Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2010,2012 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Varun Sethi, <varun.sethi@freescale.com>
 *
 * Description:
 * This file is derived from arch/powerpc/kvm/e500.c,
 * by Yu Liu <yu.liu@freescale.com>.
 */
 
#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
 
#include <asm/reg.h>
#include <asm/cputable.h>
#include <asm/kvm_ppc.h>
#include <asm/dbell.h>
 
#include "booke.h"
#include "e500.h"
 
void kvmppc_set_pending_interrupt(struct kvm_vcpu *vcpu, enum int_class type)
{
<------>enum ppc_dbell dbell_type;
<------>unsigned long tag;
 
<------>switch (type) {
<------>case INT_CLASS_NONCRIT:
<------><------>dbell_type = PPC_G_DBELL;
<------><------>break;
<------>case INT_CLASS_CRIT:
<------><------>dbell_type = PPC_G_DBELL_CRIT;
<------><------>break;
<------>case INT_CLASS_MC:
<------><------>dbell_type = PPC_G_DBELL_MC;
<------><------>break;
<------>default:
<------><------>WARN_ONCE(1, "%s: unknown int type %d\n", __func__, type);
<------><------>return;
<------>}
 
<------>preempt_disable();
<------>tag = PPC_DBELL_LPID(get_lpid(vcpu)) | vcpu->vcpu_id;
<------>mb();
<------>ppc_msgsnd(dbell_type, 0, tag);
<------>preempt_enable();
}
 
/* gtlbe must not be mapped by more than one host tlb entry */
void kvmppc_e500_tlbil_one(struct kvmppc_vcpu_e500 *vcpu_e500,
<------><------><------>   struct kvm_book3e_206_tlb_entry *gtlbe)
{
<------>unsigned int tid, ts;
<------>gva_t eaddr;
<------>u32 val;
<------>unsigned long flags;
 
<------>ts = get_tlb_ts(gtlbe);
<------>tid = get_tlb_tid(gtlbe);
 
<------>/* We search the host TLB to invalidate its shadow TLB entry */
<------>val = (tid << 16) | ts;
<------>eaddr = get_tlb_eaddr(gtlbe);
 
<------>local_irq_save(flags);
 
<------>mtspr(SPRN_MAS6, val);
<------>mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
 
<------>asm volatile("tlbsx 0, %[eaddr]\n" : : [eaddr] "r" (eaddr));
<------>val = mfspr(SPRN_MAS1);
<------>if (val & MAS1_VALID) {
<------><------>mtspr(SPRN_MAS1, val & ~MAS1_VALID);
<------><------>asm volatile("tlbwe");
<------>}
<------>mtspr(SPRN_MAS5, 0);
<------>/* NOTE: tlbsx also updates mas8, so clear it for host tlbwe */
<------>mtspr(SPRN_MAS8, 0);
<------>isync();
 
<------>local_irq_restore(flags);
}
 
void kvmppc_e500_tlbil_all(struct kvmppc_vcpu_e500 *vcpu_e500)
{
<------>unsigned long flags;
 
<------>local_irq_save(flags);
<------>mtspr(SPRN_MAS5, MAS5_SGS | get_lpid(&vcpu_e500->vcpu));
<------>asm volatile("tlbilxlpid");
<------>mtspr(SPRN_MAS5, 0);
<------>local_irq_restore(flags);
}
 
void kvmppc_set_pid(struct kvm_vcpu *vcpu, u32 pid)
{
<------>vcpu->arch.pid = pid;
}
 
void kvmppc_mmu_msr_notify(struct kvm_vcpu *vcpu, u32 old_msr)
{
}
 
/* We use two lpids per VM */
static DEFINE_PER_CPU(struct kvm_vcpu *[KVMPPC_NR_LPIDS], last_vcpu_of_lpid);
 
static void kvmppc_core_vcpu_load_e500mc(struct kvm_vcpu *vcpu, int cpu)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 
<------>kvmppc_booke_vcpu_load(vcpu, cpu);
 
<------>mtspr(SPRN_LPID, get_lpid(vcpu));
<------>mtspr(SPRN_EPCR, vcpu->arch.shadow_epcr);
<------>mtspr(SPRN_GPIR, vcpu->vcpu_id);
<------>mtspr(SPRN_MSRP, vcpu->arch.shadow_msrp);
<------>vcpu->arch.eplc = EPC_EGS | (get_lpid(vcpu) << EPC_ELPID_SHIFT);
<------>vcpu->arch.epsc = vcpu->arch.eplc;
<------>mtspr(SPRN_EPLC, vcpu->arch.eplc);
<------>mtspr(SPRN_EPSC, vcpu->arch.epsc);
 
<------>mtspr(SPRN_GIVPR, vcpu->arch.ivpr);
<------>mtspr(SPRN_GIVOR2, vcpu->arch.ivor[BOOKE_IRQPRIO_DATA_STORAGE]);
<------>mtspr(SPRN_GIVOR8, vcpu->arch.ivor[BOOKE_IRQPRIO_SYSCALL]);
<------>mtspr(SPRN_GSPRG0, (unsigned long)vcpu->arch.shared->sprg0);
<------>mtspr(SPRN_GSPRG1, (unsigned long)vcpu->arch.shared->sprg1);
<------>mtspr(SPRN_GSPRG2, (unsigned long)vcpu->arch.shared->sprg2);
<------>mtspr(SPRN_GSPRG3, (unsigned long)vcpu->arch.shared->sprg3);
 
<------>mtspr(SPRN_GSRR0, vcpu->arch.shared->srr0);
<------>mtspr(SPRN_GSRR1, vcpu->arch.shared->srr1);
 
<------>mtspr(SPRN_GEPR, vcpu->arch.epr);
<------>mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
<------>mtspr(SPRN_GESR, vcpu->arch.shared->esr);
 
<------>if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
<------>    __this_cpu_read(last_vcpu_of_lpid[get_lpid(vcpu)]) != vcpu) {
<------><------>kvmppc_e500_tlbil_all(vcpu_e500);
<------><------>__this_cpu_write(last_vcpu_of_lpid[get_lpid(vcpu)], vcpu);
<------>}
}
 
static void kvmppc_core_vcpu_put_e500mc(struct kvm_vcpu *vcpu)
{
<------>vcpu->arch.eplc = mfspr(SPRN_EPLC);
<------>vcpu->arch.epsc = mfspr(SPRN_EPSC);
 
<------>vcpu->arch.shared->sprg0 = mfspr(SPRN_GSPRG0);
<------>vcpu->arch.shared->sprg1 = mfspr(SPRN_GSPRG1);
<------>vcpu->arch.shared->sprg2 = mfspr(SPRN_GSPRG2);
<------>vcpu->arch.shared->sprg3 = mfspr(SPRN_GSPRG3);
 
<------>vcpu->arch.shared->srr0 = mfspr(SPRN_GSRR0);
<------>vcpu->arch.shared->srr1 = mfspr(SPRN_GSRR1);
 
<------>vcpu->arch.epr = mfspr(SPRN_GEPR);
<------>vcpu->arch.shared->dar = mfspr(SPRN_GDEAR);
<------>vcpu->arch.shared->esr = mfspr(SPRN_GESR);
 
<------>vcpu->arch.oldpir = mfspr(SPRN_PIR);
 
<------>kvmppc_booke_vcpu_put(vcpu);
}
 
int kvmppc_core_check_processor_compat(void)
{
<------>int r;
 
<------>if (strcmp(cur_cpu_spec->cpu_name, "e500mc") == 0)
<------><------>r = 0;
<------>else if (strcmp(cur_cpu_spec->cpu_name, "e5500") == 0)
<------><------>r = 0;
#ifdef CONFIG_ALTIVEC
<------>/*
<------> * Since guests have the privilege to enable AltiVec, we need AltiVec
<------> * support in the host to save/restore their context.
<------> * Don't use CPU_FTR_ALTIVEC to identify cores with AltiVec unit
<------> * because it's cleared in the absence of CONFIG_ALTIVEC!
<------> */
<------>else if (strcmp(cur_cpu_spec->cpu_name, "e6500") == 0)
<------><------>r = 0;
#endif
<------>else
<------><------>r = -ENOTSUPP;
 
<------>return r;
}
 
int kvmppc_core_vcpu_setup(struct kvm_vcpu *vcpu)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 
<------>vcpu->arch.shadow_epcr = SPRN_EPCR_DSIGS | SPRN_EPCR_DGTMI | \
<------><------><------><------> SPRN_EPCR_DUVD;
#ifdef CONFIG_64BIT
<------>vcpu->arch.shadow_epcr |= SPRN_EPCR_ICM;
#endif
<------>vcpu->arch.shadow_msrp = MSRP_UCLEP | MSRP_PMMP;
 
<------>vcpu->arch.pvr = mfspr(SPRN_PVR);
<------>vcpu_e500->svr = mfspr(SPRN_SVR);
 
<------>vcpu->arch.cpu_type = KVM_CPU_E500MC;
 
<------>return 0;
}
 
static int kvmppc_core_get_sregs_e500mc(struct kvm_vcpu *vcpu,
<------><------><------><------><------>struct kvm_sregs *sregs)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 
<------>sregs->u.e.features |= KVM_SREGS_E_ARCH206_MMU | KVM_SREGS_E_PM |
<------><------><------>       KVM_SREGS_E_PC;
<------>sregs->u.e.impl_id = KVM_SREGS_E_IMPL_FSL;
 
<------>sregs->u.e.impl.fsl.features = 0;
<------>sregs->u.e.impl.fsl.svr = vcpu_e500->svr;
<------>sregs->u.e.impl.fsl.hid0 = vcpu_e500->hid0;
<------>sregs->u.e.impl.fsl.mcar = vcpu_e500->mcar;
 
<------>kvmppc_get_sregs_e500_tlb(vcpu, sregs);
 
<------>sregs->u.e.ivor_high[3] =
<------><------>vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR];
<------>sregs->u.e.ivor_high[4] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL];
<------>sregs->u.e.ivor_high[5] = vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT];
 
<------>return kvmppc_get_sregs_ivor(vcpu, sregs);
}
 
static int kvmppc_core_set_sregs_e500mc(struct kvm_vcpu *vcpu,
<------><------><------><------><------>struct kvm_sregs *sregs)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
<------>int ret;
 
<------>if (sregs->u.e.impl_id == KVM_SREGS_E_IMPL_FSL) {
<------><------>vcpu_e500->svr = sregs->u.e.impl.fsl.svr;
<------><------>vcpu_e500->hid0 = sregs->u.e.impl.fsl.hid0;
<------><------>vcpu_e500->mcar = sregs->u.e.impl.fsl.mcar;
<------>}
 
<------>ret = kvmppc_set_sregs_e500_tlb(vcpu, sregs);
<------>if (ret < 0)
<------><------>return ret;
 
<------>if (!(sregs->u.e.features & KVM_SREGS_E_IVOR))
<------><------>return 0;
 
<------>if (sregs->u.e.features & KVM_SREGS_E_PM) {
<------><------>vcpu->arch.ivor[BOOKE_IRQPRIO_PERFORMANCE_MONITOR] =
<------><------><------>sregs->u.e.ivor_high[3];
<------>}
 
<------>if (sregs->u.e.features & KVM_SREGS_E_PC) {
<------><------>vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL] =
<------><------><------>sregs->u.e.ivor_high[4];
<------><------>vcpu->arch.ivor[BOOKE_IRQPRIO_DBELL_CRIT] =
<------><------><------>sregs->u.e.ivor_high[5];
<------>}
 
<------>return kvmppc_set_sregs_ivor(vcpu, sregs);
}
 
static int kvmppc_get_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
<------><------><------>      union kvmppc_one_reg *val)
{
<------>int r = 0;
 
<------>switch (id) {
<------>case KVM_REG_PPC_SPRG9:
<------><------>*val = get_reg_val(id, vcpu->arch.sprg9);
<------><------>break;
<------>default:
<------><------>r = kvmppc_get_one_reg_e500_tlb(vcpu, id, val);
<------>}
 
<------>return r;
}
 
static int kvmppc_set_one_reg_e500mc(struct kvm_vcpu *vcpu, u64 id,
<------><------><------>      union kvmppc_one_reg *val)
{
<------>int r = 0;
 
<------>switch (id) {
<------>case KVM_REG_PPC_SPRG9:
<------><------>vcpu->arch.sprg9 = set_reg_val(id, *val);
<------><------>break;
<------>default:
<------><------>r = kvmppc_set_one_reg_e500_tlb(vcpu, id, val);
<------>}
 
<------>return r;
}
 
static int kvmppc_core_vcpu_create_e500mc(struct kvm_vcpu *vcpu)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500;
<------>int err;
 
<------>BUILD_BUG_ON(offsetof(struct kvmppc_vcpu_e500, vcpu) != 0);
<------>vcpu_e500 = to_e500(vcpu);
 
<------>/* Invalid PIR value -- this LPID dosn't have valid state on any cpu */
<------>vcpu->arch.oldpir = 0xffffffff;
 
<------>err = kvmppc_e500_tlb_init(vcpu_e500);
<------>if (err)
<------><------>return err;
 
<------>vcpu->arch.shared = (void *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
<------>if (!vcpu->arch.shared) {
<------><------>err = -ENOMEM;
<------><------>goto uninit_tlb;
<------>}
 
<------>return 0;
 
uninit_tlb:
<------>kvmppc_e500_tlb_uninit(vcpu_e500);
<------>return err;
}
 
static void kvmppc_core_vcpu_free_e500mc(struct kvm_vcpu *vcpu)
{
<------>struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
 
<------>free_page((unsigned long)vcpu->arch.shared);
<------>kvmppc_e500_tlb_uninit(vcpu_e500);
}
 
static int kvmppc_core_init_vm_e500mc(struct kvm *kvm)
{
<------>int lpid;
 
<------>lpid = kvmppc_alloc_lpid();
<------>if (lpid < 0)
<------><------>return lpid;
 
<------>/*
<------> * Use two lpids per VM on cores with two threads like e6500. Use
<------> * even numbers to speedup vcpu lpid computation with consecutive lpids
<------> * per VM. vm1 will use lpids 2 and 3, vm2 lpids 4 and 5, and so on.
<------> */
<------>if (threads_per_core == 2)
<------><------>lpid <<= 1;
 
<------>kvm->arch.lpid = lpid;
<------>return 0;
}
 
static void kvmppc_core_destroy_vm_e500mc(struct kvm *kvm)
{
<------>int lpid = kvm->arch.lpid;
 
<------>if (threads_per_core == 2)
<------><------>lpid >>= 1;
 
<------>kvmppc_free_lpid(lpid);
}
 
static struct kvmppc_ops kvm_ops_e500mc = {
<------>.get_sregs = kvmppc_core_get_sregs_e500mc,
<------>.set_sregs = kvmppc_core_set_sregs_e500mc,
<------>.get_one_reg = kvmppc_get_one_reg_e500mc,
<------>.set_one_reg = kvmppc_set_one_reg_e500mc,
<------>.vcpu_load   = kvmppc_core_vcpu_load_e500mc,
<------>.vcpu_put    = kvmppc_core_vcpu_put_e500mc,
<------>.vcpu_create = kvmppc_core_vcpu_create_e500mc,
<------>.vcpu_free   = kvmppc_core_vcpu_free_e500mc,
<------>.init_vm = kvmppc_core_init_vm_e500mc,
<------>.destroy_vm = kvmppc_core_destroy_vm_e500mc,
<------>.emulate_op = kvmppc_core_emulate_op_e500,
<------>.emulate_mtspr = kvmppc_core_emulate_mtspr_e500,
<------>.emulate_mfspr = kvmppc_core_emulate_mfspr_e500,
};
 
static int __init kvmppc_e500mc_init(void)
{
<------>int r;
 
<------>r = kvmppc_booke_init();
<------>if (r)
<------><------>goto err_out;
 
<------>/*
<------> * Use two lpids per VM on dual threaded processors like e6500
<------> * to workarround the lack of tlb write conditional instruction.
<------> * Expose half the number of available hardware lpids to the lpid
<------> * allocator.
<------> */
<------>kvmppc_init_lpid(KVMPPC_NR_LPIDS/threads_per_core);
<------>kvmppc_claim_lpid(0); /* host */
 
<------>r = kvm_init(NULL, sizeof(struct kvmppc_vcpu_e500), 0, THIS_MODULE);
<------>if (r)
<------><------>goto err_out;
<------>kvm_ops_e500mc.owner = THIS_MODULE;
<------>kvmppc_pr_ops = &kvm_ops_e500mc;
 
err_out:
<------>return r;
}
 
static void __exit kvmppc_e500mc_exit(void)
{
<------>kvmppc_pr_ops = NULL;
<------>kvmppc_booke_exit();
}
 
module_init(kvmppc_e500mc_init);
module_exit(kvmppc_e500mc_exit);
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");