/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright 2017 Benjamin Herrenschmidt, IBM Corporation
*/
#ifndef _KVM_PPC_BOOK3S_XIVE_H
#define _KVM_PPC_BOOK3S_XIVE_H
#ifdef CONFIG_KVM_XICS
#include "book3s_xics.h"
/*
* The XIVE Interrupt source numbers are within the range 0 to
* KVMPPC_XICS_NR_IRQS.
*/
#define KVMPPC_XIVE_FIRST_IRQ 0
#define KVMPPC_XIVE_NR_IRQS KVMPPC_XICS_NR_IRQS
/*
* State for one guest irq source.
*
* For each guest source we allocate a HW interrupt in the XIVE
* which we use for all SW triggers. It will be unused for
* pass-through but it's easier to keep around as the same
* guest interrupt can alternatively be emulated or pass-through
* if a physical device is hot unplugged and replaced with an
* emulated one.
*
* This state structure is very similar to the XICS one with
* additional XIVE specific tracking.
*/
struct kvmppc_xive_irq_state {
bool valid; /* Interrupt entry is valid */
u32 number; /* Guest IRQ number */
u32 ipi_number; /* XIVE IPI HW number */
struct xive_irq_data ipi_data; /* XIVE IPI associated data */
u32 pt_number; /* XIVE Pass-through number if any */
struct xive_irq_data *pt_data; /* XIVE Pass-through associated data */
/* Targetting as set by guest */
u8 guest_priority; /* Guest set priority */
u8 saved_priority; /* Saved priority when masking */
/* Actual targetting */
u32 act_server; /* Actual server */
u8 act_priority; /* Actual priority */
/* Various state bits */
bool in_eoi; /* Synchronize with H_EOI */
bool old_p; /* P bit state when masking */
bool old_q; /* Q bit state when masking */
bool lsi; /* level-sensitive interrupt */
bool asserted; /* Only for emulated LSI: current state */
/* Saved for migration state */
bool in_queue;
bool saved_p;
bool saved_q;
u8 saved_scan_prio;
/* Xive native */
u32 eisn; /* Guest Effective IRQ number */
};
/* Select the "right" interrupt (IPI vs. passthrough) */
static inline void kvmppc_xive_select_irq(struct kvmppc_xive_irq_state *state,
u32 *out_hw_irq,
struct xive_irq_data **out_xd)
{
if (state->pt_number) {
if (out_hw_irq)
*out_hw_irq = state->pt_number;
if (out_xd)
*out_xd = state->pt_data;
} else {
if (out_hw_irq)
*out_hw_irq = state->ipi_number;
if (out_xd)
*out_xd = &state->ipi_data;
}
}
/*
* This corresponds to an "ICS" in XICS terminology, we use it
* as a mean to break up source information into multiple structures.
*/
struct kvmppc_xive_src_block {
arch_spinlock_t lock;
u16 id;
struct kvmppc_xive_irq_state irq_state[KVMPPC_XICS_IRQ_PER_ICS];
};
struct kvmppc_xive;
struct kvmppc_xive_ops {
int (*reset_mapped)(struct kvm *kvm, unsigned long guest_irq);
};
#define KVMPPC_XIVE_FLAG_SINGLE_ESCALATION 0x1
#define KVMPPC_XIVE_FLAG_SAVE_RESTORE 0x2
struct kvmppc_xive {
struct kvm *kvm;
struct kvm_device *dev;
struct dentry *dentry;
/* VP block associated with the VM */
u32 vp_base;
/* Blocks of sources */
struct kvmppc_xive_src_block *src_blocks[KVMPPC_XICS_MAX_ICS_ID + 1];
u32 max_sbid;
/*
* For state save, we lazily scan the queues on the first interrupt
* being migrated. We don't have a clean way to reset that flags
* so we keep track of the number of valid sources and how many of
* them were migrated so we can reset when all of them have been
* processed.
*/
u32 src_count;
u32 saved_src_count;
/*
* Some irqs are delayed on restore until the source is created,
* keep track here of how many of them
*/
u32 delayed_irqs;
/* Which queues (priorities) are in use by the guest */
u8 qmap;
/* Queue orders */
u32 q_order;
u32 q_page_order;
/* Flags */
u8 flags;
/* Number of entries in the VP block */
u32 nr_servers;
struct kvmppc_xive_ops *ops;
struct address_space *mapping;
struct mutex mapping_lock;
struct mutex lock;
};
#define KVMPPC_XIVE_Q_COUNT 8
struct kvmppc_xive_vcpu {
struct kvmppc_xive *xive;
struct kvm_vcpu *vcpu;
bool valid;
/* Server number. This is the HW CPU ID from a guest perspective */
u32 server_num;
/*
* HW VP corresponding to this VCPU. This is the base of the VP
* block plus the server number.
*/
u32 vp_id;
u32 vp_chip_id;
u32 vp_cam;
/* IPI used for sending ... IPIs */
u32 vp_ipi;
struct xive_irq_data vp_ipi_data;
/* Local emulation state */
uint8_t cppr; /* guest CPPR */
uint8_t hw_cppr;/* Hardware CPPR */
uint8_t mfrr;
uint8_t pending;
/* Each VP has 8 queues though we only provision some */
struct xive_q queues[KVMPPC_XIVE_Q_COUNT];
u32 esc_virq[KVMPPC_XIVE_Q_COUNT];
char *esc_virq_names[KVMPPC_XIVE_Q_COUNT];
/* Stash a delayed irq on restore from migration (see set_icp) */
u32 delayed_irq;
/* Stats */
u64 stat_rm_h_xirr;
u64 stat_rm_h_ipoll;
u64 stat_rm_h_cppr;
u64 stat_rm_h_eoi;
u64 stat_rm_h_ipi;
u64 stat_vm_h_xirr;
u64 stat_vm_h_ipoll;
u64 stat_vm_h_cppr;
u64 stat_vm_h_eoi;
u64 stat_vm_h_ipi;
};
static inline struct kvm_vcpu *kvmppc_xive_find_server(struct kvm *kvm, u32 nr)
{
struct kvm_vcpu *vcpu = NULL;
unsigned long i;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.xive_vcpu && nr == vcpu->arch.xive_vcpu->server_num)
return vcpu;
}
return NULL;
}
static inline struct kvmppc_xive_src_block *kvmppc_xive_find_source(struct kvmppc_xive *xive,
u32 irq, u16 *source)
{
u32 bid = irq >> KVMPPC_XICS_ICS_SHIFT;
u16 src = irq & KVMPPC_XICS_SRC_MASK;
if (source)
*source = src;
if (bid > KVMPPC_XICS_MAX_ICS_ID)
return NULL;
return xive->src_blocks[bid];
}
/*
* When the XIVE resources are allocated at the HW level, the VP
* structures describing the vCPUs of a guest are distributed among
* the chips to optimize the PowerBUS usage. For best performance, the
* guest vCPUs can be pinned to match the VP structure distribution.
*
* Currently, the VP identifiers are deduced from the vCPU id using
* the kvmppc_pack_vcpu_id() routine which is not incorrect but not
* optimal either. It VSMT is used, the result is not continuous and
* the constraints on HW resources described above can not be met.
*/
static inline u32 kvmppc_xive_vp(struct kvmppc_xive *xive, u32 server)
{
return xive->vp_base + kvmppc_pack_vcpu_id(xive->kvm, server);
}
static inline bool kvmppc_xive_vp_in_use(struct kvm *kvm, u32 vp_id)
{
struct kvm_vcpu *vcpu = NULL;
unsigned long i;
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->arch.xive_vcpu && vp_id == vcpu->arch.xive_vcpu->vp_id)
return true;
}
return false;
}
/*
* Mapping between guest priorities and host priorities
* is as follow.
*
* Guest request for 0...6 are honored. Guest request for anything
* higher results in a priority of 6 being applied.
*
* Similar mapping is done for CPPR values
*/
static inline u8 xive_prio_from_guest(u8 prio)
{
if (prio == 0xff || prio < 6)
return prio;
return 6;
}
static inline u8 xive_prio_to_guest(u8 prio)
{
return prio;
}
static inline u32 __xive_read_eq(__be32 *qpage, u32 msk, u32 *idx, u32 *toggle)
{
u32 cur;
if (!qpage)
return 0;
cur = be32_to_cpup(qpage + *idx);
if ((cur >> 31) == *toggle)
return 0;
*idx = (*idx + 1) & msk;
if (*idx == 0)
(*toggle) ^= 1;
return cur & 0x7fffffff;
}
/*
* Common Xive routines for XICS-over-XIVE and XIVE native
*/
void kvmppc_xive_disable_vcpu_interrupts(struct kvm_vcpu *vcpu);
int kvmppc_xive_debug_show_queues(struct seq_file *m, struct kvm_vcpu *vcpu);
void kvmppc_xive_debug_show_sources(struct seq_file *m,
struct kvmppc_xive_src_block *sb);
struct kvmppc_xive_src_block *kvmppc_xive_create_src_block(
struct kvmppc_xive *xive, int irq);
void kvmppc_xive_free_sources(struct kvmppc_xive_src_block *sb);
int kvmppc_xive_select_target(struct kvm *kvm, u32 *server, u8 prio);
int kvmppc_xive_attach_escalation(struct kvm_vcpu *vcpu, u8 prio,
bool single_escalation);
struct kvmppc_xive *kvmppc_xive_get_device(struct kvm *kvm, u32 type);
void xive_cleanup_single_escalation(struct kvm_vcpu *vcpu, int irq);
int kvmppc_xive_compute_vp_id(struct kvmppc_xive *xive, u32 cpu, u32 *vp);
int kvmppc_xive_set_nr_servers(struct kvmppc_xive *xive, u64 addr);
bool kvmppc_xive_check_save_restore(struct kvm_vcpu *vcpu);
static inline bool kvmppc_xive_has_single_escalation(struct kvmppc_xive *xive)
{
return xive->flags & KVMPPC_XIVE_FLAG_SINGLE_ESCALATION;
}
#endif /* CONFIG_KVM_XICS */
#endif /* _KVM_PPC_BOOK3S_XICS_H */