVM: Add PCHPIC device support 



Add device model for PCHPIC interrupt controller, implemente basic
create & destroy interface, and register device model to kvm device
table.

Signed-off-by: default avatarTianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: default avatarXianglai Li <lixianglai@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent 1ad7efa5

arch/loongarch/include/asm/kvm_host.h

+2 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
#include <asm/kvm_mmu.h>

#include <asm/kvm_ipi.h>

#include <asm/kvm_eiointc.h>

#include <asm/kvm_pch_pic.h>

#include <asm/loongarch.h>



/* Loongarch KVM register ids */
@@ -125,6 +126,7 @@ struct kvm_arch { 
	struct kvm_context __percpu *vmcs;

	struct loongarch_ipi *ipi;

	struct loongarch_eiointc *eiointc;

	struct loongarch_pch_pic *pch_pic;

};



#define CSR_MAX_NUMS		0x800

arch/loongarch/include/asm/kvm_pch_pic.h

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+31 −0
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/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Copyright (C) 2024 Loongson Technology Corporation Limited

 */



#ifndef __ASM_KVM_PCH_PIC_H

#define __ASM_KVM_PCH_PIC_H



#include <kvm/iodev.h>



struct loongarch_pch_pic {

	spinlock_t lock;

	struct kvm *kvm;

	struct kvm_io_device device;

	uint64_t mask; /* 1:disable irq, 0:enable irq */

	uint64_t htmsi_en; /* 1:msi */

	uint64_t edge; /* 1:edge triggered, 0:level triggered */

	uint64_t auto_ctrl0; /* only use default value 00b */

	uint64_t auto_ctrl1; /* only use default value 00b */

	uint64_t last_intirr; /* edge detection */

	uint64_t irr; /* interrupt request register */

	uint64_t isr; /* interrupt service register */

	uint64_t polarity; /* 0: high level trigger, 1: low level trigger */

	uint8_t  route_entry[64]; /* default value 0, route to int0: eiointc */

	uint8_t  htmsi_vector[64]; /* irq route table for routing to eiointc */

	uint64_t pch_pic_base;

};



int kvm_loongarch_register_pch_pic_device(void);



#endif /* __ASM_KVM_PCH_PIC_H */

arch/loongarch/kvm/Makefile

+1 −0
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@@ -20,5 +20,6 @@ kvm-y += vcpu.o 
kvm-y += vm.o

kvm-y += intc/ipi.o

kvm-y += intc/eiointc.o

kvm-y += intc/pch_pic.o



CFLAGS_exit.o	+= $(call cc-option,-Wno-override-init,)

arch/loongarch/kvm/intc/pch_pic.c

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+88 −0
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// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2024 Loongson Technology Corporation Limited

 */



#include <asm/kvm_eiointc.h>

#include <asm/kvm_pch_pic.h>

#include <asm/kvm_vcpu.h>

#include <linux/count_zeros.h>



static int kvm_pch_pic_read(struct kvm_vcpu *vcpu,

			struct kvm_io_device *dev,

			gpa_t addr, int len, void *val)

{

	return 0;

}



static int kvm_pch_pic_write(struct kvm_vcpu *vcpu,

			struct kvm_io_device *dev,

			gpa_t addr, int len, const void *val)

{

	return 0;

}



static const struct kvm_io_device_ops kvm_pch_pic_ops = {

	.read	= kvm_pch_pic_read,

	.write	= kvm_pch_pic_write,

};



static int kvm_pch_pic_get_attr(struct kvm_device *dev,

				struct kvm_device_attr *attr)

{

	return 0;

}



static int kvm_pch_pic_set_attr(struct kvm_device *dev,

				struct kvm_device_attr *attr)

{

	return 0;

}



static int kvm_pch_pic_create(struct kvm_device *dev, u32 type)

{

	struct kvm *kvm = dev->kvm;

	struct loongarch_pch_pic *s;



	/* pch pic should not has been created */

	if (kvm->arch.pch_pic)

		return -EINVAL;



	s = kzalloc(sizeof(struct loongarch_pch_pic), GFP_KERNEL);

	if (!s)

		return -ENOMEM;



	spin_lock_init(&s->lock);

	s->kvm = kvm;

	kvm->arch.pch_pic = s;



	return 0;

}



static void kvm_pch_pic_destroy(struct kvm_device *dev)

{

	struct kvm *kvm;

	struct loongarch_pch_pic *s;



	if (!dev || !dev->kvm || !dev->kvm->arch.pch_pic)

		return;



	kvm = dev->kvm;

	s = kvm->arch.pch_pic;

	/* unregister pch pic device and free it's memory */

	kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &s->device);

	kfree(s);

}



static struct kvm_device_ops kvm_pch_pic_dev_ops = {

	.name = "kvm-loongarch-pch-pic",

	.create = kvm_pch_pic_create,

	.destroy = kvm_pch_pic_destroy,

	.set_attr = kvm_pch_pic_set_attr,

	.get_attr = kvm_pch_pic_get_attr,

};



int kvm_loongarch_register_pch_pic_device(void)

{

	return kvm_register_device_ops(&kvm_pch_pic_dev_ops, KVM_DEV_TYPE_LOONGARCH_PCHPIC);

}

arch/loongarch/kvm/main.c

+6 −0
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
#include <asm/cpufeature.h>

#include <asm/kvm_csr.h>

#include <asm/kvm_eiointc.h>

#include <asm/kvm_pch_pic.h>

#include "trace.h"



unsigned long vpid_mask;
@@ -376,6 +377,11 @@ static int kvm_loongarch_env_init(void) 


	/* Register LoongArch EIOINTC interrupt controller interface. */

	ret = kvm_loongarch_register_eiointc_device();

	if (ret)

		return ret;



	/* Register LoongArch PCH-PIC interrupt controller interface. */

	ret = kvm_loongarch_register_pch_pic_device();



	return ret;

}