arch/riscv/include/asm/kvm_aia.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2021 Western Digital Corporation or its affiliates.
   4  * Copyright (C) 2022 Ventana Micro Systems Inc.
   5  *
   6  * Authors:
   7  *      Anup Patel <[email protected]>
   8  */
   9
  10 #ifndef __KVM_RISCV_AIA_H
  11 #define __KVM_RISCV_AIA_H
  12
  13 #include <linux/jump_label.h>
  14 #include <linux/kvm_types.h>
  15 #include <asm/csr.h>
  16
  17 struct kvm_aia {
  18         /* In-kernel irqchip created */
  19         bool            in_kernel;
  20
  21         /* In-kernel irqchip initialized */
  22         bool            initialized;
  23 };
  24
  25 struct kvm_vcpu_aia_csr {
  26         unsigned long vsiselect;
  27         unsigned long hviprio1;
  28         unsigned long hviprio2;
  29         unsigned long vsieh;
  30         unsigned long hviph;
  31         unsigned long hviprio1h;
  32         unsigned long hviprio2h;
  33 };
  34
  35 struct kvm_vcpu_aia {
  36         /* CPU AIA CSR context of Guest VCPU */
  37         struct kvm_vcpu_aia_csr guest_csr;
  38
  39         /* CPU AIA CSR context upon Guest VCPU reset */
  40         struct kvm_vcpu_aia_csr guest_reset_csr;
  41 };
  42
  43 #define kvm_riscv_aia_initialized(k)    ((k)->arch.aia.initialized)
  44
  45 #define irqchip_in_kernel(k)            ((k)->arch.aia.in_kernel)
  46
  47 DECLARE_STATIC_KEY_FALSE(kvm_riscv_aia_available);
  48 #define kvm_riscv_aia_available() \
  49         static_branch_unlikely(&kvm_riscv_aia_available)
  50
  51 #define KVM_RISCV_AIA_IMSIC_TOPEI       (ISELECT_MASK + 1)
  52 static inline int kvm_riscv_vcpu_aia_imsic_rmw(struct kvm_vcpu *vcpu,
  53                                                unsigned long isel,
  54                                                unsigned long *val,
  55                                                unsigned long new_val,
  56                                                unsigned long wr_mask)
  57 {
  58         return 0;
  59 }
  60
  61 #ifdef CONFIG_32BIT
  62 void kvm_riscv_vcpu_aia_flush_interrupts(struct kvm_vcpu *vcpu);
  63 void kvm_riscv_vcpu_aia_sync_interrupts(struct kvm_vcpu *vcpu);
  64 #else
  65 static inline void kvm_riscv_vcpu_aia_flush_interrupts(struct kvm_vcpu *vcpu)
  66 {
  67 }
  68 static inline void kvm_riscv_vcpu_aia_sync_interrupts(struct kvm_vcpu *vcpu)
  69 {
  70 }
  71 #endif
  72 bool kvm_riscv_vcpu_aia_has_interrupts(struct kvm_vcpu *vcpu, u64 mask);
  73
  74 void kvm_riscv_vcpu_aia_update_hvip(struct kvm_vcpu *vcpu);
  75 void kvm_riscv_vcpu_aia_load(struct kvm_vcpu *vcpu, int cpu);
  76 void kvm_riscv_vcpu_aia_put(struct kvm_vcpu *vcpu);
  77 int kvm_riscv_vcpu_aia_get_csr(struct kvm_vcpu *vcpu,
  78                                unsigned long reg_num,
  79                                unsigned long *out_val);
  80 int kvm_riscv_vcpu_aia_set_csr(struct kvm_vcpu *vcpu,
  81                                unsigned long reg_num,
  82                                unsigned long val);
  83
  84 int kvm_riscv_vcpu_aia_rmw_topei(struct kvm_vcpu *vcpu,
  85                                  unsigned int csr_num,
  86                                  unsigned long *val,
  87                                  unsigned long new_val,
  88                                  unsigned long wr_mask);
  89 int kvm_riscv_vcpu_aia_rmw_ireg(struct kvm_vcpu *vcpu, unsigned int csr_num,
  90                                 unsigned long *val, unsigned long new_val,
  91                                 unsigned long wr_mask);
  92 #define KVM_RISCV_VCPU_AIA_CSR_FUNCS \
  93 { .base = CSR_SIREG,      .count = 1, .func = kvm_riscv_vcpu_aia_rmw_ireg }, \
  94 { .base = CSR_STOPEI,     .count = 1, .func = kvm_riscv_vcpu_aia_rmw_topei },
  95
  96 static inline int kvm_riscv_vcpu_aia_update(struct kvm_vcpu *vcpu)
  97 {
  98         return 1;
  99 }
 100
 101 static inline void kvm_riscv_vcpu_aia_reset(struct kvm_vcpu *vcpu)
 102 {
 103 }
 104
 105 static inline int kvm_riscv_vcpu_aia_init(struct kvm_vcpu *vcpu)
 106 {
 107         return 0;
 108 }
 109
 110 static inline void kvm_riscv_vcpu_aia_deinit(struct kvm_vcpu *vcpu)
 111 {
 112 }
 113
 114 static inline void kvm_riscv_aia_init_vm(struct kvm *kvm)
 115 {
 116 }
 117
 118 static inline void kvm_riscv_aia_destroy_vm(struct kvm *kvm)
 119 {
 120 }
 121
 122 void kvm_riscv_aia_enable(void);
 123 void kvm_riscv_aia_disable(void);
 124 int kvm_riscv_aia_init(void);
 125 void kvm_riscv_aia_exit(void);
 126
 127 #endif