tools/testing/selftests/bpf/progs/pyperf.h - linux/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2019 Facebook
 #include <linux/sched.h>
 #include <linux/ptrace.h>
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
 #include <linux/bpf.h>
 #include "bpf_helpers.h"

 #define FUNCTION_NAME_LEN 64
 #define FILE_NAME_LEN 128
 #define TASK_COMM_LEN 16

 typedef struct {
 	int PyThreadState_frame;
 	int PyThreadState_thread;
 	int PyFrameObject_back;
 	int PyFrameObject_code;
 	int PyFrameObject_lineno;
 	int PyCodeObject_filename;
 	int PyCodeObject_name;
 	int String_data;
 	int String_size;
 } OffsetConfig;

 typedef struct {
 	uintptr_t current_state_addr;
 	uintptr_t tls_key_addr;
 	OffsetConfig offsets;
 	bool use_tls;
 } PidData;

 typedef struct {
 	uint32_t success;
 } Stats;

 typedef struct {
 	char name[FUNCTION_NAME_LEN];
 	char file[FILE_NAME_LEN];
 } Symbol;

 typedef struct {
 	uint32_t pid;
 	uint32_t tid;
 	char comm[TASK_COMM_LEN];
 	int32_t kernel_stack_id;
 	int32_t user_stack_id;
 	bool thread_current;
 	bool pthread_match;
 	bool stack_complete;
 	int16_t stack_len;
 	int32_t stack[STACK_MAX_LEN];

 	int has_meta;
 	int metadata;
 	char dummy_safeguard;
 } Event;


 typedef int pid_t;

 typedef struct {
 	void* f_back; // PyFrameObject.f_back, previous frame
 	void* f_code; // PyFrameObject.f_code, pointer to PyCodeObject
 	void* co_filename; // PyCodeObject.co_filename
 	void* co_name; // PyCodeObject.co_name
 } FrameData;

 static __always_inline void *get_thread_state(void *tls_base, PidData *pidData)
 {
 	void* thread_state;
 	int key;

 	bpf_probe_read(&key, sizeof(key), (void*)(long)pidData->tls_key_addr);
 	bpf_probe_read(&thread_state, sizeof(thread_state),
 		       tls_base + 0x310 + key * 0x10 + 0x08);
 	return thread_state;
 }

 static __always_inline bool get_frame_data(void *frame_ptr, PidData *pidData,
 					   FrameData *frame, Symbol *symbol)
 {
 	// read data from PyFrameObject
 	bpf_probe_read(&frame->f_back,
 		       sizeof(frame->f_back),
 		       frame_ptr + pidData->offsets.PyFrameObject_back);
 	bpf_probe_read(&frame->f_code,
 		       sizeof(frame->f_code),
 		       frame_ptr + pidData->offsets.PyFrameObject_code);

 	// read data from PyCodeObject
 	if (!frame->f_code)
 		return false;
 	bpf_probe_read(&frame->co_filename,
 		       sizeof(frame->co_filename),
 		       frame->f_code + pidData->offsets.PyCodeObject_filename);
 	bpf_probe_read(&frame->co_name,
 		       sizeof(frame->co_name),
 		       frame->f_code + pidData->offsets.PyCodeObject_name);
 	// read actual names into symbol
 	if (frame->co_filename)
 		bpf_probe_read_str(&symbol->file,
 				   sizeof(symbol->file),
 				   frame->co_filename + pidData->offsets.String_data);
 	if (frame->co_name)
 		bpf_probe_read_str(&symbol->name,
 				   sizeof(symbol->name),
 				   frame->co_name + pidData->offsets.String_data);
 	return true;
 }

 struct {
 	__uint(type, BPF_MAP_TYPE_HASH);
 	__uint(max_entries, 1);
 	__type(key, int);
 	__type(value, PidData);
 } pidmap SEC(".maps");

 struct {
 	__uint(type, BPF_MAP_TYPE_HASH);
 	__uint(max_entries, 1);
 	__type(key, int);
 	__type(value, Event);
 } eventmap SEC(".maps");

 struct {
 	__uint(type, BPF_MAP_TYPE_HASH);
 	__uint(max_entries, 1);
 	__type(key, Symbol);
 	__type(value, int);
 } symbolmap SEC(".maps");

 struct {
 	__uint(type, BPF_MAP_TYPE_ARRAY);
 	__uint(max_entries, 1);
 	__type(key, int);
 	__type(value, Stats);
 } statsmap SEC(".maps");

 struct {
 	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
 	__uint(max_entries, 32);
 	__uint(key_size, sizeof(int));
 	__uint(value_size, sizeof(int));
 } perfmap SEC(".maps");

 struct {
 	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
 	__uint(max_entries, 1000);
 	__uint(key_size, sizeof(int));
 	__uint(value_size, sizeof(long long) * 127);
 } stackmap SEC(".maps");

 static __always_inline int __on_event(struct pt_regs *ctx)
 {
 	uint64_t pid_tgid = bpf_get_current_pid_tgid();
 	pid_t pid = (pid_t)(pid_tgid >> 32);
 	PidData* pidData = bpf_map_lookup_elem(&pidmap, &pid);
 	if (!pidData)
 		return 0;

 	int zero = 0;
 	Event* event = bpf_map_lookup_elem(&eventmap, &zero);
 	if (!event)
 		return 0;

 	event->pid = pid;

 	event->tid = (pid_t)pid_tgid;
 	bpf_get_current_comm(&event->comm, sizeof(event->comm));

 	event->user_stack_id = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
 	event->kernel_stack_id = bpf_get_stackid(ctx, &stackmap, 0);

 	void* thread_state_current = (void*)0;
 	bpf_probe_read(&thread_state_current,
 		       sizeof(thread_state_current),
 		       (void*)(long)pidData->current_state_addr);

 	struct task_struct* task = (struct task_struct*)bpf_get_current_task();
 	void* tls_base = (void*)task;

 	void* thread_state = pidData->use_tls ? get_thread_state(tls_base, pidData)
 		: thread_state_current;
 	event->thread_current = thread_state == thread_state_current;

 	if (pidData->use_tls) {
 		uint64_t pthread_created;
 		uint64_t pthread_self;
 		bpf_probe_read(&pthread_self, sizeof(pthread_self), tls_base + 0x10);

 		bpf_probe_read(&pthread_created,
 			       sizeof(pthread_created),
 			       thread_state + pidData->offsets.PyThreadState_thread);
 		event->pthread_match = pthread_created == pthread_self;
 	} else {
 		event->pthread_match = 1;
 	}

 	if (event->pthread_match || !pidData->use_tls) {
 		void* frame_ptr;
 		FrameData frame;
 		Symbol sym = {};
 		int cur_cpu = bpf_get_smp_processor_id();

 		bpf_probe_read(&frame_ptr,
 			       sizeof(frame_ptr),
 			       thread_state + pidData->offsets.PyThreadState_frame);

 		int32_t* symbol_counter = bpf_map_lookup_elem(&symbolmap, &sym);
 		if (symbol_counter == NULL)
 			return 0;
 #ifdef NO_UNROLL
 #pragma clang loop unroll(disable)
 #else
 #pragma clang loop unroll(full)
 #endif
 		/* Unwind python stack */
 		for (int i = 0; i < STACK_MAX_LEN; ++i) {
 			if (frame_ptr && get_frame_data(frame_ptr, pidData, &frame, &sym)) {
 				int32_t new_symbol_id = *symbol_counter * 64 + cur_cpu;
 				int32_t *symbol_id = bpf_map_lookup_elem(&symbolmap, &sym);
 				if (!symbol_id) {
 					bpf_map_update_elem(&symbolmap, &sym, &zero, 0);
 					symbol_id = bpf_map_lookup_elem(&symbolmap, &sym);
 					if (!symbol_id)
 						return 0;
 				}
 				if (*symbol_id == new_symbol_id)
 					(*symbol_counter)++;
 				event->stack[i] = *symbol_id;
 				event->stack_len = i + 1;
 				frame_ptr = frame.f_back;
 			}
 		}
 		event->stack_complete = frame_ptr == NULL;
 	} else {
 		event->stack_complete = 1;
 	}

 	Stats* stats = bpf_map_lookup_elem(&statsmap, &zero);
 	if (stats)
 		stats->success++;

 	event->has_meta = 0;
 	bpf_perf_event_output(ctx, &perfmap, 0, event, offsetof(Event, metadata));
 	return 0;
 }

 SEC("raw_tracepoint/kfree_skb")
 int on_event(struct pt_regs* ctx)
 {
 	int i, ret = 0;
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);
 	ret |= __on_event(ctx);
 	return ret;
 }

 char _license[] SEC("license") = "GPL";
	// SPDX-License-Identifier: GPL-2.0
	// Copyright (c) 2019 Facebook
	#include <linux/sched.h>
	#include <linux/ptrace.h>
	#include <stdint.h>
	#include <stddef.h>
	#include <stdbool.h>
	#include <linux/bpf.h>
	#include "bpf_helpers.h"

	#define FUNCTION_NAME_LEN 64
	#define FILE_NAME_LEN 128
	#define TASK_COMM_LEN 16

	typedef struct {
	int PyThreadState_frame;
	int PyThreadState_thread;
	int PyFrameObject_back;
	int PyFrameObject_code;
	int PyFrameObject_lineno;
	int PyCodeObject_filename;
	int PyCodeObject_name;
	int String_data;
	int String_size;
	} OffsetConfig;

	typedef struct {
	uintptr_t current_state_addr;
	uintptr_t tls_key_addr;
	OffsetConfig offsets;
	bool use_tls;
	} PidData;

	typedef struct {
	uint32_t success;
	} Stats;

	typedef struct {
	char name[FUNCTION_NAME_LEN];
	char file[FILE_NAME_LEN];
	} Symbol;

	typedef struct {
	uint32_t pid;
	uint32_t tid;
	char comm[TASK_COMM_LEN];
	int32_t kernel_stack_id;
	int32_t user_stack_id;
	bool thread_current;
	bool pthread_match;
	bool stack_complete;
	int16_t stack_len;
	int32_t stack[STACK_MAX_LEN];

	int has_meta;
	int metadata;
	char dummy_safeguard;
	} Event;


	typedef int pid_t;

	typedef struct {
	void* f_back; // PyFrameObject.f_back, previous frame
	void* f_code; // PyFrameObject.f_code, pointer to PyCodeObject
	void* co_filename; // PyCodeObject.co_filename
	void* co_name; // PyCodeObject.co_name
	} FrameData;

	static __always_inline void get_thread_state(void tls_base, PidData *pidData)
	{
	void* thread_state;
	int key;

	bpf_probe_read(&key, sizeof(key), (void*)(long)pidData->tls_key_addr);
	bpf_probe_read(&thread_state, sizeof(thread_state),
	tls_base + 0x310 + key * 0x10 + 0x08);
	return thread_state;
	}

	static __always_inline bool get_frame_data(void frame_ptr, PidData pidData,
	FrameData frame, Symbol symbol)
	{
	// read data from PyFrameObject
	bpf_probe_read(&frame->f_back,
	sizeof(frame->f_back),
	frame_ptr + pidData->offsets.PyFrameObject_back);
	bpf_probe_read(&frame->f_code,
	sizeof(frame->f_code),
	frame_ptr + pidData->offsets.PyFrameObject_code);

	// read data from PyCodeObject
	if (!frame->f_code)
	return false;
	bpf_probe_read(&frame->co_filename,
	sizeof(frame->co_filename),
	frame->f_code + pidData->offsets.PyCodeObject_filename);
	bpf_probe_read(&frame->co_name,
	sizeof(frame->co_name),
	frame->f_code + pidData->offsets.PyCodeObject_name);
	// read actual names into symbol
	if (frame->co_filename)
	bpf_probe_read_str(&symbol->file,
	sizeof(symbol->file),
	frame->co_filename + pidData->offsets.String_data);
	if (frame->co_name)
	bpf_probe_read_str(&symbol->name,
	sizeof(symbol->name),
	frame->co_name + pidData->offsets.String_data);
	return true;
	}

	struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, PidData);
	} pidmap SEC(".maps");

	struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, Event);
	} eventmap SEC(".maps");

	struct {
	__uint(type, BPF_MAP_TYPE_HASH);
	__uint(max_entries, 1);
	__type(key, Symbol);
	__type(value, int);
	} symbolmap SEC(".maps");

	struct {
	__uint(type, BPF_MAP_TYPE_ARRAY);
	__uint(max_entries, 1);
	__type(key, int);
	__type(value, Stats);
	} statsmap SEC(".maps");

	struct {
	__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
	__uint(max_entries, 32);
	__uint(key_size, sizeof(int));
	__uint(value_size, sizeof(int));
	} perfmap SEC(".maps");

	struct {
	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
	__uint(max_entries, 1000);
	__uint(key_size, sizeof(int));
	__uint(value_size, sizeof(long long) * 127);
	} stackmap SEC(".maps");

	static __always_inline int __on_event(struct pt_regs *ctx)
	{
	uint64_t pid_tgid = bpf_get_current_pid_tgid();
	pid_t pid = (pid_t)(pid_tgid >> 32);
	PidData* pidData = bpf_map_lookup_elem(&pidmap, &pid);
	if (!pidData)
	return 0;

	int zero = 0;
	Event* event = bpf_map_lookup_elem(&eventmap, &zero);
	if (!event)
	return 0;

	event->pid = pid;

	event->tid = (pid_t)pid_tgid;
	bpf_get_current_comm(&event->comm, sizeof(event->comm));

	event->user_stack_id = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
	event->kernel_stack_id = bpf_get_stackid(ctx, &stackmap, 0);

	void* thread_state_current = (void*)0;
	bpf_probe_read(&thread_state_current,
	sizeof(thread_state_current),
	(void*)(long)pidData->current_state_addr);

	struct task_struct* task = (struct task_struct*)bpf_get_current_task();
	void* tls_base = (void*)task;

	void* thread_state = pidData->use_tls ? get_thread_state(tls_base, pidData)
	: thread_state_current;
	event->thread_current = thread_state == thread_state_current;

	if (pidData->use_tls) {
	uint64_t pthread_created;
	uint64_t pthread_self;
	bpf_probe_read(&pthread_self, sizeof(pthread_self), tls_base + 0x10);

	bpf_probe_read(&pthread_created,
	sizeof(pthread_created),
	thread_state + pidData->offsets.PyThreadState_thread);
	event->pthread_match = pthread_created == pthread_self;
	} else {
	event->pthread_match = 1;
	}

	if (event->pthread_match \|\| !pidData->use_tls) {
	void* frame_ptr;
	FrameData frame;
	Symbol sym = {};
	int cur_cpu = bpf_get_smp_processor_id();

	bpf_probe_read(&frame_ptr,
	sizeof(frame_ptr),
	thread_state + pidData->offsets.PyThreadState_frame);

	int32_t* symbol_counter = bpf_map_lookup_elem(&symbolmap, &sym);
	if (symbol_counter == NULL)
	return 0;
	#ifdef NO_UNROLL
	#pragma clang loop unroll(disable)
	#else
	#pragma clang loop unroll(full)
	#endif
	/* Unwind python stack */
	for (int i = 0; i < STACK_MAX_LEN; ++i) {
	if (frame_ptr && get_frame_data(frame_ptr, pidData, &frame, &sym)) {
	int32_t new_symbol_id = symbol_counter 64 + cur_cpu;
	int32_t *symbol_id = bpf_map_lookup_elem(&symbolmap, &sym);
	if (!symbol_id) {
	bpf_map_update_elem(&symbolmap, &sym, &zero, 0);
	symbol_id = bpf_map_lookup_elem(&symbolmap, &sym);
	if (!symbol_id)
	return 0;
	}
	if (*symbol_id == new_symbol_id)
	(*symbol_counter)++;
	event->stack[i] = *symbol_id;
	event->stack_len = i + 1;
	frame_ptr = frame.f_back;
	}
	}
	event->stack_complete = frame_ptr == NULL;
	} else {
	event->stack_complete = 1;
	}

	Stats* stats = bpf_map_lookup_elem(&statsmap, &zero);
	if (stats)
	stats->success++;

	event->has_meta = 0;
	bpf_perf_event_output(ctx, &perfmap, 0, event, offsetof(Event, metadata));
	return 0;
	}

	SEC("raw_tracepoint/kfree_skb")
	int on_event(struct pt_regs* ctx)
	{
	int i, ret = 0;
	ret \|= __on_event(ctx);
	ret \|= __on_event(ctx);
	ret \|= __on_event(ctx);
	ret \|= __on_event(ctx);
	ret \|= __on_event(ctx);
	return ret;
	}

	char _license[] SEC("license") = "GPL";