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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/kvm/hyp/include/nvhe/trace.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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#ifndef __ARM64_KVM_HYP_NVHE_TRACE_H

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#define __ARM64_KVM_HYP_NVHE_TRACE_H

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#include <linux/trace_remote_event.h>

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#include <asm/kvm_hyptrace.h>

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static inline pid_t __tracing_get_vcpu_pid(struct kvm_cpu_context *host_ctxt)

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{

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	struct kvm_vcpu *vcpu;

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	if (!host_ctxt)

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		host_ctxt = host_data_ptr(host_ctxt);

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	vcpu = host_ctxt->__hyp_running_vcpu;

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	return vcpu ? vcpu->arch.pid : 0;

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}

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#define HE_PROTO(__args...)	__args

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#define HE_ASSIGN(__args...)	__args

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#define HE_STRUCT		RE_STRUCT

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#define he_field		re_field

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#ifdef CONFIG_NVHE_EL2_TRACING

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#define HYP_EVENT(__name, __proto, __struct, __assign, __printk)		\

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	REMOTE_EVENT_FORMAT(__name, __struct);					\

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	extern struct hyp_event_id hyp_event_id_##__name;			\

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	static __always_inline void trace_##__name(__proto)			\

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	{									\

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		struct remote_event_format_##__name *__entry;			\

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		size_t length = sizeof(*__entry);				\

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										\

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		if (!atomic_read(&hyp_event_id_##__name.enabled))		\

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			return;							\

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		__entry = tracing_reserve_entry(length);			\

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		if (!__entry)							\

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			return;							\

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		__entry->hdr.id = hyp_event_id_##__name.id;			\

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		__assign							\

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		tracing_commit_entry();						\

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	}

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void *tracing_reserve_entry(unsigned long length);

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void tracing_commit_entry(void);

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int __tracing_load(unsigned long desc_va, size_t desc_size);

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void __tracing_unload(void);

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int __tracing_enable(bool enable);

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int __tracing_swap_reader(unsigned int cpu);

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void __tracing_update_clock(u32 mult, u32 shift, u64 epoch_ns, u64 epoch_cyc);

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int __tracing_reset(unsigned int cpu);

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int __tracing_enable_event(unsigned short id, bool enable);

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#else

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static inline void *tracing_reserve_entry(unsigned long length) { return NULL; }

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static inline void tracing_commit_entry(void) { }

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#define HYP_EVENT(__name, __proto, __struct, __assign, __printk)      \

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	static inline void trace_##__name(__proto) {}

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static inline int __tracing_load(unsigned long desc_va, size_t desc_size) { return -ENODEV; }

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static inline void __tracing_unload(void) { }

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static inline int __tracing_enable(bool enable) { return -ENODEV; }

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static inline int __tracing_swap_reader(unsigned int cpu) { return -ENODEV; }

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static inline void __tracing_update_clock(u32 mult, u32 shift, u64 epoch_ns, u64 epoch_cyc) { }

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static inline int __tracing_reset(unsigned int cpu) { return -ENODEV; }

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static inline int __tracing_enable_event(unsigned short id, bool enable)  { return -ENODEV; }

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#endif

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#endif

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