Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/powerpc/kvm/book3s_xics.h
26451 views
1
/* SPDX-License-Identifier: GPL-2.0-only */

2
/*

3
 * Copyright 2012 Michael Ellerman, IBM Corporation.

4
 * Copyright 2012 Benjamin Herrenschmidt, IBM Corporation

5
 */

6


7
#ifndef _KVM_PPC_BOOK3S_XICS_H

8
#define _KVM_PPC_BOOK3S_XICS_H

9


10
#ifdef CONFIG_KVM_XICS

11
/*

12
 * We use a two-level tree to store interrupt source information.

13
 * There are up to 1024 ICS nodes, each of which can represent

14
 * 1024 sources.

15
 */

16
#define KVMPPC_XICS_MAX_ICS_ID	1023

17
#define KVMPPC_XICS_ICS_SHIFT	10

18
#define KVMPPC_XICS_IRQ_PER_ICS	(1 << KVMPPC_XICS_ICS_SHIFT)

19
#define KVMPPC_XICS_SRC_MASK	(KVMPPC_XICS_IRQ_PER_ICS - 1)

20


21
/*

22
 * Interrupt source numbers below this are reserved, for example

23
 * 0 is "no interrupt", and 2 is used for IPIs.

24
 */

25
#define KVMPPC_XICS_FIRST_IRQ	16

26
#define KVMPPC_XICS_NR_IRQS	((KVMPPC_XICS_MAX_ICS_ID + 1) * \

27
				 KVMPPC_XICS_IRQ_PER_ICS)

28


29
/* Priority value to use for disabling an interrupt */

30
#define MASKED	0xff

31


32
#define PQ_PRESENTED	1

33
#define PQ_QUEUED	2

34


35
/* State for one irq source */

36
struct ics_irq_state {

37
	u32 number;

38
	u32 server;

39
	u32 pq_state;

40
	u8  priority;

41
	u8  saved_priority;

42
	u8  resend;

43
	u8  masked_pending;

44
	u8  lsi;		/* level-sensitive interrupt */

45
	u8  exists;

46
	int intr_cpu;

47
	u32 host_irq;

48
};

49


50
/* Atomic ICP state, updated with a single compare & swap */

51
union kvmppc_icp_state {

52
	unsigned long raw;

53
	struct {

54
		u8 out_ee:1;

55
		u8 need_resend:1;

56
		u8 cppr;

57
		u8 mfrr;

58
		u8 pending_pri;

59
		u32 xisr;

60
	};

61
};

62


63
/* One bit per ICS */

64
#define ICP_RESEND_MAP_SIZE	(KVMPPC_XICS_MAX_ICS_ID / BITS_PER_LONG + 1)

65


66
struct kvmppc_icp {

67
	struct kvm_vcpu *vcpu;

68
	unsigned long server_num;

69
	union kvmppc_icp_state state;

70
	unsigned long resend_map[ICP_RESEND_MAP_SIZE];

71


72
	/* Real mode might find something too hard, here's the action

73
	 * it might request from virtual mode

74
	 */

75
#define XICS_RM_KICK_VCPU	0x1

76
#define XICS_RM_CHECK_RESEND	0x2

77
#define XICS_RM_NOTIFY_EOI	0x8

78
	u32 rm_action;

79
	struct kvm_vcpu *rm_kick_target;

80
	struct kvmppc_icp *rm_resend_icp;

81
	u32  rm_reject;

82
	u32  rm_eoied_irq;

83


84
	/* Counters for each reason we exited real mode */

85
	unsigned long n_rm_kick_vcpu;

86
	unsigned long n_rm_check_resend;

87
	unsigned long n_rm_notify_eoi;

88
	/* Counters for handling ICP processing in real mode */

89
	unsigned long n_check_resend;

90
	unsigned long n_reject;

91


92
	/* Debug stuff for real mode */

93
	union kvmppc_icp_state rm_dbgstate;

94
	struct kvm_vcpu *rm_dbgtgt;

95
};

96


97
struct kvmppc_ics {

98
	arch_spinlock_t lock;

99
	u16 icsid;

100
	struct ics_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];

101
};

102


103
struct kvmppc_xics {

104
	struct kvm *kvm;

105
	struct kvm_device *dev;

106
	struct dentry *dentry;

107
	u32 max_icsid;

108
	bool real_mode;

109
	bool real_mode_dbg;

110
	u32 err_noics;

111
	u32 err_noicp;

112
	struct kvmppc_ics *ics[KVMPPC_XICS_MAX_ICS_ID + 1];

113
};

114


115
static inline struct kvmppc_icp *kvmppc_xics_find_server(struct kvm *kvm,

116
							 u32 nr)

117
{

118
	struct kvm_vcpu *vcpu = NULL;

119
	unsigned long i;

120


121
	kvm_for_each_vcpu(i, vcpu, kvm) {

122
		if (vcpu->arch.icp && nr == vcpu->arch.icp->server_num)

123
			return vcpu->arch.icp;

124
	}

125
	return NULL;

126
}

127


128
static inline struct kvmppc_ics *kvmppc_xics_find_ics(struct kvmppc_xics *xics,

129
						      u32 irq, u16 *source)

130
{

131
	u32 icsid = irq >> KVMPPC_XICS_ICS_SHIFT;

132
	u16 src = irq & KVMPPC_XICS_SRC_MASK;

133
	struct kvmppc_ics *ics;

134


135
	if (source)

136
		*source = src;

137
	if (icsid > KVMPPC_XICS_MAX_ICS_ID)

138
		return NULL;

139
	ics = xics->ics[icsid];

140
	if (!ics)

141
		return NULL;

142
	return ics;

143
}

144


145
extern unsigned long xics_rm_h_xirr(struct kvm_vcpu *vcpu);

146
extern unsigned long xics_rm_h_xirr_x(struct kvm_vcpu *vcpu);

147
extern int xics_rm_h_ipi(struct kvm_vcpu *vcpu, unsigned long server,

148
			 unsigned long mfrr);

149
extern int xics_rm_h_cppr(struct kvm_vcpu *vcpu, unsigned long cppr);

150
extern int xics_rm_h_eoi(struct kvm_vcpu *vcpu, unsigned long xirr);

151


152
#endif /* CONFIG_KVM_XICS */

153
#endif /* _KVM_PPC_BOOK3S_XICS_H */

154


155