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LoongArch: KVM: Add EIOINTC device support
Add device model for EIOINTC interrupt controller, implement basic create & destroy interfaces, and register device model to kvm device table. Signed-off-by: Tianrui Zhao <[email protected]> Signed-off-by: Xianglai Li <[email protected]> Signed-off-by: Huacai Chen <[email protected]>
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‎arch/loongarch/include/asm/kvm_eiointc.h

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@@ -0,0 +1,93 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2024 Loongson Technology Corporation Limited
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*/
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#ifndef __ASM_KVM_EIOINTC_H
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#define __ASM_KVM_EIOINTC_H
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#include <kvm/iodev.h>
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#define EIOINTC_IRQS 256
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#define EIOINTC_ROUTE_MAX_VCPUS 256
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#define EIOINTC_IRQS_U8_NUMS (EIOINTC_IRQS / 8)
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#define EIOINTC_IRQS_U16_NUMS (EIOINTC_IRQS_U8_NUMS / 2)
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#define EIOINTC_IRQS_U32_NUMS (EIOINTC_IRQS_U8_NUMS / 4)
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#define EIOINTC_IRQS_U64_NUMS (EIOINTC_IRQS_U8_NUMS / 8)
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/* map to ipnum per 32 irqs */
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#define EIOINTC_IRQS_NODETYPE_COUNT 16
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#define EIOINTC_BASE 0x1400
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#define EIOINTC_SIZE 0x900
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#define EIOINTC_VIRT_BASE (0x40000000)
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#define EIOINTC_VIRT_SIZE (0x1000)
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#define LOONGSON_IP_NUM 8
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struct loongarch_eiointc {
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spinlock_t lock;
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struct kvm *kvm;
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struct kvm_io_device device;
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struct kvm_io_device device_vext;
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uint32_t num_cpu;
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uint32_t features;
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uint32_t status;
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/* hardware state */
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union nodetype {
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u64 reg_u64[EIOINTC_IRQS_NODETYPE_COUNT / 4];
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u32 reg_u32[EIOINTC_IRQS_NODETYPE_COUNT / 2];
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u16 reg_u16[EIOINTC_IRQS_NODETYPE_COUNT];
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u8 reg_u8[EIOINTC_IRQS_NODETYPE_COUNT * 2];
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} nodetype;
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/* one bit shows the state of one irq */
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union bounce {
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u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
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u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
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u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
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u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
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} bounce;
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union isr {
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u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
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u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
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u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
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u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
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} isr;
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union coreisr {
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u64 reg_u64[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U64_NUMS];
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u32 reg_u32[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U32_NUMS];
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u16 reg_u16[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U16_NUMS];
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u8 reg_u8[EIOINTC_ROUTE_MAX_VCPUS][EIOINTC_IRQS_U8_NUMS];
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} coreisr;
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union enable {
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u64 reg_u64[EIOINTC_IRQS_U64_NUMS];
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u32 reg_u32[EIOINTC_IRQS_U32_NUMS];
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u16 reg_u16[EIOINTC_IRQS_U16_NUMS];
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u8 reg_u8[EIOINTC_IRQS_U8_NUMS];
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} enable;
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/* use one byte to config ipmap for 32 irqs at once */
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union ipmap {
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u64 reg_u64;
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u32 reg_u32[EIOINTC_IRQS_U32_NUMS / 4];
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u16 reg_u16[EIOINTC_IRQS_U16_NUMS / 4];
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u8 reg_u8[EIOINTC_IRQS_U8_NUMS / 4];
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} ipmap;
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/* use one byte to config coremap for one irq */
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union coremap {
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u64 reg_u64[EIOINTC_IRQS / 8];
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u32 reg_u32[EIOINTC_IRQS / 4];
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u16 reg_u16[EIOINTC_IRQS / 2];
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u8 reg_u8[EIOINTC_IRQS];
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} coremap;
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DECLARE_BITMAP(sw_coreisr[EIOINTC_ROUTE_MAX_VCPUS][LOONGSON_IP_NUM], EIOINTC_IRQS);
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uint8_t sw_coremap[EIOINTC_IRQS];
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};
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int kvm_loongarch_register_eiointc_device(void);
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#endif /* __ASM_KVM_EIOINTC_H */

‎arch/loongarch/include/asm/kvm_host.h

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -19,6 +19,7 @@
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#include <asm/inst.h>
2020
#include <asm/kvm_mmu.h>
2121
#include <asm/kvm_ipi.h>
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#include <asm/kvm_eiointc.h>
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#include <asm/loongarch.h>
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2425
/* Loongarch KVM register ids */
@@ -87,7 +88,7 @@ struct kvm_world_switch {
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*
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* For LOONGARCH_CSR_CPUID register, max CPUID size if 512
8990
* For IPI hardware, max destination CPUID size 1024
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* For extioi interrupt controller, max destination CPUID size is 256
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* For eiointc interrupt controller, max destination CPUID size is 256
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* For msgint interrupt controller, max supported CPUID size is 65536
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*
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* Currently max CPUID is defined as 256 for KVM hypervisor, in future
@@ -121,6 +122,7 @@ struct kvm_arch {
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s64 time_offset;
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struct kvm_context __percpu *vmcs;
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struct loongarch_ipi *ipi;
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struct loongarch_eiointc *eiointc;
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};
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126128
#define CSR_MAX_NUMS 0x800

‎arch/loongarch/kvm/Makefile

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Original file line numberDiff line numberDiff line change
@@ -19,5 +19,6 @@ kvm-y += tlb.o
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kvm-y += vcpu.o
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kvm-y += vm.o
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kvm-y += intc/ipi.o
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kvm-y += intc/eiointc.o
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CFLAGS_exit.o += $(call cc-option,-Wno-override-init,)

‎arch/loongarch/kvm/intc/eiointc.c

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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2024 Loongson Technology Corporation Limited
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*/
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#include <asm/kvm_eiointc.h>
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#include <asm/kvm_vcpu.h>
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#include <linux/count_zeros.h>
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static int kvm_eiointc_read(struct kvm_vcpu *vcpu,
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struct kvm_io_device *dev,
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gpa_t addr, int len, void *val)
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{
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return 0;
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}
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static int kvm_eiointc_write(struct kvm_vcpu *vcpu,
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struct kvm_io_device *dev,
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gpa_t addr, int len, const void *val)
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{
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return 0;
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}
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static const struct kvm_io_device_ops kvm_eiointc_ops = {
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.read = kvm_eiointc_read,
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.write = kvm_eiointc_write,
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};
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static int kvm_eiointc_virt_read(struct kvm_vcpu *vcpu,
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struct kvm_io_device *dev,
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gpa_t addr, int len, void *val)
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{
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return 0;
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}
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static int kvm_eiointc_virt_write(struct kvm_vcpu *vcpu,
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struct kvm_io_device *dev,
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gpa_t addr, int len, const void *val)
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{
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return 0;
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}
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static const struct kvm_io_device_ops kvm_eiointc_virt_ops = {
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.read = kvm_eiointc_virt_read,
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.write = kvm_eiointc_virt_write,
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};
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static int kvm_eiointc_get_attr(struct kvm_device *dev,
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struct kvm_device_attr *attr)
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{
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return 0;
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}
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static int kvm_eiointc_set_attr(struct kvm_device *dev,
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struct kvm_device_attr *attr)
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{
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return 0;
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}
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static int kvm_eiointc_create(struct kvm_device *dev, u32 type)
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{
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int ret;
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struct loongarch_eiointc *s;
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struct kvm_io_device *device, *device1;
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struct kvm *kvm = dev->kvm;
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/* eiointc has been created */
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if (kvm->arch.eiointc)
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return -EINVAL;
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s = kzalloc(sizeof(struct loongarch_eiointc), GFP_KERNEL);
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if (!s)
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return -ENOMEM;
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spin_lock_init(&s->lock);
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s->kvm = kvm;
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/*
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* Initialize IOCSR device
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*/
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device = &s->device;
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kvm_iodevice_init(device, &kvm_eiointc_ops);
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mutex_lock(&kvm->slots_lock);
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ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS,
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EIOINTC_BASE, EIOINTC_SIZE, device);
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mutex_unlock(&kvm->slots_lock);
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if (ret < 0) {
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kfree(s);
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return ret;
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}
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device1 = &s->device_vext;
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kvm_iodevice_init(device1, &kvm_eiointc_virt_ops);
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ret = kvm_io_bus_register_dev(kvm, KVM_IOCSR_BUS,
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EIOINTC_VIRT_BASE, EIOINTC_VIRT_SIZE, device1);
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if (ret < 0) {
97+
kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, &s->device);
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kfree(s);
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return ret;
100+
}
101+
kvm->arch.eiointc = s;
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return 0;
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}
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static void kvm_eiointc_destroy(struct kvm_device *dev)
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{
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struct kvm *kvm;
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struct loongarch_eiointc *eiointc;
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if (!dev || !dev->kvm || !dev->kvm->arch.eiointc)
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return;
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kvm = dev->kvm;
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eiointc = kvm->arch.eiointc;
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kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, &eiointc->device);
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kvm_io_bus_unregister_dev(kvm, KVM_IOCSR_BUS, &eiointc->device_vext);
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kfree(eiointc);
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}
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static struct kvm_device_ops kvm_eiointc_dev_ops = {
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.name = "kvm-loongarch-eiointc",
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.create = kvm_eiointc_create,
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.destroy = kvm_eiointc_destroy,
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.set_attr = kvm_eiointc_set_attr,
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.get_attr = kvm_eiointc_get_attr,
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};
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int kvm_loongarch_register_eiointc_device(void)
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{
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return kvm_register_device_ops(&kvm_eiointc_dev_ops, KVM_DEV_TYPE_LOONGARCH_EIOINTC);
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}

‎arch/loongarch/kvm/main.c

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Original file line numberDiff line numberDiff line change
@@ -9,6 +9,7 @@
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#include <asm/cacheflush.h>
1010
#include <asm/cpufeature.h>
1111
#include <asm/kvm_csr.h>
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#include <asm/kvm_eiointc.h>
1213
#include "trace.h"
1314

1415
unsigned long vpid_mask;
@@ -370,6 +371,11 @@ static int kvm_loongarch_env_init(void)
370371

371372
/* Register LoongArch IPI interrupt controller interface. */
372373
ret = kvm_loongarch_register_ipi_device();
374+
if (ret)
375+
return ret;
376+
377+
/* Register LoongArch EIOINTC interrupt controller interface. */
378+
ret = kvm_loongarch_register_eiointc_device();
373379

374380
return ret;
375381
}

‎include/uapi/linux/kvm.h

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Original file line numberDiff line numberDiff line change
@@ -1160,6 +1160,8 @@ enum kvm_device_type {
11601160
#define KVM_DEV_TYPE_RISCV_AIA KVM_DEV_TYPE_RISCV_AIA
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KVM_DEV_TYPE_LOONGARCH_IPI,
11621162
#define KVM_DEV_TYPE_LOONGARCH_IPI KVM_DEV_TYPE_LOONGARCH_IPI
1163+
KVM_DEV_TYPE_LOONGARCH_EIOINTC,
1164+
#define KVM_DEV_TYPE_LOONGARCH_EIOINTC KVM_DEV_TYPE_LOONGARCH_EIOINTC
11631165

11641166
KVM_DEV_TYPE_MAX,
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